Grasso Screw compressors Types C ... XF Product Information - GEA ...

Grasso Screw compressors 

Types C ... XF 

Product Information 

(Translation of the original text) 

GEA Refrigeration Germany GmbH _101011_pi_sc_gbr_2_.doc 1 

23.03.2012

PRODUCT INFORMATION 

GRASSO SCREW COMPRESSORS 


COPYRIGHT 

All Rights reserved. 

No part of this publication may be copied or published 

by means of printing, photocopying, microfilm 

or otherwise without prior written consent of 

• GEA Refrigeration Germany GmbH 

herein after called manufacturer. This restriction 

also applies to the corresponding drawings and diagrams. 

LEGAL NOTICE 

This documentation has been written in all conscience. 

However, the manufacturer cannot be held 

responsible, neither for any errors occurring in this 

documentation nor for their consequences. 

2 _101011_pi_sc_gbr_2_.doc GEA Refrigeration Germany GmbH 

23.03.2012




SYMBOLS USED IN THIS MANUAL 

Danger! 

Stands for an immediate danger 

which leads to heavy physical injuries 

or to the death. 

Warning! 

Stands for a possibly dangerous situation 

which leads to heavy physical 

injuries or to the death. 

Caution! 

Stands for a possibly dangerous situation 

which could lead to light physical 

injuries or to damages to property. 

Hint! 

Stands for an important tip whose 

attention is important for the designated 

use and function of the device. 


23.03.2012




TABLE OF CONTENTS 

1 INTRODUCTION ............................................................................................................................ 8 

1.1 OPERATIONAL AREA ...................................................................................................... 8 

1.2 PRODUCT RANGE ........................................................................................................... 8 

1.3 TECHNICAL FEATURES ................................................................................................ 10 

2 PRODUCT OVERVIEW ............................................................................................................... 11 

3 COMPRESSOR DESCRIPTION .................................................................................................. 12 

3.1 Product description / Product code .................................................................................. 12 

4 COMPRESSOR DESIGN CRITERIA ........................................................................................... 17 

5 OPERATING LIMITS.................................................................................................................... 19 

6 MAIN DIMENSIONS..................................................................................................................... 24 

6.1 SERIES SH; TYPE C, D .................................................................................................. 24 

6.2 SERIES SH; TYPE E, G .................................................................................................. 28 

6.3 SERIES MC; TYPE H, L, M, N ......................................................................................... 32 

6.4 SERIES LT; TYPE P, R, S, T, V, W, Y, Z, XA, XB, XC, XD .............................................. 34 

6.5 SERIES LT; TYPE XE, XF ............................................................................................... 44 

7 INSTALLATION CONDITIONS, VIBRATION, SOUND ................................................................. 46 

8 COUPLING REQUIREMENTS ..................................................................................................... 49 

9 COUPLING HOUSING ................................................................................................................. 51 

9.1 COUPLING HOUSING WITH COUPLING (standard), TYPES C, D, E, G ....................... 51 

9.2 COUPLING HOUSING WITH COUPLING (USA), TYPES C, D, E, G .............................. 54 

10 CONDITIONS FOR REFRIGERANT CONNECTIONS ................................................................. 55 

11 CONDITIONS FOR LUBRICATING OIL CONNECTIONS ............................................................ 56 

12 ELECTRIC CONNECTIONS ........................................................................................................ 59 

13 STARTING CONDITIONS ............................................................................................................ 62 

13.1 SH and MC series............................................................................................................ 62 

13.2 LT SERIES ...................................................................................................................... 64 

14 OPERATION MONITORING ........................................................................................................ 66 

15 LUBRICATING OILS FOR SCREW COMPRESSORS ................................................................. 67 

15.1 Lubricating oil selection list .............................................................................................. 67 

15.2 HINTS FOR SELECTION OF REFRIGERATION OIL ...................................................... 77 

16 SCHEMATIC DIAGRAM, CONNECTIONS .................................................................................. 81 

16.1 FRAME SIZES C, D, E, G ................................................................................................ 82 

16.2 FRAME SIZES H, L, M, N ................................................................................................ 88 

16.3 SIZES P; R, S, T; V, W, Y ................................................................................................ 95 

16.4 SIZES Z, XA XB, XC, XD; XE, XF .................................................................................. 103 


23.03.2012




TABLE OF FIGURES 

fig. 1: Product Overview / Fields of Applications ................................ Fehler! Textmarke nicht definiert. 

fig. 2: Compressor nomenclature ...................................................... Fehler! Textmarke nicht definiert. 

fig. 3: Nomenclature .......................................................................... Fehler! Textmarke nicht definiert. 

fig. 4: Standard design Type C, D ........................................................................................................ 24 

fig. 5: USA-Design, Type C, D ............................................................................................................. 26 

fig. 6: Standard design Type E, G ........................................................................................................ 28 

fig. 7: USA-Design, Type E, G ............................................................................................................. 30 

fig. 8: Types H, L .................................................................................................................................. 32 

fig. 9: Types M, N ................................................................................................................................. 32 

fig. 10: Type P ...................................................................................................................................... 34 

fig. 11: Types R, S, T ........................................................................................................................... 36 

fig. 12: compressor types V, W, Y ........................................................................................................ 38 

fig. 13: compressor types Z, XA ........................................................................................................... 40 

fig. 14: compressor types XB, XC, XD .................................................................................................. 42 

fig. 15: Types XE, XF ........................................................................................................................... 44 

fig. 16: spherical washer-conical seat-combination .............................................................................. 46 

fig. 17: Position sensor connection diagram ......................................................................................... 59 

fig. 18: Valve block 4 ............................................................................................................................ 60 

fig. 19: Valve block 2 ............................................................................................................................ 60 

fig. 20: Connection diagram directional control valve block capacity control ......................................... 61 

fig. 21: Connection diagram directional control valve block Vi position ................................................. 61 

fig. 22: Internal oil passage, Types C, D, E, G ...................................................................................... 82 

fig. 23: Connections male rotor side, Types C, D, E, G ........................................................................ 83 

fig. 24: Connections discharge end, Types C, D, E, G ......................................................................... 83 

fig. 25: Connections female rotor side, Types C, D, E, G ..................................................................... 84 

fig. 26: Oil management versions, Types C, D, E, G ............................................................................ 87 

fig. 27: Internal oil passage (compressor sectional view), Types H, L, M, N. ........................................ 88 

fig. 28: Internal oil passage, Types H, L, M, N ...................................................................................... 89 

fig. 29: Connections sizes H, L ............................................................................................................. 90 

fig. 30: Connection, sizes M, N............................................................................................................. 92 

fig. 31: Connections, Type P ................................................................................................................ 96 

fig. 32: Connections, Type R, S, T ....................................................................................................... 98 

fig. 33: Connections, Type V, W, Y .................................................................................................... 100 

fig. 34: Type Z .................................................................................................................................... 104 

fig. 35: Type XA ................................................................................................................................. 106 

fig. 36: Types XB, XC, XD .................................................................................................................. 108 

fig. 37: Types XE, XF ......................................................................................................................... 110 


23.03.2012




INTRODUCTION 

1 INTRODUCTION 

This product information specifically describes screw compressors used in the refrigeration, air conditioning and 

heat pump technology. 

For product information for other applications please contact GEA Refrigeration Germany GmbH. 

1.1 OPERATIONAL AREA 

The screw compressors are oil injected dual rotor 

positive displacement machines. 

The machines are available as standard refrigeration 

compressors for single-stage operation, as boosters 

as well as heat pump compressors. 

The compressors can be applied among other things 

for operational areas: In cold stores, in food industry 

(slaughter houses, breweries, dairies, food- and 

vegetable processing), air conditioning, chemical 

and petrochemical industries, refrigerating, cooling 

and air conditioning plants onboard ships as well as 

heat pump operation. 

The refrigerants NH 3 , R744 (CO 2 ), R290 (propane), 

R1270 (propylene), R22, R23, R134a, R404A, 

R407C, R410A, R507 and refrigerant mixtures can 

be used up to a discharge pressure of 52 bar. 

For these refrigerants, lubricating oil is chosen in 

accordance with lubricating oil information for screw 

compressors (Chapter 15, page 67). 

The compressors are suitable as gas compressors 

in various operational areas e.g. process gas, natural 

gas or helium compression. 

The compressors are generally run directly with an 

electrical motor via a flexible coupling. Based on the 

size they are suitable for speeds between 960 min -1 

and 6000 min -1 . The compressor can also have 

combustion or gas engines as drives. 

1.2 PRODUCT RANGE 

The Grasso range of screw compressors currently 

includes 24 models, which are divided into the three 

ranges SH, MC, LT and the models AC and MC, 

which have suction volume of up to 8560 m³/h (2940 

min -1 ). Compressors of the same size can have varying 

suction volumes thanks to a special interior design. 

The classification of the compressor sizes and 

suction volumes can be found based on type descriptions 

in the data sheet (Chapter 3, page 12). 

The AC size is especially designed for use as a 

high-pressure heat pump using CO 2 as a refrigerant. 

The series SH include the sizes C, D, E and G. 

The series MC include the sizes H, L, M and N. 

The LT series has 14 sizes P, R, S, T, V, W, Y, Z, 

XA, XB, XC, XD, XE and XF. 

The series differ primarily based on the integration 

level of functional elements in the oil and refrigerant 

lines. 

The screw compressors in the series SH (Small, 

High-Integrated) come available with suction and 

pressure side check valves, suction filters, oil filters, 

oil management systems, attached oil pumps, couplings 

and coupling housing with centering flange for 

flange motors, as well as integrated solenoid valve 

combination for capacity control and setting the volume 

ratio (Vi). 

The components of series MC – Medium-Compactscrew 

compressors - include a flanged oil pump, a 

check valve on the suction side, suction filter and 

attached solenoid valve combinations for capacity 

control and Vi adjustment. 

Screw compressors of type CM have a central oil 

supply and flanged solenoid valves for Vi adjustment. 

Screw compressors of type CM need external 

filters and valves. Screw compressors of type CM 

are currently only available in conjunction with a 

"BluAstrum"-Chiller. 

Screw compressors in the LT series have an integrated 

solenoid valve combination for capacity control 

and adjusting the inner volume ratio (Vi). Screw 

compressors in the LT series need external filters 

and valves as well as compartmentalized oil intake 

systems. 

The screw compressors in the SH, MC and LT series 

have an infinitely adjustable capacity control and 

may be equipped with self-regulating, alterable inner 

volume ratios (Vi) (parallel slides, system PS, for 

series SH and MC; tandem slide, System TS, in the 

LT series). Compressors with set installed volume 

ratios Vi are available in sizes of 1.8 to 5.5 depending 

on the compressor size. The Vi-value in compressor 

selection program is calculated for the specific 

usage. The specific designs and the necessary 

equipment of the compressor are specified during 

order processing. 

Screw compressors of type CM offer infinitely adjustable 

capacity control using speed control on the 

drive motor. A slider system adjusts the inner volume 

ratio. The Vi-value in compressor selection 


23.03.2012




INTRODUCTION 

program is calculated for the specific usage. The 

specific designs and the necessary equipment of the 

compressor are specified during order processing. 

Screw compressors in the AC size are designed for 

special use as heat pump compressors with CO 2 

and have a maximum pressure of up to 130 bar. 

These compressors offer infinitely adjustable capacity 

control using speed control on the drive motor and 

a fixed inner volume ratio (Vi). 

All types are equipped with an economizer connection 

and have connections to refrigerant injection as 

well as the reverse oil flow from the plant system. 

Compressors for high pressure conditions are 

equipped for self-controlling systems with low pulse 

partial load operations. 

All compressors have prepared mating surfaces to 

install sensors for vibration measurement. The LT 

series compressors may also be equipped with sensors 

for monitoring bearing temperatures as well as 

monitoring of the axial rotor position. 

Grasso screw compressors are characterized 

amongst other by a compact design, by their reliability, 

by the application of high quality components 

and by its maintainability. 

Before delivery, each compressor is subjected to a 

test run with nitrogen in the pressure range of the 

future application which is proven by a factory approval 

certificate accompanying each compressor. 

On request, a certificate of acknowledged classification 

societies, e.g. TÜV, Lloyds Register of Shipping, 

Germanischer Lloyd, Norske Veritas, Bureau Veritas, 

will be provided. 

The solenoid valve and position sensors for capacity 

controls and Vi adjustment may be delivered with 

UL/CSA certification. 

The compressors are available in explosion-proof 

execution. 

A comprehensive quality assurance system based 

on DIN ISO 9001 and comprising all stages from 

design/ development, manufacturing, assembly and 

testing through to customer service guarantees an 

excellent quality of the Grasso Screw compressors. 

The compressors are delivered without oil. 

All connections are sealed and the compressors are 

filled with dry nitrogen (0.5 bar over pressure). Every 

compressor comes with installation instructions and 

safety instructions, notes on the operating principles 

and installation, maintenance and repairs as well as 

the scope of tools and replacement parts. 


23.03.2012




INTRODUCTION; TECHNICAL FEATURES 

1.3 TECHNICAL FEATURES 

Rotors 

The rotors are made from machined or forged tool 

steel. They are designed according to low energy 

consumption criteria (patented profile with optimized 

main dimensions). The primary rotor is driven by the 

motor, whereas the secondary rotor is directly driven 

by the primary rotor by means of a thin oil film. 

The drive shaft end is cylindrical and does not have 

a keyway. To have a compressor in accordance with 

ATEX guidelines the end of the drive shaft needs to 

have a cylindrical exterior with a keyway. 

Casing 

The casings for operating pressures up to 28 bar are 

made of laminar grey cast iron. The casings for operating 

pressures up to 52 bar are made of spheroidal 

cast iron. Compressors for special requirements 

in accordance with API 619 are available with a cast 

steel casing. 

Bearings 

The compressors of series AC, SH, MC and of type 

CM have complete anti-friction bearings. Highperformance 

cylindrical ball bearings for absorbing 

radial forces and angular contact ball bearings for 

absorbing axial forces provide for a theoretical live of 

up to 100.000 operational hours. A hydraulically 

loaded balance piston reduces the force on the axial 

ball bearings and increases their lifespan. The compressors 

in the LT series use the low-friction sleeve 

bearings on a thin oil film to carry the radial forces in 

rotor shafts with no contact and the angular contact 

ball bearings absorb the axial forces. 

Position indication 

For position indication of the hydraulic systems of 

the capacity control and the Vi adjustment, a hermetic 

path sensor is used which provides an output signal 

between 4 and 20 mA. 

In compressor version in line with ATEX guidelines 

and the required safety levels EEx ia IIC T4 or EEx 

ib IIC T4, one of the position sensors from the manufacturer 

shall be installed with zener diode. 

For screw compressors that operate in concert with 

additional compressors and have a check valve installed, 

the adjustment path for the control slide in 

the capacity control shall be reduced with a stop 

sleeve or through parameters in the compressor 

control system with a minim control slide settings 

while the compressor is operating. A stop sleeve 

limit the min. position of the slide and guarantees a 

minimum flow rate for the compressor. 

Optional equipment specifications 

In addition to the specifications listed above the 

compressors may also be equipped with other components. 

– Doubly-working shaft seal, if the requirements in 

API 619 are met. 

– Axial slide bearings to fulfill API 619. 

– Bearing temperature monitoring for the slide 

bearings. 

– Rotor positioning system for monitoring the axial 

position of the rotors. 

Shaft sealing 

The oil blocking shaft seal with a rotating and a fixed 

ring is responsible for sealing off the drive for the 

male rotor shaft. Depending on the anticipated wear 

on the shaft seal, various material pairings can be 

used. The seal is designed to relieve load variations 

whilst containing the oil charge and the thin oil film 

between the rings results in a long service life. For 

special cases of application the compressors can be 

equipped with one doubly working axial shaft seal. 

Capacity control 

Through an infinitely variable control slide with a 

hydraulic mechanism the swept volume can be adjusted 

from 100% to a minimal value. Compressors 

with a variable volume ratio operate according to a 

system of combined Vi partial-load control. 


23.03.2012




PRODUCT OVERVIEW 

2 PRODUCT OVERVIEW 

fig. 1: 

Product Overview / Fields of Applications 

Hint! 

For model designation please refer to Chapter 3, page 12. 


23.03.2012




COMPRESSOR DESCRIPTION 

3 COMPRESSOR DESCRIPTION 

3.1 Product description / Product code 

Nomenclature 

fig. 2: 

Compressor nomenclature 

* applies only to specific Grasso-compressors 

1. Compressor frame size 

The 24 available frame sizes are described by the following letters. 

Series 

Compressor frame size 

SH C D E G 

MC H L M N 

LT 

P 

Z 

R 

XA 

S 

XB 

T 

XC 

V 

XD 

W 

XE 

Y 

XF 

AC 

AC 

CM 


23.03.2012





2. Type of capacity control 

applies only to specific Grasso-compressors 

S: Speed controlled capacity. 

The compressor is run using a speed-controlled machine (capacity control is carried out using speed). 

The compressor (only) has a Vi slide. 

3. Application Range 

R: Refrigeration "Refrigeration" 

P: Power generation "Power Generation" 

A: API 619-Requirements "API 619 Standard" 

E 

Expander operation 

(energy recovery) 

"Expander Operation" 

(Energy Recovery) 


23.03.2012





4. Swept volume letter 

The swept volume letter describes the theoretical swept volume flow of the compressor and will be described with 

letters. The letters are identical with the letters of the compressor frame sizes. 

The frame size letter and the swept volume letter are the same in standard execution. 

If not, the particular frame size has a reduced suction volume flow. This is special compressor design and considered 

as a „heavy duty execution”. 

Swept volume letter 

Suction volume flow 

in m³/h *) Swept volume letter 

Suction volume flow 

in m³/h *) 

A 155 **) P 805 

C 231 R 1040 

D 265 S 1290 

E 321 T 1460 

G 372 V 1740 

W 1990 

H 471 Y 2390 

L 544 Z 2748 

M 690 XA 3250 

N 860 XB 4150 

XC 4900 

XD 5800 

XE 7170 

XF 8560 

*) at 2940min -1 (50 Hz-Netz); multiply the value by 1.2 for 60 Hz. Not for flow volume "A". 

**) only for series AC, at 6000 min -1 


23.03.2012





5. Vi Identification number 

The Vi Identification number describes the inner volume ratio of the screw compressor. 

Vi fixed - Standard identification numbers 

Vi 1.5 **) 1.8 2.0 2.2 2.6 3.0 3.6 4.8 5.5 

Code 15 **) 18 20 22 26 30 36 48 55 

**) only for series AC 

Vi variable - Standard identification numbers 

Series SH MC LT 

Vi 2.6/4.0 3.2/4.8 2.6/4.8 2.6...5.5 * 2.6...5.5 1.4...2.7 ** 1.8...5.0 ** 1.8...3.0 2.2...4.0 2.6...5.5 

Code 2640 3248 2648 2655 * 2655 1427 ** 1850 ** 1830 2240 2655 

* only available for type "G" 

** only available for speed controlled compressors (e.g. CMR-M1427R-28, MSR-M1427R-28) 

6. Compressor design 

A: Axial bearings in slide-bearing design. 

B: Booster. Standard-Axial bearing design, without balance piston. 

C: Standard-Axial bearing design, with smaller balance piston. 

D: Axial bearing in Triax design, with smaller balance piston 

E: Axial bearing in Triax design, without balance piston 

R: Axial bearing in Tandem design 

S: Standard-Axial bearing design, Standard balance piston. 

T: Axial bearing in Triax design, Standard balance piston 

7. Maximum allowable pressure 

The maximum allowable pressure is based on DIN EN 378-1 and describes the limits for operating pressure, 

which may not be exceeded at the compressor during operations or after shut down of the plant. In addition, the 

maximum allowable loads on the drive shafts and bearings shall also be taken into account, which then result in 

the operating conditions for the compressor (suction pressure, discharge pressure). The maximum allowable 

pressure is marked on the nameplate of the compressor. 

The compressors are available in standard versions for three maximum allowable pressures: 

- 28 bar.g 

- 52 bar.g 

- 130 bar, only for size "AC" 

Differing from the standard versions a different maximum allowable pressure can be agreed depending on the 

application. 


23.03.2012





Summary 

Variable values 

AC 

A 15 

130 

C, D, E, G 

H, L, M, N 

S 

CM 

P, R, S, T 

V, W, Y, Z, XA 

A 

E 

P 

R 

M 

P, R, S, T 

V, W, Y, Z, XA 

XB, XC, XD 

XE, XF 

C, D, E, G 

H, L, M, N 18, 20 

XB, XC, XD 


22, 26, 30 

36, 48, 55 

1427, 1850 

2640, 3248, 2648 

1830, 2240, 2655 

A 

B 

C 

D 

E 

R 

S 

T 

28 

52 

fig. 3: 

Nomenclature 

* applies only to specific Grasso-compressors 


23.03.2012




COMPRESSOR DESIGN CRITERIA 

4 COMPRESSOR DESIGN CRITERIA 

Compressor 

Type 

ZM/ZF 

Theoretical 

Swept volume 

Vi- 

Adjustment 

Compressorequipment 

Bearings 

radial/axial 

Oil supply 

Drivemotor 

(0) (1) (2) (3) (4) (5) (6) 

AC 155 (7) 5/6 None B W/W M F 

C 231 5/6 PS 2 D W/W O/M F 

D 265 5/6 PS 2 D W/W O/M F 

E 321 5/6 PS 2 D W/W O/M F 

G 372 5/6 PS 2 D W/W O/M F 

H 471 5/6 PS 0 C W/W O/M E 

L 544 5/6 PS 0 C W/W O/M E 

M 690 5/6 PS 0 C W/W O/M E 

CM 690 5/6 ES 0 E W/W N F 

N 860 5/6 PS 0 C W/W O/M E 

P 805 5/6 TS 0 A; B G/W M E 

R 1040 5/6 TS 0 A; B G/W M E 

S 1290 5/6 TS 0 A; B G/W M E 

T 1460 5/6 TS 0 A; B G/W M E 

V 1740 5/6 TS 0 A; B G/W M E 

W 1990 5/6 TS 0 A; B G/W M E 

Y 2390 5/6 TS 0 A; B G/W M E 

Z 2748 5/6 TS 0 A; B G/W M E 

XA 3250 5/6 TS 0 A; B G/W M E 

XB 4150 5/6 TS 0 A; B G/W M E 

XC 4900 5/6 TS 0 A; B G/W M E 

XD 5800 5/6 TS 0 A; B G/W M E 

XE 7170 5/6 TS 0 A; B G/W M E 

XF 8560 5/6 TS 0 A; B G/W M E 


23.03.2012




COMPRESSOR DESIGN CRITERIA 

(0) at 2940 min-1 (50 Hz-mains; for 60 Hz multiply by 1.2 

The values of the swept volume flow refer to the standard design of the compressor, 

when the frame size and the swept volume have the identical letter (see data sheet 

model designation )Chapter 3, page 12 

(1) ZM numbers of lobes, male rotor 

ZF 

numbers of lobes, female rotor 

(2) PS parallel slide system, PS 0 : infinitely variable Vi adjustment 

PS 2 : 2-stage Vi- adjustment 

TS tandem slide system TS 0 : infinitely variable Vi adjustment 

ES single slide ES 0 : infinitely variable Vi adjustment 

(3) A standard configuration with solenoid valve blocks for capacity and Vi-adjustment of the 

compressor; 

B 

C 

D 

E 

special design without solenoid valve blocks, 

solenoid valve blocks, suction filter *) , check valve on the suction side *) , oil pump on the 

compressor *) ; 

Solenoid valve blocks, suction filter *) , check valves (suction and pressure side) *) , oil 

pump on compressor *) *) **) 

, overflow valve 

flanged solenoid valves for Vi-adjustment 

(4) W antifriction bearings 

G 

sleeve bearings 

(5) O compressor operation with flanged oil pump for capacity control 

M 

N 

compressor operation with external oil pump 

compressor operates without oil pump 

(6) F flange motor 

E 

motor and compressor installed separately 

(7) at 6000 min -1 

with *) labeled components are optional. For compressors without oil pump on the compressor, an external oil 

pump is needed. 

**) The overflow valve operates based on the differential pressure. Overflow valves are available for various pressure 

differentials. The selection is made independent of the suction pressure and permitted discharge pressure of 

each operation. 


23.03.2012




OPERATING LIMITS 

5 OPERATING LIMITS 

The screw compressors can be operated under the most varied operating conditions within the given limits of 

application according to the requirements involved. The limits of application listed below for the screw compressors 

are based on the operational principle of the screw compressor and thermodynamic ratios and are based on 

practical operating conditions and design. The tabulated data apply for single, two-stage and heat pump operation. 

Depending on the compressor the manufacturer selected, the specific operating conditions limitations may 

occur within the parameters in the table. 

Hint! 

For specific operations the selection and evaluation will takes place in the manufacturer's 

compressor selection program "KAB COM" or "GUD". 

Caution! 

To avoid "zero flow" in the compressor, which can damage the compressor, the minimum control 

slide positions in the manufacturer's compressor selection programs "KAB COM" or 

"GUD" need to be adhered to. 

"Minimal control slide position % accepted start." 

If the value entered is "> 0", then a limitation of the control slide path has to be done put in 

place in coordination with the manufacturer. The path limitation can be set created mechanically 

with a stop sleeve or by installing virtual controls (virtual stop sleeve) on the compressor. 

Maximum permitted pressure p bar g. max. 

≤28 bar 

or 

≤52 bar 

Pressure ratio (p / p 0 ) π - min. >1.5 

Pressure difference (p - p 0 ) Δp bar min. >0.8 

Suction temperature (compressor inlet) t 0h °C min. > - 60 

Discharge temperature (compressor outlet) t e °C max.





Compressor frame size P R/ S/ T V/ W /Y Z/ XA 

XB/ XC/ 

XD 

XE/ XF 

Max. driving power (kW) 

50 Hz 

60 Hz 

530 

640 

530 

640 

1250 

1500 

1250 

1500 

1800 

2160 

3000 

3600 

Max nominal torque **) Nm 1700 1700 4000 4000 5750 9500 

Max. allowable speeds 

(rpm) 

min -1 3600 3600 3600 3600 3600 3600 

minimum speed limits min -1 1500 1500 1500 1500 1500 1500 

*) 

In the size E/G and M/N the compressors have different drive shaft ends. 

**) When running the compressor the maximum torque falls by 25% as opposed to electrical drives. 

The nominal maximum driving power is the upper limit determined by the shaft end. For reasons of bearing loads 

mentioned maximum driving power will not be achieved by all delivery flow sizes available within a compressor 

type. The examination is done in the compressor selection program. 

For more information see chapter regarding compressor model designation. 


23.03.2012





Hint! 

All of the following requirements must be observed! 

Compressors for a discharge pressure up to 52 bar are equipped with housings made of a material of 

higher strength and are fitted with special components. 

Minimal overheating at suction side: "Wet" operation to be avoided. 

For Δ p = p - p o ≤ 4 bar an external oil pump to be taken for frame sizes C to N. 

For Δ p = p - p o ≤ 4 bar for compressors in the LT with Vi settings range a functional oil pressure of p oil ≥ 

p 0 + 4,5 bar needs to be maintained. 

For π ≥ 8 gas vibration protection is required. 

For CO 2 usage the use of a completely electrified oil pump for injection and function oil needs to be 

checked in all types of compressors depending on the operating conditions; in types Z to XF a partially 

electrified oil pump or completely electrified oil pump can be examined for the function oil depending on 

the operating conditions. 

The discharge temperature t e must be 10 K above the condensing temperature (t e ≥ t c + 10 K). 

Due to the solubility of refrigerant in the oil following applies: 

• for Ammonia: 

– t e ≥ t oil + 5 K; 

– t e ≥ t oil + 10 K, when using a PAG oil (dissolving of refrigerant in the oil). 

• For R22, R134a, R404A, R407C, R410A, R507, CO 2 , natural gas, carbohydrate molecules: 

– t e ≥ t oil + 10 K, when refrigerant is dissolved in the oil. 

→ 

To determine the permitted difference between the discharge temperature (t e ) and oil intake temperature 

(t oil ) the set viscosity and the solubility diagram for the refrigerant-oil pair from the lubrication 

supplier need to be adhered to. 

If oil viscosity is ≥7...the 70 cSt needs to provided for the oil solubility. Take into account the drop in viscosity 

due to refrigerant dissolved in the oil! 

Limits for temperature differences will be considered in compressor selection programs. 

The oil temperature at the compressor inlet must be at least 18°C, the oil must be preheated if necessary. 

The rate of temperature change at compressor suction side should not exceed 0.1 K/s. 

Direction of rotation: view of compressor’s driving shaft: clockwise. 

For individual cases outside the permitted speed coordination needs to made with the manufacturer. 

p 

p 0 

Maximum permitted pressure 

Suction pressure 

Δp Pressure difference (p - p 0 ) 

π Pressure ratio (p / p 0 ) 

t 0h 

t e 

t c 

t oil 

Suction temperature (compressor inlet) 

Discharge temperature (compressor outlet) 

Condensing temperature 

oil inlet temperature into the compressor 


23.03.2012





Notes: 

1. During tests of a certain application case, all the conditions specified in the table must be considered and 

adhered to. 

2. Should the given limits not be adhered to in individual cases, then the manufacturer needs to be contacted. 

3. In addition to the operation limits listed the operating conditions relevant to the compressor type need to be 

taken into account (e.g. start routine, oil pressure, oil quantity etc.) 

4. Depending on the requirements of refrigeration economizer operation proceeds between the 100% and approx. 

70% control slide positions. 

5. If R134a is used as a refrigerant with liquefaction temperature of > 60 °C the manufacturer needs to be 

contacted. 


23.03.2012




MAIN DIMENSIONS 


23.03.2012





6 MAIN DIMENSIONS 

6.1 SERIES SH; TYPE C, D 

Standard design 

fig. 4: 

Standard design Type C, D 

Compressor with coupling housing and coupling *) 

Coupling module 

Main dimensions 

A; B C; G D H K E; F 

l 1 (overall length) (mm) 914 [944] 944 [974] 

l 2 (mm) 351 381 

l 3 (mm) 381 [411] 411 [441] 

b 1 (overall width) (mm) 544 660 588 

h 1 (overall height) (mm) 492 510 615 560 

d 

diameter 

drive shaft 

(mm) 

40 h6 

d 1) 

(centering 

flange-Ø) 

(mm) 250 300 350 550 450 

d 2) (hole circle-Ø) (mm) 300 350 400 600 500 


23.03.2012






Coupling module 


A; B C; G D H K E; F 

m (thread size) M16 M20 M16 

n 

(number of 

bolts) 

4 8 

suction side DN 80 

Port 

discharge side DN 65 

Charge (economizer) 

DN 25 

Coolant injection DN 8 

approx. weight, 

max. 

(kg) 282 [293] 292 [303] 300 [310] 320 [330] 352 [362] 313 [324] 

[...] - Values used for compressor type D 

*) refer Section 9.1, page 51, Coupling housing with coupling 


23.03.2012





USA-Design 

fig. 5: 

USA-Design, Type C, D 

Compressor with coupling housing and coupling 


Booster 

High stage 

High stage 

Special design 

Order No. 2501650 2501750 2501740 

L1 (overall length) mm 944 [974] 936 [966] 

L2 mm 381 373 

L3 mm 381 383 [413] 

B1 (overall width) mm 526 576 

H1 (overall height) mm 510 560 

D 

diameter 

drive shaft 

mm 

40 h6 

D1 

(centering flange 

Ø) 

mm 266.7 317.5 355.6 

D2 (hole circle Ø) mm 228.6 279.4 355.6 

m (thread size) mm 15.5 17.5 

n (number of bolts) 4 8 


23.03.2012







Booster 

High stage 

High stage 


Order No. 2501650 2501750 2501740 


Port 


Load (economizer) 

DN 25 



max. 

(kg) 328 [338] 364 [374] 368 [378] 

[...] - Values used for compressor type D 


23.03.2012




MAIN DIMENSIONS; SERIES SH; TYPE E, G 

6.2 SERIES SH; TYPE E, G 

Standard design 

fig. 6: 

Standard design Type E, G 



M; N P; V R W S; T U 

l 1 (overall length) (mm) 1000 [1030] 1030 [1060] 

l 2 (mm) 362 392 

l 3 (mm) 432 [461] 462 [491] 

b 1 (overall width) (mm) 620 675 

h 1 (overall height) (mm) 595 615 670 

d 

diameter 

drive shaft 

(mm) 

Compressor for 28 bar max. pressure permitted : 40 h6 

Compressor for 52 bar max. pressure permitted : 45 h6 

d 1) 

(centering 

flange-Ø) 

(mm) 250 300 350 450 550 


23.03.2012







M; N P; V R W S; T U 

d 2) (hole circle-Ø) (mm) 300 350 400 500 600 

m (thread size) M16 M20 

n 

(number of 

bolts) 

4 8 


Port 



DN 25 



max. 

(kg) 412 [423] 418 [429] 423 [433] 442 [452] 438 [448] 461 [472] 

[...] - Values apply to type G compressor 

*) refer Section 9.1, page 51, Coupling housing with coupling 


23.03.2012





USA-Design 

fig. 7: 

USA-Design, Type E, G 



Booster 

High stage 

High stage 


Order No. 2501660 2501770 2501760 

L1 (overall length) mm 1030 [1060] 1023 [1052] 

L2 mm 392 384 

L3 mm 395 [424] 397 [426] 

B1 (overall width) mm 545 595 

H1 (overall height) mm 510 560 

D 

diameter 

drive shaft 

mm 

40 h6 

D1 

(centering flange 

Ø) 

mm 266.7 317.5 406.7 

D2 (hole circle Ø) mm 228.6 279.4 355.6 

m (thread size) mm 15.5 17.5 

n (number of bolts) 4 8 


23.03.2012







Booster 

High stage 

High stage 


Order No. 2501660 2501770 2501760 


Port 



DN 25 

liquid injection DN 8 


max. 

(kg) 451 [461] 509 [519] 513 [523] 

[...] - Values apply to type G compressor 


23.03.2012




MAIN DIMENSIONS; SERIES MC; TYPE H, L, M, N 

6.3 SERIES MC; TYPE H, L, M, N 

fig. 8: 

Types H, L 

fig. 9: 

Types M, N 


23.03.2012




MAIN DIMENSIONS; SERIES MC; TYPE H, L, M, N 

Type 

H L M N 

theoretical swept volume (m 3 /h) at 2940 rpm 

Main dimensions 471 544 690 860 

b1 425 510 

b2 350 425 

b3 109 138 

b4 132 150 

d 

50 h6 

50 h6 (28 bar.g) 

60 h6 (52 bar.g) 

dm 18 22 

h1 537 646 

h2 215 270 

h3 36 50 

h4 23 26 

l1 931 967 1094 1145 

l2 350 386 406 457 

l3 165 219 

l4 249 296 

l5 219 260 

l6 60 55 

l7 *) 75 95 

suction side DN 125 DN 150 

Port 

discharge 

side 

Charge 

(economizer) 

DN 80 DN 100 

DN 32 DN 40 

approx. weight, max. (kg) 366 381 660 690 

*) Note should be made of the coupling's centrifugal area. 


23.03.2012




MAIN DIMENSIONS; SERIES LT; TYPE P, R, S, T, V, W, Y, Z, XA, XB, XC, XD 

6.4 SERIES LT; TYPE P, R, S, T, V, W, Y, Z, XA, XB, XC, XD 

fig. 10: Type P 

** position discharge connection 


23.03.2012





Type 

P 


Main dimensions 805 

b 1 600 

d 1) Ø 26 

d 2) 

Ø 60 h6 

e 1 375.4 

e 2 500 

e 3 160 

e 4 170 

e ** 5 250 

h 1 525 

h 2 290 

h 3 50 

h 4 110 

l 1 845 

l 1 T 865 

l 2 272 

l *) 3 (coupling nut) 95 

l 4 65 



Port 


HR 


NR 

DN 40 

- 


approx. weight, max. (kg) 598 

L 1 T: at maximum permitted pressure of 52 bar or on triax bearings (only male rotor side) see also Chapter 3, 

page 12, type description 

*) Centrifugal area of the coupling needs to be taken into account 


23.03.2012





fig. 11: Types R, S, T 



23.03.2012





Type 

R S T 


Main dimensions 1040 1290 1460 

b 1 660 

d 1) Ø 26 

d 2) 

Ø 60 h6 

e 1 419 485.5 525.5 

e 2 566 

e 3 176.3 

e 4 195 

e ** 5 283 

h 1 570 

h 2 330 

h 3 70 

h 4 130 

l 1 1001 1067 1107 

l 1 T 1020 1086 1126 

l 2 347 

l *) 3 (coupling seat) 110 

l 4 45 



Port 


HR 


NR 

DN 40 

- 


approx. weight, max. (kg) 890 960 1060 



*) The centrifugal area of the coupling needs to be taken into account. 


23.03.2012





fig. 12: compressor types V, W, Y 



23.03.2012





Type 

V W Y 



b 1 750 

d 1) Ø 26 

d 2) 

Ø 80 h6 

e 1 480.5 535.5 600.5 

e 2 600 

e 3 200 

e 4 200 

e ** 5 300 

h 1 670 

h 2 350 

h 3 70 

h 4 145 

l 1 1076 1130 1195 

l 1 T 1103 1158 1223 

l 2 360 


l 4 100 



Port 


HR 


NR 

DN 65 

DN 65 







23.03.2012





fig. 13: compressor types Z, XA 



23.03.2012





Type 

Z 

XA 


Main dimensions 2748 3250 

b 1 760 

d 1) Ø 26 

d 2) 

Ø 80 h6 

e 1 630 705 

e 2 660 

e 3 220.3 

e 4 230 

e ** 5 353 

h 1 700 

h 2 400 

h 3 70 

h 4 140 

l 1 1348 1423 

l 1 T 1368 1443 

l 2 435 


l 4 85 



Port 


HR 


NR 

DN 100 

DN 100 


approx. weight, max. (kg) 1670 1740 





23.03.2012





fig. 14: compressor types XB, XC, XD 



23.03.2012





Type 

XB XC XD 



b 1 900 

d 1) Ø 26 

d 2) 

Ø 90 h6 

e 1 650 717 800 

e 2 800 

e 3 272 

e 4 278 

e ** 5 443 

h 1 850 

h 2 495 

h 3 90 

h 4 195 

l 1 1410 1477 1560 

l 1 T 1447 1514 1597 

l 2 462 


l 4 120 



Port 


HR 


NR 

DN 125 

DN 125 







23.03.2012




MAIN DIMENSIONS; SERIES LT; TYPE XE, XF 

6.5 SERIES LT; TYPE XE, XF 

fig. 15: Types XE, XF 



23.03.2012




MAIN DIMENSIONS; SERIES LT; TYPE XE, XF 

Type 

XE 

XF 


Main dimensions 7170 8560 

b 1 1078 

d 1) 33 

d 2) 

Ø110 h6 

e 1 806 905 

e 2 800 

e 3 320 

e 4 255 

e ** 5 430 

h 1 980 

h 2 580 

h 3 95 

h 4 220 

l 1 1614 1713 

l 1 T 1672 1771 

l 2 500 

l *) 3 124 

l 4 130 



Port 


HR 


NR 

DN 150 

DN 150 

Oil injection DN 50 


approx. weight, max. (kg) 3500 3800 

L 1 T: for maximum pressure of 52 bar or triax bearings (only male rotor side), see also Chapter 3, page 12, type 

description. 



23.03.2012




INSTALLATION CONDITIONS, VIBRATION, SOUND 

7 INSTALLATION CONDITIONS, VIBRATION, SOUND 

INSTALLATION CONDITIONS: 

compressor mounting surface 

- overall evenness of mounting feet: 0.5 mm 

- shim thickness: ≥ 25 mm 

Ambient temperature -20°C ...50 °C *) 

*) All requirements described in chapter "Operating Limits" must be observed, Chapter 5, page 19. 

MOUNTING THE COMPRESSOR: 

Hint! 

For the mechanical mounting of the screw compressor on the 

compressor package an angle compensating support such as 

a spherical washer-conical seat-combination according to 

DIN 6319 has to be used, refer Figure 16, page 46. 

fig. 16: spherical washer-conical seat-combination 

1 spherical washer 

2 conical seat 

3 screw compressor foot 

4 compressor package (frame) 

VIBRATIONS: 

Main exciting frequencies [Hz] 

at 3000 rpm (3600 rpm) 

Frame size 

C, D, E, G, H, L, M, N, P, R, S, T, V, W, Y, Z, XA, XB, XC, XD, XE, XF 

f 1 50 (60) 

f 2 100 (120) 

f 3 250 (300) 

f 4 500 (600) 

Frame size 

Balance grade of rotors 

C, D, E, G H, L, M, N 

P, R, S, T, V, W, Y, Z, XA, 

XB, XC, XD, XE, XF 

Balance grade G (mm/s) 

acc. DIN ISO 1940 

G 6,3 G 4.0 G 2.5 


23.03.2012





Frame size 

Effective vibration velocity/ RMS [mm/s] 1) 

at frequency range between 10 and 1000 Hz 2) 

maximum emitted actual value 3) 

permissible 

limit value 4) 

1) according to DIN ISO 10816. 

C, D, E, G 2,0 4,0 

H, L, M, N 2,5 5,0 

P, R, S, T 3,0 6,0 

V, W, Y, Z, XA 3,5 7,0 

XB, XC, XD 4,0 8,0 

XE, XF 4,5 9,0 

2) at 2940 rpm (50 Hz power system); for 60 Hz power system multiply with 1,2. 

3) In case of steep installation of compressor. 

4) The installation of compressor as well as the design of frame and pipes of the package must be considered so 

that the limit values of vibration velocity do not overlap. 

CRITICAL TORSIONAL NATURAL FREQUENCY: 

(with consideration to the total mass moment of inertia of rotor pair) 

Frame size C-N P R S T V W Y 

Torsional frequency (Hz) 

more 

than 

200 

191,8 146,3 131,1 123,7 158,6 146,4 135,4 

Frame size Z XA XB XC XD XE XF 

Torsional frequency (Hz) 111,5 103,2 97,6 90,8 84,0 89,6 82,5 

SOUND POWER LEVEL: 

Frame size C D E G H L M N P R S T 

Sound power level 

L WA 

dB (A) 82 83 84 85 86 87 88 88 88 89 90 90 

Frame size V W Y Z XA XB XC XD XE XF 

Sound power level 

L WA 

dB (A) 91 91 92 93 94 96 97 98 99 100 


23.03.2012





PERMISSIBLE PIPING FORCES AND MOMENTS: 

Point of application 

Frame size 

C, D, E, G H, L, M, N P R, S, T 

Suction nozzle 

Discharge nozzle 

drive shaft 

force *) [Newton] 700 900 1500 1600 

tightening torque **) [Newtonmeter] 350 500 700 850 

force [Newton] 600 700 1200 1300 

tightening torque [Newtonmeter] 300 450 600 700 

radial force [Newton] 500 700 900 900 

axial force [Newton] 200 300 400 400 

Point of application 



drive shaft 

Frame size 

V, W, Y, Z, XA XB, XC, XD XE, XF 

force *) [Newton] 1700 2000 2400 

tightening torque **) [Newtonmeter] 1000 1150 1400 

force [Newton] 1500 1800 2100 

tightening torque [Newtonmeter] 900 1000 1200 

radial force [Newton] 1300 1500 1700 

axial force [Newton] 600 800 1000 

*) respectively in all 3 force directions. 

**) respectively in all axis directions. 

Hint! 

Due to the working principle of screw compressors dynamic pressure rates, input speed multiplied 

by number of lobes of male rotor, exist at compressor connections. The dynamic pressure 

rates and the static pressures at connections interfere with each other. Pay attention to the 

active load when calculating the pipework layout. 


23.03.2012




COUPLING REQUIREMENTS 

8 COUPLING REQUIREMENTS 

When using a coupling not supplied from the manufacturer the following conditions need to be met: 

Frame size 

E, G 

Parameters 

C, D 

28 

bar 

52 

bar 

H, L 

M, N * P 

28 

bar 

52 

bar 

R, S, 

T 

V, W, 

Y 

Z, XA 

XB, 

XC, 

XD 


maximum driving 

power (60 Hz) 

kW 180 

nominal torque Nm 500 

maximum starting 

torque 

Nm 1250 

180 

360 

360 

265 640 

500 

960 

960 

700 1700 

1250 2400 

2400 

1750 4200 

640 640 1500 1500 2160 3600 

1700 1700 4000 4000 5750 9500 

4200 4200 10000 10000 14300 23500 

maximum speed min -1 6000 4500 3600 

maximum dynamic 

unbalance allowable 

gcm 20 30 40 50 60 70 

permissible 

1) N 500 700 900 1300 1400 1500 1600 

Radial power F R 

permissible 

axial force F A 

shaft diameter 

Compressor 

N 200 300 400 600 600 800 800 

mm 

40 h6 

40 h6 

50 h6 

50 h6 

45 h6 60 h6 

60 h6 80 h6 80 h6 90 h6 110 h6 

min. distance between 

shaft ends 

mm 60 +5 70 +5 70 +5 80 +5 80 +5 80 +5 90 +5 

compressor/motor 2) 

* For type E/G and M/N shaft ends are different for 28 bar.g and 52 bar.g version. 

1) 

Allowable forces that may impact the compressor shaft end. The selection of coupling and the orientation are to 

be set up so that this force is not exceeded. 

2) Values apply to simply functioning mechanical shaft seals (Standard). When using double mechanical seals 

contact needs to be made with manufacturer. 

The maximum permitted drive capacities listed are upper limits determined by the drive shaft ends. Due to wear 

on the bearings, these drive forces shall not be achieved within a compressor size for all the available flow volumes. 

The testing will be carried out in the compressor selection program. 

For more information see chapter 3, page 12 regarding compressor model designation. 


23.03.2012




COUPLING REQUIREMENTS 

Further requirements: 

design of the compressor shaft end: 

attachment of the compressor shaft end: 

Direction of rotation: 

Start up and shut down frequency 

operating temperature range: 

cylindrical 

ATEX type compressors. cylindrical with feather key. 

by means of a firmly tightened clamping joint; 

Compressor in ATEX execution: Non-positive stack assembly with 

additional adjustment springs. 

clockwise and counter clockwise 

maximum 10 per hour 

- 20 °C to + 55 °C for dynamic operating load 


23.03.2012




COUPLING HOUSING 

9 COUPLING HOUSING 

9.1 COUPLING HOUSING WITH COUPLING (standard), TYPES C, D, E, G 

The following table shows only a selection of electric flange motors and the associated coupling types. In addition 

the manufacturer can also supply the appropriate coupling assemblies for other motors. Send either the motor 

manufacturer, capacity, description of the motor as well as the protection type or the corresponding motor information 

sheet to the manufacturer. 

Electric flange motor, type IM B 5 *) 

Coupling type 

Manufacturer output in kW Name Protection class SC Type C/D SC Type E/G 

Siemens AG 15 160M 1LA5 IP 54 

18.5 160L 1LA5 

A 

M 

22 180M 1LA6 B N 

30; 37 200L 1LA6 C P 

45 225M 1LA6 D R 

55 250M 1LA6 E S 

75 280S 1LA6 

90 280M 1LA6 

F 

T 

110 315S 1LA6 

132 315M 1LA6 

- U 

150 1PL6186-4HL - 

W/1 

(speed controlled) 

ABB 75, 90 250 SA2 IP 23 K 

110 250 MA2 

132 280 SMA2 

- 

U 

55 M2BA 250SMA IP 55 E - 

75 280 SA 

90 280 SMA 

F 

T 

110 315 SA 

132 315 SMA 

- U 

Leroy Somer 15 P160MG IP 23 

18.5 P160L 

30 P180M 

37 P180L 

G 

C 

V 

P 

55 PLS200LP H W 

75 P225M E S 


23.03.2012






Coupling type 


AEG 

(Schorch) 

90 P250S 

110 P250M 

132 P280M 

15 LS 160M IP 55 

18.5 LS 160L 

- U 

22 LS 180MT B N 

30 LS 200LT 

37 LS 200L 

55 LS 250MP 

S 

F 

75 LS 280SP/MP T 

110 LS 315SP/MP - U 

30 KN7 180M IP 23 

37 KN7 180L 

45 KN7 200M 

55 KN7 200L 

75 KN7 225M E S 

90 KN7 250S 

110 KN7 250M 

132 KN7 280M 

A 

C 

C 

H 

M 

P 

P 

W 

- U 

22 KA7 180M IP 54 B N 

30 KA7 207L 

37 KA7 200L 

45 KA7 225M D R 

55 KA7 250M E S 

75 KA7 280S 

90 KA7 280M 

110 KA7 315S 

132 KA7 315M 

Frank & Dvorak 15 160 MB IP 55 

18.5 160 L 

C 

F 

P 

T 

- U 

22 180 M B N 

A 

M 


23.03.2012






Coupling type 


30 200 LA 

37 200 LB 

C 

P 

45 225 M D R 

55 250 M E S 

75 280 S 

90 280 M 

VEM 15 K11R 160 MX2 IP 55 

18.5 K11R 160 L2 

F 

A 

T 

M 

22 K11R 180 M2 B N 

30 K11R 200 L2 

37 K11R 200 LX2 

C 

P 

45 K11R 225 M2 D R 

55 K11R 250 M2 E S 

75 K11R 280 S2 

90 K11R 280 M2 

F 

T 

110 K11R 315 S2 

132 K11R 315 M2 

- U 

WEG 75 225 S/M IP 23 - S 

special request Z Z 

*) in accordance with IEC standard 34-7; Use in design IM B 35 (flange motor with feet) also possible. 


23.03.2012




COUPLING HOUSING; COUPLING HOUSING WITH COUPLING (USA), TYPES C, 

D, E, G 

9.2 COUPLING HOUSING WITH COUPLING (USA), TYPES C, D, E, G 

The following table shows only a selection of electric flange motors and the associated coupling types. In addition 

the manufacturer can also supply the appropriate coupling assemblies for other motors. Send either the motor 

manufacturer, capacity, description of the motor as well as the protection type or the corresponding motor information 

sheet to the manufacturer. 

Coupling type 

Manufacturer 

output in PS 

(HP - Horse 

Power) 

Name Protection class SC Type C/D SC Type E/G 

USA 

(Nema-face) 

40 40 HP - 286 TS IP 23 D/1 R/1 

50 50 HP - 324 TS 

60 60 HP - 326 TS 

75 75 HP - 364 /5 TS 

100 

100 HP - 364 /5 

TS 

D/2 R/2 

125 

125 HP - 404 /5 

TS 

USA 

RAM Industries 

(C-face) 

50 

60 

75 

100 

125 

150 

E/ FES S/ FES 


23.03.2012




CONDITIONS FOR REFRIGERANT CONNECTIONS 

10 CONDITIONS FOR REFRIGERANT CONNECTIONS 

Port 



Economizer port 

Liquid injection 

Port 

Filter mesh size 

[μm] 

Series SH, MC: 

100 μm 

Series LT: 

140 μm 

Remarks 

During pressure equalization after stopping of the compressor, care 

should be taken to prevent foreign matter which are bigger than the 

mesh size in the suction filter from getting into the compressor together 

with refrigerant vapour flowing back from the plant components 

arranged downstream of the compressor. 

The operating range is between control slide positions of 100% and 

70% depending on operating conditions. At part-load operation, care 

should be taken to maintain the projected intermediate pressure. 

Refrigerant injection should only be used in conjunction with inertiafree 

temperature measurement on the compressor discharge side 

(Delay time k




CONDITIONS FOR LUBRICATING OIL CONNECTIONS 

11 CONDITIONS FOR LUBRICATING OIL CONNECTIONS 

Type 

Function, purpose 

Oil 

pump 

Volume flow 

Q oil 

Oil pressure 

p oil 

*) **) 

t oil 

Oil viscosity 

V 

Filter 

Filtration 

mesh 

C, D, 

E, G 

H, L, 

M, N 

P, R, 

S, T 

functional oil 1) 

without 

l/min bar °C mm 2 /s μm 

min max min max max min max 

see hints 

page 58 

p+0.5 5) 

p-4.5 

p+3.5 5) 80 7 70 ≤ 15 4) 

functional oil 2) p+0.5 5) 

without see hints 

p+3.5 5) 80 7 70 ≤ 15 

p-2,5 

page 58 

Oil injection without p-2.5 p+3.5 5) 100 1 70 ≤ 100 

functional oil 3) with see hints p+0.5 p+4 80 7 70 ≤ 15 

Oil injection without page 58 p-2.5 p+3.5 5) 100 1 70 ≤ 140 

Capacity control with 2 6 

balancing piston 

heat pump 

Chamber 1 6) p+0.5... 4.5 

Chamber 2 6) p 0 +7 

Chamber 3 6) p 0 4.5 

80 1 70 ≤ 15 

without 10 20 p-1.5 p 100 1 70 ≤ 15 

V, W, Y functional oil 3) with see hints p+0.5 p+4 80 7 70 ≤ 15 


Z, XA; 

XB, XC, 

XD, 




Heat pump 

Chamber 1 6) p+0.5... 4.5 


Chamber 3 6) p 0 4.5 

80 1 70 ≤ 15 

without 15 25 p-1.5 p 100 1 70 ≤ 15 

functional oil 3) with see hints p+0.5 p+4 80 7 70 ≤ 15 




Heat pump 

Chamber 1 6) p+0.5... 4.5 


Chamber 3 6) p 0 4.5 

80 1 70 ≤ 15 

without 20 35 p-1.5 p 100 1 70 ≤ 15 

p Discharge pressure [bar.g] p oil Oil pressure [bar.g] 

p 0 Suction pressure [bar.g] t oil Oil temperature [°C] 

Q oil Volume flow rate oil [l/min] V Viscosity [mm²/s] = [cSt] 


23.03.2012





p oil 

p 

1 ) 

2) 

3) 

4) 

functional oil flow 



oil filter in compressor 

oil pressure at the respective connection point of the compressor 

Discharge pressure 

For bearing, shaft seal, balance piston, oil injection and internal oil 

pump 

(for capacity control and Vi setting) 

For bearings, shaft seal, balance piston, oil injection and internal oil 

pump 

(for capacity control and Vi setting) 

For bearings, cam seals, balance pistons, capacity control, Vi setting 

5) 

6) 

*) 

**) 

Oil pressures when using an external oil pump 

Chambers 1,2 and 3 are defined in schematic diagram overleaf 

Values may deviate depending on the operating conditions. The requirements in the manufacturer specifications 

for operating conditions need to be adhered to. 

After start-up of the compressor drive motor, a failure of the oil pressure p oil is permissible for 10 sec within 

the first minute, and afterwards for 6 sec. 

Hint! 

Due to the screw compressors working principles, dynamic pressure points occur proportionally 

to the drive speed multiplied by the number of teeth on the male rotor on the connection 

with the screw compressor. These dynamic pressure effects occur in concert with the static 

pressure on the connections. These loads need to be included when designing the connection 

pipes. 


23.03.2012





Hints for the oil circuit 

Hint! 

1. "KAB COM" and "GUD" compressor selection programs from the manufacturer shall be used for selection and 

testing the screw compressor for the operating conditions. It gives additional information about the oil circuit of 

the compressor and application limits of the compressors belonging to the series SH and MC with integral oil 

pump. The compressor selection program explains what operating conditions will require an external oil pump 

for the functional oil circuit (external oil pump required). 

2. The oil volume flows needed to safely operate the compressor will be indicated in the compressor selection 

program based on operating conditions. The oil pump shall be measured so that the swept volume reaches 

the value of 

V oil pump = K • V functional oil. 

K= 1.25 for ammonia 

K = 1.4 for all other media to be pumped 

In the Grasso selection programme the terms 

- Functional oil flow 

- Total oil flow 

are used. 

3. LT Series 

Hydraulic chambers for capacity control and Vi adjustment: 

The hydraulic chamber for capacity control and Vi adjustments shall be supplied via solenoid valve blocks that 

are flanged on the compressor housing. The pressures entered in the table Chapter 11, page 56via the functional 

oil pressure as well as from the regulating valves integrated in the blocks. 

Schematic diagram: hydraulic chambers for capacity control and Vi adjustment. 

1, 2 : Hydraulic chambers for capacity control 

1, 2, 3 : Hydraulic chambers for combined Vi-partial load adjustment 


23.03.2012




ELECTRIC CONNECTIONS 

12 ELECTRIC CONNECTIONS 

Position sensors / Valve blocks 

Part 

connected load 

output 

signal 

Purpose 

Screw compressor 

Type 

Position sensor 24 V (DC) 4-20 mA 

position display 

Primary slide/ Control slide 

Vi slide position display 

C, D, E, G, H, L, M, N, P, 

R, S, T, V, W, Y, Z, XA, 

XB, XC, XD, XE, XF 

Valve block 2 

Valve block 4 

24 V (DC) 

24 V (AC) 

48 V (AC) 

110 V/ 115 V (AC) 

230 V (AC) 

- 

Operates capacity control with 

valve block 4 or combined Vi 

– part load adjustment with 

valve block 2 and 4 

C, D, E, G, H, L, M, N, 

P, R, S, T, V, W, Y, Z, 

XA, XB, XC, XD, XE, XF 

Position sensor connection diagram 

Connection set up: 

1 : Voltage, 24V DC 

2 : Ground, 0V DC 

3 : Signal output, 4 - 20 mA 

not used 

output signal: 

For series SH 

control slide min. pos.: 

control slide max. pos.: 

4 mA 

20 mA 

fig. 17: Position sensor connection 

diagram 

For series MC and LT 

control slide min. pos.: 

control slide max. pos.: 

For series MC: 

Vi slide position for small Vi: 

Vi slide position for large Vi: 

For series LT: 

secondary slide position min.: 

secondary slide position max.: 

4 mA 

20 mA 

4 mA 

20 mA 

4 mA 

20 mA 

Hint! 

The operation of Grasso screw compressors with variable Vi is permitted only if the compressor-control-software 

is based on the algorithm for Vi-adjustment defined by Grasso. 


23.03.2012





SOLENOID VALVES 

connection diagram 

Solenoid valve block 4 

installed in all compressors 

Solenoid valve block 2 

only in compressors with variable Vi 

fig. 18: Valve block 4 fig. 19: Valve block 2 

capacity increase: 

Adjusting primary slide or 

control slide into direction suction 

side 

Y1 and Y4 open 

Y2 and Y3 closed 

SH and MC series 

Vi-reduction 

Y6 open 

Y5 closed 

capacity reduction: 

Adjusting primary slide or 

control slide into direction discharge 

side 



Vi-increase 

Y5 open 

Y6 closed 

LT Series 

Valve block 4 for Vi setting Series LT, in combination 

with valve block 2, at full load (Mode 3) 

Part load operation: (Mode 1) 

Y5 open 

Y6 closed 

Vi-enlargement: 

Primary slide moves in direction 

discharge side: 

Y2 and Y3 opened 


Part load operation: (Mode 2) 

At reduction capacity secondary 

slide moves in direction suction 

side 

Y5 open 

Y6 closed 

Vi-reduction: 

Primary slide moves in direction 

suction side: 



At increase capacity secondary 

slide moves in direction discharge 

side 

Y5 closed 

Y6 open 

Full load operation: (Mode 3) 

Secondary slide is displaced with 

primary slide in the Vi setting 

Y5 closed 

Y6 open 


23.03.2012





Alternative solution in the sizes XB, XC, XD, XE and XF; UL requirements for the MC series: 

Directional valve blocks for capacity control and optional Vi-adjustment 

Directional valve block capacity control 

Directional control valve block Vi position 

fig. 20: Connection diagram directional control valve block 

capacity control 

fig. 21: Connection diagram directional control valve block Vi 

position 

Capacity control 

Combined Vi-/ part load control 

Capacity control in the upper part load operation: 

Control direction MAX: 

Y1/Y4 

Y2/Y3 

open 

closed 

Capacity increase 

Y5 

Y6 

closed 

open 

Control direction MIN: 

Y2/Y3 

Y1/Y4 

open 

closed 

capacity reduction: 

Y5 

Y6 

open 

closed 

Vi position at full capacity 

Y6 

Y5 

generally 

open 

generally 

closed 

Vi-increase 

Y2/Y3 

Y1/Y4 

open 

closed 

Vi-reduction 

Y2/Y3 

Y1/Y4 

closed 

open 


23.03.2012




STARTING CONDITIONS 

13 STARTING CONDITIONS 

STARTING CONDITIONS WHEN COMMISSIONING 

When commissioning the compressor, following conditions must be met: 

13.1 SH and MC series 

STARTUP CONDITIONS FOR COMPRESSORS IN THE SH SERIES (SIZES: C, D, E, G) AND MC SERIES 

(TYPES: H, L, M, N): 

Hint! 

When using refrigerant-soluble oils is necessary: 

For initial operation and for operation after lengthy idleness or maintenance a sufficient mixture 

of refrigerant and oil is to be provided before starting-up the screw compressor package since 

the high viscosity of the unmixed oil leads to bearing damage. 

Hint! 

When using an external oil pump for oil supply of the compressor, the oil pump has to start 

with starting the drive motor. 

1. Control slide in MIN-position 

– Energise Y1, Y2, Y3, Y4 before starting compressor drive motor to allow built in return spring to pull control 

slide towards minimum. 

– At start up the current signal from position sensor of control slide must be: 

– for Types C, D, E, G: 4...8,5 mA (0...30%). 

– for Types H, L, M, N: 4...8,5 mA (0...30%). 

– Should the current signal not be achieved after 180 seconds then the startup condition will be extended to 

a current signal of: 

– 15 mA (approximately 70%); Sizes C, D, E, G. 

– 15 mA (approximately 70%); Sizes H, L, M, N. 

– By starting the driving motor, the solenoid valves Y1 to Y4 are closed and the solenoid valves Y2 and 

Y3 are opened (minimum direction). 

Start the external oil pump if the compressor is not equipped with an internal oil pump. 

2. Limiting time periods 

– Within ten seconds if starting the drive motor, the oil pressure at the recommended measuring point (see 

P+I scheme for the compressor) has to be the min. value in accordance with datasheet Chapter 11, 

page 56. 

3. Oil pressure 

– For oil pressure see data sheet Chapter 11, page 56. 

– Before starting the compressor use the control to check: 

– the minimum and maximum oil differential pressure. 

– the maximum oil pressure. 


23.03.2012




STARTING CONDITIONS 

4. Oil temperature 

– The oil temperature upstream of the compressor must be at least 18°C at an oil viscosity of ≤ 70 cSt (refer 

Chapter 5, page 19). 

Caution! 

After shut down of the oil pump between 15 sec. and 180 sec. during a start-up, an interval of 

600 sec is required prior to restarting the oil pump and starting the compressor driving motor. 

The compressor is filled with oil that flows out within the 600 seconds pause. 

SHUT DOWN CONDITIONS FOR COMPRESSORS IN THE SH SERIES (SIZES: C, D, E, G) AND MC SERIES 

(TYPES: H, L, M, N): 

Hint! 

When using an external oil pump for oil supply of the compressor, the oil pump has to stop 

with stop of the drive motor. 

Switch lock time (Start to Start) 

Hint! 

The minimum switch lock time, time between two starts, must be at least (0...600) seconds, if 

the manufacturer of the drive motor requires no higher switch lock time. 

Forced break (Stop to Start) 

Hint! 

The minimum forced break, stationary after compressor stop, must be at least (0...10) seconds. 


23.03.2012




STARTING CONDITIONS; LT SERIES 

13.2 LT SERIES 

STARTING CONDITIONS FOR COMPRESSORS OF LT SERIES (TYPES P, R, S, T, V, W, Y, Z, XA, XB, XC, 

XD, XE, XF): 

Caution! 

When using refrigerant-soluble oils is necessary: 

For initial operation and for operation after lengthy idleness or maintenance a sufficient mixture 

of refrigerant and oil is to be provided before starting-up the screw compressor package 

since the high viscosity of the unmixed oil leads to bearing damage. 

1. Control slide in MIN-position 

– Solenoid valve controls Y2 and Y3 when the compressor comes with a solenoid valve block. 

Energise solenoid valves Y2/Y3 if the compressor is equipped with a directional valve block, minimum direction. 

– Starting the external oil pump to push control slide towards minimum. 

– At start up the current signal from position sensor of control slide must be: 4...5 mA (0%...6%). 

2. Time sequence and limitations 

– Start the oil pump prior to starting the compressor 

– Only when both the required Minimum position of the control slide and the oil pressure have been 

reached within the first 15 sec after start-up of the oil pump it is permitted to start the compressor drive 

motor. 

– Should the requirements not be achieved within this time, the oil pump will continue to operate for up to 

180 seconds until both requirements are fulfilled. The start-up of the drive motor immediately afterwards is 

not allowed. 

3. Oil pressure 

– For oil pressure see data sheet Chapter 11, page 56. 

– Before starting the compressor use the control to check: 

– the minimum and maximum oil differential pressure. 

– the maximum oil pressure. 

– After start-up of the compressor drive motor, a failure of the oil pressure p oil is permissible for 10 sec within 

the first minute, and afterwards for 6 sec. 

4. Oil temperature 

– The oil temperature upstream of the compressor must be at least 18°C at an oil viscosity of ≤ 70 cSt (refer 

Chapter 5, page 19). 

Caution! 

After shut down of the oil pump between 15 sec. and 180 sec. during a start-up, an interval of 

600 sec is required prior to restarting the oil pump and starting the compressor driving motor. 

The compressor is filled with oil that flows out within the 600 seconds pause. 


23.03.2012




STARTING CONDITIONS; LT SERIES 

Hint! 

If the oil pump keeps running for more than 180 sec., a further start-up is forbidden. 

An error message will be displayed in the compressor control system. Search for the source of 

the error. 

Switch lock time (Start to Start) 

Hint! 

The minimum switch lock time, time between two starts, must be at least (0...600) seconds, if 

the manufacturer of the drive motor requires no higher switch lock time. 

Forced break (Stop to Start) 

Hint! 

The minimum forced break, stationary after compressor stop, must be at least (0...10) seconds. 

. 


23.03.2012




OPERATION MONITORING 

14 OPERATION MONITORING 

Hint! 

Compressors may only be run between the prescribed usage parameters. The limits and instructions 

can be found in the compressor selection program and the Application Limits (Chapter 

5, page 19) chapter. 

The following parameters must be recorded and monitored during operation of the compressor: 

Parameter To be recorded Purpose 

Current for the driver 

Motor speed 1) 

Position of control slide (primary 

slide) 

Position of Vi-slide (respectively 

secondary slide) 3) 

Suction pressure 

Discharge pressure 

Discharge temperature 4) 

Oil temperature upstream of compressor 

Compressor oil inlet pressure (after 

oil pump) 

1) 

Compressor protection 

Upper limit value 

(Motor current limiter) 

Motor speed 

Min-Setting 

Overall adjustment track between 

min. and max.-Position of the slide 

Entire adjustment length between 

Vi max and Vi min 

Lower limit value 

Suction pressure within the measuring 

range to be specified 


Discharge pressure within the 

measuring range to be specified 3) 


Oil feed temperature for bearings 

and shaft seal within the measuring 

range to be specified 

Differential pressure between oil 

pressure entering the compressor 

and compressor discharge pressure 

Protection of motor and compressor 

Adherence to the maximum and 

minimum permitted speeds 

Ensures unloaded start 

-For partial load regulation 

- For combined Vi partial load regulator 

2) 

Vi-adjustment 

Protection against low suction pressure 

Controlled variable for capacity control 

and Vi adjustment 

Protection of compressor and plant 

components 

Controlled variable for Vi-adjustment 

Protection of compressor and plant 

components 

Protection of compressor 

Protection of compressor 

2) Only for compressors with Vi-adjustment. 

3) Series MC is equipped with a path sensor for Vi adjustment by default, at Series LT a path sensor for the secondary 

slide will be installed depending upon request. 

4) Recorded transmitters with a low time constant k (k < 10 sec). 


23.03.2012




LUBRICATING OILS FOR SCREW COMPRESSORS 

15 LUBRICATING OILS FOR SCREW COMPRESSORS 

15.1 Lubricating oil selection list 

Special refrigeration oils must be used for Grasso screw compressors. The selection of the oils depends on the 

chemical properties of the oil, the refrigerants, the operating conditions of the plant and the required oil viscosity 

during startup and run. After inquiring with the compressor manufacturer, oils other than those listed in the table 

may also be used. For further information on the listed oils please refer to the data sheets and diagrams of the oil 

manufacturers. For refrigeration compressors special refrigeration oils have to be used. The selection depends on 

the refrigerant, viscosity (at least 7 cSt for oil temperature before entering the compressor), evaporating temperature 

(pour point) and requirement made of the oil separation behaviour (flash point, viscosity). 

Basis of the lubricating oils and used abbreviations: 

M 

M * 

AB 

PAO 

E 

PAG 

Mineral oil 

Mineral oil with special treatment (hydrocracked oil) 

Alkyl benzene 

Polyalphaolefin 

Polyolester 

Polyalcyl glycol 

Table 1: Lubricating oils for R717 (Ammonia) 

(recommended especially if minimum oil carry-over from the oil separator is important) 

Manufacturer Type of oil 

Basis 

Viscosity 

at 

40°C in cSt 

Flash point 

in °C 

Pour point 

in °C 

Remark NSF Grade 2) 

CPI 

Klüber Lubrication 

Shell 

CP 1009-68 M * 68 226 -40 

CP 1008-68 M * 64.9 240 -39 H2 

Klüber 

Summit 

RHT 68 

M * 62 230 -35 

Shell Clavus 

S 68 1) M* 68 232 -39 

Petro Canada Reflo 68A M * 58 236 -42 Hydrotreated H2 

for R717 

Capella 

TEXACO 

M * PAO 67 262 -42 only 

Premium 

Paramo 

TOTAL 

Fuchs 

Mogul 

Komprimo 

ONC 68 

Lunaria NH 

68 

Reniso 

Ultracool 68 

1) Product no longer available. 

M * 68 230 -33 

M * 68 230 -36 

M * PAO 62 250 -48 

2) Application area in food-processing industry according to NSF (National Sanitation Foundation, www.nsf.org) 

– H1: Applicable in all food-processing environments where there is the possibility of incidental food contact. 

– H2: Applicable in all food-processing environments where there is no possibility of incidental food contact. 

H2 


23.03.2012





Table 2: Lubricating oils for DX Chiller with R717 (Ammonia) 


Basis 

Viscosity 

at 

40°C in cSt 

Flash point 

in °C 

Pour point 

in °C 


CPI CP 412-100 PAG 98 226 -40 

Fuchs 

Fuchs Reniso 

PG 68 

PAG 62 230 -35 

Shell 

Shell Clavus 

SG 68 

PAG 73.5 >250 -48 

Mobil 

Mobil Zerice 

S32 

AB 32 154 -33 

Please contact 

manufacturer 





23.03.2012





Table 3: Lubricating oils for R717 (Ammonia) and R22 

Manufacturer Type of oil Basis 

Viscosity 

at 

40°C in cSt 

Flash point 

in °C 

Pour point 

in °C 


Icematic 299 M 56 180 -34 

Castrol 

Icematic 

2294 

PAO 69 233 -60 

for R717 

only 

CPI 

CP-4600- 

46F 

PAO 46 268 -51 

for R717 

only 

H1 

Zerice S32 AB 32 154 -33 

Zerice S68 AB 68 174 -27 

Gargoyle 

Arctic SHC 

226E 

PAO 68 266 -45 

for R717 

only 

H1 

MOBIL 

Gargoyle 

Arctic SHC 

NH 68 

Gargoyle 

Arctic 300 

Gargoyle 

Arctic C 

Heavy 

AB/PAO 64 211 -54 

M 68 200 -42 

M 46 195 -42 

Fuchs 

Shell 

Reniso S68 AB 68 190 -33 

Reniso 

Synth 68 

Reniso KS 

46 

Reniso KC 

68 

PAO 68 260 -57 

M 46 195 -42 

M 68 200 -39 

Shell Clavus 

1) M 44 195 -39 

46 

Shell Clavus 

1) M 65 205 -36 

68 

for R717 

only 

Shell Clavus 

G46 1) M 44 195 -39 for R22 only 

Shell Clavus 

1) M 65 205 -36 

G68 

Shell Refrigeration 

Oil 

S4 FR-V 46 

AB 46 180 -42 

for R717 

only 

H1 


23.03.2012






Viscosity 

at 

40°C in cSt 

Flash point 

in °C 

Pour point 

in °C 



Oil 

S4 FR-V 68 

AB 68 190 -39 

Lunaria NH 

46 

M 46 226 -36 

for R717 

only 

H1 

TOTAL 

Lunaria SH 

46 

PAO 44 252 -51 

for R717 

only 

Lunaria FR 

68 

M 68 175 -34 for R22 only 

Petro Canada 

Reflo Synthetic 

68A 

AB/PAO 62 245 -54 

for R717 

only 






23.03.2012





Table 4: Lubricating oils for R134a; R404A; R407C; R410A; R507 


Viscosity 

at 

40°C in cSt 

Flash point 

in °C 

Pour point 

in °C 


Castrol 

Icematic SW 68 

Icematic SW 

220 

E 

68 250 -39 

220 290 -26 

Solest 68 

64 266 -43 

CPI 

Solest 120 E 125 262 -27 

Solest 220 216 271 -27 

Reniso Triton 

SE 55 

53 270 -51 

Fuchs 

Shell 

MOBIL 

Reniso Triton 

SEZ 80 

Reniso Triton 

SEZ 100 

Reniso Triton 

SE 170 

E 

80 275 -39 

91 288 -39 

170 260 -24 

Reniso PAG 220 PAG 220 240 -38 

Shell ClavusR68 

1) 

E 

64 250 -54 

Shell Clavus R 

1) 93 280 -45 

100 


Oil S4 FR-F 

68 


Oil S4 FR-F 

100 

66 230 -42 

94 230 -42 

EAL Arctic 68 

68 230 -36 

E 

EAL Arctic 100 105 250 -30 

for R134a 

only 

TOTAL 

Planetelf ACD 

100FY 

Planetelf ACD 

150FY 

E 

100 270 -30 

150 272 -36 






23.03.2012





Hint! 

When using high-viscosity oils with high refrigerant solubility after initial fill of the plant a sufficient 

mixture from refrigerant and oil has to be provided before start-up the screw compressor. 


23.03.2012





Table 5: Lubricating oils for natural gas and hydrocarbon compounds 

Manufacturer 

Type of oil 

Basis 

Viscosity 

at 

40°C in 

cSt 

Flash 

point 

in °C 

Pour 

point 

in °C 

Remark 

NSF 

Grade 

2) 

BP Energol RC-R 68 M 67 234 -30 for natural gas compression 

CPI 

CP-1515-68 

65 224 For heavy hydrocarbons, where 

strong dilution or condensation 

CP-1515-100 103 260 

will occur 

CP-1516-68 PAG 62 229 For propane refrigerant plants 

CP-1516-100 92 260 

or volatile hydrocarbons, where 

the danger of stronger dilution 

CP-1516-150 153 260 -34 or condensation does not exist 

CP-4601-68 

60 271 For high temperature application 

and for feed gas control 

H2 

PAO 

CP-4601-100 106 271 compressors for gas turbines H2 

CP-9001-68 

69 241 

for feed gas control compressors 

for gas turbines 

M 

CP-9001-100 108 260 H2 

MOBIL 

CP-1507-68 

PAG 

CP-1507-100 89 260 

Glygoyle 11 

85 226 -45 

PAG 

Glygoyle 22 177 229 -41 

62 231 For heavy hydrocarbons, for 

hydrocarbon cooling applications 

in range of high pressure/ 

low temperature 

For natural gas and propane 

Comptella Oil S68 M 68 240 For natural gas 

Shell 

TOTAL 

Klüber 

Summit 

Madrela Oil T 1) PAG 185 260 -30 For natural gas and propane 

Shell Gas Compressor 

Oil S4 PV 

PAG 190 262 -30 For natural gas and propane 

DACNIS LPG 150 

3) PAG 142 280 -48 

Summit NGSH- 

100 

PAO/ 

E 

140 250 -46 

For natural gas, propane and 

volatile hydrocarbons 

For natural gas, for feed gas 

control compressors for gas 

turbines and hydrocarbons 





3) Product rebranded from "TOTAL Primera LPG 150" into "TOTAL DACNIS LPG 150". 


23.03.2012





Table 6: Lubricating oils for CO 2 application 


Basis 

Viscosity 

at 

40°C in cSt 

Flash point 

in °C 

Pour point 

in °C 


CP-4600- 

68F 

68 immiscible H1 

CPI 

CP-4624- 

46F 

PAO 

46 H1 

CP-4624- 

68F 

68 H1 

Reniso C 

85 E 

E * 278 

complete 

miscible 

Fuchs 

Reniso C 

130 E 

E * 136 -27 

Reniso C 

170 E 

E * 170 -30 

attend to 

the miscibility 

gap 

Shell 

Clavus SG 

68 

PAG 73.5 >250 -48 

partially 

miscible 

only 

* During application of Polyolester: t oil inlet ≤ t discharge - 4K 




Hint! 

When using high-viscosity oils with high refrigerant solubility after initial fill of the plant a sufficient 

mixture from refrigerant and oil has to be provided before start-up the screw compressor. 


23.03.2012





Table 7: Use of O-ring elastomers in screw compressors depends on refrigerant and lubricant: 

Refrigerant 

Oil 

M M* M*/PAO AB E PAO AB/PAO PAG 

R717 (ammonia) 

CR 1) / 

HNBR 

CR 1) / 

HNBR 

HNBR CR - HNBR CR HNBR 

R22 CR - - CR CR - - - 

R134a, R404A, 

R407C, R410A, R507, 

R23 

R290 (propane), 

R1270 (propylene) 

R744 (Carbon dioxide 

CO 2 ) 

- - - - HNBR - - - 

- - - - - HNBR - HNBR 

- - - - HNBR HNBR - HNBR 

Abbreviations used for the elastomers: 

CR Chloroprene (Neoprene caoutchouc) 

HNBR Hydrogenated nitrile butadiene caoutchouc 

1) 

for shaft seal : HNBR 

Hint! 

If natural gas and hydrocarbon compounds are used as compression medium (Table 5; 

page 73), elastomer O-rings should be requested from the manufacturer depending on the operation 

condition. 

Hint! 

• The pour point describes the cold fluidity of an oil and represents a non-guaranteed guide value for 

the minimum evaporating temperature. [The pour point is defined as the temperature at which the 

fluidity of an oil decreases to an extent that it does not leave a jar within 5 sec under certain conditions.] 

• Compressors are equipped with suitable elastomers at the sealing point, which are selected dependent 

on the refrigerant and lubricant. Table 7: page 75) 

• When selecting the type of oil, the compatibility of the sealant material used in the compressor for 

o-rings (elastomer quality) must be taken into consideration in addition to the refrigerant. Table 7: 

page 75) 

• Not all the listed oil types can be used for an existing compressor. It is absolutely necessary to 

assign the oil grade depending on the elastomer used, even if the refrigerant is the same. 

• Oil grades are not always compatible with each other (cannot be mixed). 

• Changing from one oil type to another can lead to disruptions in the operation of the compressor 

and to leakages at the sealing points. The compressor manufacturer should always be contacted 

before changing the oil type. 


23.03.2012





Caution! 

• The specified range of viscosity of the lubricating oil upstream of the compressor has to be 

observed in any case. At the same time, it must be noted that refrigerant/oil combinations are 

possible in which, dependent on the pressure and temperature in the oil separator of the package, 

the refrigerant dissolves in the oil. This leads to a reduction of the viscosity of the pure oil and to 

the formation of foam when the solution equilibrium is altered due to pressure reduction or temperature 

increase. In this case, the oil must be cooled by a minimum temperature difference, 

which is calculated in the compressor selection programme for the given operating conditions. 

The compressor may only be operated if the oil entry temperature is complied with in accordance 

with the compressor selection programme! 

• The oil separation ration for the oil types in the table can differ greatly (e.g.: influence of oil vapour 

pressure, oil viscosity, solubility, discharge temperature). 


23.03.2012




LUBRICATING OILS FOR SCREW COMPRESSORS; HINTS FOR SELECTION OF 

REFRIGERATION OIL 

15.2 HINTS FOR SELECTION OF REFRIGERATION OIL 

The characteristics of refrigerating machine oil influence the functionality of a refrigerator with oil flooded screw 

compressors, since this cannot be precluded despite the high-capacity oil separator and remnants of refrigerating 

machine oil can enter the refrigerant line. So when selecting oil, 

• a sufficient lubricity of the oil at the bearing points of the screw compressor (minimum oil viscosity with consideration 

of the solubility of refrigerants in oil depending on both the pressure and temperature), 

• the vapour pressure of the oil for a proper separation behaviour in the oil separator, 

• a sufficient fluidity of the oil at both the evaporating and suction temperature, 

• the requirements upon the miscibility of the liquid phases of the refrigerant and the oil (miscibility gap). 

need to be taken into account. 

The refrigerant used, the operation conditions and the specific plant design all determine the required characteristics 

of the refrigeration oil. 

At present, five different base oil brands are used: 

1. Mineral oils for ammonia and R22 

2. Polyalphaolefins for ammonia and CO 2 (R744) 

3. Alkyl benzene for ammonia and R22 

4. Polyglycol (PAG-oil) for ammonia, CO 2 and R134a 

5. Ester oil for R404A, R134a, R 507 and CO 2 , along with other coolant mixtures such as R410A and R407C 

Besides the pure base oil components other blends of mineral oil and alkyl benzene or of polyalphaolefin and 

alkyl benzene can also be used. 

The characteristics of the refrigerants regarding the oils mentioned are very different. 

Thereby 2 fundamental requirements are needed from the refrigerant and refrigeration oil: 

and 

a) Minimum oil viscosity of 7 cSt, maximum 70cSt, at the compressor inlet with consideration for the refrigerant 

solubility in oil 

b) Miscibility of both liquid phases of a certain portion of the oil (approx. 1 to 2 %) and the refrigerant. 

In addition to the lubrication oil viscosity requirements the discharge temperatures in the compressor need to be 

high enough so that oil containing refrigerants can be cooled by at least 10 K, so that no foam forms in the compressor 

in the event of lower temperatures and/or temperature increases before the oil reaches the storage locations. 

The basic requirements b) are not fulfilled by mineral oil, alkyl benzene polyalphaolefin in association with 

ammonia, since the no 100% mixture gap is created and neither the solubility of the refrigerant vapour in the oil 

nor miscibility in the liquid phases. Nevertheless these oils are used NH 3 plants. Fine oil separation phases prevent 

larger oil volumes from entering the refrigeration circuit. 

The base oil versions mentioned will bring about differing oil carry-over rates as the flash points of the oils cited 

differ greatly from each other (lowest flash point of alkyl benzene at approx. 160 °C, highest flash point of polyalphaolefin 

considerably above 200 °C). 

Even though the flowabiltiy of the oil is characterized though the pourpoint provided by oil manufacturers, the 

basic oil types named above have varying VT characteristics so that even with equivalent initial viscosities such 

as 68 cSt viscosity differences may occur at lower temperatures in the evaporator, which at -20°C vary between 

1500 and 20000 cSt. 


23.03.2012






With relation to oils, the refrigerants feature the following properties: 

• Ammonia 

With the exception of PAG oil, ammonia is not soluble with other lubricants. The mechanical mixture is very 

intense so that oil is always carried with the ammonia. Due to the low share of ammonia, the lubrication of the 

oil will not change and the miscibility of oil and refrigerant during the liquid phases is not possible. Efficient oil 

separation is thus necessary. 

• HFC (e.g. R134a, R404A, R507) 

HFC contains no chlorine and is not limited in its applications. Ester oil is used for this refrigerant. The greater 

solubility of this refrigerant in ester oil needs to be taken into account when selecting oil, since the initial viscosity 

of the oil through the dissolving of refrigerant in the oil can change significantly. However, the fluidity of 

the oil in the evaporator is given due to proper miscibility over a wide range. 

The most important properties of the main oil groups are described in the following: 

1. Mineral oil 

Naphten-based mineral oils are best suited for refrigerating plants, but paraffin-based oils are also used. Special 

treatment (paraffin removal) means that paraffin-based oils have more or less the same characteristics as 

naphten-based oils. Mineral oils are characterized by relatively low miscibility with HCFCs (e.g. R22) at lower 

temperatures. Mineral oils have a relatively high viscosity index and low steam pressure (high flammability) 

that positively influences the oil impact. 

2. Alkyl benzene (also known as alkyl benzole) 

Alkyl benzenes are synthetic oils created from natural gas. They are characterized by high miscibility with 

HCFC's (e.g. R22) even at lower evaporating temperatures. Alkyl benzenes have greater thermal stability 

than mineral oils (ammonia use in piston compressors). However they have a higher tendency towards foam 

formation than mineral oils in the oil separator and thus to greater discharge despite the lower flame point. 

When switching from mineral oil to alkyl benzenes, it should be noted that alkyl benzenes have higher cleaning 

efficiency and thus the filter will dirty faster after the oil change. 

3. Polyalphaolefin 

Polyalphaolefins are synthetic oils with high levels of chemical and thermal stability. They are thus preferred 

for use in compressors with high discharge temperatures e.g. in heat pumps Polyalphaolefins are also used in 

ammonia plants. The very low pour point creates a very low evaporating temperature. The high flame point 

leads to low oil discharge. 

Note: The high aniline point of polyalphaolefin causes a relatively high shrinkage of O-rings with CR 

material whereby leakages may occur even at static seals, when mineral oils or alkyl benzenes are replaced 

by polyalphaolefins. 

Shrinkage can be avoided if synthetic oil mixtures of polyalphaolefin and alkyl benzene are used. For use of 

pure PAO oils, Grasso compressors will be equipped with HNBR rings where no shrinking associated with the 

oil can occur. 

4. Ester oils 

As opposed to mineral oils, alkyl benzenes and polyalphaolefins, ester oils are soluble in the new nonchlorinated 

HFC's (R134a, R404A, R507 etc.) So ester oils are thus the only lubricant that may be used with 

HFCs. Ester oils have a high flash point, whereby the oil vapour share in the oil separator and thus the oil discharge 

are positively influenced. Ester oils are hygroscopic. They absorb water when they come into contact 

with the atmosphere. Ester oils thus need to be stored in sealed containers. The compressor needs to be 

thoroughly evacuated before the oil filling. 

5. Polyglycol oil 

Polyglycol oils are soluble in ammonia and very hygroscopic. They are thus subject to the same handling 

conditions as ester oils. When selecting oils the drop in viscosity resulting from dissolving refrigerants in the 


23.03.2012






oil needs to be taken into consideration. The flowablility of the oil in the evaporator needs to be tested taking 

into account the miscibility between the refrigerating machine oil and the refrigerant at each relevant evaporating 

temperature. 

PARAMETERS USED FOR OILS: 

Specific density 

The density difference between the coolant and oil may be important for the oil return. Care should be taken 

that alkyl benzene has a lower density than mineral oils and polyglycol and greater density than mineral oil. 

The method for measuring density is described in DIN 51757. 

Viscosity 

In accordance with the ISO 3448 standard lubricants are classified according to viscosity classes listed as 

ISO VG No. The ISO No. is only a nominal value in such classes, i.e. the actual viscosity may deviate in certain 

areas (DIN 51562). The viscosity entries are based on the temperatures of 40°C and 100°C. 

Viscosity index 

The viscosity index supplies the connection between the change in viscosity depending on the temperature 

(ISO 2909). Greater viscosity index readings mean lower viscosity changes when temperatures change compared 

to lower viscosity index values. 

Flash point 

The flash point indicates at which temperature the vapours escaping from a heated cup may be ignited over a 

flame. The measuring method is described in ISO 2592. Oils with higher flash points have lower oil vapour 

pressures. This will enhance the possibilities of oil separation from a compressed gas in the oil separator and 

reduce the oil carry-over rate from the compressor into the plant. 

Pourpoint 

The pour point is the temperature, where the flowability of oil declines so that that under certain conditions no 

oil will flow from a container within five seconds. In accordance with the standards, the pourpoint temperature 

is 3% lower than the measured temperature (measuring method in accordance with ISO 3016) The pour point 

is interesting for material pairs that are not soluble with one another. Oils with a low pourpoint are easier to 

lead back to the suction side than oils with higher pour points. Practice teaches that it is possible to use oils at 

evaporating temperatures lower than the pourpoint without having any operational problems. 

Floc point 

The floc point is the temperature where R12 liquids with a 10% oil admixture will become darkened due to 

wax particles separating from the oil when the liquid is cooled (measuring method in accordance with DIN 

51351). The floc point is interesting when oils and refrigerants are mixed together. The floc point displays that 

oil has fewer wax components and plants with HCFC (e.g. R22) can be operated at lower evaporating temperatures. 

Wax from oil can lead to problems on the expansion valves or on regulating valves. A critical solution 

temperature shall be supplied for ester oils using a mixture of 10% oil and 90% R134a. The critical solution 

temperature is that which the oil is completely removed from the refrigerant (no standardized amount). 

Aniline point 

The aniline point indicates the temperature at which a homogeneous solution will clear when warmed with a 

constant volume share of a lubricant or lubrication material or oil and aniline when cooling and clouding occurs 

through separation upon cooling. The aniline point is the measurement of unsaturated carbon which can 

be found in the oil. It is also the measurement of various sealing materials the oil comes into contact with 

(measuring method in accordance with ISO 3977). Most refrigerating machine oils have a low aniline point. 

Neoprene or chloroprene o-rings swell and therefore need to be replaced after disassembly. Polyalphaolefin 

refrigerating machine oils have a high aniline point so the neoprene will shrink. When using polyalphaolefin as 

refrigerating machine oil the use of HNBR as material in the o-rings is necessary. 


23.03.2012






Neutralization number 

The neutralization number displays the acidic value of an oil and is generated using titration with caustic soda 

(KOH). The value is provided in mg KOH per g oil (measurement method in accordance with DIN 51558). 

Fresh oil should have low neutralization number. 

Hints for oil change 

When changing the oil type or the manufacturer of an oil, consult the seal manufacturer beforehand to prevent 

any problems in operating the plant. If the oils are not compatible excretions from the oil are possible which 

may lead to problems with the plant (oil filter, lubricating capacity of the bearings, oil return not assured). 

Should it still be necessary to use another type of oil it is absolutely imperative that all oil be removed from the 

plant and compressor and oil separator be thoroughly cleaned (when possible with additional rinse cycle). 

Oil selection table 

All oils permitted for use in Grasso screw compressors are listed in the oil selection table. Depending on the 

specifications of the plant the technical characteristics listed above need to be taken into consideration when 

making the oil selection. 

TABLE: Refrigerant – oil compatibility 

Ammonia 

(NH 3 ) 

R22 R134a R404A R407C R410A R507 CO 2 

Mineral oil (M) x x NO NO NO NO NO NO 

Polyalphaolefin 

(PAO) 

Alkyl benzene 

(AB) 

polyglycol 

(PAG) 

* NO NO NO NO NO NO * 

x x NO NO NO NO NO NO 

* NO NO 1) NO NO NO NO * 

Ester oil NO x * * * * * * 

M + AB x x NO NO NO NO NO NO 

PAO + AB 

x NO NO NO NO NO NO NO 

x = suitable, use of CR-O-rings 

* = suitable, use of HNBR O-rings 

NO = not suitable 

NO 1) = not suitable except refer Table 4 page 71 


23.03.2012




SCHEMATIC DIAGRAM, CONNECTIONS 

16 SCHEMATIC DIAGRAM, CONNECTIONS 

Scheme, connections; Type C, D, E, G 

• P+I Diagram 

• Internal Oil Passage 

• External Connections 

• Connections / Threads 

• Input Voltage 

• Oil management versions 

Scheme, connections; Types H, L, M, N 


• Internal Oil Passage 




Scheme, connections; Types P; R, S, T; V, W, Y 





Scheme, connections; Types Z, XA; XB, XC, XD; XE, XF 






23.03.2012




SCHEMATIC DIAGRAM, CONNECTIONS; FRAME SIZES C, D, E, G 

16.1 FRAME SIZES C, D, E, G 

P+I DIAGRAMM 

Hint! 

The P+I diagram applies to the screw compressor only. 

The P+I diagram for the screw compressor only shows the connecting conditions to the screw 

compressor package. 

The P+I diagram of the screw compressor does not consider the piping scheme and the safety 

devices of the screw compressor package. 

The nameplate of each compressor is marked with the pertaining P+I number of the screw 

compressor. 

The relevant piping diagram of the screw compressor is part of the documentation and will be 

supplied with the compressor. 

The following depicts the interior piping scheme for screw compressors in standard usage in single phase highpressure 

operations. P+I diagrams are available for connecting the package oil circuit to the compressor, which 

will be determined based on the usage of the machines and have special labels. 

INTERNAL OIL PASSAGE 

fig. 22: Internal oil passage, Types C, D, E, G 


23.03.2012





CONNECTIONS MALE ROTOR SIDE 

fig. 23: Connections male rotor side, Types C, D, E, G 

The descriptions of the connections are shown on tables on page 85 and page 87. 

CONNECTIONS DISCHARGE END 

fig. 24: Connections discharge end, Types C, D, E, G 



23.03.2012





CONNECTIONS FEMALE ROTOR SIDE 

fig. 25: Connections female rotor side, Types C, D, E, G 



23.03.2012





CONNECTIONS / THREADS 

Port 

Purpose 

Nominal cross section/ thread 

C / D 

E / G 

A 


DN 80 

M16 x 22 

DN 100 

M16 x 27 

B1/B2 

Discharge side, below/ discharge side, lateral 

DN 50 

M16 x 25 

DN 65 

M16 x 24 

C Oil supply M26 x 1,5 M26 x 1,5 

C1 Oil supply functional oil for oil management 3 M16 x 1,5 M16 x 1,5 

C2 Oil supply functional oil for oil management 4 M26 x 1,5 M26 x 1,5 

C3 Connection to the solenoid valve block for oil management 5 G ¼ G ¼ 

C4 Connection to the oil pump for oil management 2 M16 x 1,5 M16 x 1,5 

D Economizer port female rotor side M33 x 2 M33 x 2 

D1 Economizer port male rotor side (optional) - M 33 x 2 

D2 Additional port after the suction filter G ¼ G ¼ 

E1 Refrigerant injection (ND) M14 x 1,5 M14 x 1,5 

E2 Refrigerant injection (HD) M14 x 1,5 M14 x 1,5 

F Gas pulsation protection M14 x 1,5 M14 x 1,5 

G Additional oil injection M16 x 1,5 M16 x 1,5 

G1 Outlet oil strainer at the connection G M16 x 1,5 M16 x 1,5 

H Outlet oil strainer at the oil pump (connection Z) M16 x 1,5 M16 x 1,5 

H1 Additional connection after oil filter - M16 x 1,5 

K Supply function oil external oil pump M16 x 1,5 M16 x 1,5 

L Oil supply capacity control from oil pump G ¼ G ¼ 

M Oil return oil separator M16 x 1,5 M16 x 1,5 

N 

Oil supply – function oil/ special design or measure oil pressure of 

function oil 

M16 x 1,5 M16 x 1,5 

U Oil drain plug M16 x 1,5 M16 x 1,5 

V Purge valve (Valve 105) M16 x 1,5 M16 x 1,5 

W Drain oil filter (Valve 105) M16 x 1,5 M16 x 1,5 

Z Oil supply flanged oil pump M16 x 1,5 M16 x 1,5 

O1 Measuring suction pressure before filter G ¼ G ¼ 

P Discharge pressure before check valve G ¼ G ¼ 


23.03.2012





Port 

Purpose 


C / D 

E / G 

R Outlet oil strainer at the external oil pump M26 x 1,5 M26 x 1,5 

S Discharge pressure after check valve M10 x 1,0 M10 x 1,0 

86 Control-stop valve cooling oil G ¾ G ¾ 

VS Vibration sensor connection ¼“- 28 UNF x 8 

X1 Pressure oil pump G ¼ G ¼ 

X2 Oil pressure behind strainer G ¼ G ¼ 

27 measuring suction temperature M12 x 1,5 M12 x 1,5 

28 Discharge temperature M12 x 1,5 M12 x 1,5 

29 Oil temperature M12 x 1,5 M12 x 1,5 

106 Stop valve pump suction side 


23.03.2012






Port Purpose Inlet Outlet 

452 Position sensor: Position Display of the Control Slide 24 V (DC) 4 - 20 mA 

Y1/Y4 Solenoid valves capacity control , direction full load 230 V AC 

Y2/Y3 Solenoid valves capacity control, direction part load 

110 V/ 115 V AC 

48 V AC 

Y5 Solenoid valve Vi-enlargement 

42 V AC 

24 V DC 

Y6 Solenoid valve Vi-reduction 

220 V AC, expl.-proof 

OIL MANAGEMENT VERSIONS 

Depending on the case of operation of the compressor and on the design of the screw compressor package different 

oil management versions are used. 

Case of operation and design of the screw compressor package could be: Mono, dual, two-stage classification in 

combination with external or internal oil pump. Further applications and combinations are possible. 

fig. 26: Oil management versions, Types C, D, E, G 

The description of the connections can be found in table page 85. 


23.03.2012




SCHEMATIC DIAGRAM, CONNECTIONS; FRAME SIZES H, L, M, N 

16.2 FRAME SIZES H, L, M, N 

P+I DIAGRAMM 

Hint! 







compressor. 

The pertaining piping diagram of the screw compressor is part of the documentation and will be 


The following interior pipe schematic for the screw compressor applies for standard usage in single phase highpressure 

operations with fixed interior Vi. P+I diagrams are available for connecting the package oil circuit to the 

compressor, which will be determined based on the usage of the machines and have special labels. 

INTERNAL OIL PASSAGE 

fig. 27: Internal oil passage (compressor sectional view), Types H, L, M, N. 


*) only for type M, N 


23.03.2012





fig. 28: Internal oil passage, Types H, L, M, N 



23.03.2012





CONNECTIONS sizes H, L 

fig. 29: Connections sizes H, L 



23.03.2012






Port 

Purpose 


H / L 

A 

B 



DN 125 

M16 x 27 

DN 80 

M16 x 25 

C1 Functional oil M22 x 1,5 


D Oil injection compression chamber M22 x 1,5 

E Oil supply capacity control from oil pump G ¼ 

F Economizer M42 x 2 

G1 Refrigerant injection (LP) M16 x 1,5 

G2 Refrigerant injection (HP) M16 x 1,5 

H Gas pulsation protection M16 x 1,5 

K Additional oil injection M12 x 1,5 

L Suction pressure M16 x 1,5 

M Oil return oil separator M16 x 1,5 

N Measure discharge pressure G ¼ 

O Purge valve (Valve 105) M16 x 1,5 

P Discharge temperature M12 x 1,5 

R Overflow valve connection DN 80 

S Pressure oil pump G ¼ 

V Additional connection suction side, behind filter M16 x 1,5 

W1 Oil drain plug M12 x 1,5 



X Vibration damper for the suction side check valve - 

Z1 Additional connection M16 x 1,5 




23.03.2012





CONNECTION Sizes M, N 

fig. 30: Connection, sizes M, N 



23.03.2012






Port 

Purpose 

Nominal cross section / thread 

M / N 

A 

B 



DN 150 

M20 x 28 

DN 100 

M20 x 30 



D Oil injection compression chamber M26x1,5 

E Oil supply capacity control from oil pump G ¼ 

F Economizer M48 x 2 

G1 Refrigerant injection (LP) M22 x 1,5 

G2 Coolant injection (HP) M22 x 1,5 

H Gas pulsation protection M22 x 1,5 

K Additional oil injection M16 x 1,5 

L Suction pressure M16 x 1,5 

M Oil return oil separator M16 x 1,5 

N Measure discharge pressure G ¼ 

O Purge valve (Valve 105) M16 x 1,5 

P Discharge temperature M12 x 1,5 

R Overflow valve connection DN 80 

S Pressure oil pump G ¼ 

V Additional connection suction side, behind filter M16 x 1,5 




X Vibration damper for the suction-side non-return valve - 





23.03.2012







U1 Position sensor (452): Position Display of the Control Slide 24 V (DC) 4 - 20 mA 

U2 Position sensor (452): Vi slide position display 24 V (DC) 4 - 20 mA 



110 V/ 115 V AC 

48 V AC 

Y5 Solenoid valve Vi-enlargement 

42 V AC 

24 V DC 

Y6 Solenoid valve Vi-reduction 



23.03.2012




SCHEMATIC DIAGRAM, CONNECTIONS; SIZES P; R, S, T; V, W, Y 

16.3 SIZES P; R, S, T; V, W, Y 

P+I DIAGRAMM 

Hint! 







compressor. 



P+I diagrams are available for connecting the package oil circuit to the compressor, which will be determined 

based on the usage of the machines and have special labels. 


23.03.2012





CONNECTIONS 

fig. 31: Connections, Type P 



23.03.2012






Port 

Purpose 

Nominal width / threads 

P 

S 

T 

A 



Oil-supply shaft seal, 

suct. side bearing 

DN 150 

M24 x 30 

DN 100 

M16 x 22 

M22 x 1,5 

B Oil injection compression chamber M22 x 1,5 

B1 Additional oil injection compression chamber male rotor side - 

C Oil-supply discharge side bearing, balance piston M22 x 1,5 

C1 Special port axial bearing female rotor - 

D Oil-supply balance piston heat pump M22 x 1,5 

D1 Special port axial bearing male rotor M22 x 1,5 

E External oil-supply solenoid valve block for capacity control G ¼ 

F Additional oil injection, Special oil injection suction housing M22 x 1,5 

G Special oil injection suction housing M22 x 1,5 

H0 Refrigerant liquid injection (Suction pressure) - 

H1 Refrigerant liquid injection (Low pressure) M22 x 1,5 

H2 Refrigerant liquid injection (High pressure) - 

L Oil drain plug M16 x 1,5 

M Oil drain plug M22 x 1,5 

N Oil return oil separator M16 x 1,5 

P Gas pulsation protection M26 x 1,5 

R 

Economizer port female rotor 

DN 40 

M12 x 25 

R1 Economizer port, male rotor - 

VS Vibration sensor connection ¼ “ -28 UNF x 10 

O1 Oil drain plug M14 x 1,5 

O2 Oil drain plug M22 x1,5 



23.03.2012





fig. 32: Connections, Type R, S, T 



23.03.2012






Port 

Purpose 


R, S, T 

S 

T 

A 





DN 175 

M20 x 30 

DN 100 

M16 x 33 

M22 x 1,5 


B1 Additional oil injection compression chamber male rotor side - 


C1 Special port axial bearing female rotor M22 x 1,5 





G Special oil injection suction housing M22 x 1,5 

H0 Refrigerant liquid injection (Suction pressure) - 


H2 Refrigerant liquid injection (High pressure) M22 x 1,5 

L Oil drain plug M12 x 1,5 

M Oil drain plug M12 x 1,5 


P Gas pulsation protection M26 x 1,5 

R 


DN 40 

M12 x 25 

R1 Economizer port, male rotor - 






23.03.2012





fig. 33: Connections, Type V, W, Y 



23.03.2012






Port 

Purpose 


V, W, Y 

S 

T 

A 





DN 250 

M20 x 30 

DN 150 

M20 x 28 

M22 x 1,5 


B1 Additional oil injection compression chamber male rotor side M26 x 1,5 







G Special oil injection suction housing - 

H0 Refrigerant liquid injection (Suction pressure) M22x1,5 



L Oil drain plug - 

M Oil drain plug - 


P 

R 

R1 

Gas pulsation protection 


Economizer port, male rotor 

DN 25 

Pipe Ø 28 mm 

M10 x 20 

DN 65 

M16 x 30 

DN 65 

M16 x 30 






23.03.2012







Z Position sensor: Position display control slide (primary slide) 24 V (DC) 4 - 20 mA 

Z1 Position sensor: Position display secondary slide 24 V (DC) 4 - 20 mA 



110 V/ 115 V AC 

48 V AC 

Y5 Solenoid valve variable Vi 

42 V AC 

24 V DC 




23.03.2012




SCHEMATIC DIAGRAM, CONNECTIONS; SIZES Z, XA XB, XC, XD; XE, XF 

16.4 SIZES Z, XA XB, XC, XD; XE, XF 

P+I DIAGRAMM 

Hint! 







compressor. 



P+I diagrams are available for connecting the package oil circuit to the compressor, which will be determined 

based on the usage of the machines and have special labels. 


23.03.2012





CONNECTION Size Z 

fig. 34: Type Z 



23.03.2012





PIPE PORT / THREAD Size Z 

Port 

Purpose 


Z 

S 

T 



DN 250 

M20 x 45 

DN 150 

M20 x 30 

A Oil-supply shaft seal, suction side bearing M22 x 1,5 


B1 Additional oil injection compression chamber male rotor side M26 x 1,5 





E External oil-supply solenoid valve block for capacity control G 1/4 

F Special oil injection suction housing M22 x 1,5 

F1 Special oil injection suction housing - 

H0 Refrigerant liquid injection (Suction pressure) M22 x 1,5 

H1 Refrigerant injection (intermediate pressure) M22 x 1,5 

H2 Coolant injection (High pressure) M22 x 1,5 


P 

R 

R1 




DN 25 

Pipe Ø 28 mm 

M10 x 30 

DN 100 

M16 x 30 

DN 100 

M16 x 30 



VS Vibration sensor connection ¼ “ – 28 UNF x 8 


23.03.2012





CONNECTIONS Size XA 

fig. 35: Type XA 



23.03.2012





PIPE PORT/ THREAD Size XA 

Port 

Purpose 


XA 

S 

T 



DN 250 

M20 x 45 

DN 150 

M20 x 30 


B Oil injection compression chamber M33 x 2 

B1 Additional oil injection compression chamber male rotor side M33 x 2 









H1 Coolant injection (intermediate pressure) M22 x 1,5 



P 

R 

R1 




DN 25 

Pipe Ø 28 mm 

M10 x 30 

DN 100 

M16 x 30 

DN 100 

M16 x 30 





23.03.2012





PIPE CONNECTION / THREAD Size XB, XC, XD 

fig. 36: Types XB, XC, XD 



23.03.2012





PIPE PORT/ THREAD Size XB, XC, XD 

Port 

Purpose 


XB, XC, XD 

S 

T 



DN 300 

M20 x 50 

DN 200 

M20 x 32 


B 

B1 

Oil injection compression chamber 

Additional oil injection compression chamber male rotor side 

DN 50 

Pipe Ø 63 

M16 x 35 

DN 50 

Pipe Ø 63 

M16 x 35 







F1 Special oil injection suction housing M33 x 2 


H1 Coolant injection (intermediate pressure) M26 x 1,5 



P 

R 

R1 




DN 35 

Pipe Ø 35 mm 

M16 x 35 

DN 125 

Pipe Ø 140 mm 

M20 x 40 

DN 125 


M20 x 40 

O1 Oil drain plug M22 X 1,5 




23.03.2012





PIPE CONNECTION / THREAD Size XE, XF 

fig. 37: Types XE, XF 

The description of the connections are shown on tables on page 111 and page 113. 


23.03.2012





PIPE PORT/ THREAD Size XE, XF 

Port 

Purpose 



S 

T 



DN 400 

Pipe Ø 412 

M24 x 48 

DN 250 

Pipe Ø 273 

M24 x 32 


B 

B1 

Oil injection compression chamber 

Additional oil injection compression chamber male rotor side 

DN 50 

Pipe Ø 63 

M16 x 34 

DN 50 

Pipe Ø 63 

M16 x 34 








H0 

H1 

H2 

Refrigerant liquid injection (Suction pressure) 

Coolant injection (intermediate pressure) 

Refrigerant liquid injection (High pressure) 

DN 25 

Pipe Ø 28 mm 

M16 x 34 

DN 25 

Pipe Ø 28 mm 

M16 x 34 

DN 25 

Pipe Ø 28 mm 

M16 x 34 


P 

R 



DN 80 

Pipe Ø 80 

M16 x 30 

DN 150 


M16 x 30 


23.03.2012





Port 

Purpose 



R1 


DN 150 


M16 x 30 





23.03.2012







Z Position sensor: Position display control slide (primary slide) 24 V (DC) 4 - 20 mA 

Z1 Position sensor: Position display secondary slide 24 V (DC) 4 - 20 mA 



110 V/ 115 V AC 

48 V AC 


42 V AC 

24 V DC 




23.03.2012

GEA Refrigeration Technologies 

GEA Refrigeration Germany GmbH 

Holzhauser Strasse 165 • 13509 Berlin • Germany 

Phone +49 30 43 592 6 • Fax +49 30 43 592 777 

gea-refrigeration.de@geagroup.com 

www.gearefrigeration.com

Grasso Screw compressors Types C ... XF Product Information - GEA ...

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?