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

PRODUCT INFORMATION
GRASSO SCREW COMPRESSORS
Types C ... XF
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.
18 _101011_pi_sc_gbr_2_.doc GEA Refrigeration Germany GmbH
23.03.2012