Cheetah fan coil unit brochure - Caice

Manufactured in the UK by Caice
Cheetah Modular
Acoustic Fan Coil Unit
Brochure
Horizontal Waterside Control Fan Coil Units
Model 200 — AC Range
Model 300 — EC Range
17th August 2012

Contents
Introduction 1
Typical Modular Concept 2
Range Overview and Component Codes 5
Range Dimensions 6
Typical Performance Data 8
Acoustic Data 10
Acoustic Assessment 14
Commissioning 15
Specification 16
Building Regulation Compliance 17
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Introduction
Modular Fan Coil Units
Following an extensive program of Research and Development, CAICE are proud to introduce the new Cheetah Modular Acoustic
Fan Coil Unit (FCU) range which offers a low-noise and compact yet powerful air-conditioning solution. Starting with a core unit, the
modular concept allows the FCU to be built up by adding components as required, including integral attenuation, so that the target NR
levels can be achieved.
Another of the real advantages of our new modular concept is the possibility of huge savings for our clients by allowing for easy
design redevelopment at any stage of a project. This is especially true during the fit-out stage where space usage can change and
noise criteria can be reduced to accommodate meeting rooms, conference areas etc.
In addition to the modular concept, we have also enhanced our acoustic design software to predict resultant room noise levels more
accurately than ever before. CAICE continue to set the pace in the high performance Acoustic FCU market.
The model 200 and 300 AC and EC range are designed for use in ceiling or floor void applications and besides having an enviable list
of features, they also allow for easy installation and simple maintenance.
Features
Modular Concept
Acoustic
Core FCU
Choice of inlet and discharge plenums
Range of inlet and discharge attenuation
Configuration changes are made easy
Published test data to BS 4856
Noise prediction software
Guaranteed NR levels
Controls
Maintenance
BMS compatible
0-10V infinitely variable controller on EC models
Multi-speed selector switches on AC models
24V transformer for powering thermal controls (EC & AC)
Accepts most proprietary intelligent controllers
Individual fan / motor assemblies for ease of replacement
Wire framed washable filter
Replaceable drain trays and heat exchanger
Replaceable control boxes
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1

Typical Modular Concept
Inlet Side Components
In board filter with underside
access and Return air plenum
for fully ducted systems
Fresh air plenum with
standard filter fitted
Core FCU (normally with
standard filter fitted but
omitted here for clarity)
300mm, 600mm or 900mm
inlet attenuator
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Typical Modular Concept
Discharge Side Components
Extended Prestige discharge
plenum incorporating
additional 300mm or 600mm of
attenuation.
Standard Prestige
discharge plenum
Core unit with standard
discharge plenum
250mm or 315mm
drop discharge
plenum
300mm, 600mm or 900mm
discharge attenuator
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3

Typical Modular Concept
Typical NR35 / 38 Office FCU
Typical NR35 / 38 Office FCU (with attenuator)
Core FCU with G2 filter
Inlet attenuator with G2 filter
Standard discharge plenum (200mm spigot connections)
Core FCU
Standard discharge plenum (200mm spigot connections)
Typical NR30 Office / Meeting Room FCU
Inlet attenuator with G2 filter
Typical NR25 / 30 Prestige FCU
Core FCU with G2 filter
Core FCU
Attenuated rectangular discharge plenum
Discharge attenuator
Drop discharge plenum (250mm spigot connections)
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Range Overview and Component Codes
Models
0 Vertical AC Unit
1 Vertical EC Unit
2 Horizontal AC Unit
3 Horizontal EC Unit
Discharge Configuration
C Core Unit only
0 Core Unit + plenum with Ø200mm spigots
5 Core Unit + plenum with Ø250mm spigots
8 Core Unit + plenum with Ø315mm spigots
3 Prestige rectangular
1 Rectangular (vertical units)
FCU Size
Coil Operating Mode
1 1-fan unit
B Heating and cooling
2 2-fan unit
C Cooling only
3 3-fan unit
H Heating only
4 4-fan unit
5 5-fan unit
Inlet Plenum Options
G Fresh air - unlined
H Fresh air - lined
I 200mm spigot return air - unlined
J 250mm spigot return air - unlined
K 315mm spigot return air - unlined
L 200mm spigot return air - lined
M 250mm spigot return air - lined
N 315mm spigot return air - lined
Controls
A Standard Speed Control
B Free Issue Heating or Cooling only
C Free Issue Heating or Cooling
D Stand Alone Heating or Cooling only
E Stand Alone Heating or Cooling
2 0 1 B / 3 6 / B 5 N F P T Y E W / A X
FCU Configuration
B Basic waterside
U Uncased (chassis) waterside
C Cased waterside
Inlet attenuator
3 300mm
6 600mm
9 900mm
Coil Style
3 3-row
4 4-row
5 5-row
Discharge attenuator
3 300mm
6 600mm
9 900mm
Options
F Filter extension
P Standard condensate pump
T Traffolyte label
Y Painted drain tray
E Electric heater
S Peristaltic condensate pump
W Shrink wrap
Special Features
X Denotes any special features
Note: The above codes cover our vertical FCU range, details available on request
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5

WIDTH
235
A B A
WIDTH
A B A
285
235
Range Dimensions
FCU Range
Size
Width
(mm)
No. Of
Spigots
200 & 250 Spigot
Centres (mm)
315 Spigot
Centres (mm)
A B A B
1 602 3 301 - 301 -
2 952 4 276 400 276 400
3 1252 5 276 350 276 350
4 1552 6 176 400 251 350
5 1902 6 201 500 276 450
Modular Units
Module
Length (mm)
Fresh Air Plenum 250 (260)
Return Air Plenum (with filter) 270 (280), 320 (330), 385 (395)
Inlet Attenuator (with filter) 300 (310), 600 (610), 900 (910)
Core FCU (with filter) 475 (485)
Discharge attenuator 300, 600, 900
Discharge standard (200mm) plenum 270
Discharge drop (250mm) plenum 320
Discharge drop (315mm) plenum 385
Notes:
1. Pipe connections 15mm for both heating and cooling.
Prestige rectangular discharge
attenuated plenum
Inboard filter with underside access for
fully ducted systems
270, 570, 870
65
2. Left hand coil connection shown (right hand also
available) viewed from below in the direction of airflow.
Electric heater (with filter) 300 (310)
Typical NR35 / 38 Office FCU
Typical NR30 Office / Meeting Room FCU
55
365
55
55
55
121
35 247
146
35 247
49
270
475
10
49
320
300
475
300
10
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235
173
235
WIDTH
185
12
WIDTH
235
235
WIDTH
755
Optional discharge
attenuator
289
427
Range Dimensions
39
12
Optional inlet
attenuator
4-of f hanging positions
300mm or
600mm
Fixing holes
Prestige FCU with Rectangular Discharge
AIRFLOW
Prestige FCU’s are suitable for any scenario where a
rectangular discharge connection is required, such as in hotels
residential apartments or an office reception area etc.
Prestige units have special acoustic linings fitted into the
discharge plenums, which reduce noise levels. See the Acoustic
Data section of this brochure for the noise reduction
performance of these linings.
120
Additional attenuation can be provided where required using the
modular rectangular Fan speed inlet controller attenuators and extended length
discharge plenums.
Coil drain tray
40
Fixing holes
22mm plain drain
connection
Typical Hotel NR25 / 30 FCU
300mm or
600mm
55 55
Size Width W1
1 602 532
2 952 882
3 1252 1182
282 252 Fan access panel
4 1552 1482
5 1902 1832
35 247
END ELEVATION ON FAN COIL UNIT DISCHARGE
270
475
10
35 W1 Opening 35
Notes:
M8 nutserts to suit
30mm Doby /Mez f lange
Internal acoustic lining
Additional central nutsert on
233/333 units and abov e
1. Left hand coil connection shown (right hand also
available) viewed from below in the direction of airflow.
Typical Module Corner Unit Support
55
Each module has common drop rod placement holes pre-drilled
as shown for easy on-site installation.
Note: Inlet filter not shown.
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7

Typical Performance Data
Performance Criteria
Electrical supply
230V, 1ph, 50Hz
Cooling air on temp db 23°C
Cooling air on % RH 50%
Chilled water flow temp 6°C
Chilled water return temp 12°C
Heating air on temp 20°C
LPHW flow temp 82°C
LPHW return temp 71°C
External static pressure 30 Pa
Size
1
2
3
4
5
Guide NR
Level
Air Flow
(l/s)
AC Version
SFP (W/l/s) Air Off 11°C Air Off 12°C Air Off 35°C
EC Version
Total
Cooling
Duty (kW)
Sensible
Cooling
Duty (kW)
Total
Cooling
Duty (kW)
Sensible
Cooling
Duty (kW)
Heating
Duty (kW)
33 107 0.77 0.31 1.84 1.53 1.69 1.40 1.94
34 114 0.82 0.32 1.96 1.63 1.80 1.50 2.06
35 130 0.81 0.35 2.22 1.86 2.04 1.71 2.35
35 140 0.84 0.37 2.40 2.01 2.19 1.84 2.53
30 155 0.79 0.25 2.69 2.22 2.47 2.04 2.81
32 185 0.79 0.26 3.19 2.65 2.93 2.43 3.35
35 235 0.80 0.30 4.03 3.37 3.70 3.09 4.26
39 280 0.85 0.35 4.78 4.02 4.38 3.68 5.07
30 202 0.77 0.25 3.52 2.90 3.22 2.65 3.66
32 235 0.77 0.26 4.07 3.37 3.73 3.09 4.26
35 297 0.82 0.28 5.10 4.26 4.69 3.91 5.38
37 330 0.83 0.30 5.65 4.73 5.18 4.34 5.98
41 402 0.85 0.36 6.85 5.77 6.28 5.29 7.28
29 227 0.77 0.25 3.96 3.25 3.63 2.98 4.11
31 277 0.74 0.23 4.80 3.97 4.41 3.64 5.02
34 369 0.76 0.24 6.34 5.29 5.81 4.85 6.69
35 398 0.79 0.26 6.83 5.71 6.27 5.24 7.21
39 477 0.86 0.32 8.13 6.84 7.47 6.28 8.64
32 384 0.77 0.26 6.65 5.51 6.09 5.05 6.96
33 430 0.79 0.28 7.42 6.17 6.80 5.66 7.79
34 483 0.81 0.30 8.30 6.93 7.61 6.35 8.75
Guide NR levels are not applicable for Prestige units, please see page 13 for further details.
Data above based on 4-row coil option.
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Typical Performance Data
Performance Criteria
Electrical supply
230V, 1ph, 50Hz
Cooling air on temp db 23°C
Cooling air on % RH 50%
Chilled water flow temp 5°C
Chilled water return temp 11°C
Heating air on temp 20°C
LPHW flow temp 82°C
LPHW return temp 71°C
External static pressure 30 Pa
Size
1
2
3
4
5
Guide NR
Level
Air Flow
(l/s)
AC Version
SFP (W/l/s) Air Off 11°C Air Off 12°C Air Off 35°C
EC Version
Total
Cooling
Duty (kW)
Sensible
Cooling
Duty (kW)
Total
Cooling
Duty (kW)
Sensible
Cooling
Duty (kW)
Heating
Duty (kW)
33 107 0.77 0.31 1.91 1.53 1.75 1.40 1.94
34 114 0.82 0.32 2.03 1.63 1.87 1.50 2.06
35 130 0.81 0.35 2.31 1.86 2.12 1.71 2.35
35 140 0.84 0.37 2.49 2.01 2.28 1.84 2.53
30 155 0.79 0.25 2.79 2.22 2.57 2.04 2.81
32 185 0.79 0.26 3.32 2.65 3.04 2.43 3.35
35 235 0.80 0.30 4.19 3.37 3.84 3.09 4.26
39 280 0.85 0.35 4.97 4.02 4.55 3.68 5.07
30 202 0.77 0.25 3.65 2.90 3.34 2.65 3.66
32 235 0.77 0.26 4.22 3.37 3.87 3.09 4.26
35 297 0.82 0.28 5.30 4.26 4.87 3.91 5.38
37 330 0.83 0.30 5.87 4.73 5.39 4.34 5.98
41 402 0.85 0.36 7.00 5.67 6.53 5.29 7.28
29 227 0.77 0.25 4.11 3.25 3.76 2.98 4.11
31 277 0.74 0.23 4.99 3.97 4.57 3.64 5.02
34 369 0.76 0.24 6.59 5.29 6.04 4.85 6.69
35 398 0.79 0.26 7.09 5.71 6.51 5.24 7.21
39 477 0.86 0.32 8.46 6.84 7.76 6.28 8.64
32 384 0.77 0.26 6.90 5.51 6.32 5.05 6.96
33 430 0.79 0.28 7.70 6.17 7.07 5.66 7.79
34 483 0.81 0.30 8.62 6.93 7.90 6.35 8.75
Guide NR levels are not applicable for Prestige units, please see page 13 for further details.
Data above based on 4-row coil option.
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9

Acoustic Data
Published Test Data
The data on the following pages has been derived from tests undertaken in accordance with BS 4856: Part 4: 1997 ‘Determination of
sound power levels of fan coil units, unit heaters and unit coolers using reverberation rooms’.
All published data has been tested at a third party acoustic test facility.
In accordance with BS 4856, a standard 200Ø spigotted FCU was mounted in Reverberation Room 1 then ducted with 1000mm long
solid circular galvanised sheet steel ducts to a dividing wall / plate and into Reverberation Room 2. It should be noted that if the solid
ducts are replaced by flexible ducts the discharge sound power levels (Lw) will reduce typically as per the table below:
Acoustic Reduction to Lw 125 250 500 1k 2k 4k 8k Hz
1000mm flexible duct 4 5 9 11 10 8 8 dB
Inlet/Radiated sound power levels were measured in reverberation room 1 while the discharge sound power levels were measured in
reverberation room 2.
Attenuator
Attenuator
Inlet
Air
Reverberation Room 1: Inlet
and Case Radiated Noise
Manometer to
measure external
static pressure across
fan coil unit
1m discharge duct on
each outlet spigot
Reverberation Room 2:
Discharge Noise Room
Discharge Air
Air damper to vary
external static
resistance across fan
coil unit
Average of several
sound pressure
measurements taken
in inlet and casing
breakout room
+ -
Fan coil unit
suspended from
support frame
Average of several
sound pressure
measurements taken
in discharge room
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Acoustic Data
Project Specified NR Levels
On all projects there will usually be a room NR level specified, and in some instances there may be limiting Inlet/Radiated and
Discharge sound power levels also stated within the specification applicable to the FCU.
CAICE FCU selection software uses typical installation parameters based on a horizontal FCU with 200Ø discharge ducts installed
within a ceiling void. This enables Guide NR Levels to be published in the Typical Performance Data, and also in any technical
schedule that may be issued when quoting a project.
Limiting Inlet/Radiated and Discharge sound power level data is the most accurate way of specifying the performance of a FCU, but
must be based on a detailed calculation model that uses all the project specific components and the installation design.
Guide NR Levels
Guide NR levels are based on a number of assumed parameters and a typical office installation. We have listed these parameters
below, but should it be considered that these parameters are not applicable for a particular application, then a detailed acoustic
assessment will be required.
Acoustic Loss Allowed 125 250 500 1k 2k 4k 8k Hz
Discharge ducts & 90° lined diffuser plenums (1) 9 13 17 20 20 20 14 dB
False Ceiling SRI (2) 9 8 12 18 22 23 22 dB
(1) Includes 1000mm long, 200mm dia flexible duct
(2) Ceiling performance based on Armstrong Supreme Ceiling Tiles
FCU Size
Room Size
Ceiling Height
Reverberation Time
(mid frequency)
1, 2 20m² 2.7m
0.35 s
3, 4 30m² 2.7m
0.45 s
5 56m² 2.7m
0.60 s
The Guide NR level assumes that a single FCU will be installed within a 600mm deep ceiling void above a room with the
aforementioned characteristics, and serving 1000 x 100mm slot diffusers with 50% free area.
A correction to the Guide NR level should be made where more than one unit is present in a room space.
Return air grilles should be located at least 1.5m from the fan coil inlet.
Limiting Air Velocities
In all cases, sufficient active spigots should be used to ensure maximum air velocities in the discharge ducts of 2.0m/s for Guide
NR30, and 3.0m/s for Guide NR35.
Acoustic Assessment
Published acoustic data can often be misinterpreted. It is therefore recommended that a detailed acoustic assessment should be
undertaken at an appropriate stage. Please refer to page 14 for more information on the services that CAICE can offer.
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11

Acoustic Data
Cheetah FCU with Circular Discharge
All the following data is based on the standard FCU core module with inlet filter fitted and a 200Ø discharge plenum.
AC / EC
Model
201 / 301
202 / 302
203 / 303
Air Flow
(l/s)
Ext Pressure
(pa)
107 30
114 30
130 30
140 30
155 30
185 30
235 30
280 30
202 30
235 30
297 30
330 30
402 30
Sound Power Levels (dB) at Mid Octave Band Frequencies (Hz)
125 250 500 1k 2k 4k 8k
Discharge 55 56 52 51 47 42 38
Inlet/Radiated 54 55 54 48 43 38 29
Discharge 55 57 53 51 48 43 40
Inlet/Radiated 55 56 55 49 44 39 31
Discharge 56 57 54 53 49 44 42
Inlet/Radiated 56 57 56 50 46 40 34
Discharge 58 57 55 54 51 46 45
Inlet/Radiated 57 56 57 51 47 42 36
Discharge 52 52 49 45 42 35 30
Inlet/Radiated 51 52 50 43 38 31 23
Discharge 54 54 51 49 46 40 34
Inlet/Radiated 53 54 53 46 41 35 26
Discharge 57 58 54 52 49 44 41
Inlet/Radiated 57 57 56 50 45 40 32
Discharge 59 60 56 55 52 48 46
Inlet/Radiated 59 60 58 52 48 43 37
Discharge 53 52 50 45 43 36 30
Inlet/Radiated 54 53 52 44 39 32 23
Discharge 55 54 52 47 45 38 33
Inlet/Radiated 56 55 53 45 41 35 25
Discharge 58 57 54 51 48 43 39
Inlet/Radiated 59 58 56 49 45 39 30
Discharge 59 59 55 53 50 45 42
Inlet/Radiated 60 59 57 50 47 42 33
Discharge 61 63 59 56 54 50 47
Inlet/Radiated 63 63 61 54 51 46 39
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Acoustic Data
AC / EC
Model
204 / 304
205 / 305
Air Flow
(l/s)
Ext Pressure
(pa)
227 30
277 30
369 30
398 30
477 30
384 30
430 30
483 30
Sound Power Levels (dB) at Mid Octave Band Frequencies (Hz)
125 250 500 1k 2k 4k 8k
Discharge 50 51 48 43 40 32 27
Inlet/Radiated 52 52 50 42 36 28 22
Discharge 52 53 50 46 43 36 29
Inlet/Radiated 54 54 52 44 38 31 23
Discharge 55 56 53 49 47 41 35
Inlet/Radiated 57 57 55 48 43 37 27
Discharge 57 57 54 51 48 43 38
Inlet/Radiated 58 58 56 49 44 38 29
Discharge 60 60 57 55 53 48 44
Inlet/Radiated 62 61 58 52 48 43 35
Discharge 54 55 53 48 46 39 32
Inlet/Radiated 58 57 54 47 42 35 24
Discharge 56 56 54 49 47 41 35
Inlet/Radiated 59 58 55 48 43 37 26
Discharge 58 58 55 51 49 43 38
Inlet/Radiated 61 59 56 49 45 39 29
Prestige FCU with Rectangular Discharge
Acoustic data is the same as for the Standard core FCU, except for the following:
1. Acoustic performance data is based on 20Pa external resistance, not 30 Pa.
2. Discharge sound power levels will be reduced by the following:
Frequency 125 250 500 1k 2k 4k 8k Hz
Sound power level reduction 1 2 2 4 8 6 4 dB
3. Should a guide NR level be required, then an acoustic assessment will be needed.
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13

Acoustic Assessment
Confidence in your design
Whatever the project, whether large or small, our overall aim is
to ensure that the selected FCUs will achieve the room noise
design criteria once installed. In order to achieve confidence in
your design, CAICE can offer a number of options, depending
on the individual project circumstances.
Guide NR Selection Approach
The most common way to select and schedule FCUs is to use
the guide NRs based on assumed acoustic performances in
association with cooling and heating performance requirements.
Although this is not as accurate as a detailed desktop acoustic
assessment, it allows the consultant or design contractor to
specify and schedule the FCUs that are likely to be required on
the project.
These schedules will enable pricing to be completed, however if
room noise levels need to be guaranteed, it is essential that a
detailed acoustic assessment is undertaken at a later stage.
Detailed Desktop Acoustic Assessment
The only way of ensuring that FCUs are correctly selected
acoustically for any project installation (be it general offices,
meeting areas, hotel rooms, apartments etc) is to undertake a
detailed desktop acoustic assessment. CAICE can provide this
service via one of two methods:
Option 1: The Acoustic Consultancy Approach
Lee Cunningham Partnership operates as an independent
acoustic consultancy. Detailed design information for the project
can be taken and modelled using noise prediction software,
resulting in limiting sound power level data for each particular
installation.
Once limited discharge and inlet/radiated sound power levels
have been derived, this information should be used within
proiect specifications to ensure that FCU manufacturers offer
acoustically compliant products.
Where early stage designs are undertaken, any assumed
acoustic performances of critical components such as the false
ceiling, diffuser plenums, length of flexible ducts, etc would also
be specified.
For advice and pricing please call 0844 847 5360 or visit the
website at www.lcpacoustics.co.uk for further information.
Option 2: The CAICE Design Approach
CAICE, in association with Lee Cunningham Partnership, have
an on-going research programme into the acoustics of FCUs
and other ceiling void mounted mechanical equipment. This has
resulted in CAICE having new acoustic modelling software,
enabling room noise levels to be predicted more accurately than
ever before.
This design service is normally available post-order, however an
initial pre-tender design review can be undertaken for projects
where CAICE can be specified on an equal and approved basis.
The following information would be required to accurately
complete a detailed desktop acoustic assessment:
Noise criteria
Mechanical services layout drawings
Dimensional data for room spaces and ceiling void depth
False ceiling construction and corresponding certified
sound reduction data
Details of chosen grilles, diffusers and plenums
Room finishes
Certified Testing
Depending on the confidence in the chosen FCU supplier,
Certified Testing can be undertaken to prove compliance with
the results of any detailed desktop acoustic assessment.
Certified testing on a sample unit can therefore be done in two
ways:
Option 1: Witnessing a sound power level test
For the designer to have absolute confidence in the FCU data,
we would recommend a witness test of sound power level
measurements at an independent test laboratory. This will
confirm the noise data claimed by the manufacturer against any
limiting sound power level specification. CAICE data is tested to
BS4856, thereby removing any potential uncertainty over the
accuracy of the claimed data.
Option 2: On-site mock-up test
This is the most reliable method for guaranteeing that room
noise design criteria will be met. The aim is to install the FCU in
a typical set-up, i.e. with all the other components to be used on
the project and system fully commissioned. The unit can then
be acoustically tested, enabling the acoustic calculation model to
be verified.
Mock-up tests in other locations are often suggested but in our
experience they rarely replicate the final on-site conditions, as it
is probable that one or more of the components such as the
room size, ceiling systems, the grilles etc will differ. Therefore
although they can give a good indication, it is always best to
organise an on-site mock up test where possible.
14
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Commissioning
Pre-Commissioning
The following points should be considered prior to any FCU
acoustic commissioning work:
Ensure a commissioning method statement is available.
Check central plant air supply system is properly
commissioned and balanced.
Ensure that ductwork joints are properly sealed.
The false ceiling installation is complete.
Ensure FCU’s are running at their correct design duties
and record the speed control set point for AC units or the
control voltage (0-10v dc) for EC units.
Filters are in place and clean.
FCU Commissioning
It is important to highlight that successfully commissioning a
FCU for airflow is not the same process as commissioning for
acoustics. Whereas CIBSE Guides permit air volume tolerances
of up to 10% over the design figure, this is not compatible with
acoustic design, where air volumes should not be above 2% of
design.
This is an important point to note, as this can affect the
commissioning procedure and associated costs incurred by the
specialist commissioning contractors.
Airflow Rate Commissioning guidelines
1. Background check (all FCU’s and other plant
equipment switched off)
2. AHU central plant on only
3. FCU equipment on only
4. AHU and FCU equipment on together
The consultant should then compare the spectral data to
the project design parameters.
If the noise level is too high then check the following
items as they can all have a significant impact on the
resultant noise level in the room:
1. Whether carpets and furnishings are part of the
specification and are they fitted
2. Is the room size the same as the manufacturer
designed against
3. Is the ceiling providing the attenuation quoted
Should the NR levels not be achieved, then additional
diagnostic testing will be required.
Lee Cunningham Partnership is the acoustic consultancy
division of CAICE and its staff are well qualified in acoustic
commissioning of fan coil units and fault diagnosis. They will be
happy to discuss any FCU noise design principles or acoustic
commissioning issues.
Switch on FCU and run for at least 20mins.
Air flow rate measurements should be made at each
discharge diffuser/grille using a suitable calibrated
instrument such as a balometer.
Obtain the flow rate tolerances from the designer.
If the air flow rates are outside the tolerance specified,
then the duct static resistances should be checked at
suitable locations using a Pitot tube.
Lee Cunningham Partnership
Acoustic Consultancy
Building Services Acoustics including Fan Coil
Unit Desktop Assessments and Commissioning
Surveys and Testing
Acoustic Commissioning guidelines
This should be carried out by a suitably qualified acoustic
consultant in approximately the following manner:
Architectural Acoustics
0118 918 6460 or visit www.lcpacoustics.co.uk
The consultant should use a Type 1 calibrated sound
level meter and measure noise for at least 10s in
representative areas of the room (not directly under a
grille) under the following conditions:
Further Information
Please see CIBSE publication TM43: Fan Coil Units.
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15

Specification
Chassis
All units are manufactured from galvanised sheet steel,
incorporating core unit and multi-spigotted or rectangular
discharge plenums as applicable. All edges are de-burred and
formed inwards to prevent exposure of bare metal. Coils are
mounted within condensate trays, extended under the control
valves and connections, with fall to drain to overcome a
maximum of 50 Pa inlet pressure. Available with top or bottom
access.
Fans and Motors
Fans are double inlet, double width, direct drive centrifugal type
with high efficiency, low noise forward curved galvanized steel
impellers. Fan scrolls are galvanized steel and all fan
assemblies are dynamically balanced in two planes according to
DIN ISO 1940.
AC motor variants have external rotor motors with Class 1
protection, Class B insulation and an IP44 rating. EC
(electronically commutated) motor variants have external rotor
motors and an IP42 rating. All motors operate from a
230v/1ph/50Hz supply, and have sealed for life, maintenance
free ball bearings with a life expectancy of 40,000 hours in
normal operation.
Heat Exchangers
Coils are manufactured from solid drawn copper tubes,
mechanically expanded onto aluminium fins with headers
suitable for 2 or 4 pipe systems, and tested up to 15 bar. All coils
are fitted with manual air vents. Coils are mounted within
condensate trays, extended under the control valves and
connections, with fall to drain.
Condensate Drain Trays
Drain trays are constructed from galvanized steel, with welded
corners painted with corrosion resistant zinc rich paint. The drain
trays are partially exposed to facilitate easy cleaning or
replacement on site if required. Optional polyester powder coat
finish can be provided if requested.
Filters
Standard filters are of the wire framed washable type with a
performance classification of up to G2 in accordance with
BSEN779. Enhanced filter performance of up to G3 can be
provided on request.
Insulation
Units are insulated throughout with up to 25mm open cell, Class
O acoustic and thermal insulation.
Controls
All units are fitted with a speed control box with illuminated ON/
OFF switch. The unit Control Box is ventilated and connected to
the side of unit via two locating screws. Wiring to the fan motors
is via either an IEC 320 kettle-plug type connection on AC
versions, or multiplug connections on EC versions, making all
control boxes easily replaceable if necessary.
A hinged Control Box lid is provided and pre-punched to accept
the mounting of most proprietary unit intelligent controllers. A 2
metre mains lead is supplied as standard with an IEC 320 kettleplug
type fitting for connection to the unit, terminating with three
tinned wire leads for connection to an adjacent fused spur.
Fan speed of AC motors is controlled via a multi-tapped
transformer directly wired to a 9 speed switch system located on
the unit Control Box. The transformer provides a nominal 24 volt
AC output for powering of associated control devices.
Fan speed of EC motors is controlled via a 0-10v dc signal,
which can be varied via a screw head adjuster accessible from
the outside of the control box. The control box may also be
configured to allow remote fan speed adjustment via an external
device (e.g. BMS system). A transformer provides a nominal 24
volt AC output for powering of associated control devices.
Attenuators
Attenuator sections are fitted with internal linings manufactured
from galvanised expanded steel mesh, and packed with
controlled density acoustic media (mineral wool), with fibreglass
tissue is bonded to the rear of the facing.
Plenums
Multi-spigotted plenums utilise galvanized steel circular spigots
attached using screw fixings. Where blanking plates are fitted in
place of circular splgots, these will have insulation to the rear.
Rectangular discharge plenums incorporate a duct connection
facility, and utilise acoustic elements to the same specification
as attenuators.
Condensate Pumps
Where fitted, condensate pump will be Little Giant EC-400.
Peristaltic pumps are available on request.
Electric Heaters
Where provided, electrical heaters will be via a finned heating
element with termination in a metal control box, with 2-stage
(low and high temperature) cut-outs. Other controls or interlock
devices may be required to comply with I.E.E. or other local
regulations.
16
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Building Regulation Compliance
A new version of Building Regulations Document L covering
Conservation of Fuel and Power became effective from April
2010. Fan coil unit projects submitted for planning after this date
must ensure that the units do not exceed a Specific Fan Power
Rating of 0.60 W/l/s.
HBWS 300 series EC fan coil units comply with this rating at all
duties, and generally fall below 0.40 W/l/s.
EMC Compliance
The 200 and 300 series fan coil units both meet the
requirements of the EMC emission and immunity regulations.
Harmonic filters are fitted to size 303 units and above to ensure
compliance.
AC to EC Comparison
The 200 and 300 series fan coil units are identical in almost
every aspect, except they utilise different types of fan and speed
control.
The 200 series incorporate AC fans with a 9 step transformer
speed controller, which is manually switched on site to set the
unit to the correct duty. Historically fan coil units have been
operated at a fixed duty but if the client does want to change
speed remotely then relays can be fitted accordingly.
The 300 series incorporate EC (electronically commutated) fans,
which have a built in AC to DC power converter. This means that
whilst the fan coil unit is still connected on site to a 230V AC
supply, the motor itself runs on DC power.
Although EC fans are currently more expensive than AC fans
they are between 50 to 70% more energy efficient when
providing the same duty. Therefore not only do they easily
comply with Document L, but running costs and payback periods
are reduced significantly.
The cooling performance for AC fan coil units is reduced due to
the heat generated by the fan motor. However EC fans
generate negligible heat as they waste less energy. A typical
saving of 60W per EC fan should therefore enable the designer
to save costs by selecting smaller chillers, pumps, pipework etc.
The reduction in heat also means that life expectancy for EC
fans is expected to be about double that for AC fans, which
improves whole life costing calculations.
The 300 series fan coil units are provided with a rotary speed
selector switch, which can be manually adjusted on site to set
the unit to the correct duty, in a similar fashion to the AC units.
However this switch can be easily bypassed so that the unit can
be infinitely speed controlled using an external 0-10V signal.
Many fan coil unit thermal controllers already have a spare 0-
10V output, which therefore opens up the option to control fan
speed directly from the BMS.
These features provide the client with even more energy saving
and control opportunities:
a. The units could be set back to a minimum duty when
areas are unoccupied, or thermal loads are low.
b. The units could be set to normal or boost duty as
occupancy or thermal loads increase.
c. The units could be switched on and off without
introducing relays, as a zero volt signal de-energizes the
fan. This could be undertaken by BMS, time clock, room
mounted control or a hotel booking system.
d. The fan speed signal could be used to identify when fans
have failed.
e. Where pressure fluctuations occur the fan speed could
be maintained to keep the volume constant, thereby self
balancing the fan coils in a building.
Summary of EC Features and Benefits
50 to 70% more energy efficient than AC units
Considerably reduced energy bills for occupiers
Easily comply with new Document L regulations
Minimal heat pick up from motors helps to reduce
building cooling loads, associated equipment costs and
running costs
Infinitely variable speed control available via BMS using 0
-10V DC signal
Further energy savings if BMS is used to set units to
minimal duty during low occupancy or thermal load
periods
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17

© CAICE Acoustic Air Movement Ltd 2011 Due to our policy of continuous product development CAICE reserve the right to alter specifications without prior notice.
Telephone
0118 918 6470
Facsimile
0118 918 6480
enquiries@caice.co.uk
www.caice.co.uk
CAICE Acoustic Air Movement
Ltd.
Riverside House
3 Winnersh Fields
Gazelle Close
Winnersh
Wokingham