Cheetah fan coil unit brochure - Caice
Cheetah fan coil unit brochure - Caice
Cheetah fan coil unit brochure - Caice
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Manufactured in the UK by <strong>Caice</strong><br />
<strong>Cheetah</strong> Modular<br />
Acoustic Fan Coil Unit<br />
Brochure<br />
Horizontal Waterside Control Fan Coil Units<br />
<br />
<br />
Model 200 — AC Range<br />
Model 300 — EC Range<br />
17th August 2012
Contents<br />
Introduction 1<br />
Typical Modular Concept 2<br />
Range Overview and Component Codes 5<br />
Range Dimensions 6<br />
Typical Performance Data 8<br />
Acoustic Data 10<br />
Acoustic Assessment 14<br />
Commissioning 15<br />
Specification 16<br />
Building Regulation Compliance 17<br />
i<br />
www.caice.co.uk
Introduction<br />
Modular Fan Coil Units<br />
Following an extensive program of Research and Development, CAICE are proud to introduce the new <strong>Cheetah</strong> Modular Acoustic<br />
Fan Coil Unit (FCU) range which offers a low-noise and compact yet powerful air-conditioning solution. Starting with a core <strong>unit</strong>, the<br />
modular concept allows the FCU to be built up by adding components as required, including integral attenuation, so that the target NR<br />
levels can be achieved.<br />
Another of the real advantages of our new modular concept is the possibility of huge savings for our clients by allowing for easy<br />
design redevelopment at any stage of a project. This is especially true during the fit-out stage where space usage can change and<br />
noise criteria can be reduced to accommodate meeting rooms, conference areas etc.<br />
In addition to the modular concept, we have also enhanced our acoustic design software to predict resultant room noise levels more<br />
accurately than ever before. CAICE continue to set the pace in the high performance Acoustic FCU market.<br />
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<br />
of features, they also allow for easy installation and simple maintenance.<br />
Features<br />
Modular Concept<br />
Acoustic<br />
<br />
<br />
<br />
<br />
Core FCU<br />
Choice of inlet and discharge plenums<br />
Range of inlet and discharge attenuation<br />
Configuration changes are made easy<br />
Published test data to BS 4856<br />
<br />
<br />
Noise prediction software<br />
Guaranteed NR levels<br />
Controls<br />
Maintenance<br />
<br />
<br />
<br />
<br />
<br />
BMS compatible<br />
0-10V infinitely variable controller on EC models<br />
Multi-speed selector switches on AC models<br />
24V transformer for powering thermal controls (EC & AC)<br />
Accepts most proprietary intelligent controllers<br />
<br />
<br />
<br />
<br />
Individual <strong>fan</strong> / motor assemblies for ease of replacement<br />
Wire framed washable filter<br />
Replaceable drain trays and heat exchanger<br />
Replaceable control boxes<br />
www.caice.co.uk<br />
1
Typical Modular Concept<br />
Inlet Side Components<br />
In board filter with underside<br />
access and Return air plenum<br />
for fully ducted systems<br />
Fresh air plenum with<br />
standard filter fitted<br />
Core FCU (normally with<br />
standard filter fitted but<br />
omitted here for clarity)<br />
300mm, 600mm or 900mm<br />
inlet attenuator<br />
2<br />
www.caice.co.uk
Typical Modular Concept<br />
Discharge Side Components<br />
Extended Prestige discharge<br />
plenum incorporating<br />
additional 300mm or 600mm of<br />
attenuation.<br />
Standard Prestige<br />
discharge plenum<br />
Core <strong>unit</strong> with standard<br />
discharge plenum<br />
250mm or 315mm<br />
drop discharge<br />
plenum<br />
300mm, 600mm or 900mm<br />
discharge attenuator<br />
www.caice.co.uk<br />
3
Typical Modular Concept<br />
Typical NR35 / 38 Office FCU<br />
Typical NR35 / 38 Office FCU (with attenuator)<br />
<br />
Core FCU with G2 filter<br />
<br />
Inlet attenuator with G2 filter<br />
<br />
Standard discharge plenum (200mm spigot connections)<br />
<br />
Core FCU<br />
<br />
Standard discharge plenum (200mm spigot connections)<br />
Typical NR30 Office / Meeting Room FCU<br />
<br />
Inlet attenuator with G2 filter<br />
Typical NR25 / 30 Prestige FCU<br />
<br />
Core FCU with G2 filter<br />
<br />
Core FCU<br />
<br />
Attenuated rectangular discharge plenum<br />
<br />
Discharge attenuator<br />
<br />
Drop discharge plenum (250mm spigot connections)<br />
4<br />
www.caice.co.uk
Range Overview and Component Codes<br />
Models<br />
0 Vertical AC Unit<br />
1 Vertical EC Unit<br />
2 Horizontal AC Unit<br />
3 Horizontal EC Unit<br />
Discharge Configuration<br />
C Core Unit only<br />
0 Core Unit + plenum with Ø200mm spigots<br />
5 Core Unit + plenum with Ø250mm spigots<br />
8 Core Unit + plenum with Ø315mm spigots<br />
3 Prestige rectangular<br />
1 Rectangular (vertical <strong>unit</strong>s)<br />
FCU Size<br />
Coil Operating Mode<br />
1 1-<strong>fan</strong> <strong>unit</strong><br />
B Heating and cooling<br />
2 2-<strong>fan</strong> <strong>unit</strong><br />
C Cooling only<br />
3 3-<strong>fan</strong> <strong>unit</strong><br />
H Heating only<br />
4 4-<strong>fan</strong> <strong>unit</strong><br />
5 5-<strong>fan</strong> <strong>unit</strong><br />
Inlet Plenum Options<br />
G Fresh air - unlined<br />
H Fresh air - lined<br />
I 200mm spigot return air - unlined<br />
J 250mm spigot return air - unlined<br />
K 315mm spigot return air - unlined<br />
L 200mm spigot return air - lined<br />
M 250mm spigot return air - lined<br />
N 315mm spigot return air - lined<br />
Controls<br />
A Standard Speed Control<br />
B Free Issue Heating or Cooling only<br />
C Free Issue Heating or Cooling<br />
D Stand Alone Heating or Cooling only<br />
E Stand Alone Heating or Cooling<br />
2 0 1 B / 3 6 / B 5 N F P T Y E W / A X<br />
FCU Configuration<br />
B Basic waterside<br />
U Uncased (chassis) waterside<br />
C Cased waterside<br />
Inlet attenuator<br />
3 300mm<br />
6 600mm<br />
9 900mm<br />
Coil Style<br />
3 3-row<br />
4 4-row<br />
5 5-row<br />
Discharge attenuator<br />
3 300mm<br />
6 600mm<br />
9 900mm<br />
Options<br />
F Filter extension<br />
P Standard condensate pump<br />
T Traffolyte label<br />
Y Painted drain tray<br />
E Electric heater<br />
S Peristaltic condensate pump<br />
W Shrink wrap<br />
Special Features<br />
X Denotes any special features<br />
Note: The above codes cover our vertical FCU range, details available on request<br />
www.caice.co.uk<br />
5
WIDTH<br />
235<br />
A B A<br />
WIDTH<br />
A B A<br />
285<br />
235<br />
Range Dimensions<br />
FCU Range<br />
Size<br />
Width<br />
(mm)<br />
No. Of<br />
Spigots<br />
200 & 250 Spigot<br />
Centres (mm)<br />
315 Spigot<br />
Centres (mm)<br />
A B A B<br />
1 602 3 301 - 301 -<br />
2 952 4 276 400 276 400<br />
3 1252 5 276 350 276 350<br />
4 1552 6 176 400 251 350<br />
5 1902 6 201 500 276 450<br />
Modular Units<br />
Module<br />
Length (mm)<br />
Fresh Air Plenum 250 (260)<br />
Return Air Plenum (with filter) 270 (280), 320 (330), 385 (395)<br />
Inlet Attenuator (with filter) 300 (310), 600 (610), 900 (910)<br />
Core FCU (with filter) 475 (485)<br />
Discharge attenuator 300, 600, 900<br />
Discharge standard (200mm) plenum 270<br />
Discharge drop (250mm) plenum 320<br />
Discharge drop (315mm) plenum 385<br />
Notes:<br />
1. Pipe connections 15mm for both heating and cooling.<br />
Prestige rectangular discharge<br />
attenuated plenum<br />
Inboard filter with underside access for<br />
fully ducted systems<br />
270, 570, 870<br />
65<br />
2. Left hand <strong>coil</strong> connection shown (right hand also<br />
available) viewed from below in the direction of airflow.<br />
Electric heater (with filter) 300 (310)<br />
Typical NR35 / 38 Office FCU<br />
Typical NR30 Office / Meeting Room FCU<br />
55<br />
365<br />
55<br />
55<br />
55<br />
121<br />
35 247<br />
146<br />
35 247<br />
49<br />
270<br />
475<br />
10<br />
49<br />
320<br />
300<br />
475<br />
300<br />
10<br />
6<br />
www.caice.co.uk
235<br />
173<br />
235<br />
WIDTH<br />
185<br />
12<br />
WIDTH<br />
235<br />
235<br />
WIDTH<br />
755<br />
Optional discharge<br />
attenuator<br />
289<br />
427<br />
Range Dimensions<br />
39<br />
12<br />
Optional inlet<br />
attenuator<br />
4-of f hanging positions<br />
300mm or<br />
600mm<br />
Fixing holes<br />
Prestige FCU with Rectangular Discharge<br />
AIRFLOW<br />
Prestige FCU’s are suitable for any scenario where a<br />
rectangular discharge connection is required, such as in hotels<br />
residential apartments or an office reception area etc.<br />
Prestige <strong>unit</strong>s have special acoustic linings fitted into the<br />
discharge plenums, which reduce noise levels. See the Acoustic<br />
Data section of this <strong>brochure</strong> for the noise reduction<br />
performance of these linings.<br />
120<br />
Additional attenuation can be provided where required using the<br />
modular rectangular Fan speed inlet controller attenuators and extended length<br />
discharge plenums.<br />
Coil drain tray<br />
40<br />
Fixing holes<br />
22mm plain drain<br />
connection<br />
Typical Hotel NR25 / 30 FCU<br />
300mm or<br />
600mm<br />
55 55<br />
Size Width W1<br />
1 602 532<br />
2 952 882<br />
3 1252 1182<br />
282 252 Fan access panel<br />
4 1552 1482<br />
5 1902 1832<br />
35 247<br />
END ELEVATION ON FAN COIL UNIT DISCHARGE<br />
270<br />
475<br />
10<br />
35 W1 Opening 35<br />
Notes:<br />
M8 nutserts to suit<br />
30mm Doby /Mez f lange<br />
Internal acoustic lining<br />
Additional central nutsert on<br />
233/333 <strong>unit</strong>s and abov e<br />
1. Left hand <strong>coil</strong> connection shown (right hand also<br />
available) viewed from below in the direction of airflow.<br />
Typical Module Corner Unit Support<br />
55<br />
Each module has common drop rod placement holes pre-drilled<br />
as shown for easy on-site installation.<br />
Note: Inlet filter not shown.<br />
www.caice.co.uk<br />
7
Typical Performance Data<br />
Performance Criteria<br />
Electrical supply<br />
230V, 1ph, 50Hz<br />
Cooling air on temp db 23°C<br />
Cooling air on % RH 50%<br />
Chilled water flow temp 6°C<br />
Chilled water return temp 12°C<br />
Heating air on temp 20°C<br />
LPHW flow temp 82°C<br />
LPHW return temp 71°C<br />
External static pressure 30 Pa<br />
Size<br />
1<br />
2<br />
3<br />
4<br />
5<br />
Guide NR<br />
Level<br />
Air Flow<br />
(l/s)<br />
AC Version<br />
SFP (W/l/s) Air Off 11°C Air Off 12°C Air Off 35°C<br />
EC Version<br />
Total<br />
Cooling<br />
Duty (kW)<br />
Sensible<br />
Cooling<br />
Duty (kW)<br />
Total<br />
Cooling<br />
Duty (kW)<br />
Sensible<br />
Cooling<br />
Duty (kW)<br />
Heating<br />
Duty (kW)<br />
33 107 0.77 0.31 1.84 1.53 1.69 1.40 1.94<br />
34 114 0.82 0.32 1.96 1.63 1.80 1.50 2.06<br />
35 130 0.81 0.35 2.22 1.86 2.04 1.71 2.35<br />
35 140 0.84 0.37 2.40 2.01 2.19 1.84 2.53<br />
30 155 0.79 0.25 2.69 2.22 2.47 2.04 2.81<br />
32 185 0.79 0.26 3.19 2.65 2.93 2.43 3.35<br />
35 235 0.80 0.30 4.03 3.37 3.70 3.09 4.26<br />
39 280 0.85 0.35 4.78 4.02 4.38 3.68 5.07<br />
30 202 0.77 0.25 3.52 2.90 3.22 2.65 3.66<br />
32 235 0.77 0.26 4.07 3.37 3.73 3.09 4.26<br />
35 297 0.82 0.28 5.10 4.26 4.69 3.91 5.38<br />
37 330 0.83 0.30 5.65 4.73 5.18 4.34 5.98<br />
41 402 0.85 0.36 6.85 5.77 6.28 5.29 7.28<br />
29 227 0.77 0.25 3.96 3.25 3.63 2.98 4.11<br />
31 277 0.74 0.23 4.80 3.97 4.41 3.64 5.02<br />
34 369 0.76 0.24 6.34 5.29 5.81 4.85 6.69<br />
35 398 0.79 0.26 6.83 5.71 6.27 5.24 7.21<br />
39 477 0.86 0.32 8.13 6.84 7.47 6.28 8.64<br />
32 384 0.77 0.26 6.65 5.51 6.09 5.05 6.96<br />
33 430 0.79 0.28 7.42 6.17 6.80 5.66 7.79<br />
34 483 0.81 0.30 8.30 6.93 7.61 6.35 8.75<br />
Guide NR levels are not applicable for Prestige <strong>unit</strong>s, please see page 13 for further details.<br />
Data above based on 4-row <strong>coil</strong> option.<br />
8<br />
www.caice.co.uk
Typical Performance Data<br />
Performance Criteria<br />
Electrical supply<br />
230V, 1ph, 50Hz<br />
Cooling air on temp db 23°C<br />
Cooling air on % RH 50%<br />
Chilled water flow temp 5°C<br />
Chilled water return temp 11°C<br />
Heating air on temp 20°C<br />
LPHW flow temp 82°C<br />
LPHW return temp 71°C<br />
External static pressure 30 Pa<br />
Size<br />
1<br />
2<br />
3<br />
4<br />
5<br />
Guide NR<br />
Level<br />
Air Flow<br />
(l/s)<br />
AC Version<br />
SFP (W/l/s) Air Off 11°C Air Off 12°C Air Off 35°C<br />
EC Version<br />
Total<br />
Cooling<br />
Duty (kW)<br />
Sensible<br />
Cooling<br />
Duty (kW)<br />
Total<br />
Cooling<br />
Duty (kW)<br />
Sensible<br />
Cooling<br />
Duty (kW)<br />
Heating<br />
Duty (kW)<br />
33 107 0.77 0.31 1.91 1.53 1.75 1.40 1.94<br />
34 114 0.82 0.32 2.03 1.63 1.87 1.50 2.06<br />
35 130 0.81 0.35 2.31 1.86 2.12 1.71 2.35<br />
35 140 0.84 0.37 2.49 2.01 2.28 1.84 2.53<br />
30 155 0.79 0.25 2.79 2.22 2.57 2.04 2.81<br />
32 185 0.79 0.26 3.32 2.65 3.04 2.43 3.35<br />
35 235 0.80 0.30 4.19 3.37 3.84 3.09 4.26<br />
39 280 0.85 0.35 4.97 4.02 4.55 3.68 5.07<br />
30 202 0.77 0.25 3.65 2.90 3.34 2.65 3.66<br />
32 235 0.77 0.26 4.22 3.37 3.87 3.09 4.26<br />
35 297 0.82 0.28 5.30 4.26 4.87 3.91 5.38<br />
37 330 0.83 0.30 5.87 4.73 5.39 4.34 5.98<br />
41 402 0.85 0.36 7.00 5.67 6.53 5.29 7.28<br />
29 227 0.77 0.25 4.11 3.25 3.76 2.98 4.11<br />
31 277 0.74 0.23 4.99 3.97 4.57 3.64 5.02<br />
34 369 0.76 0.24 6.59 5.29 6.04 4.85 6.69<br />
35 398 0.79 0.26 7.09 5.71 6.51 5.24 7.21<br />
39 477 0.86 0.32 8.46 6.84 7.76 6.28 8.64<br />
32 384 0.77 0.26 6.90 5.51 6.32 5.05 6.96<br />
33 430 0.79 0.28 7.70 6.17 7.07 5.66 7.79<br />
34 483 0.81 0.30 8.62 6.93 7.90 6.35 8.75<br />
Guide NR levels are not applicable for Prestige <strong>unit</strong>s, please see page 13 for further details.<br />
Data above based on 4-row <strong>coil</strong> option.<br />
www.caice.co.uk<br />
9
Acoustic Data<br />
Published Test Data<br />
The data on the following pages has been derived from tests undertaken in accordance with BS 4856: Part 4: 1997 ‘Determination of<br />
sound power levels of <strong>fan</strong> <strong>coil</strong> <strong>unit</strong>s, <strong>unit</strong> heaters and <strong>unit</strong> coolers using reverberation rooms’.<br />
All published data has been tested at a third party acoustic test facility.<br />
In accordance with BS 4856, a standard 200Ø spigotted FCU was mounted in Reverberation Room 1 then ducted with 1000mm long<br />
solid circular galvanised sheet steel ducts to a dividing wall / plate and into Reverberation Room 2. It should be noted that if the solid<br />
ducts are replaced by flexible ducts the discharge sound power levels (Lw) will reduce typically as per the table below:<br />
Acoustic Reduction to Lw 125 250 500 1k 2k 4k 8k Hz<br />
1000mm flexible duct 4 5 9 11 10 8 8 dB<br />
Inlet/Radiated sound power levels were measured in reverberation room 1 while the discharge sound power levels were measured in<br />
reverberation room 2.<br />
Attenuator<br />
Attenuator<br />
Inlet<br />
Air<br />
Reverberation Room 1: Inlet<br />
and Case Radiated Noise<br />
Manometer to<br />
measure external<br />
static pressure across<br />
<strong>fan</strong> <strong>coil</strong> <strong>unit</strong><br />
1m discharge duct on<br />
each outlet spigot<br />
Reverberation Room 2:<br />
Discharge Noise Room<br />
Discharge Air<br />
Air damper to vary<br />
external static<br />
resistance across <strong>fan</strong><br />
<strong>coil</strong> <strong>unit</strong><br />
Average of several<br />
sound pressure<br />
measurements taken<br />
in inlet and casing<br />
breakout room<br />
+ -<br />
Fan <strong>coil</strong> <strong>unit</strong><br />
suspended from<br />
support frame<br />
Average of several<br />
sound pressure<br />
measurements taken<br />
in discharge room<br />
10<br />
www.caice.co.uk
Acoustic Data<br />
Project Specified NR Levels<br />
On all projects there will usually be a room NR level specified, and in some instances there may be limiting Inlet/Radiated and<br />
Discharge sound power levels also stated within the specification applicable to the FCU.<br />
CAICE FCU selection software uses typical installation parameters based on a horizontal FCU with 200Ø discharge ducts installed<br />
within a ceiling void. This enables Guide NR Levels to be published in the Typical Performance Data, and also in any technical<br />
schedule that may be issued when quoting a project.<br />
Limiting Inlet/Radiated and Discharge sound power level data is the most accurate way of specifying the performance of a FCU, but<br />
must be based on a detailed calculation model that uses all the project specific components and the installation design.<br />
Guide NR Levels<br />
Guide NR levels are based on a number of assumed parameters and a typical office installation. We have listed these parameters<br />
below, but should it be considered that these parameters are not applicable for a particular application, then a detailed acoustic<br />
assessment will be required.<br />
Acoustic Loss Allowed 125 250 500 1k 2k 4k 8k Hz<br />
Discharge ducts & 90° lined diffuser plenums (1) 9 13 17 20 20 20 14 dB<br />
False Ceiling SRI (2) 9 8 12 18 22 23 22 dB<br />
(1) Includes 1000mm long, 200mm dia flexible duct<br />
(2) Ceiling performance based on Armstrong Supreme Ceiling Tiles<br />
FCU Size<br />
Room Size<br />
Ceiling Height<br />
Reverberation Time<br />
(mid frequency)<br />
1, 2 20m² 2.7m<br />
0.35 s<br />
3, 4 30m² 2.7m<br />
0.45 s<br />
5 56m² 2.7m<br />
0.60 s<br />
The Guide NR level assumes that a single FCU will be installed within a 600mm deep ceiling void above a room with the<br />
aforementioned characteristics, and serving 1000 x 100mm slot diffusers with 50% free area.<br />
A correction to the Guide NR level should be made where more than one <strong>unit</strong> is present in a room space.<br />
Return air grilles should be located at least 1.5m from the <strong>fan</strong> <strong>coil</strong> inlet.<br />
Limiting Air Velocities<br />
In all cases, sufficient active spigots should be used to ensure maximum air velocities in the discharge ducts of 2.0m/s for Guide<br />
NR30, and 3.0m/s for Guide NR35.<br />
Acoustic Assessment<br />
Published acoustic data can often be misinterpreted. It is therefore recommended that a detailed acoustic assessment should be<br />
undertaken at an appropriate stage. Please refer to page 14 for more information on the services that CAICE can offer.<br />
www.caice.co.uk<br />
11
Acoustic Data<br />
<strong>Cheetah</strong> FCU with Circular Discharge<br />
All the following data is based on the standard FCU core module with inlet filter fitted and a 200Ø discharge plenum.<br />
AC / EC<br />
Model<br />
201 / 301<br />
202 / 302<br />
203 / 303<br />
Air Flow<br />
(l/s)<br />
Ext Pressure<br />
(pa)<br />
107 30<br />
114 30<br />
130 30<br />
140 30<br />
155 30<br />
185 30<br />
235 30<br />
280 30<br />
202 30<br />
235 30<br />
297 30<br />
330 30<br />
402 30<br />
Sound Power Levels (dB) at Mid Octave Band Frequencies (Hz)<br />
125 250 500 1k 2k 4k 8k<br />
Discharge 55 56 52 51 47 42 38<br />
Inlet/Radiated 54 55 54 48 43 38 29<br />
Discharge 55 57 53 51 48 43 40<br />
Inlet/Radiated 55 56 55 49 44 39 31<br />
Discharge 56 57 54 53 49 44 42<br />
Inlet/Radiated 56 57 56 50 46 40 34<br />
Discharge 58 57 55 54 51 46 45<br />
Inlet/Radiated 57 56 57 51 47 42 36<br />
Discharge 52 52 49 45 42 35 30<br />
Inlet/Radiated 51 52 50 43 38 31 23<br />
Discharge 54 54 51 49 46 40 34<br />
Inlet/Radiated 53 54 53 46 41 35 26<br />
Discharge 57 58 54 52 49 44 41<br />
Inlet/Radiated 57 57 56 50 45 40 32<br />
Discharge 59 60 56 55 52 48 46<br />
Inlet/Radiated 59 60 58 52 48 43 37<br />
Discharge 53 52 50 45 43 36 30<br />
Inlet/Radiated 54 53 52 44 39 32 23<br />
Discharge 55 54 52 47 45 38 33<br />
Inlet/Radiated 56 55 53 45 41 35 25<br />
Discharge 58 57 54 51 48 43 39<br />
Inlet/Radiated 59 58 56 49 45 39 30<br />
Discharge 59 59 55 53 50 45 42<br />
Inlet/Radiated 60 59 57 50 47 42 33<br />
Discharge 61 63 59 56 54 50 47<br />
Inlet/Radiated 63 63 61 54 51 46 39<br />
12<br />
www.caice.co.uk
Acoustic Data<br />
AC / EC<br />
Model<br />
204 / 304<br />
205 / 305<br />
Air Flow<br />
(l/s)<br />
Ext Pressure<br />
(pa)<br />
227 30<br />
277 30<br />
369 30<br />
398 30<br />
477 30<br />
384 30<br />
430 30<br />
483 30<br />
Sound Power Levels (dB) at Mid Octave Band Frequencies (Hz)<br />
125 250 500 1k 2k 4k 8k<br />
Discharge 50 51 48 43 40 32 27<br />
Inlet/Radiated 52 52 50 42 36 28 22<br />
Discharge 52 53 50 46 43 36 29<br />
Inlet/Radiated 54 54 52 44 38 31 23<br />
Discharge 55 56 53 49 47 41 35<br />
Inlet/Radiated 57 57 55 48 43 37 27<br />
Discharge 57 57 54 51 48 43 38<br />
Inlet/Radiated 58 58 56 49 44 38 29<br />
Discharge 60 60 57 55 53 48 44<br />
Inlet/Radiated 62 61 58 52 48 43 35<br />
Discharge 54 55 53 48 46 39 32<br />
Inlet/Radiated 58 57 54 47 42 35 24<br />
Discharge 56 56 54 49 47 41 35<br />
Inlet/Radiated 59 58 55 48 43 37 26<br />
Discharge 58 58 55 51 49 43 38<br />
Inlet/Radiated 61 59 56 49 45 39 29<br />
Prestige FCU with Rectangular Discharge<br />
Acoustic data is the same as for the Standard core FCU, except for the following:<br />
1. Acoustic performance data is based on 20Pa external resistance, not 30 Pa.<br />
2. Discharge sound power levels will be reduced by the following:<br />
Frequency 125 250 500 1k 2k 4k 8k Hz<br />
Sound power level reduction 1 2 2 4 8 6 4 dB<br />
3. Should a guide NR level be required, then an acoustic assessment will be needed.<br />
www.caice.co.uk<br />
13
Acoustic Assessment<br />
Confidence in your design<br />
Whatever the project, whether large or small, our overall aim is<br />
to ensure that the selected FCUs will achieve the room noise<br />
design criteria once installed. In order to achieve confidence in<br />
your design, CAICE can offer a number of options, depending<br />
on the individual project circumstances.<br />
Guide NR Selection Approach<br />
The most common way to select and schedule FCUs is to use<br />
the guide NRs based on assumed acoustic performances in<br />
association with cooling and heating performance requirements.<br />
Although this is not as accurate as a detailed desktop acoustic<br />
assessment, it allows the consultant or design contractor to<br />
specify and schedule the FCUs that are likely to be required on<br />
the project.<br />
These schedules will enable pricing to be completed, however if<br />
room noise levels need to be guaranteed, it is essential that a<br />
detailed acoustic assessment is undertaken at a later stage.<br />
Detailed Desktop Acoustic Assessment<br />
The only way of ensuring that FCUs are correctly selected<br />
acoustically for any project installation (be it general offices,<br />
meeting areas, hotel rooms, apartments etc) is to undertake a<br />
detailed desktop acoustic assessment. CAICE can provide this<br />
service via one of two methods:<br />
Option 1: The Acoustic Consultancy Approach<br />
Lee Cunningham Partnership operates as an independent<br />
acoustic consultancy. Detailed design information for the project<br />
can be taken and modelled using noise prediction software,<br />
resulting in limiting sound power level data for each particular<br />
installation.<br />
Once limited discharge and inlet/radiated sound power levels<br />
have been derived, this information should be used within<br />
proiect specifications to ensure that FCU manufacturers offer<br />
acoustically compliant products.<br />
Where early stage designs are undertaken, any assumed<br />
acoustic performances of critical components such as the false<br />
ceiling, diffuser plenums, length of flexible ducts, etc would also<br />
be specified.<br />
For advice and pricing please call 0844 847 5360 or visit the<br />
website at www.lcpacoustics.co.uk for further information.<br />
Option 2: The CAICE Design Approach<br />
CAICE, in association with Lee Cunningham Partnership, have<br />
an on-going research programme into the acoustics of FCUs<br />
and other ceiling void mounted mechanical equipment. This has<br />
resulted in CAICE having new acoustic modelling software,<br />
enabling room noise levels to be predicted more accurately than<br />
ever before.<br />
This design service is normally available post-order, however an<br />
initial pre-tender design review can be undertaken for projects<br />
where CAICE can be specified on an equal and approved basis.<br />
The following information would be required to accurately<br />
complete a detailed desktop acoustic assessment:<br />
<br />
<br />
<br />
<br />
<br />
<br />
Noise criteria<br />
Mechanical services layout drawings<br />
Dimensional data for room spaces and ceiling void depth<br />
False ceiling construction and corresponding certified<br />
sound reduction data<br />
Details of chosen grilles, diffusers and plenums<br />
Room finishes<br />
Certified Testing<br />
Depending on the confidence in the chosen FCU supplier,<br />
Certified Testing can be undertaken to prove compliance with<br />
the results of any detailed desktop acoustic assessment.<br />
Certified testing on a sample <strong>unit</strong> can therefore be done in two<br />
ways:<br />
Option 1: Witnessing a sound power level test<br />
For the designer to have absolute confidence in the FCU data,<br />
we would recommend a witness test of sound power level<br />
measurements at an independent test laboratory. This will<br />
confirm the noise data claimed by the manufacturer against any<br />
limiting sound power level specification. CAICE data is tested to<br />
BS4856, thereby removing any potential uncertainty over the<br />
accuracy of the claimed data.<br />
Option 2: On-site mock-up test<br />
This is the most reliable method for guaranteeing that room<br />
noise design criteria will be met. The aim is to install the FCU in<br />
a typical set-up, i.e. with all the other components to be used on<br />
the project and system fully commissioned. The <strong>unit</strong> can then<br />
be acoustically tested, enabling the acoustic calculation model to<br />
be verified.<br />
Mock-up tests in other locations are often suggested but in our<br />
experience they rarely replicate the final on-site conditions, as it<br />
is probable that one or more of the components such as the<br />
room size, ceiling systems, the grilles etc will differ. Therefore<br />
although they can give a good indication, it is always best to<br />
organise an on-site mock up test where possible.<br />
14<br />
www.caice.co.uk
Commissioning<br />
Pre-Commissioning<br />
The following points should be considered prior to any FCU<br />
acoustic commissioning work:<br />
<br />
<br />
<br />
<br />
<br />
<br />
Ensure a commissioning method statement is available.<br />
Check central plant air supply system is properly<br />
commissioned and balanced.<br />
Ensure that ductwork joints are properly sealed.<br />
The false ceiling installation is complete.<br />
Ensure FCU’s are running at their correct design duties<br />
and record the speed control set point for AC <strong>unit</strong>s or the<br />
control voltage (0-10v dc) for EC <strong>unit</strong>s.<br />
Filters are in place and clean.<br />
FCU Commissioning<br />
It is important to highlight that successfully commissioning a<br />
FCU for airflow is not the same process as commissioning for<br />
acoustics. Whereas CIBSE Guides permit air volume tolerances<br />
of up to 10% over the design figure, this is not compatible with<br />
acoustic design, where air volumes should not be above 2% of<br />
design.<br />
This is an important point to note, as this can affect the<br />
commissioning procedure and associated costs incurred by the<br />
specialist commissioning contractors.<br />
Airflow Rate Commissioning guidelines<br />
<br />
<br />
<br />
1. Background check (all FCU’s and other plant<br />
equipment switched off)<br />
2. AHU central plant on only<br />
3. FCU equipment on only<br />
4. AHU and FCU equipment on together<br />
The consultant should then compare the spectral data to<br />
the project design parameters.<br />
If the noise level is too high then check the following<br />
items as they can all have a significant impact on the<br />
resultant noise level in the room:<br />
1. Whether carpets and furnishings are part of the<br />
specification and are they fitted<br />
2. Is the room size the same as the manufacturer<br />
designed against<br />
3. Is the ceiling providing the attenuation quoted<br />
Should the NR levels not be achieved, then additional<br />
diagnostic testing will be required.<br />
Lee Cunningham Partnership is the acoustic consultancy<br />
division of CAICE and its staff are well qualified in acoustic<br />
commissioning of <strong>fan</strong> <strong>coil</strong> <strong>unit</strong>s and fault diagnosis. They will be<br />
happy to discuss any FCU noise design principles or acoustic<br />
commissioning issues.<br />
<br />
<br />
<br />
<br />
Switch on FCU and run for at least 20mins.<br />
Air flow rate measurements should be made at each<br />
discharge diffuser/grille using a suitable calibrated<br />
instrument such as a balometer.<br />
Obtain the flow rate tolerances from the designer.<br />
If the air flow rates are outside the tolerance specified,<br />
then the duct static resistances should be checked at<br />
suitable locations using a Pitot tube.<br />
Lee Cunningham Partnership<br />
Acoustic Consultancy<br />
Building Services Acoustics including Fan Coil<br />
Unit Desktop Assessments and Commissioning<br />
Surveys and Testing<br />
Acoustic Commissioning guidelines<br />
This should be carried out by a suitably qualified acoustic<br />
consultant in approximately the following manner:<br />
Architectural Acoustics<br />
0118 918 6460 or visit www.lcpacoustics.co.uk<br />
<br />
The consultant should use a Type 1 calibrated sound<br />
level meter and measure noise for at least 10s in<br />
representative areas of the room (not directly under a<br />
grille) under the following conditions:<br />
Further Information<br />
Please see CIBSE publication TM43: Fan Coil Units.<br />
www.caice.co.uk<br />
15
Specification<br />
Chassis<br />
All <strong>unit</strong>s are manufactured from galvanised sheet steel,<br />
incorporating core <strong>unit</strong> and multi-spigotted or rectangular<br />
discharge plenums as applicable. All edges are de-burred and<br />
formed inwards to prevent exposure of bare metal. Coils are<br />
mounted within condensate trays, extended under the control<br />
valves and connections, with fall to drain to overcome a<br />
maximum of 50 Pa inlet pressure. Available with top or bottom<br />
access.<br />
Fans and Motors<br />
Fans are double inlet, double width, direct drive centrifugal type<br />
with high efficiency, low noise forward curved galvanized steel<br />
impellers. Fan scrolls are galvanized steel and all <strong>fan</strong><br />
assemblies are dynamically balanced in two planes according to<br />
DIN ISO 1940.<br />
AC motor variants have external rotor motors with Class 1<br />
protection, Class B insulation and an IP44 rating. EC<br />
(electronically commutated) motor variants have external rotor<br />
motors and an IP42 rating. All motors operate from a<br />
230v/1ph/50Hz supply, and have sealed for life, maintenance<br />
free ball bearings with a life expectancy of 40,000 hours in<br />
normal operation.<br />
Heat Exchangers<br />
Coils are manufactured from solid drawn copper tubes,<br />
mechanically expanded onto aluminium fins with headers<br />
suitable for 2 or 4 pipe systems, and tested up to 15 bar. All <strong>coil</strong>s<br />
are fitted with manual air vents. Coils are mounted within<br />
condensate trays, extended under the control valves and<br />
connections, with fall to drain.<br />
Condensate Drain Trays<br />
Drain trays are constructed from galvanized steel, with welded<br />
corners painted with corrosion resistant zinc rich paint. The drain<br />
trays are partially exposed to facilitate easy cleaning or<br />
replacement on site if required. Optional polyester powder coat<br />
finish can be provided if requested.<br />
Filters<br />
Standard filters are of the wire framed washable type with a<br />
performance classification of up to G2 in accordance with<br />
BSEN779. Enhanced filter performance of up to G3 can be<br />
provided on request.<br />
Insulation<br />
Units are insulated throughout with up to 25mm open cell, Class<br />
O acoustic and thermal insulation.<br />
Controls<br />
All <strong>unit</strong>s are fitted with a speed control box with illuminated ON/<br />
OFF switch. The <strong>unit</strong> Control Box is ventilated and connected to<br />
the side of <strong>unit</strong> via two locating screws. Wiring to the <strong>fan</strong> motors<br />
is via either an IEC 320 kettle-plug type connection on AC<br />
versions, or multiplug connections on EC versions, making all<br />
control boxes easily replaceable if necessary.<br />
A hinged Control Box lid is provided and pre-punched to accept<br />
the mounting of most proprietary <strong>unit</strong> intelligent controllers. A 2<br />
metre mains lead is supplied as standard with an IEC 320 kettleplug<br />
type fitting for connection to the <strong>unit</strong>, terminating with three<br />
tinned wire leads for connection to an adjacent fused spur.<br />
Fan speed of AC motors is controlled via a multi-tapped<br />
transformer directly wired to a 9 speed switch system located on<br />
the <strong>unit</strong> Control Box. The transformer provides a nominal 24 volt<br />
AC output for powering of associated control devices.<br />
Fan speed of EC motors is controlled via a 0-10v dc signal,<br />
which can be varied via a screw head adjuster accessible from<br />
the outside of the control box. The control box may also be<br />
configured to allow remote <strong>fan</strong> speed adjustment via an external<br />
device (e.g. BMS system). A transformer provides a nominal 24<br />
volt AC output for powering of associated control devices.<br />
Attenuators<br />
Attenuator sections are fitted with internal linings manufactured<br />
from galvanised expanded steel mesh, and packed with<br />
controlled density acoustic media (mineral wool), with fibreglass<br />
tissue is bonded to the rear of the facing.<br />
Plenums<br />
Multi-spigotted plenums utilise galvanized steel circular spigots<br />
attached using screw fixings. Where blanking plates are fitted in<br />
place of circular splgots, these will have insulation to the rear.<br />
Rectangular discharge plenums incorporate a duct connection<br />
facility, and utilise acoustic elements to the same specification<br />
as attenuators.<br />
Condensate Pumps<br />
Where fitted, condensate pump will be Little Giant EC-400.<br />
Peristaltic pumps are available on request.<br />
Electric Heaters<br />
Where provided, electrical heaters will be via a finned heating<br />
element with termination in a metal control box, with 2-stage<br />
(low and high temperature) cut-outs. Other controls or interlock<br />
devices may be required to comply with I.E.E. or other local<br />
regulations.<br />
16<br />
www.caice.co.uk
Building Regulation Compliance<br />
A new version of Building Regulations Document L covering<br />
Conservation of Fuel and Power became effective from April<br />
2010. Fan <strong>coil</strong> <strong>unit</strong> projects submitted for planning after this date<br />
must ensure that the <strong>unit</strong>s do not exceed a Specific Fan Power<br />
Rating of 0.60 W/l/s.<br />
HBWS 300 series EC <strong>fan</strong> <strong>coil</strong> <strong>unit</strong>s comply with this rating at all<br />
duties, and generally fall below 0.40 W/l/s.<br />
EMC Compliance<br />
The 200 and 300 series <strong>fan</strong> <strong>coil</strong> <strong>unit</strong>s both meet the<br />
requirements of the EMC emission and imm<strong>unit</strong>y regulations.<br />
Harmonic filters are fitted to size 303 <strong>unit</strong>s and above to ensure<br />
compliance.<br />
AC to EC Comparison<br />
The 200 and 300 series <strong>fan</strong> <strong>coil</strong> <strong>unit</strong>s are identical in almost<br />
every aspect, except they utilise different types of <strong>fan</strong> and speed<br />
control.<br />
The 200 series incorporate AC <strong>fan</strong>s with a 9 step transformer<br />
speed controller, which is manually switched on site to set the<br />
<strong>unit</strong> to the correct duty. Historically <strong>fan</strong> <strong>coil</strong> <strong>unit</strong>s have been<br />
operated at a fixed duty but if the client does want to change<br />
speed remotely then relays can be fitted accordingly.<br />
The 300 series incorporate EC (electronically commutated) <strong>fan</strong>s,<br />
which have a built in AC to DC power converter. This means that<br />
whilst the <strong>fan</strong> <strong>coil</strong> <strong>unit</strong> is still connected on site to a 230V AC<br />
supply, the motor itself runs on DC power.<br />
Although EC <strong>fan</strong>s are currently more expensive than AC <strong>fan</strong>s<br />
they are between 50 to 70% more energy efficient when<br />
providing the same duty. Therefore not only do they easily<br />
comply with Document L, but running costs and payback periods<br />
are reduced significantly.<br />
The cooling performance for AC <strong>fan</strong> <strong>coil</strong> <strong>unit</strong>s is reduced due to<br />
the heat generated by the <strong>fan</strong> motor. However EC <strong>fan</strong>s<br />
generate negligible heat as they waste less energy. A typical<br />
saving of 60W per EC <strong>fan</strong> should therefore enable the designer<br />
to save costs by selecting smaller chillers, pumps, pipework etc.<br />
The reduction in heat also means that life expectancy for EC<br />
<strong>fan</strong>s is expected to be about double that for AC <strong>fan</strong>s, which<br />
improves whole life costing calculations.<br />
The 300 series <strong>fan</strong> <strong>coil</strong> <strong>unit</strong>s are provided with a rotary speed<br />
selector switch, which can be manually adjusted on site to set<br />
the <strong>unit</strong> to the correct duty, in a similar fashion to the AC <strong>unit</strong>s.<br />
However this switch can be easily bypassed so that the <strong>unit</strong> can<br />
be infinitely speed controlled using an external 0-10V signal.<br />
Many <strong>fan</strong> <strong>coil</strong> <strong>unit</strong> thermal controllers already have a spare 0-<br />
10V output, which therefore opens up the option to control <strong>fan</strong><br />
speed directly from the BMS.<br />
These features provide the client with even more energy saving<br />
and control opport<strong>unit</strong>ies:<br />
a. The <strong>unit</strong>s could be set back to a minimum duty when<br />
areas are unoccupied, or thermal loads are low.<br />
b. The <strong>unit</strong>s could be set to normal or boost duty as<br />
occupancy or thermal loads increase.<br />
c. The <strong>unit</strong>s could be switched on and off without<br />
introducing relays, as a zero volt signal de-energizes the<br />
<strong>fan</strong>. This could be undertaken by BMS, time clock, room<br />
mounted control or a hotel booking system.<br />
d. The <strong>fan</strong> speed signal could be used to identify when <strong>fan</strong>s<br />
have failed.<br />
e. Where pressure fluctuations occur the <strong>fan</strong> speed could<br />
be maintained to keep the volume constant, thereby self<br />
balancing the <strong>fan</strong> <strong>coil</strong>s in a building.<br />
Summary of EC Features and Benefits<br />
<br />
<br />
<br />
<br />
50 to 70% more energy efficient than AC <strong>unit</strong>s<br />
Considerably reduced energy bills for occupiers<br />
Easily comply with new Document L regulations<br />
Minimal heat pick up from motors helps to reduce<br />
building cooling loads, associated equipment costs and<br />
running costs<br />
Infinitely variable speed control available via BMS using 0<br />
-10V DC signal<br />
<br />
Further energy savings if BMS is used to set <strong>unit</strong>s to<br />
minimal duty during low occupancy or thermal load<br />
periods<br />
www.caice.co.uk<br />
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.<br />
Telephone<br />
0118 918 6470<br />
Facsimile<br />
0118 918 6480<br />
enquiries@caice.co.uk<br />
www.caice.co.uk<br />
CAICE Acoustic Air Movement<br />
Ltd.<br />
Riverside House<br />
3 Winnersh Fields<br />
Gazelle Close<br />
Winnersh<br />
Wokingham