CG-SVX027D-GB
19
11UNT-PRC002-GB
Sound power levels
Discharge
Measurement conditions:
Measurements taken in a room adjacent to the room containing the FWD, at the outlet of the rectangular duct (1.5 m
long) fixed to its discharge opening.
Fan Power level in dB(A), per Hz frequency band Overall power
Unit speed 125 250 500 1000 2000 4000 8000 dB(A)
1 55 50 42 37 37 31 30 46
FWD 08 2 57 54 47 40 30 38 40 50
3 58 57 50 42 32 40 43 53
1 57 51 45 42 34 33 28 48
FWD 10 2 58 54 48 45 38 39 35 51
3 60 58 50 48 40 42 39 54
1 57 51 45 42 34 33 28 48
FWD 12 2 58 54 48 45 38 39 35 51
3 60 58 50 48 40 42 39 54
1 56 62 50 48 39 38 36 56
FWD 14 2 61 66 55 53 47 46 45 60
3 63 69 58 56 50 50 49 63
1 57 63 51 49 40 39 37 57
FWD 20 2 61 66 55 53 47 46 45 60
3 63 69 58 56 50 50 49 63
Intake
Measurement conditions:
Measurements taken at the horizontal air intake.
Fan Power level in dB(A), per Hz frequency band Overall power
Unit speed 125 250 500 1000 2000 4000 8000 dB(A)
1 56 55 55 53 46 45 42 57
FWD 08 2 63 62 60 60 53 53 53 64
3 66 65 63 62 56 55 57 67
1 62 58 55 58 51 48 44 61
FWD 10 2 66 63 60 62 56 55 52 66
3 70 67 63 65 59 59 57 69
1 62 58 55 58 51 48 44 61
FWD 12 2 66 63 60 62 56 55 52 66
3 70 67 63 65 59 59 57 69
1 66 65 65 65 57 50 46 68
FWD 14 2 73 72 69 71 64 59 57 74
3 78 76 73 75 69 64 63 78
1 68 72 64 64 56 52 50 69
FWD 20 2 76 76 68 71 65 61 61 75
3 78 79 71 74 69 66 66 78
Installation – Mechanical
Drainage
Locate the unit near a large capacity drain for water
vessel draindown during shutdown or repair. Water
piping is provided with drain connections. Refer to
“Water Piping.” All local and national codes apply.
Piping
A vent is provided on the top of the evaporator at the
return end. Be sure to provide additional vents at high
points in the piping to bleed air from the chilled water
system. Install necessary pressure gauges to monitor the
entering and leaving chilled water pressures.
Provide shutoff valves in lines to the gauges to isolate
them from the system when they are not in use. Use
rubber vibration eliminators to prevent vibration
transmission through the water lines. If desired, install
thermometers in the lines to monitor entering and
leaving water temperatures. Install a balancing valve
in the leaving water line to control water flow balance.
Install shutoff valves on both the entering and leaving
water lines so that the evaporator can be isolated for
service. Make sure the water circuit includes all devices
and controls used to provide proper water system
operation and unit operating safety.
Figure 3 - Unit typical water circuit
1 = Pressure gauges: show entering and leaving water
pressure
2 = Balancing valve: adjusts water flow.
3 = Air purge allows to remove the air from the water
circuit during fill up.
4 = Stop valves: isolate chillers and water circuiting
pump during maintenance operations.
5 = Thermometers: indicate chilled water entering and
leaving temperatures.
6 = Expansion compensators: avoid mechanical stress
between chiller and piping installation.
7 = Stop valve located on the outlet connection: used
to measure the water pressure inlet or outlet of
evaporator.
8 = Strainer: avoid to get heat exchangers dirty. All
installation must be equipped with efficient strainer
in order that only clean water enters into exchanger.
If there is no strainer, reserve will be formulated by
the Trane technician at the start-up of the unit. The
trainer used must be able to stop all particles with a
diameter greater than 1 mm.
9 = Draining: used as the draining the plate heat
exchanger.
10 = Do not start the unit with low water volume or not
enough pressurized circuit.
Note: A pressure switch device to detect lack of water
is not included in the pump package. Installation of this
type of device is highly recommended to avoid sealing
damage due to operation of pump without enough
water.
Minimal installation water content
The water volume is an important parameter because
it allows as table chilled water temperature and avoids
short cycle operation of the compressors.
Parameters which influence the water temperature
stability
• Water loop volume
• Load fluctuation
• Number of capacity steps
• Compressors rotation
• Dead band (adjusted on chiller controller)
• Minimum time between 2 starts of a compressor
Minimum water volume for a comfort application
For comfort application we can allow water temperature
fluctuation at part load. The parameter to take into
account is the minimum operating time of the
compressor. In order to avoid lubrication problem
on a scroll compressor it must run at least 2 minutes
120 seconds) before it stops.
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