Trane CONQUEST CGAX Series User Manual

CG-SVX027E-GB
49
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
Maintenance
Refrigerant Piping
The compressor suction and discharge connections
and piping are copper clad steel for easy brazing. In
most instances, piping may be reused. If piping is not
reusable, order the correct service parts. Cut all tubing
with a tubing cutter to prevent copper lings from
entering the system. Cut the tubing in a straight length
of pipe after the compressor connection has been
unsweated. The line can then be reinstalled using a slip
coupling and brazing.
Note: The compressor suction line configuration must
not be changed in any way. Changing compressor
suction line configuration will compromise proper oil
return to the compressor(s).
Compressor Electrical Terminal Box
Be sure to protect the terminal box when unbrazing or
brazing compressor refrigerant piping connections
Compressor Crankcase Heaters
Compressor crankcase heaters must be energized at
least eight hours before starting the chiller. This is
required to boil refrigerant out of the oil before startup.
Ambient temperature is not a factor and the crankcase
heaters must always be energized prior to startup.
Condenser Maintenance
Condenser Coil Cleaning
Clean the condenser coils at least once a year or more
frequently if the unit is in a “dirty” environment. A clean
condenser coil will help to maintain chiller operating
efciency. Follow the detergent manufacturer’s
instructions to avoid damaging the condenser coils.
Black epoxy coil protection (option on heat pump units)
It is recommended to clean the coils at unit start-up and
regularly to obtain optimum protection and life span of
the condenser coils. To clean the condenser coils use a
soft brush and a sprayer such as a garden pump type or
a high pressure type. A high quality detergent such as
Trane Coil Cleaner is recommended.
Note: If detergent mixture is strongly alkaline (pH value
greater than 8 .5), an inhibitor must be added.
Evaporator Maintenance
The Trane Model CGAX liquid chiller uses a brazed plate
heat paddle (BPHE) evaporator with factory installed
ow switch that is positioned in the evaporator water
pipe. The evaporator inlet also includes a water strainer
that must be kept in place to keep debris out of the
evaporator.
Note: Strainer maintenance is critical to proper
operation and reliability. Any particles larger than
1.6 mm entering the BPHE evaporator may cause the
evaporator to fail, requiring replacement.
Acceptable BPHE evaporator water ow rate is 1.4 to
4.2 l/ min per nominal unit kW capacity. To maintain
12-7°C in/out chilled water temperatures, the nominal
water ow rate is 2.8 l/min per cooling kW. Minimum
water ow rate must be maintained to avoid laminar
ow, potential evaporator freezing, scaling and poor
temperature control. Maximum water ow is 6 m/s. Flow
rates greater than this will cause excessive erosion. The
BPHE evaporator is difcult to clean should it become
plugged with debris. Indications of a plugged BPHE
evaporator include “wet” suction due to lack of heat
exchange, loss of superheat control, discharge superheat
less than 35°C, compressor oil dilution and/or starvation
and premature compressor failure.
Evaporator replacement
If the CGAX evaporator requires replacement, it is very
important that the new evaporator be replaced correctly
and with the correct refrigerant and water piping
connections. The refrigerant inlet/ liquid connection is at
the bottom of the evaporator and the refrigerant outlet/
suction connection is at the top of the evaporator and
both are on the same side. Pay particular attention to
evaporators with dual circuits. Avoid cross-circuiting
when installing the new evaporator.

Trane CONQUEST CGAX Series Specifications

General

Brand	Trane
Model	CONQUEST CGAX Series
Category	Heat Pump
Language	English