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This section contains an overview of the operation of
CGAX and CXAX air cooled chillers, equipped with
microprocessor based control systems.
Note: To ensure proper diagnosis and repair, contact a
qualified service organization if a problem should occur.
Sound power levels
General
Discharge
CGAX and CXAX chillers are scroll compressor, single or
Measurement conditions:
dual circuit air-cooled chillers. These units are equipped
Measurements taken in a room adjacent to the room containing the FWD, at the outlet of the rectangular duct (1.5 m
with unit-mounted starter/control panels and operate
long) fixed to its discharge opening.
with R410A refrigerant.
The basic components on the CGAX/CXAX are:
Fan
Unit
speed
• Unit-mounted panel containing starter and unit
1
controller
FWD 08
2
• Scroll compressors
3
1
• Brazed plate evaporator
FWD 10
2
3
• Air-cooled condenser with sub-cooler
1
• Electronic expansion valve
FWD 12
2
3
• Related interconnecting piping
1
FWD 14
2
Refrigerant Cycle
3
1
FWD 20
2
Refrigerant cycle is similar to other Trane Scroll
3
compressor chillers. Conquest chillers use brazed plate
evaporator and air-cooled condenser. Compressors
Intake
use suction gas cooled motors and an oil management
system to provide almost oil-free refrigerant to the
Measurement conditions:
condenser and evaporator for maximum heat transfer
Measurements taken at the horizontal air intake.
while lubricating and sealing compressor rotors and
bearings. The lubrication system helps to assure long
Fan
compressor life and contributes to quite operation.
Unit
speed
1
Liquid refrigerant coming from the condenser coils,
FWD 08
2
are metered into the brazed plate evaporator using an
3
1
electronic expansion valve to maximize chiller efficiency
FWD 10
2
at full and part load operation.
3
1
Chillers are equipped with a unit-mounted starter and
FWD 12
2
control panel. Microprocessor-based unit controller
3
provide accurate chilled water control an monitoring,
1
protection and limit functions. If problems occurs the
FWD 14
2
3
unit controller provide diagnostic messages to help the
1
operator in troubleshooting.
FWD 20
2
3
CG-SVX027D-GB
UNT-PRC002-GB
Power level in dB(A), per Hz frequency band
125
250
500
55
50
42
57
54
47
58
57
50
57
51
45
58
54
48
60
58
50
57
51
45
58
54
48
60
58
50
56
62
50
61
66
55
63
69
58
57
63
51
61
66
55
63
69
58
Power level in dB(A), per Hz frequency band
125
250
500
56
55
55
63
62
60
66
65
63
62
58
55
66
63
60
70
67
63
62
58
55
66
63
60
70
67
63
66
65
65
73
72
69
78
76
73
68
72
64
76
76
68
78
79
71
Operating Principles
1000
2000
4000
37
37
31
40
30
38
42
32
40
42
34
33
45
38
39
48
40
42
42
34
33
45
38
39
48
40
42
48
39
38
53
47
46
56
50
50
49
40
39
53
47
46
56
50
50
1000
2000
4000
53
46
45
60
53
53
62
56
55
58
51
48
62
56
55
65
59
59
58
51
48
62
56
55
65
59
59
65
57
50
71
64
59
75
69
64
64
56
52
71
65
61
74
69
66
Overall power
8000
dB(A)
30
46
40
50
43
53
28
48
35
51
39
54
28
48
35
51
39
54
36
56
45
60
49
63
37
57
45
60
49
63
Overall power
8000
dB(A)
42
57
53
64
57
67
44
61
52
66
57
69
44
61
52
66
57
69
46
68
57
74
63
78
50
69
61
75
66
78
11
35
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