11
UNT-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
CG-SVX051A-GB
49
This section contains an overview of the operation of
CMAF Multi-Pipe unit equipped with microcomputer-
based control systems.
It describes its overall operating principles.
Note:
To ensure proper diagnosis and repair, contact a
qualified service organization if a problem could occur.
General
The Model CMAF Multi-Pipe unit has scroll
compressor(s), dual circuit, air-cooled reversible coils.
These units are equipped with unit-mounted starter
control.
The basic components of a CMAF unit are:
•
Unit-mounted panel containing starter and Tracer
Symbio™ 800 controller and Input/Output LLIDS
•
Scroll compressors
•
Brazed plate Chilled / hot water exchanger
•
Air-cooled Fin & tube coils
•
Electronic Expansion Valve (EXV)
•
Four Way Valves
•
Actuated Isolating Valve
•
Electronic Mode Valves
•
Refrigerant Receiver
Refrigerant Cycle
The CMAF Multi-Pipe unit has 3 exchangers, a dedicated
brazed plate Chilled/Hot Water Exchanger for respectively
chilled and hot water and an air-cooled fin & tube coil
exchanger.
The unit can run for each circuit one of the 3 operating
modes, it can also run the heat recovery mode on a
circuit with a different mode on the opposite circuit to
better satisfy the cooling / heating demand.
The compressors use suction gas cooled motors and
an oil management system to provide almost oil-free
refrigerant to exchangers for maximum heat transfer
while lubricating and sealing compressor rotors and
bearings. The lubrication system helps to assure long
compressor life and contributes to quiet operation.
Depending of the operating mode, the refrigerant go
through the 4 way valve and isolation valves prior to
condense into coil modules or the hot water exchanger.
Liquid refrigerant is metered using an electronic
expansion valve into the brazed plate evaporator or
the coil exchanger to maximize unit efficiency at full
and part load operation or into hot water exchanger for
defrosting..
Isolation valves avoid refrigerant migration toward
inactive exchanger and orient the refrigerant toward the
active condenser.
The mode valves (Cooling, H/P, Defrost valves) permit
to orient the two-phase refrigerant toward the active
evaporator and avoid flooding inactive ones.
CMAF Multi-Pipe unit is equipped with a unit-mounted
starter and control panel. Microprocessor based unit
control modules provide accurate water control and
providing monitoring, protection and adaptive limit
functions.
The adaptive nature of the controls intelligently prevent
the unit from operating outside of its
limits, or compensates for unusual operating conditions
while keeping the unit running rather than simply
shutting it off. If problems do occur, the Tracer Symbio™
800 controls provide diagnostic messages to help the
operator in troubleshooting.
Oil System
The oil is efficiently separated inside the scroll
compressor and will remain in the scroll compressor
during all run cycles. Between 1-2% of the oil circulates
around with the refrigerant.
See Maintenance procedures section for oil level
information.
Arbitration Rules
Tracer Symbio™ 800 provides the capability of switching
circuit from a certain mode to another.
It arbitrates compressors to satisfy as much the cooling
and heating demands from actual unit status.
The CMAF Multi-Pipe unit is able to operate several main
settings of Capacity Control Priority that user can set:
1. Cooling Only:
Runs unit as an air-sourced Multi-pipe
unit without heat recovery.
2. Heating Only:
Runs unit as an air-sourced heat pump
without heat recovery.
3. Simultaneous Heating and Cooling:
a. Heat recovery Priority: Factory default mode.
If both demands are present, the heat recovery
strategy is driven by the lowest demand. The best
unit efficiency is achieved.
b. Max. capacity Priority: The heat recovery
strategy is driven by the highest capacity demand.
Suited for applications where heating and cooling
demands need to be satisfied more quickly. This
mode involves more frequent cycle changes.
c. Cooling Priority: When the unit runs in recovery
mode and both demands are present, the recovery
strategy is driven by cooling capacity demand.
d. Heating Priority: When the unit runs in recovery
mode and both demands are present, the recovery
strategy is driven by heating capacity demand.
Operating Principles
