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Refrigerant Charge
If a low refrigerant charge is suspected, first determine
the cause of lost refrigerant. Once the problem is
repaired follow the procedures below for evacuating
Sound power levels
and charging the unit.
Refrigerant recovery
Discharge
1. Insure that the water flow is maintained on condenser
and evaporator during all the recovery operation.
Measurement conditions:
2. Connections on evaporator and condenser are
Measurements taken in a room adjacent to the room containing the FWD, at the outlet of the rectangular duct (1.5 m
available to remove the refrigerant. Weigh the
long) fixed to its discharge opening.
refrigerant removed.
Fan
CAUTION !
Unit
speed
Never recover refrigerant without maintaining nominal
1
FWD 08
water flow on heat exchangers during all the recovery
2
3
operation. Evaporator or condenser could freeze and
1
bringing severe damages to the unit.
FWD 10
2
3
3. Use a "refrigerant transfer machine" and adequate
1
service cylinders to stock the recovered refrigerant.
FWD 12
2
3
4. According to its quality, use recovered refrigerant to
1
charge the unit or give it to refrigerant producer for
FWD 14
2
recycling or elimination.
3
1
FWD 20
2
3
Intake
Measurement conditions:
Measurements taken at the horizontal air intake.
Fan
Unit
speed
1
FWD 08
2
3
1
FWD 10
2
3
1
FWD 12
2
3
1
FWD 14
2
3
1
FWD 20
2
3
UNT-PRC002-GB
RLC-SVX023A
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
Maintenance Procedures
Evacuation and Dehydration
1. Disconnect ALL power before/during evacuation.
2. Connect the vacuum pump to the ½'' service valves on
the oil separator and on the liquid line.
3. To remove all of the moisture from the system and to
insure a leak free unit, pull the system down below
500 microns.
4. After the unit is evacuated, perform a standing rise
test for at least an hour. The pressure should not rise
more than 150 microns. If the pressures rises more
than 150 microns, either a leak is present or moisture
still in the system.
NOTE: If oil is in the system, this test is more difficult.
1000
2000
37
37
The oil is aromatic and will give off vapors that will raise
40
30
the pressure of the system.
42
32
42
34
Refrigerant Charging
45
38
48
40
42
34
Once the system is deemed leak and moisture free,
45
38
use the ½'' service valves at the top of the oil separator
48
40
and on the liquid line, after the expansion valve.
48
39
53
47
Refer to Table 1 and unit nameplate for refrigerant
56
50
charge information.
49
40
53
47
56
50
1000
2000
53
46
60
53
62
56
58
51
62
56
65
59
58
51
62
56
65
59
65
57
71
64
75
69
64
56
71
65
74
69
Overall power
4000
8000
dB(A)
31
30
46
38
40
50
40
43
53
33
28
48
39
35
51
42
39
54
33
28
48
39
35
51
42
39
54
38
36
56
46
45
60
50
49
63
39
37
57
46
45
60
50
49
63
Overall power
4000
8000
dB(A)
45
42
57
53
53
64
55
57
67
48
44
61
55
52
66
59
57
69
48
44
61
55
52
66
59
57
69
50
46
68
59
57
74
64
63
78
52
50
69
61
61
75
66
66
78
11
45
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