CTV-SVX009D-GB
51
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
Periodic Maintenance
Isolation of the Refrigerant Charge
on the Low side of the System
By closing the suction-line service valve, refrigerant
charge can be isolated in the evaporator for maintenance
on the compressor.
Returning the unit to running conditions:
1. Open all the valves.
2. Manually Open EXV for 15 minutes to allow the
refrigerant drain to the evaporator by gravity.
Low side Charge-isolation Procedure
After normal shutdown, most of the charge resides in the
evaporator. Running cold water through the evaporator may
also drive much of the refrigerant to the evaporator.
1. Make sure the circuit is off.
2. Close the suction-line isolation valve.
3. Close the liquid line service valve.
4. Close the liquid line service valve
5. Manually open the EXV
6. Use a liquid pump or vacuum pump to move refrigerant
from the condenser to the evaporator. The liquid pump
will only be effective if there is a lot of charge in the
condenser. It may be connected to the condenser drain
port on the liquid-line isolation valve.
Note: If a pump is to be used, connect it before closing
this valve. This port is only isolated when the valve is back
seated. If a vacuum pump is used, then connect it to the
discharge-line service valve.
A vacuum pump will be required for part of the procedure.
The evaporator is large enough to hold all the charge, for any
unit, below the centerline of the shell. Therefore, no special
precautions are required to restart the unit after isolating the
charge in the evaporator.
Refrigerant Filter Replacement –
Changing Procedures
A dirty filter is indicated by a temperature gradient
across the filter, corresponding to a pressure drop. If the
temperature downstream of the filter is 4,4°C lower than
the upstream temperature, the filter should be replaced.
A temperature drop can also indicate that the unit is
undercharged.
GVAF has economizer and compressor cooling system,
besides to close EXV and liquid shutoff valve, any flow to
liquid cooling and economizer needs to be cutoff.
Lubrication System
No oil is needed in an oil free centrifugal compressor
and the use of oil is prohibited as it can damage internal
compressor parts.
Vacuum
Ensure gas removal by vacuum the 3 main areas of the unit
(suction side, discharge side and economizer side (between
TEXV and economizer shut off valve)).
