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
55
Pre-Start Checkout
WARNING!
To prevent injury or death due to
electrocution, take extreme care when performing
service procedures with electrical power energized.
CAUTION!
Do not interchange any load leads that are
from the unit contactors or the motor terminals. Doing
so may damage the equipment.
Water System Flow Rates
Establish a balanced chilled/hot water flow through the
water exchangers. The flow rates should be between the
minimum and maximum values given on the pressure
drop curves.
Water System Pressure Drop
Measure the water-pressure drop through the water
exchangers on the field installed pressure taps on the
system water piping. Use the same gauge for each
measurement. Do not include valves, strainers, or
fittings in the pressure drop readings.
Integrated Pump Package (Optional)
Before starting up the pump, the pipe system must be
thoroughly cleaned, flushed and filled with clean water.
Do not start the pump until it has been vented. To ensure
correct venting, open the vent screw located on the
pump housing on the suction side (see next figure).
Figure 21 -Typical integrated chilled water pump
Figure 22 - Typical integrated hot water pump
CAUTION!
When using freeze inhibitor, never fill the
system with pure glycol; this will damage the shaft seal.
Always fill the system with diluted solution. Maximum
concentration of glycol is 40% for unit with pump
package.
CAUTION!
Failure to operate pump w/o water or insert
high glycol concentration will lead to premature seal
damage and void the warranty.
If the unit is installed in a humid environment or a
location with high air humidity, the bottom drain hole
on the pump motor should be opened. The enclosure
class of the motor is then changed from IP55 to IP44. The
function of the drain holes is to drain off water which has
entered the stator housing with air humidity.
