25
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
AH-SVX03C-GB
Start-up
Following the completion of all check list items, start up the unit for a test run.
CAUTION!
To conduct a run test that involves the measurement of motor and fan performances, the unit must be
connected to the complete installation.
CAUTION!
All access doors must be closed to avoid overflow in the installation that could result in motor damage
and to avoid safety risks to people.
CAUTION!
Before starting the fan, open all dampers. The fan must not be started if the dampers are closed.
After switching on power, check that the direction of the fan rotation is correct. In addition, the running power
consumption should be checked on all phases and compared with the power data indicated on the motor nameplate.
If the running power is too high, there is probably a faulty connection and the unit must be switched off immediately.
Check the fan and motor bearings for undue noise.
Measure the air volume and external pressure.
The following two situations may arise:
1. The air volume is too low as the real external static pressure is higher than the specified one.
Recommended action: increase the air volume by changing or adjusting the belt drive pulleys.
Please contact your local Trane sales office to get a proper belt drive selection.
CAUTION!
Do not increase the fan speed beyond the motor power rating allowed limit.
CAUTION!
Increasing the fan speed should be done only after a careful study of the operating point on the
appropriate fan curve.
Contact your local Trane sales office for a proper selection.
2. The air volume is too high. The reason is that the real external static pressure is lower than the specified one.
Result: Higher air volume involves a high motor absorbed power increase.
CAUTION!
Motor overload may result in motor damage.
Recommended action: change the belt drive pulleys or reduce the fan rpm according to the fan curve or reduce the
air volume by the use of dampers.
Ask a proper transmission selection from your local sales office.
In extreme cases, changing the motor, fan, and drive may be necessary.
The adjustment of variable belt drive pulleys must be carried out only when the unit is electrically disconnected,
ensuring that the system is not restarted unexpectedly.
Remove the pulley safety screws and turn through half of the pulley circumference. Then retighten the screws and
readjust the pulley belt tension (see Figure 21.)
Following any change in the pulley ratio, the motor power consumption must be rechecked. The nominal output
rating quoted on the name plate must not be exceeded.
If airflow does not conform to the specifications, please contact your local Trane sales office.
Note: The unit structure is designed so that it will not suffer permanent deformation up to a positive pressure
or negative pressure of 2000 Pa. To respect these limits, fan operation should be controlled depending on all
interception devices installed in the plant and/or in the air handling unit.
Evaporative Humidifiers/air washers
Water tanks must be thoroughly cleaned. Any building grit in the system may result in subsequent pump failure. Any
warranty claims in this context will not be accepted. Check that the pump suction filter basket, spray pipes, washer
nozzles are correctly seated. Check the washer sieve and clean as necessary.
Fill the tank and siphon with clean water and adjust the float valve so that closure occurs 2-3 cm below the overflow
level. In any case the suction pipe must be effectively vented. Then check that the pump rotation direction is correct.
Measure the absorbed power and check that it matches the data indicated on the pump name plate.
CAUTION! :
The pump must not be dry run to avoid any risk of overheating.
No warranty claims will be acknowledged if pump or pump motor damage is caused by a dry run.
Commissioning procedure
