Trane CLCF Climate Changer Manual page 33

Belt tensioning
The tensioning of the drive belt is achieved by moving the motor slide support.
Figure 21 – Belt tensioning
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
Unit speed
1
FWD 08 2
3
1
FWD 10 Deflection d 2
Centre distance e 3
1
Power F
FWD 12 2
d = e * 0.016
3
Figure 22 – Pulley positioning
1
FWD 14 2
3
1
FWD 20 2
3
OK
Intake
Measurement conditions:
Measurements taken at the horizontal air intake.
Fan
Unit speed
1
1
FWD 08 2
3
1
1 = Correct position
FWD 10 2
2 = Pulleys out of line
3
3 = Pulleys not parallel
1
4 = Twisted pulleys
FWD 12 2
CAUTION! The belt drive should be re-tensioned following the first 10 hours of operation. The correct tensioning of
3
the belt is established independently from the belt cross section and the axial clearance (see Figure 22).
1
FWD 14 2
Alternatively a belt tensioning meter may be used (see Figure 23).
3
1
Figure 23 – Belt tension measurement
FWD 20 2
3
CAUTION! Damage to the motor and fan bearings can result from the belt being over tightened. A belt that is too
slack will result into early wear and poor efficiency (caused by slippage.)
AH-SVX03C-GB UNT-PRC002-GB
F
Power level in dB(A), per Hz frequency band
125 250
55 50
57 54
e
58 57
57 51
58 54
60 58
57 51
58 54
60 58
56 62
61 66
63 69
57 63
61 66
63 69
Power level in dB(A), per Hz frequency band
125 250
56 55
2 3
63 62
66 65
62 58
66 63
70 67
62 58
66 63
70 67
66 65
73 72
78 76
68 72
76 76
78 79
d
d = e x 0.016
500 1000 2000
42 37 37
47 40 30
50 42 32
45 42 34
48 45 38
50 48 40
45 42 34
48 45 38
50 48 40
50 48 39
55 53 47
58 56 50
51 49 40
55 53 47
58 56 50
500 1000 2000
55 53 46
4
60 60 53
63 62 56
55 58 51
60 62 56
63 65 59
55 58 51
60 62 56
63 65 59
65 65 57
69 71 64
73 75 69
64 64 56
68 71 65
71 74 69
Maintenance
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
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