17
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
Frostat frame access
To access the Frostat frame (if present), it is necessary to remove the small side panel provided with a handle.
(see Figure 10).
• Remove the black gasket placed around the frostat frame.
• Remove the screws that fix the panel.
• Using the handle, remove the frostat panel.
• Access the frostat frame sliding it on the side of the unit.
Figure 10 –
Frostat frame access
1 = Panel gasket
2 = Screws
3 = Frostat panel with handle
4 = Plastic profile
5 = Internal frostat frame to slide out
Pipe connections to coil
A correct pipe work installation is essential for trouble-free coil operation. Figures 13 and 14 show an example for
piping water coils. (The diagrams do not limit the type of control system used.)
To prevent coil damage:
• All pipe work must be supported independently from the coils, locating a flexible joint directly on the coil
connection.
• All connections must be made in such a way that the expansion and contraction of pipes do not impose forces on
the coil headers.
• Over tightening of coil connections must be avoided to prevent any damage to headers and header connections.
Control the correct direction of liquid flow as indicated on the unit nameplate. To ease all maintenance operations,
it is recommended to fit all coil connections with a flange/pipe assembly and a shut-off valve. To ensure thermal
efficiency and air vent, the pipe must be connected to the coil, as indicated on respective labels.
CAUTION!
To avoid damaging the coil connections, it is essential to grip the union in a pipe wrench whilst applying
counter pressure to tighten the joint (see Figure 11).
Figure 11 –
Coil connection
Installation