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
35
Table 10 – Typical water content (m3) including buffer
Size
Content m3
080
2.4
090
2.6
100
2.9
110
3.3
130
3.6
140
4.0
150
4.3
165
4.6
180
5.1
190
5.4
3. Mode transitioning
For both chilled and hot water loop, when the unit is
transitioning a circuit from a mode to another, e.g.
heat recovery to heat pump / cooling or vice-versa the
minimum content against short cycle is largely sufficient
to smooth the supply temperature.
Expansion vessel
When the unit is delivered with pumps, a dedicated
expansion vessel shall be connected nearby its suction
to maintain a sufficient Net Positive Suction Head.
For the factory installed expansion vessel the initial
pressure should be adjusted about 0.2 bar lower than
the static pressure of the circuit at the pump inlet. The
expansion tank volume has been selected for typical
loop volume. It is recommended to check the expansion
tank volume with the installation information.
The following data is required:
C = Water capacity of the circuit
e = Expansion coefficient (difference between max and
min water temperature, in operation or not)
Pi = Initial pressure of the expansion tank
Pf = Final pressure: Max is given by the pressure relief
valve
Minimum Volume of expansion tank, Ve = (C x e)/(1-Pi/Pf)
Expansion coefficient of water various temperatures
°C
e
0
0.0001
10
0.0003
20
0.0018
30
0.0044
40
0.0073
50
0.0121
60
0.0177
70
0.0241
The minimum expansion volume for CMAF Multi-Pipe
units delivered with pump package is approximatively:
•
3% of the water content of chilled water loop
•
5% of the water content of hot water loop
Chilled water expansion tank volume (option):
50 l
Note:
Maximum pressure of the circuit is 400 kPa with
pump package and 1000 kPa without.
Chilled/hot water Piping
