RLC-SVX023A
19
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
Installation - Mechanical
Cooling device bypass – Figure 3
Cooling device bypass is also a valid control method if
the chiller temperature requirements can be maintained.
Advantage:
• Excellent control by maintaining constant water flow
through the condenser.
Disadvantage:
• Higher cost because of the dedicated pump required for
each chiller if condenser pressure is the control signal.
Figure 3
1
2A
3
4
4
CDS
EVP
5A
6
7
CO
CI
EO
EI
Condenser water pump with variable frequency drive –
Figure 4
Advantages:
• Pumping cost can be reduced. Good cooling device
temperature control.
• Relatively low first cost.
Disadvantage:
• Increased rate of fouling due to lower water velocity in
the condenser.
Figure 4
8
4
CDS
EVP
5B
7
CO
CI
EO
EI
1 = Electric valve actuator
2A = 3-way valve or 2 butterfly valves
2B = 2 butterfly valves
3 = RTSF controller
4 = Refrigerant pressure line
5A = Condenser water pump
5B = Condenser water pump with VFD
6 = To/from cooling load
7 = To/from cooling device
8 = Electric controller
EI = Evaporator Inlet
EO = Evaporator Outlet
CI = Condenser Inlet
CO = Condenser Outlet
