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Figure 11 – Total and Partial Free-Cooling option
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
a.Total Free Cooling, Direct free cooling version
long) fixed to its discharge opening.
If there is a need to get a definition for partial heat recovery coil distribution, please contact the Trane Sales office.
Fan
Unit
Free-Cooling Enabling Conditions
speed
1
FWD 08
2
To get the free cooling active, condition is to have unit in
3
active cooling mode and that Outdoor temperature low
1
enough according to figure below.
FWD 10
2
3
The free cooling function is enabled when outdoor air
1
temperature is below Active chilled water cooling set
FWD 12
2
point minus FC_offset.
3
1
A hysteresis should also apply to avoid short cycling of
FWD 14
2
Free Cooling enabling logic. The Free Cooling offset is an
3
adjustable parameter to make free cooling active.
1
FWD 20
2
If free cooling function is enabled, free cooling becomes
3
the 1st stage of cooling. Free cooling is the first stage to
engage for cooling capacity loading and the last stage to
Intake
consider in capacity unloading.
Measurement conditions:
Measurements taken at the horizontal air intake.
Figure 12 – Free-cooling enabling conditions
Fan
Unit
speed
1
Free Cooling Active
FWD 08
2
3
1
FWD 10
Free Cooling Inactive
2
3
1
FWD 12
2
3
1
FWD 14
2
3
1
FWD 20
2
Free Cooling Activation Target
3
CTV-SVX009D-GB
UNT-PRC002-GB
Power level in dB(A), per Hz frequency band
125
250
55
50
57
54
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
1 deg. C
125
250
56
55
63
62
66
65
62
58
66
63
70
67
Free Cooling Target Offset
62
58
66
63
Chiller Entering Water Temperature
70
67
66
65
73
72
78
76
68
72
76
76
78
79
b.Partial Free Cooling, Direct free cooling version
In order to maximize tandem operation of free cooling
500
1000
2000
with compressor the following logic is applied:
42
37
37
47
40
30
When unit is configured in "Partial free cooling" , when
50
42
32
free cooling reaches its full capacity and there is a call
45
42
34
for compressor start, then the first circuit to start shall
48
45
38
50
48
40
be circuit 2 (if available).This also means compressor
45
42
34
balancing function is disabled in these conditions.
48
45
38
Note: UC800 will not lockout compressor below free
50
48
40
50
48
39
cooling change over point, but the compressor is locked
55
53
47
out when outdoor air is below "low ambient limit"
58
56
50
set at -10°C. So FC will be the only source of cooling
51
49
40
below -10°C.
55
53
47
58
56
50
500
1000
2000
55
53
46
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
Outdoor Air Temperature
73
75
69
64
64
56
68
71
65
71
74
69
Optional Free-Cooling
Overall power
4000
8000
dB(A)
31
30
38
40
40
43
33
28
39
35
42
39
33
28
39
35
42
39
38
36
46
45
50
49
39
37
46
45
50
49
Overall power
4000
8000
dB(A)
45
42
53
53
55
57
48
44
55
52
59
57
48
44
55
52
59
57
50
46
59
57
64
63
52
50
61
61
66
66
46
50
53
48
51
54
48
51
54
56
60
63
57
60
63
57
64
67
61
66
69
61
66
69
68
74
78
69
75
78
11
29
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