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Free cooling economizer unit is supplied with
economizer and fresh air hood as a standard feature.
Fresh air percentage can vary from 0 to 100%.
An economizer consists of:
• A motorized damper with separate fresh air and return
Sound power levels
air sections.
• A fresh air hood with a grill delivered folded in the
Discharge
unit.
Measurement conditions:
• All necessary sensors for free cooling operation.
Measurements taken in a room adjacent to the room containing the FWD, at the outlet of the rectangular duct (1.5 m
The mechanical opening of the damper is managed by
long) fixed to its discharge opening.
the actuator which is adjusted by Trane controller.
Damper is activated in free cooling mode and may be
Fan
Unit
speed
further controlled by temperature control with return
1
and outdoor air sensors or by enthalpy control with
FWD 08
2
addition to temperature sensor of return and outdoor
3
1
humidity sensor.
FWD 10
2
3
Fresh air hood installation
1
FWD 12
2
Figure 13 - Fresh air hood assembly steps
3
Horizontal Flow
1
FWD 14
2
3
Step 1: Remove
Step 2: Position
1
sheet metal hood
the flange with
FWD 20
2
corner on the
3
outside
Intake
Measurement conditions:
Measurements taken at the horizontal air intake.
Fan
Unit
speed
1
FWD 08
2
Step 4: Repeat
Step 5: Repeat
3
the steps 2 and 3
the steps 2 and 3
1
FWD 10
2
3
1
FWD 12
2
3
1
FWD 14
2
3
1
Down Flow
FWD 20
2
3
Step 1: Remove
Step 2: Position
sheet metal hood
side flange
with corner on
the outside
RT-SVX060D-GB
UNT-PRC002-GB
Power level in dB(A), per Hz frequency band
125
250
500
55
50
42
57
54
47
58
57
50
57
51
45
58
54
48
60
58
50
57
51
45
58
54
48
60
58
50
56
62
50
61
66
55
63
69
58
Step 3: position
57
63
51
the cover hood
61
66
55
63
69
58
Power level in dB(A), per Hz frequency band
125
250
500
56
55
55
63
62
60
66
65
63
62
58
55
66
63
60
70
67
63
62
58
55
66
63
60
70
67
63
66
65
65
73
72
69
78
76
73
68
72
64
76
76
68
78
79
71
Step 3: position
the cover hood
Building Pressurization Control
Barometric Relief
The barometric relief allows to minimize overpressure
in the building caused by the introduction of fresh air.
This option is typically installed when fresh air intake is
below 25% of the nominal air flow and when the return
air pressure drop is below 25Pa.
Barometric damper is integrated as standard into
economizer option on downflow and not compatible
with heat recovery module unit only.
When the pressure of the building increase, the dampers
1000
2000
open and relieve air to the outside.
37
37
If the return air duct pressure drop is higher than the
40
30
42
32
building overpressure, the dampers will not open.
42
34
If the return air duct pressure drop is lower than the
45
38
48
40
building overpressure, the dampers will open and
42
34
relieve air outside of the building.
45
38
Figure 14 - Barometric relief
48
40
48
39
53
47
56
50
49
40
53
47
56
50
1000
2000
53
46
60
53
62
56
58
51
62
56
65
59
58
51
62
56
65
59
65
57
71
64
75
69
64
56
71
65
74
69
Options
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
37
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