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Notice: Waterbox Damage!
Failure to follow these instructions could result in
damage to the waterbox. Do not use Teflon® pipe tape
or overtighten when installing valves, drains, plugs, and
vents on cast iron waterboxes.
Sound power levels
RTAF chillers are equipped with two drain connections,
Discharge
one located on each waterbox. Waterboxes also include
vent connections to assist in bleeding air from the
Measurement conditions:
chilled water loop. These vent connections should not
Measurements taken in a room adjacent to the room containing the FWD, at the outlet of the rectangular duct (1.5 m
be assumed to be capable of venting all chilled water
long) fixed to its discharge opening.
piping.
Fan
In order to completely remove water from the evaporator
Unit
speed
tubes and waterboxes, vent and drain connections on
1
both waterboxes should be opened. Use pressurized
FWD 08
2
3
air to ensure all water is removed from the evaporator.
1
In addition, two-pass supply waterboxes should have
FWD 10
2
drainage capability through supply water piping.
3
Incomplete drainage increases the risk of damage due
1
FWD 12
2
to expansion associated with trapped water freezing.
3
1
Note: If evaporator will be drained for winter storage, the
FWD 14
2
3
heaters must be disconnected to prevent overheating.
1
It is also mandatory to fulfill the drainage for winter
FWD 20
2
season for unit arriving from factory.
3
Sufficient glycol quantity and concentration must be
Intake
introduced in the lower part of the evaporator head to
prevent damage from stagnating water freezing.
Measurement conditions:
Measurements taken at the horizontal air intake.
Pressure Gauges
Fan
Install field-supplied pressure components as shown in
Unit
speed
Figure 6. Locate pressure gauges or taps in a straight
1
FWD 08
2
run of pipe; avoid placing them near elbow (at least at
3
10 pipe diameter from discontinuity).
1
To read manifold pressure gauges, open one valve and
FWD 10
2
3
close the other (depending on the side of the desired
1
reading), this eliminate errors resulting from differently
FWD 12
2
calibrated gauges installed at unmatched elevations.
3
1
FWD 14
Pressure Relief Valves
2
3
1
Install a water pressure relief valve in the evaporator
FWD 20
2
inlet piping between evaporator and the inlet shutoff
3
valve. Water vessels with close-coupled shutoff valves
have high potential for hydrostatic pressure buildup on
a water temperature increase. Refer to applicable local
codes for relief valve installation.
RLC-SVX19G-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
57
63
51
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
Evaporator Flow Switch
Specific connection and schematic wiring diagram
are shipped within the unit. Some piping and control
schemes, particularly those using a single water pump
for both chilled and hot water, must be analyzed to
determine how and/or if a flow sensing device will
provide the desired operation.
Flow Switch Installation – Typical Requirements
1.
Mount the switch upright, with a minimum of
10 pipes diameters of straight horizontal run on
each side. Do not install close to elbows, orifices,
1000
2000
or valves. The arrow on the switch must point in the
37
37
direction of the flow. For additional information,
40
30
consult the flow switch information sheet coming
42
32
42
34
with the part.
45
38
2.
To prevent switch fluttering, remove all air from the
48
40
water system. Tracer UC800 provides a 6 second
42
34
45
38
time delay after a "loss-of-flow" diagnostic before
48
40
shutting the unit down. Contact a Trane service
48
39
representative if nuisance machine shutdowns
53
47
persist.
56
50
49
40
3.
Adjust the switch to open when water flow falls
53
47
below nominal values. Evaporator data is given
56
50
on the General Information Section. Flow Switch
contacts are closed on proof of water flow.
4.
Install a pipe strainer in the entering evaporator-
water line to protect components.
CAUTION! Control voltage from the chiller to the flow
proving device is 110V AC.
1000
2000
53
46
Notice: Evaporator Damage!
60
53
If the microprocessor calls for a pump to start and
62
56
water does not flow, the evaporator may be damaged
58
51
62
56
catastrophically. It is the responsibility of the installing
65
59
contractor and/or the customer to ensure that a pump
58
51
will always be running when called upon by the chiller
62
56
controls.
65
59
65
57
71
64
75
69
64
56
71
65
74
69
Drainage
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
103
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