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The relay output from (1A11) is required to operate the
evaporator water-pump (CHWP) contactor. Contacts
should be compatible with a 115/230V (ac) control circuit.
The CHWP relay operates in different modes depending
on Tracer UC800 or Tracer BMS commands, if available, or
Sound power levels
service pumpdown (see maintenance section). Normally,
the CHWP relay follows the AUTO mode of the chiller.
Discharge
Whenever the chiller has no diagnostics and is in the
AUTO mode, regardless of where the auto command is
Measurement conditions:
coming from, the normally-open relay is energized. When
Measurements taken in a room adjacent to the room containing the FWD, at the outlet of the rectangular duct (1.5 m
the chiller exits the AUTO mode, the relay is timed open
long) fixed to its discharge opening.
for an adjustable (using TU) 0 to 30 minutes. The non-
AUTO modes in which the pump is stopped include Reset
Fan
(88), Stop (00), External Stop (100), Remote Display Stop
Unit
speed
(600), Stopped by Tracer (300), Low-Ambient Run Inhibit
1
(200), and Ice Building complete (101).
FWD 08
2
3
1
Table 39 – Pump Relay Operations
FWD 10
2
3
Chiller mode
1
FWD 12
Auto
2
3
Ice building
1
FWD 14
2
Tracer Override
3
Stop
1
FWD 20
2
Ice Complete
3
Diagnostics
Intake
• Exceptions noted in paragraphs following
Measurement conditions:
Measurements taken at the horizontal air intake.
When going from STOP to AUTO the CHWP relay is
energized immediately. If evaporator water flow is not
Fan
Unit
speed
established in 4 minutes and 15 seconds, the Tracer
1
UC800 de-energizes the CHWP relay and generates a
FWD 08
2
non-latching diagnostic. If flow returns (i.e. other system
3
controlling the pump), the diagnostic is cleared, the
1
FWD 10
2
CHWP is re-energized, and normal control is resumed.
3
If evaporator water flow is lost after it has been
1
FWD 12
2
established, the CHWP relay remains energized, the
3
CHWP relay remains energized and a non-latching
1
diagnostic is generated. If flow returns, the diagnostic is
FWD 14
2
cleared and the chiller returns to normal operation.
3
1
FWD 20
2
3
RLC-SVX19E-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
Relay Operation
57
51
45
Instant close
58
54
48
60
58
50
Instant close
56
62
50
61
66
55
Timed Open
63
69
58
Timed Open
57
63
51
61
66
55
Instant Open
63
69
58
Instant Open*
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
Installer-Supplied Components
In general, when there is either a non-latching or latching
diagnostic, the CHWP relay is turned off as though
there was a zero-time delay. Exceptions where the relay
continues to be energized occur with:
1. A low Chilled-Water Temperature diagnostic (non-
latching) (unless also accompanied by an Evaporator
Leaving-Water Temperature Sensor Diagnostic)
2. A starter-contactor interrupt-failure diagnostic, in
which a compressor continues to draw current even
after commanded to shut down.
3. A Loss of Evaporator Water Flow diagnostic (non-
1000
2000
latching) and the unit in the AUTO mode, after initially
37
37
40
30
having proven evaporator water flow.
42
32
42
34
45
38
48
40
Alarm and Status Relay Outputs
42
34
45
38
(Programmable Relays)
48
40
48
39
See RTAF User Guide for alarm and status relay outputs.
53
47
56
50
49
40
EDLS and ECWS Analog Input Signal
53
47
56
50
Wiring Details
See RTAF User Guide for EDLS and ECWS.
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
OR
OR
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
107
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