VAV-SVX01C-EN
11
VAV Start Up/Check Out Procedure
Zone Sensor Check-out
If an erroneous temperature is being reported to the UCM, use the
“Zone sensor temperature-
resistance table,” p. 11
to verify the integrity of the adjustable set point potentiometer or sensor. The
resistance should be measured across the terminals to which the device is connected.
Note:
Disconnect the zone sensor from the UCM when making the checks listed in the table below.
Blinking slowly approx. 1 blink/sec.
Communication is occurring on the link but not for that particular UCM.
Blinking quickly (multiple blinks/sec.)
Communication is occurring on the link, specifically with that UCM.
"Off”
Polarity is correct and no communication is occurring on the link
Table 2.
Yellow LED communication indicator function (continued)
LED State
Indication
Table 3.
Zone sensor temperature-resistance table
Temp (
°F)
Thermostat Thumbwheel Resistance (Ohms)
Sensor Resistance (k Ohms)
55
792
17.0
56
772
16.5
57
753
16.1
58
733
15.7
59
714
15.4
60
694
15.0
61
675
14.6
62
656
14.3
63
636
14.0
64
617
13.6
65
597
13.3
66
578
13.0
67
558
12.6
68
539
12.3
69
519
12.1
70
500
11.8
71
481
11.5
72
461
11.2
73
442
11.0
74
422
10.7
75
403
10.4
76
383
10.2
77
364
10.0
78
344
9.7
79
325
9.5
80
306
9.3
81
286
9.0
82
267
8.8
83
247
8.6
84
228
8.4
85
208
8.2
Note:
Thumbwheel resistance checks are made at TB3-2 and TB3-3 on the zone sensor. Temperature sensor resistance is
measured at TB3-1 and TB3-2 of the zone sensor.
Summary of Contents for VAV-UCM 4.2
Page 1: ...May 2010 VAV SVX01C EN Installation Operation Maintenance VAV UCM 4 2...
Page 81: ...VAV SVX01C EN 81 Troubleshooting Figure 46 Single duct with single phase voltage electric heat...
Page 82: ...82 VAV SVX01C EN Troubleshooting Figure 47 Single duct with three phase voltage electric heat...
