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.
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