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07-02-2012, 01:25 PM #1
Trane parallel vav box with ucm control board
Having issues with a couple of these boxes. Can't seem to get the vavs to respond properly to a change at the zone sensor or the tracer touchscreen. I have replaced the pressure transducer and cleaned the pickup rings. If I drive the damper from the tracer panel, the vav starts opening for a minute or so and then stops. I have checked the end switches on the damper assembly. I'm about to change the board as I can find nothing else that canned wrong. Any help would be appreciated.