Original message
| dawgman315
 |  "Trane Defrost Circuit Board"
, posted Sat 4 Oct 16:10  
I ran into a problem this week that puzzles me. I was working on a trane weathertron heat pump that would not go into heat mode. All the conditions for operation were satisfied, but the compressor coil would not pull in. I checked the actuating voltage coming from the Defrost circuit board card and found it to be only 22.07, not guite enough to pull in the coil. All of the voltages going into the card are satisfactory, in the 25 to 26 range, but the all important voltage coming from the card is not enough pull in the contactor. Is their an adjustment on these boards to increase the output voltage? I noticed in the left corner of the board a white wire with three different stabs that looked like some kind of adjusting point, but when I moved the stab to each of the stabs, the output voltage didn't change. Have you seen this before. I could use some help.
thanks
Dawgboy
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Replies:
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| Jojo98
| "Re(1):Trane Defrost Circuit Board" , posted Sun 5 Oct 00:44
If the contactor coil is 24vac, then 22vac is more than enough to energize the coil. I would verify that all of the safeties are closed. Sounds like you are discribing the defrost initiating jumper; all that does is set the defrost cycle check time, and no they do not adjust secondary voltage, and no there is no secondary voltage adjustment on the equipment.
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