Posted: 7/26/2017 6:37:41 PM EDT
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I got my upstairs A/C working for a few weeks, then the 3 amp fuse on the control side went open. Put a new one in lasted 12 hours till it blew. Checked the control wiring to make sure connections are tight. Then replaced the thermostat and the contactor coil at the A/C unit, ran about 12 hours and blew the fuse and the 120 Volt side of the transformer went open. The transformer was new had 4 of the burn out on the 120 Volt side. I have the transformer, wired directly into to the XFER and common on the control board as per the schematic.
Anyone have any idea where to look for the problem? I would like to get one more summer out of the unit. It's a Rheem Criterion gas heater with a Rheem A/C unit. I never really need heat upstairs just some way to run the A/C I watched some YouTube videos, and the ones on testing transformers say the a failure on the primary side is something going on on the 120 side. The wiring coming into the furnace is a solid 120 volts. |
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id look at where the wires penetrate the condenser and the house, and look where the go into the tstat. any spot that is obvious for rubbing. usually straight runs are fine, but when they bend, and go into a unit they can chafe or rubout from vibrations, or where the bend and go into the house it could actually wear through. look at the easy and obvious spots.
the transformer you tstat could be on the fritz your contactor coil could be on the fritz or the relay for the blower motor in the air handler but id look for rubouts first. |
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Quoted:
id look at where the wires penetrate the condenser and the house, and look where the go into the tstat. any spot that is obvious for rubbing. usually straight runs are fine, but when they bend, and go into a unit they can chafe or rubout from vibrations, or where the bend and go into the house it could actually wear through. look at the easy and obvious spots. the transformer you tstat could be on the fritz your contactor coil could be on the fritz or the relay for the blower motor in the air handler but id look for rubouts first. |