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Old 07-06-2008, 07:38 PM   #16
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Inside Fan not working


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Originally Posted by BenH View Post
Ok i found the trfx, and if I measure with the output wires connected i get 9.75 at the spade, but if i unplug the wire (no load) i get 23.56vac. .
he's done this when no load with a load it drops to 10 volts. He has something pulling that down.

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Old 07-06-2008, 08:06 PM   #17
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tell us what your secondary VOLTS are off the furnace TR that supplies the whole show it has to be 24 or better (test right off the first wire nuts off it unit running and in the off position.if your reading 24V at the coil for the relay for the fan and it is not consistant in running the fan change the relay but lets see that main control voltage right out of the TR.

I'm sorry, but i'm really not sure what you mean. Are you saying test the other output pin of the transformer.

i did test the wires that are feeding the fan relay from the transformer (at the relay and the transformer) they both read 9.75 ( with all wires connected) then I unpluged thge feed to the relay and tested the transformer's output, i got 24v. i then plugged the relay back in and still read 24v. 30 seconds later I tested it again, with the relay plugged in and was back to 9.6
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Old 07-06-2008, 08:57 PM   #18
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Inside Fan not working


off the TR you should have a true 24Vs that feeds the systemwith the unit on or off...and at the fan relay with the stat calling for fan a true 24vs to pull the relay in that is reading the coil within the relay and not the contacts...make sure you are reading the coil....pull the stat off the subbase and jump R to G and check the coil down on the fan relay.
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Old 07-06-2008, 09:33 PM   #19
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off the TR you should have a true 24Vs that feeds the systemwith the unit on or off...and at the fan relay with the stat calling for fan a true 24vs to pull the relay in that is reading the coil within the relay and not the contacts...make sure you are reading the coil....pull the stat off the subbase and jump R to G and check the coil down on the fan relay.
Biggles I really and truely appreciate all your help, but I'm still having trouble understanding what your are telling me. Please forgive my ingorance, but I'm a 12v car guy with a meter and a mission. I've been wiring cars for 12 years, and when I hear relay, I think of 85/86/87/87a/30 (lol). I doubt HVAC uses that same code to name contact points.
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Old 07-07-2008, 07:44 PM   #20
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the reay has a coil numbered and N.O./N.C. contacts if you can tell what terminals are the coil and verify 24Vs at thos terminal with the wires all connected the relay is shot.
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Old 07-08-2008, 07:10 AM   #21
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Well, I think the relay did the trick, I put it in last night and all seems to be ok. I'll keep my fingers crossed. Thanks again to all that helped.

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