Heat Pumps and Electric Heating - rth7400 and defrost
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jan0107
01-14-07, 07:40 PM
have replaced my trane weathertron t-stat with a rth7400. I followed the wiring correctly. Everything works good except, my unit will not go into defrost mode. em heat works, aux heat works when temp is set 2 degrees above room temp, a/c works. unit will defrost if I turn the a/c on, but I dont like turning the a/c on when it is 30 degrees out. I understand the t wire on the weathertron is what put it into defrost mode. What puts it into defrost mode now? The unit will keep the temp at what i set it to, but may run all day. Need a freon charge for that maybe?
Ed Imeduc
01-14-07, 10:16 PM
I understand the t wire on the weathertron is what put it into defrost mode.
My papers say that the T terminal from the old stat not used -tape off
The unit will keep the temp at what i set it to, but may run all day. Need a freon charge for that maybe? Yes Id say check the freon charge.
The defrost board outside should do the defrost for you
My papers say that the T terminal from the old stat not used -tape off
The unit will keep the temp at what i set it to, but may run all day. Need a freon charge for that maybe? Yes Id say check the freon charge.
The defrost board outside should do the defrost for you