Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater
My old wiring was as follows: G, C, R, Y, O, W2 (with jumper to E) My new thermostat is a Honeywell RTH7600 and I have no clue how to wire this. I wired it the way that I though it would go, but the heat comes on when the a/c is supposed to be on and vice versa. I'm assuming that a couple of wires are backwards, but I dont know which ones.
Look at the instuction booklet (or on the T-stat board) for a switch for the reversing valve.
Some systems reversing valves are in cooling mode when energised, some are in cooling mode when NOT energised.
You are looking for the switch (Usually very tiny, or a different jumper setting) that will change the position of the reversing valve when calling for heat/AC.
This is not a switch like the typical "ON OFF AUTO, HEAT COOL EMG HT switches. It will be on the board itself or the back of the T-stat.
Posted on Dec 06, 2008
After you selected function 170 and set it to 7, your next function to set is 190( this is for your heat pump changeover valve) If you wired "O" to your O/B terminal, set 190 to 0, then press DONE. This should correct the problem.
Posted on May 05, 2009
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Posted on Jan 02, 2017
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