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Posted by on November 25, 2006, 8:02 pm
Before I removed the old thermostat I wrote down and identified what
each wire letter and function based on a wiring diagram of my
thermostat (1F58-910) found here,
http://customer.honeywell.com/NR/rdonlyres/5E44C66F-DC38-4334-B256-C691C2EC1669/581/706627.pdf.
After taking notes on the thermostat wiring I matched the function of
each wire to the proper terminal of the new thermostat. Since both
thermostats were manufactured by White-Rodgers many of the terminal
letters matched up for the most part.
If something didn't match I called White Rodgers, which is where I was
told to connect the W wire (aka - 1st stage heat) to the B terminal
(aka c/o valve heat). I was then told to connect the E wire (aka -
emergency heat) to the W/E terminal (aka Emergency Mode 1st Stage). And
then finally I was told to jumper the W/E and W2 terminals. My W2 wire
(aka Aux. Heat) is plugged into the W2 terminal (aka - 2nd Stage Heat).
The problem is that after the heat pump cuts off I "believe" that the
fan and the emergency heat remain on. I assume this cause I can here
the house fan/blower still going and the temp will continue to rise as
much as 10 degrees. I can also confirm that when the thermostat reaches
target temp the heatpump stops humming and the fan of the heat pump
stops moving. Hence, the heatpump turns off when target temp is
reached.
I used the thermostat all summer and the air-conditioning worked fine I
also can turn the fan on and off fine when not in heat mode.
Jake wrote:
> > His problem is that its a heat pump and he shouldnt be messing with
> > that many wires. Most homeowners cant figure out more than about 4
> > wires. Especially when different manufactures use different terminal
> > designations for the same terminal. X, C, B and a host of others are
> > all the same terminal. He will understand though after he lets the
> > smoke out.
> > Bubba
>
> OK Bubba... now you've got me puzzled. I know one of our older
> buildings... 1987 I think... has a Trane very similar to this. Two stage
> electric backup pack.
>
> Aren't W2 and E two different things in that scenario... and doesn't
> this unit (like a lot of them) call for the fan when backup is active?
>
> We had a Carrier Commercial stat do this same exact thing on a unit...
> the contractor screwed with it forever and then one afternoon I got my
> meter out and started diagnosing things.
>
> First thing wrong was that the Day of Week was programmed wrong... thus
> the setpoints would run the program incorrectly. Next was that the stat
> called for fan all the time for some reason I can't remember now...
> except that it had to do with 2nd stage heat vs. E. As I remember,
> removing a jumper took care of it.
>
> Jake
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