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eosei · Jun 29, 2009, 08:05 PM

I am replacing white-rodgers 1E56W-309 thermostat to Honeywell VisionPRO 8000 programmable thermostat. I have 1H/1C system in my house. However, my furnace is used both for heating and cooling. I have read the installation manual for the white-rodgers thermostat and looked at the current thermostat installation. It is a 5-wire 1H/1C heating/cooling system. Now, a 5-wire heating/cooling system for a White-Rodgers 1E56W-309 means there is a transformer for heating and a transformer for cooling. However, because of the single furnace, I am afraid the system could be a single transformer system. Folks, it is possible to have a 2-transformer system with a single furnace?

Thanks in advance,
Eric.

eosei · Jun 29, 2009, 08:19 PM

The five independent wires connected to the White-Rodgers 1E56W-309 are: RC, RH, W, G and Y.

Thanks,
Eric.

hvac1000 · Jun 30, 2009, 12:03 AM

And what is your question?

No model number with the ending of 309 listed on the WR site

hvac1000 · Jun 30, 2009, 12:06 AM

Yes it is possible to have a two transformer system with a single furnace because in some cases the A/C unit has its own transformer making it a two transformer system. They are a bit rare but my system for the main house section does have two transformers.

If you only have one transformer you usually jumper RH-to-RC

eosei · Jun 30, 2009, 05:07 AM

Thanks hvac1000. You are really a Pro. The RC and RH terminals are not jumpered, so it is a 2-transformer system. Thanks a million and I shall replace the thermostat this evening and send you an update. Again, thanks.

Eric.

white-rodgers · Jun 30, 2009, 07:53 AM

Make sure you turn off the power to the systems before rewiring. It is easy to short the system out when replacing the thermostat. Good luck!

Tim Burke, White-Rodgers.
[email protected]

eosei · Jun 30, 2009, 08:44 AM

Thanks for your advice.

Cheers,
Eric.

eosei · Jun 30, 2009, 10:20 AM

Folks, I need a little help. On mu current White-Rodgers 1E56W-309 (Obtained from the inside cover of thermostat), the RED wire is attached to RH, black wire to RC, then white wire to W, green wire to G and yellow wire to Y. According to the installation instructions for the Honeywell VisionPRO 8000, the RED wire from the current thermostat, should be connected to C on the Honeywell VisionPRO 8000. Since I have RC and R terminals on the Honeywell VisionPRO 8000, I think it is logical to say that the RED wire should go R in the absence of RH on the Honeywell VisionPRO 8000, since the old thermostat had no C terminal. Please advise. I need to get this off the way before I install Honeywell VisionPRO 8000. Anyway, the terminals on the Honeywell thermostat are: RC, R, W, G, Y and C. The terminals on the White Rodgers 1E56W-309 thermostat are: RC, RH, W, G and Y. There is no jumper between RC and RH. Therefore it is a 5-wire heating/cooling system.

Thanks,
Eric.

hvac1000 · Jun 30, 2009, 01:01 PM

Here is your wiring diagram for the old stat.

http://www.white-rodgers.com/wrdhom/..._06_pg0191.pdf

And here.

I am sure you can transpose the wiring with the use of these to compare.
http://www.white-rodgers.com/wrdhom/.../0037-5327.pdf

eosei · Jun 30, 2009, 02:14 PM

hvac1000,
You are a genius. I came back and read one of your posts that said that keep it simple and match the existing wiring to your current one. I followed this simple advice and installed the Honeywell VisionPRO 8000 and it is working as I am writing to you.
Both furnace and air conditioner are working and I cannot thank you enough. Wherever you may be, may God bless you immensely. I already had the pdf installation manual for the White-Rodgers 1E56W-309. I needed somebody to confirm the two transformer system with a single furnace, you were the one that was able to explain stuff black and white for me. Again, thanks a million for your good work.

hvac1000 · Jun 30, 2009, 04:20 PM

Glad you got it working.