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Digital Thermostat

Heating, Ventilation & Air Conditioning Q&A

Digital Thermostat

Unread postby mountainman on Fri Apr 17, 2009 9:29 am

I have read and printed out several sets of directions for replacing OEM thermostats in TT and for the most part they are quite descriptive. I am about to tackle the task but in my case I have two sets of fan controls on my present thermostat, one for the heating side and one for the cooling side. I'm wondering if I will have to install two separate switches in addition to the other rewiring requirements.
Has anyone here faced the same problem?
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Re: Digital Thermostat

Unread postby Filthy Beast on Fri Apr 17, 2009 6:47 pm

Are you going to use a residential thermostat? If so, you would want one that has both a rh terminal and rc terminal. The RH terminal and the one that should be marked W for the heat. The RC and the Y terminal is for the cooling. The G terminal is use to control the fan on the AC. The only issue I can see is if you have a 2 speed AC fan. You could probably add and external switch for that. Unlike older digital thermostats that ran off of the 24VAC from the furnace, they run from batteries and use relays to switch the equipment on and off.
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Re: Digital Thermostat

Unread postby mountainman on Fri Apr 17, 2009 7:00 pm

Filthy Beast, thanks for that advise. Yes both the furnace and A/C have a low and high speed fan.
I'll use your info when I tackle the task.
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