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I need help again. The church members liked the Programmable thermostat installation in Angels Retreat so well they want one in the Church office now. The old thermostat there has 4 wires, RC, G, W, and Y. It's controlling a heater only, no air conditioning. I'm thinking I need to connect the old...
Okay I have a mercury thermo that I was trying to replace with a digital Honeywell thermo. I have a Rheem furnace & outside A/C unit. I'm assuming this is a "conventional system"? The wires don't match up according to the installation manual so this is what I have: Original Thermo: ...
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