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03-20-2010, 10:31 PM
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Unexpected wiring found on existing thermostat
Model Number: Trane XE80 Brand: -other- Age: 5 - 10 years
Hi,
I am replacing my thermostat. I've attached a photo of the existing wiring and new wiring. 1. Why is the existing thermostat wired backwards (R --> W and W --> R)? 2. Why is G (fan) controlled by a relay and switch located in the basement rather than the thermostat? Is it for mechanical 2-wire thermostats? 3. Is the new wiring reasonable? R --> R W --> W G --> G C --> C Thanks for any help! Brian Other details: Trane XE80 natural gas forced air furnace with White Rodgers 50A65-475 ignition control board Current thermostat is a LUX 1500 New thermostat is a HAI RC-80 My place is a townhouse condo built 1999 in Calgary, Canada If attachment doesn't work: FurnaceWiring Ads By Google Related Models 
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