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Unexpected wiring found on existing thermostat

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Hi, I am replacing my thermostat. I've attached a photo of the existing wiring and new wiring. 1. Why is

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Old 03-20-2010, 11:31 PM
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Default Unexpected wiring found on existing thermostat
Model Number: Trane XE80   Brand: -other-   Age: 5 - 10 years   

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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


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