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Old 08-06-2013, 03:51 PM   #1
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TR 21-12 Thermostat Wiring

We are new owners of a 72 Land Yacht 31 Foot Ssovereign with a Armstrong TR 21-12 air unit. It works great but only has one speed. HIGH and will freeze you out. I think I have read that the low speed is an option that can be had by changing the wiring on the thermostat. We have a HoneyWell T819C and the base plate is Q634F10001 The wiring on this base plate is Black to G2 and Black to Y and Red to R and Green to G1 Anybody got infomation on the wiring that we could use to test the speed of the fan option.
Looking forward to many miles and smiles on the road.
BobFisher is offline   Reply With Quote

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