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Switching the wire from W to G on both the thermostat and controller board allowed me to use the fan in the summer while disabling the heating call (W). For the winter I'll switch it back since it's a heat-only unit. Otherwise an extra wire from G(thermostat) -> G(controller) would have been needed.


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I presume you want to do this just to circulate air? Do you have a thermostat connected to the furnace? If you do, you might have an option to turn the blower on manually. If so, you could set the system "off" (cooling, heating, off), then turn on the blower and let it run without worrying about the furnace continually triggering the igniter or locking out. ...


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Doing this with my system (York ~2002) will blow a fuse, probably because the igniter keeps trying to light a nonexistent gas flow. Your mileage may vary.


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No, it should cause no damage at all. However, if the unit is switched into heating mode, it could (should) eventually go into lockout. At which time you'd have to follow the procedure to get the unit out of lockout, which varies from unit to unit. If you're looking to circulate air, turn the FAN setting on the thermostat from AUTO to ON. This will turn the ...


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It might cause harm if the furnace were trying to ignite in which case the igniter will die prematurely. If only the furnace air handler blower is running, having the fuel off is completely fine.


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It sounds to me like the 'return vents' are actually exhaust vents from the heater. My attic heater has a return duct directly below the heater at floor level in the living room. The filter is in front of this return duct (20" X 30" filter). There should be a rather large flange on the bottom or side of your heater for the return duct to attach. It ...



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