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I would like to use the blower on my Amana 80 SSE gas furnace to circulate air through my house. I'm good with electricity and wonder if it is possible to install a simple switch to get power to the fan.

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  • neil418 Jun 07, 2010

    it works! Thank you



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Your thermostat should have a fan switch as most of them do. Simply switch the switch from fan auto to fan on and the indoor blower should run non-stop.

If your thermostat does not have this function, then the easiest and simplest way to do it would be to install a new thermostat with a fan switch. This would also be a good time to install a programmable thermostat and have better control over your comfort...

Changing the thermostat is quite easy. Shut off all the power to the furnace and AC and follow the directions with the new thermostat. Restore power, program the thermostat if needed and test it out. I recommend Honeywell thermostats...they are the most user friendly thermostats that I have found and don't fail as quickly as some of the other brands found at stores.

Posted on Jun 06, 2010

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  • neil418 Jun 06, 2010

    My current honeywell thermostat is a CT87N4450 with two controls. The left lever is Cool - Off - Heat and the right is Fan On - Auto.
    There are only two wires connected, The R & Rc connections on the thermostat are connected to the W contact on the furnace, and the W contact on the thermostat is connected to the R contact on the furnace. This was done by the installer, and appears to be backwards, but the furnace has been running fine like this for years. The cable has four wires, two of which are not in use.

    The contacts on the furnace are: Y W R G C
    The contacts on the thermostat are: R Rc O G W Y B

    Can you tell me the correct wiring to make the fan run independent of the heat, and what the thermostat settings should be please.

  • Bill Jun 06, 2010

    Here is some more information for you.

    The R terminal is for the 24V. The two R terminals should be wired together. The R and Rc should be jumpered.

    The W terminals are for the heat. The two W terminals need to be wired together.

    The G terminal is for the fan. The two G terminals need to be wired together.

    The Y terminal is for the Air Conditioner. The two Y terminals need to be wired together.

    The two common terminals need to be wired together as well.

  • Bill Jun 06, 2010

    Make sure that your B terminal on the thermostat is for a common. It typically is for the reversing valve in which case you will not have a common terminal and don't need to wire it up. But if you match the other 4 wire for wire and provide a jumper for the red at the thermostat, then you should be at factory wiring and ready to test it out.

    Again, ensure you turn off the breakers to the unit before switching the wiring. Failing to do so could blow a fuse or the transformer inside the unit.



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