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I have a vintage 1972 flame master furnace that does not have a manual switch to turn on the fan. I would like to put in a newer thermostat with a switch to control the fan. There currently is 2 wires from the furnace to the thermostat and the newer thermostat requires three. where on the furnace would I connect the third wire to ,to allow me seperate control of the fan.

Submitted: 314 days and 2 hours ago.

Category: HVAC

Value: $15

Status: AWAITING CUSTOMER ACTION

Already Tried:
this is a furnace in a house not a car

Posted by coolman1973 314 days and 1 hours ago.

Answer

Hi, u are going to need a seperate relay and a new wire from the furnace to tstat. this is not something easy to do . this not something u should even try without expereince. but check on the furnace and see if there is a fan switch that will keep the fan on. also check the high limit switch in the furnace it looks like a dial, that might have a button on it u can push or pull for fan operations.happy new year

313 days ago.

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there wqas another fella that responded also and I accepted his response and authorized payment to him.
sorry

Answer

no prob

Expert:	coolman1973
Pos. Feedback:	95.9 %
Accepts:	334
Answered:	12/31/2008

Hvac tech and Mechanic

15 yrs field exp/5yrs supervisingexp/ Nate and Epa cert.

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Already Tried: this is a furnace in a house not a car

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there wqas another fella that responded also and I accepted his response and authorized payment to him. sorry

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no prob

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Already Tried:
this is a furnace in a house not a car

there wqas another fella that responded also and I accepted his response and authorized payment to him.
sorry