Wiring for 'Fan Only' for thermostat


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Old 11-30-11, 12:18 PM
L
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Wiring for 'Fan Only' for thermostat

I have an Armstrong Ultra-80 oil furnace and a Honeywell programmable thermostat.

My oil bills killed me last winter so I put in a Natural Gas 30000 BTU Blue Flame heater that is doing a pretty good job heating my 1500 sqft house.

It might do a better job if I could use the fan on the Armstrong to circulate the air but the wiring from the thermostat to the furnace is only 2 wire.

Both my furnace and thermostat have YCGRW terminals and the the 2 wires are connected to the RW terminals.

Running a new cable is not a problem. Do I need to connect all 5 terminals on both the furnace and thermostat to control the fan?

If not, what needs to be wired? Thanks.
 
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Old 11-30-11, 04:54 PM
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To include the fan control with the heating only requires only that the G(reen) wire be connected at each end. I will state though that if you are going to pull in a new cable you might as well use a cable that has at least five conductors.
 
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Old 11-30-11, 05:35 PM
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Originally Posted by Furd View Post
To include the fan control with the heating only requires only that the G(reen) wire be connected at each end. I will state though that if you are going to pull in a new cable you might as well use a cable that has at least five conductors.
Great, thanks. I will probably pull through some 4 pair Cat5 cable that I have and use that.
 
 

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