lightsycle
Jul 8, 2007, 07:47 PM
Ok Guys,
I found the thread about the switch for fan only by jumping the G to the R with a toggle switch. It worked. The fan comes on to circulate the air, at high speed. When the heat comes on it uses another speed which is a little slower. I know this because when I turn on my switch I get massive air movement, and a noise that can only be described as bad exhaust sputtering noise. I have a white roberts thermostat for heat and air, and a coleman GM8S gas furnace 40MBU in 32 out. I want to have the fan running either on the toggle switch or the thermostat to use the same speed that it uses when it is heating. On the unit end of the thermostat wires (2 only BTW, red and white) on the circuit board the red wire is on the R and the white is on the W, HA! On the thermostat itself I have red to B and white to W. RC and RH are jumped. Is there a way to have to thermostat activate the fan only w/o heat, or have my installed toggle switch use the low speed? the purpose is to circulate air w/o the horrible annoying noise. Unit has Y1,Y/Y2,G,C unused, and thermostat has G, O, and A unused. Y goes to the back side of the cool-off-heat switch, I think. I can include pic of both if it would help. There are jumpers on the circuit board that say fan speed - lo cool pins have been cut off, next is heat and hi cool.
Thanks
I found the thread about the switch for fan only by jumping the G to the R with a toggle switch. It worked. The fan comes on to circulate the air, at high speed. When the heat comes on it uses another speed which is a little slower. I know this because when I turn on my switch I get massive air movement, and a noise that can only be described as bad exhaust sputtering noise. I have a white roberts thermostat for heat and air, and a coleman GM8S gas furnace 40MBU in 32 out. I want to have the fan running either on the toggle switch or the thermostat to use the same speed that it uses when it is heating. On the unit end of the thermostat wires (2 only BTW, red and white) on the circuit board the red wire is on the R and the white is on the W, HA! On the thermostat itself I have red to B and white to W. RC and RH are jumped. Is there a way to have to thermostat activate the fan only w/o heat, or have my installed toggle switch use the low speed? the purpose is to circulate air w/o the horrible annoying noise. Unit has Y1,Y/Y2,G,C unused, and thermostat has G, O, and A unused. Y goes to the back side of the cool-off-heat switch, I think. I can include pic of both if it would help. There are jumpers on the circuit board that say fan speed - lo cool pins have been cut off, next is heat and hi cool.
Thanks