I have a forced air gas furnace, no air conditioning. The old thermostat had only three wires, red (24V), white (heat) and green (fan). It worked fine, and allowed me to independently switch on/off the fan (which I never do) as well as run the heat.
The Honeywell control module recently went out so I had a licensed HVAC contractor come replace it. While there, I showed him an Insteon thermostat I had purchased earlier (without installing it because I didn't have a common), and he connected a common (blue) wire to the control module and ran it to the thermostat. He connected the Insteon thermostat, and it seems to work...sort of.
It gets power and I can cycle through modes, set the clock, etc.
I can turn the fan on and off.
I can turn the heat on, and it works, but in a weird way.
Pre-fan comes on, lighter sparks, I hear the flames swoosh. Some time goes by, and the blower turns on, but it seems like the burner goes out at this point because while the air coming out of the vents is warm, it's not hot like it used to be. After some time with the blower going, the blower stops and I can hear the burner light again. With the old thermostat, the heater ran continuously until the set point on the thermostat was reached. It's not doing that now, it cycles on and off as described.
The instructions say I *must* use a five wire system, and if I have only four wires, I need an add-a-wire. Looking at the manual for the add-a-wire, I can't figure out how this will help. It lists instructions for AC, heat pump, etc. but not a situation like mine.
Does this have to do with the two stage heat, and can I maybe jumper the two stages together at the thermostat to make it do what it's supposed to do?
Thanks in advance.
-Kirk
The Honeywell control module recently went out so I had a licensed HVAC contractor come replace it. While there, I showed him an Insteon thermostat I had purchased earlier (without installing it because I didn't have a common), and he connected a common (blue) wire to the control module and ran it to the thermostat. He connected the Insteon thermostat, and it seems to work...sort of.
It gets power and I can cycle through modes, set the clock, etc.
I can turn the fan on and off.
I can turn the heat on, and it works, but in a weird way.
Pre-fan comes on, lighter sparks, I hear the flames swoosh. Some time goes by, and the blower turns on, but it seems like the burner goes out at this point because while the air coming out of the vents is warm, it's not hot like it used to be. After some time with the blower going, the blower stops and I can hear the burner light again. With the old thermostat, the heater ran continuously until the set point on the thermostat was reached. It's not doing that now, it cycles on and off as described.
The instructions say I *must* use a five wire system, and if I have only four wires, I need an add-a-wire. Looking at the manual for the add-a-wire, I can't figure out how this will help. It lists instructions for AC, heat pump, etc. but not a situation like mine.
Does this have to do with the two stage heat, and can I maybe jumper the two stages together at the thermostat to make it do what it's supposed to do?
Thanks in advance.
-Kirk
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