EWC Controls Forum

So, it sounds like the Lennox furnace is expecting a "dumb" thermostat to be hooked up to it directly, which would activate the compressor and the fan simultaneously when the thermostat clicks. EWC is trying to be smarter by blowing the fan over the evap coils a little before activating the ...

Customer has two story, 2 zone home with a BMPPlus3000. Complaint is a blower fan clunk when the air conditioner turns on, which I verified. The clunk happens because the fan on the Lennox gas furnace switches from low speed to high speed when the AC starts up. Thermostats are working fine, Lennox ...