
Originally Posted by
letmetellu
There are several way that a furnace uses to turn the fan on. It all depends on what brand and type of furnace you have .
Some use a time delay system, after your thermostat is turned on the relay waits for several seconds to turn on the motor to the blower, this can range from 60 seconds to 90 seconds.
Another way it a bi-metal switch. as the metal get hot it switches to make to contacts make contact and turn the motor on. There are other ways so it would help if I knew what furnace you had and maybe a model and serial number.
LENNOX GAS PACK - 80,000 BTUH
Model #: GCS20R-411-100-4P
S/N : 5695B 03663
Has a date at bottom of label - 1992. Has this thing about seen it's better days? I had a rep (part time) come check it out Friday but said he couldn't find anything wrong with it. I've called several other companies and all are tied up right now. It's hard to find good, if any, H & C reps in this area. One suppose to be here later this afternoon. I'm trying to get a head start of repairing it myself if this person doesn't show or repair it.
So, I really appreciate you taking the time to help me.