We recently bought a 20 year old home with two 11ish year old Armstrong 95% furnaces models G2D95AU. Just before closing, along with invoices for a bunch of repairs from the inspection, the previous owners included a bill from their HVAC contractor. It seems they had a service call on one of the units not blowing any cold air. Tech determined blower was shot and replaced it with what they called an "emergency" or "rescue" motor.
I wondered a bit when I saw this, so I called the contractor to ask if this replacement would allow the unit to operate as it should. Whoever I talked to explained that it was just a generic motor rather than an OEM and the unit would operate just fine.
After living here for a month and noticing the blower fan is really noisy compared to the Westinghouse 95% we had at previous house, I decided to read the furnace owner's manual and look at the furnace. Seems the replacement motor is wired just to the "CIRC" hot and "CIRC" neutral terminals. It also has a capacitor sort of black taped to the wiring harness that doesn't look factory installed.
So, I guess what they did was to effectively change the blower from a variable speed unit to a single speed? Will this work very well when we get to heating season - according to manual this is a 2 stage unit that should have a low and high blower speed that depends on the fire level? And maybe a higher speed for cooling?
Bottom line, do I have a mess on my hands?
Thanks for any light you can cast...