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Shaded pole motors are cheap.
Replace it
Check inducer motor for wear
Wheel is free of debris
What are the 2 types of blower motors?
Direct drive and belt drive
ECM
Electrically commutated motor
120V is converted to three phase pulsed DC with 24Vac signal to motor
Permanent magnet
The motor is just a 3 phase motor. You can ohm out all three legs.
High static pressure kills them
If you close of diffuser or the furnace is oversized, filter is bad
Pressure switches
You cant jump them out because it knows…
On a 208Vac system what happens if you are trying to diagnose a system if you are checking the system to ground?
120V shows up everywhere
Roll out switches are manual reset? T/F?
True
How do you clean the a flame sensor?
Scotchbrite pad or 000 steel wool.
On a carbide HSI what can happen?
Hot spot shows up as a white spot.
check with amp clamp
Nitrite HSI are smooth?
Yes
Carbide one is rough
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