Replacing wheel blower on an american standard gas furnace commercial model TDD120C960A0
This is for the main blower right? if so...
You'll want to have the replacement parts around for this, usually the only thing to break is the motor, but occasionally the squirrel cage will bust up.
First unplug the unit, then proceed to disconnect everything in the path of the blower assembly. Take note of exactly which wires go where and whatnot (taking a picture is a good idea).
The assembly itself sits in a track and is held in place by 2 1/4" hex head screws. remove those then slide the entire assembly out of the unit.
Loosen, with a small Allen wrench, the little screw holding the motor shaft to the squirrel cage.
The motor is held to the assembly with a few bolts, easy to spot, they should be 7/16th hex heads.
Remove those completely, undo the ground (green wire) then drop the old motor out of the assembly. This may be very difficult (Use the weight of the motor to your advantage).
If your squirrel cage looks fine (no broken pieces) then all you need is the new motor.*
You'll need the harness from the old motor, strap that on in the same position as it was on the old motor.
Slide the new motor into the assembly and bolt it in with those 7/16th heads. then position the squirrel cage on the shaft in a way that it rotates freely and easily, as centered as it can be, then tighten the little allen head... super tight, you don't want that to come loose.
Then slide the whole assembly back into the furnace and reverse all that previous undoing.
*If the squirrel cage needs replacing, remove the old one (it'll just pull out once you've undone the motor and a few small screws) slip the new one in, and continue.
If the wires from the motor seem confusing, green is the ground (put a loop on it and screw it to the assembly), the rest go to the circuit board. White is Neutral, Red and Yellow are spares, Black goes to "Cool" and Blue goes to "Heat". I can't remember the name of those types of plugs, but they're often available at auto parts shops. You want the 1/4" size. the neutral may be the 3/16" or 1/8th size.
May 06, 2011 |
Dayton Gas Furnace Heater