Any HVAC guys out there?

bx24 · Jun 15, 2008

If you have seen the news in the last week, just south of Indy we got 10" of rain in two hours last week. I am in the process of cleaning out my garage which got almost 2 feet of water in it. I have been storing an old furnace in the garage with the plans to one day take out the blower to be used for just such drying applications. I finally pulled the blower out today and unfortunately, wiring 120 vac to the black and white leads did not deliver any results. This motor was above the water so that is not the issue. Based on the picture, does anyone know what two leads I need to wire "hot" to get this thing to blow?

Thanks

dqdave1 · Jun 15, 2008

Hard to tell about the wiring; but a wiring diagram should be on the motor housing. Just guessing, but two brown wires go to a start capacitor; and then you will use a common wire and pick which speed you want from remaining wires.

ns_in_tex · Jun 15, 2008

If there is not a capacitor mounted somewhere on the blower housing, you should try to read the motor nameplace label. Probably will have to pull the blower wheel & motor, then remove the band around the motor to be able to read all of it.

There may also be a wiring diagram on this motor label.

It the blower came out of a gas furnace, most likely is 120 volt motor. If electric furnace, probably is 220 volt motor.

The 2 brown wires probably should go to a run capacitor, size to be determined from motor nameplate label.

White wire is probably the common wire & connects to the neutral (white) wire if motor is 120 volt. (one of the 220 volt hot legs if 220 volt).

Black wire is high speed & connects to hot leg of 120 volt (other hot leg of 220 volt).

Red wire is low speed ( cap off without connecting to anything)
Blue wire is medium speed ( cap off without connecting to anything)

If motor is operating out of unit, it will probably overload the motor & shut down on internal overload after running a short while. Air flow should be blocked at either intake or output till motor pulls no more that full amp rating on motor nameplate.

Hope this helps.

kenmac · Jun 15, 2008

The 2 brown wires are for start the capacitor. the white wire is netural, the black is high speed blue wire med. speed, red wire is low speed. I have a 4 ton with thermostat in my attic that I use to pull or blow out the heat in my attic

bx24 · Jun 15, 2008

ns_in_tex said:
If motor is operating out of unit, it will probably overload the motor & shut down on internal overload after running a short while. Air flow should be blocked at either intake or output till motor pulls no more that full amp rating on motor nameplate.

Thanks everyone. The motor is out of a gas unit so I am assuming the 120 vac part. I did not even consider the overload part. I will get an amp reading to see how it compares to what it should be .... Thanks