how to change motor speed?

Old 06-23-01, 08:08 AM
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i have a magic chef forced air furnace model number#g66-75d2c2-5. air just trikles out the vents and would like to know if it is possible to change the blower motor speed. wiring diagram shows low medium and high settings.
Old 06-24-01, 12:46 PM
lynn comstock
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Changing motor speeds:


The standard colors for the speed changes are:
Med =blue
Low =red
Capacitor=brown or brown/white stripe
The White or Yellow wire will be Common to any speed. DON"T mess with the Common wire.

If the black wire is connected, it is already configured for high speed (See my HOWEVER). Only one of the speed wires is to be used. If another color is connected, TURN THE POWER OFF, and connect the high speed wire (black) to the same location. Tape off the wire that you remove.

WARNINGS: Sometimes the equipment is wired using 2 speeds...a lower speed for heat and one of the higher speeds for cooling. Sometimes the extra speed wires are parked on a dummy terminal. If this is the case you can swap positions of the wires. I hope you can tell the difference by reading the wiring diagram. It is possible to smoke the motor in a split second if you find the correct WRONG way to wire it up.


HOWEVER: it is highly likely that the filter, indoor coil, or blower wheel (or all three) are dirty and restricting the airflow. Even if you pay to have your equipment serviced, most companies omit the regular cleaning of the indoor coil because it is difficult and costly to do.

Price shoppers are turned off by a maintenance service quote that includes this service. Techicials are turned off by the work itself. Owners are turned off by the liabilities of making a mess, water spillage and water damage to electrical parts.

Since units are usually oversized a lot, this maintenance can be defered for years without comfort being compromised too badly. POWER consumption is another story. The dirt accumulation jacks up the cost of operation until the homeowner finds a problem with the ability to cool.

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