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Wiring a fan motor on outside unit

I am having to replace the motor for the fan on my outside air/heat unit. I don't know what wire goes where. I didn't unplug the old one what do i do short of calling a pro?

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Hello Ky_dodge_gir.. In most communities, the wiring to that outside unit is fed with flex tubing that comes from a disconnect box mounted to the outside wall of the house. If yours is like that, open it up and pull the disconnect module out to disable power to the fan motor. Before working on it, verify power has been disabled ( I use an inexpensive volt meter or non contacting inductive power sense testor ..looks like a small flashlight and beeps/lights up if power is sensed in a wire lead). Once you are certain power have been disabled, you should be able to unplug the existing fan power connector from it's corresponding mating plug or (assuming you have the exact replacement fan) match color code wire for wire from the old to the new. The fan unit is a bolt in/bolt out assembly so that should be fairly obvious when working on it. Hope that helps you..

Posted on Oct 06, 2008

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Central air conditoner outside unit


Well, the answer is yes. I have seen a bad capacitor cause a fan motor to run backwards. BUT..... After replacing the capacitor and WIRING it up the right way, everything should be fine. A lot of aftermarket condenser fan motors are reversible, so it can run counter-clockwise (CCW) or clock-wise (CW). However, most factory fan motors come one directional and on your specific unit, the air should always push out of the top. Running the unit with the fan going backwards will actually some-what do it's job, but damage other components like the compressor because it runs at higher operating pressures than what it is designed for.

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If the circuit breaker is not tripped (and you have line voltage to the unit) - and your inside blower motor is running - then your problem is with the thermostat/or the wiring from t-stat to outside unit.
Could it be you don't have the t-stat set on "cooling," or possibly not set at a low enough temperature to allow the unit to be turned on? Note: your t-stat must be set 'below' the inside temp, i.e. if the room temp is 78 degrees - you must turn the selector to below 78, i.e. 75, 74, so on.
Check your low voltage wire going to the outside unit - usually a thin brown wire which encases 2 smaller wires (usually red and yellow) that goes to the 'starter relay' inside the outside unit. Make sure a dog hasn't chewed it in - two - or someone hasn't cut it with a weed eater. If this is the case, turn the t-stat to off, and un-plug the inside unit (furnace) and splice the wires back together.
You can do this fairly easy with a pair of cutters and if the wires are 'color coded' you will know which wire(s) to splice back together. Note: this is 24V wiring but still you should make sure power is off - because 24V can zap you sometimes - AND you want the power off so you don't 'cross' the wires and short out the transformer.
There is a chance that the thermostat is bad - but it is not likely, and in any event you'd probably need a serviceperson to diagnose this.







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Disconnect all wires to start.
1)Go out to unit shut off power and remove electircal panel.

2) Locate the terminal board where thermostat wires are connected. Write down where each color goes to
each letter and then try to do this at the thermostat.

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Shastalaker7

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1 Answer

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1 Answer

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