Question about Carrier 52CQ-312-4 Comfort Series Heat Pump Air Conditioner

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Condensor fan not running after replacement

Replaced the condensor fan motor on carrier heat pump. rewired with new capacitor and still not running. compressor is running until it reaches it's high pressure cut off point. curious of the circuit board.

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Check fan rotation

Posted on May 31, 2009

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You can try this. Remove the cover, spin the fan by hand and see if the motor runs well after this, if so, the capacitor or motor condensor is bad or has defective wiring. Replacing it should take care of the problem. Some capacitors are split capacitors, have two values and serve both a fan motor and the compressor. In this case, the unit can be rewired for individual capacitors or the split one replaced.

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If it does not have any oil ports, you are bqasically down to replacing the motor.

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Fan motor runs backwards


Make sure the capacitor is connected to the start lead, not the run lead(s). Also some fans come with some wires you can switch to reverse the direction. If your motor has them there will be 4 and the label on the motor will tell you how to connect them. Let me know if you need more assistance or if this helps.

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When the unit is in heat mode is the fan on the outside supose to run? Capacitor on outside and inside have been replace fan was running when capacitor was first replaced.


Hi, and the outdoor condenser fan should not be on at all in the heat mode unless this is a heat-pump!! So, I can see that this is a 3-ton Carrier split system and I haven't pulled up any information on it, only if I need to. But if the indoor unit runs on natural gas/propane, this would not be a heat-pump and the outdoor fan would run only in the cooling cycle. So, if it is not gas fired it is a heat-pump, and yes the outdoor unit should be up and running all year around. On a heat-pump you will have what is called a reversing valve in the refrigerant system that directs the flow of freon in the right direction for the season you are in. Most all heat-pumps will have a heat strip package installed in unit for emergency and aux. heat if compressor lets say fails. You're thermostat will have on it a selector switch, you will see on it these labels, Aux., emergency heat, auto/on/off/heat/cool. You will know from what I have just went through with you what you have. Forgive me for such a long explanation as I like my customers to understand more about there units in question. I could have just said yes or no and thanks? Doesn't work like that for me. I hope this has helped you out. One thing, If you determine this is a heat-pump and the fan is not on when in heat, you may have lost this condenser fan motor? You say both run caps. were replaced, and normally when you loose a run cap for a motor they will open internally, leak, buldge ect. So if this is taking place, if you can yourself take a look at the run cap. Also, make sure you have 220 volts to condensing unit. If not, check breaker probably a 30 amp double pole to see if it has tripped. You will have a disconnect box at the unit and inside there will also be 2 fuses. If you see only a pull out square connect, the fuses are still there but in behind the cover. If you have power and can hear the compressor come on but fan does not, I am positive you will have A faulty run cap, or faulty motor. Kill power to unit and try and slide a metal coat hanger down to prop or blade to see if it spins freely. If it is hard to turn bearings are froze up. If the capacitor seems to look ok, and the motor does spin free, It still may have open windings. Do these checks I have asked of you on power to the outdoor unit. If all is good, Stand in front of the unit and have someone turn the stat on for what season you are in. Lower or raise temp a ways above or below room temp. You should her the contactor close and compressor will start along with the condenser motor.If compressor starts and motor does not, then I would say it has failed and or cap again. When a motor is replaced, the run cap must always be replaced to!! Please get back to me and keep me posted. I will wait to hear what has happened. Good Luck.
Sincerely,
Shastalaker7

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it sounds like the capacitor is shot there is usually a duel capacitor one side is for the compressor and the other side is for the condensor fan motor if it is bad the motor will over heat and turn off on internal overload

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Condensor fan failure! will run if you spin by hand. rpne 24 2ton heat pump do they have a bad run of fans or cap


It could be the capacitor (most of the times) or the fan motor itself Put a new caoacitor and see if it runs without your help if doesn't replace the motor with the same hp and rpm and if the new one is rebersible make sure is blowing out.

Aug 08, 2009 | Heating & Cooling

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