0
Assuming that the compressor is a single phase unit, please do the following.Disconnect all the connections of the compressor. Using a good multimeter, measure the resistance between the 3 terminals. Lets call the terminals as A,B and C.
Measure the resistance between A-B, B-C and C-A in ohms. The lowest resistance will be between the Common and the Running Winding. The highest resistance will be between the Running and the Starting Winding.
In the above example, lets say A-B is 5 ohms, B-C is 10 ohms and C-A is 15 ohms. Then A-B is the running winding which means either A or B has the common terminal. As C-A is 15 ohms which means C-A has the starting and the running terminal, it is confirmed that B is Common. Hence, in ABC, A will be the running winding, B will be Common and C will be Starting winding.
Hope this helps
What else can I help you with?
How do you test a Compressor if good on HVAC unit?
With an ohm-meter. Check for continuity in the RUN and START windings, and also from the terminals to compressor case for shorting. There should be continuity in the windings and no continuity from windings to compressor case.
Can bearings in a compressor be repaired?
No, not by the average home mechanic. Bad compressor? Replace the entire unit.
What causes compressor to lock out ina home ac?
what causes compressor lockout in voager rooftop unit.
Can you rebuild a compressor for home AC unit?
No the compressors in residential condensing units are called hermetic compressors and have to be rebuilt by cutting open the compressor shell, then rebuild the compressor and then weld the shell shut. Buy a new compressor or condensing unit.
How is central unit connected to the thermostat and the compressor unit?
In most residential systems, the home thermostat is connected to the interior air handler unit which is then connected to the exterior compressor.It is common to see control wiring from the compressor unit following a freon tube to the interior unit.
Does the compressor come on if you have the fan only running on your home ac unit?
Yes your compressor comes when you set your thermostat to "Fan" setting and you have it on cool setting.
Where is the compressor located in an AC unit?
The compressor in an AC unit is typically located outside the building, near the condenser unit.
Where is the compressor located on an AC unit?
The compressor in an AC unit is typically located outside the building, near the condenser unit.
Can you use 3 split ac unit on one compressor unit?
Up to 2 forced air units to one compressor unit.
What causes a home air conditioning unit to not turn off?
A stuck compressor contactor. Do not turn off the indoor fan until you have either shut off the breaker or pulled the fuses to the outdoor unit and stopped the compressor, or damage may result.
If you replaced your compressor less than 90 days ago and the unit doesn't work again if the entire unit is replaced can you reuse the compressor or return it?
You cannot return the compressor unless it is the reason your system is not working. No need to reuse the compressor as you will have a brand new unit anyway.
What is the function of the air conditioning compressor contactor in regulating the flow of electricity to the compressor unit?
The air conditioning compressor contactor controls the flow of electricity to the compressor unit, allowing it to turn on and off as needed to regulate the temperature in the air conditioning system.
