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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
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∙ 11y ago
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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.
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what causes compressor lockout in voager rooftop unit.
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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.
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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.
Does the three wire live neutral and earth that run from the aircond unit to the compressor carry current?
All of the 3 wires connected to the compressor motor terminals will carry current while it is running. Depending on the method the mfr uses to cycle the compressor (breaking one or both power legs) some of the wires may remain `Hot` while it is off. A wiring diagram specific to the unit in question will answer that. By earth I assume you mean the ground or green wire, that wire is never intentionally powered.
How do you know if your AC compressor is over chaged?
If the unit was freezing the evaporator before you charged it and now you do not have cooling, you may have overcharged it. The best way to determine this is to have a certified AC technician check the actual pressures of the system as most do it yourself cans do not have acurate gauges. The compressor may run constantly, but not cool or the compressor may run and then blow a fuse or the compressor may run and there is no cooling, but the only way to acurately determine an overcharge is to measure the pressure with accurate gauges.
You can hear the condensing unit outside is there a way to quiet the unit?
Try putting a sound blanket over the compressor. Will that make the compressor run hot?
