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Home AC Compressor starts asynchronously with cooling fan
My home AC works OK, but I worry about outside compressor. It starts not synchronously with both fans (cooling fan on the compressor and on the evaporator). Sometime compressor starts before fans or continues to work several minutes when both fans turned off (they are both controlled by thermostat accordantly). It is quit when cooling fan is on, but it works so loudly when fan is off, that I afraid it can blow up ... Finally, the relay turns compressor off or both fans turn on . Where is potential problem: in capacitors or in relay? Any advice will be appreciated. Thank you.
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Normal ACs (non inverter) work in the following way
The AC compressor runs continuously till set temperature is reached in the room
The compressor then switches off, but the blower fan in the wall mounter unit keeps running. Durint this time the AC fan blows air out at Room temperature (which feels warmer)
When temperature of room rises then compressor starts running again. During theis period the air coming out from the inner uny is cooled by the condenser coils
And the process is repeated.... as long as you keep AC running
Ac works this way throught the operation period.
Now if you feel that your AC keeps switching off and on very frequently check the following
Your AC may be over powered for room *for example a 1.5 ton AC installed in a scenario where 1 ton is enough)
If there is voltage fluctuation in your area then the compressor may keep shutting don on large voltage swings
Solution: Get a Stabilizer
You have set the temperature setting too high. Max temp suggested for ACs is 25 degree Celsius, any higher will mean the compressor shuts down often. Remember every compressor shutdown and startup draws a high starting current
Set AC temperatures between 22 and 24 degrees Celsius
The thermostat/ Temperature sensor is faulty
Get unit inspected by Authorized technician
There is dust buildup on the outer unit / compressor unit. The dust buildup may cause overheating by preventing efficient heat exchange, This may lead to overheating of compressor and it shuts down to, prevent damage to itself
Get unit serviced by Authorized technician
The fan motor of the outer unit is not working properly
Get unit inspected by Authorized technician
Remember to get the AC serviced at least thrice a year to ensure smooth operation
Cool Thoughts... Cool Life !!!
Have you checked the wire terminals at the compressor. They tend to get very brittle and burn up rather frequently. Have you checked for voltage at the compressor terminals once the relay closes? If you have 220V at the terminals its working properly, most likely your compressor is shorted. Pull the wires of the terminals and check their resistance/continuity. If they are OK check for a short between the housing and each terminal, there should be no circuit to ground at any terminal, if there its shorted, need a new one.
You will have to find the contactor which is located in the outside unit. And check the voltage at the contactor, 26 v as this is the thermostat calling for the compressor to come on. You can also push in the contactor and see if the fan and compressor start. There should be an outside fuse box close to your condensing unit. Good luck
The fan and the compressor both run off of the same circuit. Have your husband remove the cover on the condenser coils and check for power at the leads that go to the compressor off of the latching relay. If there is power there, then he needs to check the start capacitor or possibly the thermal overload switch (mounted on side of compressor)
sounds like your contactor is stuck closed.This is the part that high voltage connects to and lets power through to the compressor and condenser fan motor when you get a call for cooling.If you go to pull it out,kill the power outside AND at the furnace.
Fuses are a protection device and I guess that this is for the condenser section and compressor. If they blow right now when it is turned on would indicate that there is a short in the wiring or motor or compressor. If it trys to start and the outside fan starts and the compressor just humms and blows fuse, you have a locked compressor. Might check run capacitor or install a hard start kit and see if it will brake it loose, if not bad compressor
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