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Compressor will not start - Heating & Cooling

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Hard Start Capacitor A hard start capacitor, its only purpose is to add...



Hard Start Capacitor
A hard start capacitor, its only purpose is to add additional starting torque when the compressor is starting and for just a few milliseconds.
It is wired thru a normally closed set of points in a potential relay and in parallel with the run capacitor, when the compressor is starting the start capacitor is in the circuit adding additional starting torque to the compressor, when the compressor reaches a certain speed it generates enough back EMF (voltage) to energize the potential relay coil and open the normally closed set of points and take the start capacitor out of the circuit and then will stay open, keeping the start capacitor out of the circuit as long as the compressor is running. The hard start capacitor is only in the circuit or working for a few milliseconds, it’s not doing anything once the compressor s back EMF opens the potential relay coil.
These potential relays have different cut in and cut out voltages, so the same relay won’t work with any compressor and may actually damage the compressor or shorten its life if you don't use the right potential relay. The compressor manufacturer and the local parts store list the correct capacitor start relay and start capacitor for every compressor and now they are putting the information on the compressor on the nameplate with the model and serial number.
As a rule of thumb you can use a capacitor or start capacitor within 10% of its rating if you can’t get the correct one.

on Feb 17, 2010 | Heating & Cooling

1 Answer

My Whilrpool AC Model number ACM102XJ0 fan is blowing air but it's not cooling.


Air conditioner compressor will not start. When power is applied to the air conditioning outdoor unit the fan starts, but you hear a sound like the compressor is trying to start, "UGGG"..., for about 5 to 10 seconds and then all you hear is the outdoor condenser fan run. The compressor is locked and will not start. What is happening is the compressor is trying to start, but because the compressor motor is locked it tries to start for a few seconds and then because of the high amperage being drawn goes off on internal overload. The internal overload protects the compressor windings from overheating and burning up. I see this many times during the start of the air conditioning season. Some compressors just have a hard time starting after sitting all winter long. Many times I can get the compressor started again without having to buy a new compressor by using the device known as a "Super-Boost." I keep two or three of these on the truck. They have saved many of my customers from having to buy new compressor


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Aug 01, 2011 | Heating & Cooling

1 Answer

Carrier ac model 38ckc does not cool properly. Outside unit runs but air coming out of the top is cooler than the other units that we have. Just had a service replacing all the filters and coolant checked...


Air conditioner compressor will not start. When power is applied to the air conditioning outdoor unit the fan starts, but you hear a sound like the compressor is trying to start, "UGGG"..., for about 5 to 10 seconds and then all you hear is the outdoor condenser fan run. The compressor is locked and will not start. What is happening is the compressor is trying to start, but because the compressor motor is locked it tries to start for a few seconds and then because of the high amperage being drawn goes off on internal overload. The internal overload protects the compressor windings from overheating and burning up. I see this many times during the start of the air conditioning season. Some compressors just have a hard time starting after sitting all winter long. Some compressors are locked up so bad that I can not start them and must tell my customer that they need a new compressor . Many times I can get the compressor started again without having to buy a new compressor by using the device called, "Super-Boost." I keep two or three of these on the truck. They have saved many of my customers from having to buy new compressor

Jun 20, 2011 | Carrier 38CKC036 Air Conditioner

1 Answer

My compressor is not turning on the fan is going but the compressor wont kick on what could be wrong it was working fine just an hour ago


Air conditioner compressor will not start. When power is applied to the air conditioning outdoor unit the fan starts, but you hear a sound like the compressor is trying to start, "UGGG"..., for about 5 to 10 seconds and then all you hear is the outdoor condenser fan run. The compressor is locked and will not start. What is happening is the compressor is trying to start, but because the compressor motor is locked it tries to start for a few seconds and then because of the high amperage being drawn goes off on internal overload. The internal overload protects the compressor windings from overheating and burning up. I see this many times during the start of the air conditioning season. Some compressors just have a hard time starting after sitting all winter long. Some compressors are locked up so bad that I can not start them and must tell my customer that they need a new compressor . Many times I can get the compressor started again without having to buy a new compressor using a device called, "Super-Boost." I keep two or three of these on the truck. They have saved many of my customers from having to buy new compressor.

Jun 20, 2011 | Goodman CKL36AR36 Air Conditioner

1 Answer

Compressor restart procedure


Hello, Many people have had problems with their refrigerator compressors not starting and wonder what may be the problem. Many times the problem can be traced to the start components. The start relay and the start capacitor work together to help the compressor get started. By giving it a short extra shot of higher voltage current, it gives the compressor the kick to get it turning up to speed.

The capacitor is the long round tube on the top of the box that houses the compressor terminals and the start relay.

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The start relay is pushed right onto the compressor terminals C and R. It also has two wires that go up to the start capacitor.

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The relay can be removed by just pulling out on it away from the compressor off of the pins.

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If your refrigerator compressor is not starting, you can change the start components easily, to see if they are the problem. Usually you will have about a 50-50 chance of the compressor working again by changing these parts.

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If you are looking for the configuration of the compressor terminals, here is a picture of the terminal cover that shows which terminals are where.
Thanks

Jul 02, 2010 | Whirlpool 19.8 cu. ft. Side-by-Side...

2 Answers

Refrigerator still makes clicking sound and does not cool after bad start relay was replaced


Couple Video How To Replace Compressors. I Think Its Not DIY.
Hope Thats Helps.

Aug 12, 2009 | Refrigerators

3 Answers

Please help our ac compressor wont come on


Hi, did you change, capacitor for compressor too. check compressor overload switch,(relay) normally located on compressor terminals, (where you connect wires to compressor) that's the device that goes klix when compressor goes to start, could be faulty, or maybe low voltage from your mains(house panel) check line voltage, with digital volt meter, some compressor won't start if voltage drops to low, yes fan will work, could also be, your compressor has a lock rotor, (hard start), you can buy a compressor hard start kit, from appliance store, and try to start compressor, or maybe compressor internal winding, are damage, especially now in summer, when you got a lots of voltage drops, check compressor winding, check compressor winding for short circuit, remove cover on compressor, remove 3 wires from compressor terminal, use ohm meter, put one tester lead on copper tubing that's connected to compressor, and next lead to compressor terminal, one by one, if you get beep (continuity) from anyone of those compressor terminal, you got a short- circuit in compressor, you will have to replace compressor, but if there's no short, them try hard- start kit, replace overload relay, you will see it at compressor terminal location, after you remove cover. good luck.

Aug 10, 2009 | Heating & Cooling

1 Answer

Refridge hums then you hear a click,lights dim like the compressor turned on then another click a few seconds latter.this same cycle repeats .evaporator and compressar fans stay running.


it sounds like a bad: 
  •   start switch (on the side of the compressor) or
  •   compressor itself
  • the start switch clicks  off usually when the compressor is pulling too many amps or the compressor is overheating. if the compressor is not even running then its probably not overheating.
  • so either the compressor is pulling too many amps (bad compressor) or the start switch is bad and cannot handle the amps required to start the compressor.


Jul 02, 2008 | Refrigerators

1 Answer

Freezer has quit working and now refrigerator not cooling like it should.


If you hear the start relay clicking after the compressor tries to start then you know that there is power to the compressor.
This tells you it is ether a bad start relay or a bad compressor.
At this point I use a meter to see if the compressor is shorted to ground.
If the compressor is not shorted then replace the start relay and give it a try.
You should hear the compressor start right away with a new start relay if that was the problem.
If the compressor is shorted to ground you will need to have the compressor replaced.
Given the history on whirlpool refrigerators in the 5 year old age range It may be good chance that a new start relay will fix your refrigerator.
If the start relay is bad you will hear it try to start the compressor and then click off.
If the relay is bad you will hear the clicking sound seconds after plugging it in and then again every minute or two as it keeps trying to start the compressor.

Jun 02, 2008 | Whirlpool Refrigerators

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