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How to tell if the compressor on your ac unit is running

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If you have a split unit, it is fairly simple, just feel the small refrigerant line coming out of the unit. The temperature should be warmer than the surrounding air. If is not running the temperature will be the same as the surrounding air. If you have a package unit, take off the access cover to where the compressor is located. Find the compressor discharge piping to the the condensing coil. It is the smaller of the two major pipes on the side of the compressor. Be careful the temperature of line coming out of a properly operating compressor will be hot enough to cause second degree burns. If the line is very warm to very hot the compressor is running. If you have a set of gauges, attach the RED hose to the high pressure service connection and the other low pressure hose BLUE to the bigger pipe low pressure connection. Make sure the gauges are isolated by shutting the valves. The pressure difference between high and low pressure is normally at least 150 psig diference.

Posted on Oct 14, 2014

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How can I tell whether my portable AC unit is low on freon gas or if the compressor is bad?
You can tell a compressor is running by measuring amp draw but you can check return air temp vs supply air temp. 15 degrees should be minimum temp split.

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2002 4 ton Bryant air conditioner shuts off, fan still runs but not cooling is problem in the controls in the attic or in the AC unit or both?
With a non heat pump it is a simple 24 volt AC control circuit. In the attic there is a relay that is actuated via the fan control wire directly from the thermostat. On the thermostat there is an auto/man switch that controls the fan. Manual the fan runs all the time. Auto fan turns on and off with the outside compressor.

If the system is not calling for cool and the fan continues to run the fan relay is sticking. common problem. Sometimes after running for several days the relay will stop sticking if not, replace relay.

If the system is calling for cool and the compressor stops I would still expect the fan to run until thermostat tells the A/C to off. Some compressor units include a safety switch or high-pressure cut-out switch A blocked internal valve bad control board or external fan in outside unit defective no air flow in outside unit.
High pressure cut out not good,

Suggest turning temp max cool and observe. If acceptable cool and the compressor runs without interruption all is good, except for the blower in the attic. Safely check relay in attic blower circuit.

Hope this helps.

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1 Answer

I have a 2011 starcraft autumn ridge 197FBH....the AC unit just stopped working out of the blue. now we cant get it to run again.does anyone know how many watts the AC uses? or any ideas we can try..
question is hazy as to what you want ill assume its not working check the breaker, fuses and relays to unit and power to compressor if you have power to compressor and still not running can assume compressor is done ---as to watts when you remove the cover to the unit the name plate will have all the information on it i couldnt tell you because units have all different options including different a/c systems

Jul 07, 2016 | RVs

1 Answer

At night its shuts down when the therm is satisfied,but trys to restart right away and when it does start it shuts down right away and just keeps doing this
The thermostat has a differential built into the temperature sensing operation. The differential is normally a degree or more. If the stat shuts down at 72 degrees it should not start the unit again until the temperature in the room reaches 73. If the AC runs and cools properly until it shuts down, I would check the thermostat. The AC can not restart immediately after it shuts off because the pressures in the system are too high at the compressor. It takes a few minutes for the pressures equalize allowing the compressor to start. If the stat tells the unit to start under high pressure, the compressor will shut down on overload. It will start and run after the pressure falls enough for the compressor motor to run.

Jun 04, 2015 | Dometic Rooftop RV Air Conditioner

1 Answer

I HAVE YORK SPLIT AC OF 1.5 TON AND I AM SEEING UTHE E4 ERROR IN IT AND AFTER THIS ERROR OUTDOOR STOP WORKING BUT INDOOR STILL RUNNING PLZZ TELL ME ABOUT THIS ERROR AND IT,S SOLUTION,
Hi Waleed,

Your system is going into safe protection mode.The compressor seems to draw a lot of current,so try to disconnect the compressor from the out door unit relay and try to run it again.Ensure that no naked cable is touching other parts.

If unit runs with out door fun only then compressor is faulty or there is some restriction in the gas system.

May 03, 2014 | Heating & Cooling

1 Answer

I have a 1999 ford expedition and my ac is not cold! I checked fuses and they all seem fine. The ac is blowing but its not cold! How can I tell if its the compressor? Could it just be the a/c clutch...
Hi Kaseyloe, I think that the first thing you should have inspected is the AC gas pressure. If its leaked out, the unit won't run. The clutch of the compressor won't activate. Best take it to a refrigeration company and have them check it for you.
Regards Johngee10

Jun 10, 2011 | 1999 Ford Expedition

1 Answer

I have a 2005 Buick Rainier. The A/C unit has a full charge but the compressor won't come on. The relay checked out ok, yet when jumped out the compressor works.
The ac system has to be reset,removal of the fuse for the ac,will do this,leave it out for about 10 seconds then replace it,removal of the negative battery cable will most likely do it,but,the computer for the vehicle might loose it`s memory if you do this,unless you have had the battery out before,and know that it will not,after reseting the ac system,have the ac gauges put on the car,and see what the readings will tell,there is a problem there somewhere or the ac system would not shut down,the system while not running,it is hard to tell if there is enough freon ,or not,but check it with the gauges to tell for sure what the problem is.

May 28, 2010 | 2005 Buick Rainier

1 Answer

Tell me is there any power consumption reduction when only single indoor unit is running on a multi split AC,ALSO TELL ME OTHER BENEFITS OF MULTI SPLIT ACS
No, no benefits at all Watts are Watts... Kilowatts Hours are Kilowatt Hours are all the same, sometimes however a differing Rate may be charged for differing connection, but usually no difference at all. Splitting a phase.

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1 Answer

AC/Heatpump units cycle numerous times blowing ambient air.
If the compressor never kicks in, I would check the start capacitor, thermostat and the compressor windings. Most times the start capacitor is defective. Some window air conditioners the fan will run while the compressor stop through the thermostat switch. If the thermostat switch is bad every thing runs except the compressor. Let me know, Thanks, Sea Breeze

Feb 07, 2009 | Dometic Rooftop RV Air Conditioner

2 Answers

Compressor on ac unit
It could be a relay for the compressor is sticking in the run position.
If it is only about one week old take it back to the dealer for service or call them and tell them your problem. This should be covered by warranty and the dealer can refer you to someone authorized to do the work.

Jul 08, 2008 | Dometic Rooftop RV Air Conditioner

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