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High discharge temperature keeps shutting compressor down

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Low on oil,cooler dirty,thermostat stuck..What kind is it?

Posted on Dec 18, 2010

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Posted on Jan 02, 2017

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Noma a/c cq120 makes noise in compressor area and casing is hot to touch. Is compressor going? Is it worth to repair or buy new. I'm guessing this unit is 4 years old or more


Possible Causes There are several reasons for a compressor to run too hot, including high compression ratio, high return gas temperatures, and lack of external cooling.High compression ratios are the result of either lower than normal suction pressures or higher than normal discharge pressures. Changes in suction pressure will affect the compression ratio more rapidly than changes in the discharge pressure. For this reason, it is important to keep the suction pressure at its highest possible value.
Causes of low suction pressure can include incorrect sizing of components, misadjusted or defective metering devices (TXVs), loss of refrigerant charge, plugged driers or strainers, and excessive suction line pressure drop.
Although not as sensitive to change as the suction pressure, the discharge pressure can still greatly affect the compression ratio. Keeping the discharge pressure within normal operating conditions is still important.
Causes of high discharge pressure can include dirty condensing coils, undersized discharge line, a blockage or recirculation of condenser air, erratic condenser fan operation, refrigerant overcharge, noncondensibles in the system, and an undersized condenser.
Many larger refrigeration systems with electronic controllers will automatically monitor the temperature of the discharge line and will send out an alarm to alert the owner or service contractor of a potential problem. Regardless of how the discharge line temperature is monitored, it should always be checked as part of any service to a refrigeration system.
A technician should also check the discharge line temperature within 6 inches from the outlet of the compressor. Any temperature above 225 degrees should be investigated and the cause found and repaired.

Jul 26, 2017 | Refrigerators

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

What problems can occur when you overcharge the hvac


The level of overcharge will dictate the severity of the possible problems. The most common problem with overcharging is creating high compressor head pressure which over-amps the compressor motor which waste energy and shortens compressor life. Installed high pressure safeties will usually shut off the unit off and must be manually reset. High system pressure also results in higher evaporator temperatures and higher air discharge temperatures. Grossly overcharged systems could return liquid to the compressor, destroying it.

Sep 04, 2014 | Heating & Cooling

1 Answer

Compressor problems


probably a bad discharge temp sensor or a bad thermo valve which is really a thermostat you need to take the temperature of the running unit when it is running best way is to use a inferred temp gun at the discharge of the pump or watch you temp guage if it jumps around or is erratic the sensor is bad .compressor usually will shut off on high temp at 230f

Mar 11, 2014 | Air Tools & Compressors

1 Answer

Ice machine harvest two times and shut off


These unit time freeze time and harvest times and keeps track of them. If your freeze time exceeds 35 minutes or harvest time exceeds 3 minutes, it will place unit in lockout. The biggest cause for excessive time to harvest is the harvest valve not functioning properly, and undercharged unit or a dirty condenser. The most probable cause is a dirty condenser. Under charged units can be determined by checking compressor outlet temperature while running, it should be 150 to 190 degrees depending on atmospheric conditions present. If it is harvest valve, the downstream temperature will stay at or near compressor discharge temperature. It should cool down to ambient temperature in a few minutes after freeze cycle begins.

Nov 25, 2013 | Scotsman Ice Maker 600LB CM3 30inW...

1 Answer

High temp discharge air


Try unhooking the sensor at the pump and sticking a paper clip into the plug terminals and see if it shuts down. If it doesn't then you have a bad sensor or it is overheating. Make sure it has plenty of oil in the system. Also check the scavenger line coming off of the air/oil separator to make sure it isn't plugged up.

Dec 09, 2012 | Ingersoll Air Tools & Compressors

3 Answers

I HAVE SHARP 12000 BTU WALL UNIT. IT STARTS FINE BUT SHUTS OFF AFTER RUNNING FOR COUPLE OF MINUTES.


Hi,
Many times this unit seems like it is running just fine, but in fact it has a problem...
Most have a freeze sensor that will shut down the unit if the evaporator coil gets too cold...
Now that problem can be caused by a couple of things...

A dirty filter or evaporator coil...
Low freon charge...in this case you have a leak somewhere in the refrigeration system...
Freeze sensor thermistor (probe) or circuit board are bad....
Fan motor not running full speed.....

These are the most common reasons why your A/C would run for a few minutes and then shut down...

heatman101

Jul 22, 2011 | Heating & Cooling

2 Answers

I have a 7-41 I.R. compressor. Recently serviced with 1200 hrs done. It now only runs for about 20 mins before shutting down. After 15 mins she starts again. I have tried bypassing water temp sender and...


make sure the cooler(s) are clean. Next check the airend discharge temperature switch commonly called a HAT (High Air Temp) switch. These switches will reset as the compressor cools down. I would be able to access the switch quickly. Run unit until shutdown remove wires and see if switch is open. if open you found your problem

Jun 01, 2011 | Ingersoll Air Tools & Compressors

2 Answers

1989 Ingersoll Rand 185 diesel compressor shuts down under load


most have safety shut downs built in, on the compressor side you will have a high discharge temp shut down, usually set to shut down @ 230 degrees F. normal temp should be @ 180F if it is running hot first check oil level on the compressor, and that the radiator is clean. some machines will have a thermostat that will only allow oil flow to go to the radiator after it comes up to about 150 degrees F. you really need to have a manual on the machine to see what other safety's it may have on the compressor and engine side as well.

Jan 08, 2010 | Air Tools & Compressors

5 Answers

40 hp ingersoll rand rotary screw air compressor keep shutting


I have a ingersoll compreesor that keeps shuting down on high discharg air temp

Nov 12, 2008 | Ingersoll Rand Stationary Air Cooled...

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