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Causes for high compressor discharge temperature

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Good day,
If it's an R134A system, it could well be a restriction internally in the refrigeration system.

That's based on the assumption that the condenser cooling motor is running and running at speed,
the condenser coils are clean and the backing cover is in place since that ducts the air thru the condenser properly.

Last possibility is the system was overcharged.

Posted on Oct 12, 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

My Air compressor Dich. temp shows high temp....what are the reasons for the same.....


High temperature discharge air is caused by leaking reed valves or leaking head gaskets. Another indication of leaking head parts is that it takes longer to fill than usual or the compressor will not reach cut-out pressure. Good luck

Dec 06, 2014 | Air Tools & Compressors

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.

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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

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1 Answer

High discharge temperature keeps shutting compressor down


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

Nov 10, 2010 | Ingersoll Air Tools & Compressors

1 Answer

Hot air comes out at all times even when i turn on a/c


I think your cooling fan (elecric) isn't working when the a/c is on. If so, The a/c pressure climbs very high and pops open the emergency pressure release to save the system from damage.

Check your cooling fan and relays, or ect, engine collant temp sensor.

You may have to add freon too.

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A/C Pressure Cutoff Switch

The A/C pressure cutoff switch is used to interrupt A/C compressor operation in the event of high system discharge pressures.
  • The A/C pressure cutoff switch is mounted on a Schrader valve-type fitting on the A/C compressor to condenser discharge line.
  • It is not necessary to discharge the refrigerant system to remove the A/C pressure cutoff switch.
  • A valve depressor, located inside the threaded end of the A/C pressure cutoff switch, presses on the Schrader valve stem.
  • This allows the A/C pressure cutoff switch to monitor the compressor discharge pressure.
  • When the compressor discharge pressure rises, the switch contacts open, disengaging the A/C compressor. When the pressure drops, the contacts close to allow operation of the A/C compressor. For specifications regarding operating pressure(s), refer to Section 412-00 .
The switch contains a second set of electrical contacts used for high-speed cooling fan control.
  • When the compressor discharge pressure rises, the contacts close and engage the high-speed fan control. When the pressure drops, the contacts open and the high speed fan control is disengaged. For additional information, refer to Section 303-03 .

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1 Answer

A c starts off cooling good then compressor starts kicking in and


Several possible causes. Knowing the state of refrigerant charge would be helpful. Assuming it has a 'full' charge (full charge 680 Grams = 1.50 Pounds) Most common causes of AC problems:
1. Thermostatic switch (sensor) malfunction in the evaporator - allowing the evaporator to ice up. Check the vent temperature (using a cooking thermometer) to see if the temperature gets near or below freezing (32 Deg F.). If so, the thermostatic switch in the evaporator is defective. Replace it.
2. Refrigerant UNDER-charge. If the temperature does NOT get near freezing, then you need a set of AC gauges to check the compressor head pressure (High side) and the suction (Low side). High side pressure (nominal) is 229 PSI (+ - 20 psi) @ 2000 RPM. Low side (nominal) is around 20 to 40 psi. NOT common problems:
1. The magnetic clutch coil on the compressor... as it heats/warms up, the coil windings could be going 'open" circuit which would turn the compressor 'off.'
2. Compressor inefficiency (worn out).
3. Expansion Valve
4. Clogged Condensor

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1 Answer

Heat pump discharge over temperature


have you changed out the filter on the inside unit lately? remember that is the condenser in the heating mode.

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40 hp ingersoll rand rotary screw air compressor keep shutting


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

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