Why does compressor discharge temperature high?

Why does compressor discharge temperature high?

What causes high discharge temperature? High discharge temperature is the result of temperatures in the compressor head and cylinders becoming so hot that the oil loses its ability to lubricate properly. This causes rings, pistons and cylinders to wear resulting in blow by, leaking valves, and metal debris in the oil.

Why is the discharge line leaving the compressor hot?

The “Discharge Line” leaves the compressor and runs to the inlet of the condenser. Because the refrigerant was compressed, it is a hot high pressure vapor (as pressure goes up – temperature goes up).

What should compressor discharge temp be?

The compressor’s discharge temperature should be measured about 1 to 2 inches away from the compressor on the discharge line. This discharge temperature should never exceed 225°F. Carbonization and oil breakdown can occur if compressor discharge temperatures exceed 225°.

Where is the discharge temperature on a compressor?

The discharge temperature can be measured by placing an insulated thermistor or thermocouple on the discharge line about 3 to 4 in. from the compressor. (See Figure 1.) The discharge temperature is a measure of the superheated refrigerant’s vapor temperature.

What is discharge protection of compressor?

The compressor discharge temperature protection is triggered when the temperature sensor on the discharge tube of the compressor reads too high of a value. The cause of this can be a faulty sensor, a faulty board, or an actual fault in the refrigerant lines (i.e. blockage, kink, etc.).

Why is my discharge pressure so high?

One common cause of high discharge pressure is the cooling medium (air or water) flowing across the condenser: either there is not enough or the temperature of the cooling medium is too high. This is normally easy to identify with a simple visual inspection of the condenser.

How do I reduce the discharge temperature on my compressor?

Discharge temperature is greatly affected by the compression ratio, the larger the compression ratio, the higher the discharge temperature. Reducing the compression ratio can significantly reduce the discharge temperature, including increasing the suction pressure and reducing the discharge pressure.

What is the normal discharge temp?

Copeland compressors state that the discharge temperature should never be over 225 and an average discharge temperature should be around 180 to 200 degrees F. on a normally operating system. By adding this diagnostic measurement to your “arsenal” of diagnostics, you can really see what is going on with a system.

What is the discharge pressure of a compressor?

Discharge pressure (also called high side pressure or head pressure) is the pressure generated on the output side of a gas compressor in a refrigeration or air conditioning system.

What is discharge temperature error?

What is compressor discharge pressure?

Discharge pressure (also called high side pressure or head pressure) is the pressure generated on the output side of a gas compressor in a refrigeration or air conditioning system. An extremely high discharge pressure coupled with an extremely low suction pressure is an indicator of a refrigerant restriction.

What causes high discharge superheat?

Other causes of high Discharge Superheat are a kinked or restricted liquid line, a restricted filter drier, a restricted Accurator piston or Accurator strainer or an Electronic Expansion Valve (EEV) under feeding the evaporator. Restricted condenser air flow can also contribute to high Discharge Superheat.

What causes low discharge from a reciprocating compressor?

However, a weak and inefficient discharge from a reciprocating compressor could be a sign of valve failure. When the pressure appears inadequate, the valve passage may have been blocked. In some cases, low discharge pressure is usually accompanied by excessive suction pressure. 3. Overly High Discharge Temperature

How does the discharge temperature of a compressor affect reliability?

Compressor discharge temperature and pressure might have an impact on compressor reliability. For example, excessive discharge temperature might cause metal fatigue of the valves and thermal stress of the lubricant.

When to know if your reciprocating compressor has a problem?

You need to check the line temperatures on your latest chart if you suspect that your reciprocating compressor has a faulty valve. Here, determine if the temperature is in line with the expected arc for the month or if there has been a sudden spike or dip in the chart since the first time you suspected a valve problem. 2.

What should the discharge temperature of a gas be?

At temperatures above 300°F (149°C), eventual lube oil degradation is likely, and if oxygen is present, ignition is possible. Under no circumstances should the discharge temperature be allowed to exceed 350°F (177°C). Cooling the suction gas. Reducing the compression ratios per stage by adding more stages of compression.

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