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°. … High condensing temperature.
What does high discharge temperature mean?
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.
What is discharge temperature of chiller?
The discharge pressure varies according to the kind of refrigerant and application. For a 0°C saturation it can be as low as 7 bar on R134a, or as high as 30 bar on R410a. The discharge temperature is usually around 60°C to 80°C which is recorded on our detailed Tick Sheet during the maintenance.
Where is the discharge temperature located?
compressor The discharge line exiting the compressor is the hottest part of a refrigeration or air conditioning system. The compressor’s discharge line temperature can be measured by placing an insulated thermistor on the discharge line about 3 inches from the compressor.
What causes high liquid line temperature?
High compression ratios from the low evaporator pressure will cause high heat of compressions, thus high discharge temperatures. High superheats. Both evaporator and compressor superheats will be high. This is caused by the TXV, evaporator, and compressor being starved of refrigerant from the liquid line restriction.
How do I know my discharge is superheat?
The discharge superheat is calculated the same way as any other superheat/ subcool on a system. By measuring the discharge superheat you can subtract the suction superheat and that then leaves you with a figure of how much superheat the compressor has given through compression and mechanical /electrical inefficiencies.
How do you fix high temperature discharge?
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 would cause high discharge pressure?
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.
Is discharge high or low side?
The high side, or discharge line, will be the line connected to the compressor from the bottom or lower position. It will not be wrapped in insulation and will be warm to the touch. This is where freon exits the compressor as a liquid.
How hot should my AC compressor get?
For the health of the air compressor, the temperature at the discharge line should never exceed 225 degrees Fahrenheit. Anything hotter at the discharge line would put the discharge port dangerously above the 300 degrees Fahrenheit level.
What is discharge temperature compressor?
The compressor discharge temperature reflects the latent heat absorbed in the evaporator, evaporator superheat, suction line superheat, heat of compression, and compressor motor-generated heat. All of this heat is accumulated at the compressor discharge and must be removed.
What is discharge line in HVAC?
Discharge gas lines (often referred to as hot gas lines) allow refrigerant to flow from the discharge of the compressor to the inlet of the condenser. … Over sizing discharge lines increases the initial cost of the project and may result in insufficient refrigerant gas velocity to carry oil back to the compressor.
What is normal discharge superheat?
If you have come across a unit that has locked out on a Discharge Superheat fault, it is a good starting point to know what the ideal Discharge Superheat at standard cooling operating conditions should be (15-25K).
What is discharge temperature sensor?
The Discharge Air Temperature sensor is used to measure the temperature of the air that is emitted from the air ducts. … The control module calculates the temperature delta and automatically adjusts the HVAC system to minimize this temperature difference.
What does discharge temp sensor mean?
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.).
What is discharge superheat?
Answer #1: Discharge Superheat = Temperature of discharge line 6” downstream of the compressor discharge service valve (semi-hermetic) or discharge connection (hermetic) – saturated temperature of the liquid line (obtained from P/T conversion of liquid line pressure).
When flushing your system what should you do?
When flushing a system: Use only the appropriate refrigerant, proper recovery equipment, component parts, tools and lubricants. Do not inject the solvent into the compressor itself. In fact, the compressor should be removed or bypassed.
How do you check liquid restrictions?
What is saturated discharge temperature?
the saturation temperature of the refrigerant (the temperature at which the refrigerant changes from a liquid state to vapor. This is the same as its boiling point. For water at sea level, the saturation temperature is 212F. The saturation temperature of a liquid increases as pressure increases.
What would happen to the discharge line temperature with a decrease in suction line temperature?
A high head or low suction pressure can cause a higher discharge line temp. … That is simply because the suction temperature is lower, but a low suction temperature is still less important to compressor cooling than a proper mass flow rate.
What is low discharge superheat?
A low discharge superheat alarm indicates that the compressor is flooding with the refrigerant. This is mostly because the expansion valve is overfeeding to the evaporator or due to a faulty actuator.
What causes high evaporator approach?
High approach temperatures should be investigated as they are usually an indication of a severe problem: Fouled/Contaminated tubes (biofilm, scale, sludge, corrosion, etc.) Non-condensable gases present (Air in the refrigerant) Low refrigerant charge or altogether loss of charge.
What is IPM malfunction?
There are several causes for a malfunction of the inverter module (IPM) on a Bryant/Midea ductless mini split, including: Valves Closed (double check all of them) Restriction to flow (cap left on or kink in the line) Shortage of charge. Wiring mistake.
How do I lower my condenser temperature?
Reducing cooling water temperatures is a sure-fire way to improve condenser performance: A decrease in cooling water temperature of 10 degrees F can improve the overall heat rate of a power plant by 1%.
Will low refrigerant cause high pressure?
Condenser subcooling is a good indicator of how much refrigerant charge is in the system because low condenser subcooling can mean a low charge. … The excess refrigerant will accumulate in the condenser, causing high subcooling and high head pressures.
What is refrigerant discharging?
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.
Should AC lines be hot?
When the system is operating, the large insulated suction line should be cold to the touch and sweating at any point where there is no insulation. The smaller uninsulated liquid line should be warm to the touch after the system has been operating for 10 or 15 minutes.
What is the temperature drop for a conventional system?
The outlet air temperature in cooling will be colder than a conventional system. Normally on a conventional you will have 15 to 18° drop across the coil, on a Unico you will have 22 to 28° temperature drop.
Graduated from ENSAT (national agronomic school of Toulouse) in plant sciences in 2018, I pursued a CIFRE doctorate under contract with Sun’Agri and INRAE in Avignon between 2019 and 2022. My thesis aimed to study dynamic agrivoltaic systems, in my case in arboriculture. I love to write and share science related Stuff Here on my Website. I am currently continuing at Sun’Agri as an R&D engineer.