What causes some liquid refrigerant to return to a running compressor?
Floodback occurs when liquid refrigerant returns to the compressor during the running cycle. For instance, if the evaporator coil freezes over, if an evaporator fan fails, the liquid will not be properly evaporated. This liquid then returns to the compressor, and the result is severe damage or failure due to floodback.
What causes compressor flooding?
Flooding is what happens when liquid refrigerant enters the compressor’s crankcase while the compressor is running. Flooding occurs to a compressor only during the running cycle. Causes of flooding can include: Wrong TXV setting (no compressor superheat).
Can liquid refrigerant damage compressor?
Liquids cannot be compressed, which is why liquid refrigerant is one of the worst enemies of a compressor. The compressor is often referred to as the heart of the refrigeration system. Without the compressor, refrigerant could not reach other system components to perform its heat transfer functions.
Can a reciprocating compressor pump liquid?
Why can’t reciprocating compressors pump liquid? You cannot compress a liquid.
How to start a refrigerant compressor step by step?
1 Start the cooling medium to the condenser (fan or water). 2 Close the receiver liquid outlet valve. 3 Start the compressor to suck the lower pressure side of the refrigerant into the condenser. 4 The compressor stops automatically as the low pressure cut out switch gets activated (the set point at around 0.02Mpa).
When do liquid refrigerant problems become a problem?
When liquid refrigerant control becomes a problem, one or more of the following types of corrective action may be necessary. Minimum refrigerant charge: The best compressor protection against all forms of liquid refrigerant problems is to keep the charge within the compressor’s limits.
Can a liquid refrigerant be added to a compressor?
Liquid refrigerant charging Liquid refrigerants are normally added in the liquid line following proper conditions. If any heating method is used to inject vapour refrigerant into the suction line then 100% vapour must enter the compressor. Liquid refrigerants are incompressible and can cause severe damage to any compressor.
What does liquid refrigerant slugging in compressor mean?
Liquid refrigerant slugging: Liquid slugging is the term used to describe the passage of liquid refrigerant and oil through the compressor’s suction and discharge valves. It is evidenced by a loud metallic clatter inside the compressor, possibly accompanied by extreme vibration of the unit.
Liquid refrigerant charging Liquid refrigerants are normally added in the liquid line following proper conditions. If any heating method is used to inject vapour refrigerant into the suction line then 100% vapour must enter the compressor. Liquid refrigerants are incompressible and can cause severe damage to any compressor.
What happens when refrigerant enters the compression line?
Liquid entering the compressor through the suction line is a very serious problem. It can cause liquid slugging, which is what happens when liquid refrigerant enters the compression portion of the compressor. Liquid slugging will most likely cause damage to the compressor instantly. Another problem is bearing washout or “flooding.”
When does refrigerant migration occur in a compressor?
Refrigerant migration: Refrigerant migration is a term used to describe the accumulation of liquid refrigerant in the compressor during periods when the compressor is not operating. It can occur whenever the compressor becomes colder than the evaporator, since a pressure differential then exists to force refrigerant flow to the colder area.