Refrigeration course Flashcards
Compressor short cycling means that it is the frequent:
Abnormal starting and stopping
Which is the True statement when refrigerant is mixed with the oil in the refrigeration system:
It will remain unaffected by the entrained oil
The component that removes latent heat of vaporization superheat and heat of compression
Condenser
An increase of Suction pressure will
Restart the compressor automatically
Open ends of system under repair could cause excessive moisture if left exposed unprotected So therefore ends must be
Plugged
And oil separator separates or remove The oil from
Refrigerant vapor
To illuminate or prevent the possibility of icing of the TXV is the function of
Dehydrators
Compressor discharge line relief valve relieves Excessive pressure to
Compressor suction
Raising the internal pressure above atmospheric to Detect refrigerant leak is the method used on
Low pressure systems
Common sign of flood back or liquid refrigerant reaching the compressor
Sweating or frosting of the compressor crank case
And oil separator separates or remove the oil from
Refrigerant vapor
Elimination of refrigerant vapors in the liquid line Is done by
Sub cooling the liquid
To eliminate or prevent the possibility of icing of the TXV is the function of
Dehydrators
Refrigerating heat is the heat gained per pound of refrigerant in the
Evaporator
Compressor discharge line relief valve relieves excessive pressure to
Compressor suction
The sign of liquid refrigerant flood back to the compressor
Compressor oil forming
Refrigerant that carries moisture will
Freeze the TXV seat and starve the flow of refrigerant
In the event the TXV is stuck in the open position this will happen
Frost build up on the suction line of the compressor
Refrigerant and oil mixture will
Not be affected by the presence of oil
The low pressure switch will automatically restart the compressor when
Suction pressure increase
Compressor discharge relief valve returns the excess Pressure back to the
Compressor suction
Continuous operation of the compressor with box temperatures Remaining high is cause by
Low charge
Flood back means
Liquid refrigerant reaching the compressor
Abnormal system pressure buildup and the activation of high-pressure switch is likely caused by
Insufficient condenser water cooling supply
Ideal characteristics of oil well-suited for refrigeration use
Low pour point
Refrigeration oil must be
Low wax content
Refrigeration unit rated at 33K to 35k btu Per hour of cooling capacity has the equivalent what cooling capacity
3 tons
Effective way to check oil level
After prolonged period of operation and immediately after shut down
