Self-contained Units Flashcards
What device would be considered a non-modulating expansion device?
a capillary tube
A CPR valve is used to protect the compressor from?
B. high load pull-downs
C. amperage load over RLA
What happens to the gauges if there is a high refrigerant charge in a system using a capillary tube?
both the suction and discharge gauges will indicate a high pressure
An overcharge with this type of device will cause a decrease in evaporator superheat?
capillary tube
The liquid receiver service valve could be used to?
*A. charge refrigerant into the system
B. remove refrigerant for the system
C. stop the flow of refrigerant for system pump down purposes
*D. all of the above
A technician me need to bypass this control when charge a system
LPC
When charging liquid refrigerant into a compressor care must be taken because?
B. damage to the compressor may occur by liquid slugging
C. it is easier to overcharge the system
Low suction pressure and under cooling can be caused by?
undercharged system
What type of refrigerants must be charged into a system in a liquid form?
A. zeotropic refrigerants
B. near azetropic refrigerants
A low pressure switch can be used to?
control frost build-up on the coil
What device is used to shut the compressor off if the suction falls below a given set point?
LPC
What device is used to prevent refrigerant migration to the compressor during the off cycle?
A. a crankcase heater
C. a pump-down cycle
