Which of the following steps is not a step in the startup of a reciprocating or rotary compressor refrigerating system?

Which of the following steps is not a step in the startup of a reciprocating or rotary compressor refrigerating system?

a) Check oil level in the compressor, it should be at or above the centre of the sight glass.
b) Check the setting of high and low pressure cutout switches.
c) Open all shutoff valves in the system except bypass valves used elsewhere in the system.
d) Valves in lines connecting suction gages should be closed.
e) Check oil level in the compressor; it should be below the centre of the sight glass.







Answer: D

When a chiller has stopped due to low water temperature, and the chilled water temperature subsequently rises approximately 5-6°C above the chilled water temperature set point, the:

When a chiller has stopped due to low water temperature, and the chilled water temperature subsequently rises approximately 5-6°C above the chilled water temperature set point, the:

a. Compressor will restart
b. Compressor will require a manual reset
c. Cooling tower fan will restart
d. Cooling tower fan will shut down
e. Condenser pump will restart





Answer: A

To avoid liquid slugging in a direct expansion evaporator after shutting down a reciprocating or rotary compressor refrigerating system which of the following measures needs to be taken?

To avoid liquid slugging in a direct expansion evaporator after shutting down a reciprocating or rotary compressor refrigerating system which of the following measures needs to be taken?

a. Pump down the evaporator
b. Drain the liquid from the evaporator into the high-side
c. Discharge the condenser refrigerant into the evaporator
d. Open all the suction valves on the connecting condenser line
e. Fill the evaporator with refrigerant vapour







Answer: A

If a refrigeration compressor fails to start but the motor is running, which of the following could be a cause?

If a refrigeration compressor fails to start but the motor is running, which of the following could be a cause?

a. The control circuit is open
b. The compressor is seized
c. The coupling is sheared or broken
d. The motor is burned out
e. The starter is defective









Answer: C