The EPA requires that all commercial and industrial and commercial process refrigeration systems with more than 50lb of refrigerant be repaired when the annual leak rate exceeds ________

When evacuating a system, it is required that the vacuum pump pull a minimum of ______ :

As per the ASHRAE standard 15, a sensor and alarm are required for A 1 refrigerants to sense ______ depletion:

If a leak in an appliance makes the prescribed evacuation level unattainable, the appliance can be evacuated to _______:

(TXV) or an electronic expansion valve (EXV)  attempts to maintain a preset which of the following:

The refrigerant leaves the compressor as which of the following and enters the condenser

In which of the following type of compressor, incoming refrigerant is plumbed directly to the compressor inlet and the discharge refrigerant is used to cool the motor windings before leaving the compressor

The purpose of oil in the compressor is to keep:

The crankcase heater can also assist in refrigerant recovery