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Of the following conditions, when should the oil sample be taken from the refrigeration system?
When the compressor has burned out
Of the following conditions, when should the reciprocating compressor not be energized?
When the discharge service valve is close
What is a measuring unit of deep vacuum in a system?
The leak check should be done on heat pump that uses R-410A with _______
The compressor should be isolated before changing the compressor on a system containing R-410A. Then evacuate the compressor section to _______ and hold. If the system pressure does not rise, remove the compressor.
The primary water source most often used for cooling the condenser of a water-cooled recovery unit is _____.
local municipal water supply.
ASHRAE Standard 15 requires that the rooms with refrigerant systems must be equipped with sensors _______.
that sound an alarm and automatically starting a ventilation system with oxygen deprivation
System-dependent recovery equipment CANNOT be used when _____.
the appliance contains over 15 pounds of refrigerant.
The component directly following the evaporator of the refrigeration system is the ______________
What is the non-operating pressure inside a R-410 refrigerant system at room temperature 72 degrees F?
The R-12 refrigeration system which uses water cooled condenser should be charged first with vapor pressure of at least _______ before switching to liquid charging.