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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
Hermetic compressors shouldn’t be energized under vacuum because ________.
It may cause compressor burnout
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.
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.