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When charging an R-410a water chiller, you must first charge with vapor to a pressure of at least ______ before switching to liquid charging.
When using recovery equipment manufactured BEFORE November 15, 1993 you must evacuate a low pressure chiller to what level before making a major repair?
25 in of Hg
What is the rupture disk relief pressure in the low pressure refrigeration system?
To determine how much vapor to charge into an evacuated chiller, you should charge with vapor until _______.
the system pressure corresponds to a refrigerant saturation temperature of 36 F.
If a large vacuum pump is used during evacuation _______
The evacuation process will speed up
The primary water source for a recovery unit condensing coil is ____.
the local municipal water supply.
The primary purpose of a purge unit on a CFC-11 chiller is to _____.
remove noncondensables from the system.
The leaks in a refrigeration system that contains _______ refrigerant need not be repaired as per EPA.
Less than 50 pounds
If you leak test a low-pressure chiller with nitrogen in excess of 10 psig, you could cause the ______ to fail.
If non condensables are present in the operating refrigeration system, ___________
The discharge pressure increases
If you are using a recovery machine manufactured BEFORE November 15, 1993, you must evacuate any low-pressure appliance to ______ before making a major repair.
25 inches of Hg vacuum
When controlled hot water or heater blankets are not feasible to pressurize a low-pressure system, what can be used to increase the pressure?
The discharge from a rupture disc should be piped ________ for venting.
What should be the minimum capacity of R-410A refrigerant recovery tanks?