Prior to making non-major repairs (such as replacing a main liquid line dehydrator dessicant cartridge) of a large, multi-box refrigeration system, what should be done before opening the system?

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Accepted Answer

pump down the low side and liquid line to 0 psig by closing the king valve, then isolate the dehydrator

Answer

recover the entire refrigerant charge to a suitable recovery cylinder, then isolate the dehydrator

Answer

pump down the low side and liquid line to the deepest achievable vacuum by closing the king valve, then isolate the dehydrator

Answer

isolate the dehydrator then release the remaining refrigerant in the dehydrator to the atmosphere

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