24. A new split system should be checked for leaks by;

pressurizing the system with a few ounces of HCFC-22 and compressed air.
pressurizing the system with a few ounces of CFC-12 and an inert gas.
releasing the factory refrigerant charge in the condensing unit.
pressurizing the system with a few ounces of system refrigerant and an inert gas.

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