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To pump down an AC unit, start the system in cooling mode, remove valve caps, and close the liquid (small) line service valve completely using a wrench. Monitor gauges, and when pressure drops to near zero, close the suction (large) valve and immediately shut off power to avoid damage. This traps refrigerant in the condenser Do not run the compressor too long in a vacuum (below 0 PSI), as this can damage the compressor. For heat pumps, ensure the system is in cooling mode to prevent the reversin

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