DIY project. Adding a small can of refrigerant R22 into a stationary A/C system. This is a commercial style self-contained package unit, but its essentially the same with every unit. The valve should be attached to the can first, screwed all the way in, then cracked a bit to clear the hose of air. connect to low-side port. DO NOT attach to high side. If you do, the can might burst. Charge upright, so that the liquid doesn't go in to slug the compressor. If liquid R22 is fed into the compressor and the piston tries to compress liquid, you might wreck it. It will take five minutes or more a can and the can will start to get cold as the refrigerant evaporates out of the can and into the system. Feel free to use a hot water bath. Use a heat blanket, or a bath of hot water to help the charging process. To replace the can, re-tighten then valve, unscrew the valve assembly from the can, then remove the bracket. (DO NOT loosen the valve, or you'll vent the charge from system into the air Attach bracket to can, tighten down the valve assembly into the can and loosen valve to continue charging. The can is empty when it is nearly as warm as the heating bath.
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