I have manifold with gauges & R22 refrigerant. Need diagram showing hookup?
It is against the law to refill unit without a EPA license and without searching for and repairing the leak. Once cannot buy most R22 without a license.
If you don't know what your doing then leave it alone. you could get hurt badly if you hook something up wrong. if the unit is not working then there has to be a vacuum pulled on the unit then you would be ready to install R22. if you overcharge the unit it will damage the compressor and that is not cheap to fix.
Some HVAC 'experts' install coil lines without a pressure outlet. (ecspecially older units) In which case, you will have to install one. Usually they are located outside very close to the compressor unit on the inflow copper line. If not present, you can chase the lines back to the cooler head in the furnace/cooling unit plenum. It would be visible at some point in the lines if it was installed in the first place.
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