I'm thinking about purchasing a small portable recovery machine. Would like it capable of 80% shutoff and oil recovery separation. This will be mainly for my own personal use and only R134a recovery. I know there are small units that have the auto shut off at 80% capacity but do any have the oil separation capability? Looking for suggestions on what MFG and Model I should look at and any other suggestions. I already have the manifold gages , vacuum pump, digital weigh scale to 220 lbs (.25 oz increments), 2 oz oil/dye injector, Schrader valve removal tool (capable of removal without opening the system), O-ring kit, flush kit, EPA 608 & 609 Certification. Would also like any info on dry nitrogen tanks and setups.
The small portables are recovery only. The oil separation process is the "recycle" in the bigger recovery and recycle machines.
We use nitrogen tanks from our local welding gas vendor. You will need a tank regulator to reduce the tank pressure. Tip: an oxygen regulator is a lot cheaper than a nitrogen regulator.
DO NOT use oxygen for pressure testing. Oxygen plus oil under pressure is likely to explode. I think what HECAT was saying was to buy a new oxygen regulator and change the inlet fitting on it so it fits a nitrogen bottle.
Some people test at up to 200 psi, but some evaporators might blow out above 150 psi. In normal operation, the pressure on the low side is never much above 150.
The nitrogen tanks I rent/buy come with a 2500 PSI charge. The bottled gas regulator I use has 2 gauges included, and fits the nitrogen tank without the need for any adapters. We have this reg set at 100 PSI.
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