What is the substitute gas for R22?
R417A is one of the replacement for R22 as it has zero ODP and suitable for new equipment and as a drop-in replacement for existing systems. Some other refrigerants under consideration are R-407C (drop in substitute), R410-A (changing compressor as pressures are higher) and R-290 (Pure Propane). Source: The Comfort Environment Group Limited, Comfort Works, Newchapel Road, Lingfield, Surrey RH7 6LE (UK).