Frequently Asked Questions
Q. What is R-410-A?
A. R-410-A is a mixture (blend) of refrigerants that create near identical properties
of R-22, but are free of ozone depleting chlorine molecules. (50% R-32 and 50% R-125)
Q. Why do we need it?
A. R-410-A was developed to replace the ozone depleting R-22 refrigerant now used in
most residential and some commercial air conditioning equipment. Phase out schedules for R-22 were established
at the 1987 Montreal Protocol and will begin in the year 2004 and continue through 2030.
Q. Will my existing unit work with 410-A?
A. The operating pressure of R-410-A is 50-70% higher than R-22. This requires
not only a specially designed compressor and metering device, but also thicker walls on refrigerant tubing for safety.
Therefore, R-410-A may only be used in equipment specifically designed for the new refrigerant.
Q. Does servicing a R-410-A unit differ from R-22?
A. The following service changes apply:
1. Special equipment such as gauge manifold sets and hoses and compatiable
leak detection and reclaimation equipment is required for the installation and service of R-410-A systems.
2. Vacuuming R-410-A systems and the installation of R-410-A specific driers
is critical to long term performance of the R-410-A equipment. The synthetic polyol ester oil (POE) is extremely hygroscopic
(absorbs water easily), and evacuation to 500 microns is essential.
3. Removal of any suction line filter is imperative after 72 hours of run time.
The POE will break down drier dessicants and the resulting sludge will permeate the system. Manufacturers will
eventually void warranties on returned compressors which contain such sludge.
4. Replacement of failed parts must be done with like components rated for higher
pressures (i.e. pressure control metering device.).
5. Pink is the industry designated color for R-410-A.
6. Comparable operating pressures for like results at a 90 degree ambient
are as follows
Low pressure cut out setting is 50PSI
High pressure cut out setting is 610PSI
Q. Who has R-410-A equipment?
Most manufacturers are on board with at least one line of R-410-A equipment.
For expert advise on equipment using the new refrigerant, call Mathes Mechanical Heating & Air
Mathes Mechanical Heating & Air
Baton Rouge, Louisiana
or e-mail this site