51
FORM 145.18-IOM1
ISSUE DATE: 8/30/2018
R-410A QUICK REFERENCE GUIDE
See Section 1 - Installation for specific installation re-
quirements.
• R-410A refrigerant operates at 50–70% higher
pressures than R-22 refrigerant. Ensure that ser-
vicing equipment and replacement components
are designed to operate with R-410A refrigerant.
• R-410A refrigerant cylinders are rose colored.
• Recovery cylinder service pressure rating must be
400 psig (DOT 4BA400 or DOT BW400).
• Recovery equipment must be rated for R-410A
refrigerant.
• Do not use R-410A service equipment on R-22
systems. All hoses, gauges, recovery cylinders,
charging cylinders, and recovery equipment must
be dedicated for use on R-410A systems only.
• Manifold sets must be at least 700 psig high side
and 180 psig low side with a 550 psig retard.
• All hoses must have a service pressure rating of
800 psig.
• Leak detectors, must be designed to detect HFC
refrigerants.
• Systems must be charged with refrigerant. Use a
commercial type metering device in the manifold
hose.
• R-410A refrigerant can only be used with polyes-
ter (POE) type oils.
• POE type oils rapidly absorb moisture from the
atmosphere.
• Vacuum pumps cannot remove moisture from
POE type oils.
• Do not use liquid line driers with a working pres-
sure rating less than 600 psig.
• Do not install suction line driers in the liquid line.
• A liquid line drier is required on every unit.
• Do not use an R-22 TXV. If a TXV is necessary, it
must be an R-410A TXV.
• Never open the system to atmosphere when under
vacuum.
• If the system must be opened for service, evacuate
the system, then break the vacuum with dry nitro-
gen and replace the lter driers.
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