10
up to 800 psig high-side and 250 psig low-side with a 550 psig low-side retard.
Hoses need to have a service pressure rating of 800 psig. Recovery cylinders need
to have a 400 psig service pressure rating.
DOT 4BA400 or DOT BW400.
Combustibility:
At pressures above 1 atmosphere, mixture of R-410A and air can
become combustible.
R-410A and air should never be mixed in tanks or supply
lines, or be allowed to accumulate in storage tanks. Leak checking should
never be done with a mixture of R-410A and air.
Leak checking can be per-
formed safely with nitrogen or a mixture of R-410A and nitrogen.
5.2 QUICK REFERENCE GUIDE FOR R-410A
• R-410A refrigerant operates at approximately 60% higher pressure (1.6 times)
than R-22. Ensure that servicing equipment is designed to operate with R-410A.
• R-410A refrigerant cylinders are pink in color.
• R-410A, as with other HFC’s is only compatible with POE oils.
• Vacuum pumps will not remove moisture from oil.
• R-410A systems are to be charged with liquid refrigerants. Prior to March 1999,
R-410A refrigerant cylinders had a dip tube. These cylinders should be kept
upright for equipment charging. Post March 1999 cylinders do not have a dip tube
and should be inverted to ensure liquid charging of the equipment.
• Do not install a suction line filter drier in the liquid line.
• A liquid line filter drier is standard on every unit. Only manufacturer approved liq-
uid line filter driers can be used. These are Sporlan (CW083S) and Alco
(80K083S) driers. These filter driers are rated for minimum working pressure of
600 psig.
• Desiccant (drying agent) must be compatible for POE oils and R-410A.
6.0 REPLACEMENT UNITS
To prevent failure of a new condensing unit, the existing evaporator tubing system
must be correctly sized and cleaned or replaced. Care must be exercised that the
expansion device is not plugged. For new and replacement units, liquid line filter
drier sould be installed and refrigerant tubing should be properly sized. Test the oil
for acid. If positive, a suction line filter drier is mandatory.
IMPORTANT:
WHEN REPLACING AN R-22 UNIT WITH AN R-410A UNIT,
EITHER REPLACE THE LINE SET OR ENSURE THAT THE EXISTING LINE SET
IS THOROUGHLY CLEANED OF ANY OLD OIL OR DEBRIS.
7.0 EVAPORATOR COIL
REFER TO EVAPORATOR COIL MANUFACTURER’S INSTALLATION
INSTRUCTIONS.
IMPORTANT:
The manufacturer is not responsible for the performance and opera-
tion of a mismatched system, or for a match listed with another manufacturer’s coil.
NOTE: All units must be installed with a TEV Evaporator.
The thermostat expansion valve is specifically designed to operate with R-410A.
DO NOT use an R-22 TEV or evaporator. The existing evaporator must be
replaced with the factory specified TEV evaporator specifically designed for
R-410A.
LOCATION
Do not install the indoor evaporator coil in the return duct system of a gas or oil fur-
nace. Provide a service inlet to the coil for inspection and cleaning. Keep the coil
pitched toward the drain connection.
!
CAUTION
Only use evaporators approved for use on R-410A systems. Use of existing R-22
evaporators can introduce mineral oil into the R-410A refrigerant forming two differ-
ent liquids and decreasing oil return to the compressor. This can result in com-
pressor vfailure.
