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B. MAJOR COMPONENTS
The unit includes a hermetically-sealed refrigerating system (consisting of a scroll
compressor, condenser coil, evaporator coil with thermostatic expansion valve), a cir-
culation air blower, a condenser fan, and all necessary internal electrical wiring. The
cooling system of these units is factory-evacuated, charged with R-410A refrigerant
and performance tested. Refrigerant amount and type are indicated on rating plate.
C. R-410A REFRIGERANT
All units are factory charged with R-410A refrigerant.
1. Specification of R-410A:
Application: R-410A is not a drop-in replacement for R-22; equipment designs
must accommodate its higher pressures. It cannot be retrofitted into R-22 units.
pressure: The pressure of R-410A is approximately 60% (1.6 times) greater than
R-22. Recovery and recycle equipment, pumps, hoses and the like need to have
design pressure ratings appropriate for R-410A. Manifold sets need to range 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 performed safely
with nitrogen or a mixture of R-410A and nitrogen.
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.
• R-410A, as with other HFC's is only compatible with POE oils.
• Vacuum pumps will not remove moisture from POE 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.
• Desiccant (drying agent) must be compatible for POE oils and R-410A
3. Evaporator Coil / TXV
The thermostatic expansion valve is specifically designed to operate with R-410A.
4. Tools Required For Installing & Servicing R-410A Models
Manifold Sets:
-Up to 800 PSIG High side
-Up to 250 PSIG Low Side
-550 PSIG Low Side Retard
Manifold Hoses:
-Service Pressure Rating of 800 PSIG
Recovery Cylinders:
-400 PSIG Pressure Rating
-Dept. of Transportation 4BA400 or BW400
sCAUTION
R-410A systems operate at higher pressures than R-22 systems. Do not use R-22
service equipment or components on R-410A equipment.
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