10
INSTALLATION
Tools and Refrigerant
Tools Required for Installing
and 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
CAUTION:
R-410A systems operate
at higher pressures than R-22 systems� Do not
use R-22 service equipment or components on
R-410A equipment�
Specifications 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 heat pumps�
Physical Properties:
R-410A has an atmospheric
boiling point of -62.9°F [-52.7°C] and its saturation
pressure at 77°F [25°C] is 224.5 psig.
Composition:
R-410A is a near-azeotropic
mixture of 50% by weight difluoromethane (HFC-
32) and 50% by weight pentafluoroethane (HFC-
125)�
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 must 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, a 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�
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 light rose in
color�
• R-410A, as with other HFCs, is only compatible
with POE oils�
• Vacuum pumps will not remove moisture from
POE oil used in R-410A systems�
• 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 factory-approved biflow liquid line filter drier
is shipped with every unit and must be installed
in the liquid line at the time of installation� Only
manufacturer-approved liquid 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� The filter
drier will only have adequate moisture-holding
capacity if the system is properly evacuated�
• Desiccant (drying agent) must be compatible for
POE oils and R-410A refrigerant�
Ambient and Tube
Thermometers
Manifold
Gauge
Set
Brazing
Rods
Torch
Nitrogen
Reclaimer
Recovery
Cylinders
Allen Wrench
Crescent Wrench
Tools
