7
4.0 INSTALLATION
4.1 Tools and Refrigerant
4.1.1 Tools Required for
Installing and Servicing
R-410A Models
Tools
Manifold Sets:
– Up to 800 PSIG [5,516 kPa] High-Side
– Up to 250 PSIG [1,724 kPa] Low-Side
– 550 PSIG [3,792 kPa] Low-Side Retard
Manifold Hoses:
– Service Pressure Rating of 800 PSIG [5,516 kPa]
Recovery Cylinders:
– 400 PSIG [2,758 kPa] Pressure Rating
– Dept. of Transportation 4BA400 or BW400
Ambient and Tube
Thermometers
Crescent Wrench
Allen Wrench
Manifold
Gauge
Set
Brazing
Rods
Recovery
Cylinders
Torch
Reclaimer
Nitrogen
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.
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 equipment.
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 [1,548 kPa].
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 [5,516 kPa] high-side
and 250 psig [1,724 kPa] low-side with a 550 psig
[3,792 kPa] low-side retard Hoses need to have
a service pressure rating of 800 psig [5,516 kPa].
Recovery cylinders need to have a 400 psig [2,758
kPa] 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.
4.1.3 Quick-Reference Guide
for R-410A
4.1.2 Specifications of 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 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 should be used.
Filter driers must be rated for a minimum working
pressure of 600 psig [4,137 kPa]. 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.
