Ruud RP13, Installation Instructions Manual

11

INSTALLATION

Tools

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