Rheem RSNM SERIES, Installation Instructions Manual

Page: 7 / 44

7
A. GENERAL
The Packaged Air Conditioner is available without heat or with 5, 7, 10, 15, or 20 kW
electric heat. Cooling capacities of 2, 2
1 ⁄
2
, 3, 3 1 ⁄
2
, 4 and 5 nominal tons of cooling are
available.
The units are weatherized for mounting outside of the building.
The information on the rating plate is in compliance with the FTC and DOE rating for sin-
gle phase units.
B. MAJOR COMPONENTS
The unit includes a hermetically-sealed refrigerating system (consisting of a compressor,
condenser coil, evaporator coil with refrigerant metering device), a circulation air blower,
a condenser fan, and all necessary internal electrical wiring. The cooling system of these
units is factory-evacuated, charged 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 pres-
sure 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 ser-
vice 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. DO
NOT use an R-22 TXV. The existing evaporator must be replaced with the factory
specified TXV evaporator specifically designed for 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
!
WARNING
THE MANUFACTURER’S WARRAN-
TY DOES NOT COVER ANY DAM-
AGE OR DEFECT TO THE AIR CON-
DITIONER
CAUSED BY THE
ATTACHMENT OR USE OF ANY
COMPONENTS, ACCESSORIES OR
DEVICES (OTHER THAN THOSE
AUTHORIZED BY THE MANUFAC-
TURER) INTO, ONTO OR IN CON-
JUNCTION WITH THE AIR CONDI-
TIONER. YOU SHOULD BE AWARE
THAT THE USE OF UNAUTHO-
RIZED COMPONENTS, ACCES-
SORIES
OR DEVICES MAY
ADVERSELY AFFECT THE OPERA-
TION OF THE AIR CONDITIONER
AND MAY ALSO ENDANGER LIFE
AND PROPERTY. THE MANUFAC-
TURER DISCLAIMS ANY RESPON-
SIBILITY FOR SUCH LOSS OR
INJURY RESULTING FROM THE
USE OF SUCH UNAUTHORIZED
COMPONENTS, ACCESSORIES OR
DEVICES.