Friedrich VERT-I-PAK VHA-18K75RTP, Service & Parts Manual

Page: 30 / 103

30 PB
R-410A SEALED SYSTEM REPAIR
WARNING
Refrigeration system under high pressure
O
service this equipment.
R410A systems operate at higher pressures than
R22 equipment. Appropriate safe service and
handling practicces must be used.
Only use gauge sets designed for use with R410A.
Do not use standard R22 gauge sets.
The following is a list of important considerations
when working with R-410A equipment
1.
R-410A pressure is approximately 60% higher than R-22
pressure.
2. R-410A cylinders must not be allowed to exceed 125 F, they
may leak or rupture.
3. R-410A must never be pressurized with a mixture of air, it
may become
flammable.
4. Servicing equipment and components must be specifically
designed for use with R-410A and dedicated to prevent
contamination.
5. Manifold sets must be equipped with gauges capable of
reading 750 psig (high side) and 200 psig (low side), with a
500-psig low-side retard.
6. Gauge hoses must have a minimum 750-psig service
pressure rating
7. Recovery cylinders must have a minimum service pressure
rating of 400 psig, (DOT 4BA400 and DOT BW400 approved
cylinders).
8. POE (Polyol-Ester) lubricants must be used with R-410A equipment.
9. To prevent moisture absorption and lubricant contamination, do not leave the refrigeration system open to the atmosphere
longer than 1 hour.
10. Weigh-in the refrigerant charge into the high side of the system.
11. Introduce liquid refrigerant charge into the high side of the system.
12. For low side pressure charging of R-410A, use a charging adaptor.
13. Use industry standard R-410A filter dryers.
IMPORTANT
SEALED SYSTEM REPAIRS TO COOL-ONLY MODELS REQUIRE THE INSTALLATION OF A LIQUID LINE DRIER.
EQUIPMENT REQUIRED:
1. Eletrical Multimeter
2. E.P.A. Approved Refrigerant Recovery System
3. Vacuum Pump (capable of 200 microns or less vacuum.)
4. Acetylene Welder
5. Electronic Halogen Leak Detector capable of detecting HFC (Hydrofluorocarbon) refrigerants.
6. R410A Refrigerant Manifold
7. 1/4” Braze-type Access Ports
8. Pinch Tool
9. Refrigerant Scale
10. Vacuum Gauge - (0 - 1000 microns)
11. Facilities for flowing nitrogen through refrigeration tubing during all brazing processes.
EQUIPMENT MUST BE CAPABLE OF:
1. Recovering refrigerant to EPA required levels.
2. Evacuation from both the high side and low side of the system simultaneously.
3. Introducing refrigerant charge into high side of the system.
4. Accurately weighing the refrigerant charge introduced into the system.
WARNING
EPA 608 Warning:
It is a violation of the environmental Protection Agency,
Claus608A, to service refrigeration systems without
proper certification