Replace The Reversing Valve - Friedrich Kuhl KCS12B10A Service Manual

Replace The Reversing Valve

WARNING
HIGH PRESSURE HAZARD
Sealed Refrigeration System contains refrigerant
and oil under high pressure.
Proper safety procedures must be followed,
and PPE must be utilized
when working with refrigerants.
Failure to follow these procedures could
result in serious injury or death.
1. Recover all refrigerant from the system though the process tubes. Refer to
PROPER HANDLING OF RECOVERED REFRIGERANT ACCORDING TO EPA REGULATIONS IS REQUIRED.
2. Remove solenoid coil from reversing valve. If coil is to be reused, protect from heat while changing valve.
NOTE: When brazing a reversing valve into the system, it is of extreme importance that the temperature of the valve does not exceed 250°F at any
time.
Wrap the reversing valve with a large rag saturated with water. "Re-wet" the rag and thoroughly cool the valve after each brazing operation of the four
joints involved.
The wet rag around the reversing valve will eliminate conduction of heat to the valve body when brazing the line connection.
3. Cut all lines from reversing valve.
4. Clean all excess braze from all tubing so that they will slip into fittings on new valve.
5. Remove solenoid coil from new valve.
6. Protect new valve body from heat while brazing with plastic heat sink (Thermo Trap) or wrap valve body with wet rag.
7. Fit all lines into new valve and braze lines into new valve.
8. Braze all connections. Refer to the
9. Pressurize with nitrogen to 550 psi and leak test all connections with a leak detection fluid. Repair any leaks found.
10. Once the sealed system is leak free, install solenoid coil on new valve.
11. Charge system with proper amount of refrigerant per the model nameplate. Refer to the
86
R-32 SEALED SYSTEM REPAIR
The use of a torch requires extreme care and proper
judgment. Follow all safety recommended precautions and
notice could result in moderate to serious property damage.
Refer to the Brazing section of this manua
Brazing section of this manual.
WARNING
EXPLOSION HAZARD
The use of nitrogen requires a pressure
regulator. Follow all safety procedures and
wear protective safety clothing etc.
Failure to follow proper safety procedures
could result in serious injury or death.
NOTICE
FIRE HAZARD
Refrigerant Removal, Recovery, and Evacuation
l.
refrigerant charging section of this manual.
Section of this manual).