Compressor Replacement -Special Procedure In Case Of Compressor Burnout - Friedrich VRP12K Service And Parts Manual

R-410A SEALED SYSTEM REPAIR

Compressor Replacement -Special Procedure in Case of Compressor Burnout

WARNING
HIGH PRESSURE HAZARD
Sealed Refrigeration System contains refrigerant
and oil under high pressure.
Proper safety procedures must be followed,
and proper protective clothing must be worn
when working with refrigerants.
Failure to follow these procedures could
result in serious injury or death.
WARNING
ELECTRIC SHOCK HAZARD
Turn off electric power before service or
installation. Extreme care must be used, if it
becomes necessary to work on equipment with
power applied.
Failure to do so could result in serious injury or
death.
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.
WARNING
NEVER, under any circumstances,
liquid charge a rotary-compressor
through the LOW side. Doing so
would cause permanent damage to
the new compressor. Use a charging
adapter.
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1. Recover all refrigerant and oil from the system.
2. Remove compressor,and EEV.
3. Flush evaporator, condenser and all connecting tubing with dry
nitrogen or equivalent. Use standard flushing agent to remove all
contamination from system. Inspect suction and discharge line for carbon
deposits. Remove and clean if necessary. Ensure all acid is neutralized.
4. Reassemble the system.
5. Pressurize with a combination of R‑410A and nitrogen and leak test all
connections. If a leak cannot be found, pressurize with a combination of
Nitrogen and a trace charge of R‑410A and sweep with with an electronic
or Halide leak detector. Recover refrigerant and repair any leaks found.
5a. If leak detector is unavailable remove all refrigerant from system and
pressurize with nitrogen to 550 psi. Check that system holds pressure.
Repeat Step 5 to insure no more leaks are present
6. Evacuate the system with a good vacuum pump capable of a final
vacuum of 200 microns or less. The system should be evacuated through
both liquid line and suction line gauge ports. While the unit is being
evacuated, seal all openings on the defective compressor. Compressor
manufacturers will void warranties on units received not properly sealed.
Do not distort the manufacturers tube connections.
7. Recharge the system with the correct amount of refrigerant. The
proper refrigerant charge will be found on the unit rating plate. The use
of an accurate measuring device, such as a charging cylinder, electronic
scales or similar device is necessary.