Compressor Replacement -Special Procedure In Case Of Compressor Burnout - Friedrich VERT-I-PAK VHA09K25RTQ Service Manual

R-410A SEALED SYSTEM REPAIRS

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, TXV, and filter drier from the system.
3. Flush evaporator condenser and all connecting tubing with dry nitrogen or
equivalent. Use approved 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, including new drier strainer and TXV.
5. Pressurize with trace amounts of R-410A and nitrogen to 550 psi and leak
test all connections with a leak detector. 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.
NOTE: 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.
9. Evacuate the system with a good vacuum pump capable of a final vacuum
of 300 microns or less. The system should be evacuated through both liquid
line and suction line gauge ports.
9a. Evacuate the system to 1500 microns.
9b. Repressurize to 50 PSI with nitrogen.
9c. Evacuate the system to 1000 microns.
9d. Repressurize to 50 PSI with nitrogen.
9e. Evacuate the system to below 500 microns.
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.