Friedrich R410A manual Recommended procedure for compressor replacement, High Temperatures

COMPRESSOR REPLACEMENT

Recommended procedure for compressor replacement

WARNING

RISK OF ELECTRIC SHOCK

Unplug and/or disconnect all electrical power to the unit before performing inspections, maintenances or service.

Failure to do so could result in electric shock, serious injury or death.

1.Be certain to perform all necessary electrical and refrigeration tests to be sure the compressor is actually defective before replacing.

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.

2.Recover all refrigerant from the system though the process tubes. PROPER HANDLING OF

RECOVERED REFRIGERANT ACCORDING TO EPA REGULATIONS IS REQUIRED. Do not use gauge manifold for this purpose if there has been a burnout. You will contaminate your manifold and hoses. Use a Schrader valve adapter and copper tubing for burnout failures.

WARNING

HIGH TEMPERATURES

Extreme care, proper judgment and all safety procedures must be followed when testing, troubleshooting, handling or working around unit while in operation with high temperature components. Wear protective safety aids such as: gloves, clothing etc.

Failure to do so could result in serious burn injury.

NOTICE

FIRE HAZARD

The use of a torch requires extreme care and proper judgment. Follow all safety recommended precautions and protect surrounding areas with fi re proof materials. Have a fi re extinguisher readily available. Failure to follow this notice could result in moderate to serious property damage.

3.After all refrigerant has been recovered, disconnect suction and discharge lines from the compressor and remove compressor. Be certain to have both suction and discharge process tubes open to atmosphere.

4.Carefully pour a small amount of oil from the suction

stub of the defective compressor into a clean container.

5.Using an acid test kit (one shot or conventional kit), test the oil for acid content according to the instructions with the kit.

6.If any evidence of a burnout is found, no matter how slight, the system will need to be cleaned up following proper procedures.

7.Install the replacement compressor.

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 result in serious injury or death.

8.Pressurize with a combination of R-410A and nitrogen and leak test all connections with leak detector capable of detecting HFC (Hydrofl uorocarbon) refrigerant. Recover refrigerant/nitrogen mixture and repair any leaks found.

Repeat Step 8 to insure no more leaks are present.

9.Evacuate the system with a good vacuum pump capable of a fi nal 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.

CAUTION

FREEZE HAZARD

Proper safety procedures must be followed, and proper protective clothing must be worn when working with liquid refrigerant.

Failure to follow these procedures could result in minor to moderate injury.

10.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.

NOTE: NEVER, under any circumstances, liquid charge a rotary compressor through the LOW side. Doing so would cause permanent damage to the new compressor.

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