Trane TR-OHS RCU Series Installation, Operation And Maintenance Manual page 27

Important: Damage to a replacement compressor
caused by improper system cleaning
constitutes abuse under the terms of the
warranty. This will void the compressor
warranty. Always consult the factory prior
to replacing the compressor.
If there is no acid in the oil, there has been a mechanical
failure. Refer to "Standard Cleanout Procedure," p. 27
the proper cleaning procedure.
NOTICE
Equipment Damage!
POE oil is used in systems with R407C refrigerant. If a
replacement compressor is provided, ensure that it is
filled with POE oil before installing.
Standard Cleanout Procedure
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Failure to disconnect power
before servicing could result in death or serious injury.
WARNING
Risk of Burns!
Avoid touching or contacting the gas and oil with
exposed skin. Severe burns will result. Use long rubber
gloves in handling contaminated parts.
Note: Cleaning operations must be performed by a
journeyman, refrigeration mechanic, or air
conditioning technician.
1. Turn off power to the unit at the main power
disconnect switch.
2. Remove the old compressor and install the new
compressor.
3. Remove the liquid line drier and install an oversized
liquid line filter-drier (one size larger than the normal
selection size).
4. Evacuate the system according to standard
procedures. Normally, this will include the use of a
high-vacuum pump and a low-vacuum micron gauge
for measuring the vacuum obtained.
5. Recharge the system.
6. Turn on the power at the main power disconnect
switch and start the system.
SS-SVX004C-EN
Burn-Out/Acidic Cleanup Procedure
Hazardous Voltage!
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
for
tagout procedures to ensure the power can not be
inadvertently energized. Failure to disconnect power
before servicing could result in death or serious injury.
Note: Cleaning operations must be performed by a
journeyman, refrigeration mechanic, or air
conditioning technician.
1. These systems should be cleaned using the suction
line filter-drier method.
2. Turn off power to the unit at the main power
disconnect switch.
3. Remove the burned-out compressor and install the
new compressor.
4. Install a suction line filter-drier designed for acid
removal.
5. Remove the liquid line drier and install an oversized
liquid line filter-drier (one size larger than the normal
selection size).
6. Check the expansion valve, sight glass and other
controls to see if cleaning or replacement is required.
7. Evacuate the system according to standard
procedures. Normally, this will include the use of a
high-vacuum pump and a low-vacuum micron gauge
for measuring the vacuum obtained.
8. Recharge the system through the access valve on the
suction line filter-drier.
9. Turn on power at the main power disconnect switch
and start the system.
10. The permanently installed suction line filter-drier
permits small-system cleanup to be completed in one
service call. The pressure drop across the suction line
filter-drier should be measured during the first hour of
operation. If the pressure drop becomes excessive, the
suction line filter-drier should be replaced (See
Sporlan Bulletin 40 - 10, for maximum recommended
pressure drop (PSI) for suction line filter drier).
11. In 24 hours, take an oil sample. Observe the color and
test for acidity. If the oil is dirty or acidic, replace the
suction line filter-drier.
12. In two weeks, examine oil to determine if another
suction line filter-drier change is necessary.
Maintenance
WARNING
27