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13.4.15
Perform a system leak check (refer to Test and Fault Isolation, Section 3, System Leak Check, Section 3.3)
Component Maintenance Manual
12037 N Highway 99
Seminole, OK 74868
Phone (405) 382-0731
Fax (405) 382-0737
http://www.enviro-ok.com
EFFECTIVITY: ALL 21-00-09
Page 14005
FEBRUARY 16, 2010
13.4.16
Perform system refrigerant charge (refer to Servicing, Section 13)
13.4.17
Verify system performance (refer to Test and Fault Isolation, Section 3.1)
Component Maintenance Manual
12037 N Highway 99
Seminole, OK 74868
Phone (405) 382-0731
Fax (405) 382-0737
http://www.enviro-ok.com
EFFECTIVITY: ALL 21-00-09
Page 15001
FEBRUARY 16, 2010
STORAGE
TASK 21-00-09-55-801
14.0
COMPRESSOR DRIVE MODULE ASSEMBLY STORAGE PROCEDURES
SUBTASK 21-00-09-99F-017
14.1
General:
14.1.1
This section defines the procedures and requirements necessary if the Compressor assembly is to be stored and not installed onto aircraft immediately. In addition, this section defines the procedures and requirements for operation on the aircraft during the cold winter months when the system is not typically needed or used. These requirements are needed to maintain a thin film of oil on the Compressor shaft dynamic seal to prevent leakage.
NOTE: If ambient temperature is below 50° F (10°C) the pressure switch is designed to keep the system from operating and causing possible damage if operated for extended periods of time. In this case, it is recommended that the aircraft be heated above this threshold to enable the system to operate.
CAUTION: OPERATION OF THE SYSTEM AT LOW AMBIENT TEMPERATURES FOR MORE THAN 15 MINUTES COULD RESULT IN MAJOR DAMAGE OF THE R-134A COMPRESSOR.
SUBTASK 21-00-09-55-001
14.2
System Long Term Shelf Storage:
14.2.1
If unit will be stored for periods in excess of 12 months, the following preventive maintenance should be followed for the compressor. These procedures should be performed at 12 months from MFG date on unit and every 6 months thereafter for a maximum of 36 months.
NOTE: When installing unit with MFG date in excess of 12 months prior to installation date, verify record of preventive maintenance. If no maintenance record exists, contact Enviro Systems Inc. prior to installation.
14.2.2
For internal pressures within a range of 5-15 PSIG, rotate compressor by hand through a minimum of 10 revolutions.
14.2.3
For internal pressures below 5 PSIG, system should be pressurized to 15 PSIG using regulated dry Nitrogen. After pressurizing the system, rotate the compressor by hand through a minimum of 10 revolutions.
14.2.4
If the system does not have any detectable pressure, the compressor oil must be checked for contamination using the following procedures:
Component Maintenance Manual
12037 N Highway 99
Seminole, OK 74868
Phone (405) 382-0731
Fax (405) 382-0737
http://www.enviro-ok.com
EFFECTIVITY: ALL 21-00-09
Page 15002
FEBRUARY 16, 2010
14.2.4.1
Remove compressor oil plug and insert a clean tie strap into oil fill hole. Remove the strap to inspect the oil. Oil should have a clear to amber color. If oil shows specs of black or other contamination, compressor oil should be drained and replaced.
14.2.4.2
Drain old oil into measuring cup to verify amount of oil being replaced.
CAUTION: ONLY AN ENVIRO APPROVED TYPE OF OIL MAY BE USED IN THIS TYPE OF COMPRESSOR.
CAUTION: DO NOT OVERFILL COMPRESSOR WITH OIL OR SYSTEM PERFORMANCE WILL BE AFFECTED.
14.2.4.3
Measure an equal amount of new oil and add to compressor. Install oil plug and tighten.
14.2.4.4
Check system pressure per section 14.2. System is now ready for storage.
21-00-09-55-003
14.3
System Off Season Functional Tests:
NOTE: If ambient temperature is below 50° F (10°C), the pressure switch is designed to keep the system from operating and causing possible damage if operated for extended periods of time. In this case, it is recommended that the aircraft be heated above this threshold to enable the system to operate.
CAUTION: OPERATION OF THE SYSTEM AT LOW AMBIENT TEMPERATURES FOR MORE THAN 15 MINUTES CAN RESULT IN MAJOR DAMAGE OF THE R-134A COMPRESSOR.
14.3.1
During cold winter months, the system should be operated for 10-15 minutes every two weeks to maintain a thin oil film on the compressor output shaft dynamic seal to prevent shaft leakage.
14.3.2
Prior to turning on the air conditioning system (energizing the compressor drive), run blowers on high speed for a minimum of 5 minutes. This will aid in warming the refrigerant and bringing it up to an acceptable temperature enabling operation of the system.
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OPERATING, SERVICING, AND COMPONENT MAINTENANCE MANUAL(28)
