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CAUTION: DO NOT OVERFILL COMPRESSOR WITH OIL OR SYSTEM PERFORMANCE WILL BE AFFECTED.
12.4.4
Add new oil to the new compressor in the amount measured from the failed compressor. Contact Enviro Systems for proper oil.
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 14001
FEBRUARY 16, 2010
SERVICING
TASK 21-00-09-60-801
13.0
R-134a AIR CONDITIONING SYSTEM SERVICING PROCEDURES
SUBTASK 21-00-09-99F-016
13.1
General:
13.1.1
Reclaiming the system (R-134a) refrigerant charge is required on systems before system removal, after an accidental line break, component failure or when the system has excessive leaks. Due to the chemical nature of the refrigerant, every precaution must be taken to protect the service person from accidental exposure to the refrigerant. Follow all service precautions previously outlined.
WARNING: SERVICE TECHNICIANS ARE ADVISED TO OBSERVE STANDARD SAFETY PRECAUTIONS, SUCH AS WEARING PERSONAL SAFETY GEAR, TO PREVENT INJURY WHILE PERFORMING SERVICE TO THE UNIT.
CAUTION: SERVICE TECHNICIANS MUST PREVENT CONTAMINATION OF INTERNAL SYSTEM PLUMBING DURING ANY SERVICING AND/OR MAINTENANCE OPERATION. THIS INCLUDES NOT ALLOWING THE RECEIVER DRYER TO BE EXPOSED TO ATMOSPHERIC CONDITIONS FOR ANY LENGTH OF TIME. ALL PLUMBING LINES SHOULD REMAIN CAPPED WHENEVER POSSIBLE DURING THE SERVICING OF THE SYSTEM.
WARNING: DUE TO THE EVER INCREASING NUMBER OF ALTERNATE REFRIGERANTS BEING INTRODUCED ON THE MARKET, EXTREME CARE MUST BE TAKEN TO PREVENT THEIR USE IN THIS SYSTEM. ONLY R-134a REFREFRIGERANT IS APPROVED FOR USE IN THIS AIR CONDITIONING SYSTEM. ANY OTHER REFRIGERANT COULD CREATE A HAZARD TO BOTH THE AIRCRAFT AND SERVICE PERSONNEL.
13.1.2
Tools, fixtures, equipment, or consumable items required:
•
Small hand tools and socket set
•
Vacuum pump, air or electric (0-30 in.h.g.)
•
Refrigerant, R-134a
•
R-134a charging manifold with gauges and hoses
•
Thermometer, 0-150° F
•
Adjustable inspection mirror
•
Service light or flash light
•
Shop towels
•
RL100S Emkarate Ester refrigerant oil
•
External or aircraft power source, 200 amp.
•
Reclaim/ Recycle Cart (R-134a)
•
Hose adapter (1/2 in, male acme to ¼ female flare)
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 14002
FEBRUARY 16, 2010
SUBTASK 21-00-09-60-001
13.2
Evacuating the system (R-134a):
NOTE: The system must be evacuated for a minimum of 45 minutes to remove air and moisture which can cause the system to have less than optimal performance.
13.2.1
Gain access to the Compressor Drive Module (refer to the aircraft maintenance manual for removal of access panels and other hardware that might need to be removed)
13.2.2
Verify that power is removed from aircraft. If it is not practical to remove aircraft power, technician must pull and collar applicable circuit breakers.
13.2.3
If required perform leak check procedure.
13.2.4
Connect certified reclaim charging and recycle cart manifolds to system service ports.
13.2.5
Open both valves and reclaim and recycle the systems refrigerant charge (refer to the reclaim equipment manufacturer’s instruction manual for recovery unit handling and operation).Once the refrigerant is reclaimed and recycled apply vacuum on the system for approximately 30 minutes. System vacuum should attain 25-27 in. hg. in 10 to 15 minutes. Allow pump to hold a vacuum (29 to 30 in. hg.) for 15 minutes
CAUTION: ANY CHANGE IN VACUUM PRESSURE OR FAILURE TO ACHIEVE A SYSTEM PRESSURE OF 29 INCHES HG VACUUM INDICATES THE PRESENCE OF A PLUMBING LEAK. REPEAT LEAK CHECK PROCEDURE AND LOCATE AND FIX ALL LEAKS.
CAUTION: EXCESSIVE WATER AND/OR AIR IN THE SYSTEM WILL CAUSE PRESSURE TO RISE AND EXPANSION VALVE TO FREEZE UP.
13.2.6
System in now ready for refrigerant charging.
SUBTASK 21-00-09-60-002
13.3
Charging the system (R-134a):
WARNING: SYSTEM DAMAGE CAN OCCUR FROM OVERCHARGING OR UNDERCHARGING THE SYSTEM TO THE SPECIFIED AMOUNT OF REFRIGERANT.
13.3.1
Gain access to the Compressor Drive Module (refer to the aircraft maintenance manual for removal of access panels and other hardware that might need to be removed)
13.3.2
Verify that power is removed from aircraft. If it is not practical to remove aircraft power, technician must pull and collar applicable circuit breakers.
Component Maintenance Manual
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OPERATING, SERVICING, AND COMPONENT MAINTENANCE MANUAL(26)
