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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 14003
FEBRUARY 16, 2010
13.3.3
Charging the system with refrigerant is required on a new system installation or when “topped off”, the proper method is to recover the existing charge and charge with the appropriate mass of refrigerant. Refer to the reclaim/recycle equipment manufacturer’s instruction manual for recovery unit handling and operation. Refrigerant charges for the system are as follows in Table 6.
Aircraft Model
Refrigerant Charge (lbs.)
Cessna 510 Mustang
2.5 + - 0.1
Table 6 Refrigerant Charge
13.3.4
After refrigerant charging, ensure system is operating according to the typical operating values as outlined in table 7 below.
Outside Air Temperature
Suction Pressure
Discharge Pressure
(Deg F)
(PSIG)
(PSIG)
60-70
28
125 - 140
80
30
170 ±10
95
31
210 ± 10
105
32
237 ± 10
Table 7 Typical Operating Values
SUBTASK 21-00-09-60-003
13.4
Flushing the system (R-134a):
13.4.1
System flushing is required only when the system has experienced a catastrophic failure of the compressor or receiver drier. In addition, examination of the system refrigerant lubricant should be performed during component replacement. If this examination shows lubricant particulate contamination or unusual oil discoloration, a complete system flush is recommended.
WARNING: KEEP REFRIGERANTS AND OILS AWAY FROM OPEN FLAMES. REFRIGERANTS CAN
PRODUCE POISONOUS GASSES IN THE PRESENCE OF A FLAME. WORK IN A WELLVENTILATED
AREA AND AVOID BREATHING REFRIGERANT /LUBRICANT VAPOR MIST IF ACCIDENTAL
DISCHARGE OCCURS
13.4.2
Enviro recommends flushing R-134a systems using only R-134a refrigerant. General Motors service bulletin 83-12-21 should be referenced for flushing R-134a systems.
WARNING: REFRIGERANT RECOVERY/RECYLE SERVICE EQUIPMENT MUST BE APPROVED FOR USE WITH R-134a REFRIGERANT. RECYCLING MACHINES MUST BE APPROVED BY UNDERWRITERS LABORATORIES (UL) AND MEET SAE STANDARD J2210 AND SAE STANDARD J2099 FOR REFRIGERANT PURITY.
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 14004
FEBRUARY 16, 2010
WARNING: DO NOT INTRODUCE COMPRESSED AIR OR OXYGEN INTO AN AIR CONDITIONING SYSTEM OR REFRIGERANT CONTAINER. R-134a IN THE PRESENCE OF AIR OR OXYGEN ABOVE ATMOSPHERIC PRESSURE MAYFORM A COMBUSTABLE MIXTURE.
CAUTION: ENVIRO SYSTEMS INC. DISCOURAGES THE USE OF ALL OTHER FLUSHING AGENTS DUE TO THE DIFFICULTY OF ASSURING THAT ALL THE SOLVENT HAS BEEN REMOVED. FLUSH AGENTS REMAINING IN THE SYSTEM RESULT IN POOR COMPRESSOR LUBRICATION AND PREMATURE COMPONENT FAILURE. IT HAS BEEN FOUND THAT RESIDUAL AMOUNTS OF FLUSH AGENTS MAY ACT AS CORROSIVES AND AFFECT THE INTEGRITY OF SEALS, O-RINGS, AND OTHER COMPONENTS.
13.4.3
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)
13.4.4
Verify that power is removed from aircraft. If it is not practical to remove aircraft power, technician must pull and collar applicable circuit breakers.
13.4.5
Connect certified reclaim charging and recycle cart manifolds to system service ports (ensure reclaim cart is properly grounded) and recover remaining refrigerant (refer to the reclaim equipment manufacturer’s instruction manual for recovery unit handling and operation).
13.4.6
Remove expansion valve and install fittings and hoses to close loop after valve removal.
13.4.7
Remove the receiver dryer and install a jumper hose between the open ports.
13.4.8
Apply power to recovery unit and run for a minimum of 15 minutes.
13.4.9
Check for leaks during flushing process. If leaks are detected, stop machine and repair leaks before continuing.
13.4.10
Confirm that recovery unit shuts down at the end of the selected recovery time.
13.4.11
Turn power off at the recovery unit and remove from the aircraft.
CAUTION: ALWAYS USE PROTECTIVE COVERINGS AND/OR PROTECTIVE CAPS ON OPEN OR EXPOSED HOSES, PLUMBING, ETC. THIS WILL ENSURE THAT THE COMPONENT STAYS FREE DIRT, DUST, OR ANY OTHER FOREIGN MATTER.
13.4.12
Reconnect the lines to the compressor (refer to Assembly, Section 9)
13.4.13
Remove fittings and hoses and re-install the expansion valve (refer to Assembly, Section 9)
13.4.14
Remove jumper hoses from receiver dryer ports and install a new receiver dryer (refer to Assembly, Section 9)
　
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