Component Maintenance Manual
12037 N Highway 99
Seminole, OK 74868
Phone (405) 382-0731
Fax (405) 382-0737
http://www.enviro-ok.com
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 charge for the Pilatus PC12 system is 2.0 lbs.
SUBTASK 21-00-23-60-003
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 WELL VENTILATED
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.
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.
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 Condenser 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.
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