Component Maintenance Manual
EFFECTIVITY: ALL
21-00-22
Page
14003
JULY 21, 2011
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 5.
Aircraft Model
Refrigerant Charge (lbs.)
Pilatus PC12
2.0 lbs
Table 5 Refrigerant Charge
SUBTASK 21-00-22-60-003
13.4
Flushing The System (R12):
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 R12 systems using only R12 refrigerant. General Motors
service bulletin 83-12-21 should be referenced for flushing R12 systems.
WARNING
: REFRIGERANT RECOVERY/RECYLE SERVICE EQUIPMENT MUST BE APPROVED FOR
USE WITH R12 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. R12 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.
