12037 N Highway 99
Seminole, OK 74868
Phone (405) 382-0731
www.enviro-ok.com
www.safran‐
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‐solutions.com
Copyright © 2020
Original Release
ATA 21‐00‐60
Page | 44
12.3.
Evacuating the system
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.
12.3.1. 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).
12.3.2. Verify power is removed from the aircraft. If it is not practical to remove aircraft power, the technician
must pull and collar applicable circuit breakers.
12.3.3. If required perform a leak check procedure.
12.3.4. Connect certified reclaim charging and recycle cart manifolds to system service ports.
12.3.5. Open both valves and reclaim and recycle the system’s refrigerant charge (refer to the cart
manufacturer’s instruction manual for handling and operation procedures). Once the refrigerant is
reclaimed and recycled, apply a vacuum on the system for a minimum of 30 minutes. The vacuum
should attain 25 – 27 in.hg. in 10 – 15 minutes. Allow pump to hold a vacuum for at least an additional
15 minutes.
CAUTION:
ANY CHANGE IN VACUUM PRESSURE OR FAILURE TO ACHIEVE A SYSTEM VACUUM OF 29
IN.HG. INDICATES THE PRESENCE OF A PLUMBING LEAK. REPEAT LEAK CHECK PROCEDURE TO
LOCATE AND REPAIR ALL LEAKS.
CAUTION:
EXCESSIVE WATER AND/OR AIR IN THE SYSTEM WILL CAUSE PRESSURES TO RISE AND
THE EXPANSION VALVE TO FREEZE UP.
12.3.6. System is not ready for refrigerant charging.
12.4.
Charging the system
WARNING:
SYSTEM DAMAGE CAN OCCUR FROM OVERCHARGING OR UNDERCHARGING THE
SYSTEM TO THE SPECIFIED AMOUNT OF REFRIGERANT.
12.4.1. Gain access to the Compressor Drive Module.
12.4.2. Verify power is removed or that the applicable circuit breakers are pulled and collared.
12.4.3. 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 PC12 Model 19 is 2.3 lbs.
