12037 N Highway 99
Seminole, OK 74868
Phone (405) 382-0731
www.enviro-ok.com
www.safran‐
passenger
‐solutions.com
Copyright © 2020
Original Release
ATA 21‐00‐60
Page | 12
2.3. System Component Description and Operation:
The R-134A air conditioning system installed on the Pilatus PC12 M19 Aircraft uses the
following major system components:
Direct Drive Compressor Module
1150950-3 (Supersedes 1150950-2)
Evaporator Module Assembly
1150900-2 (L) / 1150910-2 (R)
Condenser Coil Assembly w/Receiver Dryer
1150970-1
Axial Condenser Fan
1250435-30
2.3.1. The direct drive compressor module has a rated cooling capacity of 17,000 BTUH when
operating with the other components in the Pilatus PC12 M19 Aircraft at an ambient
temperature of 95°F OAT. Under this condition, the current draw is limited to 105 AMPS at
28 VDC.
The Compressor Module Assembly is packaged to meet the aircraft installation
requirements and contains the following major components:
• Brushless Compressor Drive Motor
• Compressor Assembly
•
Brushless Motor Controller
2.3.1.1.
BRUSHLESS COMPRESSOR DRIVE MOTOR: The drive motor is attached to the
compressor shaft via a coupling allowing for direct speed control of the compressor.
2.3.1.2.
COMPRESSOR ASSEMBLY: The compressor assembly is a 3d scroll type with a
displacement of 65 CC/Rev and is to only be used with R134a refrigerant and RL-46H
refrigerant oil.
2.3.1.3.
BRUSHLESS MOTOR CONTROLLER: The motor controller is provided with the
following features to ensure safe operation.
Run Signal – Reports Normal Operation
Over Temperature Shutdown – Fail Signal
Locked Rotor Detection – Fail Signal
Hall Sensor Failure – Fail Signal
Motor Field Winding Short – Fail Signal
