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Component Maintenance Manual
12037 N Highway 99
Seminole, OK 74868
Phone (405) 382-0731
Fax (405) 382-0737
http://www.enviro-ok.com
Copyright © 2017
ATA 21-00-23
P a g e
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15
Revision 10
June 1, 2017
SUBTASK 21-00-23-99F-008
2.3
System Component Description and Operation:
2.3.1
The R-134A air conditioning system installed on the Pilatus PC12 Aircraft uses the following
major system components:
•
Compressor Condenser Module Assembly
1134400-13
1134400-53 Supersedes-13
1134400-56 Limited Serial Numbers
1134400-59 Improved Brush Life
•
Evaporator Module Assembly
1134200-42 (L) / -43 (C&R)
Superseded by 1134200-60 (L)/-61 (R)/-63 (C)
2.3.2
The COMPRESSOR CONDENSER MODULE ASSEMBLY (PN 1134400-13/-53/-56/-59)
has a rated cooling capacity of 17,350 BTUH when operating with the other components in
the Pilatus PC12 Aircraft at an ambient temperature of 95°F OAT. Under this condition, the
nominal current draw is 100 AMPS at 28 VDC.
2.3.3
The Compressor Condenser Module Assembly is packaged to meet the aircraft installation
requirements and contains the following major components (refer to Figure 10001):
•
Compressor Drive Motor (10C)
•
Compressor Assembly (40A)
•
Condenser Coil (120A)
•
Receiver Dryer Assembly (50C)
•
Binary Pressure Switch (60A)
2.3.3.1
COMPRESSOR DRIVE MOTOR: The compressor drive motor has a double-ended
shaft and operates on 27.5 VDC power with a rated current draw of 115 AMPS max.
One output shaft drives the R-134A compressor and the other end drives the motor
cooling fan. The motor design power is 3.2 HP at 5000-5250 RPM and is specially
designed to provide a high starting torque to overcome the compressor startup
requirements. The motor is a brush commutated permanent magnet design and was
selected for its efficiency, excellent controllability, long life, and low vibration. The
shaft is supported on high speed ball bearings for reliability and friction reduction.
2.3.3.2
COMPRESSOR ASSEMBLY: The compressor assembly contains an R-134A
compressor and 5.01 inch pitch diameter pulley assembly. The compressor also
features a six piston wobble plate design as well as anti-slugging features that
eliminate the need for a suction trap/accumulator. The compressor has a light-weight
aluminum housing. The pulley assembly is designed for a high strength, positive grip
240L100 timing belt and contains a radial bearing to assure no side loads are
transmitted into the compressor input shaft. The assembly is designed for continuous
operation.