Component Maintenance Manual
EFFECTIVITY: ALL
21-00-22
Introduction
Page 14
JULY 21, 2011
2.3.3.3 CONDENSER COIL ASSEMBLY
: The condenser coil assembly is a copper tube and
aluminum fin configuration with 6061-T6 aluminum support brackets. The coil heat
rejection is 26,000 BTUH based on a 117°F ambient day. Condenser cooling airflow
and coil sizes are based on the design cooling capacity and compressor input
horsepower. This assembly requires an airflow of 900 CFM for proper operation.
2.3.3.4 RECEIVER DRYER ASSEMBLY
: The receiver-dryer assembly consists of a
refrigerant container, Schrader valve, high pressure charging port and a binary
pressure switch. The receiver-dryer is constructed of aluminum alloy and contains a
standpipe, wire filter, and desiccant. The receiver dryer assembly is provided with a
corrosion resistant baked enamel finish. The receiver volume is approximately 40
cubic inches and can store up to 1.8 pounds of refrigerant at 240 PSIG. The Schrader
valve located in the container inlet port allows for the binary pressure switch to be
removed without venting the system refrigerant charge.
2.3.3.5 BINARY PRESSURE SWITCH: The binary pressure switch performs two major
functions. The first function prevents the R12 compressor from operating if the
system charge is lost or the ambient temperature is too low. The second function
stops the compressor from operating if the head pressure increases to an unsafe
level. The high pressure cutout is at 305 PSIG on rise and the low pressure cutout is
at 22 PSIG falling.
2.3.4 The EVAPORATOR MODULE ASSEMBLY (PN 1250200-42 (L) /-43 (C,R)) has a rated
cooling capacity of 7000 BTUH at an ambient air temperature of 80° F (db), and 50% RH
(relative humidity). The assembly provides an air flow of 200 CFM (cubic feet per minute) in
order to maintain these performance specifications.
2.3.5 The Evaporator Module Assembly is packaged to meet the aircraft installation requirements
and contains the following major components (refer to Figure 10002):
Coil Assembly
Blower Motor
Blower Wheel
Blower Scroll
Expansion Valve
Evaporator Housing
2.3.5.1 COIL ASSEMBLY
: The evaporator coil assembly contains the evaporator coil,
mounting hardware, and refrigerant plumbing connections. The coil is constructed of
copper tube and aluminum fins with aluminum support brackets made of 6061-T6
Aluminum. The assembly receives its air (return air) from the suction created by the
blower assembly. This air is conditioned and returned to the cabin.
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