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2.3.7
The Evaporator Module Assembly is packaged to meet the aircraft installation requirements and contains the following major components (refer to Figure 10003):
•
Coil Assembly
•
Blower Motor (10)
•
Blower Wheel (20)
•
Expansion Valve (60)
•
Evaporator Housing (40,50)
Component Maintenance Manual
12037 N Highway 99
Seminole, OK 74868
Phone (405) 382-0731
Fax (405) 382-0737
http://www.enviro-ok.com
EFFECTIVITY: ALL 21-00-09
Introduction
Page 16
FEBRUARY 16, 2010
2.3.7.1
COIL ASSEMBLY: The evaporator coil assembly contains the evaporator coil, mounting hardware, rubber grommets and female flared fittings. The coil is constructed of copper tube and aluminum fins with aluminum support brackets.
2.3.7.2
BLOWER MOTOR: The evaporator blower motor operates on 28 VDC with a current draw of 10 amps and has a design RPM of 5250-6250. The blower motor is a brushless design with an integrated controller. It was selected for its efficiency, excellent controllability, long life and low vibration at high speeds. The motor has three (3) speeds, low speed designed for the heating recirculation requirement and mid and high speed designed for maximum system cooling. The motor shaft is supported on high-speed ball bearings for reliability and friction reduction.
2.3.7.3
BLOWER WHEEL: The blower wheel is the component that is used in concert with the blower motor and provides for the movement of air.
2.3.7.4
EXPANSION VALVE: The expansion valve is a thermostatic type. The valve provides the proper refrigerant flow while maintaining constant return gas superheat at all evaporator heat load conditions. Controlling the evaporator refrigerant flow based on cooling demand prevents coil freeze up. This allows the system cooling capacity to best meet transient aircraft heat load demands.
2.3.7.5
EVAPORATOR HOUSING: The evaporator housing and blower scroll are constructed of high impact, fire retardant, self extinguishing, and corrosion resistant, lightweight polycarbonate material (Lexan F-6000). The blower scroll has successfully passed blower wheel containment testing.
2.3.8
The RECEIVER DRYER ASSEMBLY (PN 1134275-1) consists of a refrigerant container, Schrader valve, high pressure charging port and a binary pressure switch. The receiver-dryer is constructed of steel and contains a standpipe, wire filter, desiccant and a sight glass for observing refrigerant charge. 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.
2.3.9
The CHECK VALVE (PN 1310150-2) is a component used in the bleed air system and is not directly related to the air conditioning system. The only maintenance actions for this component are removal and replacement. For removal and replacement of the check valve, refer to the aircraft maintenance manual.
Component Maintenance Manual
12037 N Highway 99
Seminole, OK 74868
Phone (405) 382-0731
Fax (405) 382-0737
http://www.enviro-ok.com
EFFECTIVITY: ALL 21-00-09
Page 1001
FEBRUARY 16, 2010
TESTING AND FAULT ISOLATION
TASK 21-00-09-70-801
3.0
R-134a AIR CONDITIONING SYSTEM COMPONENT – TESTING AND FAULT ISOLATION
SUBTASK 21-00-09-99F-009
3.1
General:
3.1.1
Testing and Fault Isolation of the R-134a Air Conditioning System may be necessary if the system does not operate and/or perform in accordance with information contained herein. Therefore it is necessary for the service personnel to diagnose the discrepancy by troubleshooting the system and its components. To assist in this diagnoses, refer to table 3 (Trouble Shooting List)
SUBTASK 21-00-09-70-001
3.2
Compressor Drive Module Assembly / Condenser Blower Assembly testing procedures:
3.2.1
Ensure that power is applied to the aircraft and that the air conditioning system is switched on using the cockpit mounted selector switch. Gain access to the Compressor Drive Module and Condenser Blower Assembly (refer to the aircraft maintenance manual for removal of access panels and other hardware that might need to be removed). Verify that these components are operating and perform the following:
•
Verify that system is running smoothly and that there is no excessive noise and/or vibration coming from the assembly.
•
Verify that the system is cooling properly.
3.2.2
If there is excessive noise and/or vibration coming from the compressor drive module and/or the condenser blower assembly or the system is not cooling, refer to the Disassembly procedures in section 5 and Check (inspection) procedures in section 7. This will help in identifying whether one or more components are dirty or damaged and are in need of repair or replacement.
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OPERATING, SERVICING, AND COMPONENT MAINTENANCE MANUAL(8)
