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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
EFFECTIVITY: ALL 21-00-09
Introduction
Page 14
FEBRUARY 16, 2010
SUBTASK 21-00-09-99F-008
2.3
System Component Description and Operation:
2.3.1
The R-134a air conditioning system on the Cessna Model 510 uses the Compressor Drive Module Assembly (PN 1133610-4), the Condenser Blower Assembly (PN 1134620-5), two (2) Evaporator Module Assemblies (PN 1133300-1), the Receiver Dryer (PN 1134275-1), and the Check Valve (PN 1310150-2).
2.3.2
The COMPRESSOR DRIVE MODULE ASSEMBLY (PN 1133610-3) has a rated capacity of 13,000 BTUH when operating with the other components in the Cessna Model 510 aircraft at an ambient temperature of 105°F OAT and with a cabin temperature of 80°F dry bulb and 67°F wet bulb. Under this condition the nominal current consumption is 82 AMPS at 28 VDC.
2.3.3
The Compressor Drive Module Assembly is packaged to meet the aircraft installation requirements and contains the following major components (refer to Figure 10001):
•
Compressor / Fan Drive Motor (10)
•
Compressor Assembly (50)
2.3.3.1
COMPRESSOR DRIVE MOTOR: The compressor drive motor (10) has a double-ended shaft and operates on 28 VDC power with a current draw of 77 AMPS nominal. One output shaft drives the R134a compressor and the other end drives the cooling fan. The motor design power is 2.33 HP at 5920 RPM. The motor 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 motor shaft is supported on high speed ball bearings for reliability and friction reduction.
2.3.3.2
COMPRESSOR ASSEMBLY: The compressor assembly (50) contains an R134a compressor and 5.01 inch pitch diameter pulley assembly. The compressor incorporates a six-piston wobble plate, variable displacement design. The compressor also features anti-slugging features that eliminate the need for a suction trap/accumulator. The compressor displacement is 6-125 cc/rev. and has light-weight aluminum housing. The pulley assembly is designed for a positive grip .375 pitch timing belt and contains a radial bearing to assure no side loads are transmitted into the compressor input shaft. The assembly is designed for an operating speed of 1000-3000 RPM and has a maximum speed of 8000 RPM.
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 15
FEBRUARY 16, 2010
2.3.4
The CONDENSER BLOWER ASSEMBLY (PN 1134620-5) is designed to provide up to 18,000 (BTUH) of heat rejection capacity with an ambient air inlet condition of 105° F (db) and 50% RH (relative humidity). The condenser blower airflow is 600 CFM (cubic feet per minute) with a static pressure of 2.0 in.w.g. Voltage is 28 VDC and current is 20 AMPS (max).
2.3.5
The Condenser Blower Assembly is packaged to meet the aircraft installation requirements and contains the following major components (refer to Figure 10002):
•
Vane Axial Blower (70)
•
Shroud Assembly (30)
•
Condenser Coil Assembly (20)
2.3.5.1
VANE AXIAL BLOWER: A brushless D.C. three blade, 7.0 inch diameter fan, supplies the condenser cooling air. The fan blade is constructed of A356 aluminum alloy, weighs 1 lb., and has a speed rating up to 9500 RPM. The fan motor is a 28 VDC brushless design, built to increase reliability over the brush motor design.
2.3.5.2
SHROUD ASSEMBLY: The shroud assembly is constructed of .093 Lexan, a high impact, fire retardant, self extinguishing, corrosion resistant, lightweight polycarbonate material. The shroud assembly also includes a support bracket that is constructed of 6061-T6 aluminum.
2.3.5.3
CONDENSER COIL ASSEMBLY: The condenser coil assembly is a copper tube and aluminum fin configuration with 6061-T6 aluminum support brackets. The required coil heat rejection is 18,000 BTUH based on a 105°F ambient day. Condenser cooling airflow and coil sizes are based on the design cooling capacity and compressor input horsepower. The coil working pressure is up to 530 PSIG.
2.3.6
The EVAPORATOR MODULE ASSEMBLIES (PN 1133300-1) are designed to provide 7,000 (BTUH) of cooling capacity each, with an ambient air inlet condition of 80° F (db) and 50% RH (relative humidity). The evaporator module provides an air flow of 200 CFM (cubic feet per minute). The blower is designed to be used in both the air conditioning mode and as a recirculation mode during aircraft heating. The blower contains three (3) speeds (high, mid, and low) with mid speed 50% of high speed and low speed 25 % of high speed. The assembly operates on 28 VDC, 10 Amps max, and has a power usage of 280 Watts max.
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OPERATING, SERVICING, AND COMPONENT MAINTENANCE MANUAL(7)
