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AirComm Corporation Bell 429 Air Conditioning 429EC200M1Rev9 User Manual
AirComm Corporation Bell 429 Air Conditioning 429EC200M1Rev9 User Manual
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AIR CONDITIONER SERVICE MANUAL 429EC-200M-1 Revision 9 Page 53 E. Disconnect evaporator blower from existing aircraft wiring at connector located on aft portion of the aft evaporator assembly. F. Remove and retain the attaching hardware located at the top and bottom of evaporator assembly and remove from aircraft. Installation/Replacement A. Install the evaporator assembly in the appropriate location. B. Reinstall the attaching hardware at the top and the bottom of the evaporator assembly. C. Reconnect the evaporator blower to the existing aircraft wiring at connector located on the aft portion of the aft evaporator assembly. CAUTION Always use a backup wrench when removing, or installing refrigerant line fittings. D. Reconnect aircraft plumbing for the evaporator assembly. G. Replace all O-Rings before connecting refrigerant plumbing to evaporator fittings using a back-up wrench. Torque refrigerant line connections to 30–35 inch-lbs (3.4-4.0 Nm) for the #6 fitting and 40–45 inch-lbs (4.6-5.1 Nm) for the #8 fitting. E. Reconnect the blower outlet ducting from the evaporator assembly. CAUTION Refrigerant servicing should be performed by qualified personnel only. NOTE An electronic leak detector should be used any time a component is replaced or the system has been opened, to insure trouble free operation of the air conditioner system. F. Service air conditioner in accordance with Chapter 6 of this manual. G. Install any cowlings removed to gain access to the aft evaporator assemblies. 7. Removal and Replacement of Condenser Assembly Removal A. It is necessary to access the upper transmission compartment to remove, replace, the condenser assembly. B. It will be necessary to evacuate (discharge) the refrigerant from the system to remove and replace the condenser assembly. Instructions for servicing of the system are found in Chapter 6 servicing of this manual.
AIR CONDITIONER SERVICE MANUAL 429EC-200M-1 Revision 9 Page 54 CAUTION Refrigerant servicing should be performed by qualified personnel only. C. Disconnect the condenser blower assembly from the aircraft wiring at the existing connector. D. Disconnect the aircraft plumbing from the condenser assembly and cap to prevent oil leakage. E. Remove and retain the attaching hardware located on top and bottom of the condenser assembly and remove from the aircraft. Installation/Replacement A. Install the condenser assembly in the appropriate location. B. Reinstall the attaching hardware on top and the bottom of the condenser assembly. CAUTION Always use a backup wrench when removing, or installing refrigerant line fittings. C. Reconnect the aircraft plumbing to the condenser assembly. D. Replace all O-Rings before connecting refrigerant plumbing to evaporator fittings using a back-up wrench. Torque refrigerant line connections to 30–35 inch-lbs (3.4-4.0 Nm) for the #6 fitting and 40–45 inch-lbs (4.6-5.1 Nm) for the #8 fitting. E. Reconnect the condenser blower assembly to the aircraft wiring at the existing connector. CAUTION Refrigerant servicing should be performed by qualified personnel only. NOTE An electronic leak detector should be used any time a component is replaced or the system has been opened, to insure trouble free operation of the air conditioner system. F. Service air conditioner in accordance with Chapter 6 of this manual. G. Install any cowlings removed to gain access to the condenser assembly.
AIR CONDITIONER SERVICE MANUAL 429EC-200M-1 Revision 9 Page 55 8. Removal and Replacement of Condenser Blower Assembly Removal A. It is necessary to access the upper transmission compartment and remove the condenser assembly to remove, replace, the condenser blower assembly. (See condenser assembly removal instructions in Paragraph 7 of this Chapter. B. Remove and retain the attaching hardware and remove the condenser blower assembly from the condenser assembly. Installation/Replacement A. Install the condenser blower assembly onto the condenser assembly. B. Reinstall the attaching hardware to attach the condenser blower assembly to the condenser assembly. C. Reinstall the condenser assembly in accordance with Paragraph 7 of this Chapter. 9. Removal and Replacement of Receiver Drier Removal A. It is necessary to access the upper transmission compartment to remove, replace, the receiver drier. B. It will be necessary to evacuate (discharge) the refrigerant from the system to remove and replace the receiver drier. Instructions for servicing of the system are found in Chapter 6 servicing of this manual. CAUTION Refrigerant servicing should be performed by qualified personnel only. CAUTION Always use a backup wrench when removing, or installing refrigerant line fittings. C. Disconnect the refrigerant lines from the receiver drier bottle and cap to prevent oil leakage. D. Loosen, remove and retain the clamp(s) holding the receiver drier bottle. E. After the retaining clamps and plumbing lines have been removed the receiver drier bottle may be removed from the aircraft.
AIR CONDITIONER SERVICE MANUAL 429EC-200M-1 Revision 9 Page 56 Installation/Replacement A. Install the receiver drier in the appropriate location. B. Reinstall and tighten retaining clamps and plumbing lines to the receiver drier bottle. CAUTION Always use a backup wrench when removing, or installing refrigerant line fittings. C. Reconnect the refrigerant lines to the receiver drier bottle. D. Replace all O-Rings before connecting refrigerant plumbing to evaporator fittings using a back-up wrench. Torque refrigerant line connections to 30–35 inch-lbs (3.4-4.0 Nm) for the #6 fitting. CAUTION Refrigerant servicing should be performed by qualified personnel only. NOTE An electronic leak detector should be used any time a component is replaced or the system has been opened, to insure trouble free operation of the air conditioner system. E. Service air conditioner in accordance with Chapter 6 of this manual. F. Install any cowlings removed to gain access to the receiver drier. 10. Removal and Replacement of Bypass Valve Removal A. It is necessary to access the upper transmission compartment to remove, replace, the bypass valve. B. It will be necessary to evacuate (discharge) the refrigerant from the system to remove and replace the bypass valve. Instructions for servicing of the system are found in Chapter 6 servicing of this manual. CAUTION Refrigerant servicing should be performed by qualified personnel only. C. Disconnect the refrigerant lines from the bypass valve and cap to prevent oil leakage. D. Remove and retain the two (2) screws on the bottom of the valve holding it in place.
AIR CONDITIONER SERVICE MANUAL 429EC-200M-1 Revision 9 Page 57 E. De-pin the two (2) electrical splices connecting the bypass valve into the aircraft wiring. F. Remove the bypass valve from the aircraft. Installation/Replacement A. Install the bypass valve in the appropriate location. B. Re-pin the two (2) electrical splices connecting the bypass valve to the aircraft wiring. C. Reinstall the two (2) screws on the bottom of the valve to hold it in place. CAUTION Always use a backup wrench when removing, or installing refrigerant line fittings. D. Reconnect the refrigerant lines to the bypass valve. G. Replace all O-Rings before connecting refrigerant plumbing to evaporator fittings using a back-up wrench. Torque refrigerant line connections to 30–35 inch-lbs (3.4-4.0 Nm) for the #6 fitting and 40–45 inch-lbs (4.6-5.1 Nm) for the #8 fitting. CAUTION Refrigerant servicing should be performed by qualified personnel only. NOTE An electronic leak detector should be used any time a component is replaced or the system has been opened, to insure trouble free operation of the air conditioner system. E. Service air conditioner in accordance with Chapter 6 of this manual. F. Install any cowlings removed to gain access to the bypass valve. 11. Removal and Replacement of Binary Switch Removal A. It is necessary to access the upper transmission compartment to remove, replace, the binary switch. B. Disconnect electrical connectors from top of binary switch. NOTE Use the flats provided on the top of the switch body to tighten, do not attempt to tighten or loosen the pressure switch by hand.
AIR CONDITIONER SERVICE MANUAL 429EC-200M-1 Revision 9 Page 58 C. Unscrew switch from Schrader valve located on outlet tube from the compressor assembly. D. Remove binary switch. Installation/Replacement A. Install the binary switch in the appropriate location. NOTE Use the flats provided on the top of the switch body to tighten, do not attempt to tighten or loosen the pressure switch by hand. B. Screw the binary switch from the Schrader valve located on the outlet tube from the compressor assembly. C. Reconnect the electrical connectors from the top of the binary switch. D. Install any cowlings removed to gain access to the binary switch.
AIR CONDITIONER SERVICE MANUAL 429EC-200M-1 Revision 9 Page 59 CHAPTER 8 TROUBLESHOOTING 1. System Troubleshooting Prior to troubleshooting a defective system, it is advisable to conduct a visual inspection for general condition and obvious signs of damage or failure. The following matrix lists the easiest checks and the most likely problems. Problem Probable Cause Corrective Action System not Cooling (Evaporator blowers still operating) System is low or empty of refrigerant Evacuate the system, determine the origin of the refrigerant leak if applicable, and re-charge the system. Moisture or air in the system Evacuate the system, replace the receiver drier, and place the system under a vacuum for a minimum of 30 minutes before recharging the system. Compressor If the compressor has failed, it must be replaced. Compressor drive belt If the compressor drive belt has failed it will need to be replaced and adjusted. By-pass valve Check to insure the temperature control knob on the A/C control panel in the cockpit is in the full cold position, and the temperature control circuit breaker has not tripped. If the valve remains open (by-passing refrigerant) the valve will need replacement. Condenser blower motor / fan assembly Check to insure the condenser blower motor/fan assembly are receiving power, and the circuit breaker has not tripped; if the blowers still do not function, they may have failed internally and must be replaced. Condenser Blockage Check to insure the condenser fins are clear and free of any blockage. This will cause higher than normal discharge pressure in the system. System not cooling (Evaporator blowers not operating) Air conditioner control circuit breaker tripped Reset circuit breaker; if breaker will not reset, check for short in circuit. Forward or Aft evaporator blower circuit breaker tripped Reset circuit breaker; if breaker will not reset, check for short in circuit.
AIR CONDITIONER SERVICE MANUAL 429EC-200M-1 Revision 9 Page 60 Problem Probable Cause Corrective Action System not cooling (Evaporator blowers not operating) Forward and aft evaporator blower motor(s) Check for power to the motor(s), and for the free movement of the blower wheel; if the motor shaft does not turn smoothly the motor must be replaced Loss of cooling limited to one evaporator Expansion valve malfunction If cooling is lost in only one of the evaporators, and the blowers continue to function, it is most likely a blockage at the expansion valve orifice, this is most often caused by dirt in the system forming a blockage as the refrigerant passes through the valve. Evacuating the system and changing the receiver drier should cure this problem. If the above actions do not resolve the problem, the evaporator assembly must be replaced. External moisture (Condensate) in the area of forward / aft evaporator Leak in evaporator, or evaporator drainage system The suction or low side of the evaporator refrigerant plumbing may be cold and will condense moisture. Water noted in the area near the evaporator is normally caused by a loose, cracked, plugged, or disconnected drain line. To test, pour water into the face of the evaporator checking for proper drainage and note any leaks. NOTE The drain line consists of a tube which extends from the lower surface of the evaporators through the outer contour of the helicopter. Cover line with a layer of insulating cork tape. (Contact Air Comm Corporation Service Department for current pricing and availability of replacement components and parts) 2. System Schematics
AIR CONDITIONER SERVICE MANUAL 429EC-200M-1 Revision 9 Page 61 Figure 27 : 429EC -8424 -1 Relay Panel (Pre 2011) Applies to 429EC -200 & -202 kits ( S-6027EC Fwd Evap )
AIR CONDITIONER SERVICE MANUAL 429EC-200M-1 Revision 9 Page 62 Figure 28 : 429EC -8424 -2 Relay Panel Applies to 429EC -200, -202 ,-204, -206 kits (S-602 9EC Fwd Evap ) Pre July 2015 kits: 14 ga. July 2015 & newer kits: 12 ga.