Brief Description: Flightline AC System tray, flap sensor, and flap m
Feb 16th, 2013 (8 hours). Started the day with wiring all the electrical components on the Flightline AC system tray located behind the aft baggage bulkhead. I had already wired the condenser relay so I was only concentrating on the evaporator fan 3 relays and the switch located on the dryer. I needed to pull new wire from the front of the fuselage to the system tray and this took longer than expected since my little helper (Casey) had tugged on one of the “fish tape” lines I had previously ran thru the conduit under the aft baggage area. Once I got back on track with the wire pulls I was able to pull 4- 2 conductor cables as needed for the AC controls. I wired the three relays, low, med, and high fan connections to the control lines from the CB-1 controller that will be mounted in the panel up front. I then ran the power wires from the aft circuit breaker board located just below the AC tray up to the relays. I wired in diodes across all the relays since the relays only have an internal resistance and not a diode. The wiring diagram shows they have internal diodes but looking at the data sheet for the specific relays I was shipped shows otherwise. The dryer located on the aft section of the AC tray has a “sensor switch” that helps keep the system safe in operational parameters by sensing the low and high pressure of the system. I don’t know the technical term for it so I will just call it a switch for now. This sensor switch is connected to the circuit breaker board below the tray and fused at 5 amps, it then passes thru the sensor and makes its way back to the front of the AC to be connected to the relay that will control the compressor. Relay Pin 85 will have the sensor connected to to it, Pin 86 will be connected to CB-1 Pin 2. A sensor (thermister) is placed just in front of the evaporator for sensing the return air, this sensor allows the CB-1 to try and maintain a set temperature. It will control the compressor as needed off/on to allow for the system to become more efficient. I finished the AC wiring
