VAL Avionics NAV 2000 Installationsanleitung PDF herunterladen (Seite 273)

Accessory Installation and Configuration

SkyView System Installation Guide - Revision R 15-5

recommendations for wire gauge choice, given wiring run length. It assumes 10 amps of

current.

Run length (in feet)

Gauge

0 to 7

18 AWG

7 to 9

16 AWG

10 to 16

14 AWG

17 to 24

12 AWG

25 to 40

10 AWG

Table 49–From FAA AC 43.13-1B, page 11-30

Probe to Controller Wiring

As mentioned above, it is preferable that the heater controller box be mounted near enough to

the probe that 5 wires between the controller and probe can be connected without extension.

The three mating pairs of colored wires–terminated with Fastons–are used to carry the current

to the heating element in the probe. The 2 white wires are for temperature measurement, and

can be small. If you have mounted the heater controller near the probe and do not need to

extend the wires between the two, simply plug each wire on the controller into its

corresponding like-colored wire from the probe.

If you do need to extend the wires between the probe and the controller, use the

recommended wire size (see Table 49) for your run length. Since extending the wire runs

requires that you cut the connectors off the 5 wires between the probe and controller, splice

the extension wires between the probe and controller using butt splices or other similarly

secure method. The white wires are not polarity-dependent. Additionally, as the white wires do

not carry any significant current, you may extend them with 26 AWG or larger for any run

length.

Controller Power Wiring

Three wires – colored red, black, and white – exit the controller for connection to your

electrical system. Power (between 10 and 15 volts DC) is fed to the controller via the red and

black wires. The maximum current draw of the heated pitot controller/probe is 10 amps. You

must route your own appropriately-sized wires to where the heater controller is mounted. Both

power and ground lines should be able to handle 10 amps with minimal voltage drop, as

recommended in Table 49.

The red wire should be connected through a pilot-accessible switch to the main power source

in the aircraft (limited to 15 volts DC). The switch allows you to manually turn the heater

controller on and off, depending on the situation. Install a 15 amp fuse at any point along the

power line to the heater controller. Remember that even when the controller is powered on, it

only heats the probe the amount necessary to maintain temperature.

The black wire should be permanently connected to ground. Cutting power to the heater

controller should occur via the red power line, not the black ground line.

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