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Wiring diagram question for Pitot Heat On indicator light

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nuckolls.bob(at)aeroelect
Guest

Posted: Thu Feb 17, 2011 7:32 am Post subject: Wiring diagram question for Pitot Heat On indicator light

At 09:07 AM 2/17/2011, you wrote:




Guys,

I'm using Bob's pitot heat.pdf schematic as the base for a "Pitot 

Heat ON" amber LED light on my annunicator / warning light panel.



http://www.aeroelectric.com/PPS/DeIce/Pitot_Heat.pdf



In comparing this schematic to his article titled "Failure Detection 

and Annunciation I notice a few differences in the two schematics.

http://www.aeroelectric.com/articles/Failure_Detection_and_Annunciation.pdf



Questions:

1.  In pitot_heat.pdf the relay is positioned just before the Pitot 

heater load and after the Reed switch sensor, vs in the second 

article the relay is positioned BEFORE the Reed switch sensor.   Does 

it matter?



    No

2. The Reed switch current sensor wire layout is different in the two 

articles.  For example, the LED light wire is after the resistor in 

one, -vs- the LED wire is after the Radio Shack 275-232 reed relay in 

the second article.   Does it matter?



    Depends on what you want to display.

    Light ON = "Pitot heat powered up and

    drawing current" (Page 3)



    Light ON = "Pitot heat powered but NOT

    drawing current". (Page 4)

   Bob . . .

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plevyakh

Joined: 10 Jan 2011
Posts: 39

Posted: Thu Feb 17, 2011 7:56 am Post subject: Re: Wiring diagram question for Pitot Heat On indicator li

Thanks Bob...that helps.



Can you comment on use of the 18AWG fuselink in the Pitot Heat.pdf schematic in place of a 15amp fuse?



Why wouldn't I just use a 15amp fuse at the bus to protect my wire?



Thanks,

Howard

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_________________
Howard Plevyak
GlaStar / Cincinnati, Ohio

plevyakh

Joined: 10 Jan 2011
Posts: 39

Posted: Thu Feb 17, 2011 7:59 am Post subject: Re: Wiring diagram question for Pitot Heat On indicator li

Thanks Bob...that helps.



Can you comment on use of the 18AWG fuselink in the Pitot Heat.pdf schematic in place of a 15amp fuse?



Why wouldn't I just use a 15amp fuse at the bus to protect my wire?



Thanks,

Howard

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_________________
Howard Plevyak
GlaStar / Cincinnati, Ohio

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