Today's Message Index:
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1. 07:35 AM - Pitot heat relays ()
2. 09:42 AM - Re: Pitot heat relays (Vern Little)
3. 11:00 AM - Re: Re: Starter engaged light, was Starter and contactor (John Burnaby)
4. 01:09 PM - Re: Pitot heat relays (pestar)
5. 06:06 PM - Re: Re: Starter engaged light, was Starter and contactor (BobsV35B@aol.com)
Message 1
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Subject: | Pitot heat relays |
I've been looking at relays for pitot heat and landing lights, and have
found several that look to me like they might work. 20A should be sufficient
but the 40A version has mounting tabs to secure them behind the panel. Here
are representative specs:
http://www.azettler.com/pdfs/az977.pdf
http://www.azettler.com/pdfs/az973.pdf
http://www.azettler.com/pdfs/az9731.pdf
http://www.azettler.com/index.php?id=electromechanical_relays_other2
Are there specific things I should be concerned about when specifying relays
for this application? Is a sealed relay recommended in the cockpit?
Resistors/diodes across the coil are available but not generally in stock.
(I can add the diode if necessary here.) The cost is < $2 in single units
from:
http://www.onlinecomponents.com
http://www.onlinecomponents.com/buy/AMERICAN-ZETTLER/AZ9731-1A-12DC1/
They have a $35 minimum order, but I'm sure I can find other things to fill
out the order.
David Barrett
Message 2
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Subject: | Re: Pitot heat relays |
These are standard automotive relays. If you don't want to place the
minimum order, pick one up at your favorite auto parts store.
I use devices that have internal resistors (or diodes) because it saves a
bit of wiring-- but have 14 of them in my aircraft [another long topic about
switch failures vs relay reliability].
You can also purchase relay sockets that make installation a bit easier, if
you wish.
Vern Little
Vx Aviation
--------------------------------------------------
From: <flylists@dbarrett.net>
Sent: Wednesday, February 10, 2010 7:26 AM
Subject: AeroElectric-List: Pitot heat relays
>
> I've been looking at relays for pitot heat and landing lights, and have
> found several that look to me like they might work. 20A should be
> sufficient
> but the 40A version has mounting tabs to secure them behind the panel.
> Here
> are representative specs:
>
> http://www.azettler.com/pdfs/az977.pdf
> http://www.azettler.com/pdfs/az973.pdf
> http://www.azettler.com/pdfs/az9731.pdf
> http://www.azettler.com/index.php?id=electromechanical_relays_other2
>
> Are there specific things I should be concerned about when specifying
> relays
> for this application? Is a sealed relay recommended in the cockpit?
> Resistors/diodes across the coil are available but not generally in stock.
> (I can add the diode if necessary here.) The cost is < $2 in single units
> from:
> http://www.onlinecomponents.com
> http://www.onlinecomponents.com/buy/AMERICAN-ZETTLER/AZ9731-1A-12DC1/
> They have a $35 minimum order, but I'm sure I can find other things to
> fill
> out the order.
>
> David Barrett
>
>
>
> Checked by AVG - www.avg.com
> 07:35:00
>
Message 3
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Subject: | Re: RE: Starter engaged light, was Starter and contactor |
Hello OB,
The switch has an independently switched lamp. So the lamp does not
necessarily go on when the starter is activated. As stated, I plan to
connect one pole of my dpst switch, through the switch, to the lamp for
the test circuit. The hung starter circuit is in parallel with the test
circuit, but derives power from the fat wire between starter solenoid
and starter.
John
Message 4
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Subject: | Re: Pitot heat relays |
Vern
What manufacturers relays are you using where the diodes are built in?
Thanks
Peter Armstrong
Auckland, New Zealand
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=285873#285873
Message 5
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Subject: | Re: RE: Starter engaged light, was Starter and contactor |
Sounds Fair To Me!!
Happy Skies,
Old Bob
In a message dated 2/10/2010 1:02:32 P.M. Central Standard Time,
jonlaury@impulse.net writes:
Hello OB,
The switch has an independently switched lamp. So the lamp does not
necessarily go on when the starter is activated. As stated, I plan to connect
one
pole of my dpst switch, through the switch, to the lamp for the test
circuit. The hung starter circuit is in parallel with the test circuit, but
derives power from the fat wire between starter solenoid and starter.
John
(http://www.matronics.com/Navigator?AeroElectric-List)
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