AeroElectric-List Digest Archive

Wed 02/10/10


Total Messages Posted: 5



Today's Message Index:
----------------------
 
     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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    Time: 07:35:38 AM PST US
    From: <flylists@dbarrett.net>
    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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    Time: 09:42:47 AM PST US
    From: "Vern Little" <sprocket@vx-aviation.com>
    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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    Time: 11:00:35 AM PST US
    From: "John Burnaby" <jonlaury@impulse.net>
    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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    Time: 01:09:34 PM PST US
    Subject: Re: Pitot heat relays
    From: "pestar" <peter@reivernet.com>
    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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    Time: 06:06:36 PM PST US
    From: BobsV35B@aol.com
    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) (http://www.matronics.com/contribution)




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