---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Wed 02/10/10: 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 _____________________________________ Time: 07:35:38 AM PST US From: 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 ________________________________ Message 2 _____________________________________ Time: 09:42:47 AM PST US From: "Vern Little" Subject: Re: AeroElectric-List: 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: 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 _____________________________________ Time: 11:00:35 AM PST US From: "John Burnaby" Subject: Re: AeroElectric-List: 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 _____________________________________ Time: 01:09:34 PM PST US Subject: AeroElectric-List: Re: Pitot heat relays From: "pestar" 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 _____________________________________ Time: 06:06:36 PM PST US From: BobsV35B@aol.com Subject: Re: AeroElectric-List: 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) ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.