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n8zg(at)mchsi.com
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 Posted: Thu Feb 12, 2009 7:52 am Post subject: Pitot Heat |
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Bob -
I have an AN5814-1 heated pitot-static tube. This monster draws over
20-amps at turn-on, and settles down around 12-amps or so. How would you
recommend I feed it?
Fat breaker on the panel?
S704-1 relay?
Something else?
neal
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recapen(at)earthlink.net
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| Posted: Thu Feb 12, 2009 8:10 am Post subject: Pitot Heat |
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I have a fuse on mine - 30 I think....looks like you're considering the switch too based on your possible use of a relay.
Ralph
RV6A N822AR (at) N06 3.7 hrs....
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rjquillin
Joined: 13 May 2007
Posts: 123
Location: KSEE
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| Posted: Thu Feb 12, 2009 8:43 am Post subject: Pitot Heat |
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At 07:49 2/12/2009, you wrote:
| Quote: | I have an AN5814-1 heated pitot-static tube. This monster draws over
20-amps at turn-on, and settles down around 12-amps or so. How would you
recommend I feed it? |
Just as a point of reference, we have the same PS tube in a certified AC.
It's fed through a 20A breaker and a Carling rocker switch with faston tabs.
No problems so far.
It will be 36 years this August.
Ron Q. [quote][b]
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Neal.George(at)hurlburt.a
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| Posted: Fri Feb 13, 2009 5:43 am Post subject: Pitot Heat |
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Thanks Ralph -
At the moment, it's wired with a fuse and a simple S700-1-2 Carling switch.
It'll work, but I'm concerned about running that much current thru this
switch.
Neal
I have a fuse on mine - 30 I think....looks like you're considering the switch
too based on your possible use of a relay.
Ralph
RV6A N822AR (at) N06 3.7 hrs....
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recapen(at)earthlink.net
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| Posted: Fri Feb 13, 2009 6:34 am Post subject: Pitot Heat |
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My concern exactly - I have a similar setup.....
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nuckolls.bob(at)aeroelect
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| Posted: Sat Feb 14, 2009 5:06 am Post subject: Pitot Heat |
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At 07:39 AM 2/13/2009, you wrote:
| Quote: | Thanks Ralph -
At the moment, it's wired with a fuse and a simple S700-1-2 Carling switch.
It'll work, but I'm concerned about running that much current thru this
switch.
Neal
I have a fuse on mine - 30 I think....looks like you're considering
the switch
too based on your possible use of a relay.
|
Yeah, I think I'd go for a relay (not unlike the S704-1)
http://aeroelectric.com/Pictures/Relays/s704-1l.jpg
fed from through one of the industry's more robust
fuses. Perhaps
http://aeroelectric.com/Pictures/Fuses/Fuses/maxi.gif
and
http://aeroelectric.com/Pictures/Fuses/Fuse_Holders/MaxiFuse_Holder.jpg
Alternatively, we'll be cutting Delrin stock
up Monday to fabricate a line of mini-ANL like
fuse blocks that are about 40% hte size and
weight of
http://aeroelectric.com/Pictures/Fuses/Fuse_Holders/MaxiFuse_Holder.jpg
and use fuses like
http://aeroelectric.com/Pictures/Fuses/Fuses/ABI_fuses.jpg
or
http://aeroelectric.com/Pictures/Fuses/Fuses/all_mega.JPG
The relay would be wired like a battery contactor . . .
you ground the free end of the coil to energize the
relay.
Finally, I'd consider a pitot heater current
sensor that lights an indicator showing that
pitot heater is indeed drawing current.
See:
http://www.aeroelectric.com/articles/Failure_Detection_and_Annunciation.pdf
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
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