Today's Message Index:
----------------------
1. 09:54 AM - Re: heater fan wiring (Ken Ryan)
2. 01:08 PM - Re: Re: heater fan wiring (Stephen Richards)
3. 01:29 PM - Re: ASX-1 Supply (Robert L. Nuckolls, III)
4. 01:35 PM - Re: Re: heater fan wiring (Charlie England)
5. 03:17 PM - Re: Re: heater fan wiring ()
6. 05:27 PM - Re: heater fan wiring (Robert L. Nuckolls, III)
7. 05:27 PM - Re: Re: heater fan wiring (Robert L. Nuckolls, III)
8. 05:50 PM - Re: Re: heater fan wiring (Ken Ryan)
Message 1
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Subject: | Re: heater fan wiring |
Thanks Charlie. If I ever start blowing fuses I will try these. Good to
know that they exist.
Sent from my Android. Sorry Steve.
On Mar 28, 2017 2:10 PM, "Charlie England" <ceengland7@gmail.com> wrote:
> ceengland7@gmail.com>
>
> On 3/28/2017 2:49 PM, Ken Ryan wrote:
>
>> I am building a cabin heater (Rotax) and the fan draws 4.3 amps. I have
>> read that on startup it can draw 12 amps. It is a permanent magnet type
>> fan. It looks like a large computer fan on steroids.
>>
>> I have decided to use my "defrost" circuit, which was originally going to
>> power a couple of small, low draw computer fans. I wired it with 20 AWG
>> wire.
>>
>> I would like to use the existing wiring for the fan, but I might need to
>> put in a 12 amp fuse, and am a little concerned that might be too much for
>> the 20 AWG wire.
>>
>> The wire from the bus to the switch is about 18 inches and the wire from
>> the switch to the fan is about 24 inches.
>>
>> I guess I have two questions:
>>
>> 1. What would be the largest fuse I could use and still be safe?
>>
>> 2. If I test it and it doesn't blow a 5 amp (or 7.5 amp) fuse, do you
>> think it would be likely to continue working indefinitely?
>>
>> Thanks,
>>
>> Ken
>>
> Somebody on another forum recently posted a link to Cooper Bussman ATC
> format circuit breakers. The time-to-trip vs overload percentage looks a
> lot like traditional circuit breakers, instead of the near-instant trip of
> an ATC fuse. Might be worth a look. The longer time constant should allow
> for momentary startup loads.
> http://www.cooperindustries.com/content/dam/public/bussmann/
> Transportation/Resources/catalog_pages/BUS_Tns_227_ATC_CB.pdf
>
> http://www.cooperindustries.com/content/dam/public/bussmann/
> Transportation/Resources/catalog_pages/circuit-
> protection/bus-cbt-ds-series-22x-circuit-breakers.pdf
>
> That's a really sturdy looking fan box. :-) What's it weigh?
>
> Charlie
>
>
Message 2
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Subject: | Re: heater fan wiring |
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Message 3
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Subject: | Re: ASX-1 Supply |
At 12:36 AM 3/28/2017, you wrote:
>
>Fail to understand why the SPDT solution isn't much better. It
>eliminates two components, lets you test the battery supply anytime
>and allows power to the ASX-1 to be shut off (presumably only for
>maintenance). Or with a DPDT switch one could use the second pole
>to take power from the 3a fuse and light a big LED warning if the
>switch is in the battery position. Granted, there is a new single
>point of failure but don't see how failure of the ASX-1 prevents
>completion of the flight as planned.
>
>Tom
Tom's comments planted seeds of a new idea which
I massaged for several house on the "asphalt drafting
board" yesterday driving to Wichita.
I'll offer this configuration which I am considering
as a new z-figure to the 'Connection . . .
Emacs!
This idea adds a warning light for standby battery
switch position. This would reduce probability for
inadvertent depletion of the battery. I've also
added a fuse to the battery pack which is advised
especially when the appliance teamed with design goals
call for up-sizing the stand-by cells.
Let's digest this configuration for awhile . . .
Hat tip to Tom K!
Bob . . .
Message 4
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Subject: | Re: heater fan wiring |
Also, try SteinAir. They sell one that's supposed to be noise free.
On 3/29/2017 2:57 PM, Stephen Richards wrote:
> Bernie Not sure why you have put a question about USB chargers under
> this thread but I understand Anker products are noise free I have used
> a USB power drive 2 and can hold a hand held radio near this with no
> problem
> Clive
> ------------------------------------------------------------------------
> From: Bernie Willis <mailto:arcticarrow@gmail.com>
> Sent: 29/03/2017 02:09
> To: aeroelectric-list@matronics.com
> <mailto:aeroelectric-list@matronics.com>
> Subject: Re: AeroElectric-List: Re: heater fan wiring
>
> <arcticarrow@gmail.com>
>
> This question is about USB charging ports and radio interference/noise.
> Ive check out a couple charging ports that plug into the cigarette
> lighter and they both produce noise when charging. Both purchased from
> pilot shops. Also tried a couple direct wire USB charging ports from
> marine/auto applications with the same result. Is there any way to
> filter or shield these devices to reduce or eliminate the radio
> noise. The noise cant be eliminated with squelch adjustment. Im
> using a hand held icom radio for the test, it doesnt see to make any
> difference if the radio is 12 to 36 away from the charging port.
>
> Thanks,
> Bernie
> > On Mar 28, 2017, at 4:01 PM, user9253 <fransew@gmail.com> wrote:
> >
> >
> > Ken, Some fan speed controllers put out a steady DC for several
> milliseconds to start a motor, then change over to PWM. The motor
> might very well draw 12 amps to start, but only for a fraction of a
> second, too short of a time to heat up and blow a fuse. It looks like
> you have answered your own question by testing. As long as it works,
> it is good enough.
> > Thanks for those links Charlie. I never knew ATC circuit breakers
> existed.
> >
> > --------
> > Joe Gores
> >
> >
> >
> >
> > Read this topic online here:
> >
> > http://forums.matronics.com/viewtopic.php?p=467771#467771
> >
> >
> >
> sp; - MATRONICS WEB F - NEW MATRONICS LIST WIKI -
> _= p; &======
>
>
Message 5
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Subject: | Re: heater fan wiring |
+1 on the Anker "aux port" chargers. They also make great USB and
Lightning cables, including 6-foot lengths.
Jim Parker
-------- Original Message --------
Subject: RE: AeroElectric-List: Re: heater fan wiring
From: Stephen Richards <stephencliverichards@gmail.com>
Bernie Not sure why you have put a question about USB chargers under
this thread but I understand Anker products are noise free I have used a
USB power drive 2 and can hold a hand held radio near this with no
problem
Clive
From: Bernie Willis
Sent: 29/03/2017 02:09
Subject: Re: AeroElectric-List: Re: heater fan wiring
<arcticarrow@gmail.com>
This question is about USB charging ports and radio interference/noise.
Ive check out a couple charging ports that plug into the cigarette
lighter and they both produce noise when charging. Both purchased from
pilot shops. Also tried a couple direct wire USB charging ports from
marine/auto applications with the same result. Is there any way to
filter or shield these devices to reduce or eliminate the radio noise.
The noise cant be eliminated with squelch adjustment. Im using a
hand held icom radio for the test, it doesnt see to make any
difference if the radio is 12 to 36 away from the charging port.
Thanks,
Bernie
> On Mar 28, 2017, at 4:01 PM, user9253 <fransew@gmail.com> wrote:
>
>
> Ken, Some fan speed controllers put out a steady DC for several milliseconds
to start a motor, then change over to PWM. The motor might very well draw 12
amps to start, but only for a fraction of a second, too short of a time to heat
up and blow a fuse. It looks like you have answered your own question by testing.
As long as it works, it is good enough.
> Thanks for those links Charlie. I never knew ATC circuit breakers existed.
>
> --------
> Joe Gores
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=467771#467771
>
>
>
sp; - MATRONICS WEB F - NEW MATRONICS LIST WIKI -
_= p; &======
Message 6
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Subject: | Re: heater fan wiring |
At 02:49 PM 3/28/2017, you wrote:
>I am building a cabin heater (Rotax) and the fan draws 4.3 amps. I
>have read that on startup it can draw 12 amps.
This will be for milliseconds during spin-up . . . leave
the 20AWG in place and go with 10A fuse . . . it's probably
going to be fine.
Bob . . .
Message 7
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Subject: | Re: heater fan wiring |
At 04:12 PM 3/28/2017, you wrote:
>
>I would try a 7.5 amp fuse. I usually prefer fuses. But for a motor,
> a circuit breaker will not nuisance trip as easily. Some day the motor
> bearings will freeze up. If fused higher and the motor draws 12
> amps continuously,
> the wire will then get hot enough to boil water.
Actually, 20AWG is pretty 'cool' at 12A. See
http://tinyurl.com/lk2tmhx
If a 22AWG at 20A just barely passes 100C in free
air . . . a 20AWG at 12A is pretty safe.
A 10A fuse would be fine . . .
Bob . . .
Message 8
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Subject: | Re: heater fan wiring |
Great! Thanks.
Sent from my Android. Sorry Steve.
On Mar 29, 2017 4:35 PM, "Robert L. Nuckolls, III" <
nuckolls.bob@aeroelectric.com> wrote:
> At 04:12 PM 3/28/2017, you wrote:
>
>
> I would try a 7.5 amp fuse. I usually prefer fuses. But for a motor,
> a circuit breaker will not nuisance trip as easily. Some day the motor
> bearings will freeze up. If fused higher and the motor draws 12 amps
> continuously,
> the wire will then get hot enough to boil water.
>
>
> Actually, 20AWG is pretty 'cool' at 12A. See
>
> http://tinyurl.com/lk2tmhx
>
> If a 22AWG at 20A just barely passes 100C in free
> air . . . a 20AWG at 12A is pretty safe.
>
> A 10A fuse would be fine . . .
>
> Bob . . .
>
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