AeroElectric-List Digest Archive

Sat 03/10/18


Total Messages Posted: 12



Today's Message Index:
----------------------
 
     1. 12:48 AM - Re: Defrost switch  (Carlos Trigo)
     2. 12:52 AM - Re: Defrost switch  (Carlos Trigo)
     3. 01:25 AM - Re: Defrost switch (BobD)
     4. 04:55 AM - Re: diy tablet efi (Harley Dixon)
     5. 04:56 AM - Re: Defrost switch  (Roger)
     6. 05:37 AM - Re: Defrost switch (Tim Olson)
     7. 05:52 AM - Re: Defrost switch (Tim Olson)
     8. 06:31 AM - Re: Defrost switch (user9253)
     9. 10:07 AM - Re: Defrost switch (Richard E. Tasker)
    10. 10:10 AM - Re: Re: Defrost switch (Richard E. Tasker)
    11. 10:13 AM - Re: Re: Defrost switch (Carlos Trigo)
    12. 07:06 PM - Re: Defrost switch (user9253)
 
 
 


Message 1


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    Time: 12:48:32 AM PST US
    From: Carlos Trigo <trigo@mail.telepac.pt>
    Subject: Re: Defrost switch
    Ren=C3=A9 I am using the 12V version of a very cheap Chinese thing called XH-W3001 I have tested it with my fingers temperature and it works very well. The only problem is that I cannot find its schematic and neither you or I ca n read the characteristics but mr. Google will show you plenty of videos in English explaining how it w orks and how you set the temperatures Cheers Carlos Enviado do meu iPhone No dia 09/03/2018, =C3-s 23:13, Rene <rene@felker.com> escreveu: > What thermostat are you using. I think I would like to do the same thing. I only have a switch and I am using Rene=99 as the thermostat. > > Rene' > 801-721-6080 > > From: owner-aeroelectric-list-server@matronics.com <owner-aeroelectric-lis t-server@matronics.com> On Behalf Of Roger > Sent: Friday, March 09, 2018 4:03 PM > To: aeroelectric-list@matronics.com > Subject: RE: AeroElectric-List: Defrost switch > > Carlos, > > Just wire the thermostat switch and the defrost switch in parallel. When t he electronics temperature is high the thermostat will turn on the fan, no m atter the position of the defrost switch. Also if you turn on the defrost s witch the fan will stay on until you turn it off. If you have two switches i n parallel, either one or both on will power up the fan. > > Roger > > Sent from Mail for Windows 10 > > From: Carlos Trigo > Sent: Friday, March 9, 2018 5:52 PM > To: aeroelectric-list@matronics.com > Subject: AeroElectric-List: Defrost switch > pt> > > In my RV-10 I installed 2 (computer type) cooler fans in the dashboard, wi th the main purpose of cooling the atmosphere behind the instrument panel to keep all the panel electronics happy. > Those 2 fans get power through a thermostat, whose temperatures (to turn t he fans on and off) can be set. > > Further to this electronics cooling function, and copying other fellow bui lders idea, this fans may also be used to defrost the windshield interior su rface. > But for this defrost function, I want to be able to turn On the fans indep endently of the thermostat, so I decided to put a switch for this. > > Now comes the question: how do I wire this switch in relation with the the rmostat circuit? > Do I have to use a diode? > > Thanks in advance > Carlos > > > > > >


    Message 2


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    Time: 12:52:45 AM PST US
    From: Carlos Trigo <trigo@mail.telepac.pt>
    Subject: Re: Defrost switch
    Roger I am using the XH-W3001 that you can see in my previous post to Ren=C3=A9. It has a small contactor (relay) which serves as the thermostat switch. Again, if I parallel the manual defrost switch with the thermostat, my fear i s what will happen when I turn on the manual switch when the thermostat cont actor is closed. Carlos Enviado do meu iPhone No dia 09/03/2018, =C3-s 23:54, Roger <rnjcurtis@charter.net> escreveu: > A simple bimetal switch is all you need as a thermostat. It consists of a bimetal strip which deforms as it is heated and closes the switch contacts. I am not aware of any thermostat that would be harmed by paralleling it wi th a switch. What thermostat are you using? > > Roger > > From: Carlos Trigo > Sent: Friday, March 9, 2018 6:27 PM > To: aeroelectric-list@matronics.com > Subject: Re: AeroElectric-List: Defrost switch > > Thanks Roger > > My only fear is (was?) that when I turn on the defrost switch, it would ru in something inside the thermostat. > > > Enviado do meu iPhone > > No dia 09/03/2018, =C3-s 23:02, Roger <rnjcurtis@charter.net> escreveu: > > Carlos, > > Just wire the thermostat switch and the defrost switch in parallel.=C3=82 When the electronics temperature is high the thermostat will turn on the fa n, no matter the position of the defrost switch.=C3=82 Also if you turn on t he defrost switch the fan will stay on until you turn it off.=C3=82 If you h ave two switches in parallel, either one or both on will power up the fan. > > Roger > > Sent from Mail for Windows 10 > > From: Carlos Trigo > Sent: Friday, March 9, 2018 5:52 PM > To: aeroelectric-list@matronics.com > Subject: AeroElectric-List: Defrost switch > pt> > > In my RV-10 I installed 2 (computer type) cooler fans in the dashboard, wi th the main purpose of cooling the atmosphere behind the instrument panel to keep all the panel electronics happy. > Those 2 fans get power through a thermostat, whose temperatures (to turn t he fans on and off) can be set. > > Further to this electronics cooling function, and copying other fellow bui lders idea, this fans may also be used to defrost the windshield interior su rface. > But for this defrost function, I want to be able to turn On the fans indep endently of the thermostat, so I decided to put a switch for this. > > Now comes the question: how do I wire this switch in relation with the the rmostat circuit? > Do I have to use a diode? > > Thanks in advance > Carlos > > > > > > >


    Message 3


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    Time: 01:25:50 AM PST US
    Subject: Re: Defrost switch
    From: "BobD" <rjd@bobdawson.plus.com>
    argoldman(at)aol.com wrote: > So the question that is begged is what will blowing ambient air on a frosted windscreen do. In your car the defrosted air is heated additionally the air conditioner compressor is activated (temperature permitting) to reduce moisture. Your body is constantly creating moisture ( primarily through respiration and sweating) this condenses on the inside of your windscreen under certain conditions. Unheated blown air will have little effect. It will have less effect on ice on the outside. Perhaps a small electric heater will help. > > Keep cool (warm) > > Rich > Rich, I hate to disagree, but I have fitted three small computer fans in the top cowling of my Europa control panel. See attached photos. I have just completed the test flying of the aircraft, and these three fans kept the pilots side of the windscreen pretty clear, while my side (passenger/observer) was constantly misted up, and I was forever having to wipe the screen to clear it. This was in February weather in the UK (i.e. cold !), so I guess body heat was causing the condensation. Those familiar with the Europa will know that the control panel only stretches to three quarters the width of the cockpit, hence I wasn't able to position a fan for the passenger side, or I would have. As my panel is fully electronic, I guess the air being blown over the windscreen is partially heated by the output from the electronics. Just as an aside, I changed the fan covers to brown (rather than white) having picked up a tip on here that using dark covers prevented/reduced reflections on the windscreen. Just my tuppence worth :D -------- Bob Dawson XS TG || 912 ULS || G-NHRJ Read this topic online here: http://forums.matronics.com/viewtopic.php?p=478542#478542 Attachments: http://forums.matronics.com//files/2017_09_04_153531_224.jpg http://forums.matronics.com//files/demisters2_554.jpg


    Message 4


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    Time: 04:55:18 AM PST US
    Subject: Re: diy tablet efi
    From: Harley Dixon <harley@AgelessWings.com>
    I have to agree with what Charlie suggested! It is EXACTLY the combination that I have for my Long EZ! Have also used the Nexus with Google Maps to guide me and my truck for long trips on the ground both here in the east and in the southern deserts of Arizona. Very happy with it. And very visible in bright daylight. Additionally, Avare can be set up to "fly" at home by reading GPS data from the X-Plane simulator (to do that, you have to install an Avare plug-in app that reads X-Plane and sends the data via Wi-Fi to Avare). During these cold winter months, I've successfully made 12 hour cross country flights with my simulated Long EZ while sitting right here next to my computer! Harley Dixon Long EZ N28EZ Canandaigua, NY ------------------------------------------------------------------------ On 3/9/2018 8:47 PM, Charlie England wrote: > If you need to keep it cheap, both the old Nexus 7 models have very > bright, hi res screens. Cheap if bought used on ebay. Avare & that SDR > ADSB receiver work great on them. > > Charlie > On Mar 9, 2018, at 4:48 PM, Bill Maxwell <wrmaxwell@bigpond.com > <mailto:wrmaxwell@bigpond.com>> wrote: > > I think the Samsung 5 phone has the better amoled screen. What > screen type does your tablet have? > > > On 9/03/2018 2:24 PM, Ernest Christley wrote: >> I spent quite a bit of time last year using a Android tablet and >> a Android phone (Samsung 5) for navigation. Granted, my canopy is >> tinted, but I never had an issue with the sun being to bright to >> use them. >> >> >> On Thursday, March 8, 2018 4:18 PM, Bill Maxwell >> <wrmaxwell@bigpond.com> wrote: >> >> >> There are a few projects that I have come across on the net, Skip >> althoughI can't find any links at the the moment. One problem >> with the pad based approach though is the visibility of the TFT >> screen in bright sunlight. The tablets using oled (also known as >> amoled) TFT s displays are the best in this regard but not many >> manufacturers are using them. Samsung were a couple of years ago >> but even they seem to have now followed the general market trend >> and discontinued them. >> >> On 9/03/2018 3:34 AM, Skip wrote: >>> Althought I was the first in town to have and build a pc, I am >>> sadly out of touch with current technology. I have been reading >>> the automotive boards, people are putting in mini computer >>> systems with a tablet monitor and running everything, even the >>> electric seats. So my question here, has anyone any information >>> on putting together an inexpensive tablet based system for >>> experimentals? I just bought a 10 inch from Walmart for $60, >>> runs android, wifi, bluetooth. >>> >>> I would think it could display a gps, engine instruments, Stormy >>> Daniels, and other stuff cheaply. >>> >>> Cell technology tablets aren't much more, that would keep it >>> connected at all times? Can you get cheap weather radar on your >>> cell phone? >>> >>> Yes, hopelessly out of date. >>> >>> Thoughts? >>> >>> >>> Skip >>> cardinalnsb@aol.com <mailto:cardinalnsb@aol.com> >>> >>> >> >> >> >


    Message 5


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    Time: 04:56:52 AM PST US
    From: Roger <rnjcurtis@charter.net>
    Subject: Defrost switch
    As noted earlier, by another poster, you can google this device and get a m anual and a youtube video. It appears that the output is not just open rel ay contacts, but it supplies power, so don=99t put a switch across it . You could take the output to a 12V relay and then use the relay contacts , parallel with a toggle switch, to turn on the fan, as I had suggested in a previous post. There are other solutions, but this is a simple addition of a relay and a switch. Roger From: Carlos Trigo Sent: Saturday, March 10, 2018 3:55 AM Subject: Re: AeroElectric-List: Defrost switch Roger I am using the XH-W3001 that you can see in my previous post to Ren=C3=A9. It has a small contactor (relay) which serves as the thermostat switch. Again, if I parallel the manual defrost switch with the thermostat, my fear is what will happen when I turn on the manual switch when the thermostat c ontactor is closed. Carlos Enviado do meu iPhone No dia 09/03/2018, =C3-s 23:54, Roger <rnjcurtis@charter.net> escreveu: A simple bimetal switch is all you need as a thermostat.=C2- It consists of a bimetal strip which deforms as it is heated and closes the switch cont acts.=C2- I am not aware of any thermostat that would be harmed by parall eling it with a switch.=C2- What thermostat are you using? =C2- Roger =C2- From: Carlos Trigo Sent: Friday, March 9, 2018 6:27 PM Subject: Re: AeroElectric-List: Defrost switch =C2- Thanks Roger =C2- My only fear is (was?) that when I turn on the defrost switch, it would rui n something inside the thermostat. =C2- Enviado do meu iPhone No dia 09/03/2018, =C3-s 23:02, Roger <rnjcurtis@charter.net> escreveu: Carlos, =C2- Just wire the thermostat switch and the defrost switch in parallel.=C3=82 =C2- When the electronics temperature is high the thermostat will turn on the fan, no matter the position of the defrost switch.=C3=82=C2- Also if you turn on the defrost switch the fan will stay on until you turn it off. =C3=82=C2- If you have two switches in parallel, either one or both on wi ll power up the fan. =C2- Roger =C2- Sent from Mail for Windows 10 =C2- From: Carlos Trigo Sent: Friday, March 9, 2018 5:52 PM Subject: AeroElectric-List: Defrost switch =C2- t> =C2- In my RV-10 I installed 2 (computer type) cooler fans in the dashboard, wit h the main purpose of cooling the atmosphere behind the instrument panel to keep all the panel electronics happy. Those 2 fans get power through a thermostat, whose temperatures (to turn th e fans on and off) can be set. =C2- Further to this electronics cooling function, and copying other fellow buil ders idea, this fans may also be used to defrost the windshield interior su rface. But for this defrost function, I want to be able to turn On the fans indepe ndently of the thermostat, so I decided to put a switch for this. =C2- Now comes the question: how do I wire this switch in relation with the ther mostat circuit? Do I have to use a diode? =C2- Thanks in advance Carlos =C2- =C2- =C2- =C2- =C2- =C2- =C2-


    Message 6


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    Time: 05:37:57 AM PST US
    From: Tim Olson <Tim@MyRV10.com>
    Subject: Re: Defrost switch
    I find no need or interest In a defrost switch or fan thermostat in my RV10. My opinion is that you will want the fan on all the time either way, so mi ne come on with the master. In the summer you=99ll want to exhaust th e heat from avionics as best you can, and in the winter you=99ll want c onstant defrost. There is no reason to even put a switch on them. I prefer t o have them come on with the master because it is the best reminder that you left the master on in the first place. On my first plane I did that. On m y second I was temporarily hit with stupidity and did not have it on the rig ht bus and ended up completely killing 2 batteries during the first year by f orgetting to turn off the master during database maintenance on the EFISs =99. Once i killed the second battery I fixed that issue and now if I forget I ha ve an audible reminder to turn off the darn switch and don=99t forget a nymore. But really, there is no time you will ever not want fans. Think about it... do you EVER want hear buildup under the panel? Even in the winter my avioni cs need cooling because it=99s well over 90F under the panel when the h eat is turned on. Keep it simple. Tim > On Mar 10, 2018, at 7:56 AM, Roger <rnjcurtis@charter.net> wrote: > > As noted earlier, by another poster, you can google this device and get a m anual and a youtube video. It appears that the output is not just open rela y contacts, but it supplies power, so don=99t put a switch across it. You could take the output to a 12V relay and then use the relay contacts, p arallel with a toggle switch, to turn on the fan, as I had suggested in a p revious post. There are other solutions, but this is a simple addition of a relay and a switch. > > Roger > > From: Carlos Trigo > Sent: Saturday, March 10, 2018 3:55 AM > To: aeroelectric-list@matronics.com > Subject: Re: AeroElectric-List: Defrost switch > > Roger > > I am using the XH-W3001 that you can see in my previous post to Ren=C3=A9. > > It has a small contactor (relay) which serves as the thermostat switch. > Again, if I parallel the manual defrost switch with the thermostat, my fea r is what will happen when I turn on the manual switch when the thermostat c ontactor is closed. > > Carlos > > Enviado do meu iPhone > > No dia 09/03/2018, =C3-s 23:54, Roger <rnjcurtis@charter.net> escreveu: > > A simple bimetal switch is all you need as a thermostat. It consists of a bimetal strip which deforms as it is heated and closes the switch contacts. I am not aware of any thermostat that would be harmed by paralleling it wi th a switch. What thermostat are you using? > > Roger > > From: Carlos Trigo > Sent: Friday, March 9, 2018 6:27 PM > To: aeroelectric-list@matronics.com > Subject: Re: AeroElectric-List: Defrost switch > > Thanks Roger > > My only fear is (was?) that when I turn on the defrost switch, it would ru in something inside the thermostat. > > > Enviado do meu iPhone > > No dia 09/03/2018, =C3-s 23:02, Roger <rnjcurtis@charter.net> escreveu: > > Carlos, > > Just wire the thermostat switch and the defrost switch in parallel.=C3=82 When the electronics temperature is high the thermostat will turn on the fa n, no matter the position of the defrost switch.=C3=82 Also if you turn on t he defrost switch the fan will stay on until you turn it off.=C3=82 If you h ave two switches in parallel, either one or both on will power up the fan. > > Roger > > Sent from Mail for Windows 10 > > From: Carlos Trigo > Sent: Friday, March 9, 2018 5:52 PM > To: aeroelectric-list@matronics.com > Subject: AeroElectric-List: Defrost switch > pt> > > In my RV-10 I installed 2 (computer type) cooler fans in the dashboard, wi th the main purpose of cooling the atmosphere behind the instrument panel to keep all the panel electronics happy. > Those 2 fans get power through a thermostat, whose temperatures (to turn t he fans on and off) can be set. > > Further to this electronics cooling function, and copying other fellow bui lders idea, this fans may also be used to defrost the windshield interior su rface. > But for this defrost function, I want to be able to turn On the fans indep endently of the thermostat, so I decided to put a switch for this. > > Now comes the question: how do I wire this switch in relation with the the rmostat circuit? > Do I have to use a diode? > > Thanks in advance > Carlos > > > > > > > >


    Message 7


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    Time: 05:52:13 AM PST US
    From: Tim Olson <Tim@MyRV10.com>
    Subject: Re: Defrost switch
    I agree Dan. In the RV10 just having two fans does fine for defrost. Flying at -10F this winter mine had no problem clearing the windshield. The side windows can be another story. My first fans were very tiny...maybe 40mm fans and weak. Those didnt work. Get some high volume 80-120mm fans and it will work well. Make sure they and the fan grills are black. I even painted or removed the fan labels because ANY light coloring will reflect on the windscreen. Tim > On Mar 10, 2018, at 12:06 AM, Dan Charrois <dan@syz.com> wrote: > > > At the other end of the spectrum, I live in Canada, and did several flights this winter with temperatures in the -25C to -30C range. I have the same configuration - just a couple of computer fans mounted in the glare shield, whose purpose is to blow air from behind the instrument panel, where the air is heated from the instruments and cabin heat output by the feet. > > I can say that at least in my case, it's worked perfectly. If the cabin is kept reasonably warm through cabin heat, which is what you'd want to do anyway, it doesn't have any problem keeping the windshield clear in my RV10. The only case where heated blown air might have helped is during runup and initial taxi before the engine has gotten warm enough to heat things up sufficiently. But when underway, the windshield has remained perfectly clear (not the same to be said of the side windows that didn't have the fans blowing on them - they tend to get quite icy in those conditions). > > One thing working in my favour is our winters are typically exceptionally dry, so the humidity of the air is very low - with the exception of the humidity generated by the occupants. > > Dan > >> On 2018-Mar-09, at 7:05 PM, Rene Felker <rene@felker.com> wrote: >> >> The air is heated by the electronics, the cabin heater, and the RV-10 tunnel heat. Worked every time I needed it..but I do live in a desert >> >> From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of A R Goldman >> Sent: Friday, March 9, 2018 5:01 PM >> To: aeroelectric-list@matronics.com >> Subject: Re: AeroElectric-List: Defrost switch >> >> So the question that is begged is what will blowing ambient air on a frosted windscreen do. In your car the defrosted air is heated additionally the air conditioner compressor is activated (temperature permitting) to reduce moisture. Your body is constantly creating moisture ( primarily through respiration and sweating) this condenses on the inside of your windscreen under certain conditions. Unheated blown air will have little effect. It will have less effect on ice on the outside. Perhaps a small electric heater will help. >> >> Keep cool (warm) >> >> Rich >> >> Sent from my iPhone >> >>> On Mar 9, 2018, at 5:24 PM, Carlos Trigo <trigo@mail.telepac.pt> wrote: >>> >>> Thanks Roger >>> >>> My only fear is (was?) that when I turn on the defrost switch, it would ruin something inside the thermostat. >>> >>> >>> Enviado do meu iPhone >>> >>> No dia 09/03/2018, s 23:02, Roger <rnjcurtis@charter.net> escreveu: >>> >>>> Carlos, >>>> >>>> Just wire the thermostat switch and the defrost switch in parallel. When the electronics temperature is high the thermostat will turn on the fan, no matter the position of the defrost switch. Also if you turn on the defrost switch the fan will stay on until you turn it off. If you have two switches in parallel, either one or both on will power up the fan. >>>> >>>> Roger >>>> >>>> Sent from Mail for Windows 10 >>>> >>>> From: Carlos Trigo >>>> Sent: Friday, March 9, 2018 5:52 PM >>>> To: aeroelectric-list@matronics.com >>>> Subject: AeroElectric-List: Defrost switch >>>> >>>> >>>> In my RV-10 I installed 2 (computer type) cooler fans in the dashboard, with the main purpose of cooling the atmosphere behind the instrument panel to keep all the panel electronics happy. >>>> Those 2 fans get power through a thermostat, whose temperatures (to turn the fans on and off) can be set. >>>> >>>> Further to this electronics cooling function, and copying other fellow builders idea, this fans may also be used to defrost the windshield interior surface. >>>> But for this defrost function, I want to be able to turn On the fans independently of the thermostat, so I decided to put a switch for this. >>>> >>>> Now comes the question: how do I wire this switch in relation with the thermostat circuit? >>>> Do I have to use a diode? >>>> >>>> Thanks in advance >>>> Carlos >>>> >>>> >>>> >>>> >>>> >>>> > > --- > Dan Charrois > President, Syzygy Research & Technology > Phone: 780-961-2213 > > > > >


    Message 8


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    Time: 06:31:10 AM PST US
    Subject: Re: Defrost switch
    From: "user9253" <fransew@gmail.com>
    Carlos, Others have made a good point about leaving the fans run continuously. But if you want them switched, it should be safe to connect a switch in parallel with the relay contacts that are internal to the temperature controller. -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=478551#478551


    Message 9


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    Time: 10:07:58 AM PST US
    Subject: Re: Defrost switch
    From: "Richard E. Tasker" <retasker@optonline.net>
    So use a DPDT switch. Connect the two heater wires heater to the common contacts, the manual side contacts to +12V and ground and the other side to the two thermostat output wires. If you have it on the manual setting you don't care what the thermostat wants and it's output is isolated. Setting it to the other side lets the thermostat control the heater . Dick Tasker Carlos Trigo wrote: > Roger > > I am using the XH-W3001 that you can see in my previous post to Ren. > > It has a small contactor (relay) which serves as the thermostat switch. > Again, if I parallel the manual defrost switch with the thermostat, my fear is what will happen when I turn on the manual switch when the thermostat contactor is closed. > > Carlos > > Enviado do meu iPhone > > No dia 09/03/2018, s 23:54, Roger <rnjcurtis@charter.net <mailto:rnjcurtis@charter.net>> escreveu: > >> A simple bimetal switch is all you need as a thermostat. It consists of a bimetal strip which deforms as it is heated and closes the switch contacts. I am not aware of any thermostat that would >> be harmed by paralleling it with a switch. What thermostat are you using? >> >> Roger >> >> *From: *Carlos Trigo <mailto:trigo@mail.telepac.pt> >> *Sent: *Friday, March 9, 2018 6:27 PM >> *To: *aeroelectric-list@matronics.com <mailto:aeroelectric-list@matronics.com> >> *Subject: *Re: AeroElectric-List: Defrost switch >> >> Thanks Roger >> >> My only fear is (was?) that when I turn on the defrost switch, it would ruin something inside the thermostat. >> >> Enviado do meu iPhone >> >> >> No dia 09/03/2018, s 23:02, Roger <rnjcurtis@charter.net <mailto:rnjcurtis@charter.net>> escreveu: >> >> Carlos, >> >> Just wire the thermostat switch and the defrost switch in parallel. When the electronics temperature is high the thermostat will turn on the fan, no matter the position of the defrost >> switch. Also if you turn on the defrost switch the fan will stay on until you turn it off. If you have two switches in parallel, either one or both on will power up the fan. >> >> Roger >> >> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10 >> >> *From: *Carlos Trigo <mailto:trigo@mail.telepac.pt> >> *Sent: *Friday, March 9, 2018 5:52 PM >> *To: *aeroelectric-list@matronics.com <mailto:aeroelectric-list@matronics.com> >> *Subject: *AeroElectric-List: Defrost switch >> >> >> In my RV-10 I installed 2 (computer type) cooler fans in the dashboard, with the main purpose of cooling the atmosphere behind the instrument panel to keep all the panel electronics happy. >> >> Those 2 fans get power through a thermostat, whose temperatures (to turn the fans on and off) can be set. >> >> Further to this electronics cooling function, and copying other fellow builders idea, this fans may also be used to defrost the windshield interior surface. >> >> But for this defrost function, I want to be able to turn On the fans independently of the thermostat, so I decided to put a switch for this. >> >> Now comes the question: how do I wire this switch in relation with the thermostat circuit? >> >> Do I have to use a diode? >> >> Thanks in advance >> >> Carlos >>


    Message 10


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    Time: 10:10:09 AM PST US
    Subject: Re: Defrost switch
    From: "Richard E. Tasker" <retasker@optonline.net>
    The manual that you can access on Google specifically warns against this. See my previous email. Dick Tasker user9253 wrote: > > Carlos, > Others have made a good point about leaving the fans run continuously. But if you want them switched, it should be safe to connect a switch in parallel with the relay contacts that are internal to the temperature controller. > > -------- > Joe Gores > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=478551#478551 > >


    Message 11


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    Time: 10:13:15 AM PST US
    From: Carlos Trigo <trigo@mail.telepac.pt>
    Subject: Re: Defrost switch
    Its exactly that Joe You covered my sudden access of stupidity... Thanks Carlos Enviado do meu iPhone No dia 10/03/2018, s 14:30, user9253 <fransew@gmail.com> escreveu: > > Carlos, > Others have made a good point about leaving the fans run continuously. But if you want them switched, it should be safe to connect a switch in parallel with the relay contacts that are internal to the temperature controller. > > -------- > Joe Gores > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=478551#478551 > > > > > > > > >


    Message 12


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    Time: 07:06:32 PM PST US
    Subject: Re: Defrost switch
    From: "user9253" <fransew@gmail.com>
    Dick Tasker, right you are. The manual warns against connecting power to the temperature controller output. At least I think it says that. It is hard to read Chinese. LOL Without having the controller circuit board in hand along with a schematic, an informed decision can not be made. Dick's suggestion about using a double pole double throw (DPDT) switch is the safe way to wire it. -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=478572#478572




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