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Old 07-22-2021, 11:54 AM   #1
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Disable fantastic fan rain sensor

If we are boondocking, or harvest hosting, and want our fans on, any ideas how to keep them on. Sleeping at night, they turn off as the dew settles on them.
Can we disable the rain sensors? if so, how?

Thanks!
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Old 07-22-2021, 12:02 PM   #2
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They sell vent covers that mount on top of your Fantastic Fan that will generally allow provide for fan functionality in any reasonable weather. Here is an example of one, although I have no idea is this is the size to fit your particular fan.
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Old 07-22-2021, 12:10 PM   #3
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I've considered this too and jaybouman's cover idea is probably a much better plan.

I'd expect the first time camping with unexpected rains that leave the fantastic fans open will be the last time to think it would be a good idea to disable the rain sensors.
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Old 07-22-2021, 01:03 PM   #4
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Used the fans with the rain sensor for years. Finally put the fantastic fan cover over them. Best thing I have done for a while. Cover mounts using the fan mounting screws. Easy.
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Old 07-22-2021, 01:23 PM   #5
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Quote:
Originally Posted by jaybauman View Post
They sell vent covers that mount on top of your Fantastic Fan that will generally allow provide for fan functionality in any reasonable weather.
...but it's ugly! Especially on older trailers that aren't as tall. We live with the sensor shutting the cover in the morning dew or leave the vent open, but the fan off. But then our trailer has LOTS of windows we can leave open for additional air flow (no A/C).

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Old 07-22-2021, 01:31 PM   #6
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Originally Posted by InsideOut View Post
...but it's ugly! Especially on older trailers that aren't as tall. We live with the sensor shutting the cover in the morning dew or leave the vent open, but the fan off. But then our trailer has LOTS of windows we can leave open for additional air flow (no A/C).

Shari

For the record, I agree with you Shari. My fans are naked.
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Old 07-22-2021, 01:37 PM   #7
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Disconnecting rain sensor

It's easy. Remove the 2 screws holding the manual crank over ride. Remove the 3 screws holding fan base up onto the mounting bracket. Carefully pull fan assembly down until you can see the wires from the little rain sensor up by lid. Follow the 2 wires back to the motherboard and using needle nose pliers gently unplug them. Reassemble. Should take maybe 10 minutes tops.

On both of our AS I added the "Fantastic Fan Ultrabreeze Covers" to both fans in addition to disconnecting that awful PITA rain sensor.
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Old 07-22-2021, 01:47 PM   #8
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That is exactly why the first mod I do is to replace the FFs with MaxxAir fans. More efficient, work in the rain, multiple speeds.
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Old 07-23-2021, 11:01 AM   #9
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thanks all!
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Old 07-23-2021, 11:05 AM   #10
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Back to the initial question. Does anyone know how to disconnect the rain sensor. I installed covers on my two fans but one of them still shuts off and closes when it rains. Obviously a little moisture is getting to the sensor. So, does anyone know how to disconnect?
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Old 07-23-2021, 12:17 PM   #11
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Originally Posted by Airdream99 View Post
Back to the initial question. Does anyone know how to disconnect the rain sensor. I installed covers on my two fans but one of them still shuts off and closes when it rains. Obviously a little moisture is getting to the sensor. So, does anyone know how to disconnect?

Unplug the black ( I think it was black)wire running from the rain sensor to the board. Click image for larger version

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Old 07-23-2021, 12:33 PM   #12
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Originally Posted by Hiho Silver View Post
Unplug the black ( I think it was black)wire running from the rain sensor to the board. Attachment 400226Attachment 400227


Here is a schematic Click image for larger version

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Old 07-23-2021, 07:18 PM   #13
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We have a winner!

Quote:
Originally Posted by Wayne&Sam View Post
That is exactly why the first mod I do is to replace the FFs with MaxxAir fans. More efficient, work in the rain, multiple speeds.
^that’s my answer

Also in the “wise guy” category… you can leave the trailer parked near the ocean with the fans as ventilation. In about a year the rain sensors will corrode and stop working. You won’t know this has happened, but it is guaranteed to happen in monsoon season. It’s governed by the same law of physics that ensures that buttered toast lands butter side down. After two cycles of replacing rain sensors and mopping up rain water that poured through the open hatch which you thought closed itself you will switch to MaxxAir fans.
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Old 07-23-2021, 08:05 PM   #14
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Maybe I'm missing something. The fan has a sensitivity setting and an on/off switch. I leave the switch in the off position and the "auto-close" is not an issue.

Making sure the fan lid is closed is part of our mental checklist whenever we go out. That includes turning off most/all lights, turning off the water heater, closing windows and rolling up awnings.

Seems like actively taking apart the fan components is overkill.
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Old 07-23-2021, 10:00 PM   #15
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Rain sensor switch

I unplugged the white connector to the green circuit board, drilled out the embossed area visible near the speed switch on the top side of the panel and installed a mini switch. I cut one of the two black wires from the rain sensor board to the small white plug, spliced the red and black wires of the mini switch into that one black wire. I was gone this week, we had rain while gone and the fan was still running when I got back. Take into consideration that I have a Fantastic Vent Fan smoked cover over this fan and the cover that comes with the fan usually closes under heavy rain and will not reopen automatically like my front Fantastic Fan does. I have been waiting to test the mini switch to see which switch direction completes the connection for the rain sensor to work and which prevents it from working. I may just test it tomorrow to test switch direction and to verify this modification worked. I have pictures but it will take awhile to post them.
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Old 07-24-2021, 03:39 PM   #16
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I use the covers. Just leave everything on and forget it. If it still cycles place the in/out switch to neutral. No fans, but it won't cycle. That is the way I leave them in storage.
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Old 08-01-2021, 09:58 AM   #17
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Our fans (2) have a manual operation option - I just assumed if my does they all do????
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Old 08-01-2021, 01:25 PM   #18
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Quote:
Originally Posted by Tomfeury View Post
If we are boondocking, or harvest hosting, and want our fans on, any ideas how to keep them on. Sleeping at night, they turn off as the dew settles on them.
Can we disable the rain sensors? if so, how?

Thanks!
First close the lid with using the small open/close switch. Pull the “Auto” “ Manual” knob down to Manual. Operate the lid with that knob. All features work as in Auto except rain sensor has no control of the lid-you do.
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Old 08-01-2021, 01:48 PM   #19
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Rain sensor switch success

We had a heavy rain storm last night with high winds. We had a phone alert and I remembered that my car windows were down an inch so I ran out to run them up. Rain was starting to come down and I got a little wet. This morning I went out to the Airstream and fans were running so the rain sensor operation was negated by my previous post about switch install. I moved the switch to the other position and will mist the rain sensor board to see if that position closes the dome. I still have been unable to post a picture, frustrating.
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Old 08-01-2021, 03:19 PM   #20
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Why permanently?

I keep the sensor clean & working with green scotch pads and have disabled the sensor with packaging tape when nature overpowered it.
KISS...keep it stupid simple.

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