Fantastic Fan thermostat? - Fiberglass RV


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Old 05-13-2020, 08:32 AM   #1
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Name: andrew
Trailer: In the Market
British Columbia
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Fantastic Fan thermostat?

I am looking at my power needs for my system and it would seem beneficial to have the FF thermostatically controlled. I have the model without a built in thermostat.

It is easy enough to find the wires going to the fan, intercept and install a thermostat. Then you would leave the fan onto the setting that you want and the thermostat would turn it on/off as needed. Would want a decent thermostat, ideally with adjustable dead band to limit cycling. Would likely install a bypass switch so can not use the stat if desired also.

See any issues with this concept? I dont think there are any fancy electronics that would be harmed, it would be similar to the switch activating to run. It however would have many more on/off cycles which may add wear.
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Old 05-13-2020, 09:33 AM   #2
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Name: Gordon
Trailer: 2015 Scamp (16 Std Layout 4) with '15 Toyota Sienna LE Tug
North Carolina
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My mod was to replace the three speed resister switch with a PWM controller. Now I have infinite speed control to zero to max fan motor RPM. I had to buy a second controller s the first one from China would not run the fan when the temp in the camper got much about 95 f or so. What do you expect for well under $10.
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Old 05-13-2020, 01:06 PM   #3
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Name: andrew
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nice mod gordon2

are there any issues at the bottom end speed range?
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Old 05-13-2020, 04:42 PM   #4
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Name: Gordon
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Quote:
Originally Posted by kipper View Post
nice mod gordon2

are there any issues at the bottom end speed range?
Maybe eventually but so far, no problems for me. I've run it a good bit slower than the original low speed while sleeping. Of course I have no specs on the fan motor so don't know if there is a minimum recommended speed. It will go slow enough that no air is moved but running it at a speed where even a very minimal amount or air flow occurs I think will not hurt the fan motor.

Demo video:
https://youtu.be/NMGRQJaC_ik
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Old 05-14-2020, 07:51 PM   #5
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Name: andrew
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nice vid, looks pretty sweet!

I might give it a try at some point... any details on the PWM used?
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Old 05-15-2020, 06:45 AM   #6
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Name: Gordon
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Quote:
Originally Posted by kipper View Post
nice vid, looks pretty sweet!

I might give it a try at some point... any details on the PWM used?
Just one from China (eBay) which is rated to handle the amps.

For mod details try google.. lots of people have documented the mod.
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Old 05-15-2020, 06:53 AM   #7
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Name: andrew
Trailer: In the Market
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Thanks! seems like a cheaper alternative to the thermostat idea and I dont want to hear it coming on/off all night. Would much prefer to run it at a low speed all night, and keep the power consumption to the minimum
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Old 05-15-2020, 02:22 PM   #8
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Name: andrew
Trailer: In the Market
British Columbia
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Found this thread online:

https://tab-rv.vanillacommunity.com/...n-mod-10-bucks

which does exactly as you have Gordon2 and the link to the PWM appears to be an active link still to amazon

I think this mod is coming to an RV near me... not much to lose. Love getting the power draw down to 0.5A = smaller battery required for my multi-day adventure plans.
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Old 05-20-2020, 01:35 PM   #9
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Name: Todd
Trailer: Scamp
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I did this. Before I had the fan, I’d replaced the furnace thermostat with the digital programmable one from my house (house got upgraded). When I installed the fan I ran the power input to a 12v relay, and the A/C side of the thermostat. Works great. Now it controls the furnace and the fan. I just want it to turn the fan off if/when it gets cold at night without having to get out of bed.
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