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Author Topic: AC blower fan mod  (Read 226 times)

omguf

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  • Posts: 6
AC blower fan mod
« on: June 24, 2017, 01:36:31 PM »
My Airxcel 13500 ultra low profile AC in my Hummingbird only has lo and high fan settings. I've determined that allowing the blower fan to run while the AC compressor is cycled off is causing a drastic rise in humidity accompanied by mold growth at the supply vents. I'd like to possibly mod my AC to include something like an Auto/On toggle that will interrupt power to the blower motor if the AC compressor is not cycled on. Does anyone know of a way to accomplish this? As always, thanks in advance for any info you guys can provide.
2017 Jayco Hummingbird
2011 Ford Flex

catblaster

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  • Posts: 2132
Re: AC blower fan mod
« Reply #1 on: June 24, 2017, 06:42:04 PM »
   If you are talking about black deposits around the supply vents make sure it is mold instead of dirt. Turbulent air will cause a static charge that will attract dirt around a supply vent. 

   I'm sure a relay could be added that would do what you need but the AC may need to have the air circulating across an internal thermostat to get an accurate temp sample.  Just guessing at this since I have no access to a wiring  or component diagram.
Will and Jane
95 Winnebago Luxor

tncamperRVer

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  • Posts: 52
Re: AC blower fan mod
« Reply #2 on: June 24, 2017, 08:40:34 PM »
The air the fan moves when the A/C compressor is not running "should" be air from inside the RV and no outside air gets into the RV. If you have moisture issues, the A/C should remove it. If that isn't happening, then I'd see if there is a problem with a drain. Do you see water coming out anywhere when it's running?
"It ain't what you don't know that gets you into trouble. It's what you know for sure that just ain't so." - Mark Twain

NewmanRacing

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  • Posts: 37
Re: AC blower fan mod
« Reply #3 on: June 28, 2017, 08:02:50 AM »
I was considering that too. You would need some sort of a delay timer in the relay circuit so the fan runs for a short time after cycling off the compressor.

Do any RV AC rooftop units cycle off the blower fan when the compressor cycles off?
1993 Fleetwood G30 21' Jamboree
1976 Dodge Class C - Deceased
1969 Starcraft Starcruiser- Deceased

"In the land of the blind, the one-eyed man is king. "

rider1520

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  • Posts: 205
Re: AC blower fan mod
« Reply #4 on: June 28, 2017, 08:48:00 AM »
My Coleman Mach digital thermostat has the selection (auto) as an option.
2017 Winnebago Vista VE Class A 30'

omguf

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  • Posts: 6
Re: AC blower fan mod
« Reply #5 on: August 14, 2017, 09:22:49 PM »
Just to provide an update for anyone interested in this topic, I called Airxcel and spoke with one of their techs.  Apparently my model (and many of their models) accept the installation of a thermostat and control board to accomplish exactly what I was trying to do.  For my model, I needed these two parts:

AC Parts
8330-752 - control box
8330-3862 -  thermostat

They offered many different parts for their different models, so be sure you check with them (or someone who knows) about which parts you need for your model.  Thanks!!

2017 Jayco Hummingbird
2011 Ford Flex

 

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