revump wrote: What happens if you leave the fan switch on low and the AC comes on?
The AC then starts and runs on low.
If your concern is the coil freezing up due to the rumor that these roof-airs can't be run on low fan speed, I have NEVER had on-going issues with a iced evap coil. I say on-going because I serviced the unit and it never iced again.
If your roof-air has clean coils, the proper sealing between intake and return sections and the proper refrigerant charge, the unit will not ice-up on low speed.
The one I had ice up was due to the freeze sensor falling off of the evaporator coil mount.
I have been running my current Dometic 15k on low speed for years and it doesn't ice up even with 105 degree days here.
Steve
2007 Springdale 291RKL
2003 F150 King Ranch
2001 Dodge Van w/Wheelchair Ramp
1991 Palomino Mustang PUP
Eureka Timberline Tent
Yamaha IF2400isc
Yamaha EF3000iSEBC "Politically Incorrect And Proud Of It"
I was wondering, you need the fan switch for just the heat, right? So, if you wire a seperate switch (like above) you wire it in for "low" and just turn it on when using the heat?
Jim
2007 29' Maverick 292 DS
A 12 yr. old long haired Doxie, "Digger"..
I was wondering, you need the fan switch for just the heat, right? So, if you wire a seperate switch (like above) you wire it in for "low" and just turn it on when using the heat?
Jim
The furnace that is controled from the thermostat is only a single speed and the fan switch used in the digital stat conversion only affects the roof-air.
If you are talking about "the heat" from the roof-air in the form of a heat-pump then that is another issue.
revump wrote: What happens if you leave the fan switch on low and the AC comes on?
Less air will be moved than when it is on high, just the same as it is with your current t-stat. It will still work, but the air coming from the vents will not be as forceful.
The AC then starts and runs on low. 
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