Hunter Thermostat Install

[pwrboatfan]

I thought I would share some pictures of my latest modification. I have been meaning to get around to doing this for over a year and finally did it this weekend. I decided to go with a Hunter Model #44157 from Wally World. It was $24.00 bucks. I waved back and forth on getting a programmable one and the non-programmable one for a few bucks less. I am glad I got the programmable one. For example, this weekend it got pretty cold (34F) at night, and I programed it to let the camper fall to 65F while we were sleeping, then at 7:30AM I had it bring the trailer back up to 70F when we got up. It worked perfect! I have a feeling this summer it will not be able to swing the AC up and down like that very quickly, but I am adding a second AC so it should do a fair job I think. I chose the Hunter over the Honeywell because I can program the span setting. Meaning the thermostat is precise to 1 degree. I can alter that to zero or 3 degrees to keep the AC from cycling on and off a bunch plus this thermostat has compressor protection that will not let it cycle on and off within 3 1/2 minutes.

I have a DuoTherm AC and Suburban Furnace.

Here is my old T-Stat wiring:


Here is the Hunter after wiring. Notice the screw holes from the old T-Stat worked for this one! No new holes in the wall!

Blue and Brown wire- G Post (This is the high low on the fan. I never use low so I wired them together for always on high. A toggle switch could be installed if you wanted to be able to switch between Hi/Low)
Green wire - RC
Yellow wire (AC) - Y Post
White wire (Furnace) - W Post
Red Wire 7.5 Volts -Not used-Double electrical taped and taped up and out of the way.


Here it is after install, leveling, and programing. I choose this one also because since it has to run on batteries, I wanted to be able to access them without having to remove it from the wall plate (ease of use for the DW)


Finished! I also chose this one because of the backlight!


All in all, it took me about 15 minutes from start to finish! I really wish I had done this install last year! I hope this helps anyone else wanting to tackle this easy and great modification!

[Wiscampsin]

Nice mod, 15 minutes and $24 well spent! Gotta agree, if you're doing it the programmable is the only way to go. I did the same in our previous hybrid and TT. I did install the hi/lo switch when I did the hybrid and found we hardly ever used the fan on low. Only a couple times when in AC mode at night. Skipped the switch when I did the mod to our TT. The Hunter Tstat makes controlling the comfort level/temp so much easier than that OEM junk.

[pwrboatfan]

Thanks! Yeah, I should have done this long ago! I am little concerned now that I have been reading the instructions and it says the system shuts off if the thermostat is under 40F and over 95F. That might be a problem when I get to the trailer in the dead of summer when it is really hot and I want to turn the AC on. The stock Dometic Digital t-stat has the same problem over 100F. I will just have to see how it works out. Still better than the stock analog one!

[GlacierGus]

Very nice mod and thanks for the pictures. I will be refering to your thread later this summer if/when I attempt the same change.

[labman1014]

Hope this isn't a hijack but can u install any digital thermostat? I can't find and of the cheap hunter or Honeywell locally. I did find a Filtrete made by 3M on sale at Home Depot for $15. It looks like it hooks up the same. Just making sure b4 I jump into the install. Tks!!

[jdadoug]

Boatman, I did the digital mod about a year ago myself......... I was in our county " Household Hazardous Waste Collection Center" and someone had turned in a HoneyWell digital thermostat. Brand New in the box!!!
I quick and grabbed it and went here and downloaded the install.
Gotta say, I like it!
I did the Hi/Lo switch on the side, went to Radio Shack and bought one and did the install.
jdadoug

[pwrboatfan]

As jdadoug did, any thermostat can be installed...as long it can be operated on battery power only.

[labman1014]

Sweet. Tks guys. I will be adding it this weekend.

[Z7xtreme]

I did the same today and used the Hunter 44155c. The only issue that I have is when I put it in auto the fan will shutdown but not the compressor. The reason I changed mine was due to the lack sorry job the old one was doing.

I haven't used the FW for awhile so the condensation started building up inside since the old Tstat wasn't working, so I cleaned the AC from one end to the other and I am still having issue and the condensation.

Bout to pull my hair out.

[itat]

Thanks for the pictures. I installed a Hunter thermostat last year and this morning it stopped working, so I really needed the first picture to re-install the original Dometic thermostat.

I'm really disappointed that the Hunter only lasted 1 year though.

I'll try a Honeywell model this time.

[08flagvlite]

I put a Honeywell on mine, too. As posted earlier, it must be battery powered, and also a SINGLE STAGE heat pump/A/C thermostat. I wired mine to high, as well. I read where the low speed is not good on the unit, and my Coleman pop up used to freeze the coils on low. Then you must shut it off to thaw out! Randy

[Brandon327]

Was this thermostat replacing a digital dometic? Mine only has 3 wires and I want to replace it.

[pwrboatfan]

No...this was an Analog thermostat.

[Road-King]

Originally Posted by Brandon327

Was this thermostat replacing a digital dometic? Mine only has 3 wires and I want to replace it.

I don't think you can do a straight swap with the 3 wire digital dometic thermostat.

[08flagvlite]

That is correct. The digital thermostat from the factory uses a different control circuit board on the ceiling control board assembly, under the cover and filter. You can call Dometic/ Duo therm, and they can tell you what you need for your application. I just changed my control board, it went bad, Randy

[jlwardn]

I did this mod as well......and actually put a spin on it as well.
I boondock in cold weather(under 45 degrees) and this thermostat only goes down to 60 degrees. I don't want the furnace running all night and killing the batteries. I altered the thermostat so that it really ignores the ambient temp and turns on and off based on time. I can have the furnace kick on at 6am and make the camper toasty warm without getting out of bed and flipping it on. I bought two of these so. Once so I can use in colder weather and and one to use the rest of the time.

[johnymoto]

i did the same mod what a good mod i whent with the non programmable one i don't need that. and has a good back light and the numbers are big so you can see them. and did the fan switch mod on the side. $27.00 mod.