I tried the hunter to replace my duotherm and got everything to work except for my furnace, I took it to a garage and they could not get the hunter 42999b to work either, what they found was the thermostat was not sending 12V to furnace and no way this would work. Are there any non programmable thermostats I can use to replace the Duotherm with hi/low fan that would send 12V to the furnace?
What DuoTherm thermostat are you replacing? On the old standard analog, the furnace does not hook to the thermostat, it hooks to the air conditioner, and the thermostat tells the circuit board in the air conditioner to turn on the furnace.
This is what I have, I spent hours trying to get the furnace to work then I took the trailer to garage and for $75.00 they told me that the furnace needs 12V to work:
Models 39115.601, 39115.602, 39115.616 & 39115.626
The thermostat is a 12V DC controlled system and is a
bimetal type. It has three (3) switches on the face of the
thermostat. On the left side there is a SYSTEM switch and
on the right side there are two FAN switches. The top switch
is for HI or LOW FAN and the bottom one is for ON or
AUTO. This thermostat will operate and air conditioner and
I installed a Honeywell P/N RTH111. In my instalation I ran Black wire(fan low) to the G terminal. Blue wire(fan high) to a switch than connecting to the same terminal the the black is on. Yellow wire (compresser-cool) to the y terminal. White wire (furnace) to a single terminal screw RH. Red wire is blocked off. System is powered by the AA battery. Green wires (ground) goes to the terminal that has a jumper on RH to RC. Hope this might help you. Gary
At least you are lucky, as you can do this Mod. We can't. As our Motorhome has a Pulse-Air_System, that controls the two A/C's in our Motorhome.
We have a 5.5 Generator, which is more than enough power to run our 13,500 BTU A/C and our 11.000 BTU A/C at the same time. But with a "Pulse-Air-System, you can only run one A/C at a time.
With the Pluse-Air-System, it lets you run the Front A/C for 10 minutes then automatically switches to the Rear A/C and runs for 7 minutes. According to the Manufactor, this is the cheapset way to run two A/C's.
So the only choices we have is to either run just the Front A/C, or the Rear A/C, or to run the "Pulse-Air-System", and have the Front and Rear A/C keep switching back and forth.
On Shore Power, we can only run the Front A/C, Period. No other Choices.
Hope you get it figured out. Good Luck. Happy Travels. Dan & Jill
I looked everywhere for clarification on this mod
All the tips have RW + RC jumpered with a "BLACK OR GREEN" wire ground going to them....that didn't make any sense electronically to me so I put together a schematic diagram and just installed the mod last night...it works perfectly in cool, heat, fan speeds, everything.
RC and RW are unjumpered in mine since each could theoretically have a different power source, otherwise you could be working on one alone and the darn thing energize on you from the other units power source.