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I'm trying to wire up a honeywell programmable thermostat. model #RTH2310 with a 5-wire board. My mobile home has a Coleman Presidential II furnace/AC unit. The existing thermostat is a 24V 2-wire system. It works fine, I just want to be able to program the thermostat.
I have wire Rh and W coming from the furnace to the old thermostat. I tried to hook these up to the digital thermostat by placing the same wires in their respective slots. On the new thermostat my options are Rh\Rc\W\Y\G. Rh and Rc have a jumper which the instructions say to keep in place for the kind of furnace/AC unit that I have. When the digital thermostat was hooked up it only ran the AC continuously. I hooked up the old thermostat and all was fine, it kicked on when needed and would shut off when needed.
I talked to a few people that may or may not have more knowledge about heat and air than I do and they said it sounds like I need a 3rd wire as a common. I was told to hook the third wire to a known negative 24V source at the furnace. I wasn't sure where to hook it up on the thermostat side so I went with the G slot, (G for green same as the new 3rd wire). I know I was assuming a lot and potentially could fuck something up royal but this is DIY, am I right? Anyway, this didn't work in regulating temperature would I could get the blower to shut off by switching the thermostat to heat and then the fan switch to off. The blower switch off would not work If the heat/cool switch was set on cool. Again, tinkering a little too much here but at least I had a new function. Still not regulating the temperature so I hooked up the old thermostat and capped the 3rd wire.
A little more background on the furnace/AC unit; It has a manual AC/HEAT switch on the unit itself, also has a fan AUTO/ON switch. It's old as shit too, most of the wiring diagram is faded and it's in a 1980s mobile home. There is next to nothing about the this thermostat/furnace compatibility out there on the webs and honeywell's tech line is shitty.
Anyone out there a HVAC tech? Your help would be much appreciated.
Hey can anyone please help me install my thermostat for my incubator? I finished all of the wiring, but when the heat source is suppose to turn on, it only stays on for like 10 second's, and only at a fraction of the power. (Using a light bulb and it's very you dim, not noticeable if the lights are on.) I will show pictures of the wiring and everything. I can also send a pdf of the instructions if needed.
Yeah I was fixing my friends mess. He told me not to use the yellow wires. What was happening was I was only giving mu bulb volts, no amps at all. So I rewired it and it works perfectly. Thank god since it's a 150 dollar thermostat.
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