Dometic digital thermostat to Honeywell
Hey, Has anyone had any luck swapping out a dometic digital thermostat(3-wire) for a honeywell or any other brand? Seem dometic introduced a digital interface for controlling a/c and furnace. I a...
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Three wires? Can you describe what they do or maybe what color each is?
It's quite likely that you can install a Honeywell thermostat. The 3000 series and 5000 series (and maybe others) non-programable units should be fine. They all have internal battery power (2 AA batteries). There are many other brands that are similar.
The only thing any thermostat does is close a switch at the right temperature. Electronic thermostats do that with relays instead of mechanical switches. The only thing special about RV digital thermostats is that they operate on 12vdc instead of 24vac like home thermostats use. The self-contained digital ones, like Honeywell, don't use any external power, so it doesn't matter. They use internal batteries.
You need to connect the +12v wire to the thermostat (R) terminal.
The wire to the furnace connects to the (W) terminal.
If you have a ground wire, don't use it.
If you have a fan wire, it connects to the G terminal.
If you have an A/C wire, it connects to the Y terminal.
You will also have to go through a short programming set-up.
Of course, you will have to replace the batteries regularly to prevent leakage and internal damage.
EDIT: After reading the posts below and doing a little more research, I can see that this is completely wrong. Disregard everything in this post. There IS something different about a Dometic 3-wire thermostat: a separate control box. It doesn't make economic sense to add a bunch of wires to use a traditional thermostat.
It's quite likely that you can install a Honeywell thermostat. The 3000 series and 5000 series (and maybe others) non-programable units should be fine. They all have internal battery power (2 AA batteries). There are many other brands that are similar.
The only thing any thermostat does is close a switch at the right temperature. Electronic thermostats do that with relays instead of mechanical switches. The only thing special about RV digital thermostats is that they operate on 12vdc instead of 24vac like home thermostats use. The self-contained digital ones, like Honeywell, don't use any external power, so it doesn't matter. They use internal batteries.
You need to connect the +12v wire to the thermostat (R) terminal.
The wire to the furnace connects to the (W) terminal.
If you have a ground wire, don't use it.
If you have a fan wire, it connects to the G terminal.
If you have an A/C wire, it connects to the Y terminal.
You will also have to go through a short programming set-up.
Of course, you will have to replace the batteries regularly to prevent leakage and internal damage.
EDIT: After reading the posts below and doing a little more research, I can see that this is completely wrong. Disregard everything in this post. There IS something different about a Dometic 3-wire thermostat: a separate control box. It doesn't make economic sense to add a bunch of wires to use a traditional thermostat.
