New Thermostat Question
I have this furnace in my TC. There are only two connections to the thermostat, and they are labeled “Thermo” and “+Thermo” I’m installing a new thermostat, and it’s connected like ...
Forum Discussion
Well Drew, I ordered the temperature controller pictured above, and installed it.
The way I have it programmed, the target temperature is 40°, and it will let the temperature at the probe drop 5° below that before it will turn the furnace on. If the temperature gets 6° below the target temp, it will flash the display as a low temp alarm. The thermostat wires from the furnace are connected in parallel to the temperature controller and the wall thermostat. When the temperature controller is powered on, it will turn the furnace on regardless of whether the wall thermostat is in “Heat” mode or “Off”.
The instructions that came with the controller say that the “Rst” button also functions as an on/off button, but you do have to hold it down for 3 seconds. I installed it with a real on/off switch instead. I installed it where I did because it’s right above the furnace, and I had easy access to the power and thermostat wires. This is the backside of the unit. That’s the furnace below it.
The temperature probe is in the black and gray tank area, near the valves. It’s reading air temperature, but I considered whether I should have it in contact with the gray tank or maybe the pipe just before the gate valve. The primary intent is to prevent the gray tank from freezing, so it may take some experimentation to determine the best location.
The furnace duct that’s heating that area can be seen in this image (silver flex duct). I wanted the probe to be far enough away from it that it wasn’t immediately influenced by it, but close enough to the gray tank gate valve that it can prevent it from freezing.
Drew, I appreciate your help and suggestions with this. I didn’t even consider connecting two thermostats in parallel. I think it’s going to work just fine.
That’s why I like this place. Extra eyes, extra brains. :W
:):)
The way I have it programmed, the target temperature is 40°, and it will let the temperature at the probe drop 5° below that before it will turn the furnace on. If the temperature gets 6° below the target temp, it will flash the display as a low temp alarm. The thermostat wires from the furnace are connected in parallel to the temperature controller and the wall thermostat. When the temperature controller is powered on, it will turn the furnace on regardless of whether the wall thermostat is in “Heat” mode or “Off”.
The instructions that came with the controller say that the “Rst” button also functions as an on/off button, but you do have to hold it down for 3 seconds. I installed it with a real on/off switch instead. I installed it where I did because it’s right above the furnace, and I had easy access to the power and thermostat wires. This is the backside of the unit. That’s the furnace below it.
The temperature probe is in the black and gray tank area, near the valves. It’s reading air temperature, but I considered whether I should have it in contact with the gray tank or maybe the pipe just before the gate valve. The primary intent is to prevent the gray tank from freezing, so it may take some experimentation to determine the best location.
The furnace duct that’s heating that area can be seen in this image (silver flex duct). I wanted the probe to be far enough away from it that it wasn’t immediately influenced by it, but close enough to the gray tank gate valve that it can prevent it from freezing.
Drew, I appreciate your help and suggestions with this. I didn’t even consider connecting two thermostats in parallel. I think it’s going to work just fine.
That’s why I like this place. Extra eyes, extra brains. :W
:):)
