![]() If, for some reason, you have a basic furnace that supports both communicating and non-communicating thermostats for compatibility but doesn’t have any features that require communicating then you can run the extra wires and use the Nest.We use cookies to improve your website experience. Many furnaces have legacy connectors that allow them to be used with non-communicating thermostats but you will be giving up all of the benefits of the equipment. Your only option is to upgrade to whatever “smart” thermostat is offered by the manufacturer. Unfortunately, there isn’t a standard communicating protocol used by all manufacturers, so no one can build a thermostat that works with multiple brands. This makes it impossible to do things like finely adjust the furnace output (you would need one wire for each % the output could be varied) or vary fan speed based on runtime conditions, such as static pressure (communication is only one way). The Nest is more basic, it can only communicate one way by energizing the wires connected to it which signal to the furnace when to do something like run the fan. This is a more advanced communication method usually used by modulating equipment. The CTK01 is a communicating thermostat it sends and receives data to/from the furnace digitally over two wires. ![]() how can the Thermostat not be compatible with that? that's dumb the two wires make up a glorified USB cable. ![]() is it possible to use Common wire for the Fan somehow and then figure out a way to get the two Data lines to work with W and Y or would i just jump the fan to those systems?Įdit: Just learnt that the data lines communicate via Serial protocols. i need to plug my wires into a W, Y and maybe a G (heat, cooling and fan from what i understand). At this point is it even compatible with my system? heres what im assuming i need to do. I have looked for it quickly while chatting with nest support but to not success. not HVAC systems.įrom what i understand, the 4 wires from my thermostat go to a "Outside board" (I'm assuming its not actually outside). ![]() I'm an automation analyst and went to school for network engineering. the data lines are obviously what are screwing me up. i have a ComfortNet CTK01 that uses R (24VAC) C(Common) and data lines 1 and 2. the problem I'm having is it seems my thermostat is not inherently compatible with my system. I just bout into the nest ecosystem (smoke detector, cams, thermostats and home minis) and its great. ![]()
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