Last September my CT80 radiothermostat would not signal cooling despite the measured temperature exceeding the temperature setpoint. It would be nice if a relative could manually switch the cooling on.

Is it possible or to wire in a manual switch to force (jump) the Red node to the Green (Fan) and Yellow (cooling) nodes?

  • RED NODE ===wire===switch===wire===Green node
  • RED NODE ===wire===switch===wire===Yellow node

A manual switch to engage cooling is a bad idea because it could be inadvertently left on. A better solution would be to have a second, basic thermostat. Wire them both in using a DPDT switch. One side would be the radiothermostat side, the other one is your relative stat.

Radio stat - - - equipment - - - relative stat Y____________Y_______/-_______Y G____________G______/-_______G

This way you can't get conflicts between the stats and no manual cooling issues.

Here's an better illustration enter image description here You don't need to use a rocker switch like in the picture any number of styles are available.

The key point is that the system is always working off 1 stat. If you wanted to set up the heat the same way you would wire it in a similar fashion but with a triple pole single throw (TPST) switch. They are a little harder to come by but still available in many styles.

| improve this answer | |
  • I can elaborate on that later if it's not clear, I don't have a pen or paper right now. – Joe Fala Mar 10 '19 at 20:34

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.