ekim5240 Posted November 3, 2014 Share Posted November 3, 2014 I am having an issue trying to install the c4 thermostat with a mm2 control board. It has the original Honeywell round thermostats right now. Because only one has a heat cool switch, how can I install the c4. The other problem I an having is I'm only getting around 12v at the thermostats. I'm not site if I need to change the control panel, if so any suggestions? Any ideas? Any help would be greatly appreciated69-1361-3.pdf Link to comment Share on other sites More sharing options...
Matt Lowe Posted November 4, 2014 Share Posted November 4, 2014 should be easy as long as you have an extra wire to get power from the common Link to comment Share on other sites More sharing options...
kajphotos Posted November 4, 2014 Share Posted November 4, 2014 You need an extra wire from the boiler called the C wire aka a common wire .. Or you will need a 24 volt transformer as a separate power source Link to comment Share on other sites More sharing options...
ekim5240 Posted November 4, 2014 Author Share Posted November 4, 2014 You need an extra wire from the boiler called the C wire aka a common wire .. Or you will need a 24 volt transformer as a separate power source Link to comment Share on other sites More sharing options...
ekim5240 Posted November 4, 2014 Author Share Posted November 4, 2014 How would I wire it worth the separate transformer? I'm only getting around 12 v even at the board using the common there. Is the old system a12 v system? Thanks Link to comment Share on other sites More sharing options...
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