Adding C Adapter to 2 Wire Thermostat in a 3 Zone Configuration

Whalensdad

I have 3 2-wire thermostats for my baseboard boiler heating. On one of the zones I want to add a Honeywell T9, so I can put a remote sensor in a different room (i.e. a den that is on the same heating zone as my basement). The thermostat has 2 wires (R and W). It attaches to my TACO 3 zone ZVC403 controller. Where it goes in, the screw terminal has 3 wire connections for each zone, of which only 2 connections are used. There is a C connection that is not used. Is the connection of the c-wire adapter as simple as connecting the adapter to R,W,C board terminals and the R,W wires from the thermostat to the adapter? If not, how do I install the adapter?

EdTheHeaterMan

NO

Is there an unused wire in the thermostat wire from the thermostat location to the ZVC-403?


Take a picture of the thermostat wire connection inside the ZVC-403 control from about 3 ft back with the cover off, so I can see the wires outside the box for about 1 ft in all directions.

The C wire adaptor assumes that there are at least 4 wires to the thermostat because it assumes that you have air conditioning and heat form your old thermostat.