Question about installing a water heat only thermostat...help...?

Question

I have baseboard heating in my house... the boiler is approx 50 years old.

My existing thermostats have 4 wires (white, red, green, and black).

On the NEW thermostat I bought, the instructions tell me to ignore the colors, and to copy the config of my old thermostat.

However, my old thermostat simply has red and white on one screw to the left - and green and black on one screw to the right.

Therefore, I cannot copy the configuration to from the old thermostat to the new, because the new thermostat requires each color to go to a seperate terminal.

Any ideas?

Answer 1

older homes ran the 2 together think of them as one and wire it as if you only had 2 wires always keep the 2 that are hooked together together

Answer 2

My first thought is that your new thermostat is made to run a system that does both heating and cooling. Obviously, your boiler only covers heating. Not only that, but some of the wires commonly control that blower fan -- something else you don't have.

A quick internet search comes back with a number of sites that suggest common wiring. Without seeing your setup, I hesitate to try to match these standards to your system. If no one else has more concrete suggestions, I'd ask a local heating company and/or the store where you purchased the thermostat.

Answer 3

red to red
white to white