Controller or switch for thermostat wires

[Cpeters]

I need to wire two thermostats to my boiler. What I need is a switch taking 2 thermostat wires and only coming out with one. I need it so that it doesn't back feed the one that's off if one is on. Two inputs one output. If either of both are on.

 

[hj]

There is NO "backfeed". What are you trying to accomplish?

 

[Sponsor]

 

[Cpeters]

There is NO "backfeed". What are you trying to accomplish?

If thermostat A is on I don't want power going back to thermostat B. The low voltage wires are coming off of the
circulating pump relays. If Thermostat A is on I don't want a signal to go to the B circulating pump otherwise both
circulators would run if either thermostat is on.

 

[Jadnashua]

What you're describing is usually done with zone relay control box, and without more info on how things are currently wired, hard to say if your concern is reasonable.

 

[hj]

With ONE "output" HOW are you going to control two different pumps?

 

[Cpeters]

With ONE "output" HOW are you going to control two different pumps?

Took out the 2 Honeywell r845a and replaced with a taco sr502-4. Works great.