I have a fuel burner (fuel oil) that heats water and provides my home with baseboard heat. I have two thermostats and zone valves, both by White Rogers (and both pretty old): one set for the downstairs and one set for the upstairs.
I assume that each zone valve + thermostat pair is part of the same branch circuit and thus, controlled by the same breaker. If that's not the typical setup, please begin by correcting me!
But assuming I'm correct on that, I'm trying to figure out what breakers control both zone valve + thermostat pairs. My main service panel got upgraded last year but the electrician did a terrible job marking everything and did not mark where these were.
As opposed to lightswitches and outlets which are easy to test (turn a breaker off and see if a certain light goes out or if my electrical/volt pen doesn't detect any voltage in the outlet), I'm not sure how to test whether a particular zone valve and thermostat have power. Here is a picture of what they look like:
Can anyone give me a recommendation for how I could:
- Turn a breaker off; and then
- Check whether or not there's power coming to the zone valve and thermostat?
I have many breaker "candidates" for which ones could be controlling these valve/thermostat pairs, but currently I'm not sure how to test whether the breakers are/aren't supply power to them.
I suspect this will involve buying a multimeter. I used one in college for a class so I'm not a total stranger to them and wouldn't mind buying one if its the right tool for the job.