Reicherb
Member
I have a Well-McLain Series 3 P-D--7 boiler that I believe to be original to the house which was building in 1968. 2 of the zone valves were replaced in 2008. The last was replaced by me a few months ago. I've discovered that the circulation pump is often running when no zone valves are open and the boiler isn't running. This explains the previously explainable high electrical use.
The control/relay unit is VERY old. It's got magnetic contacts that seem to stick together when energized (B in the picture below). I've sanded them repeatedly and it's made no difference.
I assume my next step is to replace the controls. Can you please help me select the correct part for this application?
Here is a pictures of what I have now.
Thanks,
Brad
The control/relay unit is VERY old. It's got magnetic contacts that seem to stick together when energized (B in the picture below). I've sanded them repeatedly and it's made no difference.
I assume my next step is to replace the controls. Can you please help me select the correct part for this application?
Here is a pictures of what I have now.
Thanks,
Brad