Is this an auto fill?

tjdumez

The part on top is my pressure reducing valve, I know that much. Is the device on the bottom an auto-fill device? It has to be, as the only wire coming out of it goes to my LWCO. It makes a buzzing noise and was hot so I disconnected the wire, but it wasn't adding any water or doing anything at all. I test the LWCO and drain a little water every 3-4 weeks so I don't really care to have auto fill, I just want to know if that's what that is and maybe an explanation of how it works


This caught my attention. That copper pipe is my water supply and presumably how I add makeup water to the boiler. Is there a purpose to that valve at the end? I haven't opened that in the four years I've lived here.

Here are some more pictures. The corrosion around the unions is annoying, anybody see anything worth noting?

GGross

the pressure reducing valve is the autofill

hot_rod

a solenoid valve below it

Jamie Hall

Actually the solenoid valve which was buzzing is the autofill -- the pressure reducing valve takes the stress off it (it would be regarded as an autofill on a hot water system, @GGross , but this is steam).

The odd valve mentioned at the bottom of the fill line can be used to drain the boiler. If it works, which it probably doesn't.

EdTheHeaterMan

I see only one black wire from the Solenoid valve ?!?!? How was this valve Wired? I hope the original installer didn't just send a 120 VAC hot wire from the LWCO alarm switch, and connect the Neutral (usually white Wire) to ground to complete the circuit. That would be a real Dunce move. Is there a way to get a picture of where that black wire goes inside the junction box cover on the valve.