Low Water Control??

Alan R. Mercurio

Here's a guy that can help answer your question. I have a lot of respect for him.

Greg Roder<BR>
M&M ITT Industries<BR>
(773) 250-1314<BR>
greg_roder@fluids.ittind.<BR><BR>
Your friend in the industry,<BR>Alan R. Mercurio<BR><BR><a href="http://oiltechtalk.com">Oil Tech Talk</a>

Rob T

LWCO problems..

At work we have a couple of WM boilers. They each have McDonnell & Miller 900-M LWCOs installed.

The units seem to work fine but have one annoying feature, whenever there is a power outage or even a nearby lightning strike they shutdown and need to be reset. This has led to some cold mornings in the parts of the buildings they heat.

Is this a normal feature of this LWCO? Is there a way (If advisable) to fix it so a power outage will not cause a shutdown or do I need to replace them with auto-reset models?

I don't mind the lightning strike problem, even though I don't think it should be doing this, as it mainly occurs during non-heating seasons.

I tried to check the M&M website and it seems to be down and all the vendors I checked no longer handle this model.

Any recommendations for a good LWCO? (I need one for my home system also and am looking at the M&M RB-24.)

Thanks!

Rob

Rob T

Thanks!

I'll drop him a line tomorrow. (Today is getting to hectic, funeral to get ready for tomorrow.)

Rob

Bob_19

Yes

a steam boiler has to have a saftey lock-out if their is a main flame faliure. This has to be a manuel reset causing the operator to physicaly attend to the boiler.

A power failure would be one of those times when this will occur. If you lose power you also lose pumps, automatic feed valves, which could lead to a dry fire situation. They don't rely on the LWCO to stop this from happening during a power failure.
The safety lockout treats it as a major failure not really knowing what the problem is, so it shuts down.
If your in a commercial or industrial site this is mandatory, I'm not sure how residential boilers are handled.

Rob T

Thanks for

the info. This is a hot water system, do the same standards apply?

If os I will just live with it and try and figure out a method of detecting when we have had a power outage, I see the LWCO has athe ability to trigger an alarm. Maybe I'll hook up a remote telltale to my office.

Thanks again,

Rob