Old Watts LWCO sill available

GW · January 26

is there any likelihood I could rebuild this low water cut off?

Or, chuck it and put on a 67

it’s a millivolt so that adds to the joy

The lady somehow overfilled the boiler, I took 20 gallons out of it, brought it down to the very bottom of the boiler still wouldn’t shut off.

mattmia2 · January 26

it is millivolt but it is all wired in romex?

you could probably take it apart and clean, the float is probably just hung up on muck it although replacing it with a MM would be a great idea for safety reasons.

Steamhead · January 26

That Watts hasn't been made in a long time. Get a 67-G, not a regular 67- the G is millivolt rated.

Intplm. · January 26

Disconnect the copper tubing off of the top and use a hose from a sillcock or any source of street pressure and run water through the top. That should flush the thing clean and get it working.

tim smith · January 26

Old Roberts Gordon burner, worked on many of those over the years. Agree on the Macdonal Miller 67-G with quick connects. Supply house is out of stock but cheaper than others. Not avail till around february 11th. https://www.supplyhouse.com/Mcdonnell-Miller-149600-67-G-67-Float-Type-Low-Water-Cut-off-for-millivolt-service-Steam?srsltid=AfmBOoq3m8nT5e2fZVDmT9PO_xSAmXMtLJkk00wNVatR0kXE3YtvlMue

Looks like maybe State supply has one or more in stock, you would need to verify.

https://www.statesupply.com/mh1066?srsltid=AfmBOopIPUDeVFFjYlVIFAPvFENvPurDzQn9EmOvJBXzHZkQufckwvmP

mattmia2 · January 26

sometimes stuff that supplyhouse.com shows as out of stock or with long lead times miraculously shows up when you order it

GW · 2:35AM

@tim smith a couple years ago I posted the same boiler on the wall, I believe. We are chewing through powerpiles, every couple years we have to replace. Somebody mentioned, might’ve been you, we are overheating the powerpile. And there was some gadget that was there at one point, no longer there, that kept the from it from overheating.

Does that make sense? Can you think of any way that we could make the power pile last longer?

tia

mattmia2 · 3:16AM

some here have sad that the baso thermopiles are better quality than the wr or residio resideo? residewell?

109A_5 · 4:35AM

I have cleaned my M&M 67 twice in 50 years. I bet that LWCO could be cleaned, you may have to make some custom gaskets. I stopped using the paper gaskets, although they are available for the M&M 67. I made reusable gaskets out of 1/32" silicone rubber sheet material. Makes the job easier.

EBEBRATT-Ed · 5:59AM

@GW the Watts is still listed on their web site. Don't know if parts are available. looks like a Smith model 24. They lasted forever.

How many wires into the LWCO. That looks like K & T wiring or maybe old Romex.

Vapor system.

mattmia2 · 6:28AM

either early romex or individual wires in loom.

EBEBRATT-Ed · 1:41PM

@mattmia2

Looks like loom to me as well. That's why I asked about # of wires in LWCO. Loom it's two Romex is 4. Looks like conduit going up overhead from burner so probably a JB up overhead

109A_5 · 3:08PM

If you look at the cable placement, it looks like there is only one cable to the pressure switch, so I would say two wires per cable assembly (or loom).

One wire per cable assembly would not work unless they used the piping for a return at the pressure switch.

GW · 4:11PM

https://forum.heatinghelp.com/discussion/comment/1884378#Comment_1884378

pretty sure its Resideo in there now. It's definitely overheating. The burner drops out, and I then measure the MV (where the pp connects to gas valve, and the stat-safety is off the vale/disconnected). The numbers slowly climb on the off cycle. When the numbers climb enough, the main burner comes back on (when I reconnect the stat-safetys). And the process repeats.

GW · 4:12PM

Nice, I guess making gaskets can't be super difficult, I will google that 1/32" silicone rubber sheet material

mattmia2 · 4:22PM

you can probably just use permatex too unless the gasket is shimming some critical clearance but i doubt it is in something like that.

GW · 4:26PM

I ordered the 1/32"

I forgot to get some exacto knifes, i'll hit up amazon again

Not sure why I am trying to keep this on the cheap, the lady pays full price and she also kicks cash tips. Yesterday she asks" do you have kids". I say I have two adult kids and two grandchildren. She pops a $50 in my hand and says this is for your grand kids 😊

109A_5 · 5:10PM

I used something like this. It was years ago when I bought it.

Red Silicone Rubber Sheet 60A 1/32 x 9 x 12 Inch Made in USA Gasket Material

https://www.ebay.com/itm/234098580147

When I take it apart I just rinse it off with warm water, and reuse it, no more gasket scraping. So far I like it.

Old Watts LWCO sill available

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