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Oh Steamhead.........A unique Air vent
I can't read all the tiny writing. It seems like a Bakelite housing on the outside. Mad Dog
Re: Excited about Boiler Design
if you use an old gas heater for a buffer, I would disable the aquastat, maybe pull it out and free up a port. Block off the flue on top and bottom. You will still get some heat off it as jacket loss.
It’s sounding like the air volume that HPWH manuals are suggesting, 700 sq ft, may not be adequate. This according to Larry and his friend Gary that is deeply involved in the HPWH analysis in actual run time

Re: What saying or quote sticks with you since you were a newbie?
Or when you have a SS impeller shaft that, due to its rotation, has a left hand thread (That's lefty tighty righty loosey) . "How long should we let them struggle with it till we let them know?"🤔😁😉

Re: What saying or quote sticks with you since you were a newbie?
A bit late to the party…
"Improvise, Adapt, Overcome"
Re: D.W. WHITEHEAD

Yours, Larry
Re: Clogged Heat Exchanger
Then @pecmsg's advise is not for you. He was referring to the water side as far as adding chemicals.
Let me read the manual to see if there is a maintenance procedure that will work for you.
Re: Cold Weather Conundrum
I clocked the meter based on instructions I found here and it would appear the boiler is under firing, by a lot.
Rating plate is 262,500 BTU, and I’m getting 124,500. (Formula is 30 seconds for one cubic foot, so 3600/30 x 1035BTU).
Not sure what the flame should look like, but can see a fair amount of orange, and flickering, which seems not good?
is there a way to determine whether the problem is related to gas pressure vs. the boiler?
Re: Steam traps
Yes. Thanks for the heads up. I've merged the duplicate discussions into one here. Thanks!
Re: HONEYWELL MODULATING MOTOR
Honeywell use to make several L91 pressure controls. Some just had a modulating setting. Some had the modulating setting and a "differential. The #s used to be L91A with no differential and L91B with differential if I recall correctly.
I seriously doubt it's the motor. I would say widen the differential if you have an adjustable control. If no you may have to change the control.
Also, when the L91 modulates and constantly hunts it will tend to burn a spot on the potentiometer in the L91.
To test it you could buy and adjustable potentiometer and wire it in place of the pressure control and see how the motor responds.
#30112A @ Supply House.com. But the price is outrageous.
If you disconnect the pressure control and use a jumper to drive the motor up and down (R-B then R-W) the motor should be good. It is usually the control.