Best Of
Re: grohe smart " stupid box"
Intplm.
Re: Piping for New Steam Boiler
@delcrossv In a way I am starting from scratch, at least when it comes to the radiators that were disconnected (as in removed). I have to calculate the space in those areas and make sure the new radiators’ btu aligns with requirements of the room/space. In other parts of the home radiators were previously changed (don’t seem to be original to home) and I want to make sure they also satisfy those spaces. As for the radiator EDR, yes! I already did exactly what you mentioned. I looked up the radiator type (tube, column etc), did the math, and got the 740.1. Hope this helps.
Noah_1
Re: Experience I had with a boiler tech and what I learned along the way.
With all the money I dropped on this analizer it might be worth doing a couple jobs lol
the reducer is definitely on the list of things to do. Probably going to make that a summer project. I figured the numbers are good enough for now that it can wait a bit.
mo8414
Re: Experience I had with a boiler tech and what I learned along the way.
Don't know what your CO2 is but it should be around 8%. Looking at your O2 your are probably OK. Looks like a Crane boiler with the old CI burners.
In the 5th picture down the burner air shutters look closed. I assume this was a B4 picture??
Sad that you couldn't get a professional to even try and fix this.
Unfortunately, it is the times we live in.
Re: Snow melt slab insulation
it's not ground heat that rises, heat does not rise, hot air rises. Heat moves to cold, the rate of that heat transfer is partially dictated by the delta T. so while the ground temp of lets say 50f is warmer than the unheated slab temp of lets say 20f, when you put a heated slab into the equation the heat from the tubing approx 110f is greater than the 50f below and will also want to transfer to the ground, wasting your BTUs, the thermal break from the insulation helps reduce that unwanted heat transfer into the ground, and direct the BTUs to where you want it, the slab. So while the contractor in question might feel better about it, in reality he just wants to save a few bucks on install, cost his customers more money, and made up a story about the heat from the ground helping melt the snow to make himself feel better about it. This isn't even taking into account that generally the ground at the level of the tubing is not really 50f either its closer to air temp
GGross
Zone valve ratings and demo
On the spec sheet of any zone valve notice a number of pressure ratings.
The static pressure is basically the fill pressure of the hydronic system. Or main line water pressure in a potable water application. That could be 150- 200 psi or more
The maximum shutoff pressure, ∆P is the dynamic or flowing pressure the valve can shut -off. In a hydronic system this is the pressure the circulator develops, aka head. The pressure added to the fill pressure that the valves need to close off against.
This Caleffi 7.5 Cv valve has a 20 psi (∆P) shutoff. Different brands, different models will have different shut off capability.
A common HW 8 Cv valve shows an 8 psi shut-off number. Higher Cv will have lower shut-off pressure.
The next demo will be a HW valve test with one spring removed. Will it take the shut-off pressure down to 4 psi? 1/2 the valves rated close-off. If so, even the smallest of circulators could push flow past it.
I get some videos posted of the valves in operation.
So a spring return zone valve manufacturer needs to juggle the close off pressure, which is directly related to the spring force, against the close off speed.
Lower spring tension slows the valve close off, but you also need adequate close off, shut off pressure or you get unwanted "ghost" flow.
A system with a high head circ may be better served with a lower Cv zone valve. The Caleffi 1 Cv will close off 75 psi, for example. See the example of a 1, 3.5 and 7.5 Cv zone valve, the opening in the valve is the difference. Smaller hole= easier to close off flow.
hot_rod
Re: Experience I had with a boiler tech and what I learned along the way.
8.3% Co2 is good especially with your CO #s
Re: Drums of water in the basement as a buffer
Most any material can capture and store heat. It will always come down to…
Is the juice worth the squeeze?
hot_rod
Re: Lochinvar WB80 not lighting, many new parts already. SOLVED
you absolutely must adjust the new gas valve with a combustion analyzer or it won't fire properly or likely at all.
probably could put the old gas valve back in and set the combustion properly and be on your way.
the readings on the manometer would be the result of the house regulator and the pipe sizing. there isn't anything really useful to measure pressure wise on the outlet side of the gas valve.
it would be easy enough to test for voltage at the gas valve to see if the harness is intact.
mattmia2
Re: Snow melt slab insulation
That is kind of like saying "What goes into a tee must come out of a tee." Everybody already knows this, but it still needs to be said for some folks to hear it!
