Best Of
Re: Air purging with poorly placed coin vents
That section on baseboard sounds all wrong . It should be on its own zone . Would it be fair to say it does not work well when its bleed ?
Big Ed_4
Re: Advice for replacing a Bell & Gossett 2-1/2" with a Grundfos
If the vibration is from the 60hz line frequency (very likely since it is a big single phase motor), putting the pipes on soft mounts won't help. To isolate the pump you need a length of flex hose before and after the pump with the pump itself hard mounted to the concrete. I had similar issue with a smaller pump and 4' of pex on either side cured it.
Modcon generally means that pump is running 24/7, on a such a big pump the electricity costs are not small. Usually an ECM pump will be about 1/2 the cost to operate with typical ROI in a couple of years. If you are replacing it, I would go for ECM just for that.
The only thing to watch is if is an older system with a lot of sludge, you need a magnetic separator before the pump. The big bonus in your case with ECM pump is they are WAY quieter and free of usual 60hz hum.
Also try to mount the new pump with a horizontal shaft. Puts less load on the seals and generally bad idea to put potential leak points above electrical wiring.
Kaos
Re: Marbles and Ghosts
Tank just needed to be drained and water level/air cushion reset and problem would have been solved.
Re: New Installation Circulator Flow Problem
The pipe size supplying the 3 pumps needs to be large enough to handle the gpm requirement when all 3 are running.
Looks like you have a 1" trunk supplying 3 circs? Maybe a piece of 1-1/4 thrown in :) under the boiler?
That may be adequate to keep any or all flowing their required gpm.
But if each zone pump needs 4 gpm, or more, 12 gpm total, the 1" is a bit undersized. Do you know flow requirements on the 3 zones?
8 maybe 10 gpm on 1" copper M
Best practice the "header" is sized for total gpm at 2 fps velocity, aka "fat" headers. Column #1 on the chart below is flow at 2 fps.
Those look like Vevor knock-off circs, are they 3 speed? If so try all on speed 1, that would confirm the suspicion.
hot_rod
Re: Advice for replacing a Bell & Gossett 2-1/2" with a Grundfos
if you have a 97% high efficiency boiler, you need to check the pump spec for that also. Some of the high efficiency boilers have high pressure drop heat exchangers and need to be primary secondary piping
Got a pic or brand and model?
hot_rod
Re: CARLIN EZ PRO gas conversion burner question - firing problem.
It needs to be set up properly with a combustion analyzer. Its likely excess air.
HVACNUT
Re: Alternate means of hydronic heating a room that is kept cool, but occasionally needs to be warmed up
sound levels measured in free space may be very different than what is measured installed in a hollow wall in a small room
mattmia2
Re: Water hammer in steam system
Need pictures. Water hammer is usually a pipe pitch problem. The condensate has to be able to drain out somehow,
Re: Compliance with NYC heating laws & resident comfort: send heat all day, or only when code requires?
@dschwarz I agree it will be trial and error. You will probably never get it perfect but holding a more steady temperature will reduce complaints and maybe reduce fuel usage…..no guarantee.
To large of a temp set back can be counterproductive.