Best Of
Re: Frozen valves on early vacuum system
I think tunstall makes a vapor valve. it can also be replaced with a regular valve and an orifice plate. heating it may help it come apart if you can do it without burning the plate
*mepco
mattmia2
Re: LPG btu output in cold weather
That depends on an awful lot, but you are right.
But id rather know that it's far from being a concern at all.
ChrisJ
Re: 0-3 gauge and negative PSI
Ha. I don't know what crazy science you two are using but if there is a rapid condensation (due to rapid heat extraction) in a closed system (vents still closed), that means fewer moles of vapor occupying roughly the same volume as before. Instead of imagining science look it up. That results in lower vapor pressure. That vapor pressure could easily go into a vacuum and a lower vacuum than would normally be observed.
Re: 0-3 gauge and negative PSI
Steam systems often pull down into a vacuum when they shut down, and it doesn't matter. In fact many feel it's beneficial.
It has nothing to do with a cold basement or a hydronic loop.
ChrisJ
Re: 0-3 gauge and negative PSI
I don't think it's your water pump that is making the pressure go negative. Rather, it is just the collapse of steam after the boiler shuts off that makes your pressure go negative. This is normal operation.
I haven't noticed my gauge having any trouble with this brief negative pressure, but if you're concerned you can put a ball valve under the gauge and only open it when you want to see the pressure.
Dwyer gauges including their Magnahelic can definitely handle it but one of mine is very similar to yours and it's OK.
Re: A discussion about wet steam to not hijack anyone's thread
Guys, If you spoke to an engineer or manufacturers who build boilers, they would tell you that they design them so that the water in the sections [cast iron boilers] or around tubes [fire tube boilers] flow when the water boils in a way that prevents hot spots and provides optimum heating performance.
Correct me if I am wrong: What is the purpose of this site? To provide help and guidance to people who have heating problems. Right? Let's keep our discussions and comments dedicated to that goal.
ARobertson13
Re: A discussion about wet steam to not hijack anyone's thread
What fun. I think there's a good reason I stayed out of this one!
Re: what is the purpose of the heat anticipator on a Honeywell T87?
It actually is a little heater that is built into the stat. (you can see it in the form of coil near the bi metal). It adds a little extra heat to the inside of the t-stat to prevent over shooting the room temp. Without it the redidual heat left in the heat exchanger after shut down would increase room temp. to above set point. You set it by matching the HA to the t-stat amperage draw. Hope this helps.
Ken D.
