Joined on January 6, 2013
Last Post on March 8, 2014
@ March 8, 2014 8:36 PM in Pumping away ? I must have something messed up! HelpFrom one of my favorite Dan Holohan stories:
“Just one of those things,” I said. And we poked around the boiler room some more. And that’s when we spotted the bypass valve. It was up high, between the main supply and return lines. It was just a motorized two-way valve, and it had two operational choices: open or closed. We traced the wiring over to a pressure-operated switch in the main supply line. When the pressure got to a certain point, the two-way valve would open, allowing the water to flow back to the boilers.
“That’s there for when the thermostatic radiator valves are closed,” I said. “The water needs a place to go because the TRVs can’t talk to the pumps. The pump backs up on its performance curve. The pressure switch senses it, and opens the valve. The pumps now have access to the butt end of the boilers.”
“And the TRVs are going to be closed more often in the spring and the fall then they are in the dead of winter,” Joe said.
“Right. And when that two-way valve opens, eighty feet of pump head, or about thirty-five psi, hits the boilers.”
“Which are already seeing twenty-eight pounds of static head pressure,” Joe said.
“And that makes the total pressure sixty-three psi.”
“On fifty-psi relief valves!” Joe said, and he smiled. Problem solved.
It’s not just one of those things. Not at all. It never is when it’s mechanical. There’s always a reason for things."
It's a great story starting with 20 blown boilers sitting in a parking lot.
@ March 8, 2014 8:00 PM in Pumping away ? I must have something messed up! HelpTo take another picture closer to the primary pump/prv/tank?
@ March 8, 2014 12:49 PM in Pumping away ? I must have something messed up! HelpMight just be the picture but it almost looks like you are feeding supply water into the vent of the pressure reducing valve.
@ March 8, 2014 12:46 PM in Pumping away ? I must have something messed up! HelpCan you take another picture of the piping near the inlet to your primary pump and the pressure reducing valve?
@ March 7, 2014 9:41 PM in Recently Completed Radiant JobWhat kind of boiler did you use, Bob?
@ March 1, 2014 8:43 PM in Emergency contact info for Viessmann?Now that he has the numbers you may want to delete them from your post. The owners may not want Google (or worse) to grab their cell numbers for eternity.
@ March 1, 2014 9:55 AM in Switching from Oil to Gas"2. Other contractor say that a condensing would be a waste of money for me because I have base board heating so return water temp would be too high so boiler would be operating in non condensing mode at 85% efficiency."
Even if it wouldn't condense, the boiler would modulate and run on a reset curve meeting the demand more precisely then a non-modulating boiler.
@ February 28, 2014 2:30 PM in New Gas ConversionWhat do you do, wait for the words 'gas' and 'conversion' to appear in the same sentence?
Creeps me out.
@ February 27, 2014 2:28 PM in Apologies!I was reading the post about how you were going to stop doing seminars in a bit and then, "Poof"!
I thought you'd checked out.
At least the banner ads were still running for your sponsors.
@ February 27, 2014 2:21 PM in Apologies!At least you didn't activate the nuclear launch codes.
@ February 22, 2014 11:18 PM in Clocking My CGiI used 1040 btu/cf and used the 1/2' dial like you suggested.
Appreciate the response!
@ February 22, 2014 11:16 PM in Clocking My CGiMy heat loss calculations came out to around 100,000 btuh, so I think I was a little bit high on that.
Now I get to pick a boiler. Lot's of choices...
@ February 22, 2014 7:26 PM in Clocking My CGiToday I took a few minutes and clocked my gas meter while only my W-M CGi boiler was running. The boiler is rated at 133,000 btuh input, but by monitoring the gas meter I came up with an actual figure of 124,800 btuh.
This past year I completely rebuilt the distribution side of my system and am looking to replace the CGi with a modcon this summer. I've installed an hour meter and have been monitoring my run time to get some ball park figure on if my boiler is close to the right size. Using the DOE output rating on the plate of 112,000 btuh, the highest figure I came up with during sustained below zero weather was 89,000 btuh.
If the input rating is not accurate (for whatever reason), then I'd assume that the figure of 112,000 btuh I used the calculate btu's used to offset heat loss in my house is not accurate either.
I guess there are a few questions:
1) Assuming I am clocking the gas meter correctly (and I think I am) Why the discrepancy? Gas pressure?
2) The whole idea of recording my boiler's 'on' times was to get an empirical idea of how to size the new boiler. If the input on the plate is wrong, can I just de-rate the output figure printed on there by the same percentage that the input is off?
Thanks in advance,
@ February 19, 2014 11:59 AM in how prevalent is this?"I may be back in a couple of years for help designing my own system, but maybe with a different screen name so everyone doesn't hate me. ;)"
No need to change your name. You'll still get excellent advice because that is how it goes here. A bunch of hydronics nerds that love the art of heating with water. (And some Air Heads as well...)
@ February 18, 2014 8:00 PM in how prevalent is this?"Is your concern that it's not held at that temperature for long enough in a tankless system?"
Not really. That 140 degree water will not stay that hot. As soon as it is circulated through the PEX it, by design, is meant to give up its heat. It is not the same as water in a closed loop system, it will be full of oxygen and will be a lukewarm bacteria incubator.
Because it will be mixed with the same water MMM will shower with, he will be bathing in a soup of this water.
In a proper setup there is a physical separation between the heating fluid and the domestic hot water side.
BTW - I am a homeowner who has learned a lot from this site. Enough that I redid my entire heating system. These are some of the most helpful people on the internet. Sometimes you just have to humbly admit you don't know everything about everything.
@ February 17, 2014 9:54 PM in i think i have discovered a new missing variable ,Be sure to multiply the heat gain by 2.38 if the neighbor is also a politician.
@ February 15, 2014 3:39 PM in Viega press sleevesIf you read the brochure on their site that is a completely different. Uses an expander ala Uponor but then a tool to slide the sleeve over the tubing and fitting.
It's a shame that the Viega sleeves are no more. A have a few dozen left. If you have to redo a layout and cut the fittings out, you can remove the pressed sleeves and reuse the fitting. Now the fitting is wasted.
If anyone from Viega monitors Heating Help I'd like to hear the reason these went away. I made an investment in the tools and love Fostapex, why remove a useful part of the system?
@ February 12, 2014 9:22 AM in Measuring and graphing indoor tempsCan't wait to see the graphs.
@ February 10, 2014 9:46 PM in Hot Rod,caleffi hydro air seperator vs p/s pipingHot Rod -
Should the indirect come off before the hydro sep on the boiler side?
@ February 10, 2014 12:49 PM in Chicago Nearing Record For Days Below ZeroCHICAGO (CBS) – With temperatures plunging below zero again overnight, Chicagoans were starting another work week in frigid conditions, and the city was approaching the record for number of days of subzero cold.
As Monday morning’s temperature dipped to 3 below zero at O’Hare International Airport, Chicago now has had 20 days of below zero temperatures this winter. Temperatures were even colder in the outlying suburbs, where it was up to 14 below in Aurora and McHenry, and 13 below in Kankakee.
Only six winters on record have had more days of below zero weather in Chicago: 1884-85, 1935-36, 1962-63, 1981-82, 1874-75, and 1978-79.
The record for most days of below zero temperatures was set in the winter of 1884-85, when there were 25 such days. With more than a month left until the first day of Spring, and at least one more day of subzero temperatures this week, it’s quite likely Chicago will break that record.
@ February 9, 2014 10:43 AM in Hot Rod,caleffi hydro air seperator vs p/s pipingHi Johnyy88 -
I'd suggest viewing the Coffee with Caleffi that Hot Rod just finished. He goes over primary/secondary and hydro separators.
I think it was an hour well spent.
Here is the link:
It is the one on mod/con piping...