Joined on November 26, 2011
Last Post on March 9, 2014
@ January 30, 2013 11:18 AM in Ghost flow where we don't want itrequires either a motorized mixing valve with appropriate controls or a specialized thermostatic valve like an ESBE or a Caleffi 280/281.
A bypass will provide some protection, but is not as good on the cold size or the hot side.
@ January 30, 2013 12:33 AM in Boiler protection mixing valvewill work (mostly) if your distribution system is designed for the temp the boiler runs at.
Much better to run separate boiler and distribution circs with a properly sized buffer tank, and a motorized mixing valve and outdoor reset control.
@ January 29, 2013 5:16 PM in New Boiler at the Best Mansionit _looked_ like a swing check, but then I got lost in the 'Dunham specified' bit. Thank you for clearing that up.
What I'm tinkering with is a 'modern retro' vacuum/vapor design based on currently available or easily fabricated components. It should be able to be retrofitted onto a conventional two-pipe system in the field. It may also be useful in rehabilitating vintage vacuum/vapor system which have suffered from knuckleheading.
I should probably start a new thread...
@ January 29, 2013 4:01 PM in Ceiling Radiant Heatworks just fine from ceilings. Hot air rises -- heat just conducts, convects, or radiates. Translation: As long as there is sufficient insulation above the ceiling, you are not losing much.
You need an electrician who understands radiant heating.
@ January 29, 2013 3:41 PM in Kharbonic?http://www.wattsradiant.com/products/flexplate/ is the only one I'm aware of, though not self-adhesive.
https://www.google.com/search?q=Kharbonics+graphite brought up two links to PDFs, but neither works. The domain appears to be parked.
@ January 29, 2013 11:17 AM in Boiler protection mixing valveCaleffi does show them piped this way on all their drawings, and the 281 also has its pump in the same location. I'm wondering if they have a reason for this? HR?
@ January 29, 2013 10:04 AM in Question on a steam article in PHC News, Jan 2013http://www.phcnews.com/jan_13/foley.php
@ January 29, 2013 9:51 AM in New Boiler at the Best MansionFascinating that a standard swing check turns out to open at the right pressure for venting the mains. I was mixing up the two valves. The "Dunham specified vacuum equalizer" looks new - they still make those?
@ January 28, 2013 10:45 PM in New Boiler at the Best MansionI fumblefingered 0030 into 0040 -- fixed.
Thanks, still wrapping my head around these vacuum/vapor systems so I ask a lot of questions.
image0030 - I see what looks like a swing check left middle of photo, to the right of a ball valve. Whatever it is, both ends are piped. It's the other brass valve with one end piped into consecutive bell reducers that that I'm curious about.
@ January 28, 2013 10:16 PM in Please take a quick momentNo video results for “David Broome r-22 conversion to 421a”
@ January 28, 2013 9:30 PM in New Boiler at the Best MansionWait -- you already said it was a BOY! -ler.
img0010 - are those your crossover traps?
img0030 - is that the "trap used as vent" you described a couple of days ago?
img0036/37/38 all show capped pipe stubs. Are these part of your future garage/apartment plan?
@ January 28, 2013 6:49 PM in Richardson 2 pipe steam system with NO Thermostatic Steam Trap but radiator air valvesThat square gauge looks older. I haven't seen enough nameplates to know if they started putting "American Standard" on them before they actually changed the name of the company. Given that the old (two) names are at the bottom of the nameplate, it may be the case. Sheet metal looks 1950s-esque as well.
Whatever the age, you've gotten your money's worth out of it for sure.
@ January 28, 2013 5:25 PM in constant circulationyour thermostats will become high limit controllers. This is very useful when you have external heat gains (wood stove, solar gain, etc.) which affect part of the space. They can also be used to turn down the temp in an unoccupied zone. It will likely take several hours to recover -- if you have guests coming you should raise the temp about a day before they arrive. You do not want to use them for day to day temperature control.
When the new system is first installed, crank them all up to maximum. Make adjustments to the reset curve (in the boiler controls) and adjust valves on radiators or supply lines until you have even heat throughout the house across a range of outdoor conditions. After this is done, set them 2-3F above the desired space temp and all should be well. If you fire up the wood stove or have a sunny day, they will prevent overheating.
Install an ECM circulator with that new boiler. It will change its speed as zone valves open and close and generally make the system happier. It will also cut your electrical consumption quite a bit.
@ January 28, 2013 2:18 PM in Radiant Loops One or Two63 BTU's per square foot.
12 GPM will never fit through a 3/4" pipe, and I doubt they designed it for a 30F ∆T.
You should seriously consider getting a real radiant pro to evaluate your system and make recommendations. You can stage them if money is tight, but you need a plan before you start piping.
@ January 28, 2013 2:14 PM in Moving Threads?by a moderator would work for me. Throw in the ability to lock threads (no new posts tacked onto 8 year old topics) and perhaps even moving a batch of posts off into a new thread.
If Dan were able to delegate this to a few trusted elves, it would help make things a LOT easier to follow.
@ January 28, 2013 2:08 PM in Returns questionJust look at the on-again off-again status of PEX for commercial construction in California if you want to see what can happen.
Aquatherm tooling represents enough of an investment that it is unlikely to become a preferred DIY material. Given this and its predominantly commercial/industrial applicability here (thanks to the widespread use of PEX for smaller pipe sizes) it should not suffer that kind of fate. It's a really wonderful system and I hope it goes far in our market.
@ January 28, 2013 1:46 PM in Radiant Loops One or TwoIs the house, and how big is the boiler (BTU/hr input rate)? Where is the house located?
@ January 28, 2013 1:41 PM in Returns questionMeans approvals from two national code bodies, requiring testing by specialized (expensive) laboratories. The test requirements typically date back decades, and were not designed with modern materials science in mind. Then comes the hard part: persuading states (and in some cases counties and cities) to accept the product or system. Unions and competing manufacturers who sit on code making bodies also get to weigh in. As do fire marshals. It's a multi-million dollar, multi-year proposition.
@ January 28, 2013 1:31 PM in Radiant Loops One or Twoare the determining factor, and those depend on heat losses in the other areas served by the manifold.
Ideally, the mixing valve should be motorized and controlled using an outdoor reset curve. Are there other types of radiation in the house (radiators, convectors, or baseboard)? What kind of boiler?
@ January 28, 2013 1:28 PM in Calculating flue gas condensing temperaturewhich would not be all that hard to measure.
Other combustion parameters come into play as well, but that would require measuring O2 or CO2 -- probably not worth the trouble unless you had control over the burner internals.
@ January 28, 2013 1:16 PM in Returns questionbefore you replace. This can happen as part of your boiler replacement, and a reputable contractor should offer to do so.
I'm the one who suggested PP pipe as a buried condensate return. Copper works just fine unless you have acidic soil or modern (fly ash) concrete. Climatherm costs about 20% less than copper for materials, but it requires specialized tooling and training. It has a 35-year track record worldwide but has only been available in the US for a few years -- and is not approved in all jurisdictions yet.