Joined on November 26, 2011
Last Post on August 28, 2014
@ April 4, 2013 12:34 PM in Just Don't Get Modcon Boiler Pump Charts!is just "they way we've always done it" over here. When you combine that with a generous allowance for idiotic piping, you end up with the manufacturers recommending (or even supplying) pumps which are oversized in about 95% of the installs we see.
@ April 4, 2013 12:29 PM in Just Don't Get Modcon Boiler Pump Charts!are inexorably intertwined. If either is right, the other will also be. The boiler does not sense or monitor flow, so as long as you stay away from the ∆T alarm threshold it will be happy.
@ April 4, 2013 12:28 PM in Just Don't Get Modcon Boiler Pump Charts!Will deal with it, including pre- and post-purge cycles.
@ April 4, 2013 11:13 AM in Just Don't Get Modcon Boiler Pump Charts!Is a bit below the curve of a 006. Taco makes a 006-VVF4 which the Lochinvar could control via its 0-10V output.
Taco, how about some more pump end options for the HEC?
edit: While you're at it, give us a 0-10V input along with the internal controls.
@ April 4, 2013 10:28 AM in Just Don't Get Modcon Boiler Pump Charts!Varies with firing rate. What's your system head at 3 GPM? I'd probably be looking at an ecocirc e-Series for this.
In a perfect world, you'd use a properly sized ∆T-controlled circulator. A Taco HEC-2 (Bumble Bee) is oversized and would be operating at the edge of stability. I don't believe they make a VDT version of the 005.
We really do need some smaller smart circs...
@ April 3, 2013 10:16 AM in How often should the boiler limit switch be reached?Deep setbacks are generally not a good idea with radiant heat. Did you recently acquire the property?
@ March 31, 2013 4:34 PM in Flat plate installPump away from the tank and all should be well.
@ March 31, 2013 12:07 PM in US shale gas to heat British homes within five yearsusing batteries still has a ways to go http://oilprice.com/Energy/Energy-General/Calculating-the-True-Carbon-Footprint-of-a-Renewable-Energy-Grid.html
@ March 31, 2013 11:40 AM in Just Don't Get Modcon Boiler Pump Charts!I can see -- other than a tad more pumping energy with the lower ∆T. I aim for 30F with radiators when designing - we usually end up closer to 25F once the system is fully balanced.
@ March 31, 2013 11:02 AM in Just Don't Get Modcon Boiler Pump Charts!on the reply link to the right of the post if the title is ? or . or similar. No problem replying to other posts or the thread in general.
@ March 31, 2013 1:27 AM in Just Don't Get Modcon Boiler Pump Charts!Assumptions = ∆T in this case, on which both boiler and baseboard should be able to agree. I'd probably install a Bumble Bee and see what I could get.
@ March 31, 2013 1:11 AM in Just Don't Get Modcon Boiler Pump Charts!I'm a huge fan of direct-pumped firetube mod/cons. Just need to me absolutely certain that both source and sink are sized using one set of assumptions.
@ March 31, 2013 12:52 AM in Just Don't Get Modcon Boiler Pump Charts!only works if (a) the boiler HX can handle the required water flow and (b) the emitter system can lose heat fast enough. In the case of a water-tube mod/con HX paired with low-temp radiant floors a conflict usually arises.
@ March 30, 2013 9:06 PM in US shale gas to heat British homes within five yearsWas a geologist who did decades of research work at Shell. His projections were just about dead-on with regard to US production (a correction for hyperbolic versus parabolic curves eventually created a better fit.) The mainstream media and the general public continue to ignore the real meaning: Peak oil signals the end of _cheap_ oil, not the end of oil. What the industry faces are higher extraction costs, higher risks, and lower ERoEI.
Despite the temptation, I'm going to stay out of the political argument. I believe the facts speak for themselves with regard to domestic production of both oil and gas.
@ March 30, 2013 6:16 PM in US shale gas to heat British homes within five yearsWe knew this was coming http://www.guardian.co.uk/environment/2013/mar/25/us-shale-gas-british-homes-five-years
How many more deals like this will it take to get the wellhead price up to where they want it?
@ March 30, 2013 12:03 PM in Pump for Washing machinewould be overkill for laundry, but there is no shortage of options
@ March 30, 2013 11:56 AM in Electric boileran off-the-shelf ORC (possibly with some kind of adapter if it's an older interface) should get you there pretty easily.
If not, I'd replace either the low voltage side or everything in front of the elements depending on what was in there.
@ March 30, 2013 1:44 AM in Electric boilerMost large electric boilers I've seen have multiple elements and some kind of switching. The newer ones have TRIAC controls, which can be retrofitted to almost anything.
@ March 30, 2013 1:33 AM in Need Assistance with a Laing EcoCirc EM1Is a slightly different beast http://completewatersystems.com/product/e-series-brass/
Laing ecocirc E1 is also sold as a B&G ecocirc e3-4
Laing eccocirc E4 is also sold as a B&G ecocirc e3-6
The B&G models are available at the usual online suspect, as well as directly from most B&G reps as far as I know.
Great little pumps, at least in the Vario flavor I've used. Wish they had one with a 0-10V input...
@ March 29, 2013 11:43 AM in copper press fitting questionthanks.
I had to special order a bunch of cushion clamps to get the right sizes. Here's a chart which should work for any metric OD-controlled pipe:
Cushion clamps (Anvil part numbers):
pkg p/n OD Pipe OD
25 AS 014P 0.84" 20mm 0.79"
25 AS 016OD 1.00" 25mm 0.98"
20 AS 020OD 1.25" 32mm 1.26"
20 AS 026ODN 1.62" 40mm 1.57"
10 AS 032OD 2.00" 50mm 1.97"
10 AS 040OD 2.50" 63mm 2.48"
5 AS 048OD 3.00" 75mm 2.95"
5 AS 056ODP 3.50" 90mm 3.54"
@ March 29, 2013 11:11 AM in copper press fitting questionon both jobs. I'm curious what supports you're using on the Climatherm?
@ March 28, 2013 11:11 PM in copper press fitting questionDon't think I'd be comfortable directly connecting it to a boiler steam outlet, but I'd love to try it on some condensate lines.
Edit: Climatherm is just SDR11 Faser. The DHW stuff (SDR 7.4 Faser) is a bit tougher (but has reduced capacity thanks to its smaller ID.) I have trouble seeing why the SDR11 is approved for 200F heating and yet not approved for DHW (other than the fact that the SDR 7.4 sells for more.)