Joined on July 24, 2003
Last Post on March 10, 2014
@ March 10, 2014 5:49 PM in Primary Pump Viessman KM bus ?For the older models (WB2B) the primary pump wires into the Power Pump Control Module and needs to pump 6-17 gpm, depending upon the load attached to the system side of the Low Loss Header. Min. is 6gpm.
On the new models (B2HA) (with the black control), the primary pump wires into the KM Bus, which has replaced the older Power Pump Control Module. It's still a relay box that mounts on the wall. We always use a Grundfos 15-58 for the primary pump and usually the Alpha pumps for the radiator or RFH load. There would be no advantage to changing the pump voltage as the system is meant to work "as is". The best savings or ROI will come from using "Smart" pumps on the system load.
You'll also void the warranty if system is not installed per factory wiring diagrams.
@ March 8, 2014 12:24 PM in pvc hangers for PAPPex needs to be supported every 4ft. Plastic snails are better than metal conduit hanger because the higher temps will expand the piping and rub on the conduit clips. Plastic is slippery and will not impede the expansion. 1" talons should be widely available at wholesalers or try pexsupply.com
@ March 7, 2014 6:27 PM in YodelTried it, spent over $4K...no leads closeable whatsoever.
@ March 7, 2014 9:49 AM in Completed boiler & chiller instalNice looking work. Are the pumps on VFD?
@ March 2, 2014 6:09 PM in Bad radiant in SeattleAhhhh, yes. But this is no game show....The price was too low for the builder to refuse. Now all the townhomes are plagued with yukky systems.
@ March 2, 2014 12:51 PM in Bad radiant in SeattleI've seen dozens of these installs over the years...they may vary in equipment but all use the potable hot water heater as the heat source.The Rinnai tankless connects to the Heat Box for mixing and distribution. In this case, the mixed temp was trying to heat (1) fan coil unit in the basement and (3) loops of staple-up without plates on the upper level. The thermostat for the Basement was installed 3 feet directly above the FCU. Shall we say short-cycle? Non-barrier AquaPex was used for all distribution. The setup requires an RPZ backflow device, but none was installed.
FYI, I refused to do any work on the system, unless it was replacement. I referred the owner to the local Rinnai rep as I don't want the liability for this system working correctly.
@ March 2, 2014 12:01 PM in Emergency contact info for Viessmann?If you need heat exchangers, they wouldn't be shipped until Mon. anyway. Hopefully, they have them in stock. I had to wait 7 days for one I replaced 18 months ago due to lack of maintenance. (No cleaning for over 7 years) Be prepared to pay for the replacements and shipping until credit is approved. Maybe it's a control problem...
@ March 2, 2014 10:58 AM in Emergency contact info for Viessmann?They're supposed to return your call on weekends from the 800 number. Take it up with the US sales manager on Mon. am in Rhode Island. Or take it up with Mr. Lutz, the new US VP. We've had slight difficulties even on weekdays getting tech assistance. Sometimes the wait for return calls is over an hr. I try and deal with James Brown, who has been there long enough to know the boiler line from 25 years ago.
@ February 23, 2014 7:43 PM in Underground Insulated PexEcoflex is available with a 10-14 day order lag from any Uponor wholesaler. There is a cut charge for orders less that a full roll. Just buried some 3 weeks ago.
@ February 18, 2014 2:21 PM in how prevalent is this?I'll be volunteering to perform radiant colonoscopies to proponents of open systems...without lube or anesthesia.
@ February 18, 2014 10:11 AM in bleeding a heated slab?Copper loops within slabs have a tendency to leak and ultimately fail due to the concrete alkalyds attacking the pipe from the outside in. I'd re-pipe the manifold to allow individual ball valves and a test port (boiler drain). Each loop should be tested yearly. Purging is not possible with the existing setup. The owners will need to invest in a better system....soon.
@ February 14, 2014 1:05 PM in What is this thing?This was a common method of air removal before "pumping away" became popular. It doesn't work very well after the vent becomes clogged or fails. Vet is also subject to freezing. Better purge methods happen at the boiler and also use an air eliminator with proper "near-boiler" piping.
@ February 14, 2014 1:01 PM in Cold dayAt the very least I'd be re-piping the boiler and putting the pump on the supply header, and removing the attic expansion tank and putting a new- "pre-charged" tank on the supply header before the pump location with CW feeder attached to the exp. tank location. Or replace the boiler.
@ February 9, 2014 12:02 PM in How, exactly doesI use the Alpha's on every project and have never had any issues with their performance. I've tested the amp load for comparisons and found the amperage displayed to be spot on.
@ February 7, 2014 1:33 PM in Need some serious helpThere are a number of serious piping errors in the "near-boiler" piping that create "choke points" for the BTU's trying to make their way to the heat emitters. The main header should be 11/4" , not 1" for starters.
The design temperature for Plattsburgh is -20 degrees. That means the system should keep the home at 68 degrees when it's -20 outside. If not, someone didn't do their homework.
@ February 7, 2014 9:09 AM in Radiant Heat in the NorthwestYes, If you have the economizer package for fresh air on the furnace, it must be on 24/7. Those who can, use HRV's since there are less than 5 cooling days per year in Seattle. Eastern Washington is very hot in the summer, and A/C would be much more common.
@ February 6, 2014 9:15 PM in obstruction in baseboard hot water systemYou may want to seriously consider replacing your boiler. Aside from it's age and reduced efficiency, the existing expansion tank could be waterlogged and prevent adequate fill pressure, even if the fill valve was replaced. It's cold and probably impractical in the middle of a cold winter, but without a repipe, you may get very frustrated.
@ February 4, 2014 3:12 PM in Radiant Heat in the NorthwestAll new homes or any renovations of over 50% of structure must provide ventilation to exchange .35 ACH. (not 4 or 5). Forced air systems typically use an economizer package with a 6" damper installed on fresh air duct with timer to allow fresh air into the return plenum to satisfy the requirement.
@ February 2, 2014 12:47 PM in Happy Super BowlI'm thinking Seahawks. All the better!
@ January 28, 2014 2:55 PM in New Vitodens B2HAJust commissioned this system this morning in a N. Seattle renovation. Using the newest generation of Viessmann boilers and controls can be trying, but worth it. The instructions will need to be revised. The black control is easier to program, and is easy to navigate. The only downside was learning that the LON pump control module will not allow the wiring of a DHW Recirc pump, if you are using HC1 and HC2(mixing valve).
The system heats a new basement and entry slab (mixing valve); Main Fl. Staple-up with transfer plates and 2nd Fl. Climate Panels. We used the Uponor EP manifolds, which are very easy to purge. Distribution piping uses Pex-Al-Pex. I was able to design the staple-up circuits and the Climate Panels within 5 degrees of water temperature, and didn't need a second mixing valve. Grundfos Alpha pumps drive the heating circuits. The VitoCell 300- 79g tank is behind the boiler wall and not visible.
@ January 26, 2014 1:05 PM in New boiler, Insufficent heatYou don't mention how the MB is heated. Embedded or Staple-up? Climate Panels or Quick Trak? If the contractor used a software program to design the system, (ie Uponor ADS) there are "what-if" queries that can show water temp requirements depending upon floor covering and insulation values. 120 won't do much if there is no underfloor insulation or a staple-up application without transfer plates or insulation. Do it right or do it over!
@ January 25, 2014 12:25 PM in Radiant Heat in the NorthwestIf your considering radiant heating, the more you know, the easier it is to make an informed decision. RFH has a higher installation cost than forced air, but will heat your home with extreme comfort and low gas bills. Typically 50%-60% less than a forced air system in Seattle. The system also makes the DHW for a residence.
You'll also have to ventilate the residence to the WA State energy code to provide .35 air changes per hour, but that's another story.
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