Joined on December 29, 2008
Last Post on August 23, 2014
@ March 13, 2014 7:39 AM in Primary Pump Viessman KM bus ?The variable speed pump options in Coding 2 are shut off for N. America even though the coding addresses are in the manual.
@ March 9, 2014 9:10 AM in Burnham recall?Guys,
Visit www.usboiler.net all the recall information is there to include filling out the info for Burnham to send you the modification kits. It's not just a pressure switch. That was the Crown recall..
@ February 25, 2014 9:10 AM in The best Delta T for a mod-con?Everyone is missing one key point...BOILER PUMPS are FIXED Speed. Boiler delta-t is always changing based on the systems flow demand and return water temp..You're selecting a boiler pump based on the flow rate wanted at design temp to get the full btu/hr out of the boiler.
If you are sizing a boiler pump for a 20 degree delta-t you will only get a 20 degree boiler delta-t on design day when the system side can pull out the entire flow rate of the primary/boiler side into the secondary and the secondary's delta-t is in full match and harmony..
@ February 24, 2014 10:41 AM in The best Delta T for a mod-con?It's all going to depend on type of condensing boiler and the application. What I mean is what is the heat loss of structure, type of condensing boiler and each zone's heat loss. Boiler pumps tend to be fixed speed as is any 3 speed pump.
That pump is moving a fixed gpm flow rate every time it turns on. If you have a small zone let's say that only needs 2gpm but your boiler pump is moving 6gpm all the time the 4gpm left over has no place else to go other then to b-line right into the boiler return. This is sending 4gpm of nice hot boiler water back into the return thus elevating the boiler return temp and in most cases it takes the boiler out of condensing mode.
There are a few post above with some wrong math.
@ February 22, 2014 7:55 AM in Help!! staple-up insulation foil mythR-Value is a radiant floors best friend. Like others have said R-19 is R-19 no matter the type. Sound like you have Onix tubing. The simple thing to do is to pull the installation manual and provide them with the manufactures insulation requirement.. If its installed with the minimum insulation as described by the manual then let them pay for it..
@ February 22, 2014 7:34 AM in Solution for consistent E8 Fault code on Viessmann Vitodens 222-F LP Boiler?Is caused because the ionization current is outside the range. Generally gas pressure issue. I have come across a bad wiring harness between the the gas valve and control. Also make sure the gaps are correct on the ionization and ignition electrodes.
@ February 18, 2014 8:52 AM in Poly Pro venting....Being a Viessmann guy have been using M&G's Concentric for a long time. Number one reason why you get condensate in the fresh air intake is running the vent through an unconditioned space. If you didn't have a proper connection you'd have cross contamination which is a much bigger problem then the condensate..
@ February 8, 2014 8:01 AM in Crown boiler doesnt keep up with thermostatA boiler is not sized by Btu/hr in a steam system. It is sized by the sqft of EDR (Radiation) and the boiler chosen for the job needs to be able to produce that sqft of EDR. My suggestion is to start measuring radiators before you do anything else.
@ February 5, 2014 9:01 AM in NORA is back!!!!Is a tax payer funded institution, just about everything when it comes to energy is R&D'd and tested there. Where do you think the Heat Pump Water Heater came from? Yes, GE developed its first but it was fully developed at Oak Ridge with GE.. What came out of it, Amercian jobs not a Heat Pump Water Heater made in China and shipped here like the others.
@ February 4, 2014 9:54 PM in NORA is back!!!!Why our political system is broken. This has to be buried in a bill that has nothing to do with NORA or the bills subject itself. So someone got another politician to vote for his bill as long as this was in it. Wonder who owes who the next favor? But NORA is back, that's what's important right? Glad for the renewal just not in favor of the process..
@ February 3, 2014 4:11 PM in Reading Vitodens 200W B2HA Return Temp.Shown is for the pressure drop in the HX only! System flow rate doesn't change based on outdoor temp, water temp in the boiler does, it would if the boiler had a variable speed pump controlled by the boilers logic.. But we like to Americanize things on this side of the pond. Maybe you should call the place you purchased it at and get some professional help.
Boiler should have been piped primary secondary utilizing a low loss header period..
@ February 3, 2014 11:21 AM in Reading Vitodens 200W B2HA Return Temp.You'd be flowing on the 35 degree rise 3.5gpm no matter what they temp is outside. How do you think you'd be over pumping the HX?
@ February 3, 2014 9:55 AM in Hot water baseboard heatingThis system to be reversed engineering. Start from scratch with heat loss, capable emitter capacity, etc and then see what should actually have been installed and then see at what design temp the existing equipment begins to tap out.
@ January 31, 2014 9:28 PM in Reading Vitodens 200W B2HA Return Temp.Think you better read a little more. It's a blanket statement for the 19/28/35 still have to look at the individual pumps curves..Hopefully my notes on Page 13 helps ya and your able to see them. Yes, this is the draft version TDM before the final was released so it may not be the same as the published.. Nothing changed from the HX pressure drop and flow rates.
@ January 31, 2014 7:51 PM in Reading Vitodens 200W B2HA Return Temp.The 0015 is not a recommended boiler pump and if you look at it's curve and the pressure drop in the HX you will see that the pump will exceed the max flow rate of the boiler...Rigth pump is a Grundfos UPS15-58 as recommended in the manual. You'd being working with a boiler flow rate of
3.5gpm with the UPS15-58 on speed 1..
If you cannot expel the boiler/primary side flow rate, no matter what type of condensing boiler into the system side, you end up with elevated boiler return temps, ie, small delta. Now, say thank you to Americanization of European technology. This boiler across the pond utilizes a variable speed boiler pump but not here in the great old USA cause we have to dumb down technology so its affordable to all..
@ January 31, 2014 12:19 PM in Reading Vitodens 200W B2HA Return Temp.Loaded question...Boiler return or system return? The boiler does not display return temps. Your boiler side delta-t will always be a moving target dependent on what gpm the system side is pulling out of the boiler/primary side. Your boiler pump is a fixed speed pump moving a specific x gpm each and every time it comes on. So if it is moving 6gpm and your system side is only taking 2, the other 4 has no place to go except right back up into the boiler return.
What which boiler? What's your boiler pump? What is your system side total flow rate and each zones flow rate? Did you notice this when only 1 zone was on, all zones?
@ January 31, 2014 9:27 AM in Thinking of replacing existing pump for a Taco Bumble bee pumpThat's why the boiler should have been properly piped primary secondary. Sure hope you never need more then 6.2gpm...LWCO is useless so it doesn't matter...
@ January 31, 2014 7:36 AM in Thinking of replacing existing pump for a Taco Bumble bee pumpLWCO is in the wrong place though it doesn't matter because the boiler won't fire anyway if you don't make the flow switch..With the boiler needing a min flow rate of 1.7gpm across the HX and you are not piped pri/sec wouldn't recommend it unless your going to run it in a constant pressure mode.
What's with that zone valve and the ball valve? Some sort of by-pass?
@ January 29, 2014 4:18 PM in Time to Upgrade my ModconThe high end of the modulation rate that causes short cycling its the low end. Boiler will never go to 100% unless you need it but you are limited on the low end. Don't know what your DHW demand is but why not use a Vitodens B2HA-19 or a small Loch WHN the low ends are like 11K btu/hr, add storage on DHW with a 140 tank temp and mix down.
@ January 28, 2014 10:29 PM in System Running. I am extremely grateful!From Connecticut. Was born and raised in Westerly RI and worked in Groton for years. Moved to NY 10 years ago..
@ January 28, 2014 10:11 PM in Burner regulationWith Lamda on Vitodens, the boiler is able to adjust gas independent of air. It will always burn clean. Has to. If combustion came out of the range, burner would shut down. Here is the other thing that is missed when it comes to Lamda. CONDENSING!!!!!!!
If have Vitodens out there pouring at 160 supply. Why, lamda...
@ January 26, 2014 9:04 AM in Are Taco ZoneSentry valves noisy?Since the valve is a true full port with no restrictions with a high CV rating unlike others and uses stored power to close is it the valve making the noise or the fact that the zone is unbalanced and your over pumping?