Joined on October 14, 2003
Last Post on October 4, 2013
@ October 2, 2013 6:03 PM in boiler sizingI have a system with 371 sq. ft. of radiation. If I multiply by 240 = 89,040 BTU. Multiply x 1.5 pick-up= 133,560 BTU. The boiler brand I would like to use lists AHRI NET RATINGS in sq. ft. and they have one sized at 381 sq. ft. 122 MBH. Literature states net ratings use pick-up factor o 1.333.
I think this boiler would be correct for the job and would like to confirm that I am using the right math.
@ July 12, 2013 6:23 PM in Sizing boilerFor building is at 108,000 BTU's. Looking at the BUDERUS GB142 boilers as owner requested and it seems we land in the middle of two sizes. I looked at the TRIANGLE TUBE condensing boiler and they also are around the same outputs. With a fan coil system such as this where the smallest zone load i have is 18,00 BTU can I use the larger size and let modulation do its thing or do I use a slightly under sized boiler and assume my heat loss is generous?
@ July 5, 2013 5:14 PM in Sizing boilerHeat loss is a heat loss. I need from HVAC a chart for his coils to tell me how much and how hot, to satisfy the heat loss. I was always under the idea that a coil in these type of systems do not work well under 150 degree supply temps. Thanks for the help!
@ July 4, 2013 11:34 AM in Sizing boilerwhere it gets fuzzy for me. I am familiar with a heat loss for hydronic heating. Forced air uses the same formula? How does it correlate to the fan coils if I figure my BTU? Not sure if I am asking the question correctly.
@ July 3, 2013 5:46 PM in Sizing boilerWhat is the proper way to size the boiler for a forced air with coils system.
I have the job of plumbing the boiler with supply and return piping to four coils. The HVAC person has split this house into four zones. Each zone has what appears to be the same 3/4" coil in the duct work. The customer also wants a BUDERUS GB boiler regardless if he needs it or not. The HVAC person has told the customer he needs a 150,000 BTU boiler. I am sure he pulled that number out of the air. I have plumbed these type of systems before using basic on off boilers with high limits set to 180 degrees and figuring 40,000 btu's per 3/4" coil. They have worked fine, but now i need to know the proper way to figure my actual loads. Thanks for any input.
@ February 13, 2013 5:32 PM in Gas TrainingI would be interested in one day class on combustion, or maybe two one day classes a week apart? Not able to commit a whole week at a time.
@ December 7, 2012 3:26 PM in Creeping pressure on boilerProblem on a new install. It would take about a week to climb to 30 lbs. Pin hole in the indirect coil. I was certain somebody was messing with that boiler feed.
@ March 22, 2012 3:05 PM in taco radiant mixing blockI want to know if using a taco radiant mixing block would work for boiler protection.
Looking at an atmospheric gas boiler and single zone heating with indirect water heater. Would like to set system for outdoor reset and also give boiler protection.
The mixing block appears to give what i need with minimal piping.
Thanks for any thoughts or suggestions.
@ December 22, 2011 4:36 PM in 3 pipe radiator?is placed so water is traveling into radiator. May be return from other rad or riser.
@ November 30, 2011 5:15 PM in wirsbo radiant manifoldsI have a job with wirsbo radiant manifolds that have clear sight glass flow meters on the returns. there are no valves on the supply tubes. Are these also balancing valves and if so how do they adjust. The system is maybe 8 years old. Thanks for all replys
@ November 30, 2011 5:11 PM in Crossed Hot Cold Pipe?is most likely seeking its own level through that tempering valve I see in the photo. Close the cold water to tempering valve. draining the boiler may seem like the solution, but in fact is not. Hope this helps.
@ May 20, 2011 3:31 PM in New HE Boiler for old house with radiatorsif the radiators are over sized? If the rads where sized properly when installed a condensing boiler may never see those low operating temps that give you high efficiency. Just because they are cast iron rads does not mean they are over sized. A non condensing boiler with outdoor reset may be smart choice.
@ April 11, 2011 6:26 PM in ZC ZR and beyond on TACO SR506 exp for primary pumpIf you take your neutral from the power input terminal and your hot from ZR terminal with jumper in place and power your pump. you can run a primary pump any time zone calls for heat.
@ February 15, 2011 4:38 PM in water qualityShould the water in a steam boiler be mantained to a certain PH?
If so, what is the proper Ph and how can this be mantained?
Residential low pressure boiler. Thanks for all replys
@ December 3, 2010 4:54 PM in Bypass with thermostatic valve?I have tried the thermostatic three ways valves and they work great. If you call DANFOSS they will help you with the location of the pumps and layout. It does involve a lot of fittings, flanges, tees etc. I wish somebody would sell an affordable pre-piped gizmo that would be easy to connect to a simple cast iron boiler that you could then pipe your heating loops off while giving the boiler the protection it needs.
@ October 28, 2010 3:44 PM in Pressure needed to burst cast iron baseboardCast iron would not expand and split like a piece of copper. It cracks for good. I had a similar job where a leak developed in the cast baseboard and it also looked at first like a crack and then on further inspection more like a bad cast. This baseboard was over 30 years old. Assured the customer this was a rare thing and to not worry. Sure enough a month later the same thing showed up on a section in another part of the house. That was over a year ago. I checked every place for a leak thinking the system at one time was taking on fresh water and causing corrosion. Everything was original no leaks. Fingers crossed.
@ September 7, 2010 4:56 PM in What's best fin-tube enclosure for bathroom?company. go-overboard.com they make covers in what ever material you like. It was a few years ago that I used them, but was pretty impressed with quality
@ January 14, 2010 3:48 PM in Joining cast iron baseboardJust wondering what you use on the push nipples when joining cast iron baseboard together if anything. I have always used a little pipe dope to help slide them together but the last job I did (whole house) has had leaks show up between the sections in more than a few spots. This is after a years time.
@ January 10, 2010 6:08 AM in yet another mysterious bleeding problemLeaving the caps loose on the main bleeder at boiler. You never get all the air out when purging, when you purge you are only adding more water and that means more dissolved air.
@ January 6, 2010 4:40 PM in add radiant zone to home run systemand hoping there was some sure fire quick and easy way to accomplish this.Looks like I will use the existing home runs and put the pex in the mud with a sensor and mix and pump at the boiler. Maybe first try having the pump only operate when the system pumps run. Thanks again.
@ January 2, 2010 10:17 AM in add radiant zone to home run systemis taking place above the floor , so staple up is not and option. Boiler is a GB 142 and two pumps are running now basically constantly. I just posted to see if there was a way to utilize the home runs that are existing and also keep it simple. This bath is 10'x7' so the load is very small. Thanks for the response.