Joined on January 27, 2011
Last Post on July 30, 2014
@ October 22, 2013 9:54 PM in aquastat settinghi is a boiler limit, set at 180, lo is to prevent condensation, set at 140. lo is preventing circulator from pumping constantly cold water trough the boiler. it allows to heat portion of the water at the time.
@ October 19, 2013 8:54 AM in why use primary/secondary if not needed?Sorry, i was unclear. Primary secondary piping cost of pumping is lower then the one of conventional setup even with 1 extra pump running. Just my 2 cents.
@ October 19, 2013 2:00 AM in why use primary/secondary if not needed?are you saying the pump in this set up is controlled by thermostat?
@ October 7, 2013 8:21 PM in Benefit of zoning with outdoor reset on MOD CONZoning and setbacks are not working well in systems with outdoor reset. You can either install TRVs on each radiator or do outdoor reset for each zone.
@ October 6, 2013 9:12 PM in Boiler Sizingyou get rating per section not per column. Please multiply to sections quantity
@ October 6, 2013 8:58 PM in Any concerns about Rinnai boiler?i checked them out and i do like it, But I install Viessmanns, and just love them.
@ September 17, 2013 9:15 PM in New High Eff Gas BoilerIn regards of your intention not to give up I remember one girl saying about a man who stocked her, it is better to give up than fight.
@ August 31, 2013 11:28 PM in Emergency Cutoff switch necessary for gas furnace...Emergency switch should be installed on each entrance to the basement and at the door next to boiler.
@ August 31, 2013 10:04 AM in Quietest Boiler ?i think pump noise will be bigger issue than mod con boiler noise.
@ August 24, 2013 10:18 PM in Instantaneous vs IndirectIndirect tank allows to size boiler to heating load and decouple DHW load from heating load. And because of that there is no need to oversize boiler. Also, post pumping allows to use heat otherwise be wasted. Also peak of DHW might be a huge btu draw, and gas line has to be sized accordingly. Instantaneous heater representatives try to convince it is not true, but in my opinion it is a big factor.
@ August 24, 2013 9:30 AM in new gas line pressure testIn NYC, gas pressure test must be 3 psi for 30 minutes, for unpainted pipe, and 90 psi for 30 min for painted pipe.
but in your jurisdiction if 2012 INTERNATIONAL FUEL GAS CODE® accepted:
406.4 Test pressure measurement. Test pressure shall be measured with a manometer or with a pressure-measuring device designed and calibrated to read, record or indicate a pressure loss caused by leakage during the pressure test period. The source of pressure shall be isolated before the pressure tests are made. Mechanical gauges used to measure test pressures shall have a range such that the highest end of the scale is not greater than five times the test pressure.
406.4.1 Test pressure. The test pressure to be used shall be no less than 1 ½ times the proposed maximum working pressure, but not less than 3 psig (20 kPa gauge), irrespective of design pressure. Where the test pressure exceeds 125 psig (862 kPa gauge), the test pressure shall not exceed a value that produces a hoop stress in the piping greater than 50 percent of the specified minimum yield strength of the pipe.
406.4.2 Test duration. Test duration shall be not less than ½ hour for each 500 cubic feet (14 m3) of pipe volume or fraction thereof. When testing a system having a volume less than 10 cubic feet (0.28 m3) or a system in a single-family dwelling, the test duration shall be not less than 10 minutes. The duration of the test shall not be required to exceed 24 hours.
406.5 Detection of leaks and defects. The piping system shall withstand the test pressure specified without showing any evidence of leakage or other defects.
Any reduction of test pressures as indicated by pressure gauges shall be deemed to indicate the presence of a leak unless such reduction can be readily attributed to some other cause.
@ August 19, 2013 9:07 PM in Seems to be a trendI do not see ir as a combi. It is a boiler coupled with indirect water heater. Seems everybody moves in this direction.
@ August 11, 2013 10:38 PM in Please Judge my layout...Double tees are piped wrong way, will not work the way it is piped. 250 is a size for extremely large mansion, are you sure this is a right size?
Also if you using zoning, you will most of the time use boiler in on off control, not modulation. No efficiency there.
@ August 10, 2013 4:08 PM in Viessmann questionIsn't it a warranty issue? Where is an installer?
@ August 7, 2013 10:39 PM in How is businessI solved this issue. I offer the best system for the job, no corners cut, period. I must make healty profit. If potential buyer cannot afford it, then he cannot have it. Simple like that.
@ August 6, 2013 7:32 AM in Prevailing wage questionsI did PW jobs for over 10 years, hospitals, housing authority, schools, you name it. Almost went bankrupt. Decided to get out of it in 2009, and concentrate on boiler work we always did. Somehow all those public work turn out to be at best break even. Amount of regulations, stupidity and lack of competency of people in charge is mind boggling. I 've seen excellent companies put out of business at will of people in charge. Steer away from those projects, they are burial ground for honest and competent contractors. This is not about how much you pay, it is about completely different culture.
@ July 31, 2013 7:59 PM in help with updating heating systemYou will live with new boiler for many years. Make a wise choice and do not get sold on price and rebates. I m also a huge Viessmann fan. This is only boiler I offer to my customers. I have no call backs and have no boiler service to run. Set it and forget it. As per mod con versus cast iron, the part mod of the name makes all the difference, modulation of firing rate is the key factor in the savings, and CI boilers do not have this feature. I did modify commercial CI boilers to get load matching by imitating modulation, but it comes at a cost and if you do work from the scratch, go mod con, no question ask.
@ July 30, 2013 10:46 PM in Grunfos AlphaVery good circulator. just calculate head for the zone and look up head - flow diagram for proper settings. it will stop when zone valve closes, but buy circulator with internal flow check valve.
@ July 30, 2013 10:26 PM in help with updating heating systemi guess homeowner just works for navien and working on brand recognition. Burnham alpine has gianoni heat exchanger and it is heat exchanger of the past. Weil Mclain has good boiler, just avoid their gv90+, Go with indirect water heater. it will allow you to size boiler for heating load and satisfy your domestic hot water requirements.