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gennady

gennady

Joined on January 27, 2011

Last Post on July 20, 2014

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Recent Posts

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Zoning

@ October 7, 2013 8:21 PM in Benefit of zoning with outdoor reset on MOD CON

Zoning 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.

column or section?

@ October 6, 2013 9:12 PM in Boiler Sizing

you get rating per section not per column. Please multiply to sections quantity

Rinnai boiler

@ 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.

Home owner

@ September 17, 2013 9:15 PM in New High Eff Gas Boiler

In 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.

Switch

@ 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.

pump

@ August 31, 2013 10:04 AM in Quietest Boiler ?

i think pump noise will be bigger issue than mod con boiler noise.

Indirect

@ August 24, 2013 10:18 PM in Instantaneous vs Indirect

Indirect 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.

pressure test

@ August 24, 2013 9:30 AM in new gas line pressure test

In 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.

Combi

@ August 19, 2013 9:07 PM in Seems to be a trend

I do not see ir as a combi. It is a boiler coupled with indirect water heater. Seems everybody moves in this direction.

90+

@ August 19, 2013 8:55 PM in W/M GV-90+

This boiler has no outdoor reset, no modulation.

Layout

@ 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.

Warranty

@ August 10, 2013 4:08 PM in Viessmann question

Isn't it a warranty issue? Where is an installer?

Price

@ August 7, 2013 10:39 PM in How is business

I 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.

prewailing wages

@ August 6, 2013 7:32 AM in Prevailing wage questions

I 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.

Boiler

@ July 31, 2013 7:59 PM in help with updating heating system

You 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.

alpha

@ July 30, 2013 10:46 PM in Grunfos Alpha

Very 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.

navien

@ July 30, 2013 10:26 PM in help with updating heating system

i 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.

Support

@ July 22, 2013 1:38 PM in Against the Plywood?

We do it like that

cadet

@ July 5, 2013 2:26 PM in Lochinvar WHN vs Crest vs others

cadet has gianoni heat exchanger, i would avoid it. Also i really do not understand why Lochinvar created a brand to compete with its own line of WHN.

thermostat

@ June 26, 2013 11:23 PM in Who makes modulating non-Condensing Boilers

Forgot to mention, disconnect thermostats, as well.

zoning

@ June 26, 2013 11:21 PM in Who makes modulating non-Condensing Boilers

modulating boiler has a minimum stable load. usually 20-25% of max output. if you divide minimum load into smaller loads by using zone valves, you make modulating boiler to work in on/off mode or even short cycle, and vaste a lot of fuel. If you use TRVs, you create indoor reset, and exact load from room to room. This is the most effective and comfortable heating. But you have to use VFD constant flow pump for this.

Baseboards

@ June 25, 2013 8:18 PM in Who makes modulating non-Condensing Boilers

You have to loose zoning it kills efficiency dead. Install TRVs Instead. Then install small mod con.
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