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gennady

gennady

Joined on January 27, 2011

Last Post on August 30, 2014

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Recent Posts

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trv

@ November 2, 2013 8:26 AM in danfoss ra2000: how do I reverse?

just relocate trv to another radiator port

piping

@ October 27, 2013 9:12 AM in Ex tanks problem

are those boilers piped as shown in attached diagram?

Night setback

@ October 27, 2013 6:57 AM in outdoor reset and thermostat setback

You have to have remote viessman control unit instead of thermostat set to reduce mode with schedule programmed in. Regarding second zone, you need another control unit with mixing valve installed and programmed. Just shutting boiler or zone valve on outdoor reset system will lead to very long time to get to desired zone temperature after turning zone on.

workmanship

@ October 24, 2013 10:16 PM in Bosch Greenstar Combi 100 / Not sufficiently heating three zones

I do not want to sound negative, but workmanship here is not acceptable in my opinion.
Also:
I do not see acid neutralizer on condensate drain line.
I do not see BFP drip line extended to no more that 6" AFF
I do not see min 18" before and after air scoop
I do not see isolation and drain valve on expansion tank
I do not see DHW mixing valve
Just to name a few

installer

@ October 23, 2013 8:06 PM in Bosch Greenstar Combi 100 / Not sufficiently heating three zones

Why are you acting as you want to troubleshoot your brand new installation? Where is an installer? And all this installation looks like nightmare on elm street movie.

qualified tech

@ October 23, 2013 7:41 PM in We're falling behind

There none. And the ones who willing to learn are not capable because they are uneducated. And social level of heating technician or plumber is so low, that only leftovers of work force are forced into this trade. Then "do not shoot the piano player, he plays as he can".

dual setting aquastat

@ October 22, 2013 9:54 PM in aquastat setting

hi 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.

cost of pumping

@ 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.

pump

@ 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?

drip

@ October 9, 2013 9:22 PM in Hartford Loop?

You will still need a drip for the header

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?
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