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gennady

gennady

Joined on January 27, 2011

Last Post on August 19, 2014

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viessmann

@ May 6, 2012 7:35 PM in Help sizing new gas boiler

Yes  i was there.

new boiler

@ May 6, 2012 7:19 PM in Help sizing new gas boiler

why not 90+% efficiency boiler?

deleted

@ May 6, 2012 12:43 PM in Why Is the US Always Last

mini ducts

@ April 29, 2012 12:09 PM in Replace steam radiator system with high-velocity mini duct?

Mini ducts high velocity in my opinion is not an option at all. Installing properly sized steam boiler along with properly insulated, vented and controlled steam system, is the most economical way. (look at one pipe steam system control valves from Danfos).
2nd option would be convert system to hydronic heat with mod con boiler, but it will be pretty expensive proposition.

pump

@ April 26, 2012 10:32 PM in circulators burning out frequently

if installer mounted cartridge type pumps vertically, and if there is spring loaded check valve on discharge, it traps air and can create situation with pump working with no flow.

servicemagic

@ April 24, 2012 9:33 PM in servicemagic

The most dreadful waste of money.

Viessmann

@ April 22, 2012 7:18 PM in best high eff. gas boiler/ hot water heater

Viessmann as a first choice, Slant Fin Bobcat with Combi Cat unit as a second (economy)

polaris

@ April 15, 2012 8:21 PM in Polaris used for radiant heating & domestic hot water.

Steve , you are absolutely right in my opinion. Also i think plate heat exchanger is needed not for heating, but for domestic hot water. slant fin combi cat is just right for the job. Has build in circulator, activated by DHW flow sensor.

https://docs.google.com/viewer?url=http%3A%2F%2Fwww.slantfin.com%2Fimages%2Fstories%2FProduct-Literature%2Fcatalogsheet_dhwg_10a_dhwg-10a.pdf

utility

@ April 14, 2012 9:57 PM in gas line size? and how to determine size.help tim plz

Yes, i was referring to the original post.

utilities

@ April 14, 2012 9:54 PM in gas line size? and how to determine size.help tim plz

In NYC utility can run service to house and install house gas valve. this is where their jurisdiction ends.

design

@ April 14, 2012 9:46 PM in Not always mod/con

How will they know what they are buying?

HDD

@ April 14, 2012 2:56 PM in Not always mod/con

To do proper comparison, heating degree day method will be more accurate

.

@ April 14, 2012 12:57 AM in Not always mod/con

.

gas line sizing

@ April 14, 2012 12:22 AM in gas line size? and how to determine size.help tim plz

http://www.engineeringtoolbox.com/natural-gas-pipe-sizing-d_826.html

are you a master plumber? if not, why are you working on gas lines not knowing basic gas rules?

XPRESS

@ April 13, 2012 9:40 PM in Propress or Xpress

I m using x-press for 3 years, no leaks.

freewatt system

@ April 10, 2012 6:15 PM in Any issues with this near boiler piping diagram?

What Freewatt does , is supplying electricity for 1/2 price and heating and hot water for free most of the time. net metering applies here to the extent, that you do not want sell electricity back to utility, all you want is to keep electric meter around 0. during electrical consumption house gets electricity from Freewatt and grid, so meter rotates to positive direction, at night, when Freewatt generates more than house consumes, it send power back to grid, and meter rotates to negative direction, decreasing electrical meter reading.

exp tank connection

@ April 10, 2012 8:04 AM in Any issues with this near boiler piping diagram?

i do it the way it shown on the picture, If there dirt it goes down not to expansion tank . actually there is no flow in the pipe between exp tank and connection tee. it is dead end pipe.
Also, after flushing, chemical cleaning of the system and adding water conditioner, there is not much dirt left in the system.

flow check

@ April 9, 2012 10:51 PM in Any issues with this near boiler piping diagram?

you do not need flow check on low mass boilers. especially on boiler side of LLH. Also i would move expansion tank to the bottom of low loss header.

pipe

@ April 8, 2012 2:54 PM in Little Brass Cup-shaped thing above expansion tank is leaking

Also, you must have straight piece of pipe with no connections at least 18" upstream of this brass thing, ( or to be exact, cast iron thing it is mounted on) to get laminar flow for good air removal.

brass thing

@ April 8, 2012 2:09 PM in Little Brass Cup-shaped thing above expansion tank is leaking

This air removal device. I always leave red cap loose, or remove it at all. If it leaks, replace it.

public and spec build jobs

@ April 4, 2012 11:28 AM in Happening elsewhere?

here is a very interesting article regarding spec build work, and i think this is why high efficiency heating will never work on public and spec build jobs.

Contractors Do Whatever They Want


by Ron Roberts
www.USCTCA.com
www.ContractorsBusinessCoach.com

Deviating from plans and specs is common practice. The only instance that I can imagine a contractor not deviating from plans and specs is Corps work.

There are two primary reasons contractors deviate from the approved work scope.

1. The plans & specs are stupid, in error, in complete, or internally conflicting.
2. Nobody is playing cop with the field crews.

Reason number one should be self-evident to anyone who has looked at plans and specs closely. They were getting bad back in 1994 when I walked away from an engineering firm. When I next laid eyes on them next in 2005 I about fell out of my chair laughing. They were ridiculously shoddy.

Architects and engineers throw details on drawings and requirements in specs just in case they are needed. Nine times out of ten, the details conflict with each other and / or they are completely inappropriate for the building being delivered.

I don't blame the designers for this sickening trend. It's driven by the fee reductions and the errors and omissions liability claims forced on them by owners.

Contractors are forced to use their best judgment or do whatever they want. Option number two is available as NO ONE WATCHES THEM.

Back in the day owners paid design teams to spend considerable time on site making sure the contractors built the job right. That doesn't happen much anymore. General contractors certainly aren't going to make sure their subs do their work by the letter of the law. GCs are more concerned with getting the job done quickly and getting out of there.


Wishing you great success in 2012.

Guy and Ron

P.S. Want your business to grow fast? Put our
solutions into action. RISK FREE! Check it out here.

P.P.S. Questions or comments? You can reach
Guy at 773-870-6500 or Ron at 913-961-1790.

The Contractors Best Practices Newsletter is written
and distributed by Ron Roberts & Guy Gruenberg,
www.USCTCA.com
www.ContractorsBusinessCoach.com
-All Rights Reserved


I did not post article fully, as the rest is not much relevant to the topic, but I reprinted it in full with author permission on my blog.

design temperatures

@ April 4, 2012 9:15 AM in Happening elsewhere?

This is the reason we do design build only. I found complete lack of knowledge and inspiration in regards to high eff heating in engineering community.
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