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gennady

gennady

Joined on January 27, 2011

Last Post on August 30, 2014

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"output temp diff"

@ March 15, 2012 7:30 AM in Lochinvar Knight boiler problems

if water flow is not sufficient, at minimum load water is overheated and temperature difference on inlet and outlet of the boiler increase to much and too fast. boiler control protects heat exchanger and locks out. expansion tank and boiler feed line connected in wrong locations. boiler is over sized at least 3 times. and person installing it has little knowledge in those systems. Find a good contractor in your are to clear this mess. it is not a matter of problem within installation, this is a problem with whole installation.

7 zones

@ January 24, 2012 8:39 AM in HELP!!! Seven zone hydronic conversion.

It is very easy to do. install danfoss valve on each zone, and bypass line of the zone with balancing valve (just in case you will need it). 

green taco

@ December 26, 2011 9:48 PM in Still getting some circulation noise.

Green taco pump appears to be pumping  from top to bottom direction, and it will be air bound, also it appears that it is pumping into expansion tank. expansion tank with feeser line must be connected to tee on the top of the boiler where pumps inlets connected. but it is also a boiler discharge, so it is wrong place for placing pumps or exp tanks. this is just my opinion. this is highest temperature in the system and you made it lower pressure point by making it suction for the circulators. Not a good combination.

green taco

@ December 26, 2011 9:48 PM in Still getting some circulation noise.

Green taco pump appears to be pumping  from top to bottom direction, and it will be air bound, also it appears that it is pumping into expansion tank. expansion tank with feeser line must be connected to tee on the top of the boiler where pumps inlets connected. but it is also a boiler discharge, so it is wrong place for placing pumps or exp tanks. this is just my opinion. this is highest temperature in the system and you made it lower pressure point by making it suction for the circulators. Not a good combination.

piping

@ December 26, 2011 7:27 PM in Still getting some circulation noise.

Hello, in my opinion it is very wrong. feeder and expansion tanks must be installed in point of no pressure change, 12 diameters of the pipe must be straight on the pump discharge and so on. you will have re-do all piping.

delta T

@ December 21, 2011 7:56 AM in Condensing Boiler cycle times

Sure these are right for the job. just when it will go to low RPM, you might have water distribution problem. I prefer keep flow at optimum, (auto adapt)on VFD pump like grundfos alpha, and control water temperature with mixing valve with outdoor reset, like taco mixing valve. http://www.taco-hvac.com/uploads/FileLibrary/100-19.pdf

minimum load

@ December 21, 2011 7:47 AM in Condensing Boiler cycle times

You are absolutely right. if boiler oversized, it will cycle no matter what.  He need buffer tank in this case. One thing surprise me, is where the hell is installer ? Why he is out of the picture?

boiler load

@ December 21, 2011 7:41 AM in Condensing Boiler cycle times

If you do heat load calculation, and sized boiler to the load , then you should not have these conditions. If boiler is too big for the load , then you absolutely need buffer tank to decouple boiler from the system. end then you should separate high and low temperature zones.
regarding lowering boiler firing rate to 55%, did you also lowered boiler firing rate at low fire, or only cap high fire?
could you post photo of your hydrolic separator or 2 tee arrangement?
Also, what pumps is installed on primery loop?
where point of no pressure change located , on what loop?

zoning

@ December 20, 2011 10:29 PM in Condensing Boiler cycle times

did you pipe your boiler in primary / secondary loops?
did you install mixing valve for low temp zone?
there is no reason to derate boiler, as what matters in your case is boiler stability on low load.

circulator

@ December 20, 2011 8:36 AM in Condensing Boiler cycle times

you have to increase radiation as much as possible . do not install smaller circulator, you can either install circuit setter or VFD pump.
let me know what you decide to do and how it works i n regards boiler settings

building type

@ December 19, 2011 10:18 PM in Condensing Boiler cycle times

The last job we did was a 18 apartment building. and it worked pretty well. As per different loads, i would use VFD pumps coupled with mixing valves with outdoor reset. (or VFD pumps with outdoor reset),  it allows to set different curves for different parts of the building. but the concept is the same, working only on outdoor reset, and loading  boiler all the time, assuring continuous operation at low water temperatures.

zoning

@ December 19, 2011 9:59 PM in Condensing Boiler cycle times

Yes, you are right. I had made my share of mistakes and learning as I go. The job in the picture was the last one I did with zoning , but I like how it feels and looks. The other one has no zoning, as well as many others. This is Viessmann Vitodens 200W. No zoning.No thermostat. Happy customer.
i abandon zoning for all types of installation. I picked this old strategy from times I had worked at district heating power plant with outdoor reset.  It is very old idea, and works very well with all types of installations

delta T

@ December 19, 2011 8:07 PM in Condensing Boiler cycle times

you have to have 20F temperature difference between water temparture  to radiators and from radiators. if you have it, you are OK. system circulator must run continiously, exept when boiler is on DHW call.

zoning

@ December 19, 2011 7:48 PM in Condensing Boiler cycle times

Abandon idea of zoning. in high efficiency zoning and setbacks are bad habit, leftovers from old heating ideas

circulator

@ December 19, 2011 7:45 PM in Condensing Boiler cycle times

As long as you used primary/secondary piping arrangement, you will be fine, you do not need to change anything. Just do water treatment and cleaning, use x400 centinel for initial cleaning, combined with water filter installed at boiler inlet, then after filter will be clean add x100 once a year. read instruction on the tube. You can leave your existing system as is. no problem

details

@ December 19, 2011 7:44 AM in Condensing Boiler cycle times

water reference point establishes minimum water temperature.
curve # is picked based on design outdoor and design water  temperature.
you pick one from diagram on page 34 in manual. you want to pick one, that shows 180F water temperature (design water themperature) at design outdoor temperature, design outdoor temperature  you can get from google search in various publications.

outdoor sensor

@ December 19, 2011 7:21 AM in Condensing Boiler cycle times

outdoor sensor location is extremely important, as this sensor becomes your thermostat, you want it not to be affected by heat sources and wires must be run at least 12" away from any other wires. as electromagnetic fields will affect its reading. do not forget to activate sensor in menu. In address c-t pick option 1

settings

@ December 19, 2011 7:07 AM in Condensing Boiler cycle times

then set reference water point to 110F and pick reset curve to 1.8 ( it depends on locality design temperature, i gave you general curve number for NYC, it might differ in your location) for beginning, and set your thermostats to 88F, this will disable them. do not use night setbacks, make sure outdoor sensor activated and installed on north side , away of heating sources. You will be amazed.  

cycling

@ December 17, 2011 7:21 PM in Condensing Boiler cycle times

You need no cycling. Boiler should work non stop . you get reset curve from heat load calculation. flow must be constant, temperature must follow reset curve. the lowest temperature you get, the better.every time boiler cycles, you lose efficiency. get rid of your thermostat and zoning. Also, do not change water temperature reference point, unless you running baseboard or cast iron radiators,  change reset curve number  , page 33 of the manual, parameter os. and look at page 34 for reset curve setting.

SPILL SWITCH

@ December 10, 2011 10:06 PM in Gas flue back pressure at start-up in Massachusetts

In gas fired boilers with barometric draft regulator, damper must swing both ways and spill switched mounted on the bottom of the damper. No way you can get rid of the spill switch. you can install motorized damper down flow of draft regulator, along with proof of opening and filing with authorities having jurisdiction. BTW, is it teflon on gas pipe tread?

copper

@ November 27, 2011 9:44 PM in Please, check my work, vent question

I think you cannot have copper on steam system.

ultra wiring

@ November 27, 2011 7:00 PM in Plumber

There is no zone 3 wiring on ultra. Boiler controls 3 pumps: DHW pump, boiler pump and system pump.  if you want to have 2 zone system, please use 2 zone controller, wire boiler switch on zone controller into  heating thermostat contacts, red on left  1 and 2.  and do not wire any system pumps into boiler panel. And please, take time to read the manual
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