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one of the best explanation that i found thank you so much

Much appreciated to have access to this type of education. It’s hard to get this stuff all in one place these days on the west coast.

thanks for sharing all this, do you have also a book recommendation for the subject ?

This is a really good video; I have watched a bunch of them before making the decision to buy a Tekmar, but found this video after my decision. I'm going ahead with 3x 564, and 5x 561, attached to new IBL SLC, and 3x Life Breath AHU. I hopeful that the installer knows how to set this all up propertly. I think I like the idea of the room response. Overall, I learned a great deal about this system, and feel much more comfortable with my decision. The biggest reason for me was I have a Honeywell IAQ, but I could never find anyone who knew enough about the IAQ, Boiler and AHU setup - so always ginger pointing - hoping the tekmar unifies the support for the complete system. I had two AHU X10 of the 3 motors die and decided to bite the bullet and change out the complete system. Not to mention I have a Munchkin boiler that has been giving me grief for years that I was just fed up with and decided to do one entire new system. Hopefully, it pays off.

Stop clearing your throat

Nicely thought out video. The Noble is a great boiler!

Good information but did you record the audio on your toaster?

Has anyone has the issue of flame fail while running? Im going back on a Noble we installed about year ago that is having this issue. In high fire no issue but when it ramps down the flame drops out.

Can you do a demonstration on adjusting gas pressure? Maybe do another with deep cleaning a heat exchanger? Or error codes troubleshooting?

Ive been stumbling through the internet to find some good G2 info that was right to the point. Excellent presentation! Answered many of my questions. Although this is a few years old, the data you provided was very clear and precise still. Thank you and two thumbs up sir.

GOLD!

Great video thanks

I'm still confused about how the flow in a secondary circuit can exceed the primary supply. I'm probably confusing volume with flow, but if a primary loop is only supplying 50 GPM of water, how can a secondary pump increase or accelerate that to 100 GPM when the quantity/velocity of water behind it in the supply isn't sufficient to meet the call? Wouldn't that create a massive vacuum behind the tee since their would be a shortage but there's no air to create a void? I mean, I heard your explanation that 50GPM backflows through the common and joins the original 50 GPM that entered the tee initially, I'm just still confused lol.

Thank you so much ... ex plumber who is retired have a combi installed 4 years ago and need to service. Thank you

The principles of modern hydronics still date back to this man’s findings. Thank you Gil for your massive contribution to this industry and may you rest in peace

The fact that this video only has 1.7k views and yet countless videos on troubleshooting air and pressure related issues in modern hydronic heating systems have hundreds of thousands, speaks volumes about the state of the residential heating industry. I recently began residential service work, with my prior experience being big commercial hydronic systems and the amount of failed expansion tanks, popped relief valves, leaking auto vents, air bound systems, etc.... that have all just been excepted as facts of life with hydronic heating systems was alarming, The very first thing I noticed was nearly every single one of these systems had circulators on the return pumping into an expansion tank. Anyone that understands any basic hydronic or fluid dynamic principles can understand immediately what causes these issues. The negative pressures on the circulator inlet allow the system fill to continously add makeup water to the system, autovents draw constant air in, expansion tanks get filled with water until the bladders fail, then excess pressure exits the system through the relief valves or autovents. The effect of constantly adding undissolved oxygen into the system compounds all of these issues and creates endless issues and component wear. This video should be part of a required curriculum for any hydronic heating installer or servicemen. We need technicians that understand the theory of how these systems operate, not parts changers and salesmen of misinformation.

Just had a Bradford White combi boiler installed in my home. The plumber said I didn't need the outdoor reset even though it came with the unit. Any thoughts? Thanks ahead.

Any ever have lockout Water press switch erron lochinvar noble combi boiler?

In Manitoba you need to vent 2’ above the ground because of snow

This is amazing. So many commercial installations are incorrectly installed.

Very nice demonstration. But... what would be the point of no pressure change if there is no expansion tank in the circuit (theoritically suppose a closed loop circuit which has no heating/cooling function)?

You never explained why there is a second pump at the inlet to the boiler on the primary system?

Could you explain further how you got the C_v value of 1.7 in that last example? I'm not quite following.

Thank you so much for this video! Very appreciated and will certainly forward this to my grand children who are in the trades.

This video was amazing! Thank you for sharing this knowledge! My Lochinvar Noble boiler currently has a fail ignition fault. It's been running like a top for three years then just stopped. I confirmed I have spark. I confirmed 26 volt from the board to the gas valve. My boiler goes from pre purge, runs 26 volt to the gas valve, I get ignition (visible) for 0.5 seconds, then boiler goes into post purge and gas valve goes to 0 volt. Repeat 3 more times, error and lockout. I don't have a manometer to check the gas valve unfortunately, but that may be the culprit. Odd to me that I can see it fire through the sight glass and it still shuts off though...any ideas from the peanut gallery???

My boiler is working fine but the display screen keep rebooting itself, what’s the solution? Do I have a bad control board? @FIA_inc

Love how everyone is multi-tasking (on calls, talking to others, even watching TV) when he takes everyone off mute. 😂

I’m seen plastic venturis completely rot out anyway to fix that? Like the plastic crumbles apart

This guy having domestic disputes during this video? Thanks fukn golden 😂

Great explanation! I'd love to receive a B & G system sizer wheel if still available.

Amazing work sir

So often overlooked by building engineers. I can't tell you how many cooling towers I have seen sitting on ground level next to the pump expecting the max pump capabilities

This is amazing explanation! Are there any books or courses you would recommend for going in depth and learning about it more?

What exactly should the heat exchanger tubes look like? I did a dual fan Lochinvar and the tubes to me looked dirty. You didn’t really cover that in the video.

Im not getting dhw. At my faucets

Gil Carlson....one of the godfathers of modern hydronics

One of the benefits missed is fewer cracked boilers, especially commercial, lower operating temps and less major expansion/contraction make a huge difference in boiler life. I also think that now with higher fuel prices here to stay that ODR is also beneficial to small mass boilers and even a System 2000, I think now they say ODR can be a 10-30% increase in efficiency and that would easily pay for the ODR control in one year or less. Even with a small mass min temp of 160-170 and max of 200-210 there would be huge savings.

I'm swapping in a new primary loop calculator and that led me to thinking about my boiler short cycling a little much, so here I am looking at what outdoor reset to go with! Thanks!

I finally found a presentation that explains what the acronyms are, and what they do. Thank you. I have a stupid question that I couldn't find an answer in spite of searching the web for a week. I wonder if anyone can help. The questions is: why do I want or need a primary/secondary loop? I thought the biggest reasons for P/S were to 1) reduce the temp of the inlet water (shock to the heat exchanger), and also create a path for the boiler circulator. Well, if I ran the system temp as low as possible (based on the fact that I have 40 year old baseboards tha are not something I will replace), why do I need to reduce thermal shock? Ultimately the boiler/system pump should run 4 hours without start/stop. Low outlet temps = low Delta T. So minimal shock to the heat exchanger. Also , If I turn OFF the boiler pump, and have a variable system circulator that runs only if there is demand from the thermostat, why do I NEED a secondary loop? I presently have 8 zones, so balancing the primary/secondary for all system demands would be virtually impossible with a low loss header if you want to minimize return water temperature to condensate during low demand. The system circulator would either be overpower or under powering the boiler circulator based on heat demands (single or multiple zones demanding heat).

There's a Richardson system in my father's house. It really confused older plumbers when I would ask for help. Now I understand it very well. I have some valves saved, but haven't seen a replacement for the trap-90s.

Excellent presentation

For multiple boilers in primary secondary configuration are isolation valves necessary? or would check valve, boiler, circ etc. provide enough pressure drop to prevent flow through inactive boilers?

I hope you folks are able to start building some boilers here before too long it is cold in Alaska and there is not one boiler in our state.

Great video! I’m having issues with ignition and fan noise on my N199. Do you have a link or video of your service you talk about at the end of this video? I need to dig into mine and it would be very helpful.

That was funny in the beginning, happy wife happy life brother.🤣👍👍😂

Why does the common pipe need to be a max of 4 pipe diameters long or 12 inches? What happens if it is twice that length?

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Robb, I have a Lochinvar Combi Boiler installed and live in the Haverhill area, can you recommend a local company who services this product. Mine was installed in 2019 and the contractor who installed it is no longer in business. I am having low flo issues with the DHW.

Hi, where we have 2 boilers, 1=Master and 1=slave connected to master by cascade shield cable, anyway we need 2 controll card and install in both or just in master boiler?

The first book I read the hydronic analysis looking to learn about hydronic testing and balancing. It was so great I couldn’t even understand at the time. This is someone I was so proud to learn from. My teacher Tom also loved his book. 🙏 gave me so much confidence.