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Re: Navien NCB 240 flame loss (error 12)
Hi. Problem resolved! We replaced the dual Venturi gas/air mixer. It is located on the left side upper section. It is the housing that the gas and blower connect to. It has a small motor that must be bad. 
System works great now.

System works great now.

2
Re: CO2 - AirThings Monitor & Atmospheric Boiler
@Jamie Hall I updated the photo, this really is CO2, not CO. The AirThings monitor is in the finished part of the room.Exactly.
Are you suggesting that perhaps it is because air from other parts of the house is being pulled downstairs and thus increasing the CO2 while the boiler is running? I hadn't thought of that.
Re: Rinnai Tankless WH
@Tberg2374 You don't mention any codes showing up. Usually, if you are not getting what you ask it shows a code.
This leads me to believe that there might be a installation issue not related to the water heater.
You might want to the dip switch settings.
This leads me to believe that there might be a installation issue not related to the water heater.
You might want to the dip switch settings.

1
Re: Welded 6 inch header
The pattern I have seen with the Weil Mclain LGB steamers, which seem very sensitive to welded headers, is that boilers with welded offset 2 riser headers last about 14 years. Failure mode is almost always leaks between the sections at the seals. Boilers installed with 2 threaded risers and headers or smaller single risers sizes last about 24 years. I consider a 14 year life unacceptable and only the rich can afford the cheaper welded installations. On large boilers we use a welded header but with threaded drop risers, which allows all sorts of expansion and contraction. Also, the header drain and return going back into the boiler needs to be threaded in order to make this corrosion prone piping easier to replace in the future without the huge set up fee for a certified welder. Many installation diagrams also show required threaded joints here also so expansion and contraction of the piping doesn't stress the castings.
Re: Gravity supply tank replacement
I was surprised to see it even had a pilot safety on it under the burner cover. use to see the old valves with even a manual open lever. Ha, that was not such a great idea. That is as simple as it gets boiler. We just re worked some gravity piping for a house last week. Was not working well until we re routed a pipe and flushed the partly blocked underground return. Cool old beasts. She might want to have someone add a low water cutoff to the old beast.
Re: Correcting the code inspector
In New York State the local building department has to petition the state to exceed the standard code. The form they need is attached.
Department of State
Division of Building Standards
and Codes
One Commerce Plaza
99 Washington Avenue, Suite 1160
Albany, NY 12231-0001
Phone: (518) 474-4073
Fax: (518) 486-4487
www.dos.ny.gov
Notice and Petition Relating to More Restrictive Construction
Standards (Uniform Code – Executive Law § 379
Department of State
Division of Building Standards
and Codes
One Commerce Plaza
99 Washington Avenue, Suite 1160
Albany, NY 12231-0001
Phone: (518) 474-4073
Fax: (518) 486-4487
www.dos.ny.gov
Notice and Petition Relating to More Restrictive Construction
Standards (Uniform Code – Executive Law § 379

1
Re: Correcting the code inspector
One of my best stories happened when I was 19. I have been doing this working for the family business for as long as I can remember so I had a lot of experience under my belt at this point but I looked like I was 15.
Some back story: My city went through a brief period where the AHJ decided that we were not allowed to use unions on gas lines any more, instead we were required to use LR nipples and couplings. No idea why and it was changed back the next year. We had installed a buried gas line (PE with anodeless risers) from the meter which was at the street to the house ~20'. Got an inspection with the line under 20 PSI and now had to get a final inspection with the line connected back to the house. I made two swing joints with 4 90's and some nipples and the LR coupling and nipple in between the two sets of 90's which allowed me to start the threads and tighten the coupling and everything pulled straight once the LR coupling was tight. Painted it, turned the gas on, checked for leaks, lit pilots and waited for the inspector.
He shows up and it was his second day on the job and boy was he an arrogant son of a......
He walks up to see little 19 year old me standing proudly next to my work.
Now at this point I have to tell you that the LR couplings that were being sold at my supply house at the time did not have hubs, they instead looked like thread protectors, except they had a big 'LR' stamped in the side. They were proper couplings with tapered threads, they just looked weird.
So up walks this inspector doesn't say a word just stares at the piping scowling for a good 2 or 3 minutes from 10' away. Finally he looks at me and says "Well, thread protectors are not allowed to be used on gas, but I'll let this one slide." To which I respond "That's not a thread protector its actually a LR coupling see? (pointing to stamp on coupling) anyways I wouldn't have been able to get this together without using a LR coupling and nipple." and being the little **** that I was (am?) I then said "so you would let a thread protector go? to my knowledge they have never been approved as fittings because the lack of tapered threads does not make for a good seal." He angrily scrawls a signature on the inspection ticket and walks off without saying a word.
He had so many complaints filed against him that he was taken out of the field after about two months. I heard though I never confirmed it that he threatened to call our local utility and request that they interrupt electrical service to a house undergoing a bathroom remodel when he walked in to do the rough inspections and saw an outlet without a cover on it in a room not associated with the remodel that the HO's were getting ready to paint. Gotta wonder sometimes.....
I think that most inspectors are doing a hard job as well as they can. I always try to be on site when the inspector is there to answer any questions and solve any problems right away. There are a few that I have seen though that just want to be "right" and are doing the job because they get some weird power trip from it. Those can be difficult to deal with, but it is usually an easy call to ask them to give you code citation for their requirement, or as SWEI says go a couple rungs up the ladder and it is solved easily.
Some back story: My city went through a brief period where the AHJ decided that we were not allowed to use unions on gas lines any more, instead we were required to use LR nipples and couplings. No idea why and it was changed back the next year. We had installed a buried gas line (PE with anodeless risers) from the meter which was at the street to the house ~20'. Got an inspection with the line under 20 PSI and now had to get a final inspection with the line connected back to the house. I made two swing joints with 4 90's and some nipples and the LR coupling and nipple in between the two sets of 90's which allowed me to start the threads and tighten the coupling and everything pulled straight once the LR coupling was tight. Painted it, turned the gas on, checked for leaks, lit pilots and waited for the inspector.
He shows up and it was his second day on the job and boy was he an arrogant son of a......
He walks up to see little 19 year old me standing proudly next to my work.
Now at this point I have to tell you that the LR couplings that were being sold at my supply house at the time did not have hubs, they instead looked like thread protectors, except they had a big 'LR' stamped in the side. They were proper couplings with tapered threads, they just looked weird.
So up walks this inspector doesn't say a word just stares at the piping scowling for a good 2 or 3 minutes from 10' away. Finally he looks at me and says "Well, thread protectors are not allowed to be used on gas, but I'll let this one slide." To which I respond "That's not a thread protector its actually a LR coupling see? (pointing to stamp on coupling) anyways I wouldn't have been able to get this together without using a LR coupling and nipple." and being the little **** that I was (am?) I then said "so you would let a thread protector go? to my knowledge they have never been approved as fittings because the lack of tapered threads does not make for a good seal." He angrily scrawls a signature on the inspection ticket and walks off without saying a word.
He had so many complaints filed against him that he was taken out of the field after about two months. I heard though I never confirmed it that he threatened to call our local utility and request that they interrupt electrical service to a house undergoing a bathroom remodel when he walked in to do the rough inspections and saw an outlet without a cover on it in a room not associated with the remodel that the HO's were getting ready to paint. Gotta wonder sometimes.....
I think that most inspectors are doing a hard job as well as they can. I always try to be on site when the inspector is there to answer any questions and solve any problems right away. There are a few that I have seen though that just want to be "right" and are doing the job because they get some weird power trip from it. Those can be difficult to deal with, but it is usually an easy call to ask them to give you code citation for their requirement, or as SWEI says go a couple rungs up the ladder and it is solved easily.

1
Correcting the code inspector
About a year ago I was having dinner with an engineer who worked on a number of large commercial projects in the New York metro area. He mentioned that he sometimes had a code inspector ask for changes which weren't required by the code. He said he handled this by asking the inspector for a code citation because the company required that he give a citation for any work order for changes. The inspector invariably backed down after consulting the code.
How often does this situation happen to you folks? How do you handle it?
How often does this situation happen to you folks? How do you handle it?

1