My Exploding Boiler Delayed Ignition Flame Rollout Testing Gas Pressure
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- čas přidán 19. 03. 2020
- My boiler has an ignition issue which causes an occasional backfire/ exploding on start up. This was happening I noticed when I moved in the ignition problem. It would spark at times longer than it should. Yet always fire up and come on. Therefore I ignored this and continued getting the house ready to move in. One day I was by the boiler and witnessed a backfire and flames came out from under the boiler about 1-1/2 feet in front of the boiler. I couldn't replicate. It kept lighting up. The next day I decided I would test gas pressure. Then do a good boiler service which video will be published soon. I need to verify I have good gas pressure in and out of my gas valve to burners. I test the boilers had pressure with my Magnehelic gauge and digital fieldpiece odometer.
- Zábava
I knew it wouldn't take long for you to start servicing that boiler. It's from the early 90's? About 25 years old? Ah, the joys of home ownership. Your doing a good job getting the new house ready for your family.
This house is non stop work yet one day I will catch up. I have videos on another channel ADHD Mechanical on some of my projects. It's nice to be moved in.
Saw something similar from a unit where the heat exchanger coils were all full of soot. I know that this boiler was big enough that when it was first started it would literally rain inside of the boiler when it started to come up to temp. It's really weird when it happens though. My best guess is that when that would happen it would get some soot going and that ended up depositing on the coils plugging them up.
I didn't own the building but helped with some of the stuff when there were issues. I had actually moved and got a call from the owner begging for help to try and figure it out. Drove an hour to help because the building was basically without heat at that point.
Thanks for more house videos great Hacker !!!
It’s supposed to do that, it’s to keep spiders from getting to close
Nice video thanks for sharing. I liked that custom adapter for manometer port, how did you make it?
Lol I use my refrigeration fieldpiece temp clamps on boilers all the time, love them,
Haha gotta love exploding gas appliances. Happened to me once on a reznor unit while I was 30ft up on a scissor lift. Scared the hell out of me 😂. Maintenance guy had replaced the gas valve, had the gas turned way to high, and had cracked the gas pipe just after the threads on the outlet of the GV. Neglected to tell me anything about any of that, just that it was having problems. I flipped it on and that thing managed to rollout far enough to light the gas on the cracked gas line. Learned some lessons that day. 🤣
PrestoWind sure is, I don’t really even like being in a lift at 30ft 😂. Feels so unstable
That was why I started with checking gas pressure before anything else. Especially with a newer looking gas valve
The HVAC Hacker 👍 I have since then
Gas pressure in the lines is still low at 4.6", I would adjust that outdoor regulator to about 7" wc. Gas pressure in the system should really be in the range of 6-8" wc at all times for gas valves to open, close, and regulate properly. Low input gas pressure can cause the gas valve to open too slowly and that might be the cause of your flame out because the gas velocity is too low in the venturi.
Half of your statement is true. According to the video, his input pressure is 5.6, and output 3 something or 4 something. If nothing else inside the house is on, he shouldn't have an issue (if his broiler is at the end of the line.) Usually most appliances use between 3-5 pressure. Of course, 5.6 before appliances thru out the whole house is low.
Does that boiler take a slow opening valve?
Pressure probably isn’t da cause
Please take a good look at pilot
Maybe a new pilot assembly
Or remove and clean
I’ve seen this due to damaged and or bent pilot assembly
Once or twice
Smooth ignition once pilot is ok 👍🏻
I fixed it in this video czcams.com/video/XF026HJbpKE/video.html . I just wanted to test my gas pressure and verify what it was. Before doing anything else. The next part was filmed at same time as this one. I put testing the gas pressure separate from performing a good maintenance.
Nothing beats a mechanical (analog) gauge to see rises and falls whether it’s pressure , temperature, voltage , current , etc. A digital meter simply cannot display fast enough to accurately show subtle changes.
I learned that years ago troubleshooting a gas gun on an oil boiler converted to gas. pressure switch was 0.15"w.c. my digital missed the fluctuations. I condemn the pressure switch. replace the same thing. put Magehelic saw functions, open-air baffle, no more pressure switch problems. Digital is good when just checking pressure.
We don't like to call it "exploding" - we use the term: hard start!
Delayed ignition from pilot burner position or small pilot flame.
I had an exploding gas oven like that. Turn it on, wait almost two minutes and BANG. Had two issues, low voltage coming into the house around 99-108 volts and a bad hot surface igniter. Gas scares me.
This boiler was never worked on other than the gas valve replaced and a zone valve. Factory burner wires to hold them in place for shipping had to get cut.
I have that problem now, I replaced the bad igniter and put in the new one, and now the oven makes a loud bang and slightly opens the oven door. It only does that at the beginning of the preheat once the oven is up to temperature. It’s like the oven is turning to gas on too early before the igniter has a chance to get hot enough!
It farted. Had a exploding heater in my parents house growing up. Was in a closet right next to my bed. The fan would make noise then kaboom. Didn’t sleep much lol
External combustion boiler
Thats for sure I should set up an external heat exchanger and blower
must be nice to be able to diagnose your own stuff
Yes except no time to work on it. I was trying to get house ready to move in. Soon I will have time
You got to buy lines pre filled with vacuum.
I had the same problem and replaced the electronic spark ignition to a standing pilot system and the delayed ignition does not happen anymore.
delayed ignition happen when the port of the burner near the ignitor or pilot is clogged, or just build up white ash that pushing gas away from the flame for a second. With that much of gas come out, a slight delay will cause flash back like that. Unless you upgrade the board with spark assist (which include flame sensor) Which cost money. A simple cleaning at the burner and pilot head its all required. Most tech out there trying to make small issue looks big to put in the sell that's all.
In this case, he does his own work just to get experience I guess. Which perfectly fine. That's how we learn back in the old days. We play around with stuffs up to gain knowledge. Knowledge ain't cheap most of the time.
Water manometer never out of wack
Pilot tube maybe too small or might be some dope in the orifice. I've run across that a couple of times this past season where the pilot was delayed ignition because the guy before me used that little 1/8th line and it needed a bigger one, and another where they doped the fuck out of the ferrule and it ended up causing a partial blockage.
Couldn't get to the orifice. This video I pushed out first. To cut down the maintenance vid. Only spoiler I will give is the burners still had factory wire holding in place. Also, I did verify the pilot tubbing is correct size. Orifice I couldn't access
@@thehvachacker so if those burners have never been pulled, then ots a safe bet the outlets are clogged to shit. Thats always fun lol. I await patiently for the maintanence vid to conform my speculation lol
I have a situation the boiler comes on but the flames coming outside of the boiler is it possible that my chimney is clogged
Yes or heat exchanger is all sooted up. Is it a second roll out like in this video? Or it rolls out the whole time
That's funny i have the same one and i just cleaned it up real good because it was doing the same thing. Any suggestions? Mine has been in this house over 50 years.😰
Time for a new boiler.
Could be a problem with ignition module, gas valve, or pilot assembly, the cleaning I did heat took care of the exploding problem. Yet I am now correcting a hi co in exhaust problem
@@thehvachacker yes i have to break down the whole unit to clean in between the chambers that should help with the exhaust.
Don't be to harsh on people named Eddy ... Lol ... Good vid Bill ...
I just wish I could clean that off my boiler. More vids on way from this
@@thehvachacker lacquer thinner will take off that sharpie ink. Take the cover outside (away from that flame) to clean.
#90 thumbs up
Never adjust the gas pressure at the service regulator on the meter manifold,there could be another issue like a plugged or restricted regulator vent,or a problem internally.Call the utility company,they will change the regulator.We have had people turn up pressure on regulators and when an ice plugged vent melts you now have over pressure to the appliance regulators inside.
Wouldn't the ice plugged the vent regardless what the actual pressure? If you (know what you are doing, and how doing it) adjust the pressure, then the pressure just goes up to the right pressure (without damaging it). Sure, to be safe call the utility company out and fix the issue. But yes they come out and adjust it without replacing the new one. Nothing come out from manufacturer perfectly. Reason why there are tech whom know what they are doing to fix the issue.
I worked for a gas utility for 25 years,it was extremely rare to adjust a residential service regulator.The usual problem was low gas pressure from a variety of internal problems or the vent.By cranking the regulator down to get more pressure without knowing you don’t have something else going on is risky.Another issue was people turning the gas service valve (at the meter manifold) on too fast and damaging the diaphragm,especially in cold weather.There is usually a sticker on the meter warning of tampering with utility equipment,why risk it,come back after the gas co.gives you 7”WC from the reg.
I had a Utica boiler yesterday that did the same thing to me it was propane I had a bad gas valve valve was leaking by found it with my sniffer thru offices draft damper was in manual so customer did not smell gas
Did you pick up any gas pressure to manifold when the system was off? This system has a pilot burner and main burner. The pilot wasn't sending correct signal. Yet more troubleshooting coming
@@thehvachacker just leaking gas into 2 offices of the three customer said they were using alot of gas I suspect valve was leaking more sometimes this unit had intermittent pilot I could not find it with bubble only with sniffer they claimed 200 gallons of l.p. 3 weeks lucky unit did not explode also who ever put that damper in manual probably saved them this unit was in a room that was lower than rooms around it anyway I enjoy the videos we see alot of same stuff out there our company sells oil and we do plumbi g heating and a.c. residential and commercial in ct
I don't buy the 200 gallons leak in 3 weeks, it would have pooled the basement/house full and left nothing but debris, even with an open damper and good draw, propane is just too dense compared to air.
@@throttlebottle5906 ya that is what they said and yes propane heavier then air crazy propane company told them to call a service guy and not test themselves before leaving house
And they only bought house 1 moth ago just moved in 1 week ago
Had a 3 Million BTU boiler at Bayonne High school blow up on me once. The pilot was being pulled away from the main gas jet enough to satisfy the flame sensor but not light the main so the whole chamber filled from back to front and BOOM!!! 8” gas line.. I ran a soon as I heard the valve click but no ignition.
wow
where you ok when that happened
Did you buy a new house?
Yes back in December. Moved my family in March 1st
Kool Beans
What’s wrong with that that’s how you know it’s on
Ok
Clean the burner check the pilot
Bad draft or dirty burners ,you didn`t show the flames then running blue or yellow, that should have tripped the roll off switch but it didn`t.
Had a steamer the first startup in morning would do that but after it warmed up the draft was good.
a quick flash like that wont trip a roll out, it takes some time to heat the bimetallic disc until it trips it.
I see you bought in radon country...
Yup Waldwick.
Yikes. Only 4% of the houses tested have come up above the threshold in Waldwick.
Try the luncheonette across from town hall. Nice place.
Stay safe
Haha everyone jumps sometimes
It happens in a few of my vids.
Expansion Tank upside-down
Can be installed in any position. A rubber diaphragm separates the air and water inside
@@thehvachacker "No" Read the installation instructions
My munchkin does this randomly. Really load though.
sorry but how don't you have time for this? if you dont have time take the day off. or hire someone even though its your own profession. exploding boilers is high in the priority list.