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Old 04-23-2012, 02:36 PM   #1
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NTI Legacy 150 firing issue


Hi

I have a 2001 NTI Legacy 150 boiler. I recently had to change the ignitor and in turn the boiler worked fine for a week. Then it stopped working.
I went through a troubleshooting process with NTI and discovered that the Gas Valve Harness plug was not putting out 24 VDC and in turn needed to be replaced. I just replaced & tested that yesterday and it still doesn't fire up but the harness works correctly.

I have tested the MV1 and I have 24V AC.
I tested the W and I have 24 VAC.
Gas is flowing and the gas valve is clicking on & off along with the ignitor glowing red.

I have screwed in the gas adjustment screw all the way and then back out stopping at 5. Then from there 1/4 turns all the way out till I reach 8 1/2 with no success.

http://www.nythermal.com/pdfs/Trinit...cFlowChart.pdf.



Please help
Alan

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Old 04-23-2012, 02:51 PM   #2
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NTI Legacy 150 firing issue


Why did you think you needed to change the HSI?
Is the gas flowing through the valve but not igniting and then locking out or is it not flowing through the gas valve at all.

If you have the right gas pressure,(Manometer testing), the gas valve is switched to "ON" and have 24V at the MV valve terminal and no gas flowing, then the gas valve is suspect.

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Old 04-23-2012, 02:57 PM   #3
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NTI Legacy 150 firing issue


I changed the ignitor because it wasnt glowing red.
I changed the harness because the 2 outer pins weren't reading 24VDC.

When I screwed the adjustment screw all the way in and then tried the boiler there was clearly no sound of hissing when the gas valve opens. When I later un-screwed the screw to around 7, there was an obvious sound when the valve clicks on and off.

NTI's only suggestion was to have a test done with a manometer aswell.

Wish I could do that myself instead of paying someone $150.

Thanks for the advice
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Old 04-23-2012, 03:28 PM   #4
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NTI Legacy 150 firing issue


If you are getting a clicking and hissing sound from the gas valve but no ignition off the HSI, then I would be looking at what's going on between the gas and the HSI.
Is the HSI in the path of gas?
Is the HSI white hot when you hear the hissing sound?
Is there debris in the burner diffuser that is deflecting the gas away from the HSI?

Last edited by how; 04-23-2012 at 03:38 PM.
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Old 04-23-2012, 05:38 PM   #5
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NTI Legacy 150 firing issue


What is the HSI? Hot system ignition, for this reply I will go with the ignitor.

The ignitor starts glowing red before the click'n'hiss start and stops glowing red before the hissing finishes. Not that I know any difference from before.

I dont know if its in the path of the gas. How can I find out?

Supposedly my boiler doesnt need cleaning, NTI techs.

Thanks
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Old 04-23-2012, 06:35 PM   #6
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NTI Legacy 150 firing issue


HSI, yes its hot surface ignition.
I am not sure whether the valve hiss you are hearing is flowing gas or is just the electromagnet valve buzz. If you are getting a different hiss depending on your pressure adjustments then it's most likely flowing gas.
A number of folks here have reported problem HSI that glow but don't get hot enough to ignite the gas.

I think I'd recommend a tech on this one. His tools can confirm the gas flow, the inlet & outlet valve pressure, ohm test the HSI, confirm the board's correct V output to it, and manually light up the system to confirm a correct gas flame path.
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Old 04-23-2012, 06:54 PM   #7
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NTI Legacy 150 firing issue


Definitely a service call. There are many D-I-Y projects you can probably handle, but this one is going to need a pro.
Links to other DIY sites is not permitted.


Last edited by beenthere; 05-08-2012 at 04:17 AM. Reason: removed link
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Old 04-23-2012, 07:11 PM   #8
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NTI Legacy 150 firing issue


In regards to needing a pro, I have had 2 technicians/contractors ask for all the info from NTI.

Please weigh in and correct me if im wrong but i dont think the "pro's" will know better than the tech department at NTI.

Theres a list of things to troubleshoot and try, thats it.

I appreciate the help and advice and Im supposed to get a number to some specialist tech in the city.
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Old 04-23-2012, 07:13 PM   #9
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NTI Legacy 150 firing issue


Considering the cold I have been through for living here for the past week I would LOVE to know how to manually ignite it.

Please share.

Thanks
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Old 04-23-2012, 07:21 PM   #10
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NTI Legacy 150 firing issue


Unfortunately, you can not manually light that unit safely.
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Old 04-23-2012, 07:27 PM   #11
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NTI Legacy 150 firing issue


The manual lighting could happen if the gas valve is actually working and the ignition is not. The fact that you have been adjusting the valve gas pressure makes me hesitant about it. It's probably only 5 seconds of gas being blown into the burner compartment but if it's been improperly over adjusted or faulty it still might cost you your eyebrows.
Are you smelling gas when the gas valve was "Hissing"? Do you have natural gas or propane?
The manual lighting will only give you one heating run until the thermostat is satisfied or until one of the safety switches shuts everything down if you have a secondary problem beyond the ignition fault.
A photo of your boiler burner compartment would help.

Last edited by how; 04-23-2012 at 07:31 PM.
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Old 04-23-2012, 09:50 PM   #12
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NTI Legacy 150 firing issue


I went to the boiler room after having said my "prayers" and thought I would try the boiler in hopes of a little action. Turned the boiler on and the lights off in hopes of seeing the igniter light up red.

No red glow of any kind. It was glowing yesterday.

I took it out and tested for the 30 - 120 ohms and I got 158.
This is with the tester/voltmeter set to 2000m.

Put it back in and no still red glow of any kind.

Is the igniter garbage?
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Old 04-23-2012, 10:02 PM   #13
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NTI Legacy 150 firing issue


There is some variation of acceptable ohm limits depending on temp and brand. 158 ohms would be normally be considered to be toast 98% of the time but I've seen exceptions, especially on coil HSI.
Replacing a HSI with an amp draw on start up with a 3 amp reading or lower is a more reliable practice.

Last edited by how; 04-23-2012 at 10:19 PM.
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Old 04-24-2012, 09:27 AM   #14
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NTI Legacy 150 firing issue


The new igniter is on the way. Thanks for the help.
Although I would never attempt anything that could further damage my boiler, Im curious of whats the process of manually lighting it. I tried to add a picture. Basically the HSI and flame probe are beside each other pointing downwards into the chamber.
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NTI Legacy 150 firing issue-hsi.jpg  

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