Small Munchkin Problem

Paul Rohrs

We are currently in the process of correcting some small problems with an M80 Nat Gas Munchkin with the Vision 1 package.

I worked with Guy and a couple other tech's at HTP today and they helped put us light years of where we were when we started. I will call them again tomorrow if nothing else works.

We were continually getting an F09 Failure for Ignition error code. The boiler has been installed since October and has about 1200 hours logged on it. Now, it was not lighting off. Working with the factory, we now know that our CO2 and O2 levels were way way off. We had a Testo 325m on it to monitor it today and brought the CO2 up to 9.7 and the CO up to 103. After we brought it up to these levels, the F09 codes went away.

The problem is that after the DHW satisfies on High Fire, we resume space heating (Zoned by Circulator) and after it resumes at low fire, we are getting some ultra loud harmonics that reverberate through the house. I called HTP again and it was then that we were advised to turn the offset screw 18 turn. (I now understand what it is for). Matt J was the tech on-site and after we made that adjustment we brought the CO up to 129 and the O2 up to 9.9 and we are still getting the harmonics.

Honestly we are heating fine, but when resuming low-temp (reset) space heating the harmonics only last a short time until (a minute or two) the fan speed ramps up a bit.

Again, we are pretty happy with the product but this particular boiler is being really finicky. Oh, the other thing is that we have the PVC Concentric vent on it and it is all clear. We have 8"of WC and are only dropping to 7.5" when opening the Gas Valve.

Any of you had this problem? How did you correct it? Can't wait to get this thing "dialed-in" and let her run.

Matt J can post if there was something I left out.

Regards from Nebraska,

PR

R. Swatton

Still a gas valve adjustment.

Call Guy again and he will walk you through it.

Rich

Jared M

We had the same thing on an LP fired 140M last year. The offset adjustment was the cure. Check back with HTProducts tomorrow and they can walk you through it.

Funny thing about that job was that we replaced a HydroPulse. The owners were really looking forward to a quiet boiler and then we started it. They heard that harmonic 'moan' and I got some mean looks until we got it straight!

-Jared

hr

I've had a 199 and

now a 140 that had F09 problems. Both have been installed about a year. The offset adjustment has seemed to fix the 199. I may have to check and adjust the 140 tomorrow.

I can't understand what happens after months or a year in service that requires the adjustment. We check all the settings on start up.

Possibly fuel quality calorific content change? I've heard an auto adjusting gas valve, of some sort, may be in the works?

I know the contractors in Utah are pulling their hair out with the natural gas providers changing the "blend" or whatever of the gas. The gas company feels it is the contractors job to go back and make adjustments every time the jack with the fuel. Has something to do with the imported natural gas being a different value.

Apparantly they can liquidfiy natural gas by taking it down to some real low below freezing point. It can them be hauled on freighters from South America, and put into the pipe network here.

Maybe it's metric natural gas

hot rod

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