Munchkins on propane

Derrick Ellefson

Sounds like you have your bases covered. Most of my problems have had to with condesate removal, combustion set up wrong or reculating combustions gas. I would look at your outdoor termination How are these boilers staged and controled.

Bill de Jong

Just what we all need, more about Munchkins!Anyhow, let me throw this out to all of you Wallies and see if you have run across this problem:
I am involved in an installation (I am the designer and wholesaler) with two 199M Munchkins being fired on Propane at an installed elevation of about 3500'ASL. The installation is a residence with three Fancoils and a SuperStor SSU119 Indirect Heater (I know, I know this is a high-temp system, and the use of the mod/con boilers is not utilizing maximum efficiency!). Our problem is this; the boilers have had to have their heat exchangers cleaned three times in the last year. The deposits are the sickly greenish-white deposits normally seen on the the flue-passages of non-condensing boilers. The boilers have been setup countless times with a Testo 325 analyser and have never had the brown pebbles normally found on Natural Gas heat Exchangers. The drains have been checked and cleaned thoroughly. While we are aware that boilers with this style of heat exchangers require more maintenance, this is a bit much. Any ideas, folks?

ALH_4

Combustion air

Is there any possibility of contaminated combustion air? I assume the gas pressure been checked?

Derrick Ellefson

Bases Coved

Sounds like you have your bases covered. Most of my problems have had to with condesate removal, combustion set up wrong or reculating combustions gas. I would look at your outdoor termination How are these boilers staged and controled.

WaterHeaterGuy

Hmmm

First let me start off by saying that I don't have any high altitude models in my territory so there may be some nuances related that I am just not exposed to.

That being said if I were to see that down in my neck of the woods I would be suspecting a re-circulation of flue gases or possibly exhaust being back drafted through the unit after the flame shuts down.

Is there any evidence of corrosion inside the cabinet? Does the gas piping look as good inside as it does outside the cabinet?

Al Corelli

Propane?

Is the propane regulator large enough to handle both boilers?