From: aruzinsky@general-cathexis.com   
      
   On Sunday, December 18, 2016 at 3:08:06 PM UTC-6, Poutnik wrote:   
   > Dne 18/12/2016 v 16:28 aruzinsky@general-cathexis.com napsal(a):   
   >    
   > >    
   > > I doubt it because the ODS is the cause of the flame change of the pilot.    
   If the ODS is both cause and effect of flame change, that would imply   
   feedback  which would likely lead to unwanted oscillations.   
   > >    
   > I have just guessed from the picture.   
   > It does look like there is a flame feedback sensor.   
   > But it may be the same safety switch as is in the ovens.   
   >    
      
   If you mean the thermocouple, yes, that generates electricity that holds a   
   solenoid valve open that supplies gas to both the pilot and the burner, but,   
   that is not part of the ODS. The ODS either bends the pilot flame so that it   
   misses the thermocouple    
   or completely extinguishes the pilot flame.  In either case, the thermocouple   
   becomes cold thereby turning off gas to both pilot and burner.   
      
   Yesterday, by trial and error, I fixed my Mr. Heater MHVFB10NG by covering   
   about 75% of the air inlet hole on the pilot tube with aluminum tape.  I also   
   repositioned the thermocouple about 1/8" more into the pilot flame, but, I   
   doubt that that was    
   necessary. I am still uncertain of the ODS mechanics, but, I suspect that it   
   may be as simple as follows:  The air inlet hole on the pilot tube is of   
   maximal size such that, with normal air, the air/fuel ratio sustains a pilot   
   flame (if the air hole were    
   slightly larger, there would be no flame).  If the oxygen content in the air   
   drops enough, the air/fuel ratio remains constant but the pilot flame goes   
   out.  And, if I my theory is correct, the incremental cost to the   
   manufacturer, over making a    
   conventional pilot, is zero.   
      
   Anyway, I fixed it in the nick of time because the outdoor temperature dropped   
   to -10 deg. F. last night.       
      
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