From: theise@panix.com   
      
   On Tue, 19 Nov 2024 11:48:15 -0600,   
     sticks  wrote:   
   >  On 11/19/2024 9:19 AM, Ted Heise wrote:   
      
   > > I may have alluded to this before, but last time we camped on   
   > > a flatspot in our Lance 1475 the night temps dropped into the   
   > > 40s or 50s and I had trouble running the furnace on 12 V.   
   > > It's a Truma Combi Eco Plus; the gas would fire up and the fan   
   > > would run for a minute or two, then stop--without having   
   > > brought the inside temp up to the thermostat setting.   
   > >   
   > > You may recall that this unit was replaced under warranty   
   > > earlier this year (due to E6H error codes suggesting   
   > > combustion air motor problems).  But this more recent behavior   
   > > doesn't seem connected.   
   > >   
   > > As near as I can tell, the unit should run on propane with 12   
   > > V power for the fan.  The battery was at full 100 Ah capacity,   
   > > so it wasn't a low charge state.  I'm wondering if being LI is   
   > > a factor, for example is it possible there is internal   
   > > resistance in the battery that limits the current?  Seems   
   > > crazy, but I'm not sure what else to think.  FWIW, it's a Li   
   > > Time battery (from China), and has worked as expected or even   
   > > better.   
      
   >  If the furnace actually operates as it should when it is   
   >  running, I would first think about the thermostat.  For   
   >  example, I would try and raise it higher to see if it runs   
   >  longer and then shuts off still without reaching desired   
   >  temperature.  If it still does this, I would be interested in   
   >  finding out where the probe for temperature sensing is located.   
   >  It might just be too far away from the thermostat, and too   
   >  close to the hot air vents.  This unit has a setting for   
   >  temperature offset for RV's where this is an issue.  If the   
   >  furnace shuts off 5 degrees before desired temp, you adjust the   
   >  offset by this amount.   
      
   Thanks for the thoughts, but I'm a bit skeptical of that   
   possibility because it ran fine once I fired up the generator.   
   My bad for not mentioning that bit.   
      
   --   
   Ted Heise             West Lafayette, IN, USA   
      
   --- SoupGate-DOS v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)