With both the AC and propane running you were putting too much heat into the
system. You can also do permanent damage this way. This is a design flaw
that the system is not interlocked so the two heat sources can't be used at
once. The controls are most likely kept simple to avoid the electric demand
required on the larger units.

Dennis

>From: Paul Chubbuck <paul@TAKINGFLIGHT.NET>
>Reply-To: Paul Chubbuck <paul@TAKINGFLIGHT.NET>
>To: vanagon@GERRY.VANAGON.COM
>Subject: AC and LP on Dometic question
>Date: Mon, 9 Jul 2007 08:41:24 -0600
>
>In my ongoing tests and Dometic improvements, yesterday I switched from AC
>to LP, but accidentally forgot to change the switch to to Gas.  So the
>burner ran all night, but the switch read AC.  It cooled VERY poorly during
>this time, though it did cool some, and when I found my mistake and made
>the
>switch read "Gas", then it started cooling normally.  What is going on
>here?
>
>Thanks,
>Paul
>
>P.S. As an aside, yesterday I removed the grill behind the range.  It's
>virtually invisible anyway and I figure removing it improves the efficiency
>of the hot air rising off the back of the fridge by around 50% or better.