I have one of those on our Georgetown. What a stupid system design. Documentation from the manufacturer was included in what we got from the original owner when we bought the rig.
There are 12Volt DC resistance heating pads bonded to the undersides of the grey and black waste tanks. I think my rig has two pads on each tank. These pads have built-in thermostats that are non-adjustable.
I expected the system to be similar the the "frost-stats" and heating tape used on vulnerable water lines in S&B houses. They turn on at about 34F and off again at about 38F. Not so for the "Arctic Pack". They turn the heat on at 40F and don't turn it off again until the tank contents reach 60F. Who needs to heat up the poop in the black tank to 60 degrees?
Also, there's no mention of anything that senses whether there's content in the tanks. I was concerned that these heaters could get the polythene skin of the tanks hot enought to melt through.
I disconnected the system so there's no risk of problems. Note that we live in an area where long-term cold weather is rare and "bitterly cold" usually means mid-twenties!
Frank Damp -Anacortes, WA,(DW- Eileen)
ex-pat Brits (1968) and now ex-RVers, as of 08 Dec 14.