According to the spec sheet I got with my rig, the Arctic pack (and the vendor does spell it correctly) consists of heating pads for fresh water, grey water and black water tanks. They're 12V DC and each one draws between 4 and 7 amps, depending on size.
Their thermostats swicth on when the tank contents drop to 40F and stay on until the contents reach 60F. The "OFF" temp seems very high to me. In my rig, the switch for what FR calls the "Artic" pack is on a panel on the fromt of the sink cabinet next to the one to turn the gas on to the water heater and the switch for "Elctric W/H or Microwave".
BTW, to a Brit, an "Artic" is a tractor trailer rig, known in full as an "articulated lorry".
Frank and Eileen
No longer RVers or FR owners