Which Tempcontrol 37-2 digital version do I have to use to control the Heating Unit?
You need a Tempcontrol 37-2 digital with a control algorithm parameter set especially for the Heating Unit. This parameter set is included in Tempcontrol 37-2 digital devices with serial number 107-02-238 and higher (“P-5″ is temporarily indicated in the display after switching on the device). Older versions of the Tempcontrol 37-2 digital should be upgraded to support the Heating Unit.