This is a Touchpad Controller developed by Unity System in Redwood City, California from 1985-1999. In 1999 Unity System ceased to operate as a company. The controller operate based on disk type 1-1/4 " temp sensor placed on walls and control two furnaces and a boiler with five zones for radiant heat floor.
I have only the owner's manual.
I'm looking for a installation/service manual for this controller.
Search on internet did not help, most of supply HVAC store do not know about this control .
I appreciate any help. Thanks