Installation

PRIMARY FURNACE

SECONDARY (ADD-ON) FURNACE

When installed as a seondary furnace, a Duct Damper must be installed between the air discharge of the 6300 furnace and the primary (Gas, Electric, etc.). This duct damper prevents the air from the primary furnace from back flowing to the secondary furnace. Damper must be a mechanical (spring return) style with a simple closure switch to determine if the damper is opened or closed. The damper will connect to the multi-fuel furnace’s printed circuit board (PCB). See wiring diagram in this manual.

USSC

11