United States Stove Company 6110 - Manual (Page 11)

USSC 11
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 Pellet furnace
and the primary (Gas, Electric, etc.). Damper must be a mechanical (spring return) style damper with a simple closure
switch to determine if damper is opened or closed. The damper will connect to the multi fuel furnace’s PCB (Printed
Circuit Board). See wiring diagram in this manual.