
November
2013
TYPICAL SYSTEM SCHEMATICS
IN PARALLEL WITH EXISTING FURNACE
Page 14
DESCRIPTION OF OPERATION
1) The Circulation Blower (A) draws air through the “new” cold air return and moves it through the solid fuel
furnace, which connects to the hot air plenum above the existing furnace.
2) A back draft damper (1) opens, allowing the heated air to circulate through the heating ducts.
3) A second back draft damper (2) closes, preventing the heated air from circulating through the existing furnace.
4) The existing furnace is controlled by a separate thermostat.
5) If the existing furnace fi res, back draft damper (2) will automatically open and back draft damper (1) will
automatically
close.
REQUIRED ADDITIONAL COMPONENTS
1) Filter box
2) Circulation blower
3) (2 ) Back draft dampers (not available from Royall)
4) Water Loop