Harman Stove Company PB 105 - Manual (Page 36)

36 3-90-07205R19_05/13
Atmospheric Conversion
Atmospheric Conversion: Item # 1-00-232200, provides automatic fill, and converts the heating system
plumbing from pressurized to a zero pressure system. Allows for installation into more places where
codes and standards restrict pressurized systems. Note that when using the atmospheric conversion,
air bleeders and check valves may actually allow air into the lines. Another reason it is important to have
a licensed Plumber involved in each phase of your installation.
When using the atmospheric conversion, the circuit board dipswitch #6 must be in the “ON” position.
This will lower the overheat temperature parameters to prevent boiling of the water. Since altitude
affects the boiling point, it is also recommended to set #6 to “ON” at elevations above 3000 ft.