Greenheck PVF/PVG Indirect Gas-Fired Heat Modules (474645) - Manual (Page 16)

Indirect Gas-Fired Heat Modules 16
®
Gas Valves
Overview of typical Two Stage Valve.
Used in eight stage and two stage furnaces. Overview of typical Modulating Valve.
Used in 4:1 Electronic Modulation
Low Fire and High Fire
adjustments are made
on printed circuit board
behind removable cover
Low Fire
Adjusting Screw
High Fire
Adjusting Screw
Terminal Block
Gas Control Knob
(ON / OFF)
Close-up of Terminal Block
High fire terminal is the bottom of
three terminals.
LO
C
HI