Gas Heating System - GE GFDR485GF Technical Service Manual

Gas Valve
Gas Flow
assembly. The gas valve assembly consists of a
regulator, safety valve, main valve and solenoids to
operate the gas valves. See below.
Gas Valve Block Diagram
Dual Solenoid
Regulator
Safety Valve Main Valve
The dual solenoid consists of a safety coil and a
booster coil. To ensure safe operation, both coils
must be energized in order to open the safety valve.
As gas enters the gas valve assembly, the regulator

Gas Heating System

Flame Detector
Burner
Inlet Thermostat
Igniter
The regulator regulates gas pressure by moving an
actuator up and down as needed. When the gas
pressure goes too high, the excess pressure in the
regulator chamber forces the actuator to rise. This
lowers, the port opens back up.
Single Solenoid
44
High Limit Thermostat
Gas Supply Pipe
Regulator and Safety Chamber
Actuator
Gas Entry Port