GPG16M Service Manual

SERVICING
51
Outlet
Inlet
Outlet Pressure
Tap
Inlet Pressure
Ta p
Gas Valve
On/Off
Switch
W/R 36G54-238
WHITE ROGERS MODEL 36G 2-STAGE GAS VALVE
W/R 36G22-202
WHITE ROGERS MODEL 36G 1-STAGE GAS VALVE
Gas Valve On/Off
Selector Switch
Inlet
Pressure
Tap
Pressure Regulator
(under cap screw)
Outlet
Pressure
Tap
HONEYWELL MODEL VR8215 1-STAGE GAS VALVE
S-305 CHECKING MAIN BURNERS
The main burners are used to provide complete combustion
of various fuels in a limited space, and transfer this heat of the
burning process to the heat exchanger.
Proper ignition, combustion, and extinction are primarily due
to burner design, orifice sizing, gas pressure, primary and
secondary air, vent and proper seating of burners.
BECKETT BURNER
WARNING
Disconnect gas and electrical power supply.
In checking main burners, look for signs of rust, oversized and
undersized carry-over ports restricted with foreign material,
etc.
S-306 CHECKING ORIFICES
A predetermined fixed gas orifice is used in all of these
furnaces. That is an orifice which has a fixed bore and
position.
A
GAS
STREAM
B