SERVICING
56
WARNING
Disconnect gas and electrical power supply.
1. Connect a water manometer or adequate gauge to the
inlet pressure fitting of the gas valve.
2. Remove the pressure tap fitting at the manifold if provided
or check at the gas valve outlet fitting and connect another
manometer or gauge.
Outlet
Inlet
Outlet Pressure
Tap
Inlet Pressure
Tap
Gas Valve
On/Off
Switch
Manometer
Open to
Atmosphere
Manometer
Hose
Open to
Atmosphere
Manometer
Hose
High Pressure
Adjust
Low Pressure
Adjust
WHITE ROGERS MODEL 36G 2-STAGE GAS VALVE
Open to
Atmosphere
Open to
Atmosphere
Inlet Pressure
Manifold
Pressure
WHITE ROGERS MODEL 36G 1-STAGE GAS VALVE
Gas Valve On/Off
Selector Switch
Pressure Regulator
(under cap screw)
Outlet
Pressure
Tap
Open to
Atmosphere
Manifold
Pressure
Open to
Atmosphere
Inlet Pressure
Inlet
Pressure
Tap
HONEYWELL MODEL VR8215 1-STAGE GAS VALVE
MEASURING INLET AND MANIFOLD GAS PRESSURE
With Power ON:
WARNING
Line Voltage now present.
3. Put furnace into heating cycle and turn on all other gas
consuming appliances.
For
NATURAL GAS:
a.
Inlet pressure should be a nominal 7" w.c.
b.
(2 stage heat models only) Manifold pressure on
low stage should be
2.0” w.c. ± .3"w.c.
c.
Manifold pressure for 1 stage heat models and high
stage for 2 stage heat models should be 3.5” ±
.3"w.c.
For
PROPANE GAS:
a.
Inlet pressure should be a nominal 11" w.c.
b.
(2 stage heat models only) Manifold pressure on
low stage should be 6" w.c.
c.
Manifold pressure for 1 stage heat models and high
stage for 2 stage heat models should be 10” w.c.
Manifold Gas Pressure
Natural Gas
3.5" w.c.
Propane Gas
10.0" w.c.
Single Stage
Range
Nominal
Natural
Low Stage
1.6 - 2.2" w.c.
2.0" w.c.
High Stage
3.2 - 3.8" w.c.
3.5" w.c.
Propane
Low Stage
5.7 - 6.3" w.c.
6.0" w.c.
High Stage
9.7 - 10.3" w.c.
10.0" w.c.
Manifold Gas Pressure
Gas
Two Stage
