GCSS96 Installation Manual

33
6. Wait five minutes then smell for gas. Be sure check
near the floor as some types of gas are heavier than
air.
7. If you smell gas after five minutes, immediately follow
the safety instructions in the Safety Considerations
on page 3 of this manual. If you do not smell gas
after five minutes, move the furnace gas valve
manual control to the ON position.
8. Replace the burner compartment door.
9. Open the manual gas shutoff valve external to the furnace.
10. Turn on the electrical power to the furnace.
11. Adjust the thermostat to a setting above room
temperature.
12. After the burners are lit, set the thermostat to desired
temperature.
FURNACE SHUTDOWN
1. Set the thermostat to the lowest setting.
The integrated control will close the gas valve and
extinguish flame. Following a 15 second delay, the induced
draft blower will be de-energized. The indoor blower
will shut down when the time delay expires (selectable
on 96% models).
2. Remove the burner compartment door and move the
furnace gas valve manual control to the OFF position.
3. Close the manual gas shutoff valve external to the furnace.
4. Replace the burner compartment door.
GAS SUPPLY PRESSURE MEASUREMENT
GAS PRESSURE TEST
The line pressure supplied to the gas valve must be within the
range specified below. The supply pressure can be measured at
the gas valve inlet pressure tap or at a hose fitting installed in
the gas piping drip leg. The supply pressure must be measured
with the burners operating. To measure the gas supply pres-
sure, use the following procedure.
1. Turn OFF gas to furnace at the manual gas shutoff valve
external to the furnace.
2. Connect a calibrated water manometer (or appropriate
gas pressure gauge) at either the gas valve inlet pressure
tap or the gas piping drip leg. See White-Rodgers 36J22
gas valve figure for location of inlet pressure tap.
OUTLET
INLET
Gas Valve ON/OFF Selector Switch
Outlet Pressure
Inlet Pressure
Regulator
Cover Screw
White-Rodgers Model 36J22
OUTLET
INLET
White-Rodgers Model 36J22
Connected to Manometer
NOTE: If measuring gas pressure at the drip leg, a field-
suppliedhose barb fitting must be installed prior to making the
hose connection. If using the inlet pressure tap on the White-
Rodgers 36J22 gas valve, then use the 36G/J Valve Pressure
Check Kit, Part No. 0151K00000S.
3. Turn ON the gas supply and operate the furnace and all
other gas consuming appliances on the same gas supply
line.
4. Measure furnace gas supply pressure with burners firing.
Supply pressure must be within the range specified in the
Inlet Gas Supply Pressure table.
Gas Range Nominal
Natural 3.2 - 3.8" w.c. 3.5" w.c.
Propane 9.7 - 10.3" w.c. 10.0" w.c.
Manifold Gas Pressure
If supply pressure differs from table, make the necessary adjust-
ments to pressure regulator, gas piping size, etc., and/or consult
with local gas utility.
5. Turn OFF gas to furnace at the manual shutoff valve and
disconnect manometer. Reinstall plug before turning on
gas to furnace.
6. Turn OFF any unnecessary gas appliances stated in step 3.
Measuring Inlet Gas Pressure (Alt. Method)
Figure 39