Furnace Shutdown; Gas Supply Pressure Measurement - Intertek MES80 Installation Instructions Manual

9. Open the manual gas valve external to the furnace.
10. Turn on the electrical power supply to the furnace.
11. Adjust the thermostat to a setting above room
temperature.
12. After the burners are lit, set the room thermostat to the
desired temperature.
NOTE: There will be a delay between thermostat energizing
and burner firing.

Furnace Shutdown

1. Set the thermostat to lowest setting. The integrated
control will close the gas valve and extinguish flame.
Following a 30 second delay, the induced draft blower
will be de-energized. The circulation blower will shut
down when the time delay expires. Time delay is
selectable on all models.
2. Turn off the electrical power supply to the furnace.
3. Remove the burner compartment door.
4. White-Rodgers valve: Push switch to the OFF position.
5. Close manual gas shutoff valve external to the furnace.
6. Replace the door on the unit.

Gas Supply Pressure Measurement

T
O PREVENT UNRELIABLE OPERATION OR EQUIPMENT DAMAGE
INLET GAS SUPPLY PRESSURE MUST BE AS SPECIFIED ON THE UNIT
RATING PLATE WITH ALL OTHER HOUSEHOLD GAS FIRED APPLIANCES
.
OPERATING
The line pressure supplied to the gas valve must be within
the range specified on Table 9. 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 unit OFF. To measure inlet pressure,
use the following procedure.
White-Rodgers Model 36J22Y-204
CAUTION
Figure 13
1. Turn OFF gas to furnace at the manual gas shutoff
valve external to the furnace.
2. Turn OFF all electrical power to the system.
3. Inlet pressure tap connections:
a. White-Rodgers valve:
Back inlet pressure test screw (inlet pressure tap out
one turn (counterclockwise, not more than one turn).
4. Connect calibrated U tube manometer (or appropriate
pressure gauge) at either the gas valve inlet pressure
tap or the gas piping drip leg. See White-Rodgers
36J22Y-204 gas valve Figure 13 for location of inlet
pressure tap.
5. Turn ON the gas supply.
6. Turn On power and operate the furnace and all other
gas consuming appliances on the same gas supply line.
7. Using a leak detection solution or soap suds, check for
leaks at screw (White-Rodgers valve). Bubbles forming
indicate a leak. SHUT OFF GAS AND REPAIR ALL
LEAKS IMMEDIATELY!
8. Measure the gas supply pressure with burners firing.
Adjust supply pressure using the Inlet Gas Supply
Pressure table shown below. If supply pressure reading
differs from the table, make necessary adjustments to
pressure regulator, gas piping size, etc., and/or consult
with local gas utility.
Natural Gas Minimum: 4.5" w.c. Maximum: 10.0" w.c.
,
THE
9. Turn OFF all electrical power and gas supply to the
system.
10. Remove the manometer hose from the hose barb fitting
or inlet pressure Tap.
11. Replace inlet pressure tap:
a. White-Rodgers valve:
Turn inlet pressure test screw in to seal pressure port
(clockwise, 7 in-lb minimum).
12. Retest for leaks. If bubbles form, shut down gas and
repair leaks immediately.
13. If there are no leaks, turn ON electrical power and gas
supply to the system.
14. Turn valve switch ON.
NOTE: If measuring gas pressure at the drip leg, a
field-supplied hose barb fitting must be installed prior to
making the hose connection. If using the inlet pressure
Tap on the White-Rodgers gas valve, then use the
36G/J Valve Pressure Check Kit, Goodman Part No.
0151K00000S.
22
INLET GAS SUPPLY PRESSURE
Table 9