19
Furnace operation
Purge gas lines of air prior to start-up. Do not purge lines into
an enclosed burner compartment. Follow NFPA 54, National
Fuel Gas Code 8.1 for proper purging methods.
Check for leaks using an approved chloride-free soap and
water solution, an electronic combustible gas detector, or
other approved method.
NOTE:
An interlock switch prevents furnace oper ation if the
blower door is not in place. Keep the blower access doors in
place except for inspection and maintenance.
Furnace Start-up
1. Close the manual gas shutoff valve external to the
furnace.
2. Turn off the electrical power to the furnace.
3. Set the room thermostat to the lowest possible setting.
4. Remove the burner compartment door.
NOTE:
This furnace is equipped with an ignition device which
automatically lights the burner. Do not try to light the burner
by hand.
5.
White-Rodgers valves:
Push the switch to the OFF
position.
6. Wait five minutes then smell for gas. Be sure to check
near the floor, as some types of gas are heavier than
air.
7. If gas can be smelled following the five minute waiting
peri od in Step 6, immediately follow the instructions on
Page 3 of this manual. If you do not smell gas after five
minutes:
White-Rodgers valves:
Push the switch to the ON
position.
8. Replace the door on the front of the furnace.
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
CAUTION
T
O
PREVENT
UNRELIABLE
OPERATION
OR
EQUIPMENT
DAMAGE
,
THE
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
Figure 10
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 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.
