20
Lighting & Adjustment of the Appliance
WARNING:
FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly could
result in serious injury or property damage.
Never test for gas leaks with an open flame. Use
a commercially available soap solution made
specifically for the detection of leaks to check
all connections. A fire or explosion may result
causing property damage, personal injury or
loss of life.
1. Turn ON the manual gas valve, located on the outside
of the unit to the ON position.
2. Check all gas connections for leaks with a soap and
water solution. If the solution bubbles there is a gas
leak which must be corrected.
3. Turn on the electrical power to the appliance.
4. Turn the gas valve ON/OFF knob to the ON position.
See Figure 13 (page 18).
5. Set the thermostat to a point above room temperature
to begin the heating cycle of the furnace.
6. Check that the furnace ignites and operates properly.
Refer to the installation instructions provided with the
unit for the normal operating sequence.
7. After ignition, visually inspect the burner assembly to
ensure that the flame is drawn directly into the center of
the heat exchanger tube. In a properly adjusted burner
assembly, the flame color should be blue with some light
yellow streaks near the outer portions of the flame.
NOTE:
The igniter may not ignite the gas until all air is bled
from the gas line. If the ignition control locks out, turn the
thermostat to its lowest setting and wait one minute then
turn the thermostat to a point above room temperature
and the igniter will try again to ignite the main burners.
This process may have to be repeated several times
before the burners will ignite. After the burners are lit,
check all gas connections for leaks again with the soap
and water solution.
Measuring the Manifold Pressure
The manifold pressure must be measured by installing a
pressure gauge (Manometer, Magnehelic Meter, etc.) to
the outlet end of the gas valve as follows:
1. Turn off all electrical power to the appliance.
2. Shut OFF the gas supply at the manual shutoff valve
located outside of the appliance.
3. Using a 3/16” Allen wrench, remove the manifold
pressure tap plug located on the outlet side of the gas
valve. See Figure 13 (page 18).
4. Install an 1/8” NPT pipe thread fitting, that is compatible
with a Manometer or similar pressure gauge.
5. Connect the Manometer or pressure gauge to the
manifold pressure tap.
6. Set the room thermostat above room temperature to
start the furnace.
7. Allow the furnace to operate for 3 minutes and then
check the manifold pressure. Compare the measured
value with the value shown in Table 11 (page 31).
Removing the Manometer/Pressure Gauge
After the manifold pressure is verified, the Manometer
or pressure gauge must be removed from the gas valve.
1. Turn the thermostat to its lowest setting.
2. Turn OFF the main gas supply to the unit at the manual
shut-off valve, which is located outside of the unit.
3. Turn OFF all of the electrical power supplies to the unit.
4. Remove the pressure gauge adapter from the gas valve
and replace it with the 1/8” NPT manifold pressure plug
that had been removed earlier.
NOTE:
Make sure the
plug is tight and not cross-threaded.
5. Turn ON the electrical power to the unit.
6. Turn ON the main gas supply to the unit at the manual
shut-off valve.
Completing the Conversion
WARNING:
Do not alter or remove the original rating plate
from the furnace.
1. Affix the LP label from the orifice package to the rating
plate.
2. Reinstall the appliance door.
3. Run the appliance through 3 complete cycles to assure
proper operation.
