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6 | Natural Gas to L.P. Gas Conversion Kit
Burner Box
Ignitor
Flame
Sensor
Burner Orifices
Figure 1
Typical furnace installation
Flame sensor
Figure 2
Igniter position
2.5 Reinstalling the Burner Assembly
1.
Reinstall the gas manifold assembly to the burner box with the four (4)
fasteners, which were removed earlier.
2.
After installing the burner, inspect the alignment of the burners with the
heat exchanger tubes. The center of the burners should be aligned with the
center of the tubes. For the igniter and fl ame sensor position refer to Figure
1 and Figure 2.
3.
Reconnect the gas piping to the gas valve.
4.
Reconnect the wires to the gas valve terminals.
5.
Reconnect the igniter at the 2 position plug.
6.
Reconnect the fl ame sensor wire.
Data subject to change without prior notice. | 05.2018
Inlet
Gas Valve
ON/OFF Lever
Gas Manifold
Fasteners
Fasteners
Igniter
Furnace
right side
Furnace
Front
2.6 Pressure Gauge Installation
For natural gas installations, the incoming gas line pressure at the gas valve inlet
must be between 5.0" WC and 10.5" WC. For LP gas installations, the incoming
gas line pressure at the gas valve inlet must be between 11.0" WC and 13.0" WC.
This pressure can be checked at the inlet end of the gas valve using a pressure
gauge or U-tube manometer. The pressure gauge must be installed according to the
manufacturer's supplied instructions.
2.7 Lighting and Adjustment of the Appliance
1.
Turn ON the gas at the manual valve, outside of the unit.
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. Do NOT use an
open fl ame to check for gas leaks.
3.
Turn ON the electrical power to the appliance.
4.
Move the gas valve lever to the "ON" position. The lever must be moved to
the end of its range of motion to insure the valve is completely open. Use
only your hand to push in or turn the gas control valve. Never use tools.
5.
Set the room thermostat to a temperature above room temperature to begin
the heating cycle of the unit.
6.
Reinstall the burner access panel.
7.
Check that the unit ignites and operates properly. Refer to the Installation,
Operation, and Maintenance Manual provided with your unit for the normal
operating sequence.
8.
After the fl ame ignites, visually inspect the burner assembly to ensure that
the fl ame is drawn directly into the center of the heat exchanger tube, as
shown in Figure 4. The end of the fl ame will be out of sight around the bend
of the heat exchanger tube. In a properly adjusted burner assembly, the
fl ame color should be blue with some light yellow streaks near the outer
portions of the fl ame.
U ntil all of the air is bled out of the gas line, the hot surface ignitor may not
ignite the gas. If the ignition control locks out, turn the thermostat to its
lowest setting and wait one minute. Set the thermostat to a temperature
above room temperature and the ignitor will try again to ignite the main
burners. This process may have to be repeated several times before the
burners will ignite.
WARNING:
Once the burners are lit, check all gas connections for
leaks again with the soap and water solution. If the solution
bubbles, there is a gas leak which must be corrected. Do not
use an open fl ame to check for gas leaks.
Installation Instructions
Bosch Thermotechnology Corp.
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