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44
FLAME SENSOR:
Refer to Figure 8 and Figure 21 as
To remove the fl ame sensor:
1. Turn pump, gas supply, and heater power "OFF".
2. Remove the front access panel (4 screws).
3. Disconnect the wire from the fl ame sensor.
4. Remove the screws that secure the fl ame sensor to remove the sensor.
5. Reverse the above procedure to install the fl ame sensor.
BURNER ORIFICES:
Refer to Figure 8 and Figure 21 as needed.
To remove the burner orifi ces:
1. Turn pump, gas supply, and heater power "OFF".
2. Disconnect the union joint in the gas supply piping outside the heater cabinet.
3. Remove the front access panel. It is secured with (4) screws.
4. Disconnect the wiring terminals from the gas valve.
5. Remove the gas manifold assembly. It is attached to the air box using (4) screws.
6. Remove the orifi ces using a 7/16" wrench.
7. After cleaning or replacing orifi ces re-install into the gas manifold pipe being careful not to cross-
thread or over tighten as a leak may result.
ATTENTION: Do not enlarge orifi ce holes.
GAS CONVERSION:
The factory-installed gas train, where appropriate, may be changed from natural gas to propane or from
propane to natural gas, using the appropriate conversion kits available from the factory. Gas conversions are
to be performed only by a qualifi ed service agency. Detailed instructions are included with each
ELECTRICAL WIRING:
ATTENTION: If it is necessary to replace any of the original wiring, it must be replaced with
parts supplied by the manufacturer.
IGNITION CONTROL SYSTEM:
The ignition control system in this heater consists of 3 printed circuit boards (the ignition control board,
the display board, and the fuse board) and a keypad. The locations of these components are shown in Figure
21. The ignition control system functions as the heater's thermostat, safety control system, and controller for
the gas combustion system.
To remove/replace the ignition control board or the fuse board:
1. Turn pump, gas supply, and heater power OFF.
2. Remove the front access panel.
3.
Disconnect all wires from the printed circuit board.
needed.
kit.
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Troubleshooting
