36 USE ONLY GENUINE REPLACEMENT PARTS
12. Turn pump, gas valve knob and heater power “ON”. Test fire heater by following the GAS PRESSURE TEST PROCEDURE.
GAS VALVE REPLACEMENT: Refer to Figure1: Sub-Assemblies, Figure23: Location of Components and Figure26: Gas Valves as
needed.
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.
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. Unscrew the gas valve from the gas manifold pipe.
7. Reassemble the gas manifold assembly using the new gas valve. Only use liquid pipe thread sealant on the male threads of the
gas manifold pipe. Do not place pipe dope on the first two threads of any joint.
8. Reverse the above procedure to re-install the gas manifold. Turn pump, main gas, gas valve and heater power “ON”. Test fire
heater by following the GAS PRESSURE TEST PROCEDURE. Check for leaks using soap and water
IGNITER REPLACEMENT: Refer to Figure1: Sub-Assemblies and Figure23: Location of Components as needed.
1. Turn pump, gas supply, and heater power “OFF”.
2. Remove the front access panel.
3. Disconnect the igniter wires from the ignition control board.
4. Remove the screws from the igniter access panel. Working from the underside of the panel, press the bushing out of the hole in
the sheet metal panel.
5. Slide the igniter wires through the slot on the panel and pull the panel free.
6. Remove the (2) screws that secure the igniter.
7. Pull the igniter straight back until it is free of the combustion chamber refractory and out of the air box.
8. Replace the igniter and reverse the above procedure to reassemble unit.
FLAME SENSOR REPLACEMENT: Refer to Figure1: Sub-Assemblies and Figure23: Location of Components as needed.
1. Turn pump, gas supply, and heater power “OFF”.
2. Remove the front access panel (4 screws).
3. Disconnect the flame sensor wire from the ignition control board.
4. Remove the screws that secure the flame sensor to remove the sensor.
5. Replace the flame sensor and reverse the above procedure to reassemble unit.
BURNER ORIFICE REPLACEMENT: Refer to Figure1: Sub-Assemblies and Figure23: Location of Components as needed.
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.
4. Disconnect the wires from the terminals on the gas valve.
5. Remove the gas manifold assembly. It is attached to the air box using (4) screws.
6. Remove the orifices using a 7/16” wrench.
7. After cleaning or replacing orifices re-install into the gas manifold pipe being careful not to cross-thread or over tighten as a leak
may result.
NOTICE: Do not enlarge orifice holes.
NOTICE: All replacement wiring must be replaced with manufacturer supplied replacement parts.
IGNITION CONTROL SYSTEM: The control system in this heater consists of 4 components (ignition control board, display board,
fuse board and membrane keypad). The locations of these components are shown in Figure23: Location of Components. The
ignition control board functions as the heater’s thermostat control, safety control system, and gas ignition and combustion
monitoring 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.
4. Detach the board from the sheet metal panel by compressing the plastic standoffs.
5. Replace the board and reverse the above procedure to reassemble unit.
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