Johnson & Starley WARMCAIR C26D, Installation, Commissioning & Servicing Instructions

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16.3 GAINING ACCESS FOR SERVICING
16.3.1 Ensure the electrical & gas supply is isolated as needed.
16.3.2 Remove the return air filter and pull the bottom front panel off.
16.3.3 Remove the front panel by unscrewing the 4 retaining screws at top and bottom.
16.3.4 Remove the front cover.
16.4 MAIN BURNER ASSEMBLY
16.4.1 Refer to section 16.3. See Figure 19.
16.4.2 Disconnect the gas pipe at the top of the isolation valve.
16.4.3 Disconnect the electrode, igniter and earth leads from the ESYS, then remove the screw and
panel on the ESYS and remove. Disconnect the electrical connections.
16.4.4 Remove the two screws from the valve / Venturi assembly and withdraw.
16.4.5 Remove the 4 nuts and washers securing the burner assembly to the heat exchanger and
withdraw the assembly, take care not to damage the internal ceramic pad.
16.4.6 Inspect the inside of the burner assembly for debris. Clean with a soft brush if
necessary.
16.4.7 Inspect the gaskets and replace if necessary.
16.4.8 Inspect and clean the spark ignition and flame sensing electrode, removing any debris and
oxidization. Check the spark gap and position of the spark electrode and the positioning of
the flame sensing electrode.
16.4.9 Once reassembled re-check electrode and igniter nuts are tight.
16.4.10 Refit in reverse order ensuring a good seal is made.
16.5 IGNITION & FLAME DETECTION
ELECTRODE
16.5.1 Refer to section 16.3. See Figures 19 & 20.
16.5.2 Follow 16.4.4 to remove the valve / Venturi.
16.5.3 Unscrew the two nuts that retain the electrode to
the cover plate and remove the assembly.
16.5.4 Inspect and clean the electrode, removing any
debris and oxidization. If necessary use an abrasive
paper or cloth.
16.5.5 Inspect the gasket and replace if necessary during
re-assembly.
16.5.6 Repeat sequence for the flame detection
electrodes with the exception of the earth lead.
16.5.7 Refit in reverse order and tighten nuts.
FIGURE 20. ELECTRODE GAPS
FIGURE 19. MAIN BURNER ASSEMBLY REMOVAL
ESYS
PANEL
SCREW
ELECTRICAL
CONNECTIONS
BURNER
ASSEMBLY
NUTS
BURNER
ARM
COMBUSTION
CHAMBER
ELECTRODE NUTS
BURNER
ASSEMBLY
NUT
COVER PLATE
GAS COCK
CONNECTION
FLAME DETECTION ELECTRODE
LEAD
IGNITION ELECTRODE LEAD
GAS VALVE
VENTURI
ESYS