Operating instructions

22 6 720 607 160
15. Replacement of parts
Warning: Isolate electrical supply before servicing the
appliance.
Any servicing or parts replacement must be carried out by a
competent person. Use only genuine Manufacturer’s Parts.
Before commencing servicing or parts replacement turn off
the gas supply at the main gas isolation valve and ensure
that the appliance is cool.
15.1 Main Burner
Disconnect the spark electrode and the sensing electrode
at the main burner.
Remove the two screws retaining the bracket burner front
and lift the complete assembly clear.
Undo the union connection below the burner.
Remove and retain the fibre washer.
Lift and rotate the front edge of the burner backward
through 180 degrees. With the burner oriented
horizontally and upside down, withdraw forward beneath
the combustion chamber skirt.
Replace the burner and re-assemble in reverse order.
15.2 Spark Electrode / Sensing electrode
Remove main burner as described in Section 16.1 and
replace faulty components.
15.3 Heat Exchanger
Isolate the appliance from the incoming cold water supply,
open a hot tap and drain down the appliance via the
fitted drain cock.
Undo the two retaining screws from the heat exhanger
bracket.
Disconnect the heat exchanger inlet and flow pipes at
the base of the combustion chamber.
Remove the locknuts from the heat exchanger inlet and
outlet connections and lift the heat exchanger clear.
Replace the heat exchanger and re-assemble in reverse
order.
15.4 Water sensor (Turbine)
Isolate the appliance from the incoming cold water supply,
open a hot water tap and drain down the appliance via
the fitted drain cock.
Disconnect the temperature sensor from the inlet water
pipe.
Undo the wire connections between the control box and
and the water sensor (turbine).
Remove the two spring clips and replace the turbine.
Reassemble in reverse order.
15.5 Gas Valve
Place the control box in maintenance position as
described in Section 13.3.
Undo all wire connections to the gas valve.
Undo the connection between the gas valve and the
burner connector.
Remove the two screws securing the inlet end of the
valve to the mounting bracket, remove the valve.
Replace the gas valve and re-assemble in reverse order.
Check inlet pressure and Max and Min burner pressures