9.2
Replacement/ Exchange of components
1. Main injector
Carry out general servicing 1-4
Unscrew injector from adaptor/ burner
2. Pilot Injector
Carry out general servicing 1-4.
Unscrew nut securing thermocouple to pilot bracket/ assembly.
Pull off ignition lead to electrode.
Disconnect pilot supply pipe from pilot injector.
Remove two screws securing pilot assembly to support bracket.
Unscrew pilot injector from pilot burner.
Reassemble in reverse order.
3. Piezo Igniter Lead.
Carry out general servicing 1-4
Pull off ignition lead from Piezo igniter and electrode, cut off tie securing lead to pilot
supply and thermocouple. Fit new ignition lead and secure with new cable tie.
4. Ignition Electrode
Carry out general servicing 1-4.
Unscrew nut securing thermocouple to pilot bracket/ assembly.
Pull off ignition lead to electrode.
Remove screw securing electrode to pilot assembly and lift out electrode.
Fit new electrode, check spark gap is 5mm +/- 0.5mm (3/16in)/ (See Fig. 3)
5. Thermocouple
Carry out general servicing 1-4.
Unscrew nut securing thermocouple to pilot bracket/ assembly and F.S.D
Cut off cable tie securing ignition lead to thermocouple.
Note:
on reassembly fit new cable tie.
6. Thermomag Unit for Sit 500 F.S.D
Unscrew nut securing thermocouple to rear of unit.
Unscrew thermomag unit from Sit 500 valve.
After reassembly check Sit 500 for gas soundness.
7. Piezo Igniter
Pull off ignition lead from rear of igniter.
Unscrew nut securing piezo igniter to support bracket.
8. Main Burner
Carry out general servicing 1-4.
Remove two screws securing burner to injector assembly and burner pan.
