Service manual

G.Fire Service Manual 14 Issue A — © Masport, March 2004
1.8 REMOVING AND REPLACING THE PILOT ASSEMBLY
NOTE: EIS and ECS models have no pilot. The pilots fitted to the other models have top loading jets, so
the jet can be removed without removing the pilot assembly. Pilot assembly removal should be rare.
1. Remove the burner, following steps 1 – 6 in Section 1.7.
2. Disconnect the Piezo wire, (the thermopile and thermocouple, if fitted) and the gas pipe to the pilot.
3. Withdraw the screws fixing the pilot assembly to the burner tray.
4. The pilot assembly can now be disconnected and lifted clear.
5. Follow the above order in reverse to replace the pilot assembly.
NOTE: Always smear ROCOL MOLYCOTE J166 on the pilot tube retaining nut threads when re-fitting
the pilot tube.
1.9 ACCESSING THE PILOT JET
The pilot jet is reached for removal as
illustrated, by pulling the cap upward
and using a 4mm hex Allen key.
TOP LOADING PILOT
CORRECT SPARK GAP
4 - 5 mm.
1.10 ACCESSING THE MAIN INJECTOR
1. Remove the burner (See 1.7)
2. The injector can now be unscrewed from the gas pipe elbow.
3. When replacing an injector, it may be necessary to remove the pedestal front panel (simply lift it up,
then toward you to lift it clear), so that the elbow can be aligned with the hole in the burner tray as
the jet picks up the elbow thread. The jet should not be over-tightened, and a small amount of
teflon thread sealant (not tape) should be applied to the thread to prevent gas leakage.
1.11 REMOVING CONTROL VALVES AND REGULATORS (Cardrona & Monaco)
1.11.1 STANDARD MODELS
1. Turn off the gas supply.
2. Remove the access panels. See Section 1.6.1 and 1.6.3.
3. Disconnect the gas pipe at the inlet to the regulator. See Drawing No 8.
4. Disconnect the pipe between the regulator and the control valve.
5. At the control valve, disconnect the pipes to the burner and the pilot.
6. Also disconnect the thermocouple connection to the control valve.
7. Disconnect the control rod.
8. After removing their mounting screws the pressure regulator and control valve can be lifted clear.
9. Re-assemble in the reverse order, taking care to check for gas leaks.