Air/Gas Flap Valve Assembly; Ignition Transformer; Electrode Assembly; Burner Housing, Burner/ Gasket - Worcester 27i System Compact Installation, Commissioning And Servicing Instructions

SERVICE AND SPARES

6.8.10 AIR/GAS FLAP VALVE ASSEMBLY

1. Remove the single screw securing the air/gas flap valve assembly.
2. Pull the flap assembly away from the housing.
2.
Fig. 95 Air/gas flap valve

6.8.11 IGNITION TRANSFORMER

To remove the ignition transformer
▶ Remove the combustion air inlet pipe.
▶ Ensure that the harness wires are disconnected from the transformer.
▶ Remove the electrode cables.
▶ Lift the transformer from the retaining clip.
Fig. 96 Ignition transformer

6.8.12 ELECTRODE ASSEMBLY

CAUTION: Component replacement:
▶ After replacement of a gas related component, where
a gasket or seal has been disturbed or replaced, check
for gas tightness using a gas sniffer/analyser.
▶ Also after re-assembly, carry out the following
checks:
Fan pressure in section 6.5,
Flue gas analysis in section 6.6,
To remove the spark electrode assembly:
1. Undo and remove the two nuts securing the electrode assembly
2. Rotate the electrode assembly down and forward to remove from the
Heat exchanger.
▶ Inspect the spark electrodes (2), ionisation probe (3) and ceramics
for signs of contamination or damage, replace as necessary.
▶ If necessary, clean the spark electrodes and ionisation probe with a
plastic scouring pad.
▶ Re-assemble with a new electrode gasket (1),
46
1.
Fig. 97 Electrode assembly

6.8.13 BURNER HOUSING, BURNER/ GASKET

To remove the burner housing.
1. Release and remove the four spring pins from the castellated nuts.
2. Undo the front two castellated nuts/springs and remove and retain
Fig. 98 Burner housing
3. Pull the burner housing up and forward to remove.
To remove the burner and gasket.
1. Lift the gasket (1) and burner mesh (2) from the heat exchanger body.
▶ When fitting the burner, ensure that the convex side of the burner
▶ Always fit a new gasket (1) when re-assembling the heat exchanger.
1
2.
2
1.
The front two bolts retaining the burner housing are NOT
captive and will drop out when the nuts are removed.
along with the front two bolts (1).
Slacken the two rear castellated nuts/springs, but do not remove.
2.
1
3.
faces down into the heat exchanger.
Greenstar i System Compact - 6 720 807 726 (2013/05)
3
1.