Fan; Electrode Assembly And Burner; Re-Assembly Of The Burner Clamping Plate - Worcester GREENSTAR 24i Junior Installation, Commissioning And Servicing Instructions

6.8.8 FAN

Remove the air/gas manifold as described in the previous section.
1. Remove two screws retaining the fan to the air/gas manifold.
2. Remove the air/gas manifold.
3. Remove the screw.
4. Remove the retaining plate.
5. Remove three screws and the mixing chamber.
Re-assemble with new fan ensuring seals are correctly fitted.
3.
5.
5.
6.
5.
Fig. 100 Dismantling the air/gas manifold assembly
FLAP VALVE ASSEMBLY
1. Twist the mounting flange clockwise to release.
2. Pull mounting flange off the flap valve assembly.
3. Pull rubber flap off flap valve assembly.
▶ To replace the flap valve:
– Press the two lugs on the back of the flap into the two slots in the
flap valve assembly.
Fig. 101 Flap valve assembly
6 720 802 047 (2013/05)
2.
1.
1.
4.
6720643895-81.1Wo
3.
2.
1.
6720643895-117.1Wo

6.8.9 ELECTRODE ASSEMBLY AND BURNER

Refer to figure 102.
▶ Disconnect spark electrodes and flame sensor connection.
▶ Remove clamping plate.
1. Remove spark/flame electrode assembly from heat exchanger.
2. Remove the gasket from the top of the heat exchanger.
3. Remove the burner.
▶ Replace new burner in correct position.
▶ Ensure that burner tabs, as shown in figure 102, fit correctly their
respective locations.
1.
3.
Fig. 102 Electrode assembly and burner

6.8.10 RE-ASSEMBLY OF THE BURNER CLAMPING PLATE

NOTICE: Heat exchanger seal
▶ If the joint between the Air/Gas manifold and heat
exchanger is disturbed the sealing gasket must be
replaced.
▶ After re-assembly the combustion must be checked
using the procedure in the section 6.6 "Setting the
Air/Gas ratio".
▶ Ensure that the new gasket is fitted, with the electrode assembly and
gasket heat shield
CAUTION: Clamping plate
▶ Ensure that the clamping plate is firmly tightened
down on top of the heat exchanger.
▶ Locate the edge of the clamping plate [7] under the bracket [4] and
fit the retaining plate[1] hand tight
▶ Ensure that the retaining plate [1] is in the position shown in
figure 103
▶ At this point the Air/Gas Manifold/Fan assembly [8] should be fitted,
engage the lugs in the slots in the clamping plate and rotate clockwise
to the stop position.
▶ Rotate the retaining plate assembly [1] in the slot on the clamping
plate [2], this will prevent the Air/Gas manifold [8] rotating back
▶ Initially there will be a gap between the clamping plate and the top of
the heat exchanger, refer to figure 103
SERVICE AND SPARES
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