Technical data

9 Parts replacement

Instructions for installation and servicing ecoMAX52

9.4 Replacement of gas valve

• Turn off boiler.

• Remove front casing.

• Lower control box.

• Remove burner, gas valve and fan assembly as pre-

viously detailed.

• Remove 4 screws (1).

• Separate gas valve and fan assembly from burner

manifold (2).

• Remove 2 screws (3) securing gas valve to fan.

• Disconnect gas inlet supply connection from gas valve

by removing four screws. Refit the gas inlet supply

connection to the new gas valve using the new sealing

gasket supplied.

• Fit new gas valve to fan using the new sealing gasket

supplied.

• Refit gas valve and fan assembly to burner manifold

using the new sealing gasket supplied. Equally tighten

the four screws (1) to ensure a good seal is made.

• Reassemble burner, gas valve and fan assembly in

reverse order.

• Recommission boiler as previously detailed. Ensure

combustion analysis is carried out after part replace-

ment as detailed in section 9.8.

Fig. 9.2 Replacing the gas valve

Fig. 9.3 Gas valve

9.5 Replacement of central heating expansion vessel

• Turn off boiler.

• Remove front casing.

• Lower control box.

• Drain boiler as previously described.

• Disconnect union (1) from expansion vessel.

• Remove two screws (2) and remove retaining bracket (3).

• Slide the expansion vessel forward to remove from the

boiler.

• Reassemble in reverse order.

• Recommission boiler as previously detailed.

Fig. 9.4 Replacing the expansion tank

83 41 77_12 GB04.04.qxd 22.09.2004 12:34 Uhr Seite 52