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Clean the Gas to Water Heat Exchanger. Cover the burner

manifold hole in the combustion chamber bottom panel with a

cloth. Clean the heat exchanger using a soft brush. Remove the

deposits from the bottom of the combustion chamber. Do not

distort any of the blades.

Combustion Chamber Insulation. Examine and replace any

pads that are damaged. Remove any dust or deposits using a

soft brush after first dampening the pads.

Reassemble the appliance in the reverse order.

Check that all components are in place and correctly fixed. Leave

the cabinet front panel to be fitted after checking the operation

of the appliance.

15. 5 TEST THE APPLIANCE

On completion of the service and reassembly of the appliance,

check for gas soundness and the correct operation of the

appliance as described in Section 13 - Commissioning.

Refit the cabinet front panel and reset the controls to the users

requirements.

16.1 SAFETY

Switch off the electricity and gas supplies before replacing any

components. After the replacement of any components, check

for gas soundness where relevant and carry out functional

checks as described in Section 13 - Commissioning

16.2 COMPONENT ACCESS

To replace components it is necessary to remove one or more

sections of the cabinet and cover plates within the appliance as

described in Section 15.3. Any 'O' ring or gasket that appears

damaged must be replaced. Complete gasket and 'O' ring packs

are available for the gas and water connections on the appliance.

The facia panel may also need to be hinged down as described in

Section 15.3, c.

16.3 DRAINING THE APPLIANCE

Check that the electricity supply to the appliance is turned off.

Before removing any component holding water it is important

that as much water as possible is removed from the appliance.

(a) Central Heating Circuit. Turn off the central heating flow and

return valves at the appliance. Fit tubes to the drain taps on the

flow and return manifolds and open the drain taps about one

turn, make sure that the dust cap on the auto air vent is

loosened. See Fig. 18. Close the drain taps when the flow has

stopped. Be careful not to overtighten the drain taps. Some

water will remain in the expansion vessel, pump, diverter valve,

water to water and Gas to Water heat exchangers and extra care

must be taken when removing these components.

(b) Domestic Hot Water Circuit. Turn off the mains cold supply

valve at the appliance and open the lowest hot water tap. A

quantity of water will remain in the Water to Water heat

exchanger and the diverter valve and extra care must be taken

when removing these components.

Replace any components removed from the appliance in the

reverse order using new gaskets/'O' rings/sealant where

necessary. Always check that any electrical connections are

correctly made and that all screws are tight.

16.4 COMPONENT REPLACEMENT

1. Automatic Air Vent. See Fig. 34

Remove the inner casing cover as described in Section 15.3, b.

Drain the central heating circuit as described in Section 16.3, a.

Remove the circlip and lift the assembly from the appliance.

Unscrew air vent from the pipe.

Fit the replacement assembly, making sure the ‘O’ ring is in good

condition. Replace if necessary.

Ensure that the circlip is correctly fitted and the dust cap is

loosened.

Open the valves and fill and re-pressurise the system as

described in Section 13.2.

2. Air Flow Pressure Switch. See Fig. 33.

Check that the electricity supply to the appliance is turned off.

Remove the cabinet front panel as described in Section 15.3, a.

Carefully pull off the sensing tubes and the electrical connections

from the switch.

Unscrew the two screws underneath the gas valve and remove

the switch and bracket from the appliance.

Fit the replacement switch in the reverse order ensuring that the

electrical connections have been made to the correct terminals

on the switch. Check that the sensing tubes are fitted correctly.

3. Fan. See Fig. 31.

Check that the electricity supply to the appliance is turned off.

Remove the fan assembly as described in Section 15.3, e.

Fit the replacement fan in the reverse order.

16. Replacement Of Parts

Fig. 32. Burner and Electrode

(24/28CDi shown)

3-4mm

5-6mm

Spark

electrode

assembly

Spark electrode

detail

Flame

sensor

position

Flame sensor

detail

Burner injector

Burner

fixing nut

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 41 42

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