Worcester GREENSTAR 30 HE Service Manual download pdf (Page 37)

6 720 611 400 GB (03.11)

Maintenance

9.2 Description of servicing operations

The combustion performance must be checked before

and after any servicing work on the combustion and

burner components. Refer to section 8.2.

Checking the ionisation current,

Service Function 3.3

B Select Service Function 3.3. (See page 30 “Display-

ing Service Functions”)

If the display shows ‘Meduim’ or ‘High’ while the boiler

is firing, the ionisation current is OK. If the display

shows ‘No’ or ‘Low’ while the boiler is firing, the elec-

trode assembly (32.1, page 6) must be cleaned or

replaced.

Domestic hot water

If, after checking the dynamic pressure, the flow rate is

too slow:

B remove the domestic hot water heat exchanger and

replace,

B Before removing the heat exchanger shut the inlet

valve and drain the hot water circuit.

B Use new seals when replacing the heat exchanger.

Fig. 44

Primary Heat exchanger

There is a special accessory kit (no. 840) for cleaning

the heat exchanger, order no. 7 719 001 996.

B Check control pressure on the air - gas mixer unit at

max. rated heat output using an electronic manome-

ter.

Fig. 45

B Remove cleaning access cover (415, page 6) and

the metal plate below it, if present. Refer to fig. 2.

B Unscrew condensation trap and place suitable con-

tainer underneath. Refer to fig. 46.

B Remove the fan and the burner as described in the

text headed “Burner” (see page 38).

Fig. 46

7 181 465 330-06.1R

The heat exchanger should only be

cleaned if the control pressure is

5.2 mbar (R30 HE plus)

5.3 mbar (R35 HE plus)

6.2 mbar (R40 HE plus)

(depression) or less.

6 720 610 332-69.1R

6 720 610 332-72.1R

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Worcester GREENSTAR 30 HE Service Manual Page 37

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