Worcester 28i Junior Spezifikationen PDF herunterladen (Seite 22)

Fig. 41. Inner case components

1. Flue hood

2. Overheat thermostat

3. Burner

4. Combustion chamber cover

5. Spark electrode assembly

6. Heat exchanger

7. Fan assembly

8. Air pressure switch

9. Flue gas sampling point

10. Combustion chamber cover fixing screws

11. Pump connection

15.4 Component Access

Isolate the electrical supply at the mains and turn off the gas

supply at the gas service cock on the appliance before starting

any service procedures.

Always test for gas soundness after the service has been

completed.

To service the appliance it may be necessary to remove some

or all of the following parts to gain access to components

which may need to be checked or replaced.

Cabinet Pull off the clip-on facia cover. Unscrew the two

screws and release the cabinet sides. Lift up and

away from the top locating pegs. Refer to Fig. 14

and 15.

Facia Panel Unscrew the single screw, lift off and reposition

onto the lower support lugs. Refer to Fig. 18 and 40.

Fig. 40. Facia in service position

—

Hand over the User Booklet and the completed

Benchmark Logbook and/or, in Eire, the Declaration .

Explain how to operate the appliance safely and efficiently.

Tell the user what to do if the appliance is not to be used in very

cold conditions.

Tell the user what to do if the system pressure falls.

Explain that regular servicing will maintain the safe and efficient

operation and extend the life of the appliance. Worcester, Bosch

Group or their agent can offer a comprehensive maintenance

contract.

Tell the user that any work on the appliance must only be

carried-out by a competent, CORGI (in the UK) registered, person.

15.1 To ensure continued efficient operation of the appliance it

must be checked at regular intervals. The frequency of servicing

will depend upon the particular installation conditions and usage,

but once per year should generally be adequate. The extent of the

service required by the appliance is determined by the operating

condition of the appliance when tested by fully qualified engineers.

Any service work must be carried out by competent registered

engineers (CORGI in GB).

15.2 Inspection

Check that the terminal and the terminal guard, if fitted, are clear

and undamaged.

If the appliance is in a compartment or cupboard check that the

specified service space around the appliance is clear. Refer to Table 8.

Check all the joints and connections in the system and remake

any that show signs of leakage. Refill and re-pressurise as

described in Section 13-Commissioning.

Operate the appliance and take note of any irregularities. Refer to

Section 19-Fault Finding for rectification procedures.

15.3 Combustion performance

It is not normally necessary to check the combustion

performance of the appliance. A sampling point is, however,

provided. Refer to Fig. 38.

The combustion performance figures given are for guidance.

Remove the cap from the sample point on the top of the

appliance.

Connect the approved sampling meter.

With the appliance at maximum rate and stable in the DHW

mode expect readings of:

NG CO

2 6.5—7.5% CO 0.002—0.010%

LPG CO

2 7.5—8.5% CO 0.002—0.010%

NOTE: For flues greater than 725mm without a restrictor the CO2

may be up to 0.5% lower.

These figures cover all flue conditions.

Refit the cap after the test.

15. Inspection And Service

Fig. 37. Facia controls

1. Central Heating temperature control and On/Off knob

2. System pressure gauge 5. Fault indicator and

3. Burner ON indicator reset button

4. Optional timer 6. User guide location

Fig. 39. Inner case and facia fixing

1. Inner casing cover

2. Cabinet fixing screws (2)

3. Inner casing cover fixing screws (2)

4. Facia control panel

5. Controls connector cover

6. Controls connector cover fixing screws (2)

7. Programmer (optional)

8. Facia control panel fixing screw

9. Top support lug

10. Bottom support lug

Fig. 38. Combustion Test Point

14. Hand Over

1. Flue connections

2. Combustion products test point

1 2 ... 17 18 19 20 21 22

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