Worcester 28i Junior Especificações descarregar pdf (Página 6)

Remove combustion

chamber cover.

Is the sense electrode

and lead in good

condition and is gap

correct?

Replace flame sensor

or wiring.

Remove multiway

connector from board

position ST16.

Is there continuity

from pin 10 (white

wire) to flame sensor?

Yes

Replace control board.

NOTE: It is not

possible to reliably

check the cross-light

performance of the

burner or the

efficiency of the

gas/water heat

exchanger.

If there is still a

problem, investigate

flue problems or

replace burner or

injector or heat

exchanger.

Check the flashing

fault signal occur at

the start of a demand.

Check flashing occurs

at the end of a

demand.

Gas valve leak is

detected.

Yes

Check flashing occurs during

a demand.

Pump could be partially

blocked.

Clean pump & flush system.

Re-fix sensor to pipe.

Turn off boiler. Remove

inner casing cover and

check position of

primary sensor (on

heat exchanger in

front of overheat

thermostat).

Is it correctly fixed to

pipe?

Yes

PERFORMANCE SPECIFICATIONS 24i 28i

PRIMARY WATER CAPACITY litres 3 3

IP RATING (WHOLE OF BOILER) IP 20 IP 20

MAXIMUM MAINS INLET PRESSURE bar 10 10

MINIMUM MAINS INLET PRESSURE (WORKING) FOR MAXIMUM FLOW bar 0.9 0.9

MINIMUM MAINS INLET PRESSURE (WORKING) FOR OPERATION bar 0.1 0.1

DOMESTIC HOT WATER TEMPERATURE RANGE °C 55 55

MAXIMUM CENTRAL HEATING FLOW TEMPERATURE °C 82 (nom) 82 (nom)

MAXIMUM CENTRAL HEATING SYSTEM SET PRESSURE bar 2.5 2.5

MINIMUM CENTRAL HEATING SYSTEM PRESSURE bar 0.5 0.5

OUTPUT TO CENTRAL HEATING & DHW kw NATURAL GAS (G20) 23.5 27.5

LPG - PROPANE (G31) 23.5 27.5

DOMESTIC HOT WATER SPECIFIC RATE - 30°C RISE l/min 11.2 13.1

MAXIMUM DOMESTIC HOT WATER FLOW RATE - 40°C RISE l/min 8.4 9.8

FLUE GAS MASS FLOW RATE 15.2 17.8

FLUE GAS TEMPERATURE °C 150 150

NOx CLASSIFICATION FOR BOTH 24i & 28i Class 2

SEDBUK NUMBER NG 78.0 78.9

SEDBUK NUMBER LPG 80.4 82.1

SEDBUK BAND* D D

GAS SUPPLY SYSTEM - BASED ON NG (G20)

TOTAL LENGTH OF GAS SUPPLY PIPE (COPPER) metres

3 6 9 12

GAS DISCHARGE RATE - PRESSURE DROP 1 mbar. — m

/h PIPE DIAMETER mm

8.7 5.8 4.6 3.9 22

18.0 12.0 9.4 8.0 28

Table 7

CLEARANCES (mm)

INSTALLATION SERVICE UNVENTILATED COMPARTMENT

*ABOVE FLUE ELBOW 30 30 30

BENEATH THE APPLIANCE 200 200 200

IN FRONT OF APPLIANCE 600 600 25**

RIGHT/LEFT HAND SIDE 10 10 25

Table 8

SYSTEM CAPACITY

TOTAL SYSTEM VOLUME litres

INITIAL INITIAL CHARGE PRESSURE bar

PRESSURE bar 0.5 1.0 1.5

1.0 57 75 N/A

1.5 31 42 52

Table 9

Refer to Section 6.

* If vertical flue then 200mm above top of boiler.

** Front clearance is to a removable panel (eg. door).

DOMESTIC HOT WATER TEMPERATURE RISE

DISCHARGE RATE l/min 7 8 9 10

TEMPERATURE RISE °C 24i 48 42 37 34

TEMPERATURE RISE °C 28i 56 49 44 39

Table 6

Table 5

* The value is used in the UK Government Standard Assessment Procedure [SAP] for the energy rating of dwellings. The test data from

which it has been calculated have been certified by the GASTEC notified body.

1 2 3 4 5 6 7 8 9 10 11 ... 21 22

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