Worcester 28i Junior Spezifikationen PDF herunterladen (Seite 15)

20 Auto Air Vent

Remove the complete pump assembly as described in Section

16.18. Take care not to strain the electrical connections.

Pull out the clip securing the auto air vent cartridge. Refer to Fig 52.

Do not omit the O-ring when fitting the new cartridge.

Refit the pump assembly as described in Section 16.18 preceding.

21 Primary Heat Exchanger

Check that the appliance has been fully drained.

Remove the temperature sensors as described in 15.15, 16 and

17 preceding.

Remove the combustion chamber cover, fan and flue hood and

burner as described in Section 15.3, Inspection and Servicing.

Remove the combustion chamber insulation side panels.

Prise off the fixing clips securing the copper pipes.

Remove the heat exchanger.

Do not omit the O-rings when fitting the replacement heat

exchanger. Refer to Fig. 61.

Check that the rear seal for the flue hood is in good condition

and secure before replacing the flue hood.

22 Air pressure switch

Pull-off the silicone sensing tubes.

Unscrew the fixing bracket and remove the pressure switch. See

Fig 62.

Unscrew and remove the fixing clip and fit to the new air pres-

sure switch ensuring that the orientation of the switch to the air

connections is the same.

Refit the switch assembly.

Remove the electrical connections from the old switch and fit to

the new switch in the same position.

Refit the silicone sensing tubes - the red tube fixes to the rear of

the switch.

23 Sight Glass

Remove and replace the inner casing cover complete.

Inspection and Servicing. Refer to Section 15.

Fig. 61. Primary heat exchanger

1. Heat exchanger 4. Overheat thermostat

2. O-ring (4) 5. Central heating flow and return

3. Fixing clip (4) 6. Domestic hot water inlet and outlet

Fig. 62. Air pressure switch

1. Air pressure switch

2. Tube connectors

3. Electrical connections

4. Air pressure switch fixing bracket

5. Fixing screw

OPAQUE

RED

11.8 Air and Flue Duct Preparation

11.8.1

The method of installation of the flue system may be

varied to suit the actual site conditions. The instructions for

connecting and fixing the ducts must, however, be strictly

followed.

Remove all packing material from the flue components.

11.8.2

11.8.3

Fit the flue restrictor ring by unscrewing the flue spigot

from the boiler. Refer to Fig. 19.

The standard telescopic flue assembly is suitable (without

cutting) for flues from 425mm up to 725mm measured from the

centre-line of the boiler flue outlet to the outer face of the wall.

Refer to Fig. 20.

The minimum length of the standard flue, after cutting is 275mm.

If L is greater than 725mm then extension duct kit/s will be required

- each kit extends the flue by 750mm up to a maximum of 3000

mm.

EXTENSION MAXIMUM FLUE LENGTH mm

1 1475

2 2225

3 2975

Fig. 19. Flue spigot and restrictor

Fig. 18. Inner case and facia fixing

Fig. 20. Standard flue assembly

Fixing screw

Flue

turret

assembly

Appliance casing

Telescopic adjustment

Terminal

assembly

1. Inner casing cover

2. Control panel fixing screws (2)

3. Inner casing cover fixing screws (2)

4. 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 (2)

10. Bottom support lug (2)

RESTRICTOR RINGS

Flue length 24i 28i

Horizontal up to 1m 76mm 80mm

Horizontal above 1m None None

Vertical terminal and up to 1m flue 76mm 80mm

Vertical flue greater than 1000mm None None

1. Flue spigot fixing screws

2. Flue spigot

3. Restrictor ring

4. Flue spigot fixing holes

Fig. 17 . Relief valve discharge connection

1. Relief valve 6. Expansion vessel

2. Relief valve discharge connection securing clip

3. Relief valve securing clip 7. Flexible connector from

4. System connection point pump with O-ring

5. Expansion vessel connection 8. System connection

securing clip

IMPORTANT

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 21 22

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