Worcester 28i Junior Especificações descarregar pdf (Página 16)

15 Primary [ch] Sensor

Remove the clip-on facia cover and the cabinet. Lower the facia

onto the support lugs.

Carefully pull-off the connections. Release the clip and remove

the sensor. Refer to Fig. 58.

Do not omit the heat transfer paste when fitting the replacement

sensor.

16 Primary Overheat Thermostat

Remove the clip-on facia cover,cabinet and the inner casing

cover.

Carefully pull-off the connections. Unscrew the two screws and

remove the thermostat and fixing bracket. Refer to Fig. 59.

Apply a small quantity of heat transfer paste to the face of the

replacement thermostat.

Carefully position the thermostat so that the connections are

away from the flue hood.

17 DHW Sensor

Remove the clip-on facia cover and cabinet. Lower the facia onto

the lower support lugs.

Carefully pull off the connections. Unscrew the clip and remove

the sensor.

Apply a small quantity of heat transfer paste to the face of the

replacement sensor. Refer to Fig. 60.

18 Pump

Check that the system valves have been shut and the appliance

has been fully drained. NOTE: A little water will remain in some

components.

Remove the clip on facia cover and cabinet. Place the facia con-

trol panel onto the lower support lugs.

Remove the burner as described in Section 16.4 preceding.

Disconnect the flexible hose at the relief valve assembly.

Pull out the clip to disconnect the pressure gauge capillary head.

Refer to Fig. 52.

Raise and remove the clip securing the by-pass pipe to the cen-

tral heating flow pipe. Refer to Fig. 52.

Pull out the flat clip securing the brass fitting at the top of the pump.

Unscrew the fitting from inside the combustion chamber. Refer to

Fig. 41.

Undo the union connection beneath the pump and carefully

withdraw the pump. Take care when releasing the by-pass pipe.

Support the pump and disconnect electrically.

Transfer the by-pass pipe, expansion vessel flexible connector

and the drain point and pressure gauge connector to the new

pump. Transfer the inlet and outlet connections. Use new O-rings

and seals where necessary.

Reconnect the electrical leads.

Fit the new pump assembly in the reverse order using new O-

rings and seals where necessary.

Do not forget to re-connect the

expansion vessel flexible pipe to the

relief valve assembly. Refer to Fig. 17.

Alternatively:

Unscrew, using a 4mm Allen to release the four fixing screws,

and remove the pump head. Refer to Fig. 45.

Access is improved if the pressure gauge head and bracket are

temporarilly removed.

Transfer the electrical connections to the new pump head and

set the speed at maximum.

Refit the pump head taking care not to scratch the pump mating

faces.

Open the system valves and re-fill, re-pressurise and fully vent the

appliance and the system ensuring that there are no air-locks.

19 Expansion Vessel

It will be necessary to remove the appliance from the wall to

replace the expansion vessel.

Alternatively the specified replacement can be fitted into the

heating system return as close to the appliance as possible.

Re-fill and pressurise the system as described in Section 13

Commissioning.

Fig. 58. Primary (CH) sensor.

1. Primary Sensor

2. Fixing clip

3. Flow pipe

Fig. 59. Overheat thermostat

1. Heat exchanger manifold

2. Overheat thermostat

3. Fixing clamp

4. Water pressure switch connection point

Fig. 60. DHW sensor

1. DHW sensor

2. DHW sensor fixing clip

and screw

IMPORTANT

11.9 Measure and Cut the Ducts.

General

: Cut the ducts as necessary, ensuring that the cuts are

square and free from burrs. Always check the dimensions before

cutting.

Measure the distance L. Refer to Fig. 20, 21, 22 and 23.

The standard flue can be telescopically adjusted to any length

between 425mm and 725mm measured from the centre of the

turret without the need to cut the ducts.

Fix the flue assembly together using the self-tapping screws

provided. Refer to Fig. 20.

It will only be necessary to cut the standard assembly if L is less

than 425mm. Cut the flue turret assembly and

the terminal

assembly by the same amount eg. if L=350 – remove 75mm

(425

— 350) from each assembly.

It is not necessary to cut the ducts

If L is between 1175 - 1475mm (1 extension)

1925 - 2225mm (2 extension)

2675 - 2975mm (3 extension)

It will be necessary to cut the ducts

If L is between 725 - 1175mm (1 extension)

1475 - 1925mm (2 extension)

2225 - 2675mm (3 extension)

It is necessary to shorten the assembly by cutting the first

extension duct assembly eg. L = 1000mm — remove 175mm

from the air and flue ducts (1175 – 1000 = 175mm).

NOTE: Extension duct measurements do not include the

socketed end. Unless specifically instructed the socketed end

must not be removed.

Fix the flue ducts together before fixing the surrounding air duct.

The cut ducts fit into the terminal assembly.

11.10 Fitting the Flue Assembly with Access to the Terminal.

Prepare the flue duct assembly as described in Section 11.8.

Apply the plastic tape to the air duct to be in contact with the

external brickwork.

From inside push the assembly through the wall. Align the flue

turret and push fully onto the spigot on the appliance. Tighten

the clamping ring. Refer to Fig. 24.

Make good the internal wall face and the external brickwork or

rendering.

Fig. 21. Extension duct

Fixing screw

Flue

turret

assembly

Appliance casing

Terminal

assembly

Fixing screw

Ducts of equal length

Fig. 22. Flue duct length - side

Flue

turret

assembly

Terminal

assembly

Flue

turret

assembly

Terminal

assembly

Fig. 23. Flue duct length - rear

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

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