Worcester 28i Junior Especificações descarregar pdf (Página 17)

9 Inlet Water Filter and Flow Restrictor

Remove the flow turbine as described in 16.8 preceding.

Taking care, remove flow restrictor assembly from the flow

turbine. Carefully clean wire mesh by back flushing with water or

replace assembly if necessary. Refer to Fig. 55.

10 Control Board

Check that the appliance is electrically isolated.

Remove the clip-on facia cover, cabinet and the connections

cover. Carefully disconnect all the electrical connections. Refer to

Fig. 39.

Remove the facia panel unscrew the four screws and remove the

cover from the rear of the facia.

Lift out the control board. Refer to Fig. 56.

Pull out and transfer the transformer to the board.

Re-commission the appliance to check and set the burner

pressures. Refer to Section 13, Commissioning.

11 Transformer

Unscrew the four screws and remove the cover from the rear of

the facia as described in 16.10 preceding.

Pull out the transformer. Refer to Fig. 56.

12 Clock/Programmer

Remove the clip-on facia.

Remove the clock/programmer assembly by releasing the clip at

the top of the clock/programmer and ease away from the

control panel being careful not to pull on the connector lead.

Unplug the connector at the control board. Refer to Fig. 57.

Comprehensive instructions are sent with the new control.

13 Fan

Remove the inner casing cover.

Remove the fan as described in Section 15.4, Inspection and

Servicing.

Ensure that all the connections are correctly made to the new

fan.

14 Air Flow Detector

Remove the fan as described in Section 15.4.13 Inspection and

Servicing.

Unscrew and withdraw, through the fan outlet, the airflow

detector. Refer to Fig. 42.

Fig. 56. Control board

Fig. 55.Inlet water filter

1. Control panel 4. Transformer

2. Rear cover 5. Control board

3. Rear cover fixing screws (4)

Fig. 57. Programmer connection

1. Facia

2. Control panel (boiler outer casing in place)

3. Programmer cover

4. Programmer location

5. Programmer connections

6. Programmer connector plug

7. Programmer

1. Filter

2. Restrictor

11.11 Fitting of the Flue Assembly without access to the Terminal.

The rubber gasket kit is available from Worcester, Bosch Group.

NOTE: A larger diameter (150mm) opening in the wall is

required. Refer to Table 2.

Prepare the flue assembly as described in Section 11.8.

Fit the rubber sealing gasket centrally onto the terminal

assembly and tighten the clamp. Refer to Fig. 25.

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

external brickwork.

From inside push the assembly through the wall so that the

gasket flange is against the outer face. Refer to Fig. 25.

It may be necessary to adjust the legs of the flue centering ring.

Align the flue turret and push fully onto the socket on the

appliance. Tighten the clamping ring. Refer to Fig. 24.

Seal the gap around the duct at the inner wall face with the

flexible seal provided and make good.

11.12 Flue Bends.

90° and 45° bends are available. A maximum of two bends may

be used in addition to the first bend on the flue turret.

A 90° bend is equivalent to 750mm of straight duct.

A 45° bend is equivalent to 375mm of straight duct.

The maximum flue assembly is 2250mm with 1x90° bend and

1500mm with 2x90° bends.

Measure the lengths X,Y and Z. Refer to Fig. 26.

The maximum value of X using the turret assembly only is 506mm.

Reduce the ducts to the appropriate length eg. X = 406mm, cut

100mm from the air duct and 120mm (to cover the entry into the

45° or 90° elbow) from the flue duct. Refer to Fig. 27.

NOTE: The flue system ducts between the elbows, dimension Y,

requires the socketed ends (of the first extension if two or more

are used) to be removed and the air and flue tubes to be cut to

the same length.

Cut the ducts to a length Y – 162mm. Refer to Fig.26.

The final section, dimension Z, of the flue system must include a

section of plain duct assembly eg. an extension assembly with

the sockets removed. Reduce the final section, including the

terminal assembly, by the appropriate amount eg:

Air duct Z - 81mm and the flue duct Z – 51mm. Refer to Fig.26.

If Z is less than 425mm it will be necessary to cut the air and flue

ducts of the extension to a plain length of 100mm and reduce

the length of the terminal assembly eg. Z=350mm - remove

75mm from the terminal assembly.

Fig. 24 . Flue Turret Fixing

1. Flue turret assembly

2. Clamp

3. Appliance

Fig. 25 . Terminal assembly for internal

fitting of the flue.

Flue Terminal

Rubber sealing

gasket

Clamping ring

Flue terminal

Air duct

Flue duct

Rubber sealing gasket

Fixing clamp

Fig. 26. Flue bends

Y-162

Plain tube

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Worcester 28i Junior Especificações Página 17

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