SERVICING

& SPARES

27.1

REPLACEMENT OF PARTS

 

 

27. Hydraulic Block

 

 

 

Ensure the appliance has been fully drained

 

 

 

(see draining the appliance).

 

 

 

Disconnect the electrical connections to the

 

 

 

NTC, Turbine and pump.

 

 

 

Undo the nuts securing the copper water

 

 

 

pipes to the manifold (there is no need to

 

 

 

remove the gas pipe)

 

 

 

Release the spring clips securing these

 

 

 

water pipes to the plastic housing and

 

 

 

remove the pipes.

 

 

 

Release the spring clip securing the

 

 

 

expansion vessel pipe to the plastic housing

 

 

 

and remove the pipe.

27.2

 

 

Undo the nut securing the pressure gauge to

 

 

its bracket and remove the gauge.

 

 

 

Release the locking devices that secure the

 

 

 

two copper water pipes leading to the

 

 

 

combustion chamber by squeezing the two

 

 

 

tabs together and rotating anticlockwise

 

 

 

(viewed from above).

 

 

 

Remove the rubber pipe connecting the

 

 

 

sump and remove the syphon. NOTE: this is

 

 

 

not essential but makes the removal of the

 

 

 

block easier.

 

27.1

Undo the two screws securing the hydraulic

 

 

 

block to the chassis (located top left / top

 

 

 

right of the housing)

 

27.2

Lift the left hand side of the block slightly,

 

 

 

then manoeuvre the block out, starting with

 

 

 

the right hand side.

 

 

 

Take care not to snag the harness or

 

 

 

pressure gauge bracket.

 

 

NOTE: the block will still contain a small amount

 

 

of water, which will spill if the block is tilted.

 

 

 

To refit, follow the above in reverse. Ensure

 

 

 

any seals that have been disturbed are

 

 

 

renewed.

 

 

28. CH pressure relief valve

 

 

 

Remove the hydraulic block from the boiler

 

 

 

(See Removing the Hydraulic Block).

 

28.1

Remove the spring clip from the Pressure

 

 

 

relief valve housing.

 

28.2

Withdraw the pressure release valve (A) from

 

 

 

its housing.

 

 

 

To refit, follow the above in reverse. Ensure

 

 

 

any seals that have been disturbed are

 

 

 

renewed.

28.1

28.2

 

A

49

REPLACEMENT OF PARTS

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 24 i junior/28 i junior 8 716 107 336b (11/05)

Page 49 Page 51
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Bosch Appliances 28i junior, 24i junior manual 28.1 28.2, 27.1, Hydraulic Block, 27.2, CH pressure relief valve
Page 49 Page 51

28i junior, 24i junior specifications

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