Bosch Appliances 28i junior Replacement Of Parts, 28.1, 28.2, 27.1, Hydraulic Block, 27.2, Spares

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

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REPLACEMENT OF PARTS

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