Ch Pressure Relief Valve - Worcester GREENSTAR 25Si Instruction Manual

A
B
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 25Si/30Si
8 716 115 165a (06/2008)
25.1
C
REPLACEMENT OF PARTS
24.1
NOTE:
Remove the syphon assembly.
To release the syphon from the sump connection,
pull towards you (A).
Disconnect the discharge hose (B) at the
plumbing manifold.
Remove the complete syphon assembly.
24. Hydraulic Block
Ensure the appliance has been fully drained .
Disconnect the electrical connections to the
NTC, Turbine and pump.
Undo the nuts securing the copper water
24.2
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.
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.
24.1 Undo the two screws securing the hydraulic
block to the chassis (located top left / top
right of the housing)
24.2 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.

25. CH pressure relief valve

Remove the hydraulic block from the boiler
(See Removing the Hydraulic Block).
25.1 Remove the spring clip from the Pressure
25.2
relief valve housing.
25.2 Withdraw the pressure release valve (C) from
its housing.
To refit, follow the above in reverse. Ensure
any seals that have been disturbed are
renewed.
REPLACEMENT OF PARTS
51