Hydraulic Block Removal; Ch Pressure Relief Valve - Worcester GREENSTAR 24i Junior Installation Instructions Manual

SERVICE AND SPARES

6.8.25 HYDRAULIC BLOCK REMOVAL

Remove the syphon assembly.
Refer to Syphon assembly removal page 59
B Ensure the appliance has been fully drained .
B Disconnect the electrical connections to the NTC
sensor, turbine and pump.
B Undo the nuts securing the copper water pipes to the
manifold (there is no need to remove the gas pipe).
B Remove the syphon.
B Release the spring clip securing the expansion vessel
pipe to the plastic housing and remove the pipe.
B Release the spring clip securing the pressure gauge
sensing head to the plastic housing and remove the
sensing head.
1. 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).
This is not essential but makes the removal
of the hydraulic block easier.
B Lower the pressure relief connector by pulling the
lever forward and down.
2. Undo the two screws securing the hydraulic block to
the chassis (located top left / top right of the
housing).
1.
2.
Fig. 119 Hydraulic block removal part 1
3. Lift the left hand side of the block slightly.
4. Manoeuvre the block out, starting at the right hand
side.
62
B Take care not to snag the harness.
3.
Fig. 120 Hydraulic block removal part 2
B To refit, follow the above in reverse. Ensure any seals
that have been disturbed are renewed.

6.8.26 CH PRESSURE RELIEF VALVE

B Remove the hydraulic block from the boiler (See
6.8.25 Removing the Hydraulic Block).
1. Release the spring clip from the Pressure Relief Valve
housing.
2. Withdraw the Pressure Release Valve from its
housing.
2.
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Fig. 121 PRV removal
B To refit, follow the above in reverse. Ensure any seals
that have been disturbed are renewed.
4.
The block will still contain an amount of
water, which will spill out if the block is
tilted.
2.
6 720 644 741a (2010/10)
1.
6720643895-105.1Wo