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7.7.28 Hydraulic block removal
▶ Remove the Siphon assembly, refer to Siphon removal page 55.
Refer to figure 94
▶ Disconnect the electrical connections to the NTC sensor, turbine and
pump.
▶ Undo the nuts securing the copper water pipes to the manifold (there
is no need to remove the gas pipe).
▶ Remove the siphon.
▶ Release the spring clip [2] securing the expansion vessel pipe to the
plastic housing and remove the pipe.
▶ Release the spring clip [3] securing the pressure gauge sensing head
to the plastic housing and remove the sensing head.
▶ Release the locking devices that secure the two copper water pipes
leading to the combustion chamber by squeezing the two tabs
together and rotating anti-clockwise (viewed from above).
▶ Lower the pressure relief connector by pulling the lever forward and
down.
▶ Undo the two screws [1] securing the hydraulic block to the chassis
(located top left / top right of the housing).
▶ Lift the left hand side of the block slightly.
▶ Manoeuvre the block out, starting at the right hand side.
▶ Take care not to snag the harness.
The block will still contain an amount of water, which will
spill out if the block is tilted.
▶ To refit, follow the above in reverse. Ensure any seals that have been
disturbed are renewed.
1
3
2
Fig. 94 Hydraulic block removal
Greenstar i System
- 6 720 806 945 (2015/07)
ErP
7.7.29 CH pressure relief valve
Refer to figure 95
▶ Remove the hydraulic block from the appliance (See 7.7.28
Hydraulic block removal).
▶ Release the spring clip [2] from the Pressure Relief Valve housing.
▶ Withdraw the Pressure Release Valve [1] from its housing.
7.7.30 Bypass valve
Refer to figure 95
▶ Remove the hydraulic block from the appliance (See 7.7.28
Hydraulic block removal).
▶ Remove the spring clip [5] (on the left hand plastic housing to the
heat exchanger) of the copper bypass pipe [3].
▶ Undo the screw [4] securing the left hand plastic housing to the heat
exchanger.
▶ Move the housing to the left to free up the one end of the pipe.
▶ Remove the spring clip [8] (on the right hand plastic housing) of the
copper bypass pipe [3].
▶ Remove the pipe [3] from the right hand housing to reveal the bypass
valve [7]. Taking care not to lose the bypass pipe restrictor [6] from
inside the bypass pipe [3].
▶ Using a pair of pliers, pull out the bypass valve from the housing
▶ To refit, follow the above in reverse. Ensure any seals are renewed.
1
1
8
Fig. 95 PRV and bypass valve removal
Service and spares
2
3
5
7
6
4
6720806945-04.1Wo
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