Drain Tap; Pressure Gauge; Hydraulic Block Removal - Worcester GREENSTAR 24i Junior Installation, Commissioning And Servicing Instructions

6.8.24 DRAIN TAP

▶ Ensure the appliance has been fully drained.
1. Rotate the drain tap fully anti-clockwise and push in.
2. Withdraw the drain tap from its housing
6.
2.
5.
Fig. 127 Drain tap and pressure gauge removal
▶ Apply silicone lubricant to the seals to ease assembly.
▶ To refit, follow the above in reverse. Ensure any seals that have been
disturbed are renewed.

6.8.25 PRESSURE GAUGE

▶ Refer to figure 127
▶ Ensure the appliance has been fully drained (see draining the
appliance).
3. Prise the lugs apart (3) securing the pressure gauge to the fascia.
4. Remove the gauge (4) taking care not to damage or kink the capillary.
5. Withdraw the spring clip from the pressure sensing head housing.
6. Remove the pressure sensing head and pressure gauge capillary from
the housing.
NOTICE: Heat damage
▶ Route the plastic capillary tube away from the pump
to ensure that the pipe is not melted against a hot
pump body.
▶ To refit, follow the above in reverse. DO NOT omit the washer from the
capillary when fitting a replacement gauge.

6.8.26 HYDRAULIC BLOCK REMOVAL

Remove the syphon assembly.
Refer to Syphon assembly removal page 47
▶ Ensure the appliance has been fully drained.
▶ 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 syphon.
▶ Release the spring clip securing the expansion vessel pipe to the
plastic housing and remove the pipe.
▶ Release the spring clip securing the pressure gauge sensing head to
the plastic housing and remove the sensing head.
6 720 802 047 (2013/05)
1.
4.
3.
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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 anti-clockwise (viewed from above).
This is not essential but makes the removal of the
hydraulic block easier.
▶ 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. 128 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.
▶ Take care not to snag the harness.
3.
4.
Fig. 129 Hydraulic block removal part 2
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.
SERVICE AND SPARES
2.
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