Worcester Greenstar 25Si Compact - Service and Spares (Continued); 7.8.23 Drain Tap; 7.8.24 CH Pressure Relief Valve; 7.8.25 DHW Pressure Relief Valve

SERVICE AND SPARES
Greenstar Si Compact
ErP
- 6 720 813 278 (2015/07)54
7.8.23 DRAIN TAP
▶ Ensure that the boiler is full drained down.
▶ The drain tap rotates anti-clockwise for a ¼ turn to open.
1. Rotate the drain tap fully anti-clockwise passed the ¼ turn stop point
to release.
2. Push in and withdraw from the housing.
Fig. 108 Drain tap
7.8.24 CH PRESSURE RELIEF VALVE
▶ Isolate the boiler and ensure that the boiler is fully drained.
1. Release the knurled connector from the bottom of the PRV.
2. Pull the captive clip to the left to release the PRV.
3. Pull the Central Heating pressure relief valve out of the housing.
▶ Replace in reverse order, secure with the clip and mounting screws.
Fig. 109 PRV
7.8.25 DHW PRESSURE RELIEF VALVE
1. Release the retaining clip
2. Pull the pressure relief valve (1) with the deflector (2) from the
housing.
▶ When replacing the DHW pressure relief valve, re-use the deflector
from the old PRV.
Fig. 110 DHW PRV
7.8.26 DHW PLATE HEAT EXCHANGER
1. Undo and remove the retaining screw.
2. Rotate the left hand side of the heat exchanger towards you and slide
out to the left.
Fig. 111 Remove plate heat exchanger.
▶ When replacing the heat exchanger, ensure that any seals that have
been disturbed are replaced.
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Before removal:
▶ Isolate the electrical power to the boiler.
▶ Drain the boiler.
▶ Isolate the cold water mains.
Before removal:
▶ Isolate the electrical power to the boiler.
▶ Isolate the cold water mains and drain DHW circuit
within the boiler.
▶ Drain the boiler.
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