Bosch Worcester Greenstar CDi Compact ErP Series - DHW Pressure Relief Valve; DHW Plate Heat Exchanger; Hydraulic Block Removal; Bypass Valve

SERVICE AND SPARES
CDi Compact
ErP
- 6 720 813 276 (2015/07)56
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. 111 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. 112 Remove plate heat exchanger.
▶ When replacing the heat exchanger, ensure that any seals that have
been disturbed are replaced.
7.8.27 Hydraulic block removal
1. Squeeze the ratchet connector and rotate clockwise to release.
2. Release the pin on the expansion vessel connector at the pump
assembly.
3. Pull the expansion vessel up and secure in raised position.
4. Remove the clip securing the pump return to the heat exchanger.
5. Remove the two screws securing the CH pressure relief valve
mounting.
6. Remove the screws securing the hydraulic block assembly.
Fig. 113 Hydraulic block
7.8.28 Bypass valve
Remove the hydraulic block from the boiler.
1. Remove the clip on the return connection.
2. Remove the clip on the pump connection.
3. Remove the spring clip retaining the by-pass pipe.
4. Separate the return unit from the flow manifold.
5. Using a pair of pliers remove the by-pass valve.
Fig. 114 Bypass valve
▶ When re-assembling, in reverse order, ensure that any seals that
have been disturbed are replaced.
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.
6720646608-55.2Wo
1
2
1.
2.
6720813276-17.1Wo
1.
2.
Do not remove the hydraulic block assembly unless
absolutely necessary.
Before removal:
▶ Isolate the electrical power to the boiler.
▶Drain the boiler.
▶ Isolate the cold water mains and drain the DHW
circuit within the boiler.
6720646608-53.2Wo
1.
2.
3.
4.
6.
6.
5.
6720646608-60.2Wo
1.
4.
5.
3.
2.