Pressure Gauge; Hydraulic Block Removal - Bosch Condens 5000W Installation And Maintenance Instructions Manual

Servicing and spares

6.8.21 Pressure gauge

▶ Ensure the boiler is fully drained.
Refer to figure 101.
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:
Risk of heat damage
▶ Route the plastic capillary tube away from the pump to ensure that
the pipe is not melted against the hot pump body.
▶ To refit, follow the above in reverse. Do not forget to fit the washer
from the capillary when fitting a replacement gauge.

6.8.22 Hydraulic block removal

Remove the syphon assembly.
▶ Refer to syphon assembly removal page 50.
▶ Ensure the boiler has been fully drained.
▶ Disconnect the electrical connections to the NTC sensor and pump.
▶ Undo the nuts securing the copper water pipes to the manifold (there
is no need to remove the gas pipe).
Refer to figure 111.
1. Release the spring clips securing these water pipes to the plastic
housing and remove the pipes.
▶ 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.
▶ 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 block easier.
▶ Remove the rubber pipe connecting the sump and remove the
syphon.
52
2. Undo the two screws securing the hydraulic block to the chassis
(located top left / top right of the housing).
1.
2.
Fig. 111 Hydraulic block removal part 1
Refer to figure 112.
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.
Fig. 112 Hydraulic block removal part 2
▶ To refit, follow the above in reverse. Ensure any seals that have been
disturbed are renewed.
Bosch Condens 5000W – 6 720 646 195 (2018/10)
2.
6720644743-34.1Wo
4.
6720644743-35.1Wo