Air Pressure Switch; Auto Air Vent; Gas Valve - Bosch Worcester Greenstar CDi Compact ErP Series Installation, Commissioning And Servicing Instruction

7.8.7

Air Pressure Switch

NOTICE: Air Pressure Switch
▶ Ensure that the tube is reconnected to the Air
Pressure Switch
To remove the Air pressure switch assembly:
▶ Slacken the two screws [1] but do not remove
▶ Remove the connector from the terminals [2]
▶ Disconnect the tube from the flue pipe
▶ Slide the assemble to left to release the retaining bracket
▶ Remove the assembly
1
2
Fig. 84
To remove and replace the Air pressure switch:
▶ Remove the two screws [5] retaining the switch to the bracket [4].
▶ Disconnect the tube [3] from the switch.
▶ Fit the new switch to the bracket and secure with the two screws [5].
▶ Re-connect the tube [3] to the switch, ensuring routing is looped as
in figure 84.
▶ Re-connect the connectors to the terminals [2].
▶ Align the Air pressure switch bracket [4] over the two screws [1] and
slide the assembly to the right, tighten the screws to secure.
5
Fig. 85
CDi Compact ErP - 6 720 813 276 (2015/07)
4
3
6720813276-07.1Wo
7.8.8

Auto air vent

Ensure that the boiler has been fully drained.
1. Remove the spring clip completely.
2. Lift the air vent out of the housing and remove.
Fig. 86 Auto air vent
When re-assembling ensure that the "O" ring is fitted to the Auto air vent
and NOT the heat exchanger, otherwise the Air vent will be difficult to fit.
Apply silicone grease to the "O" ring to ease assembly.
7.8.9

Gas valve

▶ Isolate the mains electrical supply and the gas supply at the boiler gas
cock.
▶ Remove the combustion air inlet pipe.
▶ Disconnect the electrical connector from the valve
1. Remove the gas pipe from the top of the valve.
2. Undo the bottom gas pipe connection.
3. Remove the screw securing the gas valve.
4. Lift the gas valve to clear the bottom gas connection.
5. Pull the gas valve forward out of the boiler.
4.
Fig. 87 Gas valve
▶ When fitting the new valve, start with the bottom gas connection and
tighten by hand before making any other connections to the valve.
▶ Secure the valve with the screw.
▶ Tighten the bottom connection firmly with a suitable spanner.
▶ Connect the top gas pipe.
▶ Reconnect the electrical connector.
▶ Open the boiler gas isolator.
▶ Check all the gas connections for gas tightness.
SERVICE AND SPARES
2.
1.
1.
5.
3.
2.
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