Baxi Combi 130 HE Installation & Servicing Instructions Manual page 36

Flowswitch
Clip
Fig. 58
Flow Thermistor (Red Body)
Safety Thermostat (Black Body)
Electrical
Connections
Fig. 59
ReturnThermistor
(Red Body)
Fig. 59a
Expansion Vessel
36
Flow Pipe
Fig. 60
13.0 Changing Components
13.3
1. Drain the boiler
2. It may be necessary to remove the expansion
vessel (see Section 13.5).
3. Remove the clip securing the flow pipe to the
flowswitch.
4. Remove the two screws securing the flow
switch to the boiler.
5. Disconnect the inline electrical connection.
6. Remove the flowswitch.
7. Fit the new flowswitch and reassemble in
reverse order.
8. Recommission the boiler and check the
inhibitor concentration (see Section 6.2 and 10.1).
13.4
1. The procedure is the same for both the
thermistors and the safety thermostat, although
the components are not interchangeable.
2. Remove the electrical connections from the
Expansion Vessel
component.
Connection
3. Unscrew the component from the pipe.
4. Fit the new thermistor or safety thermostat and
reassemble in reverse order.
13.5
1. Drain the boiler
2. Loosen the securing screw at the base of the
expansion vessel.
3. Whilst supporting the vessel undo the
expansion vessel connection and retain the
sealing washer.
4. Remove the expansion vessel.
5. Fit the new expansion vessel and reassemble
in reverse order.
13.6
1. The charge pressure is 1.0 bar.
2. Close the central heating flow and return
isolating valves.
3. Drain the boiler
4. The "Schraeder" valve is positioned centrally at
the side of the appliance. Pressurise to 1.0 bar.
Expansion Vessel
5. Open the isolating valves and recharge the
Securing Screw
system to between 1.0 bar and 2.5 bar. Vent the
system as necessary.
Flowswitch (Fig. 58)
(see Section 13.1 paragraph 2 & 3).
Flow or Return Temperature
Thermistors and Safety Thermostat
(Figs. 59 & 59a)
Expansion Vessel (Fig. 60)
(see Section 13.1 paragraph 2 & 3).
Re-pressuring Expansion vessel
(see Section 13.1 paragraph 2 & 3).