Baxi Combi 80e Installation And Servicing Instructions page 31

Electrical
Plug
Earth Wire
Inlet Pipe
Gas Feed
Pipe
Fig. 52
Flow Pipe
Central Heating
Temperature Sensor
Safety
Thermostat
Fig. 53
Fig. 53a
Gas Valve
Plate Heat
Exchanger
DHW Temperature
Sensor
12.0 Changing Components
12.8 Gas Valve (Fig. 52)
1. Undo the nut on the gas feed pipe under the
boiler.
2. Remove the securing screws and hinge the
facia panel down.
3. Disconnect the earth wire and pressure sensing
pipe from the valve. Undo the screw securing the
electrical plug to the valve and disconnect the
plug. Disconnect the wires from the valve
modulator.
4. Remove the screws securing the inlet pipe
flange to the boiler bottom panel and those
securing the outlet manifold to the burner
manifold.
5. Remove the valve from the boiler.
6. Note the orientation of the inlet pipe and outlet
manifold. Undo the securing screws and remove
the pipe and manifold.
7. Examine the 'O' ring seals for damage,
replacing as necessary.
8. Fit the inlet pipe and outlet manifold to the new
valve, ensuring that the 'O' ring seals are in place.
9. Reassemble in reverse order and check the
burner pressure (Section 9.2).
12.9 Central Heating Temperature Sensor
(Fig. 53)
1. Ease the retaining tab on the sensor away and
disconnect the electrical plug.
2. Unscrew the sensor from it's pocket and
reassemble in reverse order. The plug will only fit
one way.
12.10 Safety Thermostat
1. Pull the electrical connections off the
thermostat.
2. Remove the screws securing the thermostat to
the mounting plate on the flow pipe.
3. Reassemble in reverse order. The thermostat is
not polarised - either wire can fit either terminal on
the thermostat.
12.11 DHW Temperature Sensor
1. Turn off the mains water supply and draw off
the residual domestic hot water.
2. Ease the retaining tab on the sensor away and
disconnect the electrical plug.
3. Unscrew the sensor from the plate heat
exchanger manifold. Examine the sealing
washer,replacing if necessary.
4. Reassemble in reverse order. The plug will only
fit one way.
(Fig. 53)
(Fig. 53a)
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