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13.0 Changing Components - Page 29
13.1
Changing Components
IMPORTANT: When changing components ensure that
both the gas and electrical supplies to the boiler are
isolated before any work is started.
When the boiler control knob is switched off the control
PCB remains live. Therefore it is important to isolate the
electrical supply.
Hazardous materials are not used in the construction of
Baxi products, however reasonable care during service
is recommended.
When replacing the combustion box door after changing
components it is essential that the retaining screws are
tightened fully.
1. Remove the outer case and lower door panel (see "Fitting
the Outercase" Section 11.0).
2. Isolate the water circuit and drain the system as
necessary. There are 3 drain points:
a)
Flow Valve
b)
Heat Exchanger Manifold
c)
Return Valve
NOTE: Do not use the Pressure Relief Valve to drain the
circuit.
NOTE: When reassembling always fit new 'O' rings,
ensuring their correct location on the spigot. Green 'O'
rings are used for gas joints and Black 'O' rings for
water joints. Use Greasil 4000 (Approved Silicone
Grease).
3. After changing a component re-commission the boiler
where appropriate and check the inhibitor concentration (see
Section 6.2 and 10.1).
The air vent, flowswitch, thermistor, safety thermostat
and expansion vessel can be accessed after removal of
the outer case.
13.2
Automatic Air Vent (Fig. 45)
1. Drain the boiler.
2. Undo the air vent from the return pipe and retain the
sealing washer.
3. Remove the air vent.
4. Fit the new air vent and reassemble in reverse order.
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