Changing Components - Baxi System 100 HE Plus Installation & Servicing Instructions Manual

Heat Exchanger
Manifold
Drain Point
Fig. 45
Manual Air Vent
Tube
Automatic Air Vent
Sealing Washer
Fig. 46
13.0

Changing Components

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.
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).
WARNING: The PCB Control and Fan
Assembly is 325 Vdc. Isolate at supply
before access.
2. Isolate the water circuit and drain the boiler as
necessary. There are 3 drain points:
a) Flow Valve
b) Heat Exchanger Manifold (Fig. 45)
c) Return Valve
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 vents, flowswitch, thermistor, safety
thermostat and expansion vessel can be accessed after
removal of the outer case.
13.2 Manual and Automatic Air Vent (Fig. 46)
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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