Auto Air Vent; Plate Heat Exchanger - Baxi COMBI 224 Installation And Service Manual

Fig.59 Removing the auto air vent
Fig.60 Removing the plate heat exchanger
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10.4.3 Auto air vent

Warning
Take precautions to protect other components from water damage
when removing the air vent.
1. Close the flow and return isolation taps and drain the boiler primary
circuit.
2. Unscrew the automatic air vent anti-clockwise and lift away from the
pump body.
3. Fit the new air vent and O-ring seal.
4. Reassemble in reverse order.
PN-0000282

10.4.4 Plate heat exchanger

Note
It is recommended to isolate the cold water mains stop cock to the
dwelling.
1. Close the flow and return isolation taps and the cold mains inlet.
2. Drain the primary circuit and draw off any residual DHW.
3. Hinge the control box downwards.
4. Remove the air/gas unit.
See
To remove see section 10.3.7 Air/gas unit paragraph 1 to 6.
5. Undo the screws securing the plate heat exchanger to the hydraulic
assembly.
6. Withdraw the plate heat exchanger by manoeuvring it to the rear of
the boiler, then upwards and to the left to remove.
Seals
7. There are four rubber seals between the hydraulic assembly and
heat exchanger which may need replacement.
PN-0000240
8. Ease the seals out of the hydraulic assembly. Replace carefully, en­
suring that the each seal is inserted parallel and pushed fully in.
9. Reassemble in reverse order.
10 Maintenance
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