Baxi 47 075 35 Installation & Servicing Instructions Manual page 64

Fig. 84 and Fig. 85
page 45
14.19 Plate Heat Exchanger (Fig. 86)
1. Drain the primary circuit and remove the gas valve as described in section 14.23.
2. While supporting the heat exchanger undo the screws securing it to the brass manifolds.
3. Withdraw the heat exchanger upwards, taking care not to damage any wires or controls.
Seals
4. There are four rubber seals between the manifolds and heat exchanger which may need replacement.
5. Ease the seals out of the manifold. Replace carefully, ensuring that when the seal is inserted into the manifold it is parallel and
pushed fully in.
6. When fitting the new heat exchanger note that the left hand location stud is offset towards the centre more than the right hand one.
7. Reassemble in reverse order.
14.20 Diverter Valve ­ Motor Unit & Assembly (Fig. 87)
1. To replace the motor unit, disconnect the multi­pin plug.
2. Pull off the retaining clip and remove the motor unit.
3. The motor unit can now be replaced, or the valve assembly removed.
4. Drain the primary circuit and draw off any hot water once the isolating taps are closed.
5. Undo the nuts on the tap rail under the boiler. Remove the screws securing the valve assembly to the boiler bottom panel and plate
heat exchanger.
6. Remove the valve assembly. Examine any seals or washers, replacing if necessary. Transfer the DHW NTC to the new valve and
reassemble in reverse order.