Plate Heat Exchanger; Seals; Diverter Valve - Motor Unit & Assembly - Potterton Gold 24 HE Installation & Service Instructions Manual

Plate Heat Exchanger

LH Location Stud
Fig. 63
Rubber Seal
Motor Unit
Multi-pin
Plug
Valve
Assembly
Fig. 64
Securing Screw
40
Retaining Clip
Bypass Pipe
Spring Clip
Fig. 65
12.0 CHANGING COMPONENTS
12.19 Plate Heat Exchanger (Fig. 63)
1. Drain the primary circuit and remove the gas valve
as described in section 12.23.
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.
12.20 Diverter Valve - Motor Unit & Assembly
(Figs. 64 & 65)
1. To replace the motor unit, disconnect the multi-pin
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. Remove the spring clip retaining the bypass pipe to
the rear of the assembly and under the flow pipe nut at
the left hand side.
6. 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.
7. 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.
Publication No. 5116282