Potterton Performa 24i HE Installation And Service Instructions Manual page 38

Diverter Valve
Operating Head
3-pin Plug
Diaphragm
Spring
Spring Clip
Microswitch
Cartridge
Body
Filter Gauze
Fig. 71
Flow
Regulator
Venturi
38
Spring Clip
Diaphragm
Pushrod
Fig. 70
CH Pressure
Differential Valve
Cover
Inlet/Return Manifold
12.0 CHANGING COMPONENTS
12.22 Diverter Valve Assembly (Cont)
CH Pressure Differential Valve Diaphragm
(Fig. 70)
1. Isolate the boiler from the central heating flow and
return pipes and drain the boiler primary circuit.
Diverter Valve
2. Prise off the spring clip retaining the microswitch.
Pull the switch away.
3. Undo the screws securing the differential valve
cover.
4. Carefully draw off the cover and remove the
diaphragm.
5. Fit the new diaphragm and reassemble in reverse
order.
Diverter Valve Operating Head (Fig. 70)
1. Pull the 3-pin plug off the operating head and prise
off the spring clip retaining the head to the valve
body.
2. Lift the operating head away from the valve body.
3. Fit the new head and reassemble in reverse order.
12.23 Flow Regulator (Figs. 71 & 72)
1. Undo the filter cartridge from the inlet/return
manifold.
2. Unscrew the venturi and remove the flow
regulator.
3. Check the cleanliness of the filter gauze, rinsing
thoroughly in clean water as necessary. Fit the new
flow regulator and reassemble in reverse order.
Fig. 72
Publication No. 5111813