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12.0 Changing Components
39
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.
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. 70
Cartridge
Body
Filter Gauze
Flow
Regulator
Venturi
Inlet/Return Manifold
Fig. 71
Fig. 72
Diverter Valve
Microswitch
Diverter Valve
Operating Head
3-pin Plug
Pushrod
Diaphragm
Spring
Diaphragm
Spring Clip
CH Pressure
Differential Valve
Cover
Spring Clip