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Pressure Differential
Microswitch / Bracket
Diaphragm
Heating
Flow Pipe
Diverter Manifold
Fig. 69
36
Sensing Pipe
Spring Clip
Pressure Gauge
Capillary
12.0 Changing Components
12.22
Diverter Valve Assembly (Cont)
Pressure Differential Valve (Fig. 69)
1. Remove the DHW Flow Sensor as described
above.
2. From the brass diverter manifold undo the nut
on the heating flow valve. Remove the screw
securing the diverter manifold to the appliance
lower bracket.
3. Disconnect the pressure gauge capillary from
the diverter manifold and remove the two wires
from the Pressure Differential microswitch.
4. Prise off the spring clip securing the by-pass
pipe to the diverter manifold and disconnect the
sensing pipe.
5. Ease the diverter manifold out of the plate
heat exchanger manifold. Remove the assembly
from the appliance.
6. Undo the screw securing the microswitch
bracket to the sensor. The sensor may now be
dismantled to examine the diaphragm.
By-pass
Pipe
7. To examine the diaphragm hold the sensor
securely and carefully remove the four screws.
The diaphragm spring will force apart the two
halves of the sensor.
8. Carefully examine the diaphragm and replace
it if there is any damage.
9. Reassemble in reverse order.
Central Heating Pressure Microswitch
(Fig. 69)
1. Remove the two wires from the central
heating pressure microswitch.
2. Undo the screw securing the microswitch
bracket to the sensor.
3. Reassemble in reverse order.
12.23
Flow Regulator
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.
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