39
7.25.3
Close the on/off valves on the heating circuit
and drain at drain point water from the boiler
(Fig. 93).
7.25.4
Remove the wires that connect the pump (fig.
93).
7.25.5
Unscrew the two hexagonal nuts that fasten the
pump to its pipes and remove the pump.
NOTE:
It may be necessary to loosen the flow
pipe at the heat exchanger to replace the pump
gaskets.
7.25.6
Always use new seals when re-fitting the new
pump.
7.25.7
Replace in reverse order
IMPORTANT:
7.25.8
Make sure that the arrow that indicates the
direction of flow aims from the bottom
upwards
7.25.10
Refill the heating system as described in the
sect. 6.4 & 5 and check for leaks
7.26
TO REMOVE/REPLACE THE DIVERTER
VALVE (Fig. 89)
7.26.1
Remove the front panel from the outer casing,
lower the instrument panel (sect. 7.16 2 & 3).
Remove lower grating (sect. 5.4.2).
7.26.2
Close the on/off valves for the heating circuit
and the hot water circuit. Drain the boiler at
drain point (Fig. 93) and drain hot water from
the lowest hot water tap and drain point on
DHW inlet cock (Fig. 46).
7.26.4
Unscrew the five nuts that connect the diverter
valve and pull it out from boiler being careful
not to damage the wires.
7.26.5
Pull off circlip securing microswitches to divert-
er valve
7.26.6
If replacing microswitch assembly use a screw-
driver to prise off the protective cover of the
microswitches.
7.26.7
Detach the wires that are connected to this.
Remember that they must subsequently be
reconnected to the same terminals (Fig. 94).
7.26.8
Replace in reverse order. Always use new
seals.
7.26.9
Fill the boiler as described in (sect. 6.4 & 5)
and check for leaks.
7.27
TO REMOVE/REPLACE THE CENTRAL
HEATING AND/OR HOT WATER CONTROL
THERMISTOR
7.27.1
Remove the front panel from the outer-cas-
ing (sect. 7.3) and lower the instrument panel
(sect. 7.16.2).
7.27.2
Remove left/right side of casing (sect. 5.4).
7.27.3
Remove the wires that connect the thermistor
(Fig. 81).
7.27.4
Close the on/off valves for the heating circuit
and the hot water circuit. Drain the boiler at
drain point (Fig. 93) and drain hot water from
the lowest hot water tap and drain point on
DHW inlet cock (Fig. 46).
Содержание CSI85A
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