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(c)
Drain the boiler.
(d) Loosen, but do not completely remove, the two
MS
screws at
the top of each side of the combustion chamber securing it to
the inner casing.
(e)
Release the union connections at the heat exchanger and
carefully manoeuvre the heat exchanger out of the inner
casing taking care not to mislay the fibre washers.
(f)
Remove and discard the insulation and fit the replacement
pads. Do not forget the pad fitted to the combustion chamber
front cover.
(g) Refit the heat exchanger ensuring that it is correctly
positioned. Do not forget the union washers.
NOTE.
Do not forget to remove the cloth from the burner and
pilot assembly.
(h) Refit the combustion chamber cover.
(i)
Tighten the combustion chamber fixing screws.
(j)
Reassemble the appliance in the reverse order checking that all
the components have been fitted correctly.
11.
THE PIEZO GENERATOR
Fig. 22.
(a) Carefully pull the lead off the connector tab at the piezo
generator
(b) Remove the two
MS
fixing screws and remove the piezo
generator
(c)
Fit a new generator and reassemble in the reverse order checking
that the overheat thermostat leads are not trapped by the
generator bracket.
12.
THE PRESSURE GAUGE
Fig. 30.
(a) Isolate the boiler and drain off the central heating and
domestic hot water systems.
(b) Unscrew the pressure gauge from the heat bank.
(c)
Fit a new pressure gauge.
(d) Open all the radiator valves and refill the system, venting as
necessary. The appliance is fitted with an automatic air vent on
the heat bank.
20
1 3. DOMESTIC HOT WATER PUMP
Fig. 30.
Check that the electrical supply has been disconnected.
(a) Turn off the isolating valves mounted on the inlet and outlet of
the pump.
(b) Undo the two union nuts and remove the pump. Discard the
sealing washers.
(c) Support the pump and remove the two screws holding the
electrical cover onto the pump and disconnect the electrical
leads. Note the wire positions.
(d) Fit the replacement circulating pump using new sealing
washers.
NOTE.
The direction flow indicator on the pump should point
upwards towards the top of the appliance. The replacement
pump should be set at maximum iffitteci with a speed adjuster.
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