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Remove the fixing brackets on the heat-
exchanger shown in figure 40
Figure 40
Remove the heat exchanger and burner by
pulling forward.
Fit the new heat exchanger and reassemble
the boiler in reverse order ensuring all
washers are fitted. (Replace any damaged
washers or seals as required)
30
Open the isolating valves on the flow and
return connections, refill, vent and re-
pressurise system ensuring that all joints
are sound.
Check the manual air-vent, and vent the air
from the heat exchanger by means of
screw on manual air-vent.
18.11 Gas valve
Ensure that gas supply to boiler is turned
off.
Disconnect the electrical connections to
the gas valve, and silicone tube.
Release
connection from the top of the gas valve
and manifold inlet.
the
main
gas
supply tube
Remove the gas valve's two securing screws
and washers from the bottom side of boiler.
Rotate the gas pipe and withdraw the gas valve
assembly, taking care not to loose the
restrictor in the top of the valve.
Remove the restrictor and fit into the new
valve.
Refit in reverse order of removal, replacing
both washers as required.
Check for gas tightness and correct boiler
operation.
Where necessary the gas valve settings may be
re-calibrated by the following method:
18.12 Zero adjustment setting
Insert a combustion analyser into the socket on
the flue adapter.
Remove the brass screw to access the
adjustment socket. (Figure 43)
Turn the boiler's function switch to the
'heating/hot water' position. (4 figure 17)
Turn the central heating temperature control to
maximum setting. (2 figure 17)
Turn Potentiometers P2 & P4 (figure 19)
anticlockwise to the minimum setting.
Page 30
solaris 24PC, 30PC
Figure 41
Figure 42
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