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•
Remove the heat exchanger by pulling forward.
•
Fit the new heat exchanger and reassemble the boiler in reverse order ensuring all the
washers and seals are fi tted correctly. (Replace any damaged washers or seals)
•
Open the isolating valves on the fl ow and return connections, refi ll, vent and re-
pressurise the system ensuring that all joints are sound.
•
Check the manual air-vent, and vent the air from the heat exchanger by means of the
screw cap on top of the manual air-vent.
18.8 Gas Valve
•
Read the notes at the head of this section before
commencing any work on the appliance.
•
Disconnect the silicone tube and electrical connections
from the gas valve.
•
Undo the nut on top of the gas valve, fi gure 40, and release
the pipe from the fan assembly. (Be careful not to damage or
dislodge the restrictor located in the gas valve outlet)
•
Release the main gas connection below the gas valve.
•
Remove the gas valve's two securing screws and washers from the bottom side of
boiler. (Figure 41)
•
Rotate the gas pipe and withdraw gas valve assembly.
•
Carefully remove the restrictor from the top of the gas valve and insert it into the top of
the new valve.
•
Refi t in reverse order to removal replacing any seals and gaskets as required.
•
Check for gas tightness and correct boiler operation.
•
Where necessary the gas valve settings may be re-calibrated by the following method
in 18.9.
Figure 40
Figure 41
34
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