Installation and maintenance instructions ecoTEC plus 937 0020031552_06
67
Release both fixing screws (
5
) on the gas valve and
remove the fan from the gas valve.
Replace the faulty component.
b
Caution!
Possible material damage caused by
improper installation.
The gas valve and the fan may be damaged
as a result of incorrect installation.
Fit the gas valve and the fan in the same
position as before.
Screw the fan onto the gas valve.
Use new seals.
Re-install the complete "gas valve/fan" unit in
reverse sequence.
After completion of the work check the system for
gas leaks and carry out a function test (see Section
8.8).
10.4
Replacing the expansion vessel
a
Danger!
Risk of personal injury and/or material
damage as a result of non-compliance with
the safety instructions.
Before replacing the component, comply
with the safety instructions in Chapter 10.1.
Disconnect the appliance from the mains as described
in Chapter 10.1, and close the gas isolator valve in the
gas supply pipe.
Close the stop valves in the flow and return pipes and
drain the water out of the combi boiler.
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1
2
3
4
Fig. 10.4 Replacing the expansion vessel
Unscrew the nuts (
4
) from the water pipe on the
underside of the expansion vessel.
Unscrew the two screws (
1
) in the retaining plate (
2
)
and remove the retaining plate.
Pull out the expansion tank (
3
) forwards.
Guide the new expansion tank back into the appli-
ance.
Re-connect the new expansion tank using a new gas-
ket.
Re-fit the retaining plate.
Check the pressure of the expansion tank (minimum
pressure 0.75 bar).
If required, match the pressure to the static head of
the heating system.
Fill and bleed the combi boiler.
After completion of the work check the system for
gas leaks and carry out a function test (see Section
8.8).
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Replacing components 10
Summary of Contents for ecoTEC plus 937
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Page 74: ...74 Installation and maintenance instructions ecoTEC plus 937 0020031552_06...
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