36
18.10 Expansion Vessel
•
Read the notes at the head of this section before commencing any work
on the appliance.
•
Disconnect the pipe coupling on the expansion vessel (
fi
gure 43).
•
Lift the pressure vessel out of boiler from the gap over the chassis and
fi
t
the replacement vessel to the boiler in reverse order of removal ensuring the sealing
washer is
fi
tted to the pipe connection before
tightening.
(Replace the washer if required)
•
Using a pressure sensor, check that
the expansion vessel charge pressure is
0·5bar (7·5psi)
•
Open the isolating valves on the
fl
ow
and return connections, re
fi
ll, vent and
pressurise the boiler ensuring all joints are
sound.
Figure 43
Figure 44
18.11 Overheat Safety Thermostat
•
Read the notes at the head of this section
before commencing any work on the appliance.
•
Locate the overheat safety thermostat upstream of the three way valve (see
fi
gure 1).
•
Disconnect the electrical connections from the thermostat.
•
Remove the thermostat from the pipe being careful not to damage the retaining clip.
•
Fit the replacement thermostat in reverse order to removal.
18.12 Pressure Sensor
•
Read the notes at the head of this section before commencing
any work on the appliance.
•
Disconnect and remove the sensor cable and sensor from
the hydroblock. (
fi
gure 45)
•
Fit the replacement pressure sensor in reverse order ensuring
the gasket is correctly
fi
tted. (Replace the gasket if damaged)
Figure 45
Summary of Contents for SARGON 18S
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