Replacement Of Parts - Saunier Duval Xeon 80ff Instructions For Use Installation And Servicing

10 Replacement of Parts

Note. Replacement of parts must only be carried out by a
competent person.
Before replacing any parts isolate the boiler from the electrical
supply and turn the gas supply off at the gas service cock,
indicator slot should be vertical.
Unless state otherwise, all parts are replaced in the reverse
order to removal.
After replacing any parts always test for gas soundness and if
necessary carryout functional check of controls.
10.1 Access
Gain access as Section 8.1.
10.2 Control Thermostat diagram 10.1
and 10.2
Remove and support the electrical control box, refer to Section
5.6.
Remove the control knob. Remove the electrical connections
from the thermostat body.
Release the thermostat body by unscrewing the two screws and
shakeproof washers in the front of the control box.
Remove the split pin and withdraw the thermostat phial from its
pocket. Release the capillary from the base and plastic retaining
clip then remove it from the split grommet. Release the capillary
from its clips. Remove the thermostat complete from the boiler.
Reassembly note. When fitting the thermostat, make sure that
the thermostat phial is covered with heat sink compound then
fully inserted into the phial pocket and that the capillary is within
the gland seal, see diagram 10.2. Remake the electrical
connections. There must be no kinks or sharp bends in the
capillary.
10.3 Over Heat Cutoff Device - diagram 10.1,
10.2 and 10.2A
Remove and support the electrical control box, refer to Section
5.6.
Remove the overheat cutoff electrical connections.
Disconnect the air pressure switch plug from the PCB.
Remove the locking nut from the overheat cutoff.
Release the capillary from the retaining clips then remove it
from the split grommet.
Remove the split pin and then the phial.
When refitting use the heat sink compound supplied.
10 Replacement of Parts
SHAKEPROOF
WASHERS AND
SCREWS
LOCKNUT
ELECTRICAL
CONNECTIONS
31
CONTROL
THERMOSTAT
CONTROL
KNOB
ELECTRICAL
CONNECTIONS
YELLOW 2 & 3
SPLIT
GROMMET
RETAINING
CLIP
Diagram 10.1
221972A