C&M BRITONY System II 100 Maintenance and service manual - page 6
5. Ignition Electrodes
Carry out steps 1 and 2 as above. Hinge
down electrical box by pressing retaining
tabs P on either side.
Remove wiring cover C. Disconnect leads
from spark generator. Loosen screws
securing the closure plate and remove.
Remove grommet from base of sealed
chamber. Remove screw securing elec-
trode bracket and lift clear easing spade
connectors through the grommet.
Reassemble in reverse order, twisted
together electrodes cable at least 10 times
to avoid electrical interference.
6. Burner Assembly
Carry out steps 1,2, disconnect electrodes
as mentionned in section 4 and 5. Remove
two screws securing burner assembly to the
back panel of the boiler. Lift right hand back
corner first. Reassemble in reverse order.
7. Gas Solenoids
Disconnect colour coded leads. Remove six
screws. The solenoids are attached to their
base plate. Lift clear taking care not to lose
the three plungers and springs.
Reassemble in reverse order replacing the
cork gasket.
8. Fan Assembly
Remove outer case and sealed chamber
front panel (See Steps 1 and 2). Disconnect
spade connectors noting positions. Remove
two screws securing the front of the fan
assembly and loosen screw on flue outlet.
Twist fan assembly anticlockwise to disen-
gage from flue outlet and lift clear.
Re-assemble in the reverse order ensuring
that the wiring is re-connected correctly and
the screw on the flue outlet tightened.
9. Flue Hood
Carry out steps 1 and 2 as above. Remove
fan assembly as in step 8. Remove the
three screws securing the angled top of the
hood to the chassis. Lift and remove taking
care not to snag the pressure switch cables.
Re-assemble in the reverse order ensuring
that the hood is located behind the combus-
tion chamber rear panel.
6
Before removing appliance case, isolate
the gas and electrical supplies. Isolate boil-
er from the system and drain before
removing any component in the water-
ways. Ensure that the appliance is cool.
1. Outer Case
Remove four screws in base of case and
lift free. When replacing, carefully locate on
lugs T on top edge of chassis.
2. Combustion Chamber
Unscrew four self tapping screws securing
the sealed chamber front panel and lift
over top corner locating lugs. Unscrew four
self tapping screws to release combustion
chamber front plate and lift clear.
Reassemble in reverse order.
3. Burner Manifold
Carry out steps 1 and 2 as above. Remove
two screws securing the closure plate and
the remaining four screws to release the
manifold. Lift clear. Replace the manifold
gasket. Reassemble in reverse order.
4. Ionisation Electrodes
Carry out steps 1 and 2 as above. Loosen
screws securing the closure plate and
remove. Disconnect the lead from the main
wiring loom. Remove screw securing elec-
trode to burner. Thread wire through grom-
met and lift clear. Reassemble in reverse
order.
10. Pressure Switch
Remove outer case and sealed chamber
front panel as in steps 1 and 2. Disconnect
three pressure switch cables noting their
positions.
1 = white cable connected to NC
2 = black cable connected to NO
P = orange cable connected to C
Remove screw securing the switch bracket
to the chassis. Disconnect the sampling
tubes again noting their positioning (+ and
-). Remove switch. Reassemble in reverse
order.
11. Pressure Switch Venturi
Carry out steps 1, 2 and 8, as above.
Disconnect the sampling tubes and
remove the screw securing the venturi to
the flue outlet. Remove venturi by the bot-
tom of the 45° elbow. Reassemble in
reverse order.
12. Drain down
2 drain points are located on the boiler.
H = Heating circuit drain point
13. Water filter
The C/H filter ensures a seal between the
connecting bracket and the pipe to the
flow switch. Drain the boiler as in step 12.
Unscrew the pipe nut and remove the clip
on the hydraulic assy. Pull the pipe toward
you and remove the water filter from its
location.
Reassemble in reverse order.
REMOVAL AND REPLACEMENT OF PARTS
(air separator)
1
2
P
T
T
1
2
H
A
A
T
A A
T
P
C
P