Removal And Replacement - Chaffoteaux & Maury Britony combi 80 Maintenance And Service Manual

REMOVAL AND REPLACEMENT OF PARTS
1
efore removing appliance case, isolate 5. Ignition Electrodes
e gas and electrical supplies. Isolate boi- Carry out steps 1 and 2 as above. Hinge
r from the system and drain before remo- down electrical box by pressing retaining
ng any component in the waterways. tabs P on either side.
nsure that the appliance is cool.
Remove wiring cover C. Disconnect leads
front panel as in steps 1 and 2. Disconnec
three pressure switch cables noting the1
positions.
1 = white cable connected to NC
2 = black cable connected to NO
Outer Case
and
C
t free. When replacing, carefully locate on
gs (B) on top edge of chassis.
Combustion Chamber
iscrew four self tapping screws securing
s sealed chamber front panel and lift
er top corner locating lugs. Unscrew four
If tapping screws to release combustion
iamber front plate and lift clear.
?assemble in reverse order.
Burner Manifold
lrry out steps 1 and 2 as above. Remove
o screws securing the closure plate and
? remaining four screws to release the
mifold. Lift clear. Replace the manifold
sket. Reassemble in reverse order.
Ionisation Electrodes
trry out steps 1 and 2 as above. Loosen
rews securing the closure plate and
nove. Disconnect the lead from the main
ring loom. Remove screw securing elec-
Ide to burner. Thread wire through grom-
9 and lift clear. Reassemble in reverse
der.
from spark generator. Loosen screws secu-
ring the closure plate and remove. Remove
grommet from base of sealed chamber.
Remove screw securing electrode bracket
and lift clear easing spade connectors
through the grommet. Reassemble in rever-
se order, twisted together electrodes cable
at least IO times to avoid electrical interfe-
rence.
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.
10. Pressure Switch
Remove outer case and sealed chamber
P = orange cable connected to C
Remove screw securing the switch bracks
to the chassis. Disconnect the samplin!
tubes again noting their positioning (+ an
-). Remove switch. Reassemble in revers
order.
11. Pressure Switch Venturi
Carry out steps 1, 2 and 8, as above
Disconnect the sampling tubes and rema
ve the screw securing the venturi to thl
flue outlet. Remove venturi by the botton
of the 45" elbow. Reassemble in revels
order.
12. Drain down
5 drain points are located on the boiler
(air sebarator)
1 = DHW circuit drain point
2 = Heating circuit drain point
13. Water filters ( DHW and Heating)
The DHW filter ensures a seal between the
connecting bracket and the pipe to the
DHW flow switch. Drain the boiler as ir
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.
The C/H filter is located in the right hydrau
lit assembly. Remove the return pipe a:
described previously and withdraw the fit
ter. Reassemble in reverse order.