SECURING
SCREW
FAN HOOD
FAN
ELECTRICAL
CONNECTIONS
EARTH
LEAD
PRESSURE SWITCH
CONNECTION TUBE
PRESSURE SWITCH
CONNECTION TUBE
18.7 Disconnect the electrical leads and air pressure
switch connection tube from the fan, remove the fan
screws and withdraw fan from fan hood with its 56º
bend.
(Figure 29)
18.8 Remove the burner assembly from the
combustion chamber as follows:
Pull off the ignition and flame electrode leads
from the PCB and remove the wires with grommet
from the combustion chamber base.
(Figure 30)
Remove the burner-retaining screws at the sides
and remove the burner.
18.9 Visually check for debris/damage and clean/replace
as necessary the following items:
⇒
Heat exchanger
⇒
Burner
⇒
Fan/compartment
⇒
Electrodes
⇒
Insulation/gaskets
18.10 To clean the condensate trap, which is located at
the back left hand corner of the appliance, remove the
plastic hose from the outlet and insert a suitable allen
key into the outlet and remove the sump by turning anti-
clockwise. Clean the sump using a dilute solution of
bleach. Apply a little silicone grease to the O ring and
replace the sump so that the O ring is just engaged. Do
not over tighten.
18.11 The boiler is fitted with a cold water inlet filter
which must be inspected on each service. To access the
filter:
Close the isolating valve on the boiler's cold water
domestic inlet by turning the valve head fully
clockwise.
Figure 31
Note. All washers/gaskets must be retained for use on
re-assembly, replace if damaged.
Important.
Clean the heat exchanger using a soft brush or
vacuum cleaner. Do not use any tool likely to
damage painted finish of heat exchanger.
Clean the burner by washing in soapy water.
Allow to dry thoroughly before re-fitting.
Do not use wire or a sharp instrument to clean
the burner injectors.
Ensure the ignition electrode gap is set to 4 mm.
Figure 29
Figure 30
Page 23
SENSING TUBE
GROMMET
BURNER
SPARK GAP 4mm
SECURING SCREW
LEFT HAND SIDE
OF BURNER
RIGHT HAND
SIDE OF BURNER
FLAME AND IGNITION
ELECTRODE LEADS
HALL
EFFECT
SENSOR
23