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2000225024C
10 Replacement of Parts
Diagram 10.1
9595
IGNITION
LEAD
PILOT PIPE NUT
FLUE
BLOCKAGE
SAFETY
DEVICE
SECURING
SCREW (2)
IMPORTANT. When replacing the heat exchanger please
remember that it exceeds the recommended weight for a one
man lift, refer the Manual Handling Operations, 1992 Regulations
for further information.
Notes.
a) Replacement of parts must be carried out by a
competent person.
b) Unless stated otherwise all parts are replaced in the
reverse order to that of removal.
c) After replacing any gas carrying parts always test for
gas soundness using a suitable leak detection fluid.
Also carryout functional check of controls.
d) Refer to the Gas Fire Installation Instructions for
details of the removal of the fire front.
e) Isolate the electrical supply to the back boiler.
f) Refer to diagram 6.1 to identify the back boiler
controls.
Turn the control thermistor to "reset" position, see diagram 6.1.
Turn the appliance gas service cock anticlockwise to “0”, “Off”
position, see diagram 6.2.
10.1 Sensing Tube Assembly.
Refer to Section 8.2.
10.2 Flue Blockage Safety Device
Follow the instructions in Section 8.2 and 8.4 to remove the
sensing tube assembly and controls assembly and burner.
Refer to diagram 10.1.
Remove the ignition lead from the electrode.
Disconnect the sensing lead.
Disconnect the pilot pipe nut.
Remove the safety device securing screws.
Remove the safety device.
10.3 Electrode
Proceed as in Section 10.2.
10.4 Ignition Lead and Sensing Lead
Remove the control box lid, see diagram 10.3.
Remove the lead from the electrode or sensor, see diagram
10.4.
Remove the lead from the control board (PCB).
When replacing make sure the lead passes through the slot in
the rear of the control box and the protective silicone sleeve is
replaced.
10.5 Injector - Main Burner
Follow the instructions in Section 8.5 to remove the burner.
Replace the main injector, see diagram 8.5.
Diagram 10.2
SECURING
SCREWS (4)
SECURING
SCREWS (4)
9604
GAS
CONTROL
VALVE
PILOT TUBE
NUT
ELECTRICAL PLUG
SENSING
LEAD
Diagram 10.3
9602
SECURING
SCREW
CONTROL
BOX
COVER
CONTROL
BOX
SECURING
SCREW
CONTROL
BOX LID
Summary of Contents for BBU 45/4
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