50
4000123942-2
18 Replacement of Parts
24ci only
24ci only Diagram 18.23
9870
➜
➜
➜
DOMESTIC HOT WATER
PLATE TO PLATE HEAT
EXCHANGER
Diagram 18.22
9845
IGNITION
UNIT
➜
➜
➜
Diagram 18.21
10017
THREE WAY
VALVE/ BYPASS
HOUSING
THREE WAY
VALVE
ACTUATOR
9785
9850
18.32 (24ci Only) Three-way valve actuator,
refer to diagram 18.21.
Before starting refer to the front of Section 18 Important
information.
• Remove the front panel, refer to Section 15.3.
• Lower the control panel, refer to Section 15.4.
• Drain down the boiler only, refer to relevant part of diagram
18.1.
• Remove the gas control valve, refer to Section 18.28.
• Remove 3-way valve head, refer to Section 18.31.
• Remove the three way valve actuator.
18.33 Ignition unit, refer to diagram 18.22.
Before starting refer to the front of Section 18 Important
information.
• Remove the front panel, refer to Section 15.3.
• Lower the control panel, refer to Section 15.4.
• For ease of access remove the left hand side panel, refer to
Section 15.6.
• Disconnect electrical connections.
• Remove ignition unit securing screw.
• Pull upwards to release and remove the ignition unit from the
retaining slot.
18.34 (24ci Only) Domestic hot water plate to
plate heat exchanger
Before starting refer to the front of Section 18 Important
information.
• Remove the front panel, refer to Section 15.3.
• Lower the control panel, refer to Section 15.4.
• Drain down the boiler and hotwater circuit ,refer to relevant
parts of diagram 18.1.
• Unclip the central heating thermistor.
• Unscrew the heating flow pipe union nut, swing pipe forwards.
• Remove the gas supply pipe between the gas control valve
and injector bar, see diagram 18.23.
• Disconnect the union connection from the expansion vessel.
• Supporting domestic hot water plate to plate heat exchanger,
unscrew and remove two screws securing it onto pump
mounting and 3-way valve/bypass housing.
• Remove plate to plate heat exchanger from boiler.
• Fit replacement plate to plate heat exchanger.
Note: Plate to plate heat exchanger mounting screws are offset
to ensure correct fitting.
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