Glow-worm 23c - Manual (Page 35)

35 2000225000B
9646
Diagram 18.3
SENSING
TUBE
AIR
PRESSURE
SWITCH
18.2 Fan, refer to ‘Section 15.10 Routine
Cleaning and Inspection’.
18.3 Air pressure switch
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.
• Remove the sealed chamber cover, refer to Section 15.5.
• Locate air pressure switch situated inside combustion chamber
on top left hand side, see diagram 18.3.
• Remove air pressure switch tube from sensing probe on fan.
• Disconnect air pressure switch electrical connections.
• Unclip to remove air pressure switch.
18.4 Domestic water inlet filter
Before starting refer to the front of Section 18 Important
information.
If the water flow rate through the appliance has reduced it may
be necessary to clean or replace the water inlet filter, refer to
section 15.12.
18.5 Central Heating Filter
Before starting refer to the front of Section 18 Important
information.
It may be necessary to clean or replace the central heating filter,
refer to section 15.13.
18.6 Cold water inlet restrictor
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 domestic hot water circuit of boiler only, refer to
relevant part of diagram 18.1.
• Remove the retaining wire.
• Undo union nuts from boiler cold water in isolating valve.
• Clean and inspect restrictor, replace if necessary, see diagram
18.4.
18.7 Burner, refer to Section 15.9.
Before starting refer to the front of Section 18 Important
information.
18.8 Burner injectors, refer to diagram 18.5.
Before starting refer to the front of Section 18 Important
information.
• Remove burner from boiler, refer to Section 15.9.
• Remove and replace injectors as required.
Note: The injectors may be cleaned, remove injectors inspect
and clean. Do not use a wire or sharp instrument.
Note: Make sure that injector size, marked on each injector, is
the same as that given in ‘Section 1 Technical Data’ for the
type of gas being used.
18 Replacement of Parts
ELECTRICAL
CONNECTORS
RETAINING
CLIPS
Diagram 18.5
BURNER
INJECTOR BAR
9990
Diagram 18.4
COLD WATER IN
ISOLATING VALVE
RETAINING
WIRE
UNION
NUTS
9777
10033
FLOW
RESTRICTOR