Glow-worm Xtrafast 96-120 - Manual (Page 30)

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19 Replacement of Parts
9680
Diagram 19.5
19.5 Air pressure switch, refer to diagram 19.4
Before starting refer to the front of Section 19 Important
information.
• Remove the front panel, refer to Section 16.3.
• Lower the control panel, refer to Section 16.4.
• Remove the sealed chamber cover, refer to Section 16.5.
• Locate air pressure switch situated inside combustion chamber
on top right hand side.
• Remove air pressure switch tube.
• Disconnect air pressure switch electrical connections.
• Undo screws on top of boiler securing air pressure switch to
boiler and remove switch.
19.6 Domestic water flow sensor, refer to
diagram 19.5.
Before starting refer to the front of Section 19 Important
information.
• Remove the front panel, refer to Section 16.3.
• Lower the control panel, refer to Section 16.4.
• Drain down domestic hot water circuit of boiler only, refer to
relevant part of Section 16.13.
• Locate flow sensor on cold water inlet pipe to boiler inside
controls area.
• Carefully pull off electrical connector from flow sensor.
• Pull out slotted metal clip securing cold water inlet pipe to flow
sensor disconnect union nut securing cold water inlet pipe to
isolating valve and remove.
• Pull out slotted metal clip securing flow sensor to pump
mounting, remove sensor.
19.7 Printed circuit board (PCB), refer to
diagram 19.6
Before starting refer to the front of Section 19 Important
information.
• Remove the front panel, refer to Section 16.3.
• Lower the control panel, refer to Section 16.4.
• Gain access to rear of control panel.
• Unclip side clips and hinge up control panel cover to gain
access to PCB, see diagram 11.2.
• Carefully pull off electrical connections to PCB.
• Unclip and lift out PCB.
Note: Make sure that PCB connections are fully pushed onto
replacement PCB.
19.8 Central heating pump, refer to diagram
19.7.
Before starting refer to the front of Section 19 Important
information.
• Remove the front panel, refer to Section 16.3.
• Lower the control panel, refer to Section 16.4.
• Drain down central heating water circuit of the boiler only, as
follows:
• Close isolating valves (q) and (v) on central heating isolating
cocks (A) and (C) ,see diagram 7.1.
WATER
FLOW
SENSOR
Diagram 19.7
CENTRAL
HEATING
PUMP
9674
➜
➜
➜
➜
➜
➜
➜
9673
Diagram 19.4
AIR PRESSURE
SWITCH
➜
➜
➜
➜
Diagram 19.6
10037