Glow-worm 18si - Page 48

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18 Replacement of Parts
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Diagram 18.15
SYSTEM
WATER
PRESSURE
SENSOR
9810
Diagram 18.16
9833
AIR VENT
CAP
Diagram 18.17
GAS CONTROL
VALVE
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➜
9842
24ci shown
24ci shown
11936
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18.25 System water pressure sensor, refer to
diagram 18.15.
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, refer to relevant part of Section 18.1.
• Remove electrical connections from water pressure sensor.
• Pull off slotted metal clip and remove water pressure sensor.
18.26 Bypass valve, refer to diagram 14.1.
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, refer to relevant part of Section 18.1.
• Remove the ignition unit, refer to Section 18.33.
Pull out slotted metal clip, ease out bypass valve from bypass
valve housing.
18.27 Automatic air vent, refer to diagram
18.16.
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.
• Unscrew to remove automatic air vent.
• After fitting replacement automatic air vent ensure the cap is
open.
18.28 Gas Control valve, refer to diagram
18.17.
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.
• Disconnect gas supply pipe union nuts at the gas control
valve.
• Disconnect injector supply pipe union nut at the gas control
valve. Slacken the union nut at the burner injector bar.
• Remove the wire restraining clip from underside of gas
control valve
• Ease gas control valve forwards and disconnect electrical
connections to gas control valve.
Note: Use the new washers supplied with the gas control valve.
• Withdraw gas control valve assembly.
• Fit gas restrictor to replacement gas control value.
• Fit replacement gas control valve.
If the step pressure requires adjusting, refer to Section 13
Changing Gas Type.