Glow-worm 30ci - Gas Control Valve and Stepper Motor Replacement

53
4000123923-2
11936
➜
➜
10018
Diagram 20.18
STEPPER
MOTOR
➜
➜
➜
GAS CONTROL
VALVE
20 Replacement of Parts
Diagram 20.16
Diagram 20.17
30ci shown
30ci shown
9810
AIR VENT
CAP
GAS CONTROL
VALVE
➜
➜
9842
20.26 Bypass valve, refer to diagram 16.1.
Before starting refer to the front of Section 20 Important
information.
• Remove the front panel, refer to Section 17.3.
• Lower the control panel, refer to Section 17.4.
Drain down the boiler, refer to relevant part of Section 20.1.
• Remove the igniter unit, refer to Section 20.33.
Pull out slotted metal clip, ease out bypass valve from bypass
valve housing.
20.27 Automatic air vent, refer to diagram 20.16.
Before starting refer to the front of Section 20 Important
information.
• Remove the front panel, refer to Section 17.3.
• Lower the control panel, refer to Section 17.4.
• Drain down the boiler only, refer to relevant part of
diagram 20.1.
• Unscrew to remove automatic air vent.
• After fitting replacement automatic air vent ensure the cap
is open.
20.28 Gas Control valve, refer to diagram 20.17.
Before starting refer to the front of Section 20 Important
information.
• Remove the front panel, refer to Section 17.3.
• Lower the control panel, refer to Section 17.4.
• 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.
• Fit gas valve resistor to replacement gas control valve.
• Withdraw gas control valve assembly.
• Fit replacement gas control valve.
If the step pressure requires adjusting, refer to Section 15
Changing Gas Type.
20.29 Gas control valve stepper motor, refer to diagram
20.18
Before starting refer to the front of Section 20 Important
information.
• Remove the front panel, refer to Section 17.3.
• Lower the control panel, refer to Section 17.4.
• Remove the gas control valve, refer to Section 20.28.
• Disconnect the electrical connection from stepper motor.
• Remove the two screws securing stepper motor to the gas
control valve.
• Fit replacement gas control valve stepper motor.
• Note: Take care not to damage the 'O' ring.