Glow-worm 23c - Manual (Page 41)

41 2000225000B
18 Replacement of Parts
18.27 Automatic air vent, refer to diagram
18.18.
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
18.19.
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 gas control valve retaining clip from the underside of
gas control valve.
• Ease gas control valve forwards and disconnect electrical
connections to gas control valve.
Note: The washers must be kept for use on reassembly.
• Withdraw gas control valve assembly.
• After fitting replacement gas control valve test for gas
soundness.
18.29 Gas control valve stepper motor
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 the electrical connection from stepper motor, see
diagram 18.19.
• Remove the two screws securing stepper motor to the gas
control valve, see diagram 18.20.
• Fit replacement gas control valve stepper motor.
• Note: Take care not to damage the 'O' ring.
18.30 Discharge safety valve, 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.
• Undo discharge pipe union nut.
• Pull out slotted metal clip from valve body and remove valve.
9973
Diagram 18.18
9781
Diagram 18.19
GAS
CONTROL
VALVE
➜
➜
➜
➜
➜
10011
10010
AUTOMATIC
AIR VENT
10029
Diagram 18.20
STEPPER
MOTOR
➜
➜
GAS
CONTROL
VALVE
STEPPER
MOTOR
ELECTRICAL
CONNECTION