47
4000122704-1
10018
Diagram 20.18
STEPPER
MOTOR
➜
➜
➜
GAS CONTROL
VALVE
20 Replacement of Parts
20.26 Bypass valve, refer to diagram 20.15.
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.
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: The washers must be kept for use on reassembly.
• Withdraw gas control valve assembly.
• Fit replacement gas control valve.
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.
9760
Diagram 20.16
AIR VENT
CAP
9781
Diagram 20.17
GAS CONTROL
VALVE
➜
➜
➜
➜
➜
9782
9766
F30E shown
F30E shown
