Technical data

53
4000123924-2
20 Replacement of Parts
9760
Diagram 20.16
AIR VENT
CAP
F30E shown
9781
Diagram 20.17
GAS CONTROL
VALVE
➜
➜
➜
➜
➜
9782
11591
F30E shown
10018
Diagram 20.18
STEPPER
MOTOR
➜
➜
➜
GAS CONTROL
VALVE
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.
Please ensure that the new"O" ring and clip are fitted.
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 pipes and union nuts at the gas
control valve.
• Disconnect supply pipe union nut at the burner injector bar.
• Remove the locking nut and brass washer 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.