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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 pipes and union nuts at the gas control
valve.
• Disconnect supply pipe union nut at the burner injector bar.
• Remove gas control valve retaining clip from the underside of
gas control valve.
• 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:
The washers must be kept for use on reassembly.
• 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.
➜
➜
9758
Diagram 20.15
SYSTEM WATER PRESSURE
SENSOR
BYPASS VALVE
9760
AIR VENT
CAP
9781
Diagram 20.17
GAS CONTROL
VALVE
➜
➜
➜
➜
➜
9782
11591
Diagram 20.16