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18 Replacement of Parts
18.25 System water pressure sensor, refer to
diagram 18.15.
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,
refer to relevant part of Section 18.1
.
• Remove electrical connections from water pressure sensor.
• Pull off slotted metal clip and remove water pressure sensor.
Please ensure that the new "O" ring and clip supplied are fitted.
18.26 Bypass valve, refer to diagram 14.1.
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,
refer to relevant part of Section 18.1
.
• Remove the ignition unit,
refer to Section 18.33.
Pull out slotted metal clip, ease out bypass valve from bypass
valve housing.
18.27 Automatic air vent, refer to diagram
18.16.
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
18.17.
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 pipes 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.
• Withdraw gas control valve assembly.
Note:
Use the new washers supplied with the gas control valve.
• Fit gas valve restrictor to replacement gas control value.
• Fit replacement gas control valve.
Check the Min. gas pressure and if it requires adjusting, refer
to Section 13 Changing Gas Type.
11585
Diagram 18.19
PRESSURE
RELIEF
VALVE
➜
➜
10018
Diagram 18.18
STEPPER
MOTOR
➜
➜
➜
GAS CONTROL
VALVE
F24E shown
9781
Diagram 18.17
GAS CONTROL
VALVE
➜
➜
➜
➜
9782
11591
F24E shown