Glow-worm Xtramax - Manual (Page 38)

38 4000116705-2
20 Replacement of Parts
20.14 Gas control valve stepper motor, refer to
diagram 20.11.
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 17.5.
• Locate gas valve stepper motor attached to front of gas valve.
• Disconnect multi-plug from stepper motor.
• Remove screws securing stepper motor onto gas valve body.
• Withdraw stepper motor from gas valve body.
• Fit replacement stepper motor taking care not to damage the
'O' ring.
20.15 Gas Control valve assembly, refer to
diagram 20.11.
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 17.5.
• Disconnect multi-plug from stepper motor.
• Disconnect electrical connections from spark ignition unit
above gas valve assembly.
• Disconnect electrical connection from R/H side of gas control
valve assembly mounting bracket.
• Undo main gas supply nut from main burner, see diagram
17.3.
Note: The washer must be kept for use on reassembly.
• Undo main gas union nut between gas control valve supply
pipe and gas inlet valve.
Note: The washer must be kept for use on reassembly.
• Unscrew and remove screws securing gas control valve
mounting bracket to boiler frame.
• Withdraw gas control valve assembly, pipes and bracket,
taking care not to strain the electrical connection at the rear of
the gas control valve.
• While supporting the gas control valve assembly disconnect
the electrical connection at the rear of the gas control valve, see
diagram 20.11.
• Using the old gas control valve as a guide, transfer gas pipes
and bracket from old gas control valve to replacement gas
control valve.
• Fit replacement gas control valve assembly into boiler.
Diagram 20.11
➜
➜
11766
REAR OF GAS
CONTROL VALVE
ASSEMBLY
11767
➜
GAS CONTROL
VALVE STEPPER
MOTOR
SPARK IGNITION UNIT
➜
➜
➜
➜