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20 Replacement of Parts
20.30 Heating safety valve (3 bar RED), refer to
diagram 20.19.
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.
• Undo discharge pipe union nut.
• Pull out slotted metal clip from valve body and remove valve.
20.31 Three-way valve head, refer to diagram
20.20.
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.
• For ease of access remove the right hand side panel
, refer to
Section 17.6.
• Remove electrical plug from valve head.
• Pull out slotted metal clip from valve body and remove valve
head from body.
• Fit replacement valve head in reverse order to removal.
Note :
1)
When refitting clip, ensure that letters YES are as shown.
2)
It is not necessary to drain boiler to carry out this work.
20.32 Three-way valve actuator, refer to
diagram 20.21.
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
.
• Remove the gas control valve,
refer to Section 20.28.
• Remove 3-way valve head,
refer to Section 20.31.
• Remove the three way valve actuator
, see diagram 20.21.
20.33 Ignition unit, refer to diagram 20.22.
Before starting refer to the front of
Section 20 Important
information.
• For ease of access remove the left hand side panel
, refer to
Section 17.6.
• Disconnect electrical connections.
• Remove ignition unit securing screw.
• Pull upwards to release and remove the ignition unit from the
retaining slot.
10018
Diagram 20.18
STEPPER
MOTOR
➜
➜
➜
GAS CONTROL
VALVE
11585
Diagram 20.19
PRESSURE
RELIEF
VALVE
➜
➜
Diagram 20.20
9768
➜
➜
THREE WAY
VALVE HEAD
9769