Glow-worm Xtramax - Manual (Page 37)

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20 Replacement of Parts
20.10 Three-way valve head
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 3- way valve in centre of lower controls area.
• Remove electrical plug from valve head.
• Pull out slotted metal clip from valve body and remove valve
head from body.
• Fit replacement valve head.
Note :
1) When refitting clip, ensure that letters OK are as shown, see
diagram 20.8.
2) It is not necessary to drain boiler to carry out this work.
20.11 Three-way valve/bypass housing
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.
• Drain down central heating and domestic hot water circuit of
boiler only, see diagram 20.1.
Note: It is not necessary to drain down entire heating system to
carry out this work.
• Remove 3-way valve head, refer to Section 20.10.
• Remove domestic hot water plate to plate heat exchanger,
refer to Section 20.9.
• Undo pipe connection from 3-way valve/bypass housing to
primary heat exchanger, see diagram 20.9.
• Pull out slotted metal clips and remove bypass pipe.
• Pull out slotted metal clip and remove domestic pipe from 3-
way valve/bypass housing to storage vessel.
• Remove central heating flow pipe from 3-way valve/bypass
housing to fixing jig.
• From underneath boiler, undo two screws securing 3-way
valve/bypass housing and lift out of boiler.
• Fit replacement 3-way valve/bypass housing.
20.12 Bypass
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.
• Drain down central heating water circuit of the boiler only, see
diagram 20.1.
Note: it is not necessary to drain down the entire heating system
to carry out this work.
• Pull out slotted metal clips and remove bypass pipe.
• Pull out slotted metal clip securing bypass into bypass housing,
remove bypass.
• Fit replacement bypass.
Diagram 20.8
➜
Pho483
Diagram 20.10
11765
Diagram 20.9
9349
PIPE CONNECTION
20.13 System water pressure sensor
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.
• Drain down central heating water circuit of the boiler only, see
diagram 20.1.
• Locate system pressure sensor at front left hand side of boiler,
see diagram 20.10.
• Remove electrical connections from sensor.
• Pull off slotted metal clip and remove sensor from boiler.
• Fit replacement sensor.