Glow-worm Xtramax - Manual (Page 36)

36 4000116705-2
20 Replacement of Parts
20.6 Domestic water flow 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 domestic hot water circuit of boiler only, see
diagram 20.1.
• Locate flow sensor on cold water inlet pipe to boiler inside
controls area, see diagram 20.6.
• Carefully pull off electrical connector from flow sensor.
• Pull out slotted metal clip securing cold water inlet pipe to flow
sensor and carefully remove from sensor.
• Pull out slotted metal clip securing flow sensor to pump
mounting and carefully remove sensor from boiler.
• Fit replacement sensor.
20.7 Printed circuit board (PCB)
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.
• Gain access to rear of control panel.
• Unclip side clips and hinge up control panel cover to gain
access to PCB, see diagram 13.2.
• Carefully pull off electrical connections to PCB.
• Unclip and lift out PCB.
• Fit replacement PCB, ensure that PCB connections are fully
pushed onto replacement PCB. Set the heating temperature
option to the same value as the old PCB, refer to relevant part
of Section 13 and diagram 13.3.
20.8 Central heating pump, refer to diagram
20.7.
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.
• For ease of access if required remove the left hand side panel,
refer to Section 17.6.
• Drain down central heating water circuit of the boiler only, see
diagram 20.1.
• Undo two fixing screws and remove pump retaining bracket
from front of pump.
• Undo two jubilee clips securing pump outlet hose connection
to pump.
• Slide clips upwards to give access to hose.
• Slide hose along pipe to clear pump outlet.
• Remove pump from pump block by lifting up at front and pulling
forward.
• Gain access to the pump electrical connection box and remove
cover.
• Disconnect pump cable from pump (avoid straining cables).
• Transfer automatic air vent to replacement pump.
• Re-connect electrical connection.
11764
11763
Diagram 20.7
Diagram 20.6
• Fit replacement pump.
• Open isolating valves on flow and return connections, refill,
and pressurise boiler.
• Check for leaks.
20.9 Hot water plate to plate heat exchanger
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 circuits of
boiler only, see diagram 20.1.
• Supporting domestic heat exchanger, unscrew and remove
two screws securing it onto pump mounting and 3-way valve/
bypass housing.
• Remove plate to plate heat exchanger from boiler.
• Fit replacement plate to plate heat exchanger.
Note: Plate to plate heat exchanger mounting screws are offset
to ensure correct fitting of replacement.