Glow-worm Xtrafast 96-120 - Manual (Page 31)

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19 Replacement of Parts
Note: These valves are closed when slots are at right angles to
direction of flow.
• Drain boiler by opening drain valves (r) and (u), see diagram
7.1.
Note: it is not necessary to drain down the entire heating system
to carry out this work.
• For ease of access if required remove the left hand side panel,
refer to Section 16.6.
• Undo two fixing screws and remove pump retaining bracket
from front of pump.
• Pull out slotted metal clip securing pump outlet hose connection
to pump.
• 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.
• Open isolating valves on flow and return connections, refill,
and pressurise boiler.
• Check for leaks.
19.9 Hot water plate to plate heat exchanger,
refer to diagram 19.8.
Before starting refer to the front of Section 19 Important
information.
• Remove the front panel, refer to Section 16.3.
• Lower the control panel, refer to Section 16.4.
• Drain down central heating and domestic hot water circuits of
boiler only ,refer to relevant parts of Sections 16.13 and 19.8.
• To gain access to the left hand securing screw. Disconnect the
domestic water flow sensor at the plate to plate heat exchanger
and cold water inlet. Remove the domestic hot water flow
sensor, refer to Section 19.6.
• 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 using new seals,
supplied.
Note: Plate to plate heat exchanger mounting screws are offset
to ensure correct fitting of replacement.
Diagram 19.9
9677
THREE WAY
VALVE
➜
9682
Diagram 19.8
PLATE TO PLATE
HEAT EXCHANGER
➜
➜
PIPE
CONNECTION
Diagram 19.10
9956
➜
➜
➜
➜
➜
➜
➜
9955
9785
THREE WAY
VALVE/BYPASS
HOUSING
THREE WAY VALVE
ACTUATOR