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20 Replacement of Parts
20.34 Domestic 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 17.4.
• Drain down the boiler and hot water circuit ,
refer to relevant
parts of diagram 20.1
.
• Remove the water flow sensor
, refer to Section 20.24.
• Unclip the central heating thermistor.
• Unscrew the heating flow pipe union nut, swing pipe forwards.
• Remove the system water pressure sensor
, refer to Section
20.25.
• Supporting domestic hot water plate to plate 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 in reverse order
to removal using new seals, supplied.
Note
: Plate to plate heat exchanger mounting screws are offset
to ensure correct fitting.
20.35 Domestic safety valve (10 bar BLUE),
refer to diagram 20.24.
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 hot water circuit only ,
refer to relevant parts
of diagram 20.1
.
• Undo discharge pipe union nut.
• Pull out slotted metal clip from valve body and remove valve.
Diagram 20.24
DOMESTIC SAFETY
VALVE (10 BAR BLUE)
11398
➜
➜
DISCHARGE PIPE
11925
Diagram 20.22
9767
IGNITION
UNIT
➜ ➜
➜
➜
Diagram 20.21
10017 THREE WAY
VALVE/ BYPASS
HOUSING
➜
THREE WAY
VALVE
ACTUATOR
9785
Diagram 20.23
11596
➜
➜
➜
➜
DOMESTIC HOT WATER
PLATE TO PLATE HEAT
EXCHANGER
11597
