Heatline CaprizPlus 28 - 19.4 Hydraulic Block (continued); 19.4.1 Pump (Head Only); 19.4.7 3 Way Valve Motor and Diverter Valve

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19.4.1 Pump (head only)
• Drain the boiler heating circuit as described in the appropriate
chapter "Draining".
• Disconnect the electrical plug (22) from the main board.
• Remove the four cap head screws (20).
• Carefully remove the pump head (21) together with cable.
Do not strain cable.
• Reconnect wiring to new pump head and  t cover.
• Fit the new pump head by repeating the operations in
reverse.
19.4.2 Automatic air vent
• Drain the boiler heating circuit as described in the appropriate
chapter "Draining".
• Remove the retaining clip (19).
• Remove the automatic air vent (17).
• Fit the new automatic air vent and ‘O’ ring ensuring the vent
cap is left loose.
• Re ll, vent and pressurise the boiler.
19.4.3 Low water pressure sensor
• Drain the boiler heating circuit as described in the appropriate
chapter "Draining".
• Disconnect the electrical lead (4).
• Remove the retaining clip (6), remove the low water pressure
sensor (5).
• Fit the new low water pressure sensor.
• Re ll vent and pressurise the boiler.
19.4.4 Safety discharge valve
• Drain the boiler heating circuit as described in the appropriate
chapter "Draining".
• Remove the low water pressure sensor as described in the
previous section.
• Undo the safety discharge valve union and remove the pipe.
• Disconnect the Central Heating isolation valve.
• Remove the securing clips and withdraw the safety discharge
valve plastic housing (29).
• Remove the safety discharge valve.
• Fit new ‘O’ ring. Re ll, vent and pressurise the boiler.
19.4.5 Flow sensor and impeller
• Remove the the electrical connection (12).
• Unclip the  ow sensor (13).
• Unscrew the impeller housing (28) and remove the impeller.
19.4.6 Bypass
• Drain the boiler heating circuit as described in the appropriate
chapter "Draining".
• Remove the bypass valve retaining nut (26) to remove the
bypass from its housing (25).
• After replacing the bypass, re ll, vent and pressurise the
boiler.
19.4.7 3 way valve motor and diverter valve
• Drain the boiler heating circuit as described in the appropriate
chapter "Draining".
• Disconnect the electrical plug (2).
• Remove the retaining clip (3).
• Remove the three way valve motor (1).
• Remove the diverter valve retaining nut.
• Remove the diverter valve.
• Fit new three way valve motor and diverter valve assembly.
• Re ll, vent and pressurise the boiler.
19.4.8 Plate-to-plate heat exchanger
• Drain the boiler heating and domestic hot water circuits as
described in the appropriate chapter "Draining".
• Remove the two securing screws (23).
• Remove the plate-to-plate heat exchanger (16).
• When replacing the plate-to-plate heat exchanger, ensure that
the four rubber sealing washers are  tted into the hydroblock.
NOTE: The plate-to-plate heat exchanger only  ts one way.
• Re ll, vent and pressurise the boiler.