Pump Head Replacement - Keston HEAT 2 45 Installation & Servicing

3.19 PUMP HEAD REPLACEMENT

1. Refer to Section 2.32.
2. Remove the front panel. Refer to Section 3.2.
3. Isolate water at the flow & return shut-off valves
beneath boiler.
4. Drain the water from the boiler via the drain
cock adjacent to the shut-off valve.
5. Remove the RHS casing panel to allow access.
Refer to Section 3.2.
6. Remove condensate assembly (elbow, union,
preformed hose).
7. Drop down the control panel door.
8. Disconnect the pump power supply at the left
hand terminal plug.
9. Withdraw the power supply cable through the
grommet.
10. Remove the four M5 Allen bolts securing the
pump head to body. (A high torque is required
to release these bolts, a long 4mm 'T bar' Allen
key is required).
11. Withdraw the pump head from the body.
12. Remove the PWM cable plug from the pump
head.
13. Remove the pump head through the bulkhead
aperture. Removal of side panel will allow
pump head to be rotated through the space
between the bulkhead and the sump.
Care should be taken to avoid water spillage
onto the PCB connections when withdrawing
the pump head through the aperture. There is
a plug situated in the boiler casing floor directly
beneath the pump to allow drainage of any
spillage within the casing.
13. Fit replacement pump head.
14. Reconnect all connections in reverse order,
ensuring all sealing grommets are correctly
located. Refer to Section 2.32.
15. Re-fit side panel ensuring corner grommet is
located correctly. Re-fit front panel.
Installation & Servicing
SECTION 3 - SERVICING
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