15 replacement of parts – Glow-worm Ultrapower sxi Range User Manual

Page 61

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15.15 Central Heating Pump

For access, refer to section 15.1.
Drain the boiler heating circuit, see section 15.1.
Unscrew the union nut of the return pipe to the pump

connection, see diagram 15.11.
Unscrew the union nut from the safety discharge valve.
Remove the flexible connection from the CH pump, see

diagram 15.7.
Disconnect the electrical connections inside the control box to

the main PCB, see diagram 15.11.
Remove the securing screw from the pump retaining bracket

and ease off the bracket from the spigot on the rear of the

pump.
Remove the pump retaining clip.
The pump can now be pulled sidewards away from its three

way valve connection.
When re-fitting, ensure that all seals are in place.
Always vent the pump after re-fitting.

15.16 Three Way Valve

For access, refer to section 15.1.
Remove the CH pump, refer to section 15.15.
Refer to diagram 15.12.
Remove the electrical plug.
Undo the CH inlet connection at the union nut between the

boiler module and the tank module, remove the connector

locknut.
Remove the retaining clip.
Remove the three securing screws.
Carefully remove the three way valve assembly.

15 Replacement of Parts

15.17 Domestic Pump

For access, refer to section 15.1.
Drain the boiler domestic water circuit, see section 15.1.
Remove the domestic expansion vessel and place in its

service position, see diagram 13.6.
Disconnect the electrical connection from the main PCB, see

diagram 15.13.
Unscrew the union nut at the pump top connector to the DHW

pipe.
Unscrew the pipe union nut from the bottom pump connection,

see diagram 15.13.
Remove pump securing clip at the bottom pump connection.

The pump can now be lifted up and clear of the boiler.
Remove the pump top and bottom connectors making note of

the orientation of the top connection.
When re-fitting the top and bottom connectors ensure that

the rubber seals are in place and that the top connector is

orientated correctly, with the DHW pipe connection at 90

O

to

the pump axis.
When re-fitting any part, ensure that all seals and clips are in

place.
Always vent the pump after re-fitting.
After replacing parts open the cold-water isolation valve and

slowly open a hot water tap to remove air. Close the hot water

tap and check for any leaks.

3 WAY

VALVE

RETAINING

CLIP

ELECTRICAL

PLUG

SECURING

SCREW (3 OFF)

CH PUMP

CH INLET

CONNECTION

Diagram 15.12

13410

DOMESTIC

PUMP

SECURING

CLIP

BOTTOM

PUMP

CONNECTOR

UNION

NUT

ELECTRICAL

CONNECTION

UNION

NUT

UNION

NUT

TOP PUMP CONNECTOR

13336

Diagram 15.13

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