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Maintenance – Glow-worm Ultracom2 cxi User Manual

Page 51

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0020085231_02 - 05/10 - Glow-worm

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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 (26) from the main board.

• Disconnect the electrical plug (25) from the pump head.

• Remove the four cap head screws (27).

• Carefully remove the pump head (28) together with cable.

Do not strain cable.

• Reconnect wiring to new pump head and fit cover.

• Fit the new pump head by repeating the operations in

reverse.

19.4.2

Safety discharge valve

• Drain the boiler heating circuit as described in the

appropriate chapter "Draining".

• Undo the safety discharge valve union and remove from the

pipework (7).

• Remove the securing clip (6) and withdraw the safety

discharge valve (8).

• Fit new ‘O’ ring. Refill, vent and pressurise the boiler.

19.4.3

Automatic air vent

• Drain the boiler heating circuit as described in the

appropriate chapter "Draining".

• Remove the retaining clip (29).

• Remove the automatic air vent (20).

• Fit the new automatic air vent and ‘O’ ring ensuring the vent

cap is left loose.

• Refill, vent and pressurise the boiler.

19.4.4

Low water pressure sensor

• Drain the boiler heating circuit as described in the

appropriate chapter "Draining".

• Disconnect the electrical lead (15).

• Remove the retaining clip (17), remove the low water

pressure sensor (16).

• Fit the new low water pressure sensor.

• Refill vent and pressurise the boiler.

19.4.5

Flow sensor

• Drain the boiler hot water circuit as described in the

appropriate chapter "Draining".

• Remove the side securing clip and the electrical connection (4).

• Disengage the flow sensor (5).

• After replacing the flow sensor, open the cold-water isolation

valve and slowly open a hot water tap to remove air.

19.4.6

bypass

• Drain the boiler heating circuit as described in the

appropriate chapter "Draining".

• Remove the retaining clip (23) to remove the bypass screw (24).

• After replacing the bypass, refill, vent and pressurise the

boiler.

19.4.7

Three way valve

• Drain the boiler heating circuit as described in the

appropriate chapter "Draining".

• Disconnect the electrical plug (1).

• Remove the two retaining screws (2).

• Remove the three way valve (3).

• Fit new three way valve assembly.

• Refill, 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 (10).

• Open the two retaining brackets (9).

• Remove the plate-to-plate heat exchanger (14) by lifting it up.

• When replacing the plate-to-plate heat exchanger, ensure

that the four rubber sealing washers are fitted into the

hydroblock.

NOTE: The plate-to-plate heat exchanger only fits one way.

• Refill, vent and pressurise the boiler.

MAINTENANCE