Glow-worm Ultracom cx - Manual (Page 59)

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15 Replacement of Parts
15.17 Pump (head only)
For access, refer to section 15.1.
Drain the boiler heating circuit as described in the appropriate
section of 15.1.
Refer to diagram 15.12.
Remove the four cap head screws.
Carefully remove the pump head together with cable. Do not
strain cable.
Support the pump head, unscrew cable cover at the side of
pump head and take off.
Disconnect wiring from pump head.
Reconnect wiring to new pump head and fit cover.
Fit the new pump head with ‘O’ ring.
Complete pump replacement
For access, refer to section 15.1.
Drain the boiler heating circuit as described in the appropriate
section of 15.1.
Refer to diagram 15.12, 15.13.
Remove the pump head as described in section 15.17.
Remove the safety discharge valve as described in section
15.18.
Disconnect the expansion vessel pipe at the coupling, see
diagram 15.6 and at the pump housing by removing the
securing clip, see diagram 15.12.
Disconnect the central heating flow pipe union connection and
withdraw the pump securing clip.
Spring back the rear location bracket to release the pump
housing and gently rotate backwards and forwards whilst
easing the pump to the right to disengage from the 3 way
valve.
15.18 Safety Discharge Valve
For access, refer to section 15.1.
Drain the boiler heating circuit as described in the appropriate
section of 15.1.
Refer to diagram 15.13.
Undo the safety discharge valve union and remove from the
pipework.
Remove the securing clip and withdraw the safety discharge
valve.
Fit new ‘O’ ring.
Refill, vent and pressurise the boiler.
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13256
Diagram 15.13
Diagram 15.12
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