CEA 4001 - Page 131

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When a zone (or zones) is charged or recharged with water after draining, the flushing valve(s) (see
D.3.3) shall be used to check that water is available in the zone (or zones).
Individual alarm valves in a duplicate control valve set, where required, shall be separately
serviced, provided the water supply to the installation is maintained.
The following procedure shall be followed before servicing duplicate control valve sets:
- the stop valves to the duplicate alarm valve shall be checked and if necessary opened.
One of the stop valves to the alarm valve to be serviced shall be closed and an alarm test
(see 18.3.2.3) carried out immediately on the other alarm valve;
- if water is not available, the stop valve shall be opened immediately, and the fault
rectified before proceeding.