Nortec ME Direct Feed - Manual (Page 24)

24 Operation
4.6 Decommissioning the system
In order to decommission the Nortec ME Direct Feed (e.g. to perform maintenance works, to eliminate
a malfunction, etc.) perform the following steps:
1. Close the shut-off valve in the water supply line.
2. Switch off control unit: switch off
and
switch on the control unit (only with Nortec control units).
Note: if your system is equipped with a control unit other than Nortec, please refer to the correspond-
ing manual for switching off the control unit.
5. Disconnect control unit from the mains: switch off the electrical isolator in the mains supply to
the control unit and secure switch in “Off” position against accidentally being switched on, or clearly
mark the switch.
6. Let the fan of the ventilation system run until the evaporative module is dry.
7. If work has to be carried out on the evaporative module or the hydraulic manifold mounted inside
the duct, switch off the AHU and secure the system against accidentally being switched on.
Important Notes!
– This applies only for systems equipped with the optional Nortec control unit and the optional purge
valve: for reasons of hygiene, we recommend that the control unit should be left powered on even if
the Nortec ME Direct Feed is not being used for a longer period of time. Only the
Cooling On/Off> switch should be switched off. This keeps the hygiene functions (e.g. periodical
flushing of water supply pipe) active and hence the build-up of germs is opposed.
– If the Nortec ME Direct Feed is isolated from the mains for prolonged periods, water stagna-
tion might occur in supply pipework and microbial contamination result, therefore the system,
including any storage tanks or vessels should be drained and left dry. Before putting the system
back into operation, a full risk assessment should be undertaken to ensure safe operation, with
particular attention paid to water supply quality. Additionally a complete system service has to
be performed prior to putting the system back in operation.