Multi-DENCO Servicing and Maintenance
FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020 121
10.7 Closing down procedure
It is essential for starting, closing down, emergency operation and fault finding to know
the location of the following components:
– Location of isolator for power distribution to the unit
– Main Isolator (integral to unit or local position)
– ON/OFF icon on the display of the unit
– All valves likely to affect water supply to humidifier (when fitted)
Short periods Should you require the equipment to be closed down for the weekend or Bank Holi-
days, no special precautions are required. Each unit may simply be turned off by press-
ing the ON/OFF icon. Alternatively, the "ON/OFF Times" can be configured in the
controller software.
Long periods If the plant is to be shut down for longer periods (up to a month) this can be done by
switching off at the ON/OFF icon, then setting the mains isolator to the 'OFF' position,
and closing the local mains water supply to the humidifier.
Indefinitely When the equipment is to be taken out of service for an indefinite period we recom-
mend a qualified air conditioning engineer. An engineer will also be required to restart
the equipment.
For units fitted with chilled water cooling and/or hot water heating, the mains power
should remain "ON" for at least the stroke time of the valve actuator to ensure that the
valve closes fully.
10.7.1 Freeze prevention of water pipework
If water piping is installed where the temperature may drop below freezing, it must be
completely drained. Water coils are difficult to drain therefore it is advisable to remove
any remaining water by using compressed air.
If systems are to remain out of operation for long periods, this can result in corrosion
of the inner surfaces of the piping and coils. Therefore we recommend that the hydrau-
lic system be refilled with an anti-freeze solution. The anti-freeze solution should con-
tain inhibitors. Refer to chapter 6.6.4 and ask your anti-freeze supplier for advice.
On re-commissioning the equipment, the anti-freeze solution must be drained and
properly recycled.
NOTE!
The units are designed for continuous operation and it is recommended that the sys-
tem is kept running overnight and at weekends to maintain stable room conditions.
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