FläktGroup Multi-DENCO, Руководство по эксплуатации

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Multi -DENCO Technical Description
FläktGroup DC-2013-0101-GB • Subject to modifications • R4-05/2018 29
Heating (if fitted) If the indoor temperatures are too low then the heating function will be activated. There
are several options for this operation allowing the heating to be a start/stop operation
or variable. When heating is required, the fans can increase their speed.
Humidification (if fitted) If the humidity levels are below the requirements then the humidifier will be activated
to add more moisture to the air. The amount of moisture added to the air varies propor-
tionally to the demand, with the humidifier able to operate between 25 - 100% of its
rated capacity.
Dehumidification (if enabled) As a default factory settings, dehumidification is a secondary priority compared to tem-
perature control, therefore it will only become active and maintained if the temperature
limits are met during the whole operation. If at any point, those limits are not met, the
dehumidification operation will be stopped and the unit will operate on a temperature
control basis.
To perform dehumidification, the unit cools at a higher rate (i.e. over-cools the air) to
create condensate on the the heat exchanger coil. Heating options can then be used
to re-heat the air before it leaves the unit.
Software settings can be changed to deactivate the dehumidification modes, even if
components are fitted.
CombiCool (if fitted) The CombiCool options has two separate cooling circuits. CombiCool can be fitted to
A- & C-versions of the
Multi -DENCO units.
The CombiCool circuit is the primary circuit and is chilled water. The secondary circuit
relates to the version (e.g. A-Version, C-Version). The unit will only operate one circuit
at a time.
If the CombiCool circuit is unable to meet the cooling requirements of the room then
the unit changes to use the 'secondary' circuit. When possible, the unit will try to switch
back to the 'primary' CombiCool circuit.
This feature is ideal to provide internal redundancy to each unit.
CombiCool FreeCool
(if fitted)
The unit is fitted with the same CombiCool Coil as above, but can be configured with a
FreeCool strategy. When the Cooling Demand is low, the unit will operate with only the
FreeCool circuit operating. If this demand increases above a certain threshold, the unit
will then activate its secondary circuit (direct expansion or chilled water) and both cir-
cuits to operate at the same time to meet the cooling requirements.
An ambient sensor can be used to measure the outdoor temperatures. If the ambient
temperature is high (above a set value), then the FreeCool circuit will be deactivated
and only the secondary circuit will operate. Once the ambient temperature has reduced
then the FreeCool circuit will become available again.
3.4 Operating strategies
Multi -DENCO's inbuilt advance software combined with the latest EC variable techno-
logy and networking capability, enables the unit to operate with intelligent control stra-
tegies to increase performance or maximise energy savings. In most instances we
would recommend using a Running Redundancy strategy to help maximise the energy
savings possible.
Duty/standby operation Within a room there may be additional units installed as a backup to maintain cooling
performance in case there is an alarm or failure on a unit. A common description is an
'N+1' setup, where N describes the number of units required to cool a room. By using
the network capability of the unit, upon failure, a signal can be sent to start the standby
unit.
The network of units can be configured so that the unit designated as 'standby' is chan-
ged over after a pre-set period to ensure even wear over their lifetimes.