Technical Description Multi-DENCO
30 FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020
5EC fan
All Multi-DENCO units use direct driven, variable speed, high efficiency EC plug back-
ward curved fan with three dimensional profiled blades as standard. The impeller is
optimally balanced according to ISO1940 and fan speed modulates on standard set-
tings.
The fan is made of a composite material and variable speed regulation is performed
using a 0-10 V control signal. An EC drive motor with an internal overload protection is
integrated in the fan. Fan operation is monitored using a current relay. In the event of
a fan failure, all other functions are interlocked, to prevent their operation.
6 Filters
Multi-DENCO units are provided with G4 class filters as standard, with high efficiency
F7 filters or G4 washable filters (limited regions) available. The filters are positioned
directly in front of the coil and are replaceable from the front of the unit. Other filters
can be supplied upon request.
7 Humidifier
An electrode boiler humidifier can be installed into the unit to allow humidity to be con-
trolled. The humidifier generates steam using proportional regulation of untreated
mains cold water. Electrode boiler humidifiers generate sterile, odourless steam free
of mineral deposits. The humidifier has an inlet hose connection and a water drain con-
nection to remove any remaining water.
8 Electric heater
Units with electrical heating are equipped with sturdy sheathed elements with stainless
steel finning and rated to operate at black heat in order to prevent annealing conditions
and sparking. Overheat protection is provided through a thermostat (Klixon). The avail-
able heating duty is sufficient to prevent low supply temperatures in the dehumidifica-
tion mode.
Electric heating can also have an integrated thyristor control to provide variable heating
loads and closer control.
Low-pressure, hot water options are also available as an alternative heating method.
9 Electronic Expansion Valve (EEV)
The electronic expansion valve is an efficient, service friendly, refrigerant metering
device that accurately controls the superheat of the refrigerant within the cooling coil.
It is controlled through set parameters in the C5-12 controller and software and
requires no external adjustment throughout its working life.
The EEV has the ability to close itself in the event of a power failure by using a power
supply stored within the C5-12 controller.
10 and 11 Compressor and inverter
Multi-DENCO units use variable speed inverter compressors. These operate using
R410A and have a high efficiency using a permanent magnet and brushless DC
Motors.
Within the unit, the configuration can be; single compressor, in tandem with a fixed
speed compressor or in tandem with another inverter compressor.
The compressors are provided with Neoprene anti-vibrational mounts, motor protec-
tion against overcurrent and thermal overload and are able to p
erform periodical oil
reclaim on a cyclical basis.
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