Carel DLAQ2DF100, User Manual

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ENG
"humiFog direct" +0300073EN rel. 1.4 - 29.03.2022
3. GENERAL DESCRIPTION
3.1 General description
humiFog Direct is a direct humidifi er for room installation. It consists
of a pumping unit (also called the cabinet) and a distribution system
(comprising blower units) to be installed directly in the room to be
humidifi ed and cooled. The pumping unit is connected to the blower
units by high pressure hoses.
The cabinet is fi tted with a pump that delivers water at high pressure (70
bars) to the nozzles on the blower units, where it is atomised into very
fi ne droplets that evaporate spontaneously.
The cabinets are available in the single zone and two-zone version. The
latter can manage two independent zones, reading two separate signals
(from a probe or external controller).
For all models, the minimum fl ow rate that can be supplied by the pump
is 10% of its nominal fl ow rate. For this reason, it is recommended to
couple a distribution line that can atomise a fl ow-rate of water equal at
least to the minimum fl ow-rate delivered by the pump.
It is important to install the distribution system in a suitable environment
(in terms of volume, air change and operating temperature) so as to
ensure absorption of the atomised water. Carel can provide support for
calculating the required humidifi cation load.
3.2 Operating principle
System operation is based on a request signal from a probe (temperature
or humidity) or external controller. When the operation consent is
enabled (remote ON/OFF) and at the same time there is a request for
humidifi cation or cooling, the system opens the delivery solenoid valve
(see par. "Structure") and activates the pump, which pressurises the water
at high pressure (70bar). After having also opened the outlet solenoid
valve, the initial stage of operation begins, involving washing and fi lling
the line, after which, when the line is fi lled and pressurised, the nozzles
will start spraying water.
Modulation is available in PWM mode (pulse width modulation): the
controller alternates a time (set on the display) in which the outlet
solenoid valves are operation, thus atomising the water, with period in
which the outlet valves are closed and the bypass valve is open, thus
interrupting atomisation into the room.
The set point is managed directly by the electronic controller using a
proportional band (P+I) or an off set when reaching the set point.
On reaching the set point, the system stops and enters standby mode,
restarting when there is a new request. For this reason, the system should
be powered on at all times.
3.2.1 Functional diagram
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5 11 2
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12
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Fig. 3.a
Key
1 Mains water line
2 Reverse osmosis system
3 Demineralised water line
4 Expansion vessel
5 humiFog Direct cabinet
6 High pressure water hoses (70 bars)
7 humiFog Direct blower units
8 Water drain point
9 On-off ball valve
10 Power supply (230V 50 Hz or 120V 60 Hz)
11 Electrical connection from cabinet to the blowers
12 Mechanical feedwater fi lter
13 Check valve