Carel humiFog direct DLA02DF000, User Manual

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ENG
"humiFog direct" +0300073EN rel. 1.2 - 02.05.2019
1. GENERAL DESCRIPTION AND MODELS
1.1 General description
humiFog Direct is a direct humidifier 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
humidified and cooled. The pumping unit is connected to the blower
units by high pressure hoses.
The cabinet is fitted with a pump that delivers water at high pressure (70
bars) to the nozzles on the blower units, where it is atomised into very
fine 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 flow rate that can be supplied by the pump
is 10% of its nominal flow rate. For this reason, it is recommended to
couple a distribution line that can atomise a flow-rate of water equal at
least to the minimum flow-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 humidification load.
1.2 Operating principle
System operation is based on a request signal from a probe (temperature
or humidity) or external controller. When operation is enabled (remote
on/off ) and at the same time there is a humidification or cooling request
signal, the system opens the fill solenoid valve and activates the pump,
which pumps the water at high pressure (70 bars). After having also
opened the outlet solenoid valve, the initial stage of operation begins,
involving washing and filling the line, after which, when the line is filled
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 offset 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.
1.2.1 Functional diagram
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Fig. 1.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 filter