Carel humiSonic UU02, User Manual

Page: 47 / 68

15
ENG
Direct version for room applic. +0300062IE - rel. 1.1 - 16.11.2017
5.6 Accessing and setting parameters
The configuration parameters can be used to set and control humidifier
functions and status. From the main screen press:
•
ENTER for 2 seconds;
•
enter the password 77 using UP or DOWN;
•
ENTER to confirm and access the list of parameters;
•
UP or DOWN to scroll the list;
•
ENTER to select a parameter (display: ‘set’);
•
UP to modify (increase) the value of the parameter. To scroll faster press
DOWN together;
•
DOWN to modify (decrease) the value of the parameter. To scroll faster
press UP together;
•
ENTER to save the new value and return to the list of parameters, or ESC
to return to the list without saving the value.
Press ESC to return to the main screen.
5.7 Parameters: Recall default values
The default values of the parameters can be recalled at any time from the
main screen. From the main screen press:
•
ENTER for 2 seconds;
•
enter the password 50 using UP or DOWN and press ENTER;
•
dFt appears, press ENTER and dFt is flashing: press ENTER again to have
up the factory settings, or ESC to exit.
If no button is pressed for 30 seconds, the display returns to the main
screen without recalling the default values.
5.8 Reset hour counter from display
•
Access parameter ‘d3’ (see chapt. “Configuration parameter”);
•
press UP and DOWN for 5 seconds.
When reset is complete, ‘res’ is shown on the display.
6. OPERATING PRINCIPLES
6.1 Ultrasonic atomisation
Ultrasonic humidifiers atomise water through propagation of a wave
generated by a piezoelectric element to the surface of the water. Droplets
of water thus form on the surface, with the smaller ones being carried
air by the forced air flow. The quantity of atomised water depends on
water level, water temperature and distribution in the air. Water level is
kept constant using fill and drain valves, and a level sensor. Demineralised
water is recommended: if using mains water, the scale that accumulates
over time will foul the piezoelectric transducer, affecting atomisation. To
avoid excessive scaling, humidifier periodically drains and automatically
refills the water (periodical washing)
6.2 Control principles
The humidifier can be controlled using the following signals:
•
remote ON/OFF;
•
Humidity probe (set by dipswitch);
•
Serial.
ON/OFF control
The action is all or nothing, activated by an external contact that
consequently determines the control set point and differential. The
external contact may be a humidistat, whose status determines the
operation of the humidifier:
•
contact closed: the humidifier produces atomized water if the remote
ON/OFF contact is also closed;
•
contact open: atomized water production ends.
Proportional control (only with auxiliary card)
•
Atomized water production is proportional to the value of a signal “Y”
from an external device. The type of signal can be selected between the
following standards: 0 to 10 Vdc, 2 to 10 Vdc, 0 to 20 mA, 4 to 20 mA;
•
Maximum humidifier production, corresponding to the maximum
value of the external signal, can be set from 10% to 100% of the rated
value of the humidifier (parameter P0).
Minimum production has an activation hysteresis, equal to the value of P1
(default 5% of the proportional band of external signal “Y”).
ON OFF
P1 P1
P0
10%
Y
Produzione Acqua nebulizzata
Atomized water production
Fig. 6.a
Automatic control with humidity probe
Humidity production is controlled based on the reading of the relative
humidity probe (TH or connection via optional card).
The humidifier will produce until reaching the set point (St, default 50
%rH), with a settable activation hysteresis (P1 default 5%) (see the figure)
to maintain the set point.
P0
% rH
P1 P1
St
Produzione Acqua nebulizzata / Atomized water production
Fig. 6.b
6.3 Flow-rate modulation (Dipswitch 8 and
Off)
Atomised water flow-rate can be varied from 5% to 100% (parameters Pm
and P0) by alternating on-off cycles of the transducers over a set period
(parameter b7, default 1 second).
Flow-rate is set based on parameter P0 (default 100%) and the request
from the external signal (with optional card and proportional control).
ON
t
OFF
Periodo / Period (b7)
Trasduttore /
Transducer
Portata /
Flow rate
10%
Fig. 6.c