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AHU Electrodes Humidifier - VEH
9 Working Principle
a)
At power-up, the humidifier performs an emptying of the tank by opening the drain for the time
value set in "T. Emptying".
b)
If the request for production is greater than zero, water is charged for the time value set in "T.
Load Water". If it is the first load of water, and then the tank is empty, the charging time will be
twice the set value.
c)
Follows a period of waiting to heat water, the duration of which is set by the parameter "T.
Heating".
d)
At the end of heating time, the system tries to balance production with the request, in the fol-
lowing way: if production is less than the request, it returns to step b. If, however, the produc-
tion is higher than the required heating phase continues until the output value becomes not
less than the requested value.
e)
If, at the end of the heating period, the current is still zero, a lack of water alarm is set.
f)
During normal operation, there is an active system for changing the water: after one hour of
operation, the system provides to the discharge of a small part of water and the relative refill-
ing. Every 4 hours, is, instead, a total change of the tank water.
g)
If the demand of production remains at zero for a period of more than 1 hours, the tank will be
emptied, to avoid the formation of bacteria.
10 Menu and Parameters
Pushing the "SET" button, you can access the configuration menu of the system. The buttons
"+" and "-" allow increasing and decreasing the parameter value. Click "OK" to confirm the new
parameter value and passes to the next. The modifiable parameters are:
10.1 ON/OFF Mode
During normal operation (not in alarm) by pressing the "RESET" button for 5 seconds, the hu-
midifier goes into OFF mode disconnecting the contactor. To resume operation press the "RE-
SET" button for 5 seconds (ON mode).
10.2 Language
Set the menu and messages language:
a. Italian (default).
b. English.
c. French.
d. German (not yet implemented)
10.3 Humidity selection
Set the source of humidity sensor:
a. Internal: in this case it is proposed to set the desired humidity value between 0 and
100%.
Internal controller uses a humidity probe 4-20mA connected at
J17.pin5 = +V
J17.pin4 = IN
J17.pin8 = GND (if needed)
b. External: in this case you have to select the type of used humidistat:
I.
II.
III.
Default: Extern humidistat. Proportional 0-10V type
10.4 Nominal Current
Set the rated current of the humidifier.
Default 20A
Elsteam S.r.l - via E. Fermi, 496 - 21042 Caronno Pertusella (va) - Tel.+39 02 9659890 - Fax +39 02 96457007
On-Off type
Proportional 0-10V type
Proportional 4-20mA type
E-mail: info@elsteam.it - Web: http://www.elsteam.com
20.2.EN
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