Vertical humidifier for installation in AHU-VEH Rel. 13v01.UK pag. 10
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8
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 "(default 30").
b)
If the request for production is greater than zero, water is charged for the time value set in "T.
Load Water "(default 10"). 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. Heat-
ing "(default 120").
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 request, the control system decreases the current provided to electrodes.
If the output current is choked showing less than 60% in time, small amounts of water are purged,
up to exceed the threshold of 60%. The purge duration is defined by the parameter "T. Drain "(de-
fault 1").
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 op-
eration, the system provides to the discharge of a small part of water and the relative refilling.
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 4 hours, the tank will be
emptied, to avoid the formation of bacteria.
9
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 pa-
rameter value and passes to the next. The modifiable parameters are:
9.1
Language
Set the menu and messages language:
a.
Italian (default).
b.
English.
c.
French.
d.
German (not yet implemented)
9.2
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%.
??????
b.
Extern: in this case you have to select the type of used humidistat:
I.
On-Off type
II.
Proportional 0-10V type
III.
Proportional 4-20mA type
Default: Extern humidistat. Proportional 0-10V type
9.3
Nominal Current
Set the rated current of the humidifier.
Default 20A
9.4
Drain time.
Set the time during which the drain system remains open to allow emptying of the tank. The time
is in seconds, from 1 to 250.
Default 30”.
