AHU Resistors Humidifier - REH
21.2.EN
10
Elsteam S.r.l - via E. Fermi, 496 - 21042 Caronno Pertusella (va) - Tel.+39 02 9659890 - Fax +39 02 96457007
E-mail: [email protected] Web: http://www.elsteam.com
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".
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. Heat-
ing".
d)
At the end of heating time, the system tries to balance production with the request, in the following
way: if production is less than the request, it returns to step b. If, however, the production is higher
than the required heating phase continues until the output value becomes not less than the re-
quested 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 opera-
tion, 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 emp-
tied, to avoid the formation of bacteria.
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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:
9.1
ON/OFF Mode
During normal operation (not in alarm) by pressing the "RESET" button for 5 seconds, the humidifier
goes into OFF mode disconnecting the contactor. To resume operation press the "RESET" button for 5
seconds (ON mode).
9.2
Language
Set the menu and messages language:
a.
Italian (default).
b.
English.
c.
French.
d.
German (not yet implemented)
9.3
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.
On-Off type
II.
Proportional 0-10V type
III.
Proportional 4-20mA type
Default: Extern humidistat. Proportional 0-10V type
9.4
Nominal Current
Set the rated current of the humidifier.
Default 20A
9.5
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 120”.
