VDH ALFA 59 User Manual

User manual
ALFA 59
Hygrostat.
VDH doc: 080340
Software: ALFA59

* Installation.

On the topside of the ALFA 59 is shown how the sensor, power supply and relays has to be
connected.
After connecting the ALFA 59 to the power supply, a self test function is started. As this test is
finished the measured humidity appears in the display.

* Control.

The ALFA 59 Hygrostat can be controlled by four push buttons on the front. These keys are:
SET - view / change set point and reset alarm.
UP - increase value.
DOWN - decrease value.
%RH - hidden key above SET key and behind %RH symbol.

* View set point.

By pushing the SET key the set point appears in the display. The decimal point of the last display
starts blinking to indicate this. After a few seconds after releasing the SET key the set point
disappears and the measured temperature is shown again.

* Changing set point.

Push the SET key and the set point appears in the display. Release the SET key. Now push the
SET key again together with the UP or DOWN keys to change the set point. After a few seconds
after releasing the SET key the set point disappears and the measured temperature is shown
again.

* Status of the Relays.

By pushing the hidden  C key the display shows the status of the relays. Each display segment
shows the status of the relay output, showing 0= off and 1=on. The code 110 means relay 1 and
relay 2 are on and relay 3 is off.
Version: v1.0
File: Do080340.WPD
1
Datum:06-03-2008
Range: 0/+100%RH