VDH ALFANET 71 User Manual

User manual
ALFANET 71
Thermostat
VDH doc. 030504
Software: ALFA(NET)71
* Installation.
On the top side of the ALFANET 71 is shown how the sensors, power supply and relays are to be
connected.
After connecting the ALFANET 71 to the power supply, a self test function is started. As this test is
finished the measured temperature appears in the display. Normally this is the temperature of
sensor-1, unless sensor-2 is active as control sensor (P05=1) in that case the average
temperature of both sensors is displayed and used for control. And the ALFANET 71 is by use of
the ALFANET PC-INTERFACE controllable on the PC.
* Control.
The ALFANET 71 thermostat can be controlled by four pushbuttons on the front. These keys are:
SET - view / change the setpoint.
UP - increase the setpoint.
DOWN - decrease the setpoint.
°C - hidden push button above the SET key and behind °C symbol.
* Viewing setpoint.
By pushing the SET key the setpoint appears in the display. The decimal point of the last display
starts blinking. A few seconds after releasing the SET key the setpoint disappears and the
measured temperature is shown again in the display.
* Changing setpoint.
Push the SET key and the setpoint appears in the display. Release the SET key. Now push the
SET key again together with the UP or DOWN keys to change the setpoint. A few seconds after
releasing the keys the measured temperature shows again in the display.
* Viewing the individual sensors.
By pressing the UP and DOWN key together, the individual sensors can be show in the display.
After releasing the keys, the measured temperature of sensor-1 can be shown by pushing the UP
key or the measured temperature of sensor-2 can be shown by pushing the DOWN key. A few
seconds after releasing the keys the (average) temperature shows again in the display.
* 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 2
are on and relay 3 is off.
Version: v1.1
File: Do030504.WP8
1
Datum: 22-03-2004
Range: -50/+50,0°C