1
User manual
ALFANET 71
Thermostat
VDH doc. 030504
Version: v1.1
Datum: 22-03-2004
Software: ALFA(NET)71
File: Do030504.WP8
Range: -50/+50,0°C
* 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.
