VDH ALFANET 71-2SP User Manual

User manual
ALFANET 71-2SP
Thermostat with
2 set points
VDH doc. 080659
Software: A71NW2SP

* Installation.

On the upper side from the ALFANET 71-2SP is shown how the sensor, supply, output and relays
should be connected. After power up a self test is started. If the self test is completed the
measured temperature will be shown on the display. Normally this will be the temperature from
sensor-1 unless sensor-2 is programmed as a control sensor (P05=1). In that case the average
temperature from both sensors will be shown. This will also be the control temperature. The
ALFANET 71-2SP can be read out and controlled on the pc.

* Control.

The ALFANET 71-2SP thermostat can be controlled by four push buttons on the front:
SET - viewing / changing the adjusted value and reset alarm.
UP - raise the adjusted value.
DOWN - lower the adjusted value.
C
- hidden key above the SET key.

* Viewing and changing the set points.

Set point heating:
Set point cooling:
To change the set point it should be made visible as described. Release the keys. By pushing the
SET key again, the set point can be adjusted with the UP or DOWN keys. A few seconds after
releasing the keys the measured value will be visible again.

* Viewing separate temperature.

By pushing the UP and DOWN keys simultaneously the individual temperatures from both
sensors can be read out. After releasing the keys it is possible to read out the measured
temperature from sensor 1 by pushing the UP key and the measured temperature from sensor 2
by pushing the DOWN key. A few seconds after releasing the keys the normal temperature will be
visible again.

* Status of the Relays.

By pushing the hidden C key the display shows the status of the relays. The three digits are
indicating the status from the relays, hereby 0=off and 1=on. The code 110 means that relay 1
and relay 2 are on and relay 3 is off.
Version: v1.0
File: Do080659.WPD
By pushing the SET and the UP keys simultaneously the adjusted heating
set point will be visible. The dots from the first and the last digit also starts
flashing.
By pushing the SET and the DOWN keys simultaneously the adjusted
cooling set point will be visible. The dot from the last digit also starts
flashing.
1
Date: 21-05-2008
Range: -50/+50,0  C