VDH ALFA 72-VS User Manual
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1User manualALFA 72 VS 0-20OCDifferential Thermostat.VDH doc. 080333 Version: v1.2 Date: 22-04-2010Software; File: Do080333.wpd Static range (see sticker);992903 ALFA 52/72 VS 20 -50..+50 Typenr. 904.000702 -50/+50,0C100320 ALFA 52/72 VS 20 -20..+80 Typenr. 904.000925 -20/+80,0C992901 ALFA 52/72 VS 20 0..+100 Typenr. 904.000678 0/+100,0C* Installation.On the connection diagram of the ALFA 72-VS is shown how the sensors, power supply and relayshas to be connected. After connecting the ALFA 72-VS to the power supply, a self test function isstarted. As this test is finished, the measured differential temperature of sensor-1 minus sensor-2appears in the display.* Control.The ALFA 72-VS thermostat can be controlled by four pushbuttons on the front These keys are:SET - view / change set point and reset the alarm (UP) - increase the set point. (DOWN) - decrease the set point.C - hidden key under unit symbol* Viewing the temperature from sensor-1 and sensor-2.By pressing the UP and DOWN keys simultaneously and after that the UP key, the measured valuefrom sensor-1 can be read-out. If the down key is pressed, the measured value from sensor-2 isshown. If no key is pressed for a few seconds, the differential temperature is shown again.* Viewing the delta-setpoint.Viewing set point delta thermostat:By pushing the SET key, the set point of delta thermostat appears in the display.A few seconds after releasing the keys the set point disappears and the differential temperature isshown again in the display.* Changing the delta-setpoint.Push the SET key. The delta-setpoint appears in the display. Release the SET key. Now push the SETkey again together with the UP or DOWN keys to change the set point. A few seconds after releasingthe keys, the measured differential temperature is shown again in the display.* Status of the Relays.By pushing the hidden C key the display shows the status of the relays. Each digit shows the statusof one relay output, showing 0=off and 1=on. The code 110 means relay 1 and 2 are on and relay 3is off.Relays 1 and 2 are used for the differential thermostat (see function diagram).Relay 3 is used as an alarm relay. |
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