VDH ALFA(NET) 33 User Manual
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1User ManualALFA(NET) 33 (0-400OC)Min./Max. Alarm thermostat.VDH doc. 072382 Version: v1.0 Date: 16-10-2007Software: ALFA(NET) 13/33 0-400C File: Do072382.WPD Range: 0/+400C, readout per 1C* Function.The ALFA(NET) 33 is a digital alarm thermostat for panel mounting. The thermostat watches theminimum and maximum temperature. The ALFA(NET) 33 has one relay for both alarms.The ALFANET 33 has a RS 485 network connection so it can be read out and adjusted on the Alfanet.* Installation.On the topside of the ALFA(NET) 33 you can see how the sensor, power supply and relay has to beconnected.After connecting the ALFA(NET) 33 to the power supply, a self test function is started. As this test isfinished, the measured temperature appears in the display.The relay is normally activated. As an alarm appears it will be deactivated and the led 'on' will light-upin the display.* Control.The ALFA(NET) 33 alarm thermostat can be controlled by three pushbuttons on the front;SET - view / change set points and reset of alarm.UP - increase a value.DOWN - decrease a value.* Viewing setpoints.Viewing set point of maximum alarm:By pushing the SET key first and then the UP key simultaneously the maximum alarm set pointappears in the display. The led 'set high' starts blinking.Viewing set point of minimum alarm:By pushing the SET key first and then the DOWN key simultaneously the maximum alarm set pointappears in the display. The led 'set low' starts blinking.A few seconds after releasing the keys the set point disappears and the measured temperature isshown in the display again.* Changing set points.Push the SET key together with the UP or DOWN key and the maximum alarm set point or minimumalarm setpoint appears in the display. Release both keys.Now push the SET key again and with the UP or DOWN keys the set point can be changed. A fewseconds after releasing the keys the measured temperature shows again in the display. |
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