VDH ALFA 71 MODulation User Manual
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1User manualALFA 71 MODulationThermostat.0-100CVDH doc. 080349 Version: v1.0 Date: 07-03-2008Software: ALFA71MOD100 File: DO080349.WPD Range: 0/+100,0C* Installation.On the top side of the ALFA 71 MOD is shown how the sensors, power supply and relays has to beconnected.After connecting the ALFA 71 MOD to the power supply, a self test function is started. As this testis finished the measured temperature appears in the display.* Control.The ALFA 71 MOD 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 set point.By pushing the SET key the set point appears in the display. The decimal point of the last displaystarts blinking. A few seconds after releasing the SET key the setpoint disappears and themeasured temperature is shown again in the display.* Changing set point.Push the SET key and the set point appears in the display. Release the SET key. Now push theSET key again together with the UP or DOWN keys to change the setpoint. A few seconds afterreleasing the keys the measured 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 segmentshows the status of the relay output, showing 0=off and 1=on. The code 110 means relay 1 and 2are on and relay 3 is off.* Readout valve position.By pushing the UP key the display shows the current valve position. |
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