1User manual ALFA 31Cool/Heat Thermostat.VDH doc. 931224 Version: v1.3 Date: 22-08-1995Software: ALFA31DP File: DO931224.WP8 Range: -50/+50°C per 1°C* Installation.On the topside op the ALFA 31 you can see how the sensor, power supply and relay have to beconnected.After connecting the ALFA 31 to the power supply, a self test function is started. As this test is finishedthe measured temperature appears in the display.When the relay is activated, the led 'on' will light-up in the display.* Control.The ALFA 31 thermostat can be controlled by three pushbuttons on the front. These keys are:SET - view / change the setpoint.UP - increase the setpoint.DOWN - decrease the setpoint.* Viewing setpoint.By pushing the SET key the setpoint appears in the display. The led 'set' starts blinking. A fewseconds after releasing the SET key the setpoint disappears and the measured temperature is shownin the display.* Changing setpoint.Push the SET key and the setpoint appears in the display. Release the SET key. Now push the SETkey again and together with the UP or DOWN keys the setpoint can be changed. A few seconds afterreleasing the keys the measured temperature shows again in the display.