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VDH doc. 931224
Software: ALFA31DP
* Installation.
On the topside op the ALFA 31 you can see how the sensor, power supply and relay have to be
connected.
After connecting the ALFA 31 to the power supply, a self test function is started. As this test is finished
the 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 few
seconds after releasing the SET key the setpoint disappears and the measured temperature is shown
in the display.
* Changing setpoint.
Push the SET key and the setpoint appears in the display. Release the SET key. Now push the SET
key again and together with the UP or DOWN keys the setpoint can be changed. A few seconds after
releasing the keys the measured temperature shows again in the display.
User manual ALFA 31
Cool/Heat Thermostat.
Version: v1.3
File: DO931224.WP8
1
Date: 22-08-1995
Range: -50/+50°C per 1°C
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Summary of Contents for VDH ALFA 31
- Page 1 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 be connected. After connecting the ALFA 31 to the power supply, a self test function is started. As this test is finished the measured temperature appears in the display.
- Page 2 If the required parameter is selected, the value can be read-out by pushing the SET key. Pushing the UP or DOWN keys together with the SET key allows you to change the value of this parameter. If after 20 seconds no key is pushed, the ALFA 31 changes to its normal operation mode. * Adjustment sensor.
- Page 3 * Parameters ALFA 31. PARA- DESCRIPTION PARAMETER RANGE STANDARD METER VALUE Switching differential 1..15°C Minimum setpoint -50..+50°C Maximum setpoint -50..+50°C Offset temperature sensor -15..+15°C Startup delay after power failure 0..99 min. Relays on at sensor failure 0 = No 1 = Yes...
- Page 4 * Dimensions. * Connection Diagram. * Function Diagram.
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