VDH ALFA 15 User Manual

User manual
ALFA 15 and
ALFANET 15
Cool/Defrost Thermostat.
VDH doc. 061283
Software: 043376_ALFA 15/25/35
* Function.
The ALFA(NET) 15 is a digital thermostat for rail mounting. The thermostat controls the cooling and
defrost. The temperature readout is in hole degrees Celsius.
Defrost will be done by temporarily switching off the cooling (natural defrost). The defrost starts on
intervals or on compressor runtime. The defrost stops on time.
The ALFANET 15 has a RS 485 network connection so it can be read out and adjusted on the Alfanet.
* Installation.
On the connection diagram of the ALFA(NET) 15 you can see how the sensor, power supply and relay
have to be connected.
After connecting the ALFA(NET) 15 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(NET) 15 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 is show in the display.
Version: v2.1
File: Do061283.wpd
1
Date: 05-12-2007
Range: -50/+50C per 1C