VDH ALFA 25 DP User Manual

User Manual
ALFA 25 DP and
ALFANET 25 DP
Cool/Defrost
Thermostat
VDH doc: 072254
Software: 043377_ALFA 15/25/35DP

* Function.

The ALFA(NET) 25 DP is a digital thermostat for panel mounting. The thermostat
controls the cooling and defrost. 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 25 DP 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) 25 DP is shown how the sensor, power supply and
relay have to be connected.
After connecting the ALFA(NET) 25 DP 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) 25 DP Thermostat can be controlled by three push buttons on the
front. These keys are:
SET - view / change the set point.
UP - increase the set point.
DOWN - decrease the set point.

* Viewing set point.

By pushing the SET key the set point appears in the display. The led 'set' starts
blinking. A few seconds after releasing the SET key the set point disappears and the
measured temperature is shown in the display.
Versie: v1.1
File: Do072254.wpd
1
Datum: 07-11-2007
Range: -10/+40C per 0,1C