VDH ALFA(NET) 52 User Manual

User manual
ALFA(NET) 52 0/+100C
Double Thermostat.
VDH doc. 072384
Software: ALFA 52 0-100C

* Installation.

On the connection diagram of the ALFA(NET) 52 is shown how the sensors, power supply and
relays has to be connected. After connecting the ALFA(NET) 52 to the power supply, a self test
function is started. As this test is finished, the measured temperature of thermostat-1 appears in the
display. Thermostat-1 works with sensor-1 and relay-1. Thermostat-2 works with sensor-2 and
relay-2. Relay-3 can function as alarm relay or functions as second stage of thermostat-2.

* Control.

The ALFA(NET) 52 thermostat can be controlled by four pushbuttons on the front These keys are:
SET - view / change set point and reset the alarm
 (UP)
- increase the set point.
 (DOWN)
- decrease the set point.
MODE - relays status key.

* Viewing the temperature of sensor-2.

By pressing the UP key, the measured temperature of sensor-2 is shown in the display. After
releasing the key, the measured temperature of sensor-1 is shown again in the display.

* Viewing set points.

Viewing set point of thermostat-1:
By pushing the SET key and then simultaneously pushing the UP key, the set point of
thermostat-1 appears in the display.
Viewing set point of thermostat-2:
By pushing the SET key and then simultaneously pushing the DOWN key, the set point of
thermostat-2 appears in the display.
A few seconds after releasing the keys the set point disappears and the measured temperature of
thermostat-1 is shown again in the display.

* Changing set points.

Push the SET key together with the UP or DOWN key in order to select the desired set point (see
above). Release the SET key. Now push the SET key again together with the UP or DOWN keys to
change the set point. A few seconds after releasing the keys, the measured temperature of sensor-
1 is shown again in the display.
Version: v1.0
File: Do072384.WPD
1
Date: 18-10-2007
Range: 0/+100C