VDH ALFA 33 DP User Manual

ALFA(NET) 33 DP -10/+90 / C (0,1)
Minimum / Maximum Alarm Thermostat.
VDH doc. 120548
Software: 0726443 ALFA 13/23/33 DP2 F

* Function.

The ALFA(NET) 33 DP is a digital alarm thermostat for panel mounting. The temperature is readout
in tents of degrees Celsius. The thermostat watches the minimum and maximum temperature. To
report a alarm the ALFA(NET) 33 DP has one relay for both alarms.
The ALFANET 33 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) 33 DP you can see how the sensor, power supply and relay have
to be connected.
After the ALFA (NET) 13 DP is connected to the power supply, it takes a few seconds to show the
measured temperature in the display.
The alarm relay is a multi functional combined minimum- and maximum-alarm, at alarm the LED 'set
high' is lit in the display.

* Control.

The ALFA(NET) 33 DP alarm thermostat can be controlled by three pushbuttons on the front;
SET
UP
DOWN

* Viewing setpoints.

Viewing setpoint of maximum alarm:
By pushing the SET key first and then the UP key together the maximum alarm setpoint appears
in the display. The led 'set high' starts blinking.
Viewing setpoint of minimum alarm:
By pushing the SET key first and then the DOWN key together the maximum alarm setpoint appe-
ars in the display. The led 'set low' starts blinking.
A few seconds after releasing the keys the setpoint disappears and the measured temperature is
shown in the display.

* Changing setpoints.

Push the SET key together with the UP or DOWN key and the maximum alarm setpoint or minimum
alarm setpoint appears in the display. Release both keys.
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

Version: v1.0
File: Do120548.wpd
- view / change setpoints and reset of alarm.
- increase a value.
- decrease a value.
Range: -10/+90 / C readout per 0,1 / C
1
Date: 29-05-2012