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User Manual
ALFA 21 and
ALFANET 21
Cool/Heat
Thermostat
O
0-100
C
VDH doc: 070706
Software: 053273_ALFA 11/21/31 0-100 File: Do070706.wpd
* Function.
The ALFA(NET) 21 is a digital thermostat for panel mounting. The function from
the thermostat can be programmed for cooling or heating.
The ALFANET 21 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) 21 is shown how the sensor, power supply and
relay have to be connected.
After connecting the ALFA(NET) 21 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) 21 Thermostat can be controlled by three push buttons on the
front.
These keys are:
SET
- view / change the setpoint.
UP
- increase the setpoint.
DOWN - decrease the setpoint.
Version: v1.0
1
Date: 04-07-2007
Range: 0/+100C per 1C
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Summary of Contents for VDH ALFA 21
- Page 1 User Manual ALFA 21 and ALFANET 21 Cool/Heat Thermostat 0-100 VDH doc: 070706 Version: v1.0 Date: 04-07-2007 Software: 053273_ALFA 11/21/31 0-100 File: Do070706.wpd Range: 0/+100C per 1C * Function. The ALFA(NET) 21 is a digital thermostat for panel mounting. The function from the thermostat can be programmed for cooling or heating.
- Page 2 * 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.
- Page 3 - Replace the sensor. EE - Settings are lost. Solution: - Reprogram the settings. * Technical details. Model : ALFA 21 Cool/Heat Thermostat ALFANET 21 Cool/Heat thermostat with Network : 0/+100 C, readout per 1 C Range Supply...
- Page 4 * Dimensions. * Connections. * Adresse. VDH Products BV Tel: +31 (0)50 - 30 28 900 Produktieweg 1 Fax: +31 (0)50 - 30 28 980 9301 ZS Roden Email: info@vdhproducts.nl Nederland Internet: www.vdhproducts.nl...
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