VDH ALFA 21 Bedienungsanleitung

User Manual

ALFA 21 and

ALFANET 21

Cool/Heat

Thermostat

0-100OC

VDH doc: 070706 Version: v1.0 Date: 04-07-2007

Software: 053273_ALFA 11/21/31 0-100 File: Do070706.wpd Range: 0/+100C per 1C

*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.

*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 at 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

shows again in the display.

*Setting internal parameters.

Next to the adjustment of the setpoint, some internal settings are possible like

differential, sensor-offset, setpoint range and the function cooling or heating.

By pushing the DOWN key more than 10 seconds, you enter the 'internal

programming menu'. In the left display the upper and lower segment are blinking.

Over the UP and DOWN keys the required parameter can be selected (see table for

the parameters).

If the required parameter is selected, the value can be read-out by pushing the SET

key. Pushing the UP or DOWN keys together with the SET key allows you to change

the value of this parameter.

If after 20 seconds no key is pushed, the ALFA(NET) 21 changes to it's normal

operation mode.

*Parameters ALFA(NET) 21.

Para-

meter

Description Parameter Range Standard

Value

Switching differential

Minimum setpoint

Maximum setpoint

Offset temperature sensor

1..30C

0..+100C

-15..+15C

+100

Startup delay after power failure

Relays on at sensor failure

0..99 Minutes

0 = No, 1 = Yes

Function cooling or heating

Switch on delay relays 1)

Switch off delay relays 1)

Parameter 16/17 in sec. or min.

Minimum on-time relays

Minimum off-time relays

0 = Cool

1 = Heat

0..99

0 = Seconds

1 = Minutes

0..99 Minutes

Network number

Software version

Production year

Production week

Serial number (x1000)

Serial number (units)

1..250

0..255

00..99

1..52

0..255

0..999

1) During delay time the LED ‘on’ is flashing.

*Adjustment sensor.

The sensor can be adjusted by using the Sensor Offset (parameter 04). Indicates

the ALFA(NET) 21 e.g. 2C too much, the Sensor Offset has to de decreased with

2C.

*Error messages.

In the display of the ALFA(NET) 21 the following error messages can appear:

Er - Sensor broken. Solution:

- Check if the sensor is connected correctly.

- Check the sensor (1000at 25C).

- 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

Range : 0/+100C, readout per 1C

Supply : 230 Vac 50/60Hz

Relay : SPDT 250V/16A(C-NO), 8A(C-NC) (cos phi=1)

Control : by push buttons on the front.

Communication : RS485-Network (2x twisted pair shielded, min. 0,75mm2)

Front : Polycarbonate

Sensor : SM 811/2m (1000at 25C)

Demensions : 144 x 72 x 50mm (hbd)

Panel hole : 139 x 67mm (hb) bij doorvoer in front

- Provided with memory protection during power failure.

- Connection with screw terminals on the back side.

- Equipped with self test function and sensor failure detection.

- Special version on request available.

*Function Diagram.

*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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