VDH Products ALFA 11 User manual

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User manual
ALFA 11 +50/+150C
Cool/Heat Thermostat.
VDH doc: 072375 Version: v1.0 Date: 16-10-2007
Software: ALFA 11 +50..+150 File: DO072375.WPD Range: +50/+150C per 1C
*Function.
The ALFA 11 is a digital thermostat for panel mounting. The function from the
thermostat can be programmed for cooling or heating.
*Installation.
On the topside of the ALFA 11 is shown how the sensor, power supply and relay
have to be connected.
After connecting the ALFA 11 to the power supply, a self-test function is started. As
this test is finished the measured temperature appears in the display.
When the relayis activated, the led 'on' will light-up in the display.
*Control.
The ALFA 11 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 fewseconds afterreleasing the SET keythe set point disappears and the
measured temperature is shown in the display.

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*Changing set point.
Push the SET key and the set point appears in the display. Release the at SET key.
Now push the SET key again and together with the UP or DOWN keys the set point
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 set point, some internal settings are possible like
differential, sensor-offset, set point 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 11 changes to it's normal operation
mode.
*Adjustment sensor.
The sensor can be adjusted by using the Sensor Offset (parameter 04). Indicates
the ALFA 11 e.g. 2C too much, the Sensor Offset has to de decreased with 2C.
*Error messages.
In the display of the ALFA 11 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.

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*Technical details.
Model : ALFA 11 Cool/Heat Thermostat
Range : +50/+150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.
Front : Polycarbonate
Sensor : SM 811/2m (1000at 25C)
Sizes : 90 x 53 x 58mm (hwd)
Panel hole : 46 x 53mm (hw)
- 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.
*Parameters ALFA 11.
PARA-
METER DESCRIPTION PARAMETER RANGE STANDARD VALUE
01
02
03
04
Switching differential
Minimum setpoint
Maximum setpoint
Offset temperature sensor
1..15C
+50..+150C
+50..+150C
-15..+15C
3
+50
+150
0
10
11 Startup delay after power failure Relays on at sensor failure 0..99 min. 0 = No
1 = Yes
0
0
15
16
17
18
19
20
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..99
0 = sec.
1 = min.
0..99 min.
0..99 min.
0
0
0
0
0
0
90
95
96
97
98
99
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
-
-
-
-
-
* Function diagram.

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*Dimensions. *Connections.
*Address.
VDH Products BV Tel: [phone]
Produktieweg 1 Fax: [phone]
9301 ZS Roden Email: [e-mail]
The Netherlands Internet: www.vdhproducts.nl