3
* 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. 0,75mm
2
)
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.
