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. 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
01
02
03
04
Switching differential
Minimum setpoint
Maximum setpoint
Offset temperature sensor
1..30
C
0..+100
C
0..+100
C
-15..+15
C
3
0
+100
0
10
11
Startup delay after power failure
Relays on at sensor failure
0..99 Minutes
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 = Seconds
1 = Minutes
0..99 Minutes
0..99 Minutes
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
-
-
-
-
-
1) During delay time the LED ‘on’ is flashing.
