2
ParaMETErS SETTing
LEVEL 1
:
SEt
Setpoint:
It allows to fix the setpoint that corresponds to the room temperature required.
Setting range:
6,0
...
45,0
°C
default value:
20,0
°C
PAS
Password:
access key to level 2: PAS=6.5.
access key to level 3: PAS=8.5. (only if remote sensor is used)
Setting range:
6,0
...
45,0
default value:
6,0
LEVEL 2
:
tip
Type of system
:
It defines the type of system choosen: 2 pipe o 4 pipe system. According to selection done different parameters are
then visualized.
Setting range:
2P
= 2 pipe systems
4P
= 4 pipe systems
default value:
2P
2 pipe systems operating mode
bP
Proportional band
:
The proportional band is the part of output that changes proportionally with error signal. The default setpoint is on the
center of proportional band with parameter MAr = 5.0. Changing parameter MAr it is possible to move proportional
band around the setpoint. Out of the proportional band, the output signal is always saturated at 0 V or at 10 V.
Setting range:
1,0
...
30,0
°C
default value:
5,0
°C
Output with only proportional action (without integral action)
reverse
action
direct
action
tI
integral time
:
The integral time is the speed at which a corrective increase or decrease in ouput is made to compensate for offset
which usually accompanies proportional only processes. The more integral time entered, the slower the action. The
less integral time entered, the faster the action. A too small integral time can make the system oscillating.
To exclude integral action and make the unit a proportional regulator set the value of parameter to
noi
with key +.
Setting range:
1,0
...
30,0
minutes (with integral action)
noI
(without integral action)
default value:
20,0
minutes
StA
working season
:
It defines if 0...10 V output operates in direct action (cooling) or in reverse action (heating). According to setting done
it is possible to select the working season directly on unit or to decide to choose it remotely. On this last case it is
possible to have two possibilities:
- with a remote centralized switch connected between terminals 3 and 13 (see figure 1, contact opened = cooling
mode, contact closed = heating mode)
- with water sensor (buying code NTA020-027P) connected between terminals 13 and 14 and mounted upstream
the valve (see figure 2).
Setting range:
H
-> heating
Water temp.
Cooling mode
Heating mode
C
-> cooling
rem
-> remote selection
default value:
H
