4
ui5 = “ Li” -> liquid sensor visualized (temperature can be visualized up to a value around 75°C. If water temperatu-
re sensor is upper 75°C the message “97.0” is visualized)
4 pipe systems operating mode
bPH
Proportional heating band
:
The proportional heating band is the part of heating output that changes proportionally with error signal. The setpoint
is at the beginning of the proportional heating band.
Setting range:
1,0
...
30,0
°C
default value:
5,0
°C
bPC
Proportional cooling band
:
The proportional cooling band is the part of cooling output that changes proportionally with error signal. The setpoint
for cooling is the setpoint added to neutral zone and is at the beginning of the proportional cooling band.
Setting range:
1,0
...
30,0
°C
default value:
5,0
°C
Output with only proportional action
(without integral 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
dEZ
Dead zone
:
It defines the dead zone between heat and cool where there is not any regulation (only for proportional action)
Setting range:
0,5
...
4,0
°C
default value:
1,0
°C
COr
Correction of temperature
:
It allows to add a value to the measured temperature to increase precision (let the unit switch on for 45 minutes before
setting the parameter when the internal sensor is used)
Setting range:
-5,0
...
5,0
°C
default value:
0,0
°C
PoE
Method of regulation
:
It defines if unit operates with PI or P regulation or if the unit operates in manual test mode
for doing some
test on the system to regulate in open loop mode. This type of test can be used only if one has a measuring system
for temperature. In order to see how to use this parameter see APPENDIX 2, page 9, method 3.
Setting range:
0
...
10,0
V
-> manual operating
Pi
->
proportional integral regulation
default value:
Pi
ofS
Offset for economy function
:
It allows the change of setpoint position for economy function. The unit works with main setpoint if the contact ECO
connected between terminals 3 and 12 is open. If contact is closed, the unit works with modified setpoint and increased
neutral zone. See diagram below for more details.
Setting range:
0
...
5,0
°C
default value:
5,0
°C
