Engineering manual - UniSAB III 1.10.8
001930 en 2021.06
181/346
Set-up
Hot water temperature is measured by a Pt 100 sensor in the water output of the condenser. Set point
is set in the picture Control values/ Process temp./Process out temp./Control.
Ext. cool At this stage it is possible to connect an external 4-20 mA transducer as cooling function, i.e.
at a rising signal the compressor will load capacity. Additionally, set Function to Ext.inp.signal in picture
Setup/Configuration/External input. The points 4 mA and 20 mA must be set as minimum (4 mA) and
maximum (20 mA) values of the sensor. Select Control values/User/User Input 1/Control and enter regu-
lator set point, neutral zone and prop. band. See also section 3.1.1 Control mode set-up.
Ext. heat At this stage it is possible to connect an external 4-20 mA transducer as heating function, i.e.
at a falling signal the compressor will load capacity. Additionally, set Function to Ext.inp.signal in picture
Setup/Configuration/External input. The points 4 mA and 20 mA must be set as maximum (20 mA) and
minimum (4 mA) values of the sensor. Select Control values/ User/User Input 1/Control and enter regu-
lator set point, neutral zone and prop. band. See also 3.1.1 Control mode set-up.
3: Capacity controller
I
PID
Select PID for special applications where a change in the cooling requirement must be met by a fast
change in capacity. Select I for normal refrigeration plants. See also section 3.1.1 Control mode set-up.
4: Auto start
No
Yes
If selecting Yes, the compressor will start by itself in Auto/Remote depending on what is required. Regu-
lation is now automatic. If selecting No, the compressor must be started manually even though it is in
Auto/Remote. During operation the compressor regulates automatically.
5: Auto stop
No
Yes
If selecting Yes, the compressor will stop automatically at minimum capacity by decreasing demand. If
selecting No, the compressor must be stopped manually even if Auto or Remote has been selected in
Setup/Compr. Control, Mode.
6: Cold store
No
Yes
Choosing this function affects the way the Multisab system starts and regulates the compressors in a
common system. See detailed description in section 3.5 Compressor control - user functions.
7: Climate compensation
No
Yes
If the compressor is used for water/brine cooling or water heating, the flow temperature can be raised or
reduced depending on the outside temperature. An extra 4-20 mA temperature transducer must be con-
nected. See detailed description in subsection 3.1.13 Climate compensation.
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