No. Type of regulator Minimum Maximum
Factory
setting
Unit
2 Normal oil cooling
Set point 1/oil temperature
Hysteresis
35 75 50
5 (fixed)
°C
°C
3 HLI/BLI cooling
Set point 1/discharge pipe temperature
Hysteresis
-20 150 65
2 (fixed)
°C
°C
5 3-way valve
Set point 1/oil temperature
Neutral zone
Prop. band oil cooling
35
0
0
75
100
100
50
4
4
°C
°C
°C
6 HLI-AKV oil cooling
Set point 1/discharge pipe temperature
Neutral zone
Prop. band
-20
0
1
150
10
100
65
0
10
°C
°C
°C
7 HLI 4-20 mA oil cooling
Set point 1/discharge pipe temp.
Neutral zone
Prop. band
T.int.
T.diff.
40
0
1
1
0
80
10
100
999
999.9
65
0
30
10
0
°C
°C
°C
sec.
sec.
8 Thermo pump internal
Set point 1/discharge pipe temperature 70 90 80 °C
Table 45: Oil cooling setting - screw compressors
4: Oil controller
I
PID
Select PID for applications where a change in the cooling requirement must be met by a fast
change in cooling capacity. PID is selected as standard.
5: Water cooling (reciprocating compressors)
No
Yes
Water cooling output is activated by rising discharge pipe temperature. The set point for this
value is set in Disch. Temp/Parameter, Set point 1. The set point has a fixed hysteresis of 5K.
Example:
Sp 1 = 100°C:
Cooling starts at 100°C and stops at (100-5) = 95°C.
Water cooling output is closed at compressor stop according to adjustable time delay. In
Timers/Timer setup adjust time delay Oil cool on.
Intermediate pressure liquid injection (Two stage reciprocating compressors)
The intermediate pressure liquid injection for TSMC/TCMO compressors is active whenever the
compressor is configured to TCMO or TSMC. The solenoid valve for intermediate pressure liq-
uid injection is activated when the compressor has started and the discharge pipe tempera-
ture gets too high. The set point for this value is entered in Control values/Discharge/Temper-
ature/Control, Set point 2. The set point has a fixed hysteresis of 5°K.
Set-up
Engineering manual - Unisab III 1.10
001930 en 2014.09
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