27
Installation
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AHU COMMUNICATIONS KIT INSTALLATION
Main Module Settings
ODU capacity control #1 is available when DIP SW2-1 is Off. Each Master ODU has a different
operating ratio as shown in the table below.
Main Module
2 System
1 System
Note :
1. ODU Capacity ratios mentioned in the table above are not exact.
2. Evaporative temperature / Condenser temperature may vary depending on system operating frequency,
pressure option setting and piping installationconditions.
3. The evaporator temperature is based on target low pressure of compressor. The actual temperature at
the evaporator may vary by pressure drop. Please contact your LG representative to design an AHU
heat exchanger.
Voltage
[V]
Total
Capacity
ratio [%]
Each ODU’s capacity
ratio [%]
ODUMaster#1 ODUMaster#2
<2.0
0
Operation Off
2.0
20.0
40
0
2.5
25.0
50
0
3.0
30.0
60
0
3.5
35.0
70
0
4.0
40.0
40
40
4.5
45.0
40
50
5.0
50.0
50
50
5.5
55.0
50
60
6.0
60.0
60
60
6.5
65.0
60
70
7.0
70.0
70
70
7.5
75.0
70
80
8.0
80.0
80
80
8.5
85.0
80
90
9.0
90.0
90
90
9.5
95.0
90
100
10.0
100.0
100
100
Voltage [V]
ODU
Capacity
ratio [%]
Evaporator (Te)
Condenser (Tc)
V Min. Max.
Temperature Low pressure Temperature High pressure
<4.0
-
3.7 Operation Off
-
-
-
-
4.0 3.8 4.2
40
59.0
168.2
86.0
261.1
4.5 4.3 4.7
40
59.0
168.2
86.0
261.1
5.0 4.8 5.2
50
55.4
155.2
96.8
301.7
5.5 5.3 5.7
50
55.4
155.2
96.8
301.7
6.0 5.8 6.2
60
50.0
143.6
104.0
339.4
6.5 6.3 6.7
60
50.0
143.6
104.0
339.4
7.0 6.8 6.2
70
46.4
134.9
111.2
371.3
7.5 7.3 7.7
70
46.4
134.9
111.2
371.3
8.0 7.8 8.2
80
43.7
126.2
116.6
396.0
8.5 8.3 8.7
80
43.7
126.2
116.6
396.0
9.0 8.8 9.2
90
41.0
120.4
120.2
433.7
9.5 9.3 9.7
90
41.0
120.4
120.2
433.7
10.0 9.8 10.0
100
39.2
116
122.0
435.1
°F
°F
psi
psi
UI7 (Analog Input)
–
ODU Capacity Control #1
