LG MULTI V WATER MINI Engineering Manual page 45

Freeze Protection
The piping system must be protected from freezing during winter conditions. Heating mode of the water cooled unit will reduce water loop
temperature and methods must be taken to prevent freezing of the loop water. If entering water temperature falls below 42°F, glycol must be
added to the system. Use of ethylene glycol, propylene glycol, or methanol is acceptable. Manufacturers recommended levels of concentra-
tion must be followed, however, the addition of antifreeze may lower the performance of the water cooled unit due to reduced heat transfer
and added pressure drop.
1. Find the corresponding correction factor from table below.
2. Multiply by the water cooled unit capacity to find the net water cooled unit capacity.
3. Apply the corresponding pressure drop correction factor from table below, and multiply by the water cooled unit pressure drop to find the
net water cooled unit pressure drop.
Table 23: Antifreeze Correction Factors.
Antifreeze Type
Methanol
Pressure Drop
Ethylene Glycol
Pressure Drop
Propylene Glycol
Pressure Drop
If entering water temperature falls below 42°F, glycol must be added to the system.
Figure 19: Cooling Capacity Correction Factor Chart.
1.000
0.990
0.980
0.970
0.960
0.950
Methanol
0.940
Ethylene glycol
Prlpylene glycol
0.930
0% 10%
WATER CIRCUIT INSTALLATION
Item
10%
Cooling 0.998
Heating 0.995
1.023
Cooling
0.996
Heating
0.993
1.024
Cooling 0.993
Heating
0.986
1.040
20% 30% 40%
Antifreeze % by wt
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. "LG" is a registered trademark of LG Corp.
Piping System Specifications
Antifreeze % by Weight
20% 30%
0.997 0.995
0.99 0.995
1.057 1.091
0.991 0.987
0.985 0.997
1.068 1.124
0.987 0.98
0.973 0.96
1.098 1.174
Figure 20: Heating Capacity Correction Factor Chart.
1.000
0.990
0.980
0.970
0.960
0.950
Methanol
0.940
Ethylene glycol
Prlpylene glycol
0.930
0% 10%
50%
40% 50%
0.993 0.992
0.979 0.974
1.122 1.160
0.983 0.979
0.969 0.961
1.188 1.263
0.974 0.968
0.948 0.935
1.273 1.405
20% 30% 40%
Antifreeze % by wt
WATER CIRCUIT | 45
50%