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.
PERFORMANCE DATA | 35
Performance Data
The correction factor shown below is calculated in the LATS software programs.
CORRECTION FACTORS
L1
L2
L3
a
b
c
d
1 WAY
2 WAY
4 WAY
4 WAY
Additional Refrigerant Charge for Piping Length
Calculations for additional refrigerant charge must take into account piping length.
Product Charge (lbs.)
Additional Charge (lbs.) =
+
+
+
Length (ft.) of Ø3/8-inch Liquid Pipe
Total Charge (lbs.) =
Piping
Section
Piping
Dia.
(in.)
Piping
Length
(ft.)
Piping
Section
Piping
Dia.
(in.)
Piping
Length
(ft.)
L1
Ø3/8
30
a
Ø3/8
9
L2
Ø3/8
30
b
Ø1/4
9
L3
Ø3/8
15
c
Ø1/4
12
d
Ø1/4
15
Additional Refrigerant Charge Amount R (lbs.)
= (L
x
x 0.015 [lbs. / ft.]) + (L
y
x 0.041 [lbs. / ft.]) + Water Source Unit Correction Indoor Unit Correction Factor
= (36 x 0.015 [lbs. / ft.]) + (84 x 0.041 [lbs. / ft.]) + 0 + 0.33 + 0.35 + 0.40 + 1.06
= 6.124
L
x
: Actual Total Length of Liquid Piping Ø1/4 (ft.)
L
y
: Actual Total Length of Liquid Piping Ø3/8 (ft.)
If the result is a negative number, refrigerant does not need
to be added.
x 0.041 (lbs./ft.)
Length (ft.) of Ø1/4-inch Liquid Pipe x 0.015 (lbs./ft.)
Correction Factor of Water Source Unit
Correction Factor of Indoor Unit(s)
Product Charge (lbs.) + Additional Charge (lbs.)
Example: Four-Ton Water Source Unit�
Table 17: Refrigerant Charge Example.
Water Source Unit
Indoor Unit
Maximum
Quantity
Sum of Indoor Unit Nominal Cooling Capacities (Btu/h)
Model
Nominal Cooling (Btu/h)
Minimum Capacity (Btu/h) (30%)
1
Maximum Capacity (Btu/h) (130%)
2
ARWN053GA2
52,900
9
15,870
68,770
1
30% = Minimum Combination Ratio.
2
130% = Maximum Combination Ratio.
Table 18: Published Operating Temperature Ranges for LG Multi Water Mini Units.
1
Table 19: Multi V Water Mini Indoor Unit Matching Limitations.
Operating Temperature Ranges
1
Equivalent pipe length distance between water source and indoor units is 25 feet and no elevation difference between water source and
indoor units.
2
Variable water flow control kit (PRVC1) is required for all entering water temperatures (one kit per frame). If entering water temperatures fall below 42°F,
glycol must be added to the system.
Operation
Cooling (°F DB)
2
Heating (°F WB)
2
Entering Water Temperature
23 – 113
23 – 113
Water Source Unit / Indoor Unit Matching Limitations