LG MULTI V WATER MINI Engineering Manual page 35

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