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MULTI F / MULTI F MAX Outdoor Unit Installation Manual
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.
MULTI
F
MAX
MULTI
F
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LG Multi F and Multi F MAX outdoor units ship from the factory with a charge of
R410A refrigerant. A trim charge will need to be added to take into account addition-
al piping length.
To determine the additional refrigerant that is needed, apply the formulas below,
and record the results. If the total additional refrigerant charge value is a negative
number, then an additional trim charge does not need to be added to the system.
Table 34: Outdoor Unit Factory Charge.
Multi F Systems
• Number of installed length of branches depends on the specifications of the outdoor unit model.
• CF = Maximum number of connectible indoor units – Total number of connected indoor units.
Table 35: 0XOWL)2XWGRRU8QLW3LSLQJ6SHFL¿FDWLRQV
Figure 100: Multi F Additional Refrigerant Charge Example.
FINAL INSTALLATION PROCEDURES
Additional charge (lbs.) = (Installed Length of Branch [A] – Chargeless Pipe Length [L]) x a
+ (Installed Length of Branch [B] – Chargeless Pipe Length [L]) x a
+ (Installed Length of Branch [C] – Chargeless Pipe Length [L]) x a
+ (Installed Length of Branch [D] – Chargeless Pipe Length [L]) x a
- CF (Correction Factor) x 5.29
Outdoor
Unit Model
Min. to Max. Piping
Length for One
Branch (ft.)
Max. Total System
Piping Length (ft.)
Chargeless Pipe Length
per Branch (L) (ft.)
Piping Length (No Additional
Refrigerant [ft])
Additional Charge
Needed (a) (oz./ft.)
LMU18CHV 9.8 to 82 164 24.6 49.2 0.22
LMU24CHV 9.8 to 82 246.1 24.6 73.8 0.22
LMU30CHV 9.8 to 82 246.1 24.6 98.4 0.22
LMU36CHV 9.8 to 82 246.1 24.6 98.4 0.22
Outdoor Unit
Factory Charge
lbs. of R410A
LMU18CHV 3.96
LMU24CHV 3.96
LMU30CHV 6.18
LMU36CHV 6.18
LMU480HV 9.7
LMU540HV 9.7
LMU600HV 12.3
Each branch pipe
A = 82 ft.
B = 16 ft.
C = 49 ft.
Additional Charge
A
B
C
9,000
9,000
9,000
Example: LMU36CHV
= (82 - 24.6) x 0.22
+ (16 - 24.6) x 0.22
+ (49 - 24.6) x 0.22
- (4 - 3) x 5.29
= 10.82 oz.
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