LG Multi F Series Installation Manual page 102

LG Multi F outdoor units ship from the factory with a charge of R410A refrigerant. A
trim charge will need to be added to take into account additional piping length.
To determine the additional refrigerant that is needed, apply the formula 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.
Multi F Outdoor Unit Additional Refrigerant Charge Formula
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
Note:
• 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.
Multi F Outdoor Unit Piping Specifications
Multi F Outdoor Unit Min. to Max. Piping Length
Model
LMU18CHV
LMU24CHV
LMU30CHV
LMU36CHV
Multi F Refrigerant Charge Calculations
(________[A] – 24.6) x 0.22
+ (________[B] – 24.6) x 0.22
+ (________[C] – 24.6) x 0.22
+ (________[D] – 24.6) x 0.22
- ________CF x 5.29
= ________ Additional Charge (oz.)
MULTI F REFRIGERANT
CHARGE WORKSHEET
Max. Total System Piping
for One Branch (ft.)
10 to 82
10 to 82
10 to 82
10 to 82
(________)
+ (________)
+ (________)
+ (________)
- (________)
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 Outdoor Unit Factory Charge
Outdoor Unit
LMU18CHV
LMU24CHV
LMU30CHV
LMU36CHV
Chargeless Pipe Length
Length (ft.) per Branch (L) (ft.)
164
246.1
246.1
246.1
MULTI
MULTI
Factory Charge lbs. of R410A
3.96
3.96
6.18
6.18
Additional Charge Needed
(a) (oz./ft.)
24.6 0.22
24.6 0.22
24.6 0.22
24.6 0.22
F
F
MAX