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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
- 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
Min. to Max. Piping
Outdoor Unit
Length for One
Model
Branch (ft.)
LMU183HV
9.8 to 82
LMU243HV
9.8 to 82
LMU303HV
9.8 to 82
LMU363HV
9.8 to 82
Multi F Refrigerant Charge Calculations
(________[A] – 24.6) x 0.22
- ________CF x 5.29
= ________ Additional Charge (oz.)
MULTI F REFRIGERANT
CHARGE WORKSHEET
Max. Total System
Chargeless Pipe Length
Piping Length (ft.)
per Branch (L) (ft.)
164
230.0
246.1
246.1
(________)
- (________)
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
LMU183HV
LMU243HV
LMU303HV
LMU363HV
Piping Length (No Additional
Refrigerant [ft])
24.6
24.6
24.6
24.6
MULTI
MULTI
Factory Charge lbs. of R410A
3.97
3.97
6.17
6.17
Additional Charge
Needed (a) (oz./ft.)
98.4
0.22
98.4
0.22
98.4
0.22
98.4
0.22
F
F
MAX
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