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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
WITH
MULTI F WITH LGRED
REFRIGERANT CHARGE WORKSHEET
LG Multi F with LGRED outdoor units ship from the factory with a charge of R410A
refrigerant. A trim charge may 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.
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
Multi F 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.)
Additional Charge Needed
(a) (oz./ft.)
LMU180HHV 9.8 to 82 164 24.6 0.22
LMU240HHV 9.8 to 82 246.1 24.6 0.22
LMU300HHV 9.8 to 82 246.1 24.6 0.22
Outdoor Unit Factory Charge oz. of R410A
LMU180HHV 98.8
LMU240HHV 112.8
LMU300HHV 112.8
Multi F with LGRED Outdoor Unit Factory
Charge
• 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 with LGRED Outdoor Unit Piping Specifications
(________[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 with LGRED Refrigerant Charge Calculations
Multi F with LGRED Outdoor Unit Additional Refrigerant Charge Formula
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