Multi F Outdoor Condenser Installation Manual

MULTI
F
MAX
MULTI
F
Due to our policy of continuous product innovation, some specifications may change without notification.
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MULTI F REFRIGERANT
CHARGE WORKSHEET
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.
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.)
LMU18CHV 10 to 82 164 24.6 0.22
LMU24CHV 10 to 82 246.1 24.6 0.22
LMU30CHV 10 to 82 246.1 24.6 0.22
LMU36CHV 10 to 82 246.1 24.6 0.22
Outdoor Unit Factory Charge lbs. of R410A
LMU18CHV 3.96
LMU24CHV 3.96
LMU30CHV 6.18
LMU36CHV 6.18
Multi F 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 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 Refrigerant Charge Calculations
Multi F Outdoor Unit Additional Refrigerant Charge Formula
Note: