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
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- CF (Correction Factor) x 5.29
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 (________)
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- ________CF x 5.29 - (________)
= ________ Additional Charge (oz.)
Multi F Refrigerant Charge Calculations
Multi F Outdoor Unit Additional Refrigerant Charge Formula
Note:
Outdoor Unit Factory Charge lbs. of R410A
LMU183HV 3.97
LMU243HV 3.97
LMU303HV 6.17
LMU363HV 6.17
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.)
LMU183HV 9.8 to 82 164 24.6 98.4 0.22
LMU243HV 9.8 to 82 230.0 24.6 98.4 0.22
LMU303HV 9.8 to 82 246.1 24.6 98.4 0.22
LMU363HV 9.8 to 82 246.1 24.6 98.4 0.22