LGRED Installation Manual

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MULTI
F
MAX
MULTI
F
WITH
Multi F MAX with LGRED Outdoor Unit Piping Specifications
• Number of installed length of branches depends on system specifications.
• CF = Maximum number of connectible indoor units – Total number of connected indoor units
MULTI F MAX WITH LGRED
REFRIGERANT CHARGE WORKSHEET
LG Multi F MAX 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.
Multi F MAX with LGRED Outdoor Unit
Factory Charge
(________[A] – 49.2) x 0.54 (________)
+ (________[B1+B2+B3...] – 131.2) x 0.22 + (________)
- ________CF x 3.53 - (________)
= ________ Additional Charge (oz.)
Multi F MAX with LGRED Refrigerant Charge Calculations
Outdoor Unit Model
Main Piping Length Branch Piping Length
Chargeless Pipe Length
of Main Pipe (L) (ft.)
Additional Charge
Needed (a) (oz./ft.)
Chargeless Pipe Length
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Additional Charge
Needed (b) (oz./ft.)
LMU361HHV 49.2 0.54 131.2 0.22
LMU421HHV 49.2 0.54 131.2 0.22
LMU480HHV 49.2 0.54 131.2 0.22
Outdoor Unit Factory Charge oz. of R410A
LMU361HHV 183.4
LMU421HHV 183.4
LMU480HHV 183.4
Additional charge (lbs.) = (Total Main Piping Length [A] - Chargeless Pipe Length of Main Pipe [L]) x a
+ (Total Installed Length of Branch [B1+B2+B3...] – Chargeless Branch Length [B]) x b
- CF (Correction Factor) x 3.53