LGRED Heat LMU180HHV Installation Manual

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
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
per Branch Pipe (B) (ft.)
Additional Charge Needed
(b) (oz./ft.)
LMU360HHV 16.4 0.54 16.4 0.22
LMU420HHV 16.4 0.54 16.4 0.22
Multi F MAX with LGRED Outdoor Unit Piping Specifications
Additional charge (lbs.) = (Total Main Piping Length [A] - Chargeless Pipe Length of Main Pipe [L]) x a
+ (Installed Length of Branch [B1] – Chargeless Pipe Length [B]) x b
+ (Installed Length of Branch [B2] – Chargeless Pipe Length [B]) x b
+ (Installed Length of Branch [B3] – Chargeless Pipe Length [B]) x b ...
- CF (Correction Factor) x 3.53
• 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.
Outdoor Unit Factory Charge oz. of R410A
LMU360HHV 197.5
LMU420HHV 197.5
Multi F MAX with LGRED Outdoor Unit
Factory Charge
(________[A] – 16.4) x 0.54 (________)
+ (________[B1] – 16.4) x 0.22 + (________)
+ (________[B2] – 16.4) x 0.22 + (________)
+ (________[B3] – 16.4) x 0.22 + (________)
+ (________[B4] – 16.4) x 0.22 + (________)
+ (________[B5] – 16.4) x 0.22 + (________)
+ (________[B6] – 16.4) x 0.22 + (________)
+ (________[B7] – 16.4) x 0.22 + (________)
+ (________[B8] – 16.4) x 0.22 + (________)
- ________CF x 3.53 - (________)
= ________ Additional Charge (oz.)
Multi F MAX with LGRED Refrigerant Charge Calculations