Multi F Max With Lgred Outdoor Unit Piping Specifications; Multi F Max With Lgred Refrigerant Charge Calculations - LG MULTI F Series Installation Manual
Multi-zone heat pump systems with lgred 1.5 to 3.5 tons
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Also See for MULTI F Series:
- Engineering manual (392 pages) ,
- Installation manual (104 pages) ,
- Owner's manual (234 pages)
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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.
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 Outdoor Unit Piping Specifications
Outdoor Unit Model
LMU360HHV
LMU420HHV
Multi F MAX with LGRED Refrigerant Charge Calculations
(________[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
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 WITH LGRED
Main Piping Length
Chargeless Pipe Length of
Main Pipe (L) (ft.)
16.4
16.4
(________)
+ (________)
+ (________)
+ (________)
+ (________)
+ (________)
+ (________)
+ (________)
+ (________)
- (________)
= ________ Additional Charge (oz.)
Additional Charge Needed
(a) (oz./ft.)
0.54
0.54
MULTI
MULTI
Multi F MAX with LGRED Outdoor Unit
Factory Charge
Outdoor Unit
Factory Charge oz. of R410A
LMU360HHV
LMU420HHV
Branch Piping Length
Chargeless Pipe Length
Additional Charge Needed
per Branch Pipe (B) (ft.)
16.4
16.4
F
WITH
F
MAX
197.5
197.5
(b) (oz./ft.)
0.22
0.22
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