Multi F Max Refrigerant Charge Worksheet - LG MULTI F Installation Manual

F
MULTI
F
MAX
MULTI
LG Multi F MAX outdoor units ship from the factory with a charge of R410A refrig-
erant. 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
Note:
• 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 Outdoor Unit Piping Specifications
Outdoor Unit Model Chargeless Pipe Length of
LMU480HV
LMU540HV
LMU600HV
Multi F MAX 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
MULTI F MAX REFRIGERANT
CHARGE WORKSHEET
Main Piping Length
Additional Charge Needed
Main Pipe (L) (ft.)
16.4
16.4
16.4
(________)
+ (________)
+ (________)
+ (________)
+ (________)
+ (________)
+ (________)
+ (________)
+ (________)
- (________)
= ________ Additional Charge (lbs.)
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 Outdoor Unit Factory Charge
Outdoor Unit
LMU480HV
LMU540HV
LMU600HV
Chargeless Pipe Length
(a) (oz./ft.) per Branch Pipe (B) (ft.)
0.54
0.54
0.54
Factory Charge lbs. of R410A
9.7
9.7
12.3
Branch Piping Length
Additional Charge Needed
(b) (oz./ft.)
16.4 0.22
16.4 0.22
16.4 0.22