Multi F Max Refrigerant Charge Worksheet - LG LMCN077HV 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 connectable indoor units – Total number of connected indoor units
Multi F MAX Outdoor Unit Piping Specifications
Outdoor Unit Model
Chargeless Pipe Length of
LMU480HV
LMU540HV
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
+ (________D – ________L) x ________a
- ________CF x 3.53
= ________ Additional Charge (lbs.)
MULTI F MAX REFRIGERANT
CHARGE WORKSHEET
Main Piping Length
Additional Charge Needed
Main Pipe (L) (ft.)
16.4
16.4
(________)
+ (________)
+ (________)
+ (________)
+ (________)
+ (________)
+ (________)
+ (________)
+ (________)
+ (________)
- (________)
Due to our policy of continuous product innovation, some specifications may change without notification.
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Multi F MAX Outdoor Unit Factory Charge
Outdoor Unit
LMU480HV
LMU540HV
Chargeless Pipe Length
(a) (oz./ft.) per Branch Pipe (B) (ft.)
0.54
0.54
Factory Charge lbs. of R410A
9.7
9.7
Branch Piping Length
Additional Charge Needed
(b) (oz./ft.)
16.4 0.22
16.4 0.22