LG Multi F MAX LMU480HV - Page 46

46
MULTI F / MULTI F MAX Outdoor Unit Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
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MULTI
F
MAX
MULTI
F
Refrigerant Charge
Multi F MAX Systems
Outdoor Unit Model
Main Piping Length Branch Piping Length
Chargeless Pipe Length
of Main Pipe (L) (ft.)
Additional Charge Need-
ed (a) (oz./ft.)
Chargeless Pipe Length
per Branch Pipe (B) (ft.)
Additional Charge Need-
ed (b) (oz./ft.)
LMU480HV 16.4 0.54 16.4 0.22
LMU540HV 16.4 0.54 16.4 0.22
Table 36: 0XOWL)0$;2XWGRRU8QLW3LSLQJ6SHFL¿FDWLRQV
$GGLWLRQDOFKDUJHOEV 7RWDO0DLQ3LSLQJ/HQJWK>$@&KDUJHOHVV3LSH/HQJWKRI0DLQ3LSH>/@[D
 ,QVWDOOHG/HQJWKRI%UDQFK>%@±&KDUJHOHVV3LSH/HQJWK>%@[E
 ,QVWDOOHG/HQJWKRI%UDQFK>%@±&KDUJHOHVV3LSH/HQJWK>%@[E
 ,QVWDOOHG/HQJWKRI%UDQFK>%@±&KDUJHOHVV3LSH/HQJWK>%@[E
- CF (Correction Factor) x 3.53
• Number of installed length of branches depends on system specifications.
• &) 0D[LPXPQXPEHURIFRQQHFWLEOHLQGRRUXQLWV±7RWDOQXPEHURIFRQQHFWHGLQGRRUXQLWV
Figure 58: Multi F MAX Additional Refrigerant Charge Example.
B3
18,000 9,000 9,000
LMU540HV
• Total main pipe (A) = 60 ft.
• Each branch pipe
B1 =
B2 =
B3 =
B4 =
B5 =
Additional Charge
= (60 - 16.4) x 0.54
+ (49 - 16.4) x 0.22
+ (17 - 16.4) x 0.22
+ (17 - 16.4) x 0.22
+ (10 - 16.4) x 0.22
+ (23 - 16.4) x 0.22
– (8 - 5) x 3.53
= 20.43 oz.
A
49 ft.
17 ft.
17 ft.
10 ft.
23 ft.
BD Unit
BD Unit
9,000 18,000
A
A
B1 B2
B4 B5
REFRIGERANT PIPING PREPARATION