81
Final Installation Procedures
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MULTI
F
MAX
MULTI
F
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Multi F MAX Systems
Table 36:
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• Number of installed length of branches depends on system specifications.
• CF = Maximum number of connectible indoor units – Total number of connected indoor units
Figure 101: Multi F MAX Additional Refrigerant Charge Example.
FINAL INSTALLATION PROCEDURES
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.)
LMU480HV
16.4
0.54
16.4
0.22
LMU540HV
16.4
0.54
16.4
0.22
LMU600HV
16.4
0.54
16.4
0.22
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
B3
18,000
9,000
9,000
LMU420HV
• 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