46
P5417009-rev.6
a
b
c
A
A
B
Indoor
Unit
Indoor
Unit
First Branch
Multi-Kit
Example1) If a Line Branch Including Main Branch
Outdoor
Unit
Indoor
Unit
Indoor
Unit
e f
d
g
h
A
B
A
Outdoor
Unit
Outdoor
Unit
B
First Branch
Multi-Kit
Example 2) If Utilizing a Piping Connection Kit
Piping Connection Kit
Item
Mark
Details
Total
Piping Length
Ex1 a+b+c
The total amount of all piping actual length.
Ex2 d+e+f+g+h
Maximum
Piping Length
Ex1 a+c
The actual pipe length between the stop valve of the outdoor unit or
the piping connection kit 1 and the terminal indoor unit.
Ex2 f+h
Piping Length
-
The actual length of pipe that takes no account for equivalent lengths
for pressure drops of elbows.
Equivalent
Piping Length
-
The combination of the straight pipe length plus the equivalent length
of elbows and other pressure drop calculations.
● Piping Work Conditions
Item
Mark
Allowable Piping Length
< the recommended
number of connected
indoor units
> the recommended
number of connected
indoor units
Total Piping Length
-
< 3,281 ft (1,000m)
< 984 ft (300m)
Maximum Piping Length
Actual Length
L1
< 541 ft (165m)
< 541 ft (165m)
Equivalent Length
< 623 ft (190m)
< 623 ft (190m)
Maximum Piping Length between
Multi-kit of 1st Branch and Each Indoor Unit
L2
< 295 ft (90m)
< 131 ft (40m)
Maximum Piping Length between
Each Multi-kit/Change-Over Box (Multiple Branch Type)
and Each Indoor Unit
L3
13
< 131 ft (40m)
< 98 ft (30m)
Total Piping Length between Change-Over Box and
Each Indoor Unit per Branch
e+f+g+h+i
< 131 ft (40m)
< 98 ft (30m)
Piping Length between Piping Connection Kit 1 and
Each Outdoor Unit
La, Lb, Lc
< 32 ft (10m)
< 32 ft (10m)
Height Difference between
Outdoor Units and Indoor Units
O.U. is Higher
H1
< 164 ft
(360 ft
(50m)
(110m))
10
< 164 ft
(360 ft
(50m)
(110m))
10
O.U. is Lower
< 131 ft
(360 ft
(40m)
(110m))
11
< 131 ft
(360 ft
(40m)
(110m))
11
Height Difference between Indoor Units
H2
< 49 ft (15m)
< 49 ft (15m)
Height Difference between Indoor Units Connected to
Same Branch of Change-Over Box
H3
< 13 ft (4m)
< 13 ft (4m)
Height Difference between Change-Over Box
H4
< 49 ft (15m)
< 49 ft (15m)
Height Difference between Outdoor Units
H5
< 0.3 ft (0.1m)
< 0.3 ft (0.1m)
Height Difference between Change-Over Box and
Indoor Unit
H6
See Notice 12 below
See Notice 12 below
