1-20
Max. No. of combined outdoor units
5 units
Max. capacity of combined outdoor units 46 HP
Max. No. of connected indoor units
40 units
H
2
<15
135%
Max. capacity of combined
indoor units
H
2
>15
105%
Note 1)
Note 2)
Note 3)
Note 4)
Combination of outdoor units : Inverter unit (1 unit) + Fixed-speed unit (0 to 4 units)
Combination of Fixed-speed units alone (without inverter unit) is unavailable.
Inverter unit is used for leading outdoor unit which is connected to indoor crossover pipe.
Install the outdoor units in order of capacity.
(Inverter unit > Fixed-speed unit 1 > Fixed-speed unit 2 > Fixed-speed unit n)
Allowable value
Piping section
Total extension of pipe (Liquid pipe, real length)
250 m
LA + LB + La + Lb + Lc + Ld + L1 + L2 + L3 + L4+
L5 + L6 + L7 + a + b + c + d + e + f + g + h + i + j
Real length
100 m
Farthest piping length L (
*
)
Equivalent length
125 m
LA + LB + Ld + L1 + L3 + L4 + L5 + L6 + j
Equivalent length of farthest piping from 1st branching Li (
*
)
50 m
L3 + L4 + L5 + L6 + j
Equivalent length of farthest piping between outdoor units LO (
*
)
20 m
LA + LB + Ld, LA + Lb, LA + LB + Lc
Max. real length of main piping
50 m
L1
Piping
length
Max. equivalent length of outdoor unit connecting piping
10 m
Ld, La, Lb, Lc
Upper outdoor unit
50 m
——
Height between indoor
and outdoor units H1
Lower outdoor unit
30 m
——
Height between indoor units H2
30 m
——
Height
difference
Height between outdoor units H3
4 m
——
NOTE :
In case of connecting method <Ex. 2>, a large amount of
refrigerant and refrigerant oil may return to the inverter unit.
Therefore, set the T-shape joint so that oil does not enter directly.
Outdoor unit
T-shape branching
joint
La
LA
LB
Lb
Lc
Main
piping
L1
1st branching
section
Height
difference
between
outdoor
units
H3 4 m
Height
difference
between
outdoor
units
H1 50 m
Fixed-speed
unit n
Connecting
piping of
outdoor unit
Fixed-
speed
unit 1
Fixed-
speed
unit 2
Inverter
unit
Main connecting piping between outdoor units
Length corresponded to farthest piping
between outdoor units LO 20 m
Branching piping L2
Connecting piping of indoor unit
L7
b
c
d
e
a
g
h
i
j
f
L4
L5
L6
L3
Branching
header
Indoor unit
Indoor unit
Length corresponded to farthest piping L 125 m
Length corresponded to farthest piping after 1st branching Li 50 m
Y-joint
Height difference
between indoor
units
H2 30 m
<Ex. 2>
<Ex. 1>
Ld
(a)
(d)
(b)
(c)
Fixed-
speed
unit 1
Fixed-
speed
unit 2
Inverter
unit
Fixed-
speed
unit 1
Fixed-
speed
unit 2
Inverter
unit
2. Allowable length/height difference of refrigerant piping
• System restrictions
• Allowable length and height difference of refrigerant piping
*
(d) is outdoor unit farthest from 1st branching, and ( j ) is indoor unit farthest from 1st branching.
