En-11
• Do not install directly on the ground, this may result in equipment
failure.
2” (5 cm) or over
CAUTION
In areas with heavy snowfall , where intake and outlet of the outdoor unit can become blocked
by snow.
It is recommended that unit be installed under a canopy or elevated on a high stand.
Failure to do so will result in poor heating performance and/or premature failure of equipment.
SYSTEM CONFIGURATION
41
Piping limitation and Pipe size
41 11
H1
a
Outdoor
Unit
b
c
d
e
Branch Box
f
h
g
i
k
j
l
m
H2
H3
H4
Indoor
Unit1
Indoor
Unit2
Branch Box
Branch Box
Separation Tube
(Primary)
(Secondary1)
(Secondary2)
Indoor
Unit3
Indoor
Unit4
Indoor
Unit5
Indoor
Unit6
Indoor
Unit7
Indoor
Unit8
Limitation
m (ft)
Diagram
A
llo
w
ab
le
p
ip
e
le
ng
th
(a
ct
ua
l p
ip
e
le
ng
th
)
Maximum total equivalent pipe length
Total
Between outdoor unit and the farthest indoor unit
a + b + c + m
Between outdoor unit and branch boxes
a + b + c + d + e
Between branch box and indoor unit
Total
f + g + h + i + j + k + l + m
Each unit
f, g, h, i, j, k, l, m
Between outdoor unit and the first separation tube
Between outdoor unit and branch box (when there is no separation tube
㧕
a
A
llo
w
ab
le
he
ig
ht
di
ffe
re
nc
e
Between outdoor unit and indoor unit
H1
Between outdoor unit and branch box
H2
Between branch box and branch box
H3
Between indoor unit and indoor unit
115 or less (377)
70 or less (230)
55 or less (180)
60 or less (197)
Between 3-15 (10-49)
5 or more (16)
30 or less (98)
30 or less (98)
15 or less (49)
15 or less (49)
5 or more (16)
H4
a+d
Pipe limitation
H1
a
Outdoor
Unit
b
c
d
e
Branch Box
f
h
g
i
k
j
l
m
H2
H3
H4
Indoor
Unit1
Indoor
Unit2
Branch Box
Branch Box
Separation Tube
(Primary)
(Secondary1)
(Secondary2)
Indoor
Unit3
Indoor
Unit4
Indoor
Unit5
Indoor
Unit6
Indoor
Unit7
Indoor
Unit8
Limitation
m (ft)
Diagram
A
llo
w
ab
le
p
ip
e
le
ng
th
(a
ct
ua
l p
ip
e
le
ng
th
)
Maximum total equivalent pipe length
Total
Between outdoor unit and the farthest indoor unit
a + b + c + m
Between outdoor unit and branch boxes
a + b + c + d + e
Between branch box and indoor unit
Total
f + g + h + i + j + k + l + m
Each unit
f, g, h, i, j, k, l, m
Between outdoor unit and the first separation tube
Between outdoor unit and branch box (when there is no separation tube
㧕
a
A
llo
w
ab
le
he
ig
ht
di
ffe
re
nc
e
Between outdoor unit and indoor unit
H1
Between outdoor unit and branch box
H2
Between branch box and branch box
H3
Between indoor unit and indoor unit
115 or less (377)
70 or less (230)
55 or less (180)
60 or less (197)
Between 3-15 (10-49)
5 or more (16)
30 or less (98)
30 or less (98)
15 or less (49)
15 or less (49)
5 or more (16)
H4
a+d
Pipe size selection
Liquid pipe
(mm(in.))
䇭䇭䇭䇭䇭
a
䇭
―
䇭䇭䇭䇭䇭䇭䇭
Φ15.88 (5/8)
Φ9.52 (3/8)
c, d, e
Φ15.88 (5/8)
Φ9.52 (3/8)
Diagram
Condition
f, g, h, i,
j, k, l, m
7 ,9, 12
Φ9.52 (3/8)
Φ6.35 (1/4)
Φ12.70 (1/2)
䇭
Φ6.35 (1/4)
Φ15.88 (5/8)
Φ9.52 (3/8)
Between outdoor unit and first
separation tube
Between first separation tube and
second separation tube
b
Between separation tube and
branch box
Between branch box and indoor unit
Gas pipe
(mm(in.))
(Model code of indoor unit)
18
24
Φ15.88 (5/8)
Φ6.35 (1/4)
9379069342-02_IM.indb 11
17/5/2556 11:49:37
