EN
EN
EN
ID
– 18 –
Allowable length of refrigerant pipes and allowable height
difference between units
abcde
(e)
(b)
(a)
(c)
(d)
L4
fghij
(j)
L5 L6
Height
difference
between
outdoor
units
H3 5 m
Height
difference
between
outdoor
and indoor
units:
H1 (70 m)
Main
piping
L1
Outdoor
Equivalent length corresponded to farthest piping
between outdoor unit
LO < 40 m
Y-shape branching
joint for gas pipe
Branching piping
L2
Equivalent length corresponded to farthest piping L 250 m
Equivalent length corresponded to farthest piping after 1st branching
Li 90 m
Height
difference
between
indoor
units:
H2 40 m
Indoor unit
Connecting piping of indoor unit
1st branching
section
Branching
header
Indoor unit
Y-joint
L7 Y-joint
Y-shape branching
joint for liquid pipe
A
Header
unit
B
Follower
C
Follower
D
Follower
E
Follower
unit
L3
System restriction
stinu 5 ot pUnoitanibmoc tinu roodtuO
PH 021 ot pUstinu roodtuo fo yticapac latoT
stinu 821 ot pUnoitcennoc tinu roodnI
Total capacity of indoor units
(varies depending on the height difference between
indoor units.)
H2 15 m
Single 200% of outdoor units’ capacity
Combination 150% of outdoor units’ capacity
H2 > 15 m 105% of outdoor units’ capacity
Cautions for installation
Set the outdoor unit first connected to the bridging pipe to the indoor units as the header unit.
Install the outdoor units in order of their capacity codes: A (header unit) B C D E
When connecting gas pipes to indoor units, use Y-shaped branching joints to keep pipes level.
When piping to outdoor units using Outdoor unit connection piping kits, intersect the pipes to the outdoor unit
and those to indoor units at a right angle as shown in figure 1 on “6. Installation of the outdoor unit”.
Allowable length and allowable height difference of refrigerant piping
Item
Allowable
value
Piping section
Piping length
Total extension of pipe (Liquid
pipe, real length)
Single outdoor
unit system
500 m
LA + LB + LC + La + Lb + Lc + Ld + Le +
L1 + L2 + L3 + L4 + L5 + L6 + L7 + a + b
+ c + d + e + f + g + h + i + j
Multiple
outdoor unit
system
1200 m (*6)
Farthest piping Length L (*1)
Equivalent
length
250 m
LA + LB + LC + Le + L1 + L3 + L4 + L5
+ L6 + j
Real length 210 m
Max. equivalent length of main
piping
Equivalent
length
120 m (*3)
L1
Real length 100 m (*3)
Equivalent length of farthest piping from 1st
branching Li (*1)
90 m (*2) L3 + L4 + L5 + L6 + j
Equivalent length of farthest piping between
outdoor units LO
40 m LA + LB + LC + Le (LA + LB + LC + Ld)
Max. equivalent length of outdoor unit connecting
piping
10 m La, Lb, Lc, Ld, Le
Max. real length of indoor unit connecting piping 30 m a, b, c, d, e, f, g, h, i, j
Max. equivalent length between branches 50 m L2, L3, L4, L5, L6, L7
Difference in
height
Height between indoor and
outdoor units H1
Upper
outdoor unit
70 m
(*6)
–
Lower
outdoor unit
40 m
–
Height between indoor units H2 – 40 m (*8)
Height between outdoor units H3 –m 5
*1: (E) is outdoor unit furthest from the 1st branch and (j) is the indoor unit furthest from the 1st branch.
*2: If the height difference between indoor and outdoor unit (H1) exceeds 3 m, the piping length is 65 m or less.
*3: If the max. combined outdoor unit capacity is 54 HP or more, then max. equivalent length is 70 m or less (real length is
50 m or less).
*4: If the height difference between indoor units (H2) exceeds 3 m, the difference in height is 30 m or less.
*5: Total charging refrigerant is 140 kg or less.
*6: Extension up to 110 m is possible with conditions below :
&DSDFLW\RIFRPELQHGLQGRRUXQLWVRUOHVV
7KHKHLJKWGLfference between indoor units (H2) is 3 m or less.
*7: Extension up to 110 m is possible with conditions below :
*8: If the connected ratio of indoor units to outdoor unit is more than 105%, set 15 m or less.
&DSDFLW\RIFRPELQHGLQGRRUXQLWVRUOHVV
0LQLPXPFDSDFLW\RIFRQQHFWLQJLQGRRUXQLWLVPRUHWKDQ +3
7KHKHLJKWGLfference between indoor units (H2) is 3 m or less.
(*4, *7)
Do not connect them as in figure 2 on “6. Installation of the outdoor unit”.
To Next Page
Loading...
