Mitsubishi Electric PUHY-P1000, Service Handbook

Page: 56 / 334

[2-10 Restrictions on Refrigerant Pipes ]
- 47 -
HWE14040 GB
2 Rest
rict
io
ns
(2) P400 - P1350YSKB models
See the next page for the detailed description of the sample application above.
Unit: m [ft]
Operation Pipe sections
Allowable length of
pipes
Length Between outdoor units A+B+C+D 10 [32] or less
Total pipe length A+B+C+D+E+F+G+I+J
+K+M+a+b+c+d+e+f+g
+i
1000 [3280] or less
Total pipe length (L) from the outdoor unit to the
farthest indoor unit A(B)+C+E+J+K+M+i 165 [541] or less
(Equivalent length 190
[623] or less)
Total pipe length from the first branch to the far-
thest indoor unit (
)
G+I+J+i 40 [131] or less
*1
*1. If the piping length exceeds 40 meters (but does not exceed 90 meters), use one-size larger pipes for all the liquid
pipes beyond 40 meters. In the figure above, the pipes whose size should be increased by one size are indicated
by "I," "c," and "d" when the piping length exceeds 40 meters at point I.
Height
difference Between indoor and outdoor units H 50 [164] or less
(40 [131] or below if
outdoor unit is below in-
door unit)
Between indoor units h1 15 [49] or less
*2
*2. If the vertical difference between indoor units exceeds 15 meters (but does not exceed 30 meters), use one-size
larger liquid pipes for the relevant indoor units. In the figure above, the pipes whose size should be increased by
one size are indicated by "J," "K," "M," "e," "f," "g,"and "i" when the "h1" exceeds 15 meters.
Between outdoor units h2 0.1[0.3] or less
Indoor Indoor Indoor Indoor
Indoor Indoor Indoor Indoor
E
L
H
a
h1
h2
b
2
1
c
3
d
4
e
5
f
6
g
7
i
8
C
E F G I
J K M
B D A
First branch
(Note)
To downstream units
Note : "Total sum of downstream unit model numbers"
in the table is the sum of the model numbers
of the units after point E in the figure.
Note1 Install the pipe that connects the branch pipe and the outdoor units in
the way that it has a downward inclination toward the branch pipe.
Provide a trap on the pipe (gas pipe only) within 2 m from the
joint pipe if the total length of the pipe that connects the joint
pipe and the outdoor unit exceeds 2 m.
Downward inclination
To indoor unit
To indoor unit
To indoor unit
Joint pipe
Joint pipe
Trap
(gas pipe
only)
To indoor unit
Upward inclination
First liquid refrigerant distributor
First gas refrigerant distributor
Second gas refrigerant distributor
Second liquid refrigerant distributor
2m [6ft]
2m [6ft] Max.
Outdoor unit Outdoor unit
Outdoor unit