Mitsubishi Electric R410A, Service Handbook

Page: 53 / 346

[2-10 Restrictions on Refrigerant Pipes ]
- 44 - HWE14080 GB
2-10 Restrictions on Refrigerant Pipes
2-10-1 Restrictions on Refrigerant Pipe Length
(1) P72 - P168 models
Unit: m [ft]
Operation Pipe sections
Allowable length of
pipes
Length Total pipe length A+B+C+D
+a+b+c+d+e+f
1000 [3280] or less
Total pipe length (L) from the outdoor unit to the
farthest indoor unit A+B+C+c or
A+D+f
165 [541] or less
(Equivalent length 190
[623] or less)
Total pipe length from the first branch to the far-
thest indoor unit (
)
B+C+c or
D+f
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 indoor unit
liquid pipes.
Height
difference Between indoor and
outdoor units Outdoor unit above in-
door unit H 50 [164] or less
Outdoor unit below in-
door unit H' 40 [131] or less
Between indoor units h 15 [49] or less
*2
*2. If the height difference between indoor units exceeds 15 meters (but does not exceed 30 meters), use one-size
larger pipes for indoor unit liquid pipes.
L
B
e
h
f
6
1
a
c
b
3 2
5
A
D
C
d
4
H
H
'
Branch joint
Indoor Indoor Indoor
Indoor Indoor Indoor
cap
Branch header
(Outdoor unit above indoor unit) (Outdoor unit below indoor unit)
Outdoor unit
First branch
(Branch joint)