2-10 Restrictions On Refrigerant Pipes; Restrictions On Refrigerant Pipe Length - Mitsubishi Electric R410A Service Handbook

[2-10 Restrictions on Refrigerant Pipes ]

2-10 Restrictions on Refrigerant Pipes

2-10-1

Restrictions on Refrigerant Pipe Length

(1) P72 - P168 models
Outdoor unit
A
First branch
(Branch joint)
Branch joint
Length Total pipe length
Total pipe length (L) from the outdoor unit to the
farthest indoor unit
Total pipe length from the first branch to the far-
thest indoor unit ( )
Height Between indoor and
difference outdoor units
Between indoor units
*1. If the piping length exceeds 40 meters (but does not exceed 90 meters), use one-size larger pipes for indoor unit
liquid pipes.
*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.
HWE14080
D
L
B
C
a b
1 Indoor 2 Indoor 3
Operation
Outdoor unit above in-
door unit
Outdoor unit below in-
door unit
d
Indoor
4
c
Indoor
Pipe sections
A+B+C+D
+a+b+c+d+e+f
A+B+C+c or
A+D+f
B+C+c or
D+f
H
H'
h
- 44 -
Branch header
cap
e
f
Indoor Indoor
6
5
Unit: m [ft]
Allowable length of
pipes
1000 [3280] or less
165 [541] or less
(Equivalent length 190
[623] or less)
*1
40 [131] or less
50 [164] or less
40 [131] or less
*2
15 [49] or less
GB