Mitsubishi Electric PUHY-P1000, Service Handbook

Page: 55 / 334

- 46 -
[2-10 Restrictions on Refrigerant Pipes ]
GB HWE14040
2-10 Restrictions on Refrigerant Pipes
2-10-1 Restrictions on Refrigerant Pipe Length
(1) P200 - P500YKB models
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)
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
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
*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 "C," "b," and "c" when the piping length exceeds 40 meters at point C.
*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 "B," "C," "a," "b," and "c" when the "h" exceeds 15 meters.