Mitsubishi Electric PUHY-RP200 Service Handbook page 59

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[ II Restrictions ]
RP700, RP750, RP800, RP850, RP900 models
Outdoor unit
Outdoor unit
E
F
G
Second gas refrigerant distributor
Second liquid refrigerant distributor
First liquid refrigerant distributor
First gas refrigerant distributor
First branch
(Branch joint)
Indoor
unit side
Piping
length
Outdoor
unit side
Height
difference
1) Maximum allowable piping length depends on the total amount of refrigerant in a given system. Use the formulas below to
calculate the maximum length.
PUHY-RP700 - RP900YSJM: 0.39 × L
PUHY-RP700 - RP900YSJM: 4.20 × L
L
: Length of ø22.2 liquid pipe (m)
0
L
: Length of ø19.05 liquid pipe (m)
1
L
: Length of ø15.88 liquid pipe (m)
2
L
: Length of ø12.7 liquid pipe (m)
3
L
: Length of ø9.52 liquid pipe (m)
4
L
: Length of ø6.35 liquid pipe (m)
5
2) When merging two refrigerant piping systems into one, make sure the length difference between the two systems is 40 m [131
ft] or less.
HWE10010
Outdoor unit
(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.
I
Downward inclination
A
Upward inclination
B
C
Branch joint
a
1
Indoor
Operation
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 farthest indoor unit ( )
Between outdoor units
Outdoor unit
above indoor unit
Between indoor
and outdoor units
Outdoor unit be-
low indoor unit
Between indoor units
Between outdoor units
+ 0.29 × L
0
' + 3.12 × L
0
To indoor unit
To indoor unit
D
L
c
b
Indoor
3
Indoor
2
Pipe sections
A+B+C+D+E+F+G+I+a+b
+c+d+e+f
E(F)+G+A+B+C+c
or E(F)+G+A+D+f
B+C+c
or D+f
E+F+G+I
H1
H1'
h
H2
+ 0.2 × L
+ 0.12 × L
+ 0.06 × L
1
2
3
' + 2.15 × L
' + 1.29 × L
1
2
3
L
' : Length of ø22.2 [7/8"] liquid pipe [ft]
0
L
' : Length of ø19.05 [3/4"] liquid pipe [ft]
1
L
' : Length of ø15.88 [5/8"] liquid pipe [ft]
2
L
' : Length of ø12.7 [1/2"] liquid pipe [ft]
3
L
' : Length of ø9.52 [3/8"] liquid pipe [ft]
4
L
' : Length of ø6.35 [1/4"] liquid pipe[ft]
5
- 50 -
If the piping length between the branch pipe and the
outdoor unit exceeds 2 m [6 ft] , provide a trap on the
piping (gas piping only) within 2 m [6 ft] of the branch
pipe to prevent the refrigerant oil from accumulating in
the piping and causing compressor damage.
Minimum trap height: 200 mm [7 inches]
To indoor unit
2m [6 ft]
Trap
(gas pipe
only)
2m [6 ft] Max.
Branch header
e
d
Indoor
Indoor
Indoor
4
5
Allowable length of pipes
250 [820] or less (Note 1)
100 [328] or less
(Equivalent length 125 [410]or
40 [131] or less (Note 2)
10 [32] or less
(Equivalent length 12 [39] or
50 [164] or less
40 [131] or less
15 [49] or less
0.1 [0.3] or less
+ 0.024 × L
< 25 (kg)
4
5
' + 0.65 × L
' + 0.26 × L
' < 56 [oz]
4
5
To indoor unit
cap
f
6
Unit: m [ft]
less)
less)
GB

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