Mitsubishi Electric PUHY-RP200, Service Handbook

Page: 60 / 306

[
II
Restrictions ]
- 51 -
HWE10130 GB
(2) Using a branch joint to merge the existing piping systems
1) The maximum allowable piping length for the RP650 through RP900 models is 250 m [820 ft].
Observe the piping length limitation imposed by the refrigerant amount as calculated with the formula below.
PUHY-RP200 - RP250YJM: 0.39 × L
0
+ 0.29 × L
1
+ 0.2 × L
2
+ 0.12 × L
3
+ 0.06 × L
4
+ 0.024 × L
5
< 18 (kg)
PUHY-RP300 - RP900Y(S)JM: 0.39 × L
0
+ 0.29 × L
1
+ 0.2 × L
2
+ 0.12 × L
3
+ 0.06 × L
4
+ 0.024 × L
5
< 25 (kg)
PUHY-RP200 - RP250YJM: 4.20× L
0
' + 3.12× L
1
' + 2.15 × L
2
' + 1.29 × L
3
' + 0.65 × L
4
' + 0.26 × L
5
' < 40 [oz]
PUHY-RP300 - RP900Y(S)JM: 4.20× L
0
' + 3.12× L
1
' + 2.15 × L
2
' + 1.29 × L
3
' + 0.65 × L
4
' + 0.26 × L
5
' < 56 [oz]
2) The maximum allowable piping length for the RP650 through RP900 models is 100 m [328 ft] (Equivalent length: 125 m [410
ft])
3) The piping length difference between the two piping systems that are merged with a branch joint should be 40 m [131 ft] or
less.
h
1 2 1 2
3 4
3 4
A
a b
c d
B C
L
Piping in a non-REPLACE MULTI system Piping in a REPLACE MULTI system
H
(Outdoor unit above indoor unit)
H '
(Outdoor unit below indoor unit)
Indoor Indoor
Indoor Indoor
Indoor Indoor
Indoor Indoor
First branch
(Branch joint)
Outdoor unit
Unit: m [ft]
Operation Pipe sections Allowable length of pipes
Piping length
Total pipe length A+B+C+a+b+c+d 300 [984] or less (Note 1)
Total pipe length (L) from the outdoor unit
to the farthest indoor unit
A+C+d
or
A+B+b
120 [393] or less
(Equivalent length 150 [492]or less)
(Note 2)
Total pipe length from the first branch to
the farthest indoor unit ( )
B+b
or
C+d
100 [328] or less (Note 3)
Height
difference
Between indoor and
outdoor units
Outdoor unit
above indoor unit
H
50 [164] or less
Outdoor unit be-
low indoor unit
H'
40 [131] or less
Between indoor units h 15 [49] or less
L
0
: Length of ø22.2 liquid pipe (m)
L
1
: Length of ø19.05 liquid pipe (m)
L
2
: Length of ø15.88 liquid pipe (m)
L
3
: Length of ø12.7 liquid pipe (m)
L
4
: Length of ø9.52 liquid pipe (m)
L
5
: Length of ø6.35 liquid pipe (m)
L
0
' : Length of ø22.2 [7/8"] liquid pipe [ft]
L
1
' : Length of ø19.05 [3/4"] liquid pipe [ft]
L
2
' : Length of ø15.88 [5/8"] liquid pipe [ft]
L
3
' : Length of ø12.7 [1/2"] liquid pipe [ft]
L
4
' : Length of ø9.52 [3/8"] liquid pipe [ft]
L
5
' : Length of ø6.35 [1/4"] liquid pipe[ft]