Mitsubishi Electric PUHY-RP200 Service Handbook page 60

[ II Restrictions ]
(2) Using a branch joint to merge the existing piping systems
Piping in a non-REPLACE MULTI system
Indoor Indoor
1 2
Total pipe length
Total pipe length (L) from the outdoor unit
to the farthest indoor unit
Piping length
Total pipe length from the first branch to
the farthest indoor unit ( )
Between indoor and
Height
outdoor units
difference
Between indoor units
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
PUHY-RP300 - RP900Y(S)JM: 0.39 × L
PUHY-RP200 - RP250YJM: 4.20× L
PUHY-RP300 - RP900Y(S)JM: 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) 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.
HWE10130
Indoor Indoor
3 4
Operation
Outdoor unit
above indoor unit
Outdoor unit be-
low indoor unit
+ 0.29 × L + 0.2 × L
0 1
+ 0.29 × L
0 1
' + 3.12× L ' + 2.15 × L
0 1
' + 3.12× L
0 1
Piping in a REPLACE MULTI system
Outdoor unit
First branch
B
(Branch joint)
a b
Indoor Indoor
1 2
Pipe sections
A+B+C+a+b+c+d
A+C+d
or
A+B+b
B+b
or
C+d
H
H'
h
+ 0.12 × L + 0.06 × L
2 3
+ 0.2 × L + 0.12 × L + 0.06 × L
2 3
' + 1.29 × L ' + 0.65 × L
2 3
' + 2.15 × L ' + 1.29 × L ' + 0.65 × L
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
- 51 -
A
C
c d
Indoor Indoor
3 4
Allowable length of pipes
300 [984] or less (Note 1)
120 [393] or less
(Equivalent length 150 [492]or less)
(Note 2)
100 [328] or less (Note 3)
50 [164] or less
40 [131] or less
15 [49] or less
+ 0.024 × L < 18 (kg)
4 5
+ 0.024 × L < 25 (kg)
4 5
' + 0.26 × L ' < 40 [oz]
4 5
' + 0.26 × L ' < 56 [oz]
4 5
Unit: m [ft]
GB