Mitsubishi Electric PLA-RP-AA Technical Data Book page 80

Pipe diameter and thickness
OD
[6.35 [9.52 [12.7
(mm)
Thickness
0.8 0.8 0.8
(mm)
Be sure to use hard (tempered) one for pipe over [22.2.(Do not use soft (annealed) one.)
4
1
4
D
1
5
<Table 6> Lowered cooling capacity by the smaller gas pipe diameter
Pipe length
5m and less
6~10m
11~20m
21~30m
31~40m
41~50m
<Table 7> Additional refrigerant amount when the liquid pipe of the larger diameter is used.
(Single /Simultaneous Twin / Simultaneous Triple / Simultaneous Quadruple)
Capacity When the extension pipe length (main piping + branch piping) exceeds 20m
RP200, RP250 Additional refrigerant amount W(g)=(180oL
[
L : 15.88 liquid pipe (m) L
1 2
[
L : 9.52 liquid pipe (m) L
3 4
If the calculation produces a negative number (i.e. a "minus" charge), additional charging is not necessary.
( W [ 0)
<Table 8>
Permissible total
Outdoor unit piping length
A+B+C+D+E
RP200
120 m and less
PR250
<Table 9>
B-C or B-D or
Outdoor unit B-E or C-D or
C-E or D-E
RP200
8 m and less
RP250
[15.88 [19.05 [22.2 [25.4 [28.58
1.0 1.0 1.0 1.0 1.0
4
1
B C
4
E
3
2
A
RP200 Cooling capacity ratio
gas pipe [22.2
100%
100~96%
96~91%
91~86%
86~83%
83~80%
[
: 12.7 liquid pipe (m)
[
: 6.35 liquid pipe (m)
A+B or A+C
or
A+D or A+E
100 m and less
Number of
pipe bends
Within 15
[31.75
1.1
1 Indoor unit
2 Outdoor unit
1 Height difference (Indoor unit-
3 Main piping
Outdoor unit) Max. 40 m
4 Branch piping
5 Multi disttibution
Height difference (Indoor unit-
2
pipe (option)
Indoor unit) Max. 8 m
1
3 Distance between indoor and indoor units
pipe length. Max. 8m
B—C B—D B—E
C—D C—E D—E
4 Number of pipe bends
Within 15
points8 points between main pipe A and
each branch pipe (B, C, D, E).
RP250 Cooling capacity ratio
gas pipe [19.05 gas pipe [25.4
100% 100%
100~91% 100~98%
91~81% 98~94%
94~91%
91~88%
88~86%
)+(120oL ) (90oL )+(30oL )-3000
1 2 3 4
Charge-less
piping length
A+B+C+D+E
30 m and less
80
gas pipe [22.2
100%
100~95%
95~88%