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Mitsubishi Electric PLA-RP-BA Technical Data Manual Page 90

Mitsubishi electric split-type, heat pump air conditioners.
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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 [19.05(RP250)/[22.2(RP200).(Do not use soft (annealed) one.)
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
[
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
4
1
B
C
4
E
3
2
A
Cooling capacity ratio
gas pipe [22.2
100%
100~95%
95~88%
88~83%
83~79%
79~75%
W(g)=(180oL
[
:
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. 30 m
4 Branch piping
5 Multi distribution
Height difference (Indoor unit-
2
pipe (option)
Indoor unit) Max. 1 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 points
8 points between main pipe A and
each branch pipe (B, C, D, E).
gas pipe [19.05
100%
100~88%
88~77%
)+(120oL
) (90oL
)+(30oL
1
2
3
4
Charge-less
piping length
A+B+C+D+E
30 m and less
90
)-3000

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