Mitsubishi Electric PUHY-RP-Y(S)JM-B, Справочник данных

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3. Piping Design
SYSTEM DESIGN 222
3. Piping Design
3-1. Piping Design
Note 3. Indoor capacity is described as its model size.
For example, PEFY-P32VMM-E, its capacity is P32.
Note 4. Total down-stream Indoor capacity is the summary of the model size of Indoors downstream.
For example, PEFY-P25VMM-E + PEFY-P32VMM-E: Total Indoor capacity = P25 + P32 = P57
Note 5. Piping size determined by the Total down-stream indoor capacity is NOT necessary
to be bigger than the up-stream one.
i.e. A >= B; A >= C >= D
Note 1. No Joint after Header; Piping direct to Indoor Unit from Header
Note 2. As bents cause pressure loss on transportation of refrigerant, fewer bents design is better.
Piping length needs to consider the actual length and equivalent length which bents are counted.
Equivalent piping length (m) = Actual piping "M" x Quantity of bent.
IU : Indoor unit, OU : Outdoor unit
Fig. 3-1-1A Piping scheme
L1
L2
C
b
h1
c
d
g
e
A
B
D
a
OU
Joint
H (OU above IU) H' (OU under IU)
IU IU
f
E
IU IU
IU IU IU
Header
1st Joint
Capped
*1
*2
3-1-1. PUHY-RP200-350YJM-B
Table 3-1-1-1. Piping length (m)
Item Piping in the figure Max. length Max. equivalent length
Total piping length A+B+C+D+E+a+b+c+d+e+f+g 300
Farthest IU from OU (L1) A+C+D+E+g / A+B+c 120 150
Farthest IU from first joint (L2) C+D+E+g / B+c 40
Height between OU and IU (OU above IU) H 50
Height between OU and IU (OU under IU) H'
40
Height between IU and IU h1 15
OU: Outdoor Unit, IU: Indoor Unit
Table 3-1-1-3. Piping "A" size selection rule (mm)
Outdoor Pipe (Liquid) Pipe (Gas)
PUHY-RP200YJM-B ø12.7 ø28.58
PUHY-RP250YJM-B ø12.7 ø28.58
PUHY-RP300YJM-B ø12.7 ø28.58
PUHY-RP350YJM-B ø15.88 ø34.93
Table 3-1-1-4. R410A piping "B", "C", "D", "E" size selection rule (mm [in.])
Total down-stream Indoor capacity Pipe (Liquid) Pipe (Gas)
~ P80 ø9.52 [3/8"] ø15.88 [5/8"]
P81 ~ P160 ø12.7 [1/2"] ø19.05 [3/4"]
P161 ~ P330 ø12.7 [1/2"] ø25.4 [1"]
P331 ~ P630 ø15.88 [5/8"] ø34.93 [1-3/8"]
P631 ~ ø19.05 [3/4"] ø41.28 [1-5/8"]
Table 3-1-1-5. Piping "a", "b", "c", "d", "e", "f", "g" size selection rule (mm [in.])
Indoor Unit size Pipe (Liquid) Pipe (Gas)
P20, P25, P32, P40 ø6.35 [1/4"] ø12.70 [1/2"]
P50, P63, P71, P80 ø9.52 [3/8"] ø15.88 [5/8"]
P140 ø9.52 [3/8"] ø19.05 [3/4"]
P200 ø12.7 [1/2"] ø25.4 [1"]
P250 ø12.7 [1/2"] ø28.58 [1-1/8"]
Table 3-1-1-2. Bent equivalent length "M"
Outdoor unit model M (m/bent)
PUHY-RP200YJM-B 0.35
PUHY-RP250YJM-B 0.42
PUHY-RP300YJM-B 0.42
PUHY-RP350YJM-B 0.47
* 1 Do not exceed the amount of refrigerant to be charged written below.
PUHY-RP200-250YJM-B: 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
PUHY-RP300-350YJM-B: 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
L
0
: Total length of ø22.2 liquid pipe (m)
L
1
: Total length of ø19.05 liquid pipe (m)
L
2
: Total length of ø15.88 liquid pipe (m)
L
3
: Total length of ø12.7 liquid pipe (m)
L
4
: Total length of ø9.52 liquid pipe (m)
L
5
: Total length of ø6.35 liquid pipe (m)
* 2 When creating 1 system out of the pipework of 2 systems, (L1-L2) must be 40 m or less.
L1: Distance between system 1's original outdoor unit and system 1's original farthest indoor unit.
L2: Distance between system 2's original outdoor unit and system 2's original farthest indoor unit.
L1 L2