Mitsubishi Electric PUHY-RP-Y(S)JM-B, Data Book

Page: 227 / 293

3. Piping Design
SYSTEM DESIGN 224
Outdoor Twinning Kit
CMY-RP100VBK
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.
H (OU above IU)
h1
H' (OU under IU)
h2
1st Joint
Joint
b a
L2
L1
IU
IU IU IU
g
IU
e
IU
d
C
D
IU
f
E
T
S
A
B
Header
Capped
IU : Indoor unit, OU : Outdoor unit
Fig. 3-1-1C Piping scheme
c
2m
To indoor unit To indoor unit
To indoor unit
To indoor unit 2 m max
Trap (gas
pipe only)
Upward
incline Downward
incline
Install the pipes from the outdoor unit to the branch
joint with a downward incline. If the length of pipe between the branch joint and outdoor
unit exceeds 2 m, provide at rap at a distance 2 m or less
from the branch joint.
OK NG
3-1-3. PUHY-RP600-650YSJM-B
Table 3-1-3-1. Piping length (m)
Item Piping in the figure Max. length Max. equivalent length
Total piping length S+T+A+B+C+D+E+a+b+c+d+e+f+g 250
Distance between OU and OU S+T 10
Height between OU and OU h2 0.1
Farthest IU from OU (L1) S(T)+A+C+D+E+g / S(T)+A+B+c 120 150
Farthest IU from the 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 3-1-3-3. Piping "A" size selection rule (mm)
Outdoor Pipe (Liquid) Pipe (Gas)
PUHY-RP600YSJM-B ø19.05 ø34.93
PUHY-RP650YSJM-B ø19.05 ø41.28
Table 3-1-3-4. 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 3-1-3-5. 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 3-1-3-2. Bent equivalent length "M"
Outdoor unit model M (m/bent)
PUHY-RP600YSJM-B 0.50
PUHY-RP650YSJM-B 0.50
* 1 Do not exceed the amount of refrigerant to be charged written below.
PUHY-RP600-650YSJM-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
*1
*2
OU
OU
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