Mitsubishi Electric CITY MULTI H Series, Manual

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3. Piping Design
DATA U5
SYSTEM DESIGN
System H
Table3-2-2-4. R410A Joint selection rule
Total down-stream Indoor capacity Joint
~ P72 CMY-Y102S-G2
P73 ~ P144 CMY-Y102L-G2
P145 ~ P234 CMY-Y202-G2
*First Joint is always CMY-Y202-G2;
*Concerning detailed usage of Joint parts, refer to its Installation Manual.
Outdoor Twinning Kit
CMY-Y100VBK2
Note1. No Joint after Header; Piping direct to Indoor Unit from Header;
Note2. If the A/C system is designed to use cooling-mode under outside temperature 10°C [50°F], H’<=40m [131ft].
Note3. 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=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. 3-2-1B Piping scheme
c
2m [6.56ft]
To indoor unit To indoor unit
To indoor unit
To indoor unit
2m [6.56ft] 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 2m [6.56ft], provide at rap at a distance 2m [6.56ft] or
less from the branch joint.
OK
NO
3-2-2. PUHY-HP144-192TSHMU Piping
Table3-2-2-1. Piping length (m [ft.])
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 300 [984'] -
Distance between OU and OU S+T 10[32'] -
Height between OU and OU h2 0.1[0.3'] -
Farthest IU from OU (L1)
S(T)+A+C+D+E+g / S(T)+A+B+c 150 [492'] 175 [574']
Farthest IU from the first Joint (L2) C+D+E+g / B+c 40 [131'] 40 [131']
Height between OU and IU (OU above IU) H 50 [164'] -
Height between OU and IU (OU under IU) H' 40 [131'] -
Height between IU and IU h1 15 [49'] -
OU: Outdoor Unit, IU: Indoor Unit
Table3-2-2-3. Piping "A" size selection rule (mm [in.])
Outdoor and the first Joint Pipe(Liquid) Pipe(Gas)
CMY-Y100VBK2=CMY-Y202-G2 ø15.88[5/8"] ø28.58[1-1/8"]
For Piping size "S","T", please refer to specification of the Twining kit CMY-Y100VBK2 at the Outdoor unit's
external drawing.
Table3-2-2-2. Bent equivalent length "M"
Outdoor Model
M (m/bends [ft./bends])
PUHY-HP144TSHMU 0.50 [1.64]
PUHY-HP192TSHMU 0.50 [1.64]
OU
OU
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