Pipe Length And Height Difference; Connection Without Branch Box; Connection With Branch Box - Mitsubishi Electric PUMY-P112VKM1 Installation Manual

4. Installing the refrigerant piping
A+a+b+c+d+e+f 300 m
L = A+f 150 m, ℓ = f
H 50 m (Outdoor lower H
h 15 m
A
L
ℓ
a b c d e
Fig. 4-1
c1
b1
H
a1
h1 *1
a2 a3
h3
Fig. 4-2
Total piping length
Farthest piping length (L)
Permissible
Piping length between outdoor unit and branch boxes
length
Farthest branch box from the first joint (b2)
(one-way)
Farthest piping length after branch box (l)
Total piping length between branch boxes and indoor units
In indoor/outdoor section (H)*1
Permissible
height differ-
In branch box/indoor unit section (h1)
ence
In each branch unit (h2)
(one-way)
In each indoor unit (h3)
Number of bends
*1 Branch box should be placed within the level between the outdoor unit and indoor units.
A+B+C+D+a+b+c+d+e 300 m
L = A+B+C+D+e 150 m
ℓ = B+C+D+e 30 m
H 50 m (Outdoor lower H
h 15 m
A
L
ℓ
e
B C D
a b c d
30 m
40 m)
A : Outdoor Unit
B : First Branch
C : Indoor unit
D : Cap
f
Outdoor unit
Branch box
Indoor unit
L
b2
h2
I
a5 a6 a7 a8
a4

4.2. Pipe length and height difference

4.2.1. Connection without Branch Box (Fig. 4-1)
A
40 m)
PUMY-P112-140
B, C, D
Ê Total capacity of indoor units
a, b, c, d, e, f
Ë Model number
15, 20, 25, 32, 40, 50
63, 80, 100, 125, 140
Í 4-Branching header
CMY-Y64-G-E
* When connecting the CONNECTION KIT (PAC-LV11M-J) and an M-series indoor
unit, refer to the installation manual for the CONNECTION KIT when selecting the
pipe size and piping length.
4.2.2. Connection with Branch Box (Fig. 4-2)
Flared connections
• This unit has flared connections on each indoor unit and branch box and outdoor
unit sides.
• Remove the valve cover of the outdoor unit, then connect the pipe.
• Refrigerant pipes are used to connect the branch box and outdoor unit.
c1 + b1 + b2 + a1 + a2 + a3 + a4 + a5 + a6 + a7 + a8
c1 + b2 + a8 80 m (b2 55 m, a8
c1 + b1 + b2 55 m
b2 30 m
a8 25 m
a1 + a2 + a3 + a4 + a5 + a6 + a7 + a8
H 50 m (In case of outdoor unit is set higher than indoor unit)
H 40 m (In case of outdoor unit is set lower than indoor unit)
h1 + h2 15 m
h2 15 m
h3 12 m
| c1 + b1 + a1 |, | c1 + b1 + a2 |, | c1 + b1 + a3 |, | c1 + b1 + a4 |, | c1 + b1 + a5 |, | c1 + b2 + a6 |,
| c1 + b2 + a7 |, | c1 + b2 + a8 |
È Liquid pipe É Gas pipe
ø9.52 ø15.88
È Liquid pipe É Gas pipe
ø9.52 ø15.88
È Liquid pipe É Gas pipe
ø6.35 ø12.7
ø9.52 ø15.88
Ì Branch kit model
CMY-Y62-G-E
Î 8-Branching header
CMY-Y68-G-E
150 m
25 m)
95 m
15
(mm)
(mm)
(mm)
7