Midea MVUR252B-VA3, Service Manual

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MIV V5 Heat Recovery DC Inverter R410A DM14-01.01.18en
109 Installation Procedure
6. Refrigerant piping installation
6.1 Refrigerant piping length permitted value
Piping length Permitted value Piping
Pipi
ng le
ngth
Total piping length
≤ 1000m
(refer to note 1)
L1+(L2+L3+L4+L5+L6+L7+L8+L9+L10+L11+L
12+L13)×2+a+b+c+d+e+f+g+h+i+j+k+l+m+n
Single piping length
Actual length ≤ 175m
L1+L7+L9+L11+j+k+n
Equivalent length
≤ 200m
(refer to note 2)
Piping length from the first branch joint to the
farthest indoor unit
≤ 40/90m
(refer to note 3)
L7+L9+L11+j+k+n
Piping length from MS to the downstream
indoor unit of itself
≤ 40m j+k+n
Leve
l dif
fere
nc
e
Level difference
between indoor unit
and outdoor unit
Outdoor unit up
≤ 70m
(refer to note 4)
/
Outdoor unit down
≤ 110m
(refer to note 5)
/
Level difference between indoor units ≤ 30m /
Note:
The indoor units should be installed as possible as equal in the both sides of the U-shape branch joint.
1. When counting the total piping length, the actual length of the distribution pipes which between the first branch joint and MS
should be double:
Total piping length= L1+(L2+L3+L4+L5+L6+L7+L8+L9+L10+L11+L12+L13)×2+a+b+c+d+e+f+g+h+i+j+k+l+m+n ≤ 1000m
N3
(140)
N5
(140)
N6
(71)
N7
(71)
N9
(56)
N8
(28)
N2
(71)
N4
(28)
N1
(71)
N10
(56)
A
B
C
E
F
Ⅱ
Ⅳ
Ⅲ
Ⅰ
b
c
d
f
g
j
h
i
l
k
m n
e
L
1
L
2
L
9
L
13
L
11
L
10
L
12
L
3
a
MS1
MS2
MS3
MS4
MS5
MS6
L
4
L
5
L
6
Outdoor unit
(one or more outdoor units)
Max. piping length from the first branch
Joint to the farthest indoor unit: 295ft(90m)
Max. equivalent single piping length: 656ft(200m)
Max. piping length from MS to its
downstream indoor unit: 131ft(40m)
The first line branch pipe
Max
. l
e
ve
l di
fferen
ce
b
e
tw
e
e
n
In
do
or un
it an
d ou
td
o
o
r un
it:
3
6
1
ft(
11
0
m
)
M
a
x.
le
ve
l d
iff
e
re
n
ce
b
e
tw
e
e
n
in
d
o
o
r u
n
its
: 9
8
ft
(3
0
m
)
Indoor unit
D
N11
(140)
p
N12
(140)
q
N13
(56)
r
L
8
L
7
MS7