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NOTE: The size of T-shaped pipe X connecting with
oil pipe is the same with that specified in three modules.
The sizes of T-shaped pipes Y and Z connecting with
gas pipe are the same with that specified in three modules.
1
Table 1
Pipe size and connection of outdoor unit
Model
MDV-D252W/CS
MDV-D280W/CS
MDV-D335W/CS
MDV-D400W/CS
MDV-D450W/CS
2
Table 2
Size of main pipe connecting multi-modules (unit: mm)
Capacity of parallel unit A (HP)
3
Table 3
Type of pipe
Name
Pipe location
Branch pipe
Directly connect to indoor unit
Main pipe
Not directly connect to indoor unit
4
Table 4
Size of main pipe
A: Capacity of all the indoor units.
A(horsepower)
Main pipe(gas side/liquid side)
A
12
F 28.6/ F12.7
12
A
16
F38.0/ F15.9
F38.0/ F19.0
16
A
24
F45.0/ F22.0
24
A
32
F54.0/ F25.0
32
A
48
F67.0/ F28.6
48
A
64
Note: Select the first branch joint based on the capacity of outdoor
unit, which should be larger than other branch joints.
4.Take 30HP outdoor unit for example:
1 a 2
b 3
c
7
8
9
#
#
#
1
2
3
(5P)
(5P)
(5P)
Determine pipe size
1. Branch pipes: No.7, 8, 9, 10,11, 12 and 13 the size is F19.0/F9.53
2. 6# and 7# indoor units connect with pipe 6, total HP is 2+5=7P 10P pipe size is
F28.6/F12.7, model of branch join: MDV-BY101
3. Subordinate indoor units of pipe 5 are :5#, 6# and 7#, total HP is 3+2+5=10P
pipe size is F28.6/ F12.7, model of branch joint: MDV-BY101
4. Subordinate indoor unis of pipe 4 are 4#, 5#, 6# and 7#, total HP is 5+3+2 +5=15P
16P, pipe size is F38.0/F15.9, model of branch joint:MDV-BY102(A)
5. Subordinate indoor units of pipe 3 are 3#, 4#, 5#, 6# and 7#, total HP is 5+5+3+2+5=
20P 24P, pipe size is F38.0/F19.0, model of branch joint:MDV-BY102(A)
6. Subordinate indoor units of pipe 2 are 2# 7#, totel HP is 5+5+5+3+2+5=25P 32P,
pipe size is F45.0/F22.0, model of branch joint:MDV-BY103(A)
7. Pipe 1 is main pipe, the size is F45.0/F22.0, model of branch joint: MDV-BY103(A)
4. Table 5
Pipe size and connection of indoor unit
Gas side
F19.0 flaring nut
Length and Drop Height Permitted of the Refrigerant piping
Total Pipe Length (Actual)
Actual Length
Max Piping (L)
Equivalent Length
Piping (farthest from the first line
pipe branch) Equivalent Length (l)
Outdoor Unit Up
Indoor-Outdoor Unit
Drop Height(H)
Outdoor Unit Down
Indoor Unit to Indoor Unit Drop Height(h)
Liquid side
Gas side
28.6(welding)
12.7(flaring nut)
28.6(welding)
12.7(flaring nut)
28.6(welding)
12.7(flaring nut)
38.0(welding)
15.9(flaring nut)
38.0(welding)
15.9(flaring nut)
Pipe size (gas/liquid)
Number in chart
3
1
2
Branch joint
MDV-BY101
MDV-BY102(A) (refit)
MDV-BY102(A)
MDV-BY103(A)
MDV-BY104
MDV-BY105
7#
4
d
5
e
6
f 13
5P
10
11
12
#
#
#
4
5
6
(5P)
(3P)
(2P)
Liquid side
9.53 flaring nut
Permitted value
Piping
20HP
2 5 0 m
L1+L2+L3+L4+L5+L6
+a+b+c+d+e+f+g+h+i
3 0 0 m
20HP
130m
L1+L3+L4+L5+L6+i
150m
4 0 m
L3+L4+L5+L6+i
5 0 m
3 0 m
1 5 m
Outdoor Unit (one or more outdoor units)
L
1
First branch
L
3
Remove Dirt or Water in the Piping
Make sure there is no any dirt or water before
connecting the piping to the outdoor units.
Wash the piping with high pressure nitrogen, never
use refrigerant of the outdoor unit.
Airtight Test
1. Connect piping on hi-pressure side with hi-pressure
valve. (For multi-modules parallel connection, please
connect gas and oil balance valves.)
2. Weld the piping on low-pressure side with gauge joint.
3. Charge nitrogen from hi-pressure valve core and gauge
joint.
4. After airtight test, weld low-pressure ball valve and
piping on low--pressure side.
1. Pressured nitrogen [2.94MPa (30kg/cm ) should be used in the
airtight test.
2. Do not connect piping on low-pressure side and low-pressure ball
valve before charging nitrogen.
3. The airtight test should never use any oxygen, flammable gas
or poisonous gas.
4. Wrap low-pressure valve and balance valves with wet cloth while welding.
Gas balance valve
Gas balance valve
Oil balance valve
Hi-pressure valve
10P,
Gauge joint
Indoor unit and branch joint
Vacuum with vacuum pump
Do vacuum with vacuum pump instead of refrigerant.
Vacuuming should be done from liquid and gas side
simultaneously. The pressure should be lower than
30Pa.
Open all valves
Refrigerant Amount to be Added
Calculate the added refrigerant according to the diameter
and the length of the liquid side pipe of the ou tdoor/indoor
unit connection. The refrigerant is R22.
Pipe size on liquid side
f 9.53
f 12.7
f 15.9
f 19.0
f 22.0
f 25.0
f 28.6
L
Branch header
2
c
a
b
Indoor Unit
Max Piping Equivalent Length L 125m
(From the first branch) Max piping Equivalent Length l 40m
L
L
L
4
5
6
g
e
h
f
Indoor Unit
CAUTION
2
Low-pressure ball valve
Refrigerant to be Added per meter
0.065kg
0.115kg
0.190kg
0.290kg
0.380kg
0.580kg
0.760kg
d
h
15m
i
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