Midea ATOM MDV-V28WDHN1 - Page 77

Atom B Series VRF 50/60Hz
76
Midea Atom B Series Engineering Data Book
Table 3-3.3: Connectable indoor units
Outdoor unit model
Number of connected indoor units
Connectable indoor unit capacity range
MDV-V28WDHN1(AtB)
1-4
45-130% outdoor unit’s capacity
MDV-V36WDHN1(AtB)
1-6
MDV-V42WDHN1(AtB)
1-7
MDV-V48WDHN1(AtB)
1-8
MDV-V56WDHN1(AtB)
1-9
3.5 Selecting Piping Diameters
Tables 3-3.4 to 3-3.5 below, specify the required pipe diameters for the indoor and outdoor piping.
Table 3-3.4: Indoor unit connecting pipe diameters
Total capacity of downstream inner units
Main pipe size (mm)
Gas pipe (mm)
Liquid pipe (mm)
A<19kBtu/h
9
Φ9.53
A≥19kBtu/h
Φ19.1
Φ9.53
Table 3-3.5: Outdoor unit connecting pipe diameters
Total capacity of downstream inner units
Main pipe size when the total
equivalent piping length
of liquid + air side is <90m
Main pipe size when the total
equivalent piping length
of liquid + air side is ≥90m
Gas pipe (mm)
Liquid pipe (mm)
Gas pipe (mm)
Liquid pipe (mm)
A<56 kBtu/h
Φ15.9
Φ9.5
Φ19.1
Φ9.5
A≥56 kBtu/h
Φ19.1
Φ9.5
Φ22.2
Φ9.5
Tables 3-3.6 to 3-3.7 below, specify the flexible branch header selection and piping sizes at the branch pipe.
Table 3-3.6: Flexible branch header selection
Connectable IDUs number
Model
2
DXFQT2-02
3
DXFQT3-02
4
DXFQT4-02
5
DXFQT5-02
6
DXFQT6-02
7
DXFQT2-02+DXFQT3-02+DXFQT4-02
8
DXFQT2-02+DXFQT4-02+DXFQT4-02
9
DXFQT2-02+DXFQT5-02+DXFQT4-02
Table 3-3.7: Piping sizes at the branch pipe
Refrigerant
Indoor Unit Capacity
A(×100W)
Gas pipe (mm)
Liquid pipe (mm)
R410A
A≤15
12.7(Flaring nut)
6.4(Flaring nut)
A≥19
15.9(Flaring nut)
9.5(Flaring nut)