Midea V6-i Series User manual

Commercial Air Conditioners
R410A
Engineering Data
MVi-200WV2RN1(A) MVi-280WV2RN1(A)
MVi-224WV2RN1(A) MVi-335WV2RN1(A)
MVi-260WV2RN1(A)
V6-i Series VRF

V6-i VRF 50Hz
1
CONTENTS
CONTENTS
Part 1 General Information............................................................................ 3
Part 2 Outdoor Unit Engineering Data ....................................................... 19
Part 3 System Design and Installation........................................................ 77

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Midea V6-i Series Engineering Data Book

V6-i VRF 50Hz
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Part 1 - General Information
Part 1
General Information
1 Indoor and Outdoor Unit Capacities...................................................... 4
2 External Appearance ................................................................................ 6
3 Nomenclature ........................................................................................... 8
4 Combination Ratio ................................................................................. 12
5 Selection Procedure ............................................................................... 13

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Midea V6-i Series Engineering Data Book
1Indoor and Outdoor Unit Capacities
1.1 Indoor Units
1.1.1 VRF indoor units
Table 1-1.1: Indoor unit abbreviation codes
Abbreviation
code
Type
Abbreviation
code
Type
Q1
One-way Cassette
T1
High Static Pressure Duct
Q2
Two-way Cassette
G
Wall-mounted
Q4C
Compact Four-way Cassette
DL
Ceiling & Floor
Q4
Four-way Cassette
F
Floor Standing
T2
Medium Static Pressure Duct
Z
Console
Table 1-1.2: Indoor unit capacity range
Capacity
Capacity
index
Q1
Q2
Q4C
Q4
T2
T1
G
DL
F
Z
kW
kBtu/h
HP
1.8
5
0.6
18
18
—
—
—
—
—
—
—
—
—
2.2
7
0.8
22
22
22
22
—
22
—
22
—
22
22
2.8
9
1
28
28
28
28
28
28
—
28
—
28
28
3.6
12
1.25
36
36
36
36
36
36
—
36
36
36
36
4.5
15
1.6
45
45
45
45
45
45
—
45
45
45
45
5.6
19
2
56
56
56
—
56
56
—
56
56
56
—
7.1
24
2.5
71
71
71
—
71
71
71
71
71
71
—
8.0
27
3
80
—
—
—
80
80
80
80
80
80
—
9.0
30
3.2
90
—
—
—
90
90
90
90
90
—
—
10.0
34
3.6
100
—
—
—
100
—
—
—
—
—
—
11.2
38
4
112
—
—
—
112
112
112
—
112
—
—
14.0
48
5
140
—
—
—
140
140
140
—
140
—
—
16.0
55
6
160
—
—
—
—
—
160
—
160
—
—
20.0
68
7
200
—
—
—
—
—
200
—
—
—
—
25.0
85
9
250
—
—
—
—
—
250
—
—
—
—
28.0
96
10
280
—
—
—
—
—
280
—
—
—
—
40.0
136
14
400
—
—
—
—
—
400
—
—
—
—
45.0
154
16
450
—
—
—
—
—
450
—
—
—
—
56.0
191
20
560
—
—
—
—
—
560
—
—
—
—
1.1.2 Fresh air processing unit
Table 1-1.3: Fresh air processing unit capacity range
Capacity
12.5kW
14kW
20kW
25kW
28kW
Capacity index
125
140
200
250
280
1.2 Heat recovery ventilator
Table 1-1.4: Heat recovery ventilator capacity range
Capacity
m3/h
200
300
400
500
800
1000
1500
2000
CFM
120
180
240
300
470
590
880
1180

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Part 1 - General Information
1.3 Outdoor Units
Table 1-1.5: Outdoor unit capacity range
Capacity
Model Name
7HP
MVi-200WV2RN1(A)
8HP
MVi-224WV2RN1(A)
9HP
MVi-260WV2RN1(A)
10HP
MVi-280WV2RN1(A)
12HP
MVi-335WV2RN1(A)
Notes:
1. V6-i series outdoor units could not be combined.

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Midea V6-i Series Engineering Data Book
2External Appearance
2.1 Indoor Units
2.1.1 VRF indoor units
Table 1-2.1: Indoor unit appearance
One-way Cassette
Two-way Cassette
Q1
Q2
Compact Four-way Cassette
Four-way Cassette
Q4C
Q4
Medium Static Pressure Duct
High Static Pressure Duct
T2
T1
Wall-mounted
Ceiling & Floor
G
DL
Floor Standing
Console
F
Z
2.1.2 Fresh air processing unit
Table 1-2.2: Fresh air processing unit appearance
Fresh Air Processing Unit
FA

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Part 1 - General Information
2.2 Heat Recovery Ventilator
Table 1-2.3: Heat recovery ventilator appearance
Heat Recovery Ventilator
2.3 Outdoor Units
Table 1-2.4: Outdoor unit appearance
7-12HP

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Midea V6-i Series Engineering Data Book
3Nomenclature
3.1 Indoor Units
3.1.1 Standard indoor units
AC Series
MDV
-
D
28
Q4
/
N1
-
E
○
1
○
2
○
3
○
4
○
5
○
6
Legend
No.
Code
Remarks
1
MDV
Midea VRF
2
D
VRF indoor unit
3
28
Capacity index (the capacity in kW multiplied by 10)
4
Q4
Indoor unit type
Q1: One-way Cassette
Q2: Two-way Cassette
Q4C: Compact Four-way Cassette
Q4: Four-way Cassette
T2: Medium Static Pressure Duct
T1: High Static Pressure Duct
G: Wall-mounted
DL: Ceiling & Floor
F: Floor Standing
Z: Console
5
N1
Refrigerant type (N1: R410A)
6
E
Design code

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Part 1 - General Information
DC series
M
I
2
-
22
Q1
D
H
N1
○
1
○
2
○
3
○
4
○
5
○
6
○
7
○
8
Legend
No.
Code
Remarks
1
M
Midea
2
I
VRF indoor unit
3
2
The 2nd generation VRF DC indoor unit
4
22
Capacity index (the capacity in kW multiplied by 10)
5
Q1
Indoor unit type
Q1: One-way Cassette
Q2: Two-way Cassette
Q4C: Compact Four-way Cassette
Q4: Four-way Cassette
T2: Medium Static Pressure Duct
T1: High Static Pressure Duct
G: Wall-mounted
DL: Ceiling & Floor
F: Floor Standing
Z: Console
6
D
Series category (D: DC series)
7
H
Power supply
Omit: 1 phase, 220-240V, 50Hz
H: 1 phase, 220-240V, 50/60Hz
8
N1
Refrigerant type (N1: R410A)
3.1.2 Fresh air processing unit
AC Series
MDV
-
D
280
T1
/
N1
-
FA
○
1
○
2
○
3
○
4
○
5
○
6
Legend
No.
Code
Remarks
1
MDV
Midea VRF
2
D
AC series VRF indoor unit
3
280
Capacity index (the capacity in kW multiplied by 10)
4
T1
High static pressure duct
5
N1
Refrigerant type (N1: R410A)
6
FA
Indoor unit type
FA: Fresh Air Processing Unit

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Midea V6-i Series Engineering Data Book
DC series
M
I
2
-
280
FA
D
H
N1
○
1
○
2
○
3
○
4
○
5
○
6
○
7
○
8
Legend
No.
Code
Remarks
1
M
Midea
2
I
VRF indoor unit
3
2
The 2nd generation VRF DC indoor unit
4
280
Capacity index (the capacity in kW multiplied by 10)
5
FA
Indoor unit type
FA: Fresh Air Processing Unit
6
D
Series category (D: DC series)
7
H
Power supply
Omit: 1 phase, 220-240V, 50Hz
H: 1 phase, 220-240V, 50/60Hz
8
N1
Refrigerant type (N1: R410A)
3.2 Heat recovery ventilator
AC Series
HRV
-
200
○
1
○
2
Legend
No.
Code
Remarks
1
HRV
Heat recovery ventilator
2
200
Airflow in m3/h
DC Series
HRV
-
D
200
○
1
○
2
○
3
Legend
No.
Code
Remarks
1
HRV
Heat recovery ventilator
2
D
Series category (D: DC series)
3
200
Airflow in m3/h

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Part 1 - General Information
3.3 Outdoor Units
MV
i
-
280
W
V2
R
N1
(A)
○
1
○
2
○
3
○
4
⑤
⑥
⑦
⑧
Legend
No.
Code
Remarks
1
MV
Midea VRF
2
i
Individual series
3
280
Capacity index (the capacity in kW multiplied by 10)
4
W
VRF outdoor unit
5
V2
All DC inverter
6
R
Power supply
R: 3 phase, 380-415V, 50Hz
7
N1
Refrigerant type (N1: R410A)
8
(A)
Product version code

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Midea V6-i Series Engineering Data Book
4Combination Ratio
Table 1-4.1: Indoor and outdoor unit combination ratio limitations
Type
Minimum
combination ratio
Maximum combination ratio
Standard indoor
units only
Fresh air processing
units only
Fresh air processing units and
standard indoor units together
V6-i Series outdoor units
50%
130%
100%
100%1
Notes:
1. When fresh air processing units are installed together with standard indoor units, the total capacity of the fresh air processing units must not exceed 30% of
the total capacity of the outdoor units and the combination ratio must not exceed 100%.
Table 1-4.2: Combinations of Indoor and outdoor units
Outdoor unit capacity
Sum of capacity indexes of
connected indoor units
(standard indoor units only)
Sum of capacity indexes of
connected indoor units
(fresh air processing units
and standard indoor units
together)
Maximum number of
connected indoor units
kW
HP
Capacity
index
20.0
7
200
100 to 260
100 to 200
10
22.4
8
224
112 to 291.2
126 to 224
13
26.0
9
260
130 to 338
130 to 260
15
28.0
10
280
140 to 364
140 to 280
16
33.5
12
335
167.5 to 435.5
167.5 to 335
20
Combination ratio =
Sum of capacity indexes of the indoor units
Capacity index of the outdoor unit

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Part 1 - General Information
5Selection Procedure
5.1 Procedure
Step 1: Establish design conditions
Step 2: Select indoor units
Step 3: Select outdoor unit
Notes:
1. If the indoor design temperature falls between two temperatures listed in the indoor unit's capacity table, calculate the corrected capacity by interpolation.
If the indoor unit selection is to be based on total heat load and sensible heat load, select indoor units which satisfy not only the total heat load requirements
of each room but also the sensible heat load requirements of each room. As with total heat capacity, the sensible heat capacity of indoor units should be
corrected for indoor temperature, interpolating where necessary. For the indoor unit capacity tables, refer to the indoor unit technical manuals.
Yes
Design temperature and humidity (indoor and outdoor)
Required heat load of each room
System peak load
Piping length, level differences
Indoor unit specifications (type and quantity)
Decide indoor unit safety factor
Select indoor unit models ensuring that:
Indoor unit capacity corrected for indoor air temperature WB1 ≥ Required heat load × Indoor unit safety factor
Determine required total heat load on the outdoor unit
Use the sum of the peak load of each room
Use the system peak load
Provisionally select outdoor unit capacity based on combination ratio limitations
Confirm that the number of indoor units connected to the outdoor unit is within limitation
Correct cooling and heating capacities of the outdoor unit for the following items:
Outdoor air temperature / Indoor air temperature WB / Combination ratio / Piping length, level difference
/ Piping heat loss / Frost accumulation (for heating capacity only)
Is corrected outdoor unit capacity ≥ Required total heat load on outdoor unit?
VRF system selection is complete
No

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Midea V6-i Series Engineering Data Book
5.2 Example
The following is a selection example based on total heat load for cooling.
Figure 1-5.1: Room plan
Room A
Room D
Room E
Room B
Room C
Step 1: Establish design conditions
Indoor air temperature 25°C DB, 18°C WB; outdoor air temperature 33°C DB.
Determine peak load of each room and system peak load. As shown in Table 1-5.1, the system peak load is 26.5kW.
Table 1-5.1: Required heat load of each room (kW)
Time
Room A
Room C
Room D
Room E
Room F
Total
9:00
9.1
3.0
3.0
2.9
2.9
20.9
12:00
7.4
5.1
5.1
4.0
4.0
25.6
14:00
9.3
4.5
4.5
4.1
4.1
26.5
16:00
8.3
3.9
3.9
3.8
3.8
23.7
The maximum piping lengths and level differences in this example are as given in Figure 1-5.2.
Figure 1-5.2: System diagram
Indoor unit type for all rooms: Medium Static Pressure Duct (T2).
Step 2: Select indoor units
In this example, a safety factor is not used (i.e. the safety factor is 1).
Select indoor unit models using the medium static pressure duct cooling capacity table. Each indoor unit's corrected
capacity needs to be greater than or equal to the peak load of the relevant room. The selected indoor units are shown
in Table 1-5.3.
Equivalent length of piping 60m
Level
difference
40m
Outdoor
Unit
Indoor
Unit
Indoor
Unit
Indoor
Unit
Indoor
Unit
Indoor
Unit

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Part 1 - General Information
Table 1-5.2: Extract from medium static pressure duct (T2) cooling capacity table
Model
Capacity
index
Indoor air temperature
14°C WB
16°C WB
18°C WB
19°C WB
20°C WB
22°C WB
24°C WB
20°C DB
23°C DB
26°C DB
27°C DB
28°C DB
30°C DB
32°C DB
TC
SHC
TC
SHC
TC
SHC
TC
SHC
TC
SHC
TC
SHC
TC
SHC
T2
22
1.5
1.4
1.8
1.5
2.1
1.6
2.2
1.6
2.3
1.7
2.4
1.5
2.4
1.5
28
1.9
1.7
2.3
1.9
2.6
2.1
2.8
2.1
3.0
2.1
3.1
2.0
3.1
1.9
36
2.5
2.1
2.9
2.3
3.4
2.5
3.6
2.6
3.8
2.7
4.2
2.8
3.9
2.3
45
3.1
2.6
3.7
2.8
4.2
3.1
4.5
3.2
4.8
3.2
4.9
3.1
5.1
2.9
56
3.9
3.0
4.6
3.3
5.3
3.6
5.6
3.7
5.9
3.8
6.2
3.7
6.2
3.4
71
4.9
3.9
5.8
4.3
6.7
4.7
7.1
4.9
7.5
4.8
7.8
4.6
7.8
4.3
80
5.5
4.4
6.6
4.9
7.5
5.3
8.0
5.5
8.4
5.5
8.8
5.2
8.8
4.8
90
6.2
5.3
7.3
5.8
8.4
6.3
9.0
6.4
9.6
6.5
9.9
6.1
9.9
5.7
112
7.7
6.4
9.1
7.1
10.5
7.7
11.2
7.8
11.9
8.1
12.5
7.8
12.5
7.4
140
9.7
7.8
11.3
8.6
13.2
9.6
14.0
9.8
14.8
9.8
15.7
9.7
15.4
8.8
Abbreviations:
TC: Total capacity (kW); SHC: Sensible heat capacity (kW)
Table 1-5.3: Selected indoor units
Room A
Room B
Room C
Room D
Room E
Peak heat load (kW)
9.3
5.1
5.1
4.1
4.1
Selected indoor unit
MI2-112T2DHN1
MI2-56T2DHN1
MI2-56T2DHN1
MI2-45T2DHN1
MI2-45T2DHN1
Corrected TC (kW)
10.5
5.3
5.3
4.2
4.2
Step 3: Select outdoor unit
Determine the required total heat load from the indoor units to the outdoor unit based on either the sum of the peak
loads of each room or the system peak load. In this example, it is determined based on the system peak load. Therefore,
the required heat load is 26.5kW.
Provisionally select an outdoor unit using the sum of the capacity indexes (CIs) of the selected indoor units (as shown
in Table 1-5.4), ensuring that the combination ratio is between 50% and 130%. Refer to Table 1-5.5. As the sum of CIs
of the indoor units is 314, outdoor units 9HP, 10HP and 12HP are potentially suitable. Start from the smaller, which is
the 9HP unit.
Table 1-5.4: Sum of indoor unit capacity indexes
Model
Capacity Index
No. of units
MI2-112T2DHN1
112
1
MI2-56T2DHN1
56
2
MI2-45T2DHN1
45
2
Sum of CIs
314

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Midea V6-i Series Engineering Data Book
Table 1-5.5: Combinations of Indoor and outdoor units
Outdoor unit capacity
Sum of capacity
indexes of
connected indoor
units (standard
indoor units only)
Maximum number
of connected
indoor units
kW
HP
Capacity
index
20.0
7
200
100 to 260
10
22.4
8
224
112 to 291.2
13
26.0
9
260
130 to 338
15
28.0
10
280
140 to 364
16
33.5
12
335
167.5 to 435.5
20
The number of connected indoor units is 5 and the maximum number of connected indoor units on the 9HP outdoor
unit is 12, so the number of connected indoor units is within the limitation.
Calculate the corrected capacity of the outdoor unit:
a) The sum of the indoor unit CIs is 314 and the CI of the 9HP outdoor unit (MVi-260WV2RN1(A)) is 260, so the
combination ratio is 314 / 260 = 121%.
b) Using the outdoor unit’s cooling capacity table, interpolate to obtain the capacity (“B”) corrected for outdoor air
temperature, indoor air temperature, and combination ratio. Refer to Tables 1-5.6 and 1-5.7.
Table 1-5.6: Extract from table 2-8.3 MVi-260WV2RN1(A)
cooling capacity
Table 1-5.7: Cooling capacity calculated by interpolation
CR
Outdoor
air
temp.
(°C DB)
Indoor air temp.
(°C DB / °C WB)
CR
Outdoor
air
temp.
(°C DB)
Indoor air temp.
(°C DB / °C WB)
25.8 / 18.0
25.8 / 18.0
TC
PI
TC
PI
kW
kW
kW
kW
130%
31
28.46
9.17
130%
33
28.03
9.52
33
28.03
9.52
35
27.61
9.89
B = 27.591
120%
31
27.95
8.88
120%
33
27.54
9.24
33
27.54
9.24
35
27.10
9.60
Notes:
1. 27.54 + (28.03 – 27.54) × (121 – 120) / (130 – 120) =
27.59

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Part 1 - General Information
c) Find the correction factor for piping length and level difference (“K1”)
Figure 1-5.3: V6-i rate of change in cooling capacity
Notes:
1. The horizontal axis shows equivalent length of piping between farthest indoor unit and first
outdoor branch joint; the vertical axis shows the largest level difference between indoor unit
and outdoor unit. For level differences, positive values indicate that the outdoor unit is above
the indoor unit, negative values indicate that the outdoor unit is below the indoor unit.
d) Calculate the corrected capacity of MVi-260WV2RN1(A) (“C”) by using K1:
C = B × K1 = 27.59 × 0.898 =24.77kW
The corrected capacity 24.77 kW is lower than required total heat load 26.5kW, so selection is not complete. Step 3
should be repeated from the point where the outdoor unit capacity is provisionally selected.
Repeat Step 3: Select outdoor unit
Determine the required total heat load from the indoor units to the outdoor unit based on either the sum of the peak
loads of each room or the system peak load. In this example, it is determined based on the system peak load. Therefore,
the required heat load is 26.5kW.
Provisionally select an outdoor unit using the sum of the capacity indexes (CIs) of the selected indoor units (as shown
in Table 1-5.4), ensuring that the combination ratio is between 50% and 130%. Refer to Table 1-5.5. As the sum of CIs
of the indoor units is 314, outdoor units 9-16HP are potentially suitable. For the 9HP unit is not suitable, try to select
10HP unit.
Table 1-5.8: Sum of indoor unit capacity indexes
Model
Capacity Index
No. of units
MI2-112T2DHN1
112
1
MI2-56T2DHN1
56
2
MI2-45T2DHN1
45
2
Sum of CIs
314
50
40
-40
30
-30
20
-20
10
1.0
0.97
0.95
0.92
0.90
0.87 0.85 0.84 0.81
1.0
0.97
0.95
0.92 0.90 0.87 0.85 0.84
10 20 30 40 50 60 70 80 90 100 110 120
-10
0
0
L(m)
H(m)

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Midea V6-i Series Engineering Data Book
Table 1-5.9: Combinations of Indoor and outdoor units
Outdoor unit capacity
Sum of capacity
indexes of
connected indoor
units (standard
indoor units only)
Maximum number
of connected
indoor units
kW
HP
Capacity
index
20.0
7
200
100 to 260
10
22.4
8
224
112 to 291.2
13
26.0
9
260
130 to 338
15
28.0
10
280
140 to 364
16
33.5
12
335
167.5 to 435.5
20
The number of connected indoor units is 5 and the maximum number of connected indoor units on the 10HP outdoor
unit is 16, so the number of connected indoor units is within the limitation.
Calculate the corrected capacity of the outdoor unit:
a) The sum of the indoor unit CIs is 314 and the CI of the 10HP outdoor unit (MVi-280WV2RN1(A)) is 280, so the
combination ratio is 314 / 280 = 112%.
b) Using the outdoor unit’s cooling capacity table, interpolate to obtain the capacity (“B”) corrected for outdoor air
temperature, indoor air temperature, and combination ratio. Refer to Tables 1-5.10 and 1-5.11.
Table 1-5.10: Extract from table 2-8.4 MVi-280WV2RN1(A)
cooling capacity
Table 1-5.11: Cooling capacity calculated by
interpolation
CR
Outdoor
air
temp.
(°C DB)
Indoor air temp.
(°C DB / °C WB)
CR
Outdoor
air
temp.
(°C DB)
Indoor air temp.
(°C DB / °C WB)
25.8 / 18.0
25.8 / 18.0
TC
PI
TC
PI
kW
kW
kW
kW
120%
31
30.64
10.82
120%
33
30.19
11.26
33
30.19
11.26
35
29.71
11.69
B = 30.011
110%
31
30.55
10.71
110%
33
29.96
11.33
33
29.96
11.33
35
29.46
11.76
Notes:
1. 29.96 + (30.19 – 29.96) × (112 – 110) / (120 – 110) =
30.01

V6-i VRF 50Hz
19
Part 1 - General Information
c) Find the correction factor for piping length and level difference (“K1”)
Figure 1-5.4: V6-i rate of change in cooling capacity
Notes:
1. The horizontal axis shows equivalent length of piping between farthest indoor unit and outdoor
unit; the vertical axis shows the largest level difference between indoor unit and outdoor unit.
For level differences, positive values indicate that the outdoor unit is above the indoor unit,
negative values indicate that the outdoor unit is below the indoor unit.
d) Calculate the corrected capacity of MVi-280WV2RN1(A) (“C”) by using K1:
C = B × K1 = 30.01 × 0.898 =26.95kW
The corrected capacity 26.95 kW is larger than required total heat load 26.5kW, so selection is complete.
50
40
-40
30
-30
20
-20
10
1.0
0.97
0.95
0.92
0.90
0.87 0.85 0.84 0.81
1.0
0.97
0.95
0.92 0.90 0.87 0.85 0.84
10 20 30 40 50 60 70 80 90 100 110 120
-10
0
0
L(m)
H(m)