Midea ATOM MDV-V28WDHN1 User manual

MDV-V28WDHN1(AtB)
MDV-V36WDHN1(AtB)
MDV-V42WDHN1(AtB)
MDV-V48WDHN1(AtB)
MDV-V56WDHN1(AtB)
Commercial Air Conditioners
R410A
Model:

Atom B Series VRF 50/60Hz
1
CONTENTS
CONTENTS
Part 1 General Information............................................................................3
Part 2 Outdoor Unit Engineering Data .......................................................13
Part 3 System Design and Installation........................................................ 68

Atom B Series VRF 50/60Hz
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Midea Atom B Series Engineering Data Book

Atom B Series VRF 50/60Hz
3
Part 1 – General Information
Part 1
General Information
1 Indoor and Outdoor Unit Capacities........................................................ 4
2 External Appearance............................................................................... 5
3 Nomenclature......................................................................................... 6
4 Combination Ratio .................................................................................. 7
5 Selection Procedure................................................................................ 8

Atom B Series VRF 50/60Hz
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Midea Atom B Series VRF Engineering Data Book
1Indoor and Outdoor Unit Capacities
1.1 Indoor Units
Table 1-1.1: Indoor unit abbreviation codes
Abbreviation code
Type
Q1
One-way Cassette
Q4C
Compact Four-way Cassette
Q4
Four-way Cassette
T2
Medium Static Pressure Duct
G
Wall-mounted
DL
Ceiling and Floor
Table 1-1.2: Indoor unit capacity range
Capacity
Capacity
index
Q1
Q4C
Q4
T2
G
DL
kBtu/h
kW
HP
6
1.8
0.6
6
6
—
—
—
—
7
2.2
0.8
7
7
7
—
7
7
9
2.8
1
9
9
9
9
9
9
12
3.6
1.25
12
12
12
12
12
12
12
15
4.5
1.6
15
15
15
15
15
15
15
18
5.6
2
18
18
—
18
18
18
18
24
7.1
2.5
24
24
—
24
24
24
24
28
8.0
3
28
—
—
28
28
28
28
32
9.0
3.2
32
—
—
32
32
32
32
36
10.0
3.6
36
—
—
36
—
—
36
40
11.2
4
40
—
—
40
40
—
40
48
14.0
5
48
—
—
48
48
—
48
56
16.0
6
56
—
—
56(DC)
56
—
Notes:
1. Atom series indoor units could connect to Atom series outdoor units.
1.2 Outdoor Units
Table 1-1.3: Outdoor unit capacity range
Capacity (kBtu/h)
Model Name
28
MDV-V28WDHN1(AtB)
36
MDV-V36WDHN1(AtB)
42
MDV-V42WDHN1(AtB)
48
MDV-V48WDHN1(AtB)
56
MDV-V56WDHN1(AtB)
Notes:
1. Atom series outdoor units could not be combined.

Atom B Series VRF 50/60Hz
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Part 1 –
General Information
2External Appearance
2.1 Indoor Units
Table 1-2.1: Indoor unit appearance
One-way Cassette
Four-way Cassette
Q1
Q4
Compact Four-way Cassette
Wall-mounted
Q4C G
Medium Static Pressure Duct
Ceiling and Floor
T2
DL
2.2 Outdoor Units
Table 1-2.2: Outdoor unit appearance
28kBtu/h
36/42/48/56kBtu/h

Atom B Series VRF 50/60Hz
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Midea Atom B Series VRF Engineering Data Book
3Nomenclature
3.1 Indoor Units
MDV
-
D
09
Q4
/
N1
-
E
(At)
①
②
③
④
⑤
⑥
⑦
Legend
No.
Code
Remarks
1
MDV
Midea VRF
2
D
VRF indoor unit
3
09
Capacity index (the capacity in kBtu/h)
4
Q4
Indoor unit type
Q1: One-way Cassette
Q4C: Compact Four-way Cassette
Q4: Four-way Cassette
T2: Medium Static Pressure Duct
G: Wall Mounted
DL: Ceiling and Floor
5
N1
Refrigerant type (N1: R410A)
6
E
Design code
7
At
Atom series
3.2 Outdoor Units
MDV
-
V
28
W
D
H
N1
(AtB)
①
②
③
④
⑤
⑥
⑦
⑧
Legend
No.
Code
Remarks
1
MDV
Midea VRF
2
V
All DC inverter
3
28
Capacity index (the capacity in kBtu/h)
4
W
VRF outdoor unit
5
D
DC inverter compressor
6
H
Power supply
Omit: 1 phase, 220-240V, 50Hz
H: 1 phase, 220-240V, 50/60Hz
7
N1
Refrigerant type (N1: R410A)
8
AtB
Atom B series

Atom B Series VRF 50/60Hz
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Part 1 –
General Information
4Combination Ratio
Table 1-4.1: Indoor and outdoor unit combination ratio limitations
Type Minimum combination ratio Maximum combination ratio
Atom Series outdoor units
45%
130%
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)
Number of connected
indoor units
kBtu/h
Capacity
index
28 28 12.6 to 36.4 1-4
36 36 16.2 to 46.8 1-6
42 42 18.9 to 54.6 1-7
48 48 21.6 to 62.4 1-8
56 56 25.2 to 72.8 1-9
Combination ratio = Sum of capacity indexes of the indoor units
Capacity index of the outdoor unit

Atom B Series VRF 50/60Hz
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Midea Atom B Series VRF Engineering Data Book
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

Atom B Series VRF 50/60Hz
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Part 1 –
General Information
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 B
Room C
Room D
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 10.5kW.
Table 1-5.1: Required heat load of each room (kW)
Time Room A Room BRoom CRoom DTotal
9:00 2.5 1.6 1.6 1.6 7.3
12:00 3.2 2.4 2.4 2.4 10.4
14:00 3.1 2.4 2.4 2.6 10.5
16:00 3.1 2.3 2.3 2.3 10
 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 20m
Level
difference
10m
Outdoor
Unit
Indoor
Unit
Indoor
Unit
Indoor
Unit
Indoor
Unit