Midea ATOM MDV-V28WDHN1 Manual de usuario

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

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

Midea Atom B Series Engineering Data Book

Atom B Series VRF 50/60Hz

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

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

One-way Cassette

Q4C

Compact Four-way Cassette

Four-way Cassette

Medium Static Pressure Duct

Wall-mounted

Ceiling and Floor

Table 1-1.2: Indoor unit capacity range

Capacity

index

Q4C

kBtu/h

1.8

0.6

—

2.2

0.8

—

2.8

3.6

1.25

4.5

1.6

5.6

—

7.1

2.5

—

8.0

—

9.0

3.2

—

10.0

3.6

—

11.2

—

14.0

—

16.0

—

56(DC)

—

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

MDV-V28WDHN1(AtB)

MDV-V36WDHN1(AtB)

MDV-V42WDHN1(AtB)

MDV-V48WDHN1(AtB)

MDV-V56WDHN1(AtB)

Notes:

1. Atom series outdoor units could not be combined.

Atom B Series VRF 50/60Hz

Part 1 –

General Information

2External Appearance

2.1 Indoor Units

Table 1-2.1: Indoor unit appearance

One-way Cassette

Four-way Cassette

Compact Four-way Cassette

Wall-mounted

Q4C

Medium Static Pressure Duct

Ceiling and Floor

2.2 Outdoor Units

Table 1-2.2: Outdoor unit appearance

28kBtu/h

36/42/48/56kBtu/h

Atom B Series VRF 50/60Hz

Midea Atom B Series VRF Engineering Data Book

3Nomenclature

3.1 Indoor Units

MDV

(At)

①

②

③

④

⑤

⑥

⑦

Legend

No.

Code

Remarks

MDV

Midea VRF

VRF indoor unit

Capacity index (the capacity in kBtu/h)

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

Refrigerant type (N1: R410A)

Design code

Atom series

3.2 Outdoor Units

MDV

(AtB)

①

②

③

④

⑤

⑥

⑦

⑧

Legend

No.

Code

Remarks

MDV

Midea VRF

All DC inverter

Capacity index (the capacity in kBtu/h)

VRF outdoor unit

DC inverter compressor

Power supply

Omit: 1 phase, 220-240V, 50Hz

H: 1 phase, 220-240V, 50/60Hz

Refrigerant type (N1: R410A)

AtB

Atom B series

Atom B Series VRF 50/60Hz

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

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

Atom B Series VRF 50/60Hz

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

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