Midea ATOM MDV-V28WDHN1 Manual
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Midea ATOM MDV-V28WDHN1 Manual

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

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Summary of Contents for Midea ATOM MDV-V28WDHN1

  • Page 1 R410A Commercial Air Conditioners Model: MDV-V28WDHN1(AtB) MDV-V36WDHN1(AtB) MDV-V42WDHN1(AtB) MDV-V48WDHN1(AtB) MDV-V56WDHN1(AtB)
  • Page 2 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...
  • Page 3 Atom B Series VRF 50/60Hz...

  • Page 4: Table Of Contents

    Atom B Series VRF 50/60Hz 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...

  • Page 5: Indoor And Outdoor Unit Capacities

    Atom B Series VRF 50/60Hz 1 Indoor and Outdoor Unit Capacities 1.1 Indoor Units Table 1-1.1: Indoor unit abbreviation codes Abbreviation code Type One-way Cassette 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 Capacity index...

  • Page 6: External Appearance

    Atom B Series VRF 50/60Hz 2 External Appearance 2.1 Indoor Units Table 1-2.1: Indoor unit appearance One-way Cassette Four-way Cassette Compact Four-way Cassette Wall-mounted 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...

  • Page 7: Nomenclature

    ② ③ ④ ⑤ ⑥ ⑦ Legend Code Remarks 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...

  • Page 8: Combination Ratio

    Atom B Series VRF 50/60Hz 4 Combination Ratio Sum of capacity indexes of the indoor units Combination ratio = Capacity index of the outdoor unit Table 1-4.1: Indoor and outdoor unit combination ratio limitations Type Minimum combination ratio Maximum combination ratio Atom Series outdoor units 130% Table 1-4.2: Combinations of Indoor and outdoor units...

  • Page 9: Selection Procedure

    Atom B Series VRF 50/60Hz 5 Selection Procedure 5.1 Procedure Step 1: Establish design conditions 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) Step 2: Select indoor units Decide indoor unit safety factor Select indoor unit models ensuring that:...
  • Page 10 Atom B Series VRF 50/60Hz 5.2 Example The following is a selection example based on total heat load for cooling. Figure 1-5.1: Room plan Room B Room C Room A Room D Step 1: Establish design conditions  Indoor air temperature 25°C DB, 18°C WB; outdoor air temperature 33°C DB. ...
  • Page 11 Atom B Series VRF 50/60Hz Table 1-5.2: Extract from medium static pressure duct (T2) cooling capacity table Indoor air temperature Capacity 14°C WB 16°C WB 18°C WB 19°C WB 20°C WB 22°C WB 24°C WB index Model 20°C DB 23°C DB 26°C DB 27°C DB 28°C DB...
  • Page 12 Atom B Series VRF 50/60Hz  The number of connected indoor units is 4 and the maximum number of connected indoor units on the 10kW outdoor unit is 6, so the number of connected indoor units is within the limitation. ...
  • Page 13 Atom B Series VRF 50/60Hz  Provisionally select an outdoor unit using the sum of the capacity indexes (CIs) of the selected indoor units (as shown in Table 1-5.5), ensuring that the combination ratio is between 50% and 130%. Refer to Table 1-5.6. As the sum of CIs of the indoor units is 120.
  • Page 14 Atom B Series VRF 50/60Hz Part 2 Outdoor Unit Engineering Data 1 Specifications ..................14 2 Dimensions ................... 15 3 Installation Space Requirements ............17 4 Piping Diagrams ..................18 5 Wiring Diagrams ..................20 6 Electrical Characteristics ................ 22 7 Capacity Tables ..................

  • Page 15: Specifications

    Atom B Series VRF 50/60Hz 1 Specifications MDV-V28WDHN1(AtB) / MDV-V36WDHN1(AtB) / MDV-V42WDHN1(AtB) Table 2-1.1: 28/36/42 model specifications Model MDV-V28WDHN1(AtB) MDV-V36WDHN1(AtB) MDV-V42WDHN1(AtB) Power supply V-Ph-Hz 220-240/1/ 50(60) kBtu/h Capacity Cooling Input 2.66 3.31 kW/ KW 3.81 3.76 3.63 kBtu/h Capacity Heating Input 2.04 3.15...
  • Page 16 Atom B Series VRF 50/60Hz MDV-V48WDHN1(AtB) / MDV-V56WDHN1(AtB) Table 2-1.2: 48/52 model specifications Model MDV-V48WDHN1(AtB) MDV-V56WDHN1(AtB) Power supply V-Ph-Hz 220-240/1/ 50(60) kBtu/h Capacity 15.5 Cooling Input 3.97 4.87 kW/ KW 3.53 3.18 kBtu/h Capacity Heating Input 3.98 4.82 kW/ kW 4.02 3.73 Total capacity...

  • Page 17: Dimensions

    Atom B Series VRF 50/60Hz 2 Dimensions (unit: mm) Figure 2-2.1: Model 28 Front view dimensions Figure 2-2.2: Model 28 Top view dimensions Figure 2-2.3: Model 36-56 Front view dimensions Figure 2-2.4: Model 36-56 Top view dimensions Model 36/42/48/56...

  • Page 18: Installation Space Requirements

    Atom B Series VRF 50/60Hz 3 Installation Space Requirements Figure 2-3.1: Single unit installation top view (unit: mm) Figure 2-3.2: Single unit installation side view (unit: mm) Figure 2-3.3: Multiple unit installation top view (unit: mm) Figure 2-3.4: Multiple unit installation side view (unit: mm)

  • Page 19: Piping Diagrams

    Atom B Series VRF 50/60Hz 4 Piping Diagrams Figure 2-4.1: 28 model Piping diagram Gas pipe Liquid pipe Filter Temperature sensor Low pressure switch Temperature 4 way valve sensor Oil seperator Refrigerant Compressor radiator module return Temperature hole sensor Distributor Temperature sensor Accumulator...
  • Page 20 Atom B Series VRF 50/60Hz Figure 2-4.2: 42 model Piping diagram Gas pipe Liquid pipe Filter Temperature sensor Low pressure switch Temperature 4 way valve sensor Oil seperator Refrigerant Compressor radiator module Temperature sensor High pressure Temperatu re senso r switch Distributor Accumulator...

  • Page 21: Wiring Diagrams

    Atom B Series VRF 50/60Hz 5 Wiring Diagrams Figure 2-5.1: 28 model wiring diagram Component code Description Component code Description CH1-CH4 Magnetic ring STF1 Four-way valve COMP Compressor Refrigerant radiator temperature sensor EEV1 Electronic expansion valve Power supply terminal DC fan Outdoor heat exchanger temperature sensor HEAT1 Crankcase heater...
  • Page 22 Atom B Series VRF 50/60Hz Figure 2-5.2: 36/42/48/56 model wiring diagram Component code Description Component code Description Rectifier bridge stacking Relay CH1-CH7 Magnetic ring STF1 Four-way valve COMP. Compressor Outdoor heat exchanger temperature sensor AC current transformer Outdoor ambient temperature sensor D501-D503 Fast-recovery diode Discharge temperature sensor...

  • Page 23: Electrical Characteristics

    Atom B Series VRF 50/60Hz 6 Electrical Characteristics Table 2-6.1: Outdoor unit electrical characteristics Power Supply Compressor Model Min. Max. Volts TOCA volts volts MDV-V28WDHN1(AtB) 50/60Hz 220-240 21.25 18.1 Soft start 9.45 0.08 MDV-V36WDHN1(AtB) 50/60Hz 220-240 28.75 Soft start 9.45 0.17 1.52 MDV-V42WDHN1(AtB)

  • Page 24: Capacity Tables

    Atom B Series VRF 50/60Hz 7 Capacity Tables 7.1 Cooling Capacity Tables Table 2-7.1: MDV-V28WDHN1(AtB) cooling capacity Indoor temperature(°C DB/WB) Combination Outdoor DB:20.8,WB:14 DB:23.3,WB:16 DB:25.8,WB:18 DB:27,WB:19 DB:28.2,WB:20 DB:30.7,WB:22 DB:32,WB:24 (%) (Capacity temperature index) (°C DB) -5.0 10.2 -2.0 10.2 10.2 10.2 10.2 10.2...
  • Page 25 Atom B Series VRF 50/60Hz Table 2-7.1: MDV-V28WDHN1(AtB) cooling capacity (continued) Indoor temperature(°C DB/WB) Combination Outdoor DB:20.8,WB:14 DB:23.3,WB:16 DB:25.8,WB:18 DB:27,WB:19 DB:28.2,WB:20 DB:30.7,WB:22 DB:32,WB:24 (%) (Capacity temperature index) (°C DB) -5.0 -2.0 10.0 12.0 14.0 16.0 18.0 20.0 21.0 23.0 110% 25.0 27.0 29.0...
  • Page 26 Atom B Series VRF 50/60Hz Table 2-7.1: MDV-V28WDHN1(AtB) cooling capacity (continued) Indoor temperature(°C DB/WB) Combination Outdoor DB:20.8,WB:14 DB:23.3,WB:16 DB:25.8,WB:18 DB:27,WB:19 DB:28.2,WB:20 DB:30.7,WB:22 DB:32,WB:24 (%) (Capacity temperature index) (°C DB) -5.0 -2.0 10.0 12.0 14.0 16.0 18.0 20.0 21.0 23.0 25.0 27.0 29.0 31.0...
  • Page 27 Atom B Series VRF 50/60Hz Table 2-7.1: MDV-V28WDHN1(AtB) cooling capacity (continued) Indoor temperature(°C DB/WB) Combination Outdoor DB:20.8,WB:14 DB:23.3,WB:16 DB:25.8,WB:18 DB:27,WB:19 DB:28.2,WB:20 DB:30.7,WB:22 DB:32,WB:24 (%) (Capacity temperature index) (°C DB) -5.0 -2.0 10.0 12.0 14.0 16.0 18.0 20.0 21.0 23.0 25.0 27.0 29.0 31.0...
  • Page 28 Atom B Series VRF 50/60Hz Table 2-7.1: MDV-V28WDHN1(AtB) cooling capacity (continued) Indoor temperature(°C DB/WB) Combination Outdoor DB:20.8,WB:14 DB:23.3,WB:16 DB:25.8,WB:18 DB:27,WB:19 DB:28.2,WB:20 DB:30.7,WB:22 DB:32,WB:24 (%) (Capacity temperature index) (°C DB) -5.0 -2.0 10.0 12.0 14.0 16.0 18.0 20.0 21.0 23.0 25.0 27.0 29.0 31.0...
  • Page 29 Atom B Series VRF 50/60Hz Table 2-7.2: MDV-V36WDHN1(AtB) cooling capacity Indoor temperature(°C DB/WB) Combination Outdoor DB:20.8,WB:14 DB:23.3,WB:16 DB:25.8,WB:18 DB:27,WB:19 DB:28.2,WB:20 DB:30.7,WB:22 DB:32,WB:24 (%) (Capacity temperature index) (°C DB) -5.0 10.5 11.3 11.9 12.7 -2.0 10.5 11.3 11.9 12.7 10.5 11.3 11.9 12.7 10.5...
  • Page 30 Atom B Series VRF 50/60Hz Table 2-7.2: MDV-V36WDHN1(AtB) cooling capacity (continued) Indoor temperature(°C DB/WB) Combination Outdoor DB:20.8,WB:14 DB:23.3,WB:16 DB:25.8,WB:18 DB:27,WB:19 DB:28.2,WB:20 DB:30.7,WB:22 DB:32,WB:24 (%) (Capacity temperature index) (°C DB) -5.0 10.1 10.9 11.4 12.2 -2.0 10.1 10.9 11.4 12.2 10.1 10.9 11.4 12.2...
  • Page 31 Atom B Series VRF 50/60Hz Table 2-7.2: MDV-V36WDHN1(AtB) cooling capacity (continued) Indoor temperature(°C DB/WB) Combination Outdoor DB:20.8,WB:14 DB:23.3,WB:16 DB:25.8,WB:18 DB:27,WB:19 DB:28.2,WB:20 DB:30.7,WB:22 DB:32,WB:24 (%) (Capacity temperature index) (°C DB) -5.0 10.2 10.9 -2.0 10.2 10.9 10.2 10.9 10.2 10.9 10.2 10.9 10.2 10.9...
  • Page 32 Atom B Series VRF 50/60Hz Table 2-7.2: MDV-V36WDHN1(AtB) cooling capacity (continued) Indoor temperature(°C DB/WB) Combination Outdoor DB:20.8,WB:14 DB:23.3,WB:16 DB:25.8,WB:18 DB:27,WB:19 DB:28.2,WB:20 DB:30.7,WB:22 DB:32,WB:24 (%) (Capacity temperature index) (°C DB) -5.0 -2.0 10.0 12.0 14.0 16.0 18.0 20.0 21.0 23.0 25.0 27.0 29.0 31.0...
  • Page 33 Atom B Series VRF 50/60Hz Table 2-7.2: MDV-V36WDHN1(AtB) cooling capacity (continued) Indoor temperature(°C DB/WB) Combination Outdoor DB:20.8,WB:14 DB:23.3,WB:16 DB:25.8,WB:18 DB:27,WB:19 DB:28.2,WB:20 DB:30.7,WB:22 DB:32,WB:24 (%) (Capacity temperature index) (°C DB) -5.0 -2.0 10.0 12.0 14.0 16.0 18.0 20.0 21.0 23.0 25.0 27.0 29.0 31.0...
  • Page 34 Atom B Series VRF 50/60Hz Table 2-7.3: MDV-V42WDHN1(AtB) cooling capacity Indoor temperature(°C DB/WB) Combination Outdoor DB:20.8,WB:14 DB:23.3,WB:16 DB:25.8,WB:18 DB:27,WB:19 DB:28.2,WB:20 DB:30.7,WB:22 DB:32,WB:24 (%) (Capacity temperature index) (°C DB) -5.0 10.1 11.3 12.6 13.6 14.2 15.2 -2.0 10.1 11.3 12.6 13.6 14.2 15.2 10.1...
  • Page 35 Atom B Series VRF 50/60Hz Table 2-7.3: MDV-V42WDHN1(AtB) cooling capacity (continued) Indoor temperature(°C DB/WB) Combination Outdoor DB:20.8,WB:14 DB:23.3,WB:16 DB:25.8,WB:18 DB:27,WB:19 DB:28.2,WB:20 DB:30.7,WB:22 DB:32,WB:24 (%) (Capacity temperature index) (°C DB) -5.0 10.9 12.1 13.1 13.7 14.7 -2.0 10.9 12.1 13.1 13.7 14.7 10.9 12.1...
  • Page 36 Atom B Series VRF 50/60Hz Table 2-7.3: MDV-V42WDHN1(AtB) cooling capacity (continued) Indoor temperature(°C DB/WB) Combination Outdoor DB:20.8,WB:14 DB:23.3,WB:16 DB:25.8,WB:18 DB:27,WB:19 DB:28.2,WB:20 DB:30.7,WB:22 DB:32,WB:24 (%) (Capacity temperature index) (°C DB) -5.0 10.8 11.6 12.2 13.1 -2.0 10.8 11.6 12.2 13.1 10.8 11.6 12.2 13.1...
  • Page 37 Atom B Series VRF 50/60Hz Table 2-7.3: MDV-V42WDHN1(AtB) cooling capacity (continued) Indoor temperature(°C DB/WB) Combination Outdoor DB:20.8,WB:14 DB:23.3,WB:16 DB:25.8,WB:18 DB:27,WB:19 DB:28.2,WB:20 DB:30.7,WB:22 DB:32,WB:24 (%) (Capacity temperature index) (°C DB) -5.0 10.2 -2.0 10.2 10.2 10.2 10.2 10.2 10.2 10.0 10.2 12.0 10.2 14.0...
  • Page 38 Atom B Series VRF 50/60Hz Table 2-7.3: MDV-V42WDHN1(AtB) cooling capacity (continued) Indoor temperature(°C DB/WB) Combination Outdoor DB:20.8,WB:14 DB:23.3,WB:16 DB:25.8,WB:18 DB:27,WB:19 DB:28.2,WB:20 DB:30.7,WB:22 DB:32,WB:24 (%) (Capacity temperature index) (°C DB) -5.0 -2.0 10.0 12.0 14.0 16.0 18.0 20.0 21.0 23.0 25.0 27.0 29.0 31.0...
  • Page 39 Atom B Series VRF 50/60Hz Table 2-7.4: MDV-V48WDHN1(AtB) cooling capacity Indoor temperature(°C DB/WB) Combination Outdoor DB:20.8,WB:14 DB:23.3,WB:16 DB:25.8,WB:18 DB:27,WB:19 DB:28.2,WB:20 DB:30.7,WB:22 DB:32,WB:24 (%) (Capacity temperature index) (°C DB) -5.0 10.3 11.8 13.2 14.7 15.8 16.6 17.8 -2.0 10.3 11.8 13.2 14.7 15.8 16.6...
  • Page 40 Atom B Series VRF 50/60Hz Table 2-7.4: MDV-V48WDHN1(AtB) cooling capacity (continued) Indoor temperature(°C DB/WB) Combination Outdoor DB:20.8,WB:14 DB:23.3,WB:16 DB:25.8,WB:18 DB:27,WB:19 DB:28.2,WB:20 DB:30.7,WB:22 DB:32,WB:24 (%) (Capacity temperature index) (°C DB) -5.0 11.3 12.7 14.1 15.2 16.0 17.1 -2.0 11.3 12.7 14.1 15.2 16.0 17.1...
  • Page 41 Atom B Series VRF 50/60Hz Table 2-7.4: MDV-V48WDHN1(AtB) cooling capacity (continued) Indoor temperature(°C DB/WB) Combination Outdoor DB:20.8,WB:14 DB:23.3,WB:16 DB:25.8,WB:18 DB:27,WB:19 DB:28.2,WB:20 DB:30.7,WB:22 DB:32,WB:24 (%) (Capacity temperature index) (°C DB) -5.0 10.1 11.3 12.6 13.6 14.2 15.2 -2.0 10.1 11.3 12.6 13.6 14.2 15.2...
  • Page 42 Atom B Series VRF 50/60Hz Table 2-7.4: MDV-V48WDHN1(AtB) cooling capacity (continued) Indoor temperature(°C DB/WB) Combination Outdoor DB:20.8,WB:14 DB:23.3,WB:16 DB:25.8,WB:18 DB:27,WB:19 DB:28.2,WB:20 DB:30.7,WB:22 DB:32,WB:24 (%) (Capacity temperature index) (°C DB) -5.0 10.6 11.1 11.9 -2.0 10.6 11.1 11.9 10.6 11.1 11.9 10.6 11.1 11.9...
  • Page 43 Atom B Series VRF 50/60Hz Table 2-7.4: MDV-V48WDHN1(AtB) cooling capacity (continued) Indoor temperature(°C DB/WB) Combination Outdoor DB:20.8,WB:14 DB:23.3,WB:16 DB:25.8,WB:18 DB:27,WB:19 DB:28.2,WB:20 DB:30.7,WB:22 DB:32,WB:24 (%) (Capacity temperature index) (°C DB) -5.0 -2.0 10.0 12.0 14.0 16.0 18.0 20.0 21.0 23.0 25.0 27.0 29.0 31.0...
  • Page 44 Atom B Series VRF 50/60Hz Table 2-7.5: MDV-V56WDHN1(AtB) cooling capacity Indoor temperature(°C DB/WB) Combination Outdoor DB:20.8,WB:14 DB:23.3,WB:16 DB:25.8,WB:18 DB:27,WB:19 DB:28.2,WB:20 DB:30.7,WB:22 DB:32,WB:24 (%) (Capacity temperature index) (°C DB) -5.0 11.4 13.0 14.6 16.3 17.5 18.4 19.7 -2.0 11.4 13.0 14.6 16.3 17.5 18.4...
  • Page 45 Atom B Series VRF 50/60Hz Table 2-7.5: MDV-V56WDHN1(AtB) cooling capacity (continued) Indoor temperature(°C DB/WB) Combination Outdoor DB:20.8,WB:14 DB:23.3,WB:16 DB:25.8,WB:18 DB:27,WB:19 DB:28.2,WB:20 DB:30.7,WB:22 DB:32,WB:24 (%) (Capacity temperature index) (°C DB) -5.0 11.0 12.5 14.1 15.7 16.9 17.7 18.9 -2.0 11.0 12.5 14.1 15.7 16.9...
  • Page 46 Atom B Series VRF 50/60Hz Table 2-7.5: MDV-V56WDHN1(AtB) cooling capacity (continued) Indoor temperature(°C DB/WB) Combination Outdoor DB:20.8,WB:14 DB:23.3,WB:16 DB:25.8,WB:18 DB:27,WB:19 DB:28.2,WB:20 DB:30.7,WB:22 DB:32,WB:24 (%) (Capacity temperature index) (°C DB) -5.0 11.2 12.6 14.0 15.0 15.8 16.9 -2.0 11.2 12.6 14.0 15.0 15.8 16.9...
  • Page 47 Atom B Series VRF 50/60Hz Table 2-7.5: MDV-V56WDHN1(AtB) cooling capacity (continued) Indoor temperature(°C DB/WB) Combination Outdoor DB:20.8,WB:14 DB:23.3,WB:16 DB:25.8,WB:18 DB:27,WB:19 DB:28.2,WB:20 DB:30.7,WB:22 DB:32,WB:24 (%) (Capacity temperature index) (°C DB) -5.0 10.9 11.7 12.3 13.1 -2.0 10.9 11.7 12.3 13.1 10.9 11.7 12.3 13.1...
  • Page 48 Atom B Series VRF 50/60Hz Table 2-7.5: MDV-V56WDHN1(AtB) cooling capacity (continued) Indoor temperature(°C DB/WB) Combination Outdoor DB:20.8,WB:14 DB:23.3,WB:16 DB:25.8,WB:18 DB:27,WB:19 DB:28.2,WB:20 DB:30.7,WB:22 DB:32,WB:24 (%) (Capacity temperature index) (°C DB) -5.0 -2.0 10.0 12.0 14.0 16.0 18.0 20.0 21.0 23.0 25.0 27.0 29.0 31.0...
  • Page 49 Atom B Series VRF 50/60Hz 7.2 Heating Capacity Tables Table 2-7.6: MDV-V28WDHN1(AtB) heating capacity Indoor air temp. °C DB Outdoor air temp. °C DB °C WB -13.7 7.66 1.85 7.64 1.89 7.61 1.97 7.61 2.03 7.58 2.08 7.55 2.11 -11.8 7.78 1.88 7.75...
  • Page 50 Atom B Series VRF 50/60Hz Table 2-7.6: MDV-V28WDHN1(AtB) heating capacity (continued) Indoor air temp. °C DB Outdoor air temp. °C DB °C WB -13.7 7.71 2.44 7.69 2.47 7.69 2.49 7.66 2.50 7.66 2.52 7.63 2.45 -11.8 7.83 2.44 7.80 2.47 7.80 2.50...
  • Page 51 Atom B Series VRF 50/60Hz Table 2-7.6: MDV-V28WDHN1(AtB) heating capacity (continued) Indoor air temp. °C DB Outdoor air temp. °C DB °C WB -13.7 7.26 2.35 6.78 2.16 6.31 2.13 6.06 2.08 5.83 2.05 5.34 1.97 -11.8 7.26 2.30 6.78 2.12 6.31 2.10...
  • Page 52 Atom B Series VRF 50/60Hz Table 2-7.7: MDV-V36WDHN1(AtB) heating capacity Indoor air temp. °C DB Outdoor air temp. °C DB °C WB -13.7 10.21 2.85 10.19 2.93 10.15 3.06 10.15 3.14 10.11 3.21 10.07 3.25 -11.8 10.37 2.90 10.33 2.99 10.29 3.11 10.29...
  • Page 53 Atom B Series VRF 50/60Hz Table 2-7.7: MDV-V36WDHN1(AtB) heating capacity (continued) Indoor air temp. °C DB Outdoor air temp. °C DB °C WB -13.7 10.28 3.76 10.25 3.80 10.25 3.85 10.21 3.86 10.21 3.89 10.17 3.79 -11.8 10.44 3.77 10.40 3.82 10.40 3.85...
  • Page 54 Atom B Series VRF 50/60Hz Table 2-7.7: MDV-V36WDHN1(AtB) heating capacity (continued) Indoor air temp. °C DB Outdoor air temp. °C DB °C WB -13.7 9.68 3.63 9.03 3.34 8.41 3.28 8.08 3.22 7.77 3.18 7.12 3.05 -11.8 9.68 3.55 9.03 3.28 8.41 3.22...
  • Page 55 Atom B Series VRF 50/60Hz Table 2-7.8: MDV-V42WDHN1(AtB) heating capacity Indoor air temp. °C DB Outdoor air temp. °C DB °C WB -13.7 11.92 3.30 11.88 3.39 11.83 3.53 11.83 3.62 11.79 3.71 11.75 3.77 -11.8 12.10 3.35 12.06 3.44 12.01 3.59 12.01...
  • Page 56 Atom B Series VRF 50/60Hz Table 2-7.8: MDV-V42WDHN1(AtB) heating capacity (continued) Indoor air temp. °C DB Outdoor air temp. °C DB °C WB -13.7 12.00 4.35 11.96 4.40 11.96 4.44 11.91 4.47 11.91 4.49 11.87 4.39 -11.8 12.18 4.35 12.13 4.41 12.13 4.46...
  • Page 57 Atom B Series VRF 50/60Hz Table 2-7.8: MDV-V42WDHN1(AtB) heating capacity (continued) Indoor air temp. °C DB Outdoor air temp. °C DB °C WB -13.7 11.29 4.19 10.53 3.86 9.82 3.80 9.42 3.72 9.07 3.66 8.31 3.51 -11.8 11.29 4.11 10.53 3.79 9.82 3.73...
  • Page 58 Atom B Series VRF 50/60Hz Table 2-7.9: MDV-V48WDHN1(AtB) heating capacity Indoor air temp. °C DB Outdoor air temp. °C DB °C WB -13.7 13.63 3.61 13.58 3.71 13.52 3.86 13.52 3.96 13.47 4.06 13.42 4.12 -11.8 13.83 3.67 13.78 3.77 13.73 3.93 13.73...
  • Page 59 Atom B Series VRF 50/60Hz Table 2-7.9: MDV-V48WDHN1(AtB) heating capacity (continued) Indoor air temp. °C DB Outdoor air temp. °C DB °C WB -13.7 13.71 4.76 13.66 4.81 13.66 4.86 13.61 4.89 13.61 4.92 13.56 4.79 -11.8 13.92 4.76 13.87 4.82 13.87 4.87...
  • Page 60 Atom B Series VRF 50/60Hz Table 2-7.9: MDV-V48WDHN1(AtB) heating capacity (continued) Indoor air temp. °C DB Outdoor air temp. °C DB °C WB -13.7 12.90 4.58 12.04 4.22 11.23 4.15 10.77 4.07 10.36 4.01 9.50 3.84 -11.8 12.90 4.50 12.04 4.15 11.23 4.08...
  • Page 61 Atom B Series VRF 50/60Hz Table 2-7.10: MDV-V56WDHN1(AtB) heating capacity Indoor air temp. °C DB Outdoor air temp. °C DB °C WB -13.7 15.33 4.37 15.27 4.48 15.22 4.68 15.22 4.79 15.16 4.92 15.10 4.98 -11.8 15.56 4.44 15.50 4.56 15.44 4.76 15.44...
  • Page 62 Atom B Series VRF 50/60Hz Table 2-7.10: MDV-V56WDHN1(AtB) heating capacity (continued) Indoor air temp. °C DB Outdoor air temp. °C DB °C WB -13.7 15.43 5.77 15.37 5.82 15.37 5.89 15.31 5.92 15.31 5.95 15.26 5.81 -11.8 15.66 5.77 15.60 5.83 15.60 5.89...
  • Page 63 Atom B Series VRF 50/60Hz Table 2-7.10: MDV-V56WDHN1(AtB) heating capacity (continued) Indoor air temp. °C DB Outdoor air temp. °C DB °C WB -13.7 14.51 5.55 13.54 5.12 12.63 5.02 12.11 4.92 11.66 4.85 10.69 4.65 -11.8 14.51 5.44 13.54 5.01 12.63 4.94...
  • Page 64 Atom B Series VRF 50/60Hz 7.3 Capacity Correction Factors for Piping Length and Level Difference Figure 2-7.1: 28 model rate of change in cooling capacity Figure 2-7.2: 28 model rate of change in heating capacity Figure 2-7.3: 36/42 model rate of change in cooling capacity Figure 2-7.4: 36/42 model rate of change in heating capacity Figure 2-7.5: 48/56 model rate of change in cooling capacity Figure 2-7.6: 48/56 model rate of change in heating capacity...

  • Page 65: Operating Limits

    Atom B Series VRF 50/60Hz 8 Operating Limits Figure 2-8.1: Operating limits Coolinging operation ° 12 17 22 27 32 37 ° C WB Indoor temperature( Table 2-8.1: Operating limits Mode Outdoor temperature Room temperature Cooling operation -5℃～55℃ 17℃～32℃ Heating operating -15℃～27℃...

  • Page 66: Sound Levels

    Atom B Series VRF 50/60Hz 9 Sound Levels 9.1 Overall Table 2-9.1: Sound pressure level Model dB(A) Height (m) MDV-V28WDHN1(AtB) MDV-V36WDHN1(AtB) MDV-V42WDHN1(AtB) MDV-V48WDHN1(AtB) MDV-V56WDHN1(AtB) Notes: Sound pressure level is measured at a position 1m in front of the unit and Hm above the floor in a semi-anechoic chamber. During in-situ operation, sound pressure levels may be higher as a result of ambient noise.
  • Page 67 Atom B Series VRF 50/60Hz Figure 2-9.4: 42 model octave band level Figure 2-9.5: 48 model octave band level Figure 2-9.6: 56 model octave band level...

  • Page 68: Accessories

    Atom B Series VRF 50/60Hz 10 Accessories Table 2-10.1: Standard accessories Name Shape Quantity Outdoor unit owner’s and installation manual Water outlet connection pipe Network matching wires Rubber wire ring (for 36/42/48/56 models)
  • Page 69 Atom B Series VRF 50/60Hz Part 3 System Design and Installation 1 Preface to Part 3 ................... 69 2 Unit Placement and Installation ............70 3 Refrigerant Piping Design ..............74 4 Refrigerant Piping Installation ............... 79 5 Drain Piping ..................90 6 Insulation ....................

  • Page 70: Preface To Part 3

    The information contained in this Engineering Data Book may primarily be of use during the system design stage of a Midea Atom Series VRF project. Additional important information which may primarily be of use during field installation has been placed in boxes, such as the example below, titled “Notes for installers”.

  • Page 71: Unit Placement And Installation

    Atom B Series VRF 50/60Hz 2 Unit Placement and Installation 2.1 Outdoor Units 2.1.1 Placement considerations Placement of outdoor units should take account of the following considerations:  Air conditioners should not be exposed to direct radiation from a high-temperature heat source. ...
  • Page 72 Atom B Series VRF 50/60Hz 2.1.3 Base structures Outdoor unit base structure design should take account of the following considerations:  A solid base prevents excess vibration and noise. Outdoor unit bases should be constructed on solid ground or on structures of sufficient strength to support the units’...
  • Page 73 Atom B Series VRF 50/60Hz 2.1.5 Acceptance and unpacking  Notes for installers  When units are delivered check whether any damage occurred during shipment. If there is damage to the surface or outside of a unit, submit a written report to the shipping company. ...
  • Page 74 Atom B Series VRF 50/60Hz 2.2 Indoor Units 2.2.1 Placement considerations Placement of indoor units should take account of the following considerations:  Sufficient space for drain piping and for access during servicing and maintenance should be allowed.  To ensure a good cooling/heating effect, short-circuit ventilation (where outlet air returns quickly to a unit’s air inlet) should be avoided.

  • Page 75: Refrigerant Piping Design

    Atom B Series VRF 50/60Hz 3 Refrigerant Piping Design 3.1 Design Considerations Refrigerant piping design should take account of the following considerations:  The amount of brazing required should be kept to a minimum.  On the two inside sides of the first indoor branch joint (“A” in Figures 3-3.4 and Figure 3-3.5) the system should, as far as possible, be equal in terms of number of units, total capacities and total piping lengths.
  • Page 76 Atom B Series VRF 50/60Hz 3.4 The Permitted Piping Lengths and Level Differences The piping length and level difference requirements that apply are summarized in Table 3-3.2 and are fully described as follows (refer to Figure 3-3.1 and Figure 3-3.2): Table 3-3.2: Summary of permitted refrigerant piping lengths and level differences Permitted value Piping...
  • Page 77 Atom B Series VRF 50/60Hz Table 3-3.3: Connectable indoor units Outdoor unit model Number of connected indoor units Connectable indoor unit capacity range MDV-V28WDHN1(AtB) MDV-V36WDHN1(AtB) MDV-V42WDHN1(AtB) 45-130% outdoor unit’s capacity MDV-V48WDHN1(AtB) MDV-V56WDHN1(AtB) 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 Main pipe size (mm) Total capacity of downstream inner units...
  • Page 78 Atom B Series VRF 50/60Hz Tables 3-3.8, specify the max difference, the length of refrigerant pipe and the number of bends When the outdoor unit connects one indoor unit. Table 3-3.8: Summary of permitted refrigerant piping lengths and level differences (only one indoor unit) The length of The number The max height drop...
  • Page 79 Atom B Series VRF 50/60Hz 3.7 Refrigerant Leakage Precautions R410A refrigerant is not flammable in air at temperatures up to 100°C at atmospheric pressure and is generally considered a safe substance to use in air conditioning systems. Nevertheless, precautions should be taken to avoid danger to life in the unlikely event of a major refrigerant leakage.

  • Page 80: Refrigerant Piping Installation

    Atom B Series VRF 50/60Hz 4 Refrigerant Piping Installation 4.1 Procedure and Principles 4.1.1 Installation procedure  Notes for installers Installation of the refrigerant piping system should proceed in the following order: Pipe Pipe brazing Pipe Gas tightness Joint Vacuum drying insulation and installation flushing...
  • Page 81 Atom B Series VRF 50/60Hz 4.2 Storing Copper Piping 4.2.1 Pipe delivery, storage and sealing  Notes for installers  Ensure that piping does not get bent or deformed during delivery or whilst stored.  On construction sites store piping in a designated location. ...
  • Page 82 Atom B Series VRF 50/60Hz 4.3.3 Expanding copper piping ends  Notes for installers  Ends of copper piping can be expanded so that another length of piping can be inserted and the joint brazed.  Insert the expanding head of the pipe expander into the pipe. After completing pipe expansion, rotate the copper pipe a few degrees to rectify the straight line mark left by the expanding head.
  • Page 83 Atom B Series VRF 50/60Hz 4.3.5 Bending piping Bending copper piping reduces the number of brazed joints required and can improve quality and save material.  Notes for installers Piping bending methods  Hand bending is suitable for thin copper piping (Ф6. 35mm - Ф12. 7mm). ...
  • Page 84 Atom B Series VRF 50/60Hz 4.5 Brazing Care must be taken to prevent oxide forming on the inside of copper piping during brazing. The presence of oxide in a refrigerant system adversely affects the operation of valves and compressors, potentially leading to low efficiency or even compressor failure.
  • Page 85 Atom B Series VRF 50/60Hz … box continued from previous page Piping orientation during brazing Brazing should be conducted downwards or horizontally to avoid filler leakage. Figure 3-4.6: Piping orientation during brazing Piping overlap during brazing Table 3-4.3 specifies the minimum permissible piping overlap and the range of permissible gap sizes for brazed joints on piping of different diameters.
  • Page 86 Atom B Series VRF 50/60Hz 4.6 Branch Joints  Notes for installers  Use U-shaped branch joints as specified on the Figure 3-4.8: Branch joint orientation construction drawings – do not replace U-shaped branch joints with tee joints.  Indoor branch joints may be installed either horizontally or vertically.
  • Page 87 Atom B Series VRF 50/60Hz 4.7.2 Procedure  Notes for installers Warning Only use nitrogen for flushing. Using carbon dioxide risks leaving condensation in the piping. Oxygen, air, refrigerant, flammable gases and toxic gases must not be used for flushing. Use of such gases may result in fire or explosion. Procedure The liquid and gas sides can be flushed simultaneously;...
  • Page 88 Atom B Series VRF 50/60Hz 4.8 Gastightness Test 4.8.1 Purpose To prevent faults caused by refrigerant leakage, a gastightness test should be performed before system commissioning. 4.8.2 Procedure  Notes for installers Warning Only dry nitrogen should be used for gastightness testing. Oxygen, air, flammable gases and toxic gases must not be used for gastightness testing.
  • Page 89 Atom B Series VRF 50/60Hz 4.8.3 Leak detection  Notes for installers The general methods for identifying the source of a leak are as follows: 1. Audio detection: relatively large leaks are audible. 2. Touch detection: place your hand at joints to feel for escaping gas. 3.
  • Page 90 Atom B Series VRF 50/60Hz 4.9.2 Procedure  Notes for installers During vacuum drying, a vacuum pump is used to lower the pressure in the piping to the extent that any moisture present evaporates. At 5mmHg (755mmHg below typical atmospheric pressure) the boiling point of water is 0°C. Therefore a vacuum pump capable of maintaining a pressure of -756mmHg or lower should be used.

  • Page 91: Drain Piping

    Atom B Series VRF 50/60Hz 5 Drain Piping 5.1 Design Considerations Drain piping design should take account of the following considerations:  Indoor unit condensate drain piping needs to be of sufficient diameter to carry the volume of condensate produced at the indoor units and installed at a slope sufficient to allow drainage.
  • Page 92 Atom B Series VRF 50/60Hz installed too close to indoor unit lift pumps. Figure 3-5.5: Drain piping air vents  Air conditioner drain piping should be installed separately from waste, rainwater and other drain piping and should not come into direct contact with the ground. ...
  • Page 93 Atom B Series VRF 50/60Hz Table 3-5.2: Vertical drain piping diameters Nominal PVC piping Capacity (L/h) Remarks diameter (mm) PVC25 Branch piping only PVC32 PVC40 PVC50 1440 PVC63 2760 Branch or main piping PVC75 5710 PVC90 8280 5.4 Drain Piping for Units with Lift Pumps Drain piping for units with lift pumps should take account of the following additional considerations: ...
  • Page 94 Atom B Series VRF 50/60Hz 5.6 Water tightness Test and Water Flow Test Once installation of a drainage piping system is complete, water tightness and water flow tests should be performed.  Notes for installers Water tightness test  Fill the piping with water and test for leakages over a 24-hour period. Water flow test (natural drainage test) ...

  • Page 95: Insulation

    Atom B Series VRF 50/60Hz 6 Insulation 6.1 Refrigerant Piping Insulation 6.1.1 Purpose During operation, the temperature of the refrigerant piping varies. Insulation is required to ensure unit performance and compressor lifespan. During cooling, the gas pipe temperature can be very low. Insulation prevents condensation forming on the piping.
  • Page 96 Atom B Series VRF 50/60Hz Figure 3-6.1: Installation of joint insulation (unit: mm) 6.2 Drain Piping Insulation  Use rubber/plastic insulating tube with a B1 fire resistance rating.  The insulation should typically be in excess of 10mm thick.  For drain piping installed inside a wall, insulation is not required. ...

  • Page 97: Charging Refrigerant

    Atom B Series VRF 50/60Hz 7 Charging Refrigerant 7.1 Calculating Additional Refrigerant Charge The additional refrigerant charge required depends on the lengths and diameters of the outdoor and indoor liquid pipes. Table 3-7.1 shows the additional refrigerant charge required per meter of equivalent pipe length for different diameters of pipe.
  • Page 98 Atom B Series VRF 50/60Hz … box continued from previous page Step 4 · Open the three valves on the pressure gauge to begin charging refrigerant. · When the amount charged reaches R (kg), close the three valves. If the amount charged has not reached R (kg) but no additional refrigerant can be charged, close the three valves on the pressure gauge, run the outdoor unit in cooling mode, and then open the yellow and blue valves.

  • Page 99: Electrical Wiring

    Atom B Series VRF 50/60Hz 8 Electrical Wiring 8.1 General  Notes for installers Caution  All installation and wiring must be carried out by competent and suitably qualified, certified and accredited professionals and in accordance with all applicable legislation. ...
  • Page 100 Atom B Series VRF 50/60Hz Figure 3-8.1: Indoor unit power supply wiring Single-phase 220~ 50/60Hz Leakage protector Manual switch Branch box Indoor unit  Notes for installers The power supply should be connected to the outdoor unit power supply terminals as shown in Figure 3-8.2. Figure 3-8.2: Outdoor unit 1-phase power supply terminals 8.3 Communication Wiring Communication wiring design and installation should adhere to the following requirements:...
  • Page 101 Atom B Series VRF 50/60Hz  Notes for installers The communication wires should be connected to the outdoor unit terminals indicated in Figure 3-8.3 and Table 3-8.2. Caution  Communication wiring has polarity. Care should be taken to connect the poles correctly. Figure 3-8.3: Outdoor unit communication terminals Table 3-8.2: Communication connections Terminals...
  • Page 102 Atom B Series VRF 50/60Hz 8.4 Wiring example Figure 3-8.4: System communication wiring example Note: The wired controller and centralized controller in the dashed box are optional accessories. If necessary, please contact the local distributor for purchase.

  • Page 103: Installation In Areas Of High Salinity

    Atom B Series VRF 50/60Hz 9 Installation in Areas of High Salinity 9.1 Caution Do not install outdoor units where they could be directly exposed to sea air. Corrosion, particularly on the condenser and evaporator fins, could cause product malfunction or inefficient performance. Outdoor units installed in seaside locations should be placed such as to avoid direct exposure to the sea air and additional anticorrosion treatment options should be selected, otherwise the service life of the outdoor units will be seriously affected.

  • Page 104: Commissioning

    Atom B Series VRF 50/60Hz 10 Commissioning 10.1 Multi-system Projects For projects with multiple refrigerant systems, each independent refrigeration system (i.e. each system of one outdoor unit and its connected indoor units) should be given a test run independently, before the multiple systems that make up a project are run simultaneously.
  • Page 105 Atom B Series VRF 50/60Hz the CHECK button on the outdoor unit’s main PCB and complete the cooling mode columns of one Sheet D and one Sheet E of the system commissioning report for the outdoor unit. Run the system in heating mode with the following settings: temperature 30°C; fan speed high. After one hour, complete Sheet B of the system commissioning report then check the system parameters using the CHECK button on the outdoor unit’s main PCB and complete the heating mode columns of one Sheet D and one Sheet E of the system commissioning report for the outdoor unit.

  • Page 106: Appendix To Part 3 - System Commissioning Report

    Atom B Series VRF 50/60Hz 11 Appendix to Part 3 – System Commissioning Report A total of up to 4 report sheets should be completed for each system:  One Sheet A, one Sheet B and one Sheet C per system. ...
  • Page 107 Atom B Series VRF 50/60Hz System Commissioning Report – Sheet A SYSTEM INFORMATION Project name and location Customer company System name Installation company Commissioning date Agent company Outdoor ambient temp. Commissioning engineer Model Serial no. Power supply (V) Outdoor unit information OUTDOOR UNIT Compressor suction pipe Current (A)
  • Page 108 Atom B Series VRF 50/60Hz System Commissioning Report – Sheet B SYSTEM INFORMATION Project name and location Customer company System name Installation company Commissioning date Agent company Outdoor ambient temp. Commissioning engineer Model Serial no. Power supply (V) Outdoor unit information OUTDOOR UNIT Compressor suction pipe Current (A)
  • Page 109 RECORD OF ISSUES SEEN DURING COMMISSIONING Serial no. of Description of observed issue Suspected cause Troubleshooting undertaken relevant unit OUTDOOR UNIT FINAL CHECKLIST SW2 system check performed? Any abnormal noise? Any abnormal vibration? Fan rotation normal? Commissioning engineer Dealer Midea representative Name: Signature: Date:...
  • Page 110 Atom B Series VRF 50/60Hz System Commissioning Report – Sheet D Project name and location System name Observed values DSP1 Cooling Heating Parameters displayed on DSP2 Remarks content mode mode 0.-- Operating frequency Actual value = value displayed 1.-- Operating mode Refer to Note 1 2.-- Operating fan speed level...
  • Page 111 Ver. 2021-01 HVAC & Building Technologies Division Midea Group Add.: Midea Headquarters Building, 6 Midea Avenue, Shunde, Foshan, Guangdong, China Postal code: 528311 hbt.midea.com / global.midea.com Note: Product specifications change from time to time as product improvements and developments are released and may vary from those in this...

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