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MDV MDV8Si Series Manual

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Engineering Data
MDV8Si
MDVO-V8S252V2R1B
MDVO-V8S280V2R1B
MDVO-V8S335V2R1B
MDVO-V8S400V2R1B
Commercial Air Conditioners
Series VRF
MDVO-V8S450V2R1B
MDVO-V8S500V2R1B
MDVO-V8S560V2R1B
MDVO-V8S615V2R1B
R410A

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  • Page 1 R410A Commercial Air Conditioners Engineering Data MDV8Si Series VRF MDVO-V8S252V2R1B MDVO-V8S450V2R1B MDVO-V8S280V2R1B MDVO-V8S500V2R1B MDVO-V8S335V2R1B MDVO-V8S560V2R1B MDVO-V8S400V2R1B MDVO-V8S615V2R1B...
  • Page 3 MDV8Si VRF 50Hz CONTENTS Part 1 General Information ................3 Part 2 Outdoor Unit Engineering Data ............18 Part 3 System Design and Installation ............ 121...
  • Page 4 MDV8Si VRF 50Hz...

  • Page 5: Table Of Contents

    MDV8Si VRF 50Hz 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...

  • Page 6: Indoor And Outdoor Unit Capacities

    MDV8Si VRF 50Hz 1 Indoor and Outdoor Unit Capacities 1.1 Indoor Units 1.1.1 Standard indoor units Table 1-1.1: Standard indoor unit abbreviation codes Abbreviation Abbreviation Type Type code code One-way Cassette High Static Pressure Duct Two-way Cassette Wall-mounted Compact Four-way Cassette Ceiling &...
  • Page 7 MDV8Si VRF 50Hz 1.3 Outdoor Units Table 1-1.5: Outdoor unit capacity range Capacity Model Name Combination Type MDVO-Vi252V2R1B MDVO-Vi280V2R1B 10HP MDVO-Vi335V2R1B 12HP MDVO-Vi400V2R1B 14HP MDVO-Vi450V2R1B 16HP MDVO-Vi500V2R1B 18HP MDVO-Vi560V2R1B 20HP MDVO-Vi615V2R1B 22HP Notes: MDV8Si outdoor units could not be combined.

  • Page 8: External Appearance

    MDV8Si VRF 50Hz 2 External Appearance 2.1 Indoor Units 2.1.1 Standard indoor units Table 1-2.1: Standard indoor unit appearance One-way Cassette Two-way Cassette Compact Four-way Cassette Four-way Cassette Arc Duct Medium Static Pressure Duct High Static Pressure Duct Floor Standing Wall-mounted Ceiling &...
  • Page 9 MDV8Si VRF 50Hz 2.3 Outdoor Units 2.3.1 Single units Table 1-2.4: Outdoor unit appearance 8/10/12/14HP 16/18/20/22HP...

  • Page 10: Nomenclature

    MDV8Si VRF 50Hz 3 Nomenclature 3.1 Indoor Units 3.1.1 Standard indoor units 3rd generation indoor units MDV I3A - 28 C4 V R1 2E ○ ○ ○ ○ ○ ○ ○ 1 Legend Code Remarks MDV brand generation VRF indoor unit...
  • Page 11 ○ ○ ○ ○ ○ 1 Legend Code Remarks MDV brand VRF indoor unit Capacity index (the capacity in kW multiplied by 10) Indoor unit type C1: One-way Cassette C2: Two-way Cassette C4C: Compact Four-way Cassette C4: Four-way Cassette D2: Medium Static Pressure Duct...
  • Page 12 OA: Fresh Air Processing Unit Series category (V: DC series) Refrigerant type (N1: R410A) Power supply D: 1 phase, 220-240V, 50/60Hz E: 1 phase, 220-240V, 50Hz 3rd generation MDV I3A - 280 OA V R1 2E ○ ○ ○ ○ ○ ○...
  • Page 13 ○ ○ ○ 1 Legend Code Remarks Heat recovery ventilator Series category (D: DC series) Airflow in m 3.2 Outdoor Units MDV O Vi - 252 V2 R1 B ○ ○ ○ ○ ○ ○ ○ 1 Legend Code Remarks...

  • Page 14: Combination Ratio

    Minimum Type Fresh air processing Fresh air processing units and combination ratio Standard indoor units only units only standard indoor units together MDV8Si Series 130% 100% 100% 1,2,3 outdoor units 200% Notes: All the indoor units connected should be indoor units with ø5mm size copper tube heater exchanger. This limitation is to avoid too big indoor unit exchanger cause reliability and performance problem.

  • Page 15: Selection Procedure

    MDV8Si VRF 50Hz 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: Indoor unit capacity corrected for indoor air temperature WB...
  • Page 16 MDV8Si VRF 50Hz 5.2 Example The following is a selection example based on total heat load for cooling. Figure 1-6.1: Room plan Room H Room G Room A Room F Room B Room E Room C Room D Step 1: Establish design conditions ...
  • Page 17 MDV8Si VRF 50Hz Table 1-6.2: Extract from medium static pressure duct (D2) cooling capacity table Indoor air temperature 14°C WB 16°C WB 18°C WB 19°C WB 20°C WB 22°C WB 24°C WB Capacity Model index 20°C DB 23°C DB 26°C DB 27°C DB 28°C DB 30°C DB...
  • Page 18 MDV8Si VRF 50Hz Table 1-6.5: Extract from Table 1-5.2 Combinations of Indoor and outdoor units Outdoor unit capacity Sum of capacity indexes of Maximum number of connected indoor units (standard connected indoor Capacity index indoor units only) units 25.2 126 to 327.6 140 to 364 33.5 167.5 to 435.5...
  • Page 19 MDV8Si VRF 50Hz Find the correction factor for piping length and level difference (“K1”) Figure 1-6.3: MDV8Si rate of change in cooling capacity K1=0.927 20 30 40 50 60 70 80 90 100 110 120 130 140 150 Notes: The horizontal axis shows equivalent length of piping between farthest indoor unit and first outdoor branch joint;...
  • Page 20 MDV8Si VRF 50Hz Part 2 Outdoor Unit Engineering Data 1 Specifications ....................19 2 Dimensions ....................22 3 Installation Space Requirements ..............23 4 Piping Diagrams ..................27 5 Wiring Diagrams ..................30 6 Electrical Characteristics ................32 7 Functional Components and Safety Devices ..........33 8 Capacity Tables ...................

  • Page 21: Specifications

    MDV8Si VRF 50Hz 1 Specifications 8-12HP Table 2-1.1: 8-12HP specifications Model MDVO-Vi252V2R1B MDVO-Vi280V2R1B MDVO-Vi335V2R1B 380-415V, 3N~, 50Hz Power supply 25.2 33.5 Capacity kBtu/h 86.0 95.5 114.3 Cooling(T1) Power input 11.6 3.30 3.09 2.90 25.2 33.5 Capacity kBtu/h 86.0 95.5 114.3 Heating (Rated) Power input...
  • Page 22 MDV8Si VRF 50Hz 14-18HP Table 2-1.1: 14-18HP specifications Model MDVO-Vi400V2R1B MDVO-Vi450V2R1B MDVO-Vi500V2R1B Power supply 380-415V, 3N~, 50Hz Capacity kBtu/h 136.5 153.5 170.6 Cooling(T1) Power input 15.7 16.0 19.5 2.54 2.82 2.57 Capacity kBtu/h 136.5 153.5 170.6 Heating (Rated) Power input 11.7 12.2 13.7...
  • Page 23 MDV8Si VRF 50Hz 20-22HP Table 2-1.2: 20-22HP specifications Model MDVO-Vi560V2R1B MDVO-Vi615V2R1B Power supply 380-415V, 3N~, 50Hz 61.5 Capacity kBtu/h 191.1 209.8 Cooling(T1) Power input 22.9 30.8 2.45 2.00 61.5 Capacity kBtu/h 191.1 209.8 Heating (Rated) Power input 15.5 18.8 3.62 3.28 Capacity Heating...

  • Page 24: Dimensions

    MDV8Si VRF 50Hz 2 Dimensions 2.1 Single Units 8/10/12/14HP Figure 2-2.1: 8/10/12/14 HP dimensions (unit: mm) 16/18/20/22HP Figure 2-2.2: 16/18/20/22HP dimensions (unit: mm) Detail R Figure 2-2.4: Detail R (unit: mm) S-shaped pipe connection(Liqui d side) Table 2-2.1: Connection piping diameter (unit: mm) Size ΦA(Liquid) ΦB(Gas)

  • Page 25: Installation Space Requirements

    MDV8Si VRF 50Hz 3 Installation Space Requirements There are obstacles on the air inlet side but no obstacles on the air outlet side and above the outdoor unit Figure 2-3.1:One outdoor unit installation (unit: mm) Figure 2-3.2:More than one outdoor unit installation (unit: mm) There are obstacles on the air inlet side and above the outdoor unit but no obstacles on the air outlet side Figure 2-3.3:One outdoor unit installation (unit: mm) Figure 2-3.4:More than one outdoor unit installation (unit: mm)
  • Page 26 MDV8Si VRF 50Hz There are obstacles on the air outlet side and above the outdoor unit but no obstacles on the air inlet side Figure 2-3.7:One outdoor unit installation (unit: mm) Figure 2-3.8:More than one outdoor unit installation (unit: mm) ≥300 There are obstacles on the air outlet side and the air inlet side but no obstacles above the outdoor unit.
  • Page 27 MDV8Si VRF 50Hz Table 2-3.1 Condition 0<L2<1/2H 1000 1500 ≤ 1/2H≤L2≤H 1250 1750 Install air duct to exhaust the air out of the space. L2>H Figure 2-3.13:One outdoor unit installation (unit: mm) Figure 2-3.14:More than one outdoor unit installation (unit: mm) Notes: 1.
  • Page 28 MDV8Si VRF 50Hz When outdoor units are installed in different rows on a rooftop Figure 2-3.17: One outdoor unit installation (unit: mm) Figure 2-3.18:More than one outdoor unit are installed in each row (unit: Notes: 1. H is the height of the outdoor unit. 2.

  • Page 29: Piping Diagrams

    MDV8Si VRF 50Hz 4 Piping Diagrams 8-14HP Figure 2-4.1: 8-14HP piping diagram Legend Parts name Parts name Inverter Compressor Charge port Oil separator Low pressure sensor High pressure switch Gas-liquid separator Check value Muffler Four-way valve Heat exchanger High pressure sensor Sensor Code Description Inverter Fan...
  • Page 30 MDV8Si VRF 50Hz 16-22HP Figure 2-4.2: 16-22HP piping diagram Legend Parts name Parts name Inverter Compressor Charge port Oil separator Low pressure sensor High pressure switch Gas-liquid separator Check value Muffler Four-way valve Heat exchanger High pressure sensor Sensor Code Description Inverter Fan Main exchanger pipe temperature sensor...

  • Page 31: Oil Separator

    MDV8Si VRF 50Hz Key components: 1. Oil separator: Separates oil from gas refrigerant pumped out of the compressor and quickly returns it to the compressor. Separation efficiency is up to 99%. 2. Gas-liquid separator: Separates liquid refrigerant from gas refrigerant, stores liquid refrigerant and oil to protect compressor from liquid hammering.

  • Page 32: Wiring Diagrams

    MDV8Si VRF 50Hz 5 Wiring Diagrams...
  • Page 33 MDV8Si VRF 50Hz Legend Code Name Code Name COMP Compressor Main exchanger pipe temperature sensor EEVA/EEVC Electronic expansion valve Outdoor ambient temperature sensor FAN A/ FAN B DC Fan Liquid pipe temperature sensor HEAT A Crankcase heater Microchannel heat exchanger inlet pipe temperature sensor Reactance Microchannel heat exchanger outlet pipe temperature sensor Four-way valve...

  • Page 34: Electrical Characteristics

    MDV8Si VRF 50Hz 6 Electrical Characteristics Table 2-6.1: Outdoor unit electrical characteristics Model Power Supply Compressor Min. Max. TOCA Capacity Volts Power(kW) volts volts （A） （A） （A） （A） 380~415 17.0 17.0 23.5 0.2×2 0.65×2 10HP 380~415 21.0 21.0 23.5 0.2×2 0.65×2 12HP 380~415...

  • Page 35: Functional Components And Safety Devices

    MDV8Si VRF 50Hz 7 Functional Components and Safety Devices Table 2-7.1: 8/10/12/14/16/18/20/22/24HP functional components and safety devices Item 10HP 12HP 14HP 16HP 18HP 20HP 22HP Compressor top and discharge pipe 115°C = 5kΩ ± 3% temperature sensors Compressor Crankcase heater Inverter Inverter module temperature sensor 90°C = 5kΩ...

  • Page 36: Capacity Tables

    MDV8Si VRF 50Hz 8 Capacity Tables 8.1 Cooling Capacity Tables Table2-8.1:8HP cooling capacity Indoor air temp. (°C DB/WD) Outdoor 22/15 23.3/16 25.8/18 27/19 28.2/20 30.7/22 32/24 air temp. (°CDB) 22.68 2.53 25.20 2.78 30.24 3.25 32.76 3.49 35.28 3.74 40.32 4.20 41.51 4.96...
  • Page 37 MDV8Si VRF 50Hz Table2-8.1:8HP cooling capacity (continued) Indoor air temp. (°C DB/WD) Outdoor 22/15 23.3/16 25.8/18 27/19 28.2/20 30.7/22 32/24 air temp. (°CDB) 19.19 2.24 21.32 2.46 25.59 2.87 27.72 3.09 29.85 3.30 34.12 3.69 38.38 4.16 19.19 2.24 21.32 2.47 25.59 2.88...
  • Page 38 MDV8Si VRF 50Hz Table2-8.1:8HP cooling capacity(continued) Indoor air temp. (°C DB/WD) Outdoor 22/15 23.3/16 25.8/18 27/19 28.2/20 30.7/22 32/24 air temp. (°CDB) 15.70 1.62 17.45 1.97 20.94 2.43 22.68 2.61 24.42 2.79 27.91 3.14 31.40 3.49 15.70 1.81 17.45 2.03 20.94 2.43 22.68...
  • Page 39 MDV8Si VRF 50Hz Table2-8.1:8HP cooling capacity(continued) Indoor air temp. (°C DB/WD) Outdoor 22/15 23.3/16 25.8/18 27/19 28.2/20 30.7/22 32/24 air temp. (°CDB) 12.21 1.25 13.57 1.42 16.28 1.84 17.64 2.06 19.00 2.20 21.71 2.47 24.42 2.78 12.21 1.37 13.57 1.59 16.28 1.90 17.64...
  • Page 40 MDV8Si VRF 50Hz Table2-8.1:8HP cooling capacity(continued) Indoor air temp. (°C DB/WD) Outdoor 22/15 23.3/16 25.8/18 27/19 28.2/20 30.7/22 32/24 air temp. (°CDB) 8.72 0.70 9.69 1.02 11.63 1.14 12.60 1.33 13.57 1.53 15.51 1.86 17.45 2.02 8.72 0.93 9.69 1.10 11.63 1.25 12.60...
  • Page 41 MDV8Si VRF 50Hz Table2-8.2:10HP cooling capacity Indoor air temp. (°C DB/WD) Outdoor 22/15 23.3/16 25.8/18 27/19 28.2/20 30.7/22 32/24 air temp. (°CDB) 25.40 2.93 28.22 3.19 33.87 3.76 36.69 4.04 39.51 4.32 45.16 5.00 46.67 5.80 25.40 2.95 28.22 3.20 33.87 3.77 36.69...
  • Page 42 MDV8Si VRF 50Hz Table2-8.2:10HP cooling capacity(continued) Indoor air temp. (°C DB/WD) Outdoor 22/15 23.3/16 25.8/18 27/19 28.2/20 30.7/22 32/24 air temp. (°CDB) 21.49 2.58 23.88 2.84 28.66 3.33 31.04 3.58 33.43 3.81 38.21 4.29 42.98 4.93 21.49 2.59 23.88 2.86 28.66 3.34 31.04...
  • Page 43 MDV8Si VRF 50Hz Table2-8.2:10HP cooling capacity(continued) Indoor air temp. (°C DB/WD) Outdoor 22/15 23.3/16 25.8/18 27/19 28.2/20 30.7/22 32/24 air temp. (°CDB) 17.45 2.18 19.38 2.40 23.26 2.80 25.20 3.01 27.14 3.22 31.02 3.63 34.89 4.04 17.45 2.18 19.38 2.40 23.26 2.81 25.20...
  • Page 44 MDV8Si VRF 50Hz Table2-8.2:10HP cooling capacity(continued) Indoor air temp. (°C DB/WD) Outdoor 22/15 23.3/16 25.8/18 27/19 28.2/20 30.7/22 32/24 air temp. (°CDB) 13.57 1.66 15.08 1.86 18.09 2.21 19.60 2.37 21.11 2.55 24.12 2.87 27.14 3.19 13.57 1.73 15.08 1.90 18.09 2.22 19.60...
  • Page 45 MDV8Si VRF 50Hz Table2-8.2:10HP cooling capacity(continued) Indoor air temp. (°C DB/WD) Outdoor 22/15 23.3/16 25.8/18 27/19 28.2/20 30.7/22 32/24 air temp. (°CDB) 9.69 1.12 10.77 1.27 12.92 1.57 14.00 1.78 15.08 1.87 17.23 2.09 19.38 2.33 9.69 1.22 10.77 1.39 12.92 1.67 14.00...
  • Page 46 MDV8Si VRF 50Hz Table2-8.3:12HP cooling capacity Indoor air temp. (°C DB/WD) Outdoor 22/15 23.3/16 25.8/18 27/19 28.2/20 30.7/22 32/24 air temp. (°CDB) 30.15 3.98 33.50 4.41 40.20 5.19 43.55 5.57 46.90 6.23 49.08 7.29 49.99 9.66 30.15 3.99 33.50 4.41 40.20 5.21 43.55...
  • Page 47 MDV8Si VRF 50Hz Table2-8.3:12HP cooling capacity(continued) Indoor air temp. (°C DB/WD) Outdoor 22/15 23.3/16 25.8/18 27/19 28.2/20 30.7/22 32/24 air temp. (°CDB) 25.51 3.53 28.35 3.85 34.02 4.55 36.85 4.90 39.68 5.25 45.35 6.07 46.99 7.19 25.51 3.55 28.35 3.88 34.02 4.57 36.85...
  • Page 48 MDV8Si VRF 50Hz Table2-8.3:12HP cooling capacity(continued) Indoor air temp. (°C DB/WD) Outdoor 22/15 23.3/16 25.8/18 27/19 28.2/20 30.7/22 32/24 air temp. (°CDB) 20.87 2.98 23.19 3.28 27.83 3.83 30.15 4.12 32.47 4.38 37.11 4.93 41.75 5.51 20.87 2.99 23.19 3.28 27.83 3.84 30.15...
  • Page 49 MDV8Si VRF 50Hz Table2-8.3:12HP cooling capacity(continued) Indoor air temp. (°C DB/WD) Outdoor 22/15 23.3/16 25.8/18 27/19 28.2/20 30.7/22 32/24 air temp. (°CDB) 16.23 2.24 18.04 2.58 21.65 3.02 23.45 3.25 25.25 3.47 28.86 3.93 32.47 4.40 16.23 2.35 18.04 2.59 21.65 3.05 23.45...
  • Page 50 MDV8Si VRF 50Hz Table2-8.3:12HP cooling capacity(continued) Indoor air temp. (°C DB/WD) Outdoor 22/15 23.3/16 25.8/18 27/19 28.2/20 30.7/22 32/24 air temp. (°CDB) 11.60 1.64 12.88 1.80 15.46 2.22 16.75 2.39 18.04 2.57 20.62 2.87 23.19 3.19 11.60 1.65 12.88 1.89 15.46 2.26 16.75...
  • Page 51 MDV8Si VRF 50Hz Table2-8.4:14HP cooling capacity Indoor air temp. (°C DB/WD) Outdoor 23.3 25.8 28.2 30.7 air temp. (°CDB) 36.00 3.45 40.00 3.90 48.00 5.49 52.00 7.20 56.00 7.51 58.13 7.55 59.47 7.57 36.00 3.55 40.00 4.02 48.00 6.53 52.00 7.60 56.00 7.81...
  • Page 52 MDV8Si VRF 50Hz Table2-8.4:14HP cooling capacity(continued) Indoor air temp. (°C DB/WD) Outdoor 23.3 25.8 28.2 30.7 air temp. (°CDB) 30.46 2.90 33.85 3.33 40.62 4.08 44.00 4.53 47.38 5.65 54.15 8.22 55.51 8.95 30.46 2.92 33.85 3.45 40.62 4.18 44.00 5.49 47.38 6.17...
  • Page 53 MDV8Si VRF 50Hz Table2-8.4:14HP cooling capacity(continued) Indoor air temp. (°C DB/WD) Outdoor 23.3 25.8 28.2 30.7 air temp. (°CDB) 24.92 3.12 27.69 3.43 33.23 4.06 36.00 4.34 38.77 4.66 44.31 5.47 49.85 6.37 24.92 3.13 27.69 3.45 33.23 4.06 36.00 4.35 38.77 4.85...
  • Page 54 MDV8Si VRF 50Hz Table2-8.4:14HP cooling capacity(continued) Indoor air temp. (°C DB/WD) Outdoor 23.3 25.8 28.2 30.7 air temp. (°CDB) 19.38 2.49 21.54 2.72 25.85 3.19 28.00 3.45 30.15 3.66 34.46 4.14 38.77 4.63 19.38 2.49 21.54 2.73 25.85 3.21 28.00 3.45 30.15 3.67...
  • Page 55 MDV8Si VRF 50Hz Table2-8.4:14HP cooling capacity(continued) Indoor air temp. (°C DB/WD) Outdoor 23.3 25.8 28.2 30.7 air temp. (°CDB) 13.85 1.68 15.38 1.89 18.46 2.34 20.00 2.52 21.54 2.68 24.62 3.01 27.69 3.34 13.85 1.83 15.38 2.01 18.46 2.34 20.00 2.52 21.54 2.70...
  • Page 56 MDV8Si VRF 50Hz Table2-8.5:16HP cooling capacity Indoor air temp. (°C DB/WD) Outdoor 23.3 25.8 28.2 30.7 air temp. (°CDB) 40.50 4.30 45.00 4.79 54.00 5.93 58.50 6.58 63.00 7.26 72.00 9.47 74.12 11.20 40.50 4.33 45.00 4.89 54.00 6.06 58.50 6.79 63.00 7.48...
  • Page 57 MDV8Si VRF 50Hz Table2-8.5:16HP cooling capacity(continued) Indoor air temp. (°C DB/WD) Outdoor 23.3 25.8 28.2 30.7 air temp. (°CDB) 34.27 3.80 38.08 4.17 45.69 5.01 49.50 5.62 53.31 6.09 60.92 7.13 68.54 9.15 34.27 3.80 38.08 4.19 45.69 5.09 49.50 5.68 53.31 6.21...
  • Page 58 MDV8Si VRF 50Hz Table2-8.5:16HP cooling capacity(continued) Indoor air temp. (°C DB/WD) Outdoor 23.3 25.8 28.2 30.7 air temp. (°CDB) 28.04 3.19 31.15 3.50 37.38 4.13 40.50 4.47 43.62 4.80 49.85 5.65 56.08 6.59 28.04 3.19 31.15 3.52 37.38 4.14 40.50 4.49 43.62 4.81...
  • Page 59 MDV8Si VRF 50Hz Table2-8.5:16HP cooling capacity(continued) Indoor air temp. (°C DB/WD) Outdoor 23.3 25.8 28.2 30.7 air temp. (°CDB) 21.81 2.51 24.23 2.75 29.08 3.24 31.50 3.48 33.92 3.72 38.77 4.20 43.62 4.74 21.81 2.51 24.23 2.75 29.08 3.25 31.50 3.49 33.92 3.74...
  • Page 60 MDV8Si VRF 50Hz Table2-8.5:16HP cooling capacity(continued) Indoor air temp. (°C DB/WD) Outdoor 23.3 25.8 28.2 30.7 air temp. (°CDB) 15.58 1.80 17.31 2.00 20.77 2.30 22.50 2.47 24.23 2.69 27.69 3.02 31.15 3.39 15.58 1.81 17.31 2.00 20.77 2.36 22.50 2.53 24.23 2.69...
  • Page 61 MDV8Si VRF 50Hz Table2-8.6:18HP cooling capacity Indoor air temp. (°C DB/WD) Outdoor 23.3 25.8 28.2 30.7 air temp. (°CDB) 45.72 4.71 50.80 5.39 60.96 6.63 66.04 7.32 71.12 8.49 81.28 12.63 84.01 13.85 45.72 4.77 50.80 5.52 60.96 6.73 66.04 8.44 71.12 10.35...
  • Page 62 MDV8Si VRF 50Hz Table2-8.6:18HP cooling capacity(continued) Indoor air temp. (°C DB/WD) Outdoor 23.3 25.8 28.2 30.7 air temp. (°CDB) 38.69 4.15 42.98 4.56 51.58 5.66 55.88 6.28 60.18 6.78 68.78 8.00 77.37 12.91 38.69 4.16 42.98 4.64 51.58 5.85 55.88 6.39 60.18 6.87...
  • Page 63 MDV8Si VRF 50Hz Table2-8.6:18HP cooling capacity(continued) Indoor air temp. (°C DB/WD) Outdoor 23.3 25.8 28.2 30.7 air temp. (°CDB) 31.65 3.47 35.17 3.83 42.20 4.51 45.72 4.85 49.24 5.35 56.27 6.43 63.30 7.32 31.65 3.48 35.17 3.83 42.20 4.52 45.72 4.95 49.24 5.45...
  • Page 64 MDV8Si VRF 50Hz Table2-8.6:18HP cooling capacity(continued) Indoor air temp. (°C DB/WD) Outdoor 23.3 25.8 28.2 30.7 air temp. (°CDB) 24.62 2.73 27.35 3.00 32.82 3.51 35.56 3.78 38.30 4.04 43.77 4.57 49.24 5.32 24.62 2.74 27.35 3.00 32.82 3.53 35.56 3.80 38.30 4.05...
  • Page 65 MDV8Si VRF 50Hz Table2-8.6:18HP cooling capacity(continued) Indoor air temp. (°C DB/WD) Outdoor 23.3 25.8 28.2 30.7 air temp. (°CDB) 17.58 1.97 19.54 2.17 23.45 2.51 25.40 2.73 27.35 2.91 31.26 3.29 35.17 3.68 17.58 1.99 19.54 2.19 23.45 2.56 25.40 2.77 27.35 2.95...
  • Page 66 MDV8Si VRF 50Hz Table2-8.7:20HP cooling capacity Indoor air temp. (°C DB/WD) Outdoor 23.3 25.8 28.2 30.7 air temp. (°CDB) 50.40 5.39 56.00 6.07 67.20 7.41 72.80 9.47 78.40 12.17 82.04 12.40 83.56 12.44 50.40 5.41 56.00 6.29 67.20 8.98 72.80 11.72 78.40 12.60...
  • Page 67 MDV8Si VRF 50Hz Table2-8.7:20HP cooling capacity(continued) Indoor air temp. (°C DB/WD) Outdoor 23.3 25.8 28.2 30.7 air temp. (°CDB) 42.65 4.61 47.38 5.07 56.86 6.34 61.60 6.97 66.34 7.54 75.82 12.60 78.56 14.19 42.65 4.63 47.38 5.18 56.86 6.57 61.60 7.13 66.34 9.32...
  • Page 68 MDV8Si VRF 50Hz Table2-8.7:20HP cooling capacity(continued) Indoor air temp. (°C DB/WD) Outdoor 23.3 25.8 28.2 30.7 air temp. (°CDB) 34.89 3.84 38.77 4.23 46.52 5.00 50.40 5.52 54.28 5.96 62.03 7.06 69.78 9.04 34.89 3.85 38.77 4.24 46.52 5.01 50.40 5.59 54.28 6.14...
  • Page 69 MDV8Si VRF 50Hz Table2-8.7:20HP cooling capacity(continued) Indoor air temp. (°C DB/WD) Outdoor 23.3 25.8 28.2 30.7 air temp. (°CDB) 27.14 3.00 30.15 3.31 36.18 3.90 39.20 4.21 42.22 4.50 48.25 5.14 54.28 5.95 27.14 3.04 30.15 3.32 36.18 3.92 39.20 4.23 42.22 4.52...
  • Page 70 MDV8Si VRF 50Hz Table2-8.7:20HP cooling capacity(continued) Indoor air temp. (°C DB/WD) Outdoor 23.3 25.8 28.2 30.7 air temp. (°CDB) 19.38 2.14 21.54 2.33 25.85 2.75 28.00 2.97 30.15 3.20 34.46 3.63 38.77 4.10 19.38 2.20 21.54 2.40 25.85 2.80 28.00 2.98 30.15 3.24...
  • Page 71 MDV8Si VRF 50Hz Table2-8.8:22HP cooling capacity Indoor air temp. (°C DB/WD) Outdoor 23.3 25.8 28.2 30.7 air temp. (°CDB) 55.35 6.80 61.50 7.56 73.80 10.80 79.95 15.11 86.10 17.55 88.75 17.80 90.63 18.20 55.35 6.89 61.50 7.75 73.80 12.79 79.95 15.53 86.10 18.25...
  • Page 72 MDV8Si VRF 50Hz Table2-8.8:22HP cooling capacity(continued) Indoor air temp. (°C DB/WD) Outdoor 23.3 25.8 28.2 30.7 air temp. (°CDB) 46.83 5.65 52.04 6.43 62.45 8.01 67.65 8.73 72.85 11.18 83.26 16.46 84.34 18.03 46.83 5.80 52.04 6.65 62.45 8.11 67.65 10.77 72.85 13.24...
  • Page 73 MDV8Si VRF 50Hz Table2-8.8:22HP cooling capacity(continued) Indoor air temp. (°C DB/WD) Outdoor 23.3 25.8 28.2 30.7 air temp. (°CDB) 38.32 4.73 42.58 5.23 51.09 6.36 55.35 6.96 59.61 7.66 68.12 8.96 76.64 14.29 38.32 4.75 42.58 5.23 51.09 6.38 55.35 7.09 59.61 7.90...
  • Page 74 MDV8Si VRF 50Hz Table2-8.8:22HP cooling capacity(continued) Indoor air temp. (°C DB/WD) Outdoor 23.3 25.8 28.2 30.7 air temp. (°CDB) 29.80 3.71 33.12 4.06 39.74 4.83 43.05 5.20 46.36 5.55 52.98 6.34 59.61 7.64 29.80 3.73 33.12 4.12 39.74 4.84 43.05 5.21 46.36 5.58...
  • Page 75 MDV8Si VRF 50Hz Table2-8.8:22HP cooling capacity(continued) Indoor air temp. (°C DB/WD) Outdoor 23.3 25.8 28.2 30.7 air temp. (°CDB) 21.29 2.60 23.65 2.89 28.38 3.41 30.75 3.70 33.12 3.96 37.85 4.50 42.58 5.04 21.29 2.69 23.65 2.92 28.38 3.45 30.75 3.70 33.12 3.98...

  • Page 76: Heating Capacity Tables

    MDV8Si VRF 50Hz 8.2 Heating Capacity Tables Table2-8.9:8HP heating capacity Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 17.30 7.72 17.22 8.00 17.15 8.29 17.12 8.44 17.09 8.60 17.04 8.93 -25.0...
  • Page 77 MDV8Si VRF 50Hz Table2-8.9:8HP heating capacity(continued) Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 17.04 7.86 16.97 8.15 16.91 8.46 16.89 8.62 16.86 8.78 16.82 9.14 -25.0 -25.4 17.93 8.21 17.86...
  • Page 78 MDV8Si VRF 50Hz Table2-8.9:8HP heating capacity(continued) Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 16.89 8.29 16.84 8.60 16.79 8.94 16.71 9.15 16.70 9.85 16.70 11.32 -25.0 -25.4 17.77 8.67 17.72...
  • Page 79 MDV8Si VRF 50Hz Table2-8.9:8HP heating capacity(continued) Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 17.07 9.83 16.74 10.63 16.16 9.86 15.58 9.39 15.01 9.04 13.85 8.54 -25.0 -25.4 17.97 9.93 17.62...
  • Page 80 MDV8Si VRF 50Hz Table2-8.9:8HP heating capacity(continued) Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 13.19 7.97 12.37 7.64 11.54 7.28 11.13 7.06 10.72 6.83 9.89 6.36 -25.0 -25.4 13.89 7.77 13.02...
  • Page 81 MDV8Si VRF 50Hz Table2-8.10:10HP heating capacity Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 19.23 8.20 19.17 8.51 19.12 8.84 19.10 9.02 19.08 9.20 19.05 9.57 -25.0 -25.4 20.25 8.59 20.18...
  • Page 82 MDV8Si VRF 50Hz Table2-8.10:10HP heating capacity(continued) Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 18.94 8.51 18.90 8.84 18.86 9.20 18.85 9.38 18.84 9.57 18.83 9.98 -25.0 -25.4 19.94 8.94 19.89...
  • Page 83 MDV8Si VRF 50Hz Table2-8.10:10HP heating capacity(continued) Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 18.70 9.03 18.68 9.40 18.64 9.94 18.61 10.56 18.59 11.36 18.55 12.36 -25.0 -25.4 19.68 9.51 19.66...
  • Page 84 MDV8Si VRF 50Hz Table2-8.10:10HP heating capacity(continued) Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 18.36 12.00 18.33 12.60 18.09 12.00 18.18 11.50 17.51 10.98 16.16 10.01 -25.0 -25.4 19.32 11.90 19.30...
  • Page 85 MDV8Si VRF 50Hz Table2-8.10:10HP heating capacity(continued) Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 15.39 9.33 14.43 8.86 13.47 8.41 12.99 8.15 12.50 7.89 11.54 7.34 -25.0 -25.4 16.20 9.09 15.19...
  • Page 86 MDV8Si VRF 50Hz Table2-8.11:12HP heating capacity Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 19.53 7.57 19.42 7.86 19.33 8.16 19.28 8.32 19.24 8.48 19.16 8.82 -25.0 -25.4 20.55 7.93 20.45...
  • Page 87 MDV8Si VRF 50Hz Table2-8.11:12HP heating capacity(continued) Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 19.29 7.79 19.19 8.09 19.11 8.41 19.07 8.58 19.03 8.75 18.96 9.10 -25.0 -25.4 20.30 8.19 20.20...
  • Page 88 MDV8Si VRF 50Hz Table2-8.11:12HP heating capacity(continued) Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 18.78 2.20 18.69 2.29 18.61 2.40 18.58 2.45 18.55 2.50 18.49 2.62 -25.0 -25.4 19.77 2.14 19.68...
  • Page 89 MDV8Si VRF 50Hz Table2-8.11:12HP heating capacity(continued) Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 17.98 9.88 17.89 11.02 17.81 12.00 17.78 12.37 17.75 12.33 18.46 11.55 -25.0 -25.4 18.92 10.16 18.83...
  • Page 90 MDV8Si VRF 50Hz Table2-8.11:12HP heating capacity(continued) Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 18.32 10.96 17.18 10.14 16.03 9.35 15.46 8.96 14.89 8.61 13.74 7.96 -25.0 -25.4 19.29 10.64 18.08...
  • Page 91 MDV8Si VRF 50Hz Table2-8.12:14HP heating capacity Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 20.61 8.58 20.49 8.91 20.39 9.24 20.33 9.42 20.28 9.60 20.19 9.98 -25.0 -25.4 21.69 8.91 21.57...
  • Page 92 MDV8Si VRF 50Hz Table2-8.12:14HP heating capacity(continued) Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 19.89 8.66 19.97 9.00 19.87 9.35 20.03 9.73 19.78 9.72 19.90 10.31 -25.0 -25.4 20.94 9.08 21.02...
  • Page 93 MDV8Si VRF 50Hz Table2-8.12:14HP heating capacity(continued) Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 19.50 9.17 19.40 9.52 19.31 9.89 19.26 10.08 19.09 10.28 19.02 10.70 -25.0 -25.4 20.52 9.59 20.42...
  • Page 94 MDV8Si VRF 50Hz Table2-8.12:14HP heating capacity(continued) Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 18.66 9.91 18.56 10.54 18.48 11.76 18.44 12.47 18.27 13.14 18.20 14.22 -25.0 -25.4 19.64 10.37 19.54...
  • Page 95 MDV8Si VRF 50Hz Table2-8.12:14HP heating capacity(continued) Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 17.86 14.09 17.77 13.87 17.68 13.02 17.64 12.45 17.48 11.90 16.49 10.81 -25.0 -25.4 18.80 13.78 18.70...
  • Page 96 MDV8Si VRF 50Hz Table2-8.13:16HP heating capacity Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 24.41 9.04 24.27 9.40 24.15 9.77 24.09 9.97 24.03 10.17 23.92 10.59 -25.0 -25.4 25.69 9.45 25.55...
  • Page 97 MDV8Si VRF 50Hz Table2-8.13:16HP heating capacity(continued) Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 23.94 9.29 23.81 9.67 23.69 10.06 23.64 10.26 23.58 10.47 23.48 10.91 -25.0 -25.4 25.20 9.75 25.06...
  • Page 98 MDV8Si VRF 50Hz Table2-8.13:16HP heating capacity(continued) Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 23.29 9.67 23.17 10.06 23.06 10.49 23.01 10.71 22.97 10.93 22.88 11.42 -25.0 -25.4 24.51 10.20 24.39...
  • Page 99 MDV8Si VRF 50Hz Table2-8.13:16HP heating capacity(continued) Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 22.29 10.49 22.17 10.94 22.07 12.06 22.02 12.96 21.98 13.91 21.90 15.29 -25.0 -25.4 23.46 11.10 23.34...
  • Page 100 MDV8Si VRF 50Hz Table2-8.13:16HP heating capacity(continued) Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 21.33 15.35 21.22 14.20 21.12 12.98 20.61 12.37 19.85 11.78 18.32 10.67 -25.0 -25.4 22.45 14.83 22.34...
  • Page 101 MDV8Si VRF 50Hz Table2-8.14:18HP heating capacity Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 25.09 9.59 24.96 9.97 24.84 10.36 24.79 10.57 24.74 10.78 24.64 11.21 -25.0 -25.4 26.41 10.01 26.28...
  • Page 102 MDV8Si VRF 50Hz Table2-8.14:18HP heating capacity(continued) Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 24.60 9.93 24.49 10.31 24.38 10.72 24.32 10.93 24.28 11.15 24.19 11.61 -25.0 -25.4 25.90 10.37 25.77...
  • Page 103 MDV8Si VRF 50Hz Table2-8.14:18HP heating capacity(continued) Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 24.00 10.02 23.89 10.42 23.79 10.86 23.74 11.08 23.70 11.32 23.62 11.81 -25.0 -25.4 25.27 10.59 25.15...
  • Page 104 MDV8Si VRF 50Hz Table2-8.14:18HP heating capacity(continued) Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 22.97 11.05 22.87 11.50 22.77 12.00 22.72 12.33 22.68 13.13 22.61 15.06 -25.0 -25.4 24.18 11.62 24.07...
  • Page 105 MDV8Si VRF 50Hz Table2-8.14:18HP heating capacity(continued) Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 21.98 15.36 21.88 16.30 21.79 15.51 21.75 14.88 21.71 14.21 20.70 12.84 -25.0 -25.4 23.14 15.21 23.03...
  • Page 106 MDV8Si VRF 50Hz Table2-8.15:20HP heating capacity Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 29.98 11.14 29.81 11.60 29.64 12.08 29.55 12.33 29.47 12.59 29.33 13.13 -25.0 -25.4 31.56 11.72 31.38...
  • Page 107 MDV8Si VRF 50Hz Table2-8.15:20HP heating capacity(continued) Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 29.34 11.38 29.18 11.85 29.02 12.35 28.95 12.61 28.87 12.88 28.74 13.45 -25.0 -25.4 30.89 12.03 30.71...
  • Page 108 MDV8Si VRF 50Hz Table2-8.15:20HP heating capacity(continued) Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 28.48 12.40 28.33 12.92 28.18 13.47 28.11 13.75 28.04 14.05 27.92 14.67 -25.0 -25.4 29.98 12.94 29.82...
  • Page 109 MDV8Si VRF 50Hz Table2-8.15:20HP heating capacity(continued) Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 27.26 13.44 27.11 14.02 26.97 14.63 26.90 14.96 26.84 15.30 26.72 19.72 -25.0 -25.4 28.69 14.04 28.53...
  • Page 110 MDV8Si VRF 50Hz Table2-8.15:20HP heating capacity(continued) Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 26.09 13.55 25.94 13.71 26.93 15.79 25.97 15.10 25.01 14.00 23.09 13.10 -25.0 -25.4 27.46 14.67 27.31...
  • Page 111 MDV8Si VRF 50Hz Table2-8.16:22HP heating capacity Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 31.21 11.84 31.03 12.32 30.85 12.83 30.77 13.09 30.68 13.36 30.52 13.92 -25.0 -25.4 32.86 12.37 32.66...
  • Page 112 MDV8Si VRF 50Hz Table2-8.16:22HP heating capacity(continued) Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 30.60 12.21 30.42 12.71 30.25 13.23 30.17 13.50 30.10 13.78 29.95 14.36 -25.0 -25.4 32.21 12.78 32.02...
  • Page 113 MDV8Si VRF 50Hz Table2-8.16:22HP heating capacity(continued) Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 29.72 12.79 29.55 13.32 29.39 13.89 29.31 14.18 29.24 14.48 29.11 15.12 -25.0 -25.4 31.28 13.34 31.10...
  • Page 114 MDV8Si VRF 50Hz Table2-8.16:22HP heating capacity(continued) Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 28.44 13.77 28.28 14.35 28.12 14.98 28.05 15.30 27.98 15.65 27.86 16.36 -25.0 -25.4 29.94 14.37 29.76...
  • Page 115 MDV8Si VRF 50Hz Table2-8.16:22HP heating capacity(continued) Indoor air temp. °C DB Outdoor 16.0 18.0 20.0 21.0 22.0 24.0 air temp. °C DB °C WB -29.8 -30.0 27.22 16.32 27.06 19.66 29.50 18.95 28.44 17.92 27.39 17.08 25.28 15.34 -25.0 -25.4 28.65 16.82 28.48...
  • Page 116 MDV8Si VRF 50Hz 8.3 Capacity Correction Factors for Piping Length and Level Difference Figure 2-8.1: Rate of change in cooling capacity 20 30 40 50 60 70 80 90 100 110 120 130 140 150 Figure 2-8.2: Rate of change in heating capacity 20 30 40 50 60 70...
  • Page 117 MDV8Si VRF 50Hz 8.4 Capacity Correction Factors for Frost Accumulation The heating capacity tables do not take account of the reduction in capacity when frost has accumulated or while the defrosting operation is in progress. If snow has accumulated against the outside surface of the outdoor unit heat exchanger heating capacity is reduced.

  • Page 118: Operating Limits

    MDV8Si VRF 50Hz 9 Operating Limits Figure 2-9.1: Cooling operating limits Figure 2-9.2: Heating operating limits 10 15 20 25 30 35 10 15 20 25 30 35 Indoor temperature ( C DB) Indoor temperature ( C DB) Notes: These figures assume the following operating conditions: ...

  • Page 119: Sound Levels

    MDV8Si VRF 50Hz 10 Sound Levels 10.1 Overall Table 2-10.1: Sound pressure level Model dB(A) 10HP 12HP 14HP 16HP 18HP 20HP 22HP Notes: Sound pressure level is measured at a position 1m in front of the unit and 1.3m 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 120 MDV8Si VRF 50Hz 10.2 Octave Band Levels Figure 2-10.2: 8HP octave band level Figure 2-10.3: 10HP octave band level NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 NC-20 NC-20 500 1000 2000 4000 8000 1000 2000 4000 8000 Octave band center frequency (Hz) Octave band center frequency (Hz) Figure 2-10.4: 12HP octave band level...
  • Page 121 MDV8Si VRF 50Hz Figure 2-10.8: 20HP octave band level Figure 2-10.9: 22HP octave band level NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 NC-20 NC-20 500 1000 2000 4000 8000 500 1000 2000 4000 8000 Octave band center frequency (Hz) Octave band center frequency (Hz)

  • Page 122: Standard Accessories

    MDV8Si VRF 50Hz 11 Accessories 11.1 Standard Accessories Table 2-11.1: Standard accessories Name Shape Quantity Function Installation and owner's manual L-shaped connection pipe Connecting gas pipes Wrench Removing the side plate screws Build-out resistor Enhances communication stability S-shaped connection pipe Connecting gas and liquid pipes Plastic ring To protect power line...
  • Page 123 MDV8Si VRF 50Hz Part 3 System Design and Installation 1 Preface to Part 3..................122 2 Unit Placement and Installation ............... 123 3 Outdoor Unit Ducting and Shielding ............127 4 Refrigerant Piping Design................131 5 Refrigerant Piping Installation ..............140 6 Drain Piping ....................

  • Page 124: Preface To Part 3

    MDV8Si VRF 50Hz 1 Preface to Part 3 1.1 Notes for Installers Boxes The information contained in this Engineering Data Book may primarily be of use during the system design stage of a MDV8Si 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 125: Unit Placement And Installation

    MDV8Si VRF 50Hz 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 126 MDV8Si VRF 50Hz 2.1.3 Base structures Outdoor unit base structure design should take account of the following considerations:  The base of the outdoor unit must use the solid concrete surface as the cement base or the steel beam frame base. ...
  • Page 127 MDV8Si VRF 50Hz 2.1.5 Hoisting  Notes for installers  Do not remove any packaging before hoisting. If units are not packaged or if the packaging is damaged, use suitable boards or packing material to protect the units.  Hoist one unit at a time, using two ropes to ensure stability. ...

  • Page 128: Indoor Units

    MDV8Si VRF 50Hz 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 129: Outdoor Unit Ducting And Shielding

    MDV8Si VRF 50Hz 3 Outdoor Unit Ducting and Shielding 3.1 Ducting Requirements Figures 2-3.1 to Figures 2-3.20 show spacing requirements in different scenarios. If the installation space requirement cannot be met due to special installation conditions, the air duct should be installed. 3.2 Design Considerations Outdoor unit ducting design should take account of the following: ...

  • Page 130: Fan Performance

    MDV8Si VRF 50Hz 3.3 Fan Performance Figure 3-3.2: 8HP units fan performance Figure 3-3.3: 10HP units fan performance 80Pa 60Pa 40Pa 20Pa 11800(rated) 10000 11000 12000 13000 14000 Air flow (m³ /h) Figure 3-3.4: 12HP units fan performance Figure 3-3.5: 14HP units fan performance 80Pa 80Pa 60Pa...
  • Page 131 MDV8Si VRF 50Hz Figure 3-3.8: 20HP units fan performance Figure 3-3.9: 22HP units fan performance 80Pa 60Pa 40Pa 20Pa 18500(rated) 1500016000 17000 18000 19000 200002100022000 Air flow (m³ /h)  Notes for installers  These fan characteristics Curve above including both base models and high static pressure models.

  • Page 132: Installation Direction

    MDV8Si VRF 50Hz 3.5 Installation direction It is forbidden to install the outdoor unit horizontally along the base to avoid snow and ice accumulation that may hinder the drainage of the chassis. Figure 3-3.9: Installation direction with snow shield Snow drift and icing affect heat transfer...

  • Page 133: Refrigerant Piping Design

    MDV8Si VRF 50Hz 4 Refrigerant Piping Design 4.1 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 3-4.1 and 3-4.4) the system should, as far as possible, be equal in terms of number of units, total capacities and total piping lengths.
  • Page 134 MDV8Si VRF 50Hz 4.3 Permitted Piping Lengths and Level Differences The piping length and level difference requirements that apply are summarized in Table 3-4.2 and are fully described as follows (refer to Figure 3-4.1): Figure 3-4.1: Permitted refrigerant piping lengths and level differences Legend Main pipe Figures in parentheses...
  • Page 135 MDV8Si VRF 50Hz 1. Requirement 1: The piping between the farthest indoor unit (N14) and outdoor unit should not exceed 150m (actual length) and 175m (equivalent length). (The equivalent length of each branch joint is 0.5m, and the equivalent length of each branch header is 1m.) 2.
  • Page 136 MDV8Si VRF 50Hz 4.4 Selecting Piping Diameters Tables 3-4.6 to 3-4.8, below, specify the required pipe diameters for the indoor and outdoor piping. Figure 3-4.3: Selecting piping diameters Legend Main pipe to L Indoor main pipes Figures in parentheses indicate indoor unit capacity indexes.
  • Page 137 MDV8Si VRF 50Hz 4.4.2 Diameters of Indoor main pipes and indoor branch joint kits Based on the total capacity of the indoor unit, select the branch joint for the indoor unit from the following table Table 3-4.7: Indoor main pipes (L2 to L11) and indoor branch joint kits Total capacity indexes of indoor units Gas pipe (mm) Liquid pipe (mm)
  • Page 138 MDV8Si VRF 50Hz 4.5 Refrigerant Piping Selection Example The example below illustrates the piping selection procedure for a system consisting of one outdoor unit (22HP) and 12 indoor units. The system's equivalent length between the farthest indoor unit and the outdoor unit is in excess of 90m; the piping between the farthest indoor unit and the first indoor branch joint is less than 40m in length;...
  • Page 139 MDV8Si VRF 50Hz to Table 3-4.7. Indoor main pipe L7 is Φ15.9 / Φ9.52. Indoor branch joint G is FQZHN-01D.  The indoor units (N12 to N13) downstream of indoor branch joint H have total capacity of 2.8*2=5.6kW. Refer to Table 3-4.7.
  • Page 140 MDV8Si VRF 50Hz Table 3-4.9: Indoor branch joint dimensions (unit: mm) (continued) Model Gas side joints Liquid side joints FQZHN-02D FQZHN-03D FQZHN-04D FQZHN-05D FQZHN-06D FQZHN-07D...
  • Page 141 MDV8Si VRF 50Hz 4.7 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 142: Refrigerant Piping Installation

    MDV8Si VRF 50Hz 5 Refrigerant Piping Installation 5.1 Procedure and Principles 5.1.1 Installation procedure  Notes for installers Installation of the refrigerant piping system should proceed in the following order: Pipe Pipe brazing Pipe Gastightness Joint Vacuum drying test insulation and installation flushing insulation...
  • Page 143 MDV8Si VRF 50Hz 5.2 Storing Copper Piping 5.2.1 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 144 MDV8Si VRF 50Hz 5.3.3 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 145 MDV8Si VRF 50Hz 5.3.5 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 146 MDV8Si VRF 50Hz 5.5 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 147 MDV8Si VRF 50Hz … box continued from previous page Piping orientation during brazing Brazing should be conducted downwards or horizontally to avoid filler leakage. Figure 3-5.6: Piping orientation during brazing Piping overlap during brazing Table 3-5.3 specifies the minimum permissible piping overlap and the range of permissible gap sizes for brazed joints on piping of different diameters.
  • Page 148 MDV8Si VRF 50Hz 5.6 Branch Joints 5.6.1 U-type branch joint  Notes for installers  Use U-shaped branch joints as specified on the Figure 3-5.8: Branch joint orientation construction drawings – do not replace U-shaped branch joints with tee joints. ...
  • Page 149 MDV8Si VRF 50Hz 5.6.2 Branch header  Notes for installers  The content in this section is only for attention during the installation of branch header.  Please refer to the installation manual of branch header for detailed selection and installation requirements.
  • Page 150 MDV8Si VRF 50Hz 5.7 Direction of refrigerant pipe connection Field piping can be connected in 4 directions. Before connecting, knock off the plate in the corresponding direction. Figure 3-5.13: Direction of refrigerant pipe connection right-front panel right-rear panel screws backward rightward screws forward...
  • Page 151 MDV8Si VRF 50Hz 5.8.2 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 152: Gastightness Test

    MDV8Si VRF 50Hz 5.9 Gastightness Test 5.9.1 Purpose To prevent faults caused by refrigerant leakage, a gastightness test should be performed before system commissioning. 5.9.2 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 153: Vacuum Drying

    MDV8Si VRF 50Hz 5.9.3 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 154 MDV8Si VRF 50Hz 5.10.2 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 155: Drain Piping

    MDV8Si VRF 50Hz 6 Drain Piping 6.1 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. Discharge as close as possible to the indoor units is usually preferable.
  • Page 156 MDV8Si VRF 50Hz Figure 3-6.5: Drain piping air vents Vent  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.  Drain piping diameter should be not less than the indoor units’ drain piping connection. ...
  • Page 157 MDV8Si VRF 50Hz Table 3-6.2: 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 6.4 Drain Piping for Units with Lift Pumps Drain piping for units with lift pumps should take account of the following additional considerations: ...

  • Page 158: Insulation

    MDV8Si VRF 50Hz 6.6 Watertightness Test and Water Flow Test Once installation of a drainage piping system is complete, watertightness and water flow tests should be performed.  Notes for installers Watertightness test  Fill the piping with water and test for leakages over a 24-hour period. Water flow test (natural drainage test) ...
  • Page 159 MDV8Si VRF 50Hz 7.1.4 Installation of piping insulation With the exception of joint insulation, insulation should be applied to piping before fixing the piping in place. Insulation at joints in refrigerant piping should be applied after the gastightness test has been completed. ...

  • Page 160: Charging Refrigerant

    MDV8Si VRF 50Hz 8 Charging Refrigerant 8.1 Calculating Additional Refrigerant Charge The additional refrigerant charge required depends on the lengths and diameters of the outdoor and indoor liquid pipes. Table 3-8.1 shows the additional refrigerant charge required per meter of equivalent pipe length for different diameters of pipe.

  • Page 161: Adding Refrigerant

    MDV8Si VRF 50Hz 8.2 Adding Refrigerant  Notes for installers Caution  Only charge refrigerant after performing a gastightness test and vacuum drying.  Never charge more refrigerant than required as doing so can lead to liquid hammering.  Only use refrigerant R410A - charging with an unsuitable substance may cause explosions or accidents. ...

  • Page 162: Electrical Wiring

    MDV8Si VRF 50Hz 9 Electrical Wiring 9.1 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.  Electrical systems should be grounded in accordance with all applicable legislation. ...

  • Page 163: Power Supply Wiring

    MDV8Si VRF 50Hz 9.2 Power Supply Wiring Power supply wiring design and installation should adhere to the following requirements:  Separate power supplies should be provided for the indoor units and outdoor units.  Where five or more outdoor units are installed, additional residual current protection (leakage protection) should be installed.

  • Page 164: Communication Wiring

    MDV8Si VRF 50Hz  Notes for installers The 380-415V, 3N~, 50Hz power supply should be connected to the outdoor unit power supply terminals as shown in Figure 3-9.4. Figure 3-9.4: Outdoor unit 3-phase power supply terminals 9.3 Communication Wiring Communication wiring design and installation should adhere to the following requirements: ...
  • Page 165 MDV8Si VRF 50Hz 9.3.1 Outdoor unit and indoor units’ P Q E communication Communication wiring design and installation should adhere to the following requirements:  0.75mm three-core shielded cable should be used for communication wiring. Using other types of cable can lead to interference and malfunction.
  • Page 166 MDV8Si VRF 50Hz 9.3.2 Outdoor unit and indoor units’ P Q communication Communication wiring design and installation should adhere to the following requirements:  0.75mm2 two-core shielded cable should be used for communication wiring. Using other types of cable can lead to interference and malfunction.
  • Page 167 MDV8Si VRF 50Hz  Notes for installers The communication wires should be connected to the outdoor unit terminals indicated in Figure 3-9.11 and Table 3- 9.2. Caution  Communication wiring has polarity. Care should be taken to connect the poles correctly. Figure 3-9.11: Outdoor unit communication terminals Table 3-9.2: Communication connections Terminals...

  • Page 168: Installation In Areas Of High Salinity

    MDV8Si VRF 50Hz 10 Installation in Areas of High Salinity 10.1 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 169: Commissioning

    MDV8Si VRF 50Hz 11 Commissioning 11.1 Pre-commissioning Checks Before turning on the power to the indoor and outdoor units, ensure the following:  Installation Check if the unit is installed correctly to prevent strange noises and vibrations when the unit starts. ...
  • Page 170 MDV8Si VRF 50Hz 11.2 Outdoor Unit Address and Communication Type Setting Step 1: Power on Cover the lower panel of the ODU, and power on all IDUs and ODUs. Step 2: Enter commissioning mode When the ODU is first powered on, it displays "-. -. -. -.", which means the unit is not commissioned. Long press the “DOWN” and “UP”...
  • Page 171 MDV8Si VRF 50Hz Figure 3-11.1: Test Run Procedure The system is powered Outdoor unit on and display “-.-.-.-.” Long press the “DOWN” and “UP” buttons simultaneously for 5s on the outdoor unit to enter the commissioning Set the number of The 3rd and 4th digits represent the IDUs, displays "01 01"...

  • Page 172: Operating The System

    MDV8Si VRF 50Hz 11.3 Multi-system Projects For projects with multiple refrigerant systems, each independent refrigeration system should be given a test run independently, before the multiple systems that make up a project are run simultaneously. 11.4 Operating the system 11.4.1 Commissioning test run of single refrigerant system After completing the above steps, a test run should be performed as described below and a System Commissioning Report (see Part 3, 12 “Appendix to Part 3 –...

  • Page 173: Appendix To Part 3 - System Commissioning Report

    MDV8Si VRF 50Hz 12 Appendix to Part 3 – System Commissioning Report A total of up to 11 report sheets should be completed for each system:  One Sheet A, one Sheet B and one Sheet C per system.  One Sheet D and one Sheet E per outdoor unit.
  • Page 174 MDV8Si VRF 50Hz MDV8Si Series 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...
  • Page 175 MDV8Si VRF 50Hz MDV8Si Series 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...
  • Page 176 MDV8Si VRF 50Hz MDV8Si Series System Commissioning Report – Sheet C Project name and location System name RECORD OF ISSUES SEEN DURING COMMISSIONING Serial no. of Description of observed issue Suspected cause Troubleshooting undertaken relevant unit OUTDOOR UNIT FINAL CHECKLIST...
  • Page 177 MDV8Si VRF 50Hz MDV8Si Series System Commissioning Report – Sheet D Project name and location System name Observed values DSP1 Cooling Heating Parameters displayed on DSP2 Remarks content mode mode --.-- "Standby (ODU address+ IDU number)/frequency/special status" 0 (The default) 0.--...
  • Page 178 MDV8Si VRF 50Hz MDV8Si Series System Commissioning Report – Sheet E Project name and location System name … table continued from previous page Observed values DSP1 Cooling Heating Parameters displayed on DSP2 Remarks content mode mode 34.-- EEVE position Actual value = value displayed × 4 35.--...
  • Page 179 T-V8EasyFitMEU 8-22HP Ver. 2023-2 Midea Building Technologies Division Midea Group Add.: Midea Headquarters Building, 6 Midea Avenue, Shunde, Foshan, Guangdong, China Postal code: 528311 mbt.midea.com / global.midea.com Midea reserves the right to change the specifications of the product, and to withdraw or replace products without prior notif ication or public announcement.

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