Midea Mini VRF Technical & Service Manual
  1. Manuals
  2. Brands
  3. Midea Manuals
  4. Air Conditioner
  5. Mini VRF
  6. Technical & service manual

Midea Mini VRF Technical & Service Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

Technical Service Manual
Mini VRF
Model:
3 phase, 380-415V, 50/60Hz
MDV-120W/DGN1
MDV-140W/DGN1
MDV-160W/DGN1

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the Mini VRF and is the answer not in the manual?

Questions and answers

Related Manuals for Midea Mini VRF

Summary of Contents for Midea Mini VRF

  • Page 1 Technical Service Manual Mini VRF Model: 3 phase, 380-415V, 50/60Hz MDV-120W/DGN1 MDV-140W/DGN1 MDV-160W/DGN1...
  • Page 2 Contents Part 1 General Information ........…1 Part 2 Outdoor Units ..........…9 Part 3 Installation ............ …44 Part 4 Troubleshooting ......... …58 Manufacture reserves the right to discontinue, or change at any time, specifications or designs without notices and without incurring obligations.
  • Page 3 R410A All DC Inverter Mini VRF MCAC-VTSM-2016-02...
  • Page 4 MCAC-VTSM-2016-02 R410A All DC Inverter Mini VRF Part 1 General Information 1. Product Lineup ..................2 2. Nomenclature ..................3 3. Features....................4 4. Indoor Units Lineup ................7 General Information...
  • Page 5 R410A All DC Inverter Mini VRF MCAC-VTSM-2016-02 1. Product Lineup Outdoor Units Model name Dimension body(mm) Net/Gross weight (kg) Power supply Width:900 MDV-120W/DGN1 Height:1327 95/105 380-415V 3N~50/60Hz Depth:400 Width:900 MDV-140W/DGN1 Height:1327 99/109 380-415V 3N~50/60Hz Depth:400 Width:900 MDV-160W/DGN1 Height:1327 100/110 380-415V 3N~50/60Hz...
  • Page 6 MCAC-VTSM-2016-02 R410A All DC Inverter Mini VRF 2. Nomenclature M D V - 120 W / D G N1 Refrigerant type N1:R410A Power Supply G: 380-415V 3N~50/60Hz Inverter Type D: DC Inverter W: Outdoor unit Cooling Capacity (×100W)* Midea *Note: the actual cooling capacity please refer to the nameplate.
  • Page 7 3.1 High efficient DC inverter compressor At the heart of Mini VRF system is a high efficiency twin rotary compressor. It enables the outdoor output to be modulated by the cooling or heating demands of the control area, ensures precise temperature regulation and highly efficiency energy usage.
  • Page 8 Level difference between IDU~IDU 3.6 Space saving design The Mini VRF units are slimmer and more compact, resulting in significant savings in installation space. In some large residential and light commercial areas, such as villas, restaurants, usually it need more than one indoor unit, which in turn requires multiple outdoor units.
  • Page 9 R410A All DC Inverter Mini VRF MCAC-VTSM-2016-02 3.7 Auto Addressing Outdoor unit can distribute addresses for indoor units automatically. Wireless and wired controllers can query and modify each indoor unit's address. 3.8 More Convenient Piping Connector – Branch Box Easier and safer installation thanks to a branch box that simplifies piping work and the adoption of screw connection.
  • Page 10 MCAC-VTSM-2016-02 R410A All DC Inverter Mini VRF 4. Indoor Units Lineup Cassette type Compact four-way One-way cassette Two-way cassette Four-way cassette cassette Capacity (×100W) ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●...
  • Page 11 R410A All DC Inverter Mini VRF MCAC-VTSM-2016-02 Wall mounted Wall mounted Wall mounted Wall mounted Capacity (S panel) (C panel) (R panel) (×100W) ● ● ● ● ● ● ● ● ● ● ● ● ● ● Note: If ODU connect only one IDU, the capacity of IDU should be not more than ODU.
  • Page 12 MCAC-VTSM-2016-02 R410a All DC Inverter Mini VRF Part 2 Outdoor Units 1. Specifications ..................10 2. Dimensions ..................12 3. Service Space ..................13 4. Piping Diagrams ................. 14 5. Wiring Diagrams ................. 15 6. Field Wiring ..................16 7. Capacity Tables .................. 17 8.
  • Page 13 R410a All DC Inverter Mini VRF MCAC-VTSM-2016-02 1. Specifications MDV-120W/DGN1 MDV-140W/DGN1 MDV-160W/DGN1 Sale Model Power supply V-Ph-Hz 380-415V 3N~50/60Hz Capacity 12.5 14.0 16.0 Cooling Input 3.31 3.95 4.66 kW/ kW 3.78 3.54 3.43 Capacity 14.0 16.0 17.5 Heating Input 3.68 4.32...
  • Page 14 MCAC-VTSM-2016-02 R410a All DC Inverter Mini VRF unit (W×H×D) Packing 1030×1456×435 (W×H×D) Net/Gross weight 95/105 99/109 100/110 Type R410A Refrigerant Charged volume 2800 3200 3800 Throttle type Electronic expansion valve Design pressure 4.4/2.6 Ф9.53/Ф15.9 Ф9.53/Ф15.9 Ф9.53/Ф19.1 Liquid side/ Gas side Max.
  • Page 15 R410a All DC Inverter Mini VRF MCAC-VTSM-2016-02 2. Dimensions Unit:mm MODEL 120/140/160 1327 Specifications&Performance...
  • Page 16 MCAC-VTSM-2016-02 R410a All DC Inverter Mini VRF 3. Service Space Unit: mm Single unit installation (Wall or obstacle) Air inlet >300 Maintain channel Air inlet >600 Air outlet Parallel connect the two units or above >300 >600 >2000 Parallel connect the front with rear sides >2000...
  • Page 17 R410a All DC Inverter Mini VRF MCAC-VTSM-2016-02 4. Piping Diagrams pressure switch High Discharge pressure temperature switch sensor Ambient 4-way temperature valve sensor seperator seperator Compressor Condenser temperature sensor Electronic expansion pressure valve liquid accumulator DC fan return motor capilary Oil separator: used to separate oil from high pressure &...
  • Page 18 R410A All DC Inverter Mini VRF MCAC-VTSM-2016 02 5. Wiring diagrams Specifications & Performances...
  • Page 19 R410a All DC Inverter Mini VRF MCAC-VTSM-2016-02 6. Field Wiring Outdoor unit X Y E P Q E L1 L2 L3 5x2.5mm Power Supply Signal wire between indoor/outdoor unit Indoor unit Indoor unit Indoor unit 3x1.0mm Branch Box Branch Box...
  • Page 20 MCAC-VTSM-2016-02 R410a All DC Inverter Mini VRF 7. Capacity Tables MDV-120W/DGN1 Cooling 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 temperature (Capacity (° C DB) index) 11.0 1.35 13.1 1.65 15.2 1.77 15.7 1.84 16.5 1.90 16.9...
  • Page 21 R410a All DC Inverter Mini VRF MCAC-VTSM-2016-02 MDV-120W/DGN1 Cooling 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 temperature (Capacity (° C DB) index) 1.14 11.1 1.42 12.8 1.69 13.7 1.82 14.6 1.96 15.7 2.03 16.1 2.09 1.16...
  • Page 22 MCAC-VTSM-2016-02 R410a All DC Inverter Mini VRF MDV-120W/DGN1 Cooling 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 temperature (Capacity (° C DB) index) 0.92 1.10 10.6 1.30 11.3 1.42 12.0 1.51 13.5 1.74 15.0 1.99 0.93 1.12...
  • Page 23 R410a All DC Inverter Mini VRF MCAC-VTSM-2016-02 MDV-120W/DGN1 Cooling 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 temperature (Capacity (° C DB) index) 0.72 0.85 0.96 1.03 1.10 10.5 1.26 11.7 1.45 0.73 0.85 0.97 1.05 1.12...
  • Page 24 MCAC-VTSM-2016-02 R410a All DC Inverter Mini VRF MDV-120W/DGN1 Cooling 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 temperature (Capacity (° C DB) index) 0.53 0.62 0.71 0.74 0.78 0.89 0.96 0.54 0.63 0.72 0.75 0.80 0.90 0.97...
  • Page 25 R410a All DC Inverter Mini VRF MCAC-VTSM-2016-02 MDV-120W/DGN1 Heating Indoor temperature(° C WB) Outdoor Air Combination temperature(° C (Capacity index) ° C DB ° C WB -13.7 9.95 2.91 9.91 3.08 9.87 3.25 9.87 3.33 9.82 3.41 9.82 3.58 -11.8 10.36...
  • Page 26 MCAC-VTSM-2016-02 R410a All DC Inverter Mini VRF MDV-120W/DGN1 Heating Indoor temperature(° C WB) Outdoor Air Combination temperature(° C (Capacity index) ° C DB ° C WB -13.7 9.82 3.58 9.78 3.71 9.73 3.84 9.73 3.91 9.73 3.97 9.69 4.10 -11.8 10.22...
  • Page 27 R410a All DC Inverter Mini VRF MCAC-VTSM-2016-02 MDV-120W/DGN1 Heating Indoor temperature(° C WB) Outdoor Air Combination temperature(° C (Capacity index) ° C DB ° C WB -13.7 9.67 4.26 9.62 4.35 9.62 4.44 9.45 4.38 9.13 4.20 8.51 3.85 -11.8 10.07...
  • Page 28 MCAC-VTSM-2016-02 R410a All DC Inverter Mini VRF MDV-140W/DGN1 Cooling 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 temperature (Capacity (° C DB) index) 12.3 1.61 14.6 1.97 17.0 2.11 17.7 2.20 18.5 2.26 18.9 2.46 19.4 2.47...
  • Page 29 R410a All DC Inverter Mini VRF MCAC-VTSM-2016-02 MDV-140W/DGN1 Cooling 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 temperature (Capacity (° C DB) index) 10.4 1.36 12.4 1.70 14.5 2.02 15.5 2.17 16.5 2.34 17.7 2.43 18.1 2.50...
  • Page 30 MCAC-VTSM-2016-02 R410a All DC Inverter Mini VRF MDV-140W/DGN1 Cooling 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 temperature (Capacity (° C DB) index) 1.10 10.2 1.31 11.8 1.55 12.6 1.69 13.4 1.80 15.0 2.07 16.7 2.37 1.11...
  • Page 31 R410a All DC Inverter Mini VRF MCAC-VTSM-2016-02 MDV-140W/DGN1 Cooling 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 temperature (Capacity (° C DB) index) 0.86 1.01 1.14 1.23 10.4 1.31 11.7 1.50 13.0 1.72 0.87 1.01 1.15 1.25...
  • Page 32 MCAC-VTSM-2016-02 R410a All DC Inverter Mini VRF MDV-140W/DGN1 Cooling 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 temperature (Capacity (° C DB) index) 0.64 0.74 0.85 0.89 0.94 1.06 1.15 0.64 0.75 0.86 0.90 0.95 1.08 1.16...
  • Page 33 R410a All DC Inverter Mini VRF MCAC-VTSM-2016-02 MDV-140W/DGN1 Heating Indoor temperature(° C WB) Outdoor Air Combination temperature(° C (Capacity index) ° C DB ° C WB -13.7 11.38 3.42 11.33 3.61 11.28 3.81 11.28 3.90 11.23 4.01 11.23 4.20 -11.8 11.84...
  • Page 34 MCAC-VTSM-2016-02 R410a All DC Inverter Mini VRF MDV-140W/DGN1 Heating Indoor temperature(° C WB) Outdoor Air Combination temperature(° C (Capacity index) ° C DB ° C WB -13.7 11.23 4.21 11.17 4.36 11.12 4.51 11.12 4.59 11.12 4.66 11.07 4.81 -11.8 11.68...
  • Page 35 R410a All DC Inverter Mini VRF MCAC-VTSM-2016-02 MDV-140W/DGN1 Heating Indoor temperature(° C WB) Outdoor Air Combination temperature(° C (Capacity index) ° C DB ° C WB -13.7 11.05 5.00 11.00 5.11 11.00 5.22 10.79 5.14 10.44 4.93 9.73 4.52 -11.8 11.50...
  • Page 36 MCAC-VTSM-2016-02 R410a All DC Inverter Mini VRF MDV-160W/DGN1 Cooling 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 temperature (Capacity (° C DB) index) 14.0 1.90 16.7 2.32 19.4 2.49 20.2 2.59 21.1 2.66 21.6 2.90 22.2 2.92...
  • Page 37 R410a All DC Inverter Mini VRF MCAC-VTSM-2016-02 MDV-160W/DGN1 Cooling 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 temperature (Capacity (° C DB) index) 11.9 1.61 14.2 2.00 16.5 2.39 17.6 2.56 18.8 2.76 20.2 2.86 20.6 2.95...
  • Page 38 MCAC-VTSM-2016-02 R410a All DC Inverter Mini VRF MDV-160W/DGN1 Cooling 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 temperature (Capacity (° C DB) index) 1.29 11.6 1.55 13.5 1.83 14.4 2.00 15.3 2.13 17.2 2.44 19.1 2.80 1.31...
  • Page 39 R410a All DC Inverter Mini VRF MCAC-VTSM-2016-02 MDV-160W/DGN1 Cooling 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 temperature (Capacity (° C DB) index) 1.02 1.19 10.5 1.35 11.2 1.45 11.9 1.55 13.4 1.77 14.9 2.04 1.03 1.20...
  • Page 40 MCAC-VTSM-2016-02 R410a All DC Inverter Mini VRF MDV-160W/DGN1 Cooling 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 temperature (Capacity (° C DB) index) 0.75 0.87 1.00 1.05 1.11 1.26 10.6 1.36 0.76 0.89 1.01 1.06 1.13 1.28...
  • Page 41 R410a All DC Inverter Mini VRF MCAC-VTSM-2016-02 MDV-160W/DGN1 Heating Indoor temperature(° C WB) Outdoor Air Combination temperature (° C (Capacity index) ° C DB ° C WB -13.7 12.44 3.89 12.39 4.12 12.33 4.34 12.33 4.45 12.28 4.56 12.28 4.79 -11.8...
  • Page 42 MCAC-VTSM-2016-02 R410a All DC Inverter Mini VRF MDV-160W/DGN1 Heating Indoor temperature(° C WB) Outdoor Air Combination temperature (° C (Capacity index) ° C DB ° C WB -13.7 12.28 4.79 12.22 4.96 12.17 5.14 12.17 5.23 12.17 5.31 12.11 5.48 -11.8...
  • Page 43 R410a All DC Inverter Mini VRF MCAC-VTSM-2016-02 MDV-160W/DGN1 Heating Indoor temperature(° C WB) Outdoor Air Combination temperature (° C (Capacity index) ° C DB ° C WB -13.7 12.08 5.70 12.03 5.82 12.03 5.94 11.81 5.85 11.42 5.62 10.64 5.15 -11.8...
  • Page 44 MCAC-VTSM-2016-02 R410a All DC Inverter Mini VRF 6. Electric Characteristics Power Supply Compressor Model Min. Max. Voltage TOCA MDV-120W/DGN1 50/60 380-415 16.25 9.95 2×0.1 2×0.9 MDV-140W/DGN1 50/60 380-415 17.5 9.95 2×0.1 2×0.9 MDV-160W/DGN1 50/60 380-415 17.5 9.95 2×0.1 2×0.9 Remark: Mop: Total Over-current Amps.
  • Page 45 R410a All DC Inverter Mini VRF MCAC-VTSM-2016-02 7. Sound Levels Model Noise level dB(A) Height (m) MDV-120W/DGN1 MDV-140W/DGN1 MDV-160W/DGN1 Specifications&Performance...
  • Page 46 MCAC-VTSM-2016-02 R410a All DC Inverter Mini VRF 8. Operation Limits Cooling Heating Indoor temperature ( DB) Indoor temperature ( WB) Mode Outdoor temp. Indoor temp. Room relative humidity Cooling mode -15° C ~ 46° C 17° C ~ 32° C below 80% ───...
  • Page 47 R410A All DC Inverter Mini VRF MCAC-VTSM-2016-02 Part 3 Installation 1. Precautions ....................45 2. Accessories ....................46 3. Outdoor Unit Installation ................47 4. Piping Installation ..................49 5. Electric Wiring Installations ................. 53 6. Outdoor Unit Wiring ..................56 7.
  • Page 48 MCAC-VTSM-2016-02 R410A All DC Inverter Mini VRF 1. Precautions  Ensure that all Local, National and International regulations are satisfied.  Read this “PRECAUTIONS” carefully before Installation.  The precautions described below include the important Items regarding safety.  Observe them without fail.
  • Page 49 R410A All DC Inverter Mini VRF MCAC-VTSM-2016-02 If the air conditioner is not installed appropriately, accidents may occur due to the falling unit. Electrical work must be performed by a qualified electrician in accordance with the Installation Manual. Make sure the air conditioner uses an exclusive power supply. An insufficient power supply capacity or inappropriate installation may cause fire.
  • Page 50 MCAC-VTSM-2016-02 R410A All DC Inverter Mini VRF 3. Outdoor Unit Installation 3.1 Installation space selection Install the outdoor unit at a place where discharge air is not blocked. When an outdoor unit is installed in a place that is always exposed ...
  • Page 51 R410A All DC Inverter Mini VRF MCAC-VTSM-2016-02 Fix with bolt Single unit installation (Wall or obstacle) Air inlet >300 Maintain channel Air inlet >600 Air outlet Parallel connect two units or above >300 >600 >2000 Parallel connect the front with rear sides >2000...
  • Page 52 MCAC-VTSM-2016-02 R410A All DC Inverter Mini VRF 3.3 Water Outlet Four condensed water outlets on the chassis for selection display as the follow figure: While installing the outdoor unit, pay attention to the installation place and the drainage pattern; if it’s installed at the alpine zone, the frozen condensed water will block up the water outlet, please pull out the rubber stopper of the reserve water outlet.
  • Page 53 R410A All DC Inverter Mini VRF MCAC-VTSM-2016-02 Note: When the total equivalent piping length of liquid + gas side is ≥90m, it must increase the size of air side main pipe. Besides, according to the distance of refrigerant pipe and the over matched state of indoor unit, when the capacity is decreasing it still can increase the gas side main pipe size.
  • Page 54 MCAC-VTSM-2016-02 R410A All DC Inverter Mini VRF 4.3 Refrigerant pipe selection The first connecting method Outdoor Unit The first Line Branch Pipe The second connecting method Outdoor Unit(Take Model 160 for example) (28) intdoor Units (28) (28) The first Line Branch Pipe...
  • Page 55 R410A All DC Inverter Mini VRF MCAC-VTSM-2016-02 Table 2: Indoor unit main pipes selection (L1~L5) Total capacity of Main pipe size(mm) downstream indoor units Branch Pipe Gas pipe Liquid pipe (kW) Φ15.9 Φ9.53 A＜16.6 FQZHN-01D 16.6≤A＜23 Φ19.1 Φ9.53 FQZHN-01D Table 3: Main pipes selection (L1)
  • Page 56 MCAC-VTSM-2016-02 R410A All DC Inverter Mini VRF 4.7 Additional refrigerant charge Calculate the added refrigerant according to the diameter and the length of the liquid side pipe of the outdoor unit/indoor unit connection. Liquid Side Piping Diameter Refrigerant to be Added Perimeter Piping Φ6.4...
  • Page 57 R410A All DC Inverter Mini VRF MCAC-VTSM-2016-02 9) When connecting wiring and wire holder, use cable clamp to fix and make sure no exposure. 10) Refrigerant piping system and wiring system of indoor and outdoor unit belongs to the different system.
  • Page 58 MCAC-VTSM-2016-02 R410A All DC Inverter Mini VRF 5.4 Indoor unit power supply wiring Indoor Power Supply Circuit Breaker Manual swtich Wire Distribution Box Indoor Unit 5.5 Indoor/Outdoor unit signal wire wiring Indoor/Outdoor unit signal wire wiring Outdoor Unit Close end of the connection shielded wire...
  • Page 59 R410A All DC Inverter Mini VRF MCAC-VTSM-2016-02 6. Outdoor Unit Wiring The Specification of Power Table 6-1 Capacity 120 model 140 model 160 model Phase 3 phase 3 phase 3 phase Voltage and 380-415V 3N~50/60Hz Outdoor Unit power Frequency Power...
  • Page 60 MCAC-VTSM-2016-02 R410A All DC Inverter Mini VRF 7. Test Running Operate according to “key points for test running” on the electric control box cover. CAUTION  Test running cannot start until the outdoor unit has been connected to the power for 12hours.
  • Page 61 R410A All DC Inverter Mini VRF MCAC-VTSM-2016-02 Part 4 Troubleshooting 1. PCB ports instructions ............... 59 2. PCB parts instructions ............... 60 3. Error code table ................... 63 4. Troubleshooting .................. 64 Troubleshooting...
  • Page 62 MCAC-VTSM-2016-02 R410A All DC Inverter Mini VRF PCB ports instructions PCB ports instruction Content Port voltage Inspection port for inverter module voltage DC 540V,DC 15V Mutual inductor for compressor DC current In dynamic change 3 CN201 Activation port of inverter module The left the first pin:DC 3.3V...
  • Page 63 R410A All DC Inverter Mini VRF MCAC-VTSM-2016-02 2. PCB parts instructions LED digital SW2: Query tube display button Function setting SW1: dial switch Forced cooling UPD78F0537 button IRMCF341 2.1 SW2 query instructions Content Note Normal display ---- Running mode 0-Standby;2-Cooling;3-Heating;4-Forced Cooling...
  • Page 64 MCAC-VTSM-2016-02 R410A All DC Inverter Mini VRF 2.2 Function setting dial switches instruction Troubleshooting...
  • Page 65 R410A All DC Inverter Mini VRF MCAC-VTSM-2016-02 2.3 LED on PCB instructions LED 1 (Red) LED 2(Green) LED1: Malfunction indicator lamp of inverter module. The lamp will be off if the system running is normal. And it will be on if the inverter module is faulty and the error code will display on digital tube.
  • Page 66 MCAC-VTSM-2016-02 R410A All DC Inverter Mini VRF 3. Error code table Error code Content Communication malfunction between the indoor unit and outdoor unit Pipe temperature T3& ambient temperature T4 sensor malfunction Outdoor unit voltage protection DC fan malfunction Discharge temperature sensor malfunction EEFROM malfunction E.9.
  • Page 67 R410A All DC Inverter Mini VRF MCAC-VTSM-2016-02 4. Troubleshooting 4.1 E9: EEPROM malfunction The malfunction may be caused by two reasons: 1) The EEPROM is not inserted well;2) Outdoor main board is broken. LED display E0 or E9 EEPROM malfunction...
  • Page 68 MCAC-VTSM-2016-02 R410A All DC Inverter Mini VRF 4.2 E2: Communication malfunctions between indoor unit chip and outdoor unit chip. LED displays E2 Communication malfunctions between indoor unit chip and outdoor unit chip. Judge 1: Check whether the indoor unit is Plug the indoor unit in.
  • Page 69 R410A All DC Inverter Mini VRF MCAC-VTSM-2016-02 4.3 H0: Communication malfunction betweem IR341/main board LED displays E3/H0 Communication malfunction between outdoor PCB Check whether the indicator lights LED on Replace the outdoor main board the main board are flashing Check...
  • Page 70 MCAC-VTSM-2016-02 R410A All DC Inverter Mini VRF 4.4 E4: T3&T4 sensor malfunction displays Judge: T3&T4 sensor malfunction Replace T3/T4 sensor Judge: whether the body is broken. Connect the wire again. Judge whether temperature sensor pin connects Connect again. properly. Replace main PCB 4.5 E5: Voltage protection malfunction...
  • Page 71 R410A All DC Inverter Mini VRF MCAC-VTSM-2016-02 4.6 E6:DC Fan Error The error may be caused by two reasons: 1). The wiring connection is wrong; 2). Power supply voltage is not normal. LED displays E6 Outdoor unit DC fan cannot work.
  • Page 72 MCAC-VTSM-2016-02 R410A All DC Inverter Mini VRF 4.7 E7: Discharge Sensor Malfunction LED displays E7/EA System faulty that T3 pipe temperature exceeds 27 degrees for more than 5 minutes under heating mode. Whether the outdoor ambient temperature is higher than Belongs to system the unit’s operating condition under heating mode.
  • Page 73 R410A All DC Inverter Mini VRF MCAC-VTSM-2016-02 4.9 P1 malfunction: High pressure protection displays High pressure protection Judge 1: whether the wiring is correct. Connect again. Judge 2: whether the wire body is broken. Judge: short-circuit high pressure switch. Check the Replace the high pressure system can operate normally.
  • Page 74 MCAC-VTSM-2016-02 R410A All DC Inverter Mini VRF 4.10 P2: Low pressure protection displays Low pressure protection Judge 1: whether wiring connection between low pressure Connect well switch and PCB is connected well or properly. again. Judge 2: whether the low pressure switch is damaged.
  • Page 75 R410A All DC Inverter Mini VRF MCAC-VTSM-2016-02 4.11 P3: Compressor current protection It will protect when input current is more than 15A. It will recover when input current is less than 15A. It will recover automatically. LED displays P3 Input current protection Judge 1: check whether the input current of the power wire is more than 15A.
  • Page 76 MCAC-VTSM-2016-02 R410A All DC Inverter Mini VRF 4.12 P4:Compressor discharged temperature protection When the discharged temperature of the compressor is higher than 115° C, the unit will stop running. When the discharged temperature of the compressor is lower than 90° C , the unit resumes normal operation automatically.
  • Page 77 R410A All DC Inverter Mini VRF MCAC-VTSM-2016-02 4.13 P5: Condenser high temperature protection When condenser temperature is higher than 62 degrees for 3 seconds, the unit will stop operating. When pipe temperature outside is lower than 52 degrees, the unit will resume operate.
  • Page 78 MCAC-VTSM-2016-02 R410A All DC Inverter Mini VRF 4.14 P6: IPM Module protection LED displays P6 IPM module protection Adjust to the right range. Then check Check whether the input power is whether the system Check whether P-N voltage on the IPM module correct.
  • Page 79 R410A All DC Inverter Mini VRF MCAC-VTSM-2016-02 1.1 DC generatrix detection 1.2 Voltage check of DC generatrix 1.2.1 Check the voltage of DC generatrix, which is normal between 510V and 580V. If less , go to next step. 1.2.2 Check the rectification circuit. Find out any loose in the circuit. Moreover check the filter board, rectifier stacks.
  • Page 80 MCAC-VTSM-2016-02 R410A All DC Inverter Mini VRF 2.3 The resistance between 1, 2,3,4,5 should be infinite. If any of them is about 0, which means the module has already been broken down; we need to replace the module. 3 Compressor's characteristics 3.1 Measure the resistance among the compressor's U, V, W respectively.
  • Page 81 R410A All DC Inverter Mini VRF MCAC-VTSM-2016-02 In normal situation: LED 1: Flash in 1Hz (slowly flash) when standby LED 1: On when running LED 2: Off Phenomenon A LED 2 red ON LED 1 green Flashes 8 times and stops for 1S, then repeat.
  • Page 82 MCAC-VTSM-2016-02 R410A All DC Inverter Mini VRF 4.15 PE malfunction: Evaporator T2 high temperature protection When the middle average temperature of the evaporator is higher than 63 degrees for 50 seconds, the unit will stop operating. When pipe temperature is lower than 50 degrees, the unit will resume running.
  • Page 83 R410A All DC Inverter Mini VRF MCAC-VTSM-2016-02 4.16 P8: Typhoon protection displays Typhoon protection When air conditioner is standby or in malfunction stopping status, Belongs to normal protection check if there is strong air blows the fan phenomenon. Check whether the fan motor is normal.
  • Page 84 Commercial Air Conditioner Division Midea Group Address: Midea Headquarters Building, 6 Midea Avenue, Beijiao, Shunde, Foshan, Guangdong, China Midea CAC After-service Application Midea CAC News Application Postal code: 528311 Tel: +86-757-26338346 Fax: +86-757-22390205 cac.midea.com global.midea.com Note: Product speci cations change from time to time as product improvements and...

This manual is also suitable for:

Mdv-120w/dgn1Mdv-140w/dgn1Mdv-160w/dgn1

Table of Contents

Save PDF