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MDV AtomC Series Service Manual

Commercial air conditioners
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Model:
AtomC Series
MDVO-AtC28V2R1
MDVO-AtC36V2R1
MDVO-AtC42V2R1
Commercial Air Conditioners
MDVO-AtC48V2R1
MDVO-AtC56V2R1
MDVO-AtC60V2R1
R410A

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  • Page 1 R410A Commercial Air Conditioners Service Manual AtomC Series Model: MDVO-AtC28V2R1 MDVO-AtC48V2R1 MDVO-AtC36V2R1 MDVO-AtC56V2R1 MDVO-AtC42V2R1 MDVO-AtC60V2R1...
  • Page 2 AtomC Series VRF 50/60Hz CONTENTS Part 1 General Information ................3 Part 2 Component Layout and Refrigerant Circuits ........13 Part 3 Control ....................19 Part 4 Field Settings ..................25 Part 5 Electrical Components and Wiring Diagrams ........35...
  • Page 3 AtomC Series VRF 50/60Hz...

  • Page 4: Table Of Contents

    AtomC 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

    AtomC 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 Compact Four-way Cassette Four-way Cassette Duct Wall-mounted Table 1-1.2: Indoor unit capacity range Capacity Capacity kBtu/h index —...

  • Page 6: External Appearance

    AtomC Series VRF 50/60Hz 2 External Appearance 2.1 Indoor Units Table 1-2.1: Indoor unit appearance Compact Four-way Cassette Four-way Cassette Duct Wall-mounted 2.2 Outdoor Units Table 1-2.2: Outdoor unit appearance 28/36/42kBtu/h 48/56/60kBtu/h...

  • Page 7: Nomenclature

    C4: Four-way Cassette WV: Wall-mounted D: Duct Refrigerant type (2R: R410A&R32) E: 1 phase, 220-240V, 50Hz 2D: 1 phase, 220-240V, 50/60Hz 3.2 Outdoor Units MDV O - At C 05 V2 ① ② ③ ④ ⑤ ⑥ ⑦ ⑧ Legend...

  • Page 8: Combination Ratio

    AtomC 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...

  • Page 9: Selection Procedure

    AtomC 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)
  • Page 10 AtomC 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 AtomC Series VRF 50/60Hz Table 1-5.2: Extract from duct (T) 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 Model index 20°C DB 23°C DB 26°C DB 27°C DB 28°C DB...
  • Page 12 AtomC 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. § Calculate the corrected capacity of the outdoor unit: The sum of the indoor unit CIs is 120 and the CI of the 10kW outdoor unit is 100, so the combination ratio is 120 / 100 = 120%.
  • Page 13 AtomC Series VRF 50/60Hz 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. For the 10kW unit is not suitable, try to select 12kW unit.

  • Page 14: Refrigerant Circuits

    AtomC Series VRF 50/60Hz Part 2 Component Layout and Refrigerant Circuits 1 Piping Diagrams ..................14 2 Refrigerant Flow Diagrams ..............16...

  • Page 15: Piping Diagrams

    AtomC Series VRF 50/60Hz 1 Piping Diagrams Figure 2-1.1: 28/36/42 model Piping diagram...
  • Page 16 AtomC Series VRF 50/60Hz Figure 2-1.2: 48/56/60 model Piping diagram 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. Accumulator: Stores liquid refrigerant and oil to protect compressor from liquid hammering.

  • Page 17: Refrigerant Flow Diagrams

    AtomC Series VRF 50/60Hz 2 Refrigerant Flow Diagrams 28/36/42 models cooling operation Figure 2-2.1: Refrigerant flow during cooling operation $6,*O'%LT%-&'8-%V *6,*T-%NN8-%,&N $6,*O'%LT%-&'8-%V *6,*T-%NN8-%O:6X86< =0>O'%LT%-&'8-%VO:0>T-%NN8-%O,&N .*%-L0N'&'O34 GHI-H.LMN2PL#45ST !"# $%&' !EF*&H,%- 5&H34 84VLMN2PL#45ST .*%-L0N'&' 355 !"# $%&' !EF*&H,%- 5&H34 !"# !"# $%&' !EF*&H,%- 5&H355...
  • Page 18 AtomC Series VRF 50/60Hz 48/56/60 models cooling operation Figure 2-2.1: 48/56/60 models refrigerant flow during cooling operation $6,*O'%LT%-&'8-%V *6,*T-%NN8-%,&N $6,*O'%LT%-&'8-%V *6,*T-%NN8-%O:6X86< =0>O'%LT%-&'8-%VO:0>T-%NN8-%O,&N .*%-L0N'&'O34 GHI-H.LMN2PL#45ST !"# $%&' !EF*&H,%- 5&H34 84VLMN2PL#45ST .*%-L0N'&' 355 !"# $%&' !EF*&H,%- 5&H34 !"# !"# $%&' !EF*&H,%- 5&H355 48/56/60 models oil return operation in cooling mode Figure 2-2.4: 48/56/60 models refrigerant flow during oil return operation in cooling mode...
  • Page 19 AtomC Series VRF 50/60Hz...
  • Page 20 AtomC Series VRF 50/60Hz Part 3 Control 1 General Control Scheme Flowchart ............20 2 Stop Operation ..................21 3 Startup Control ..................21 4 Normal Operation Control ............... 22 5 Protection Control ................... 23 6 Standby Control ..................24...

  • Page 21: General Control Scheme Flowchart

    AtomC Series VRF 50/60Hz 1 General Control Scheme Flowchart Sections 3-2 to 3-7 on the following pages detail when each of the controls in the flowchart below is activated. Stop operation § Abnormal shutdown § System stop Thermo on Startup control §...

  • Page 22: Stop Operation

    AtomC Series VRF 50/60Hz 2 Stop Operation The stop operation occurs for one of the two following reasons: 1. Abnormal shutdown: in order to protect the compressors, if an abnormal state occurs the system makes a 'stop with thermo off' operation and an error code is displayed on the outdoor unit digital displays.

  • Page 23: Normal Operation Control

    AtomC Series VRF 50/60Hz 4 Normal Operation Control 4.1 Component Control during Normal Operation Table 3-4.1: Component control during normal cooling operation Wiring diagram Component 28-60 model Control functions and states label Inverter compressor COMP Controlled according to load requirement ●...

  • Page 24: Protection Control

    AtomC Series VRF 50/60Hz 5 Protection Control 5.1 High Pressure Protection Control This control protects the system from abnormally high pressure and protects the compressors from transient spikes in pressure. Figure 3-5.1: High pressure protection control Normal operation > 4.4MPa <...

  • Page 25: Standby Control

    AtomC Series VRF 50/60Hz 5.4 Compressor and Inverter Module Protection Control This control protects the compressors from abnormally high currents and protects the inverter modules from abnormally high temperatures. Figure 3-5.4: Compressor current protection control Normal operation Current ≥ Current Current <...

  • Page 26: Field Settings

    AtomC Series VRF 50/60Hz Part 4 Field Settings 1 Outdoor Unit Field Settings ..............26...
  • Page 27 AtomC Series VRF 50/60Hz 1 Outdoor Unit Field Settings Figure 4-1.1: 28 model outdoor unit main PCB Figure 4-1.2: 28 model outdoor unit communication switchboard...
  • Page 28 AtomC Series VRF 50/60Hz Table 4-1.1: 28 model outdoor unit main PCB switch settings Switch Switch Setting Description positions Press SW1 to enter the forced cooling function; Force cooling Press it again to exit the forced cooling function. Spot check...
  • Page 29 AtomC Series VRF 50/60Hz Figure 4-1.3: 36/42 model outdoor unit main PCB Figure 4-1.4: 36/42 model outdoor unit communication switchboard...
  • Page 30 AtomC Series VRF 50/60Hz Table 4-1.2: 36/42 model outdoor unit main PCB switch settings Switch Switch Setting Description positions Press SW1 to enter the forced cooling function; Force cooling press it again to exit the forced cooling function. Spot check...
  • Page 31 AtomC Series VRF 50/60Hz Table 4-1.2: 36/42 model outdoor unit main PCB switch settings (continued) Switch Switch Setting Description positions S4=0000 Network address of ODU: 0(default) S4=1000 Network address of ODU: 1 S4=0100 Network address of ODU: 2 S4=1100 Network address of ODU: 3...
  • Page 32 AtomC Series VRF 50/60Hz Figure 4-1.3: 48/56/60 model outdoor unit main PCB Figure 4-1.4: 48/56/60 model outdoor unit communication switchboard...
  • Page 33 AtomC Series VRF 50/60Hz Table 4-1.2: 48/56/60 model outdoor unit main PCB switch settings Switch Switch Setting Description positions Press SW1 to enter the forced cooling function; Force cooling press it again to exit the forced cooling function. Spot check...
  • Page 34 AtomC Series VRF 50/60Hz Table 4-1.2: 36/42 model outdoor unit main PCB switch settings (continued) Switch Switch Setting Description positions S4=0000 Network address of ODU: 0(default) S4=1000 Network address of ODU: 1 S4=0100 Network address of ODU: 2 S4=1100 Network address of ODU: 3...
  • Page 35 AtomC Series VRF 50/60Hz Table 4-1.3: Spot check display table (for all model) Parameters displayed on DSP Remarks Actual value = value displayed Operating frequency Operating mode Refer to Note 1 Operating fan speed level Refer to Note 2 Total capacity requirement of indoor units...
  • Page 36 AtomC Series VRF 50/60Hz are less than 10 since start-up.

  • Page 37: Wiring Diagrams

    AtomC Series VRF 50/60Hz Part 5 Electrical Components and Wiring Diagrams 1 Outdoor Unit Electric Control Box Layout ..........36 2 Outdoor Unit Main PCB ................38 3 Wiring Diagrams ..................43...
  • Page 38 AtomC Series VRF 50/60Hz 1 Outdoor Unit Electric Control Box Layout Figure 5-1.1: Front view of 28 model electric control box Power input and power filter Module board PFC inductor IPM module DC fan motor control module Output control assembly Communication converter board Figure 5-1.2: Front view of 36/42 model electric control box...
  • Page 39 AtomC Series VRF 50/60Hz Figure 5-1.3: Front view of 60 model electric control box IPM module Switching power supply module Four-way valve Main control board...

  • Page 40: Outdoor Unit Main Pcb

    AtomC Series VRF 50/60Hz 2 Outdoor Unit Main PCB 2.1 Ports Figure 5-2.1: 28 model outdoor unit main PCB ports Table 5-2.1: 28 model main PCB ports Label in Port code Content Port voltage Figure 5-1.1 CN6/CN6-1 Earth N-IN Power input-N...
  • Page 41 AtomC Series VRF 50/60Hz Figure 5-2.2: 36/42 model outdoor unit main board ports Table 5-2.2: 36/42 model outdoor unit main board ports Label in Code Content Port voltage Figure 5-1.2 Power input-N AC 220V Earth Power input-L AC 220V Pin 1: DC12V;...
  • Page 42 AtomC Series VRF 50/60Hz Figure 5-2.3: 48/56/60 model outdoor unit main board ports Table 5-2.4: 48/56/60 model outdoor unit main board ports Label in Code Content Port voltage Figure 5-1.2 Power input-N AC 220V Earth Power input-L AC 220V Pin 1: DC12V;...
  • Page 43 AtomC Series VRF 50/60Hz Figure 5-2.3: 28/32/42/48/56/60 model outdoor unit communication converter board PCB Ports Table 5-2.3: 28/32/42/48/56/60 model communication converter board PCB ports Label in Port code Content Port voltage Figure 5-1.3 P Q E X Y E communication port 2.5-2.7V DC...
  • Page 44 AtomC Series VRF 50/60Hz 2.2 Components 2.2.1 Function of buttons SW1 to SW2 Table 5-2.5: Function of buttons SW1 to SW2 Model Button Function Picture Force cooling button 36-60 Check button 2.2.2 Digital display output Table 5-2.6: Digital display output in different operating states...
  • Page 45 AtomC Series VRF 50/60Hz 3 Wiring Diagrams Figure 2-5.2: 28/36/42 model wiring diagram Component code Description Component code Description CH1-CH5 Magnetic ring Outdoor heat exchanger temperature sensor COMP. Compressor Outdoor ambient temperature sensor DC fan Discharge temperature sensor Electronic expansion valve...
  • Page 46 AtomC Series VRF 50/60Hz Figure 2-5.3: 48/56/60 model wiring diagram Component code Description Component code Description Outdoor heat exchanger temperature CHI-CH8 Magnetic ring sensor COMP. Compressor Outdoor ambient temperature sensor DC fan Discharge temperature sensor Electronic expansion valve Refrigerant radiator temperature sensor...

  • Page 47: Troubleshooting

    AtomC Series VRF 50/60Hz Part 6 Diagnosis and Troubleshooting 1 Error Code Table ..................46 2 Troubleshooting ..................47...

  • Page 48: Error Code Table

    AtomC Series VRF 50/60Hz 1 Error Code Table Table 6-1.1: Error code table Error code Content Note Communication fault between Inverter module Board and communication terminals All models block All models Communication error between indoor and outdoor unit All models...
  • Page 49 AtomC Series VRF 50/60Hz 2 Troubleshooting 2.1 Warning Warning § All electrical work must be carried out by competent and suitably qualified, certified and accredited professionals and in accordance with all applicable legislation (all national, local and other laws, standards, codes, rules, regulations and other legislation that apply in a given situation).
  • Page 50 AtomC Series VRF 50/60Hz 2.2.5 Procedure To check whether the four-digit plug sequences of the communication cables of the module board and the communication board are consistent (5V/GND/T/R), loose, and Communication line each wire sequence is on, use the following methods: Put the...
  • Page 51 AtomC Series VRF 50/60Hz 2.3 E2: Communication error between indoor and outdoor unit (For all models) 2.3.1 Digital display output 2.3.2 Description § Communication error between indoor and outdoor unit. § The system stops running. § Error code is displayed on the outdoor unit PCB.
  • Page 52 AtomC Series VRF 50/60Hz Communication wires are close to a source Remove the source of interference, or of electromagnetic radiation such as add additional shielding to the transformer or strong fluorescent lamp communication wires The length of communication wire is over...
  • Page 53 AtomC Series VRF 50/60Hz Figure 6-2.1: Indoor unit installation Notes: Communication wires should be shield wire and indoor units should be connected in series.
  • Page 54 AtomC Series VRF 50/60Hz 2.4 E4: Temperature sensor (T3/T4) fault (For all models) 2.4.1 Digital display output 2.4.2 Description § Outdoor heat exchanger temperature sensor (T3) error or outdoor ambient temperature sensor (T4) error. § The system stops running. § Error code is displayed on the outdoor unit PCB.
  • Page 55 AtomC Series VRF 50/60Hz 2.5 E5: Abnormal power supply voltage (For all models) 2.5.1 Digital display output 2.5.2 Description § Abnormal power supply voltage. § The system stops running. § Error code is displayed on the outdoor unit PCB. 2.5.3 Trigger / recover condition §...
  • Page 56 AtomC Series VRF 50/60Hz 2.6 E6: DC fan motor error; Eb: E6 protection appears 6 times in one hour (For all models) 2.6.1 Digital display output E6 or Eb 2.6.2 Description § E6:DC fan motor error; Eb: E6 protection appears 6 times in one hour §...
  • Page 57 AtomC Series VRF 50/60Hz 2.7 E9: EEPROM error (For all models) 2.7.1 Digital display output 2.7.2 Description § EEPROM error § The system stops running. § Error code is displayed on the outdoor unit PCB. 2.7.3 Trigger / recover condition §...
  • Page 58 AtomC Series VRF 50/60Hz 2.8 E.9.: Compressor parameters mismatch (For all modes) 2.8.1 Digital display output E.9. 2.8.2 Description § Main control chip detect the power setting number mismatch the model, the unit will display E.9. error. § The system stops running.
  • Page 59 AtomC Series VRF 50/60Hz 2.9 EF: PFC fault (Only for 36~48 model) 2.9.1 Digital display output 2.9.2 Description § PFC fault protection. § The system stops running. § Error code is displayed on the outdoor unit PCB. 2.9.3 Trigger / recover condition §...
  • Page 60 AtomC Series VRF 50/60Hz 2.10 EH: Refrigerant radiator temperature sensor error (For all models) 2.10.1 Digital display output 2.10.2 Description § Refrigerant radiator temperature TL sensor error. § The system stops running. § Error code is displayed on outdoor unit PCB.
  • Page 61 AtomC Series VRF 50/60Hz 2.11 EP: Outdoor ambient temperature is lower than -15 in cooling operation (For all models) ℃ 2.11.1 Digital display output 2.11.2 Description § Outdoor ambient temperature is lower than -15℃ in cooling operation. § The system stops running.
  • Page 62 AtomC Series VRF 50/60Hz 2.12 F1: DC bus voltage protection (For all models) 2.12.1 Digital display output 2.12.2 Description § F1 indicates DC bus voltage protection. § The system stops running. § Error code is displayed on the outdoor unit PCB.
  • Page 63 AtomC Series VRF 50/60Hz 2.13 H7: Number of indoor unit detected is increase or decrease (For all models) 2.13.1 Digital display output 2.13.2 Description § Number of indoor unit detected is increase or decrease protection. § The system stops running.
  • Page 64 AtomC Series VRF 50/60Hz 2.14 P1: Discharge pipe high pressure protection(For all models) 2.14.1 Digital display output 2.14.2 Description § Discharge pipe high pressure protection. § The system stops running. § Error code is displayed on the outdoor unit PCB.
  • Page 65 AtomC Series VRF 50/60Hz The high pressure side is blocked, caused Inspect the system and fix the error by crushed or bent pipe The condenser heat exchange is poor Inspect the system and fix the error Replace outdoor main PCB Notes: Measure the resistance among the three terminals of the pressure sensor.
  • Page 66 AtomC Series VRF 50/60Hz 2.15 P2: Suction pipe low pressure protection (For all models) 2.15.1 Digital display output 2.15.2 Description § Suction pipe low pressure protection. § The system stops running. § Error code is displayed on outdoor unit PCB.
  • Page 67 AtomC Series VRF 50/60Hz Notes: Measure the resistance among the three terminals of the pressure sensor. If the resistance is of the order of mega Ohms or infinite, the pressure sensor has failed. An insufficiency of refrigerant causes compressor discharge temperature to be higher than normal, discharge and suction pressures to be lower than normal and compressor current to be lower than normal, and may cause frosting to occur on the suction pipe.
  • Page 68 AtomC Series VRF 50/60Hz 2.17 P3: Compressor current protection (For all models) 2.15.6 Digital display output 2.15.7 Description § P3 indicates current protection on compressor. § The system stops running. § Error code is displayed on the outdoor unit PCB.
  • Page 69 AtomC Series VRF 50/60Hz The condenser heat exchange is poor Inspect the system and fix the error The high pressure side is blocked, caused Inspect the system and fix the error by crushed or bent pipe or blocked EXV Inverter module has short-circuited...
  • Page 70 AtomC Series VRF 50/60Hz 2.18 P4: Discharge temperature protection (For all models) 2.18.1 Digital display output 2.18.2 Description § Discharge temperature protection. § The system stops running. § Error code is displayed on the unit with the error. 2.18.3 Trigger / recover condition §...
  • Page 71 AtomC Series VRF 50/60Hz recharge refrigerant. Add oil to the system if it leaks The condenser heat exchange is poor Inspect the system and fix the error Replace outdoor main PCB Notes: Measure sensor resistance. If the resistance is too low, the sensor has short-circuited. If the resistance is not consistent with the sensor’s resistance characteristics table, the sensor has failed.
  • Page 72 AtomC Series VRF 50/60Hz 2.19 P5: Outdoor heat exchanger temperature protection (For all models) 2.19.1 Digital display output 2.19.2 Description § Outdoor heat exchanger temperature protection. § The system stops running. § Error code is displayed on the unit with the error.
  • Page 73 AtomC Series VRF 50/60Hz Replace outdoor main PCB Notes: Measure sensor resistance. If the resistance is too low, the sensor has short-circuited. If the resistance is not consistent with the sensor’s resistance characteristics table, the sensor has failed. An indoor load that is too large causes suction and discharge temperatures to be higher than normal.
  • Page 74 AtomC Series VRF 50/60Hz 2.20 PE: Evaporator high temperature protection (For all models) 2.20.1 Digital display output 2.20.2 Description § Evaporator high temperature protection § The system stops running. § Error code is displayed on the outdoor unit PCB. 2.20.3 Trigger / recover condition §...
  • Page 75 AtomC Series VRF 50/60Hz 2.21 PL: Radiator surface high temperature protection (For all models) 2.21.1 Digital display output 2.21.2 Description § Radiator surface high temperature protection. § The system stops running. § Error code is displayed on outdoor unit PCB.
  • Page 76 AtomC Series VRF 50/60Hz 2.22 L3: Other driving errors 2.22.1 Digital display output 2.22.2 Description § Other driving errors. § The system stops running. § Error code is displayed on the outdoor unit PCB. 2.22.3 Trigger / recover condition § Trigger condition: PFCOvercurrent protection, IPM overtemperature §...
  • Page 77 AtomC Series VRF 50/60Hz 2.23 L7: Compressor phase sequence error 2.23.1 Digital display output 2.23.2 Description § Compressor phase sequence error. § compressor stop running after failure, in a minute if the fault disappear, the compressor to start again. § Error code is displayed on the outdoor unit PCB.
  • Page 78 AtomC Series VRF 50/60Hz 2.24 L0/L4/L5/L8/L9: L category of inverter module protection (L0 for all models, L4/L5/L8/L9 for 100-160 model) 2.24.1 Digital display output L0/L1/L2/L4/L5 2.24.2 Description § Compressor inverter module protection. § The system stops running. § Error code is displayed on the outdoor unit PCB.
  • Page 79 AtomC Series VRF 50/60Hz 2.24.6 L5: Zero speed protection There is abnormal noise of Replace the compressor compressor when startup or running Replace the inverter module 2.24.7 L1: Procedure 2.24.8 L2 : Procedure Voltage of power supply is 166-265V? Provide normal power supply Replace outdoor main PCB 2.24.9 Compressor replacement procedure...
  • Page 80 AtomC Series VRF 50/60Hz § The oil should be clear and transparent. Slightly yellow oil is not an indication of any problems. However, if the oil is dark, black or contains impurities, the system has problems and the oil needs to be changed. (If the compressor oil has been spoiled, the compressor will not be being lubricated effectively.
  • Page 81 Ver. 2024-08 Professional Equipment Midea Group Add.: Midea Headquarters Building, 6 Midea Avenue, Shunde, Foshan, Guangdong, China Postal code: 528311 mbt.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 document.

This manual is also suitable for:

Atomc mdvo-atc28v2r1Atomc mdvo-atc36v2r1Atomc mdvo-atc42v2r1Atomc mdvo-atc48v2r1Atomc mdvo-atc56v2r1Atomc mdvo-atc60v2r1

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