Инструкция на Наружные блоки VRF-систем MDV серий V8 Master и V8i Master бренда MDV

R410A

CONTENTS

Part 1 General Information 3 Part 2 Component Layout and Refrigerant Circuits 22 Part 3 Control 40 Part 4 Field Settings 64 Part 5 Electrical Components and Wiring Diagrams 78 Part 6 Diagnosis and Troubleshooting 95 1

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Part 1

General Information 1 Indoor and Outdoor Unit Capacities 2 External Appearance 3 Outdoor Unit Combinations 4 Nomenclature 5 Combination Ratio 15 6 Selection Procedure Part 1 - General Information 17 3

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 code Type code Q1 One-way Cassette T1 High Static Pressure Duct Q2 Two-way Cassette G Wall-mounted Q4C Compact Four-way Cassette DL Ceiling & Floor Q4 Four-way Cassette F…

1.3 Outdoor Units

Table 1-1.6: Outdoor unit capacity range (continued)

2 External Appearance

2.1 Indoor Units 2.1.1 Standard indoor units Table 1-2.1: Standard indoor unit appearance Two-way Cassette C1 C2 Compact Four-way Cassette Four-way Cassette C4C C4 Arc Duct Medium Static Pressure Duct D1 D2 High Static Pressure Duct Floor Standing D3 FS Wall-mounted Ceiling & Floor WM CF Part 1…

2.3 Outdoor Units

Table 1-2.5: V8 appearance(continue)

Table 1-3.1: Outdoor unit combinations of V8 (continued)

System capacity kW HP 196.2 70 202.0 72 207.0 74 213.0 76 218.0 78 224.0 80 229.5 82 235.0 84 240.5 86 246.0 88 252.0 90 258.0 92 263.5 94 269.0 96 274.5 98 280.5 100 280.0 102 292.0 104 297.2 106 303.0 108 308.0 110 314.0 112 319.0 114 325.0 116 330.0 118 336.0 120 No. of units Modules1 ● 36 ● ●● ●…

4 Nomenclature

4.1 Indoor Units 4.1.1 Standard indoor units V8 indoor units MDV I 2 1 ○ ○ 3 18 C1 V ○ ○ ○ ○ D 7 ○ Legend No. Code Remarks 1 MDV MDV 2 I VRF indoor Inverter unit 3 H 4 22 Generatioon 3: Third Generation Capacity index (the capacity in kW multiplied by 10) Indoor unit type C1: One-way Cassette C2…

DC Indoor Units

MD I 2 - 22 Q1 D H N1 ○ ○ ○ ○ ○ ○ ○ ○ Legend No. Code Remarks 1 MD MDV 2 I VRF indoor unit Generation code 3 2 2: The 2nd generation 3: The 3rd generation MDV V8/V8i Master Series Service Manual 4 22 Capacity index (the capacity in kW multiplied by 10) 5 Q1 Indoor unit type Q1: One-way Cassette Q2…

4.1.2 Fresh air processing unit

4.2 Outdoor Units

5 Combination Ratio

Combination ratio = Sum of capacity indexes of the indoor units Capacity index of the outdoor units Table 1-5.1: Indoor and outdoor unit combination ratio limitations Type V8 Series outdoor units V8i Series outdoor units Minimum combination ratio Standard indoor units only Maximum combination ratio…

Table 1-5.3: Combinations of indoor and outdoor units(V8)

6 Selection Procedure

6.1 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…

6.2 Example

The following is a selection example based on total heat load for cooling. Figure 1-6.1: Room plan Room A Room B Room H Room G Room C Room D Room F Room E Step 1: Establish design conditions ▪ Indoor air temperature 25.8°C DB, 18°C WB; outdoor air temperature 33°C DB. ▪ Determine peak load of each…

Table 1-6.2: Extract from medium static pressure duct (T2) cooling capacity table

Table 1-6.5: Extract from Table 1-5.3 Combinations of Indoor and outdoor units

c)

Find the correction factor for piping length and level difference (“K1”) 110 90 0.83 0.84 0.95 70 60 0.97 50 K1=0.943 0.99 40 20 0.85 0.92 80 30 0.86 0.91 100 0.88 0.90 m 0.89 Figure 1-6.3: V8 rate of change in cooling capacity m 0 -10 -40 -60 Part 1 - General Information -50 0.97 -30 0.99 -20 -80…

Part 2

Component Layout and Refrigerant Circuits 1 Layout of Functional Components 23 MDV V8/V8i Master Series Service Manual 2 Piping Diagrams 27 3 Refrigerant Flow Diagrams 22 32

1 Layout of Functional Components

1.1 8-18HP layout of functional components Figure 2-1.1: 8-18HP layout of functional components 16 19 Legend No. 6 Parts name Compressor 2 Oil separator 12 3 High pressure switch 4 Check value 5 Four-way valve(ST1) 6 High pressure sensor 7 Fan 8 Microchannel heat exchanger 9 Electronic expansion…

1.2 20-24HP layout of functional components

Figure 2-1.2: 20-24HP layout of functional components 15 16 Legend No. MDV V8/V8i Master Series Service Manual Compressor 2 Oil separator 3 High pressure switch 4 Check value 5 Four-way valve(ST1) 6 High pressure sensor 7 Fan 8 Microchannel heat exchanger 9 Electronic expansion valve (EEVA) 10 Stop…

1.3 26-36HP layout of functional component

Figure 2-1.3: 26-36HP layout of functional components Legend No. 15-2 15-1 Compressor 2 Oil separator 3 High pressure switch 4 Check value 5 Four-way valve 6 High pressure sensor 7 Fan 8 Microchannel heat exchanger 9 Electronic expansion valve (EEVA) 10 Stop valve (gas side) 11 Stop valve (liquid…

1.4 38-42HP layout of functional component

Figure 2-1.4: 38-42HP layout of functional components Legend No. MDV V8/V8i Master Series Service Manual 7 1 Compressor 2 Oil separator 3 High pressure switch 4 Check value 5 Four-way valve(ST1) 6 High pressure sensor 7 Fan 8 Microchannel heat exchanger 9 Electronic expansion valve (EEVA/EEVB) 10…

2 Piping Diagrams

2.1 8-18HP piping diagram Figure 2-2.1: 8-18HP piping diagram Part 2 - Component Layout and Refrigerant Circuits Legend No. Parts name No. Parts name 1 Compressor 17 Charge port 2 Oil separator 18 Low pressure sensor 3 High pressure switch 19 Gas-liquid separator 4 Check value 20 Muffler 5 Four-way…

2.2 20-24HP piping diagram

MDV V8/V8i Master Series Service Manual Figure 2-2.2: 20-24HP piping diagram Legend No. 28 Parts name No. Parts name 1 Compressor 17 Charge port 2 Oil separator 18 Low pressure sensor 3 High pressure switch 19 Gas-liquid separator 4 Check value 20 Muffler 5 Four-way valve 21 Heat exchanger 6 High…

2.3 26-36HP piping diagram

Figure 2-2.3: 26-36HP piping diagram Part 2 - Component Layout and Refrigerant Circuits Legend No. Parts name No. Parts name 1 Compressor 18 Low pressure sensor 2 Oil separator 19 Gas-liquid separator 3 High pressure switch 20 Muffler 4 Check value 21 Heat exchanger 5 Four-way valve 22 Refrigerant…

2.4 38-42HP piping diagram

MDV V8/V8i Master Series Service Manual Figure 2-2.4: 38-42HP piping diagram Legend No. Parts name Parts name 1 Compressor 18 Low pressure sensor 2 Oil separator 19 Gas-liquid separator 3 High pressure switch 20 Muffler 4 Check value 21 Heat exchanger 5 Four-way valve 6 High pressure sensor Sensor…

2.5 Key components

31 Part 2 - Component Layout and Refrigerant Circuits 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…

Refrigerant Flow Diagrams 3.1 8-18HP 3.1.1 Cooling operation MDV V8/V8i Master Series Service Manual Figure 2-3.1: 8-18HP refrigerant flow during cooling operation 3.1.2 Heating operation Figure 2-3.2: 8-18HP refrigerant flow during heating operation 32

3.1.3 Oil return operation in cooling mode

Figure 2-3.3: 8-18HP refrigerant flow during oil return operation in cooling mode Part 2 - Component Layout and Refrigerant Circuits 3.1.4 Oil return operation in heating mode and defrosting operation (4-way valve change direction) Figure 2-3.4: 8-18HP refrigerant flow during oil return operation in…

3.2 20-24HP

3.2.1 Cooling operation MDV V8/V8i Master Series Service Manual Figure 2-3.5: 20-24HP refrigerant flow during cooling operation 3.2.2 Heating operation Figure 2-3.6: 20-24HP refrigerant flow during heating operation 34

3.2.3 Oil return operation in cooling mode

Figure 2-3.7: 20-24HP refrigerant flow during oil return operation in cooling mode Part 2 - Component Layout and Refrigerant Circuits 3.2.4 Oil return operation in heating mode and defrosting operation (4-way valve change direction) Figure 2-3.8: 20-24HP refrigerant flow during oil return operation…

3.3 26-36HP

3.3.1 Cooling operation MDV V8/V8i Master Series Service Manual Figure 2-3.9: 26-36HP refrigerant flow during cooling operation 3.3.2 Heating operation Figure 2-3.10: 26-36HP refrigerant flow during heating operation 36

3.3.3 Oil return operation in cooling mode

Figure 2-3.11: 26-36HP refrigerant flow during oil return operation in cooling mode Figure 2-3.12: 26-36HP refrigerant flow during oil return operation in heating mode and defrosting operation (4-way valve change direction) 37 Part 2 - Component Layout and Refrigerant Circuits 3.3.4 Oil return…

3.4 38-42HP

3.4.1 Cooling operation MDV V8/V8i Master Series Service Manual Figure 2-3.13: 38-42HP refrigerant flow during cooling operation Note: 42HP is only available for the V8i series. 3.4.2 Heating operation Figure 2-3.14: 38-42HP refrigerant flow during heating operation Note: 42HP is only available for…

3.4.3 Oil return operation in cooling mode

Figure 2-3.15: 38-42HP refrigerant flow during oil return operation in cooling mode 3.4.4 Oil return operation in heating mode and defrosting operation (4-way valve change direction) Figure 2-3.16: 38-42HP refrigerant flow during oil return operation in heating mode and defrosting operation (4-way…

Part 3

Control 1 General Control Scheme Flowchart 41 2 Stop Operation 42 3 Standby Control 43 MDV V8/V8i Master Series Service Manual 4 Startup Control 43 5 Normal Operation Control 6 Protection Control 7 Special Control 56 8 Other Control

1 General Control Scheme Flowchart

Sections 2 to 8 on the following pages detail when each of the controls in the flowchart below is activated. 2 Stop operation ▪ Abnormal shutdown ▪ System stops ▪ A unit stops when the load demanded decreases 3 Standby control ▪ Crankcase heater control 7 Special control Thermo on 4 Normal operation…

2 Stop Operation

The stop operation occurs for one of the three following reasons: 1. Abnormal shutdown: in order to protect the compressors, if an abnormal state occurs，the system will makes a 'stop with thermos-off' operation and an error code will be displayed on the outdoor unit digital displays. 2. The system…

3 Standby Control

3.1 Crankcase Heater Control The crankcase heater is used to prevent refrigerant from mixing with compressor oil when the compressors are stopped. The crankcase heater is controlled mainly according to the minimum of discharge temperatures. When the minimum of discharge temperatures is above 45°C…

4.3 Startup Control for Cooling Operation

Table 3-4.1: Component control during startup in cooling mode Component Wiring diagram label Inverter compressor INV1 A Inverter compressor INV2 B[1] Inverter fan 1 Inverter fan 2[2] MDV V8/V8i Master Series Service Manual Four way ODU valve Electronic expansion valve Solenoid valve IDU Ending…

4.4 Startup Control for Heating Operation

Table 3-4.2: Component control during startup in heating mode Component Wiring diagram label Inverter compressor INV1 A Inverter compressor INV2 B[1] Inverter FANA fan 1 Inverter FANB fan 2[2] Four way ODU valve Electronic expansion valve Solenoid valve ST1 Ending conditions STEP2 STEP3 0Hz STEP5…

5 Normal Operation Control

5.1 Component Control during Normal Operation Table 3-5.1: Outdoor unit component control during normal operation Component Wiring diagram label Inverter compressor A COMP(A) Inverter compressor B[1] COMP(B) Inverter fan 1 FANA Inverter fan 2[2] FANB Cooling Heating PI control, High pressure…

5.2 Compressor Control

Cooling operation Compressor frequency is PI controlled to keep low pressure at target temperature. Te: Low pressure equivalent saturation temperature (°C) Tes: Target Te value. Tes will be decided by Te setting, if you choose Auto that means except Te setting, the Tes would be adjusted according to…

5.3 Rotation of Compressors

In order to make operating time equal for each compressor of combination outdoor units, outdoor units are used in rotation. Figures 3-5.1 to 3-5.2 show the compressor rotation in systems with two and three units. The master unit and slave units 1 and 2 are shown from left to right in that order, and…

5.5 Electronic Expansion Valve Control

5.5.1EEVA/EEVB control The positions of electronic expansion valves EEVA/EEVB are controlled in steps from 0/0 (fully closed) to 480/2880 (fully open). 5.5.1.1 Outdoor unit heat exchanger is performed via the evaporator when outdoor temperature ≥- 8°C： This function is used to exert PI control on…

5.6 Outdoor Fan Control

The speed of the outdoor unit fans is adjusted in steps, as shown in Table 3-5.9 Table 3-5.9: Outdoor fan speed steps Fan speed index MDV V8/V8i Master Series Service Manual 8-18HP 1020 1050 1090 1130 1170 1210 Fan speed (rpm) 20-24HP 26-42HP FANA / FANB FANA / FANB 270(150/150) 300(180/180)…

Table 3-5.10 Upper limit fan step in static pressure mode

Cooling Static Pressure mode HP 0Pa(default) 20Pa 40Pa 60Pa 80Pa 100Pa 120Pa 0Pa(default) 20Pa 40Pa 60Pa 80Pa 100Pa 120Pa Heating Static Pressure mode HP 1. 2. 3. Standard models can provide 20Pa maximum external static pressure. High static pressure models can provide 120Pa maximum external static…

6 Protection Control

6.1 High Pressure Protection Control This control protects the system from abnormally high pressure and protects the compressors from transient spikes in pressure. Figure 3-6.1: High pressure protection control Normal operation Pc ≥ 4.15MPa Pc < 3.5MPa High pressure protection, error code P12 is…

6.4 Over-current Protection Control

Over current protection control is performed to prevent tripping due to transient inverter over-current. It protects the compressors from abnormally high currents. It is performed for each compressor. Figure 3-6.6: Over-current protection control Normal operation Current ≥ CurrentA Current <…

6.5 Ambient temperature out of range protection control

When the outdoor ambient temperature rises above 30.5°C heating mode is disabled to prevent the mechanical load on compressors becoming too high and to prevent low compression ratios which can result in insufficient compressor internal oil lubrication. Figure 3-6.7: Disable heating control Heating…

6.6.2 Error code F63

Figure 3-6.10: Non-inductance resistors temperature protection control Normal operation Tr <70°C Tr ≥95°C Non-inductance resistors temperature protection, error code F63 is displayed Notes: 2. Tr: Non-inductance resistors temperature 6.7 Wet Compression Protection Control This protection is used to…

7 Special Control

7.1 Oil Return Operation In order to prevent compressors from running out of oil, the oil return operation is conducted to recover oil that has flowed out of the compressor(s) and into the piping system. This operation is performed for all units including units that are in standby. When the outdoor…

Cooling indoor unit

FAN Electronic expansion valve (EEV) 500P EEV Thermo ON unit Thermo OFF unit Stop or Fan Thermo ON unit Thermo OFF unit Stop or Fan Keep the previous fan speed Superheat control 80pls 80pls 7.1.2 Heating Oil Return Control It’s basically identical with defrosting operation, refer to 7.2 Defrosting…

7.2 Defrosting Operation

In order to recover heating capacity, the defrosting operation is conducted when the outdoor unit heat exchanger is performing as an evaporator. The defrosting operation is controlled according to outdoor ambient temperature, outdoor heat exchanger temperature, indoor heat exchanger temperature and…

Defrosting control time is no less than 135Sec and fulfill one of the conditions below

▪ Pc-max ≥ 3.0MPa. ▪ Total defrosting control time has reached 9 minutes. ▪ T3_min >Target value for a certain time. Table 3-7.4: Indoor unit component control during defrosting operation Heating indoor unit (ODU operates cooling main operation) Thermo ON unit FAN Thermo OFF unit Stop Thermo ON unit…

8 Other Control

8.1 Overload control Overload control is used to maintain comfort requirement (i.e. outlet air temperature) and keep proper system pressure. Figure 3-8.1: Overload control Normal operation Indoor unit operation ratio ≥ 130% Indoor unit operation ratio <105% Overload control, indoor units operates in…

8.3 Auto Snow-blowing Control

Auto snow-blowing control is used to prevent the fans of stopped outdoor units from destroying by heavy snow. Timing of auto snow-blowing operation: T4≤3°C and outdoor units stops time elapse for TA. Table 3-8.3: Snow-blowing control Model Fan Step TA: Level a (Menu mode n261) TA: Level b (Menu mode…

Silent mode 1

36HP 38HP 40HP MDV V8/V8i Master Series Service Manual 42HP Silent mode 3 Max. frequency step Max. Fan step Max. frequency step Max. Fan step Cooling 31 105+104 30 100+101 28 88+89 Heating 32 110+110 29 100+101 28 Cooling 31 105+104 30 100+101 Heating 32 110+110 29 Cooling 32 110+110 Heating 32…

Silent mode 8

Silent mode 9 Silent mode 10 Silent mode 11 Silent mode 12 Silent mode 13 Silent mode 14 Max. Fan step Max. frequen cy step Max. Fan step Max. frequen cy step Max. Fan step Max. frequen cy step Max. Fan step Max. frequen cy step Max. Fan step Max. frequen cy step Max. Fan step Max. frequen cy step…

Part 4

Field Settings 64 1. Overview 65 2. Digital display and button settings 3. System Parameter Check 75 65

1. Overview

This chapter describes how the system configuration can be implemented once the installation is completed, and other relevant information. It contains the following information: ⚫ Implement field settings ⚫ Using the Check function 2. Digital display and button settings Part 4 - Field Settings 2.1…

2.3 Menu mode

Only master unit has the full menu functions, slave units only have error codes check and cleaning functions. 1. Long press SW5 "MENU" button for 5 seconds to enter menu mode, and the digital display displays "n0". 2. Press SW3 / SW4 "UP / DOWN" button to select the first level menu "n1", "n2"…

Menu mode function

Table 4-2.3 Menu mode function: First level menu n0 (Information query) Second level menu Specified menu mode 0 (History error) 0 Query History error (last ten error codes) 1 Cleaning history error 1 (address) 0 Query Indoor unit's address 2 Query the address of Indoor unit in power-off condition 2…

First level menu

Second level menu 1 (Silent mode) MDV V8/V8i Master Series Service Manual 2 (static pressure) Specified menu mode Description 8 Silent mode 8 9 Silent mode 9 A Silent mode 10 b Silent mode 11 C Silent mode 12 d Silent mode 13 E Silent mode 14 0 0Pa static pressure 1 20Pa static pressure 2 40Pa…

First level menu

Second level menu Description Default 0 0m level difference between indoor unit and outdoor unit 1 20m level difference between indoor unit and outdoor unit 2 40m level difference between indoor unit and outdoor unit 3 60m level difference between indoor unit and outdoor unit 4 80m level difference…

First level menu

Second level menu 0 (target evaporation temperature of the indoor unit) n6 (evaporation and condensation temperature) MDV V8/V8i Master Series Service Manual 2 (target condensation temperature of the indoor unit) n8 7 (Low noise defrosting) 1 (Rotation) n9 nc[1] (Dry contact function) 1 2 Notes…

2.4 Special mode introduction

2.4.1 Priority mode setting Priority mode can only be set on the master unit. When an indoor unit is in mode conflict with the outdoor units the unit displays the mode conflict error. The digital display on indoor main PCB will display error code E0. There are ten priority mode options: 1. Auto…

5. Changeover mode: Before using this mode, you need to set the VIP indoor unit address. The default VIP address is 63, the VIP address also can be changed through menu mode“n1-6”. In changeover mode, if the VIP indoor unit is operating, the outdoor units will operate in the mode of the VIP indoor…

Step1:preparation

Step2:Calculate static pressure of Outdoor unit Step3:Indoor and outdoor temperatures are within the allowable range of test run No Display error code U32/U33/U34 Yes The number of Indoor units is greater than 4 No Turn on all indoor units Yes Part 4 - Field Settings Start the Indoor unit with Yes…

3. System refrigerant quantity detection

After entering this mode, the system will automatically run and finally output the diagnostic results of the system refrigerant quantity. Diagnostic results: a) Normal: Digital display “d34” b) Significantly excessive: Digital display “d32” c) Excessive: Digital display “d33” d) Insufficient…

3. System Parameter Check

3.1 UP / DOWN system check button Before pressing UP or DOWN button, allow the system to operate steadily for more than an hour. On pressing UP or DOWN button, the parameters listed in below table will be displayed in sequence. Table 4-3.1 system check list: DSP1 content Parameters displayed on DSP2…

Table 4-3.1 system check list(continue)

DSP1 content Parameters displayed on DSP2 Remarks 27.-- Discharge superheat degree (°C) Actual value = value displayed 28.-- Primary current(A) Actual value = value displayed /10 29.-- Inverter compressor A current (A) Actual value = value displayed /10 30.-- Inverter compressor A current (A) Actual…

Table 4-3.1 system check list(continue)

DSP1 content 50.-- Parameters displayed on DSP2 Capacity of heating mode IDUs (HP) Remarks Actual value = value displayed(1) 0 :No result 1 :Significantly insufficient 51.-- Refrigerant volume judgment(1) 2 :insufficient 3 :Normal 4 :excessive 5 :Significantly excessive 52.-- Dirty blockage rate…

Part 5

Electrical Components and Wiring Diagrams 78 1. Outdoor Unit Electric Control Box Layout 2. Outdoor Unit Main Control Board 3. Compressor & Fan drive board 85 4. Wiring Diagrams

1. Outdoor Unit Electric Control Box Layout

1.1 8-18HP electric control box Figure 5-1.1: 8-18HP electric control box Part 5 - Electrical Components and Wiring Diagrams 1.2 20-24HP electric control box Figure 5-1.2: 20-24HP electric control box Notes: The differences between electric control box of 20-24HP and 8-18HP are shown in the Figure…

1.3 26-42HP electric control box

MDV V8/V8i Master Series Service Manual Figure 5-1.3: 26-42HP electric control box Notes: 1. The differences between electric control box of 26-42HP and 8-18HP are shown in the Figure 5-1.3. Others are the same as 8-18HP electric control box. 2. The 42HP is only available for V8i series. 80

Outdoor Unit Main Control Board 2.1 Outdoor unit main Control Board ports Figure 5-2.1: Outdoor unit main Control Board ports1 Part 5 - Electrical Components and Wiring Diagrams Notes: Label descriptions are given in Table 5-2.1: Main Control Board port . 81

Table 5-2.1: Main Control Board port

Label in Figure 5-2.1 Port code Content Port voltage 1 CN82 Reserved 5Vdc 2 CN36 Recirculation fan control port 3.3Vdc 3 CN70 EEVA drive port 12Vdc 4 CN71 EEVB drive port(Reserved) 12Vdc 5 CN72 EEVC drive port 12Vdc 6 CN73 EEVE drive port 12Vdc Microchannel heat exchanger inlet temperature…

2.2 Outdoor unit main Control Board components

2.2.1 Layout Figure 5-2.2: Outdoor unit main Control Board components Part 5 - Electrical Components and Wiring Diagrams 2.2.2 Function of buttons SW3 to SW6 Table 5-2.2: Function of buttons SW3 to SW6 Button SW3 (UP) SW4 (DOWN) SW5 (MENU) SW6 (OK) Function In menu mode: previous and next buttons…

Digital display output Table 5-2.4: Digital display output in different operating states Outdoor unit state Parameters displayed on DSP1 Parameters displayed on DSP2 The number of indoor units in Standby The address of outdoor unit communication with the outdoor DSP1 units Normal MDV V8/V8i Master…

3.2 Compressor & Fan drive board of 75A

MDV V8/V8i Master Series Service Manual Figure 5-3.1: Compressor & Fan drive board of 75A 86

3.3 Compressor & Fan drive board of 50A

Figure 5-3.2: Compressor & Fan drive board of 50A Part 5 - Electrical Components and Wiring Diagrams 87

3.4 Compressor & Fan drive board of 35A

MDV V8/V8i Master Series Service Manual Figure 5-3.3: Compressor & Fan drive board of 35A 88

3.5 Compressor & Fan drive board ports

Figure 5-3.4: Compressor & Fan drive board ports of 50A Part 5 - Electrical Components and Wiring Diagrams Table 5-3.2: Compressor & Fan drive board port Label in Port Feature Figure 5-2.5 code identifier 1 CN1 P-in 2 CN5 P-out 3 CN16 L1 Three phase power input of L1 phase 4 CN7 L2 Three phase power…

Label in

Port Feature Figure 5-2.5 code identifier 6 CN38 - 7 CN26 - 8 CN3 DCFAN CN8/C MDV V8/V8i Master Series Service Manual 9 N9 O-Motor Content Port voltage Power supply terminal for DC fan drive board (P,N) 438Vdc~650Vdc(Rated 540Vdc; (Reserved） P is positive, N is negative) Fan module controls power…

3.6 Compressor & Fan drive board ports

Figure 5-3.5: Fan drive board Part 5 - Electrical Components and Wiring Diagrams Table 5-3.4: Compressor & Fan drive board port Label in Figure 5-2.5 Port code Content Port voltage 1 CN6 Fan module controls power supply(Reserved） 19V 2 CN2 EEPROM Program burning port 5V 3 CN4\CN1 4 CN7 5 CN3 Output…

3.7 The installation guide of Compressor & Fan drive board

MDV V8/V8i Master Series Service Manual Figure 5-2.6: The installation guide of Compressor & Fan drive board 92

1. Before maintaining or repairing the outdoor unit, cut off the power supply of the outdoor unit for 5 minutes and use a mustimeter to ensure that the voltage is zero to avoid electric shock. Notice The unit has the low-power standby function. After entering this mode, only the power indicator of…

4. Wiring Diagrams

MDV V8/V8i Master Series Service Manual Figure 5-3.1: V8 outdoor unit wiring diagram 94

Part 6

Diagnosis and Troubleshooting 1 Error Code Table 96 3 Error in Compressor Driver 4 Error in Fan Drive Part 6 - Diagnosis and Troubleshooting 2 Error in Main Control Appendix 197 95

1 Error Code Table

1.1 Outdoor Error code table MDV V8/V8i Master Series Service Manual Table 6-1.1 Outdoor Error code table Error description A01 Emergency shutdown AAx No.x Inverter driver board does not match the main control board xA61 No.x slave unit error Salve unit’s fault NO xb53 No.x Heat dissipation fan…

Manual re-start

Error code Error description Remarks F81 Gas pipe temperature sensor (Tg) error (open/short) sensor error NO F91 Liquid pipe temperature sensor (T5) error (open/short) sensor error NO FA1 Outdoor Heat exchanger gas temperature sensor (T8) error (open/short) sensor error NO FC1 Outdoor heat exchanger…

Manual re-start

Error code Error description Remarks P71 EEPROM error E party error Pb1 HyperLink overcurrent error Pd1 Anti-condensation protection condensation NO Pd2 Pd1 protection occurs 2 times in 60 minutes condensation YES 1b01 Electronic expansion valve (EEVA) error 2b01 Electronic expansion valve (EEVB)…

1.3 Compressor drive error code table

Table 6-1.3 Compressor drive error code table Error code Error description xL1E Hardware overcurrent Remarks Manual re-start required2 NO current overload xL11 Software overcurrent xL12 Software overcurrent protection last 30s xL2E Module overtemperature protection xL3E Low bus voltage error xL31…

1.5 Status prompt code table

Table 6-1.5 Status prompt code table Code description Remarks d0x Oil return,”x” is the current step node Status hint NO dfx Defrost, ”x” is the current step node Status hint NO Status hint NO Status hint NO Status hint NO Status hint NO d11 d12 d13 d14 MDV V8/V8i Master Series Service Manual Manual…

2 Error in Main Control

2.1 A01: emergency shutdown of Outdoor Units Digital display output Description ▪ Compressor protection shut down ▪ All Outdoor Units stop running ▪ Error codes are displayed only on master uint. Part 6 - Diagnosis and Troubleshooting Trigger / recover condition (1)Check menu N28 = 0: ▪ Trigger…

A01

Menu option NC0=3 or NC1=3? No Yes Menu option N28=0? No MDV V8/V8i Master Series Service Manual Yes CN55/CN56 short circuit CN55/CN56 open circuit Rule out short circuit condition Rule out open circuit condition Automatic recovery after 5s? Yes troubleshooting 102 NO Error in the main control board…

Digital display output Description ▪ xA6 shows The Outdoor Unit at address X is in error(x=1,2,3) ▪ All Outdoor Units stop running ▪ Error code are displayed only on master unit. ▪ ▪ ▪ Part 6 - Diagnosis and Troubleshooting ▪ Trigger / recover condition Trigger condition: Slave machine is in error.…

2.3 AAx: Inverter driver board X does not match the main control board

Digital display output Description ▪ No.x Inverter driver board does not match the main control board ▪ All units stop running. ▪ Error code is displayed on the unit with the error MDV V8/V8i Master Series Service Manual Trigger / recover condition ▪ Trigger condition:the internal driver parameters…

Digital display output Description ▪ No.x Recirculation Fan[1] is in error ▪ All units stop running. ▪ Error code is displayed on the unit with the error Trigger / recover condition ▪ Trigger condition: the difference between the actual fan speed and the set fan speed is 300rpm, lasting for 50s. ▪…

xb53

Check whether the wiring is correct[2] No rewring Yes No Two Recirculation Fan system No The original faulty fan is normal MDV V8/V8i Master Series Service Manual Yes Check whether the faulty fan works properly after the cables are exchanged with the normal fan No Yes Replace the power supply board…

2.5 bA1: HyperLink cannot open or close IDU’s Electronic expansion valve

Digital display output Description ▪ When some IDUs are powered off, HyperLink fail to close their EEV. ▪ All units stop running. ▪ Error code is only displayed on the master unit Part 6 - Diagnosis and Troubleshooting Trigger / recover condition ▪ Trigger condition:when some IDUs in the system are…

bA1

HyperLink Diameter of communication line＜1.5mm2 Replace the communication cable with the diameter specified in the installation manual Yes No MDV V8/V8i Master Series Service Manual The total length of HyperLink communication cables exceeds 200 meters without a repeater Yes Add a repeater at the…

2.6 U38: Outdoor Unit has no address

Digital display output Description ▪ Outdoor Unit has no address. ▪ The ODU with error can not run. ▪ The master outdoor unit cannot communicate with indoor units. Trigger / recover condition ▪ Trigger condition: The ODU’s address is not set ▪ Recover condition: Enter the menu N40 to reset the…

2.7 C13: The address of Outdoor Unit is repeated

Digital display output Description ▪ The address of Outdoor Unit is repeated. MDV V8/V8i Master Series Service Manual Trigger /recover condition ▪ Trigger:Two or more outdoor units in the Combined system have the same address ▪ Recover condition:the address of master and slave unit are set to be 0~3…

2.8 C21: Communication error between IDU and ODU

Digital display output Description ▪ Communication error between IDU and ODU ▪ All units stop running. ▪ Error code is only displayed on the master unit. Trigger / recover condition ▪ Trigger condition:20 minutes after the outdoor unit is power on,the communication signal from the IDU cannot be…

C21

No The IDUs and ODU use the same communication port Power on again, and error disappear Reconnect the communication lines Yes No Yes No Use the three-core shield cable (More than 0.75 mm2 )[1] and the cable is intact Replace communication cable Troubleshooting Yes Yes Use PQE communication port and…

2.9 C26 Abnormal reduction in the number of indoor units

Digital display output Description ▪ The number of online indoor units is smaller than the configured number ▪ All units stop running. ▪ Error code is only displayed on the master unit ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ Part 6 - Diagnosis and Troubleshooting Trigger / recover condition ▪ Trigger condition: N0: The…

C26

Power on the IDUs again and check "Number of online units" after 6 minutes of standby[1] Check whether the number of online IDUs is consistent with the setting number No There are IDUs not powered on in the system Yes Check the power cord of the IDUs, and set the address for the IDU by controller…

2.10 C28: Abnormal increase in the number of indoor units

Digital display output Description ▪ Abnormal increase in the number of indoor units ▪ All units stop running. ▪ Error code is only displayed on the master unit ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ Part 6 - Diagnosis and Troubleshooting Trigger / recover condition ▪ Trigger condition: N0: The number of IDU set by ODU…

C28

Power on the ODU again and check "Number of online units" after 6 minutes of standby[1] Remove IDUs of other systems Yes whether the number of online IDU is consistent with the actual number of connected IDU No Check whether other IDUs are connected to this system MDV V8/V8i Master Series Service…

2.11 xC31: Communication error between No.x slave outdoor unit and master outduoor unit

Digital display output Description ▪ The No.x outdoor slave unit cannot communicate with the outdoor master unit. ▪ All units stop running. ▪ Error code is only displayed on the slave unit with the error. ▪ ▪ ▪ ▪ Possible causes Communication cables are not tightened on the wiring block The surface…

C31

Check whether the address of the ODU is correct[1] NO Enter the menu N40 to reset the outdoor unit address[1] YES NO Check whether the communication cable between ODUs are correct and secure YES MDV V8/V8i Master Series Service Manual Dismantle the H1/H2/E communication line Check whether the DC…

2.12 C32: Abnormal reduction in the number of outdoor units

Digital display output ▪ ▪ ▪ ▪ ▪ ▪ Possible causes Some outdoor slave units are powered off The outdoor units’ address are repeated The outdoor unit address is false. Outdoor main control board is damaged The H1/H2 cable sequence is incorrect Outdoor Units do not support Combined connection Part 6…

C32

Check whether the OSUs support parallel system Different series or independent units can not be mixed use, reinstall No Yes Check whether the power supply of ODU is normal Make sure all outdoor units are connected to correct power suppliess No Yes MDV V8/V8i Master Series Service Manual Check…

2.13 C33: Abnormal increase in the number of outdoor units

Digital display output ▪ ▪ ▪ ▪ ▪ ▪ Description The number of online outdoor slave units detected by the outdoor master unit increases All units stop running. Error code is only displayed on the master unit Trigger / recover condition Trigger condition:One or more slave Outdoor unit is newly…

2.14 xC41: Communication Error between main control board and No.x inverter driver board

Digital display output MDV V8/V8i Master Series Service Manual Description ▪ The communication between the main control board and No.x inverter driver board is error ▪ All units stop running. ▪ Error code is displayed on the unit with the error Trigger / recover condition ▪ Trigger condition…

Digital display output Error code E41 Error description Outdoor ambient temperature sensor (T4) error(open/short) Remarks Digital display output sensor error Microchannel heat exchanger outlet F31 temperature sensor(T6B) sensor error error(open/short) F41 Main heat exchanger pipe temperature sensor…

Description

▪ All units stop running. ▪ Error code is displayed on the unit with the error Trigger / recover condition ▪ Trigger condition:The main control board cannot obtain the normal AD value of the temperature sensor ▪ Recover condition:The main control board obtain the normal AD value of the temperature…

2.16 F62, F6A: Inverter driver board NTC overtemperature protection

Digital display output Description ▪ All units stop running ▪ Error code is displayed on the unit with the error. Part 6 - Diagnosis and Troubleshooting Trigger/ Recover condition ▪ Trigger condition: F62: The NTC temperature inside the compressor board or fan module is higher than 100 ° C F6A: F62…

F62，F6A

Screws on the module board are not secured YES Refastening screw[1] NO Power on again, troubleshooting？ YES NO Check whether the thermal grease layer is missing[2] YES Brush a layer of thermal grease evenly[2], and tighten the screws again after installation[1] Power on again, troubleshooting？ YES…

2.17 F63: Non-inductive resistance Tr overtemperature protection

Digital display output Description ▪ All units stop running ▪ Error code is displayed on the outdoor unit with the Error Trigger/ Recover condition ▪ Trigger condition: The non-inductive resistance temperature exceeds 95 ° C ▪ Recover condition: The non-inductive resistance temperature is lower than…

F63

Top Flow Series The Recirculation Fan in the electric control box works improperly YES NO YES NO The air intake grille at the bottom of the machine or the internal air duct is blocked NO removal of fault refer to the procedure of xb53 MDV V8/V8i Master Series Service Manual YES Clean up Power on…

Digital display output Description ▪ Discharge Temperature is over the limit. ▪ All outdoor Unit stop running ▪ Error code is displayed on the unit with the error Part 6 - Diagnosis and Troubleshooting Trigger / Recover condition ▪ Trigger condition: F72: Discharge Temperature (T7C1/T7C2) ≥ 115oC.…

Procdure

F72/F7A .Discharge temperature sensors' connections on main control board are loose[1] Yes Reconnect the sensor to the Main control board No No Error disappear Yes Troubleshooting Yes The temperature sensor is abnormal[2] Replace the temperature sensor MDV V8/V8i Master Series Service Manual No…

2.19 F75: Compressor discharge insufficient superheat protection

Digital display output ▪ ▪ ▪ ▪ Description Superheat degree of Compressor discharge temperature is too low, triggering protection shutdown Determination during operation of outdoor unit. All units stop running. The error code is displayed on the outdoor unit with error. ▪ ▪ ▪ ▪ ▪ ▪ Possible causes…

F75

The Discharge temperature sensor is not properly connected [1] Yes Ensure that the Discharge temperature sensor is properly connected and located at the top of the compressor No Yes Discharge temperature sensor failure [2] Replace the sensor No Yes Replacing the high pressure Sensor MDV V8/V8i…

2.20 P11: High pressure sensor error

Digital display output Description ▪ Open/short circuit error of high pressure sensor ▪ All units stop running. ▪ The error code is displayed on the Outdoor Unit with error. Trigger / recover condition ▪ Trigger condition:The main control board cannot obtain the normal AD value of the high pressure…

2.21 P12/P14:High pressure protection

Digital display output MDV V8/V8i Master Series Service Manual ▪ ▪ ▪ ▪ Description P12: The high pressure is over the limit. P14: 3 times P12 in 100 minutes All units stop running Error code is displayed on the unit with the Error Trigger / recover condition ▪ Trigger condition: • P12: discharge…

P12

The stop valves are close YES Open the stop valves No 1. Connect pressure gauge to test Discharge pressure 2. Power on and run again, and check the low pressure value YES Part 6 - Diagnosis and Troubleshooting Check whether the pressure sensor is normal[1] Discharge part of the refrigerant. Add oil…

2.22 P13: High pressure switch protection

Digital display output Description ▪ All units stop running ▪ Error code is displayed on the unit with the Error MDV V8/V8i Master Series Service Manual Trigger / recover condition ▪ Trigger condition: discharge pressure≥ 4.2MPa. ▪ Recover condition:discharge pressure< 3.0 ▪ Reset method: Resume…

P13

Ensure th e following 3 points: 1. Th e stop valve has been opened 2. Th e pressure switch is properly connected to the compressor module board 3. Th e pressure switch is in no rmal conduction state No Th e 3 points above is normal Correct and reconfirm YES Operating system and measure the high…

2.23 P21: Low pressure sensor error

Digital display output Description ▪ Open/short circuit Error in suction pressure sensor ▪ All units stop running. ▪ Error code is only displayed on the slave unit with the error. MDV V8/V8i Master Series Service Manual Trigger / recover condition ▪ Trigger condition:Abnormal values of the…

P21

Check whether the sensor is properly and securely connected to the mainboard No Reconnect Sensor according to the wiring diagram Yes 1.Use pressure gauge to measure the low pressure 2. Use multimeter to measure the pressure sensor output voltage No Replace the pressure sensor Part 6 - Diagnosis and…

2.24 P22, P25: Low pressure protection

Digital display output MDV V8/V8i Master Series Service Manual Description ▪ All units stop running. ▪ Error code is displayed on the unit with the error. Trigger/ Recover condition ▪ Trigger condition: • P22: suction pressure < 0.07MPa. • P25: P22 occurs 3 times within 60 minutes ▪ Recover…

P22/P25

Ensure th e following 2 points: 1. Th e stop valve has been opened 2. Th e Low pressure sensor is properly connected to the compressor module board No Th e 2 points above is normal Correct and reconfirm YES Operating system and measure the low pressure by pressure gauge No Part 6 - Diagnosis and…

2.25 P24: Abnormal elevation of low pressure

Digital display output MDV V8/V8i Master Series Service Manual Description ▪ All units stop running. ▪ Error code is displayed on the unit with the error Trigger/ Recover condition ▪ Trigger condition: Suction pressure >1.6MPa and lasts 60 minutes ▪ Recover condition: The ODU shutdown and resume…

Digital display output Description ▪ The DC bus current of No.x compressor is too high, triggering protection shutdown ▪ All units stop running.. ▪ Error code is displayed on the unit with the error. ▪ ▪ ▪ ▪ Part 6 - Diagnosis and Troubleshooting Trigger / recover condition ▪ Trigger condition: P32…

XP32，XP33

ODU stop valve is closed? Yes Open ODU stop valve No Yes compressor cable is damaged Replacing the compressor Cable No Yes The resistance of the compressor wiring terminals to the ground is less than 1 MΩ The compressor is damaged. Replace the compressor No MDV V8/V8i Master Series Service Manual…

2.27 P51: High AC voltage protection

Digital display output Description ▪ The AC voltage of the system is too high, triggering the protection shutdown ▪ All units stop running ▪ Error code is displayed on the unit with the error. Trigger / recover condition ▪ Trigger condition:The AC voltage of Outdoor Unit over 265 V ▪ Recover…

2.28 P52: Low voltage protection

Digital display output Description ▪ The AC voltage of the system is too low, triggering the protection shutdown ▪ All units stop running. ▪ Error code is displayed on the unit with the error MDV V8/V8i Master Series Service Manual Trigger / recover condition ▪ Trigger condition:The Vac of Outdoor…

P52

Check the power input: 1. Whether the input voltage is within the allowed range (±10%) 2. Whether the input power supply is phase missing or wiring error 3. Whether the three-phase input voltage imbalance is less than 12V Yes Whether the power input is abnormal Repairing the input power supply No…

2.29 P53: Phase B and N of the power cable are connected to the opposite protection

Digital display output MDV V8/V8i Master Series Service Manual Description ▪ System zero line, phase line reverse connection ▪ All units stop running ▪ Error code is displayed on the unit with the error Trigger / recover condition ▪ Trigger condition: Phase B is connected to the zero line in reverse…

P53

Yes Whether there is any abnormality in the input voltage of the power supply of the inverter drive board [1] Replace inverter control board No Yes Ensure proper wiring No Whether the power supply is normal?(BN is reversed or B phase voltage is seriously too low) Yes Ensure the power supply is…

2.30 P54: DC bus low voltage protection

Digital display output Description ▪ The DC bus voltage of the compressor is too low ▪ All units stop running. ▪ Error code is displayed on the unit with the error MDV V8/V8i Master Series Service Manual Trigger / recover condition ▪ Trigger condition: The DC bus voltage of the Outdoor Unit is lower…

2.31 P55: Dc bus ripple over protection

Digital display output Description ▪ The ripple of the dc bus on the module is over the limits. ▪ All units stop running. ▪ Error code is displayed on the unit with the error Trigger / recover condition ▪ Trigger condition: Power input is out of phase or the three-phase power supply is seriously…

P55

Yes Standby check whether the threephase input power supply of the inverter drive board is missing phase or wrong phase Rectify the power supply No Yes MDV V8/V8i Master Series Service Manual Standby measure whether L1L2 relay output is missing phase Main relay of inverter drive board L1L2 is not…

Digital display output Description ▪ No.x inverter driver board DC bus voltage is too low ▪ All units stop running.. ▪ Error code is displayed on the unit with the error Trigger / recover condition ▪ Trigger condition: The inverter driver board upload L3E/J3E fails ▪ Recover condition: The inverter…

Digital display output Description ▪ No.x inverter driver board DC bus voltage is too high ▪ All units stop running.. ▪ Error code is displayed on the unit with the error MDV V8/V8i Master Series Service Manual Trigger / recover condition ▪ Trigger condition: The inverter driver board upload L31/J31…

2.34 xP58: No.x inverter driver board DC bus voltage is seriously too high

Digital display output Description ▪ No.x inverter driver board DC bus voltage is seriously too high ▪ All units stop running.. ▪ The error is displayed separately on each Outdoor Unit. Trigger / recover condition ▪ Trigger condition: The inverter driver board upload L32/J32 fails ▪ Recover…

Digital display output Description ▪ The EEPROM parameter of the ODU main control board is incorrect ▪ All units stop running. ▪ Error code is displayed on the unit with the error MDV V8/V8i Master Series Service Manual Trigger / recover condition ▪ Trigger condition:EEPROM parameter verification is…

2.36 Pb1: HyperLink overcurrent error

Digital display output Description ▪ HyperLink overcurrent error ▪ All units stop running. ▪ Error code is displayed on master ODU. Trigger / recover condition ▪ Trigger condition: No IDU is in power down mode and the feedback voltage of the HyperLink board is > 1.5V for 120ms. ▪ Recover condition…

Pb1

Yes The ODU mainboard continues to restart, and the LED3 on the right side of HyperLink board lights up Remove the ODU M1M2 communication cable and measure whether there is a short circuit between the two communication cables No Measure whether there is a short circuit between the M1M2 ports start…

2.37 Pd1, Pd2: Anti-condensation protection

Digital display output Description ▪ Anti-condensation protection ▪ All units stop running. ▪ Error code is displayed on the unit with the error ▪ ▪ ▪ ▪ ▪ Possible causes Temperature sensors T6A, T6B, and T5 are not installed in the correct positions Temperature sensor T6A, T6B, and T5 are damaged…

Pd1

Turn off the power supply, open the electrical control box to check the condensation of the radiator, and dry all water droplets on the radiator and inverter driver board. T5, T6A, and T6B sensors are installed in correct positions No Correct sensor position Yes No The resistance of T5, T6A, T6B…

2.38 xb01: The electronic expansion valve is in error

Digital display output Description ▪ No.x electronic expansion valve’s connection on main control board is missing(1 to 4 correspond to expansion valves A, B, C, and E respectively) ▪ All units stop running Electronic ▪ Error code is displayed on the outdoor unit with error. Possible causes ▪…

xb01

No.x electronic expansion valve s connection on main control board is missing or loose[1] YES Ensure the connection is correct and firm. No Electronic expansion valve coil has malfunction [2] NO main control board is damaged MDV V8/V8i Master Series Service Manual YES Replace the main control board…

2.39 U11: Outdoor unit model is not set

Digital display output Description ▪ All units stop running ▪ Error code is displayed on the unit with the error Trigger / recover condition ▪ Trigger condition: The model information is not set. ▪ Recover condition: The model information of the unit is set correctly ▪ Reset method: Resume manually…

2.40 U12: Outdoor unit Capacity setting error

Digital display output Description ▪ The capability information of outdoor unit is not set ▪ All units stop running ▪ Error code is displayed on the unit with the Error MDV V8/V8i Master Series Service Manual Trigger / recover condition ▪ Trigger condition: The capability information of outdoor unit…

2.41 U21: The indoor unit connection is incorrect

Digital display output Description ▪ The indoor unit connection is incorrect ▪ All Outdoor units stop running ▪ Error is only displayed in main control board Error code The system checks the connected Indoor Unit type U21 The system is connected to the old Indoor Unit ▪ Recover condition: Correct…

2.42 U31: The test run was never successful

Digital display output Description ▪ The test run was unsuccessful ▪ All units stop running ▪ Error code is only displayed on the master unit. MDV V8/V8i Master Series Service Manual Trigger / Recover condition ▪ Trigger condition: The test run was unsuccessful ▪ Recover condition: The test run…

2.43 U32, U33, U34: The temperature is not suitable for test run

Digital display output Description ▪ Ambient temperature is out the allowed range of test run ▪ All units stop running ▪ Error code is only displayed on Outdoor Unit Trigger /Recover condition ▪ Trigger condition: After entering into test run, the master unit estimates whether it is suitable for…

U32\U33\U34

Check whether the ambient temperature is within the allowed range of test operation Yes Power it on again and Rest runt in 30 minutes MDV V8/V8i Master Series Service Manual Troubleshooting 168 No Termination of test run

Digital display output Description ▪ Stop valve is not open ▪ All units stop running ▪ Error code is only displayed on the master unit. Trigger/ Recover condition ▪ Trigger condition: Error code U37 The liquid side stop valve of the discharge pressure of system is not opened heating mode≥ 3.9MPa The…

Description

▪ There are indoor unit in the communication system outside the refrigerant system. ▪ All units stop running ▪ Error code only displayed on the master unit. MDV V8/V8i Master Series Service Manual Trigger / Recover condition ▪ Trigger condition: There are indoor unit in the communication system…

Description

▪ During the test run, abnormal changes in ambient temperature are detected and the operation is stopped. ▪ All units stop running ▪ Error code only displayed on the master unit. Trigger / Recover condition ▪ Trigger condition: ①Cooling mode: the return air temperature is detected to increase more…

U3b

Check whether the ventilation and heat dissipation are good and meet installation requirements Reinstall according to the INSTALLATION AND OWNER S MANUAL No Yes Check whether return air of the ODU is affected by other heat sources or ODUs Remove other ODUs or heat sources, or transfer the machine to…

Description

▪ The ODU in changeover mode doesn’t detect the signal of VIP IDU. ▪ ODUs stop running ▪ Error code only displayed on the master unit. Trigger / Recover condition ▪ Trigger condition: ①The ODU in changeover mode , but the VIP address has not been set. ②The ODU in changeover mode doesn’t detect the…

Description

▪ Protection Overconnection ratio ▪ All units stop running Trigger / Recover condition ▪ Trigger condition: 1) Code of Indoor Unit and type analysis Code of Indoor Unit Indoor Unit A Indoor Unit B Indoor Unit C Indoor Unit D Type of Indoor Unit VRF Air-cooled indoor Fresh Air Processing AHU KIT(Air…

Indoor/Outdoor Unit connection rate out of allowable range

Procedure U4x Check the indoor unit connection and remove the indoor unit beyond the permitted range Power on and check again Part 6 - Diagnosis and Troubleshooting Troubleshooting 175

2.49 U51: Outdoor unit of Individual Series is installed in combine system

Digital display output MDV V8/V8i Master Series Service Manual Description ▪ Outdoor unit of Individual Series is installed in combine system ▪ All units stop running ▪ Error code is only displayed on master unit. Trigger / Recover condition ▪ Trigger condition: Outdoor unit of Individual Series is…

2.50 U53: Detected different series outdoor units in the same VRF system

Digital display output Description ▪ Detected different series outdoor units in the same VRF system ▪ All units stop running ▪ Error code is only displayed master unit Part 6 - Diagnosis and Troubleshooting Trigger / Recover condition ▪ Trigger condition: Detected different series outdoor units in…

3 Error in Compressor Driver

3.1 xL1E: Hardware overcurrent Digital display output MDV V8/V8i Master Series Service Manual Description ▪ The current exceeds the OCP protection value (peak value) set by the hardware or the IPM module receives an FO signal ▪ The compressor stops running after the error occurs. If the error…

xL1E

Yes Replace the inverter driver board Failure during standby No Yes Compressor windings short-circuit between phases Replace the compressor No Yes Yes Part 6 - Diagnosis and Troubleshooting Replace inverter diver board , and the error code disappear Troubleshooting No abnormal sound or shaking in…

Digital display output MDV V8/V8i Master Series Service Manual Description ▪ The current exceeds the OCP protection value set by the software. ▪ The compressor will shutdowm when the error occurs. If the error disappears one minute later, the compressor will start again. Trigger / recover condition…

3.3 xL2E: Module overtemperature protection

Digital display output Description ▪ The temperature of the IPM exceeds 105° C. ▪ The compressor will stop when the error occurs. If the error disappears one minute later, the compressor will start again Trigger / recover condition ▪ Trigger condition:The temperature of the IPM exceeds 105° C ▪…

3.4 xL3E: The bus voltage is too low

Digital display output ▪ ▪ MDV V8/V8i Master Series Service Manual ▪ ▪ ▪ ▪ ▪ ▪ Description Bus voltage is lower than the low bus voltage protection threshold set by the software (350VDC). The compressor stops running after the error occurs. If the error disappears one minute later, the compressor…

3.5 xL31: The bus voltage is too high

Digital display output Description ▪ Bus voltage is higher than the high bus voltage protection threshold set by the software (800VDC). ▪ The compressor stops running after the error occurs. If the error disappears one minute later, the compressor starts again. Trigger / recover condition ▪ Trigger…

3.6 xL32: The bus voltage is excessively high

Digital display output MDV V8/V8i Master Series Service Manual Description ▪ Bus voltage is higher than the high bus voltage protection threshold set by the software (820VDC). ▪ The compressor stops running after the error occurs. If the error disappears one minute later, the compressor starts…

3.7 xL43: The current sampling bias is abnormal

Digital display output Description ▪ Bias calibration of the current sampling circuit is in error.ias calibration of the current sampling circuit is in error. ▪ After this error occurs, the compressor cannot start. Check whether the inverter driver board is in error. Trigger / recover condition ▪…

Digital display output Description ▪ The compressor fails to start ▪ The compressor stops running after the error occurs. If the error disappears one minute later, the compressor starts again. MDV V8/V8i Master Series Service Manual Trigger / recover condition ▪ Trigger condition:The compressor…

3.9 xL52: Locked-rotor protection

Digital display output Description ▪ The compressor is blocked. ▪ The compressor stops running after the error occurs. If the error disappears one minute later, the compressor starts again. Trigger / recover condition ▪ Trigger condition:The compressor is blocked. ▪ Recover condition:The blocking…

4 Error in Fan Drive

4.1 xJ1E: Hardware overcurrent Digital display output MDV V8/V8i Master Series Service Manual Description ▪ The current exceeds the OCP protection value (peak value) set by the hardware or the IPM module receives an FO signal ▪ The fan stops running after the error occurs. If the error disappears…

Digital display output Description ▪ The current exceeds the OCP protection value set by the software. ▪ The fan will stop when the error occurs. If the error disappears five seconds later, the fan will start again. Possible causes ▪ Severe fan wear. ▪ The software out of control leads to fan…

4.3 xJ2E: Module overtemperature protection

Digital display output Description ▪ The temperature of the IPM exceeds 105°. ▪ The fan stops running after the error. If the error disappears after five seconds, the fan starts again. MDV V8/V8i Master Series Service Manual Trigger / recover condition ▪ Trigger condition:The temperature of the IPM…

4.4 xJ3E: The bus voltage is too low

Digital display output Part 6 - Diagnosis and Troubleshooting Description ▪ Bus voltage is lower than the low bus voltage protection threshold set by the software (350VDC). ▪ The fan stops running after the error occurs. If the error disappears five seconds later, the fan starts again. Trigger /…

4.5 xJ31: The bus voltage is too high

Digital display output Description ▪ Bus voltage is higher than the high bus voltage protection threshold set by the software (800VDC). ▪ The fan stops running after the error occurs. If the error disappears five seconds later, the fan starts again. MDV V8/V8i Master Series Service Manual Trigger /…

4.6 xJ32: The bus voltage is excessively high

Digital display output Description ▪ Bus voltage is higher than the high bus voltage protection threshold set by the software (820VDC). ▪ The fan stops running after the error occurs. If the error disappears five seconds later, the fan starts again. Trigger / recover condition ▪ Trigger condition…

Digital display output Description ▪ The fan fails to be started. ▪ The fan stops running after the error. If the error disappears after five seconds, the fan starts again. MDV V8/V8i Master Series Service Manual Trigger / recover condition ▪ Trigger condition: Fan startup failure. ▪ Recover…

4.9 xJ52: Locked-rotor protection

Digital display output Description ▪ The fan is blocked. ▪ The fan stops running after the error. If the error disappears after five seconds, the fan starts again. Trigger / recover condition ▪ Trigger condition: The fan is blocked. ▪ Recover condition: The blocking error is removed. ▪ Reset method…

Digital display output Description ▪ The fan has phase loss protection. ▪ The fan stops running after the error. If the error disappears after five seconds, the fan starts again. MDV V8/V8i Master Series Service Manual Trigger / recover condition ▪ Trigger condition:The fan cable is not connected or…

5 Appendix

5.1 Resistance characteristics of temperature sensor Table 6-5.1: Temperature probe symbol and position Temperature probe symbol and position The probe type Bottom of heat exchanger Type A T4 Outdoor ambient temperature Type A T5 Liquid pipe stop valve Type A T6A Microchannel heat exchanger inlet…

temperature

resistance (kΩ) Type A Type B Type C 44 4.387 24.85 24.85 45 4.213 23.89 23.9 46 4.046 22.89 22.98 47 3.887 22.1 22.1 48 3.735 21.26 21.26 49 3.59 20.46 20.47 50 3.451 19.69 19.7 51 3.318 18.96 18.97 52 3.192 18.26 18.26 53 3.071 17.58 17.59 54 2.959 16.94 16.94 55 2.844 16.32 16.32 56 2.738 15.73…

таблицы и схемы — в просмотре

temperature

resistance (kΩ) (°C) Type A 130 0.2777 131 0.2708 132 0.2641 133 0.2576 134 0.2513 135 0.2451 Type B Type C 1.632 Part 6 - Diagnosis and Troubleshooting 201

5.2 Normal status parameter of refrigerant system

The parameters listed in Tables 5.2.1 and 5.2.2 need to be noted when the following conditions are met:: ▪ The master can detect all indoor machines: ▪ The number of indoor units displayed for outdoor units is consistent with the actual installation. ▪ All stop valves have been opened and all indoor…

5.3 Analysis of the cause of system anomalies

Cause Analysis of Excessive discharge Temperature failure of SV7 coil failure of SV7 body Control failure of SV7 Control failure of mainboard failure of EEVC coil failure of EEVC Control failure of EEVC Control failure of Discharge temperature failure of T6A or T6B Control failure of ODU The…

Cause Analysis of too high Pressure

Stop valve is closed The resistance of the high-pressure side pipe is too large Piping is bent or severely deformed The pipe is blocked. *Cooling mode Control failure of EEV coil Control failure of ODU EEV Check whether coil is normal Failure of High pressure sensor whether sensor is not properly…

Cause Analysis of too Low Pressure

*cooling mode Control failure of suction pressure Mainboard is damaged Failure of low pressure sensor Control failure of low pressure protection Control failure of IDU Mainboard is damaged Check whether the power supply of the mainboard is abnormal Check whether the coil is abnormal Failure of T2A…

5.4 Outdoor unit main Control Board ports table

MDV V8/V8i Master Series Service Manual Figure 6-5.1: Outdoor unit main Control Board ports 206

Table 6-5.5: Main Control Board port definition Table

Label in Figure 5-2.1 Port code Content Port voltage 1 CN82 Reserved 5Vdc 2 CN36 Recirculation fan control port 3.3Vdc 3 CN70 EEVA drive port 12Vdc 4 CN71 EEVB drive port(Reserved) 12Vdc 5 CN72 EEVC drive port 12Vdc 6 CN73 EEVE drive port 12Vdc Microchannel heat exchanger inlet temperature…

5.5 Compressor & Fan drive board ports detection

Port reference and function definition of Compressor & Fan drive board MDV V8/V8i Master Series Service Manual Figure 6-5.2: Compressor & Fan drive board ports Table 6-5.5: Port definition and functions table: Label in Port Feature Figure 6-2.5 code identifier 1 CN1 P-in 2 CN5 P-out 3 CN16 L1 Three…

Table 6-5.5: Port definition and functions table (continues)

Label in Port Feature Figure 6-2.5 code identifier 6 CN38 - 7 CN26 - 8 CN3 DCFAN 9 CN8/C N9 O-Motor Content Port voltage Power supply terminal for DC fan drive board (P,N) 438Vdc~650Vdc(Rated 540Vdc; (Reserved） P is positive, N is negative) Fan module controls power supply(Reserved） 19V Three phase…

Fan drive board

MDV V8/V8i Master Series Service Manual Figure 6-5.3: Fan drive board Table 6-5.6: Compressor & Fan drive board port Label in Figure 5-2.5 210 Port code Content Port voltage 1 CN6 Fan module controls power supply(Reserved） 19V 2 CN2 EEPROM Program burning port 5V 3 CN4\CN1 4 CN7 5 CN3 Output power…

Inverter drive board measurement guidelines

Please give priority to the following things before testing Inverter drive board: 1) Cut off the power supply: 2) To avoid electric shock from capacitor discharge, power off for 10 minutes and wait for capacitor discharge before operation: 3) Remove all wiring on the Inverter drive board. Tools…

Schematic diagram of measuring points of Inverter drive board

5.6 Appendix of Pressure Sensor Detection

Pressure sensor characteristics 5.00 High Pressure sensor PH Low Pressure sensor PL 4.50 y = 2x + 0.5 y = 0.87x + 0.5 output voltage（V） 4.00 3.50 3.00 2.50 2.00 1.50 Part 6 - Diagnosis and Troubleshooting 1.00 0.50 0.00 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 Pressure（MPa) PH…

5.7 Refrigerant volume diagnosis

When running the refrigerant quantity detection program, the machine calculates the system refrigerant quantity according to the ambient temperature, condensing temperature and evaporation temperature, heat exchanger inlet and outlet temperature and other parameters, and give hints according to the…

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Confirm whether the following two points meet the requirements: 1. Whether all IDUs in the system are V8 series? 2. Does the system choose V8 communication protocol or HyperLink? Whether the above two points are consistent No The detection results of the system have V6 IDUs may have a large…

5.8 Oil volume table

S-V8MA

Ver. 2023-1 MBT Division Midea Group Add.: Midea Headquarters Building, 6 Midea Avenue, Shunde, Foshan, Guangdong, China Postal code: 528311 mbt.midea.com / global.midea.com/tsp.midea.com Note: Product specifications change from time to time as product improvements and developments are released and…

Инструкция на Наружные блоки VRF-систем MDV серий V8 Master и V8i Master

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