Midea V4+R Series, Service Manual

Page 1: ...Midea Headquarters Building 6 Midea Avenue Shunde Foshan Guangdong China Postal code 528311 Tel 86 757 26338346 Fax 86 757 22390205 cac 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 Commercial Air Conditioner Division Midea Group ...

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Page 3: ...R VRF 50 60Hz 201608 1 CONTENTS CONTENTS Part 1 General Information 3 Part 2 Component Layout and Refrigerant Circuits 11 Part 3 Control 23 Part 4 Field Settings 37 Part 5 Diagnosis and Troubleshooting 41 ...

Page 4: ...V4 R VRF 50 60Hz 2 201608 Midea V4 R Series Service Manual ...

Page 5: ...V4 R VRF 50 60Hz 201702 3 Part 1 General Information Part 1 General Information 1 Indoor and Outdoor Unit Capacities 4 2 External Appearance 6 3 Outdoor Unit Combinations 9 4 Combination Ratio 10 ...

Page 6: ... Q4 C Q4 T3 T2 T1 W DL F Z kW HP 1 8 0 6 18 18 18 18 2 2 0 8 22 22 22 22 22 22 22 22 22 2 8 1 28 28 28 28 28 28 28 28 28 28 3 6 1 25 36 36 36 36 36 36 36 36 36 36 36 4 5 1 6 45 45 45 45 45 45 45 45 45 45 45 5 6 2 56 56 56 56 56 56 56 56 56 7 1 2 5 71 71 71 71 71 71 71 71 71 71 8 0 3 80 80 80 80 80 80 80 9 0 3 2 90 90 90 90 90 90 90 10 0 3 6 100 100 11 2 4 112 112 112 112 112 14 0 5 140 140 140 140...

Page 7: ...2 10HP 10HP 12HP 14HP 14HP 14HP 16HP 16HP Outdoor unit 3 14HP 16HP 16HP 16HP 14HP 16HP 16HP 16HP Capacity 50HP 52HP 54HP 56HP 58HP 60HP 62HP 64HP Model MDV W D2RN1T C 1432 50 1460 52 1515 54 1580 56 1650 58 1700 60 1750 62 1800 64 Outdoor unit 1 8HP 10HP 10HP 10HP 14HP 14HP 14HP 16HP Outdoor unit 2 10HP 10HP 12HP 14HP 14HP 14HP 16HP 16HP Outdoor unit 3 16HP 16HP 16HP 16HP 14HP 16HP 16HP 16HP Outdo...

Page 8: ...or Units Table 1 2 1 Standard indoor unit appearance One way Cassette Two way Cassette Q1 Q2 Compact Four way Cassette Four way Cassette Q4 C Q4 Low Static Pressure Duct Medium Static Pressure Duct T3 T2 High Static Pressure Duct Wall mounted T1 W Ceiling Floor Floor Standing DL F Console Z ...

Page 9: ...covery ventilator appearance Heat Recovery Ventilator 2 3 Outdoor Units 2 3 1 Single units Table 1 2 3 Single outdoor unit appearance 8 10 12 14 16HP 2 3 2 Combinations of units Table 1 2 4 Combination outdoor unit appearance 18 20 22 24 26 28 30 32HP 34 36 38 40 42 44 46 48HP 50 52 54 56 58 60 62 64HP ...

Page 10: ... 201702 Midea V4 R Series Service Manual 2 4 MS boxes Table 1 2 5 MS box appearance Model name Appearance Max number of downstream indoor units MS01 N1 C 4 MS02 N1 C 8 MS04 N1 C 16 MS06 N1 C 24 MS02E N1 C 1 MS04E N1 C 1 ...

Page 11: ...0 20 2 61 5 22 2 68 0 24 2 73 0 26 2 80 0 28 2 85 0 30 2 90 0 32 2 96 0 34 3 FQZHW 03SB 101 0 36 3 106 5 38 3 113 0 40 3 120 0 42 3 125 0 44 3 130 0 46 3 135 0 48 3 143 2 50 4 FQZHW 04SB 146 0 52 4 151 5 54 4 158 0 56 4 165 0 58 4 170 0 60 4 175 0 62 4 180 0 64 4 Notes 1 The combinations of units shown in the table are factory recommended Other combinations of units are also possible 2 For systems...

Page 12: ...5 26 53 2 18 532 266 to 691 6 29 56 0 20 560 280 to 728 33 61 5 22 615 307 5 to 799 5 36 68 0 24 680 340 to 884 39 73 0 26 730 365 to 949 43 80 0 28 800 400 to 1040 46 85 0 30 850 425 to 1105 50 90 0 32 900 450 to 1170 53 96 0 34 960 480 to 1248 56 101 0 36 1010 505 to 1313 59 106 5 38 1065 532 5 to 1384 5 63 113 0 40 1130 565 to 1469 64 120 0 42 1200 600 to 1560 125 0 44 1250 625 to 1625 130 0 46...

Page 13: ...RF 50 60Hz 201702 11 Part 2 Component Layout and Refrigerant Circuits Part 2 Component Layout and Refrigerant Circuits 1 Layout of Functional Components 12 2 Piping Diagrams 14 3 Refrigerant Flow Diagrams 16 ...

Page 14: ...iew Figure 2 1 2 MDV 252 8 W D2RN1T C MDV 280 10 W D2RN1T C MDV 335 12 W D2RN1T C front view Electronic expansion valve Solenoid valve Solenoid valve Solenoid valve Electronic expansion valve DC fan motor Four way valve Four way valve Four way valve High pressure sensor Outdoor ambient temperature sensor High pressure switch Unloading valve DC fan motor Solenoid valve Solenoid valve Solenoid valve...

Page 15: ...2 1 4 MDV 400 14 W D2RN1T C MDV 450 16 W D2RN1T C front view Electronic expansion valve Solenoid valve Solenoid valve Electronic expansion valve High pressure switch High pressure sensor DC fan motor Four way valve Four way valve Four way valve Outdoor ambient temperature sensor DC fan motor Unloading valve Low pressure switch DC inverter compressor High pressure switch DC inverter compressor ...

Page 16: ... Oil balance stop valve Solenoid valve SV5 ST3 EXV B High pressure switch Low pressure switch Oil separator EXV A ST1 ST2 Heat exchanger 1 Heat exchanger 2 Liquid stop valve Low pressure gas stop valve High pressure gas stop valve Gas balance stop valve Accumulator ST3 Liquid stop valve Low pressure gas stop valve High pressure gas stop valve Gas balance stop valve Oil balance stop valve Low press...

Page 17: ... valve ST3 When the system is in total cooling mode ST3 is open When the system is in total heating mode or mixed mode ST3 is closed 7 Solenoid valve SV2 Protects the compressor If compressor discharge temperature rises above 100 C SV2 opens and sprays a small amount of liquid refrigerant to cool the compressor SV2 closes again once the discharge temperature has fallen below 90 C 8 Solenoid valve ...

Page 18: ... Check valve filter filter EXV filter filter EXV filter filter EXV FAN heat exchanging FAN heat exchanging FAN heat exchanging Indoor unit Indoor unit Indoor unit High Pressure Liquid High Pressure Balance Oil Balance To other outdoor unit Cooling Operation High temperature high pressure gas High temperature high pressure liquid Low temperature low pressure gas Fan ON ON Fan OFF OFF Fan OFF OFF In...

Page 19: ...alve filter filter EXV filter filter EXV filter filter EXV FAN heat exchanging FAN heat exchanging FAN heat exchanging Indoor unit Indoor unit Indoor unit High Pressure Liquid High Pressure Balance Oil Balance To other outdoor unit Mixed Cooling Operation High temperature high pressure gas High temperature high pressure liquid Low temperature low pressure gas Fan ON ON Fan ON ON Fan ON ON Indoor u...

Page 20: ...filter filter EXV filter filter EXV filter filter EXV FAN heat exchanging FAN heat exchanging FAN heat exchanging Indoor unit Indoor unit Indoor unit High Pressure Liquid High Pressure Balance Oil Balance To other outdoor unit Heating Operation High temperature high pressure gas High temperature high pressure liquid Low temperature low pressure gas Fan ON ON Fan ON OFF Fan ON ON Indoor unit operat...

Page 21: ...alve filter filter EXV filter filter EXV filter filter EXV FAN heat exchanging FAN heat exchanging FAN heat exchanging Indoor unit Indoor unit Indoor unit High Pressure Liquid High Pressure Balance Oil Balance To other outdoor unit Mixed Heating Operation High temperature high pressure gas High temperature high pressure liquid Low temperature low pressure gas Fan ON ON Fan ON ON Fan ON ON Indoor u...

Page 22: ... T7C1 Check valve filter filter EXV filter filter EXV filter filter EXV FAN heat exchanging FAN heat exchanging FAN heat exchanging Indoor unit Indoor unit Indoor unit High Pressure Liquid High Pressure Balance Oil Balance To other outdoor unit Cooling Oil Return High temperature high pressure gas High temperature high pressure liquid Low temperature low pressure gas Fan ON ON Fan OFF OFF Fan ON O...

Page 23: ... tube T7C1 Check valve filter filter EXV filter filter EXV filter filter EXV FAN heat exchanging FAN heat exchanging FAN heat exchanging Indoor unit Indoor unit Indoor unit High Pressure Liquid High Pressure Balance Oil Balance To other outdoor unit Other Mode Oil Return High temperature high pressure gas High temperature high pressure liquid Low temperature low pressure gas Fan ON ON Fan OFF OFF ...

Page 24: ... valve filter filter EXV filter filter EXV filter filter EXV FAN heat exchanging FAN heat exchanging FAN heat exchanging Indoor unit Indoor unit Indoor unit High Pressure Liquid High Pressure Balance Oil Balance To other outdoor unit Defrost High temperature high pressure gas High temperature high pressure liquid Low temperature low pressure gas Fan OFF ON Fan OFF OFF Fan OFF ON Indoor unit operat...

Page 25: ...z 201702 23 Part 3 Control Part 3 Control 1 General Control Scheme Flowchart 24 2 Stop Operation 25 3 Standby Control 25 4 Startup Control 26 5 Normal Operation Control 27 6 Protection Control 32 7 Special Control 34 ...

Page 26: ...ration Abnormal shutdown System stops A unit stops when the load demanded decreases 2 Standby control Crankcase heater control 3 Startup control Compressor startup delay control Startup control for cooling operation Startup control for heating operation 4 Thermo on Normal operation control Component control during normal operation Compressor output control Compressor step control Operation priorit...

Page 27: ...ystem stops all the units four way valves turn off 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 according to outdoor ambient temperature and discharge temperature When the outdoor ambient temperature is above 40 C the crankcase heater is off when...

Page 28: ...ording to discharge temperature Electronic expansion valve B EXVB Four way valve ST1 Off Four way valve ST2 Off Four way valve ST3 On Solenoid valve liquid refrigerant injection SV2 Off Solenoid valve oil balance SV4 Closed for 200 secs open for 600 secs then closed Solenoid valve fast defrosting SV5 Off Notes 1 Refer to Table 3 5 3 in Part 3 5 6 Outdoor Fan Control for more information on fan spe...

Page 29: ...r heat exchanger pipe temperature DC fan motor B FANB Electronic expansion valve A EXVA Position steps from 0 fully closed to 480 fully open controlled according to discharge superheat Electronic expansion valve B EXVB Four way valve ST1 On Four way valve ST2 On Four way valve ST3 Off Solenoid valve liquid refrigerant injection SV2 Only open if discharge temperature 100 o C Solenoid valve oil bala...

Page 30: ... 3 5 2 to 3 5 4 the master unit and slave units 1 2 and 3 are shown from left to right in that order and the circled numbers indicate the rotation sequence Figure 3 5 1 Compressor priority and rotation one outdoor unit Figure 3 5 2 Compressor priority and rotation two outdoor units Figure 3 5 3 Compressor priority and rotation three outdoor units BP No 1 BP1 No 1 No 2 BP2 BP BP No 1 No 2 No 2 No 1...

Page 31: ... 3 No 4 No 5 BP BP1 BP BP No 4 No 5 No 1 No 2 No 3 No 3 No 4 No 5 No 1 No 2 No 2 No 3 No 4 No 5 No 1 BP2 BP2 BP1 BP BP No 1 No 2 No 3 No 4 No 5 No 6 No 5 No 6 No 1 No 2 No 3 No 4 No 3 No 4 No 5 No 6 No 1 No 2 No 2 No 3 No 4 No 5 No 6 No 1 BP2 BP1 BP No 1 No 2 No 3 No 4 No 5 No 6 No 7 No 6 No 7 No 1 No 2 No 3 No 4 No 5 No 4 No 5 No 6 No 7 No 1 No 2 No 3 No 2 No 3 No 4 No 5 No 6 No 7 No 1 BP2 BP1 BP...

Page 32: ...ndby are fully closed When all outdoor units are running All EXVs are controlled according to discharge temperature In heating mode When all outdoor units are in standby All EXVs are at position 300 steps When some outdoor units are running and some outdoor units are in standby EXVs on running outdoor units are controlled according to discharge superheat EXVs of units in standby are fully closed W...

Page 33: ...0 250 250 290 290 3 290 290 290 290 330 330 4 330 330 330 330 360 360 5 360 360 410 410 530 530 6 460 460 500 500 630 630 7 500 500 630 630 710 710 8 super silent mode 630 630 710 710 800 800 9 670 670 760 760 870 870 10 silent mode 760 760 800 800 930 930 11 850 850 870 870 980 980 12 930 930 930 930 1110 1110 13 standard ESP mode 980 980 980 980 1110 1110 14 medium ESP mode 1050 1050 1050 1050 1...

Page 34: ...gh temperatures and transient spikes in temperature It is performed for each compressor Figure 3 6 3 Discharge temperature protection control When the discharge temperature rises above 120 C the system displays P4 protection and all units stop running When P4 protection occurs 3 times in 100 minutes the H6 error is displayed When an H6 error occurs a manual system restart is required before the sy...

Page 35: ...erature rises above 25 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 6 Disable heating control Current Currentmax Current Currentmax Normal operation Compressor current protection error code xP3 is displayed 72 o C Tf 76o C Tf 72o C Norm...

Page 36: ...e initial cumulative operating time reaches 140 minutes and then every 8 hours cooling for 4hours Tables 3 7 1 and 3 7 2 show component control during oil return operation in cooling mode Table 3 7 1 Outdoor unit component control during oil return operation in cooling mode Component Wiring diagram label 8 12HP 14 16HP Control functions and states Inverter compressor A COMP INV Controlled accordin...

Page 37: ...functions and states Inverter compressor A COMP INV Controlled according to load requirement Inverter compressor B COMP INV1 DC fan motor A FANA Controlled according to discharge pressure DC fan motor B FANB Electronic expansion valve A EXVA Fully open Electronic expansion valve B EXVB Four way valve ST1 Off Four way valve ST2 Off Four way valve ST3 On Solenoid valve liquid refrigerant injection S...

Page 38: ...HP Control functions and states Inverter compressor A COMP INV Controlled according to load requirement Inverter compressor B COMP INV1 DC fan motor A FANA Off DC fan motor B FANB Electronic expansion valve A EXVA Fully open Electronic expansion valve B EXVB Four way valve ST1 Off Four way valve ST2 Off Four way valve ST3 On Solenoid valve liquid refrigerant injection SV2 Normal control Solenoid v...

Page 39: ...V4 R VRF 50 60Hz 201702 37 Part 4 Field Settings Part 4 Field Settings 1 Outdoor Unit Field Settings 38 ...

Page 40: ...time is 6h 12h Night silent time is 8h 10h Night silent time is 8h 12h S3 Silent mode Night silent mode default Silent mode Super silent mode No silent mode S4 Static pressure Standard static pressure default Low static pressure mode reserved can be customized Medium static pressure mode reserved can be customized High static pressure mode reserved can be customized Notes 1 Black denotes the switc...

Page 41: ...nits is in the range 32 47 0 9 on ENC3 indicate 32 41 indoor units A F on ENC3 indicate 42 47 indoor units The number of indoor units is in the range 48 63 0 9 on ENC3 indicate 48 57 indoor units A F on ENC3 indicate 58 63 indoor units ENC1 Outdoor unit address Only 0 1 2 3 should be selected 0 is for master unit 1 2 3 are for slave units ENC2 Outdoor unit capacity 3 Only 0 1 2 3 4 5 6 7 should be...

Page 42: ...t time setting Switch Switch positions Description X Y S2 Night silent time is 6h 10h default 6 10 Night silent time is 6h 12h 6 12 Night silent time is 8h 10h 8 10 Night silent time is 8h 12h 8 12 Figure 4 1 2 Night silent mode example default setting 6h 10h S2 S2 S2 S2 Operation sound dB Load Maximum output 8 00 14 00 20 00 6 00 Night silent mode activated The outdoor unit senses the peak daytim...

Page 43: ...1608 41 Part 5 Diagnosis and Troubleshooting Part 5 Diagnosis and Troubleshooting 1 Outdoor Unit Electric Control Box Layout 42 2 Outdoor Unit Main PCB 44 3 Error Code Table 48 4 Troubleshooting 50 5 Appendix to Part 5 97 ...

Page 44: ...1 1 MDV 252 8 W D2RN1T C MDV 280 10 W D2RN1T C MDV 335 12 W D2RN1T C Outdoor Unit Electric Control Box Layout No Content 1 Electric control box assembly 2 Three phase bridge rectifier 3 Inverter module 4 Outdoor current detection board 5 Outdoor power supply board 6 DC fan module 7 Intermediate adapter board 8 Temperature sensor 9 Filter board 10 Reactor 11 Contactor 12 Power supply terminals 13 M...

Page 45: ... Outdoor Unit Electric Control Box Layout No Content 1 Electric control box assembly 2 Inverter module 3 Three phase bridge rectifier 4 Temperature sensor 5 Outdoor power supply board 6 Outdoor current detection board 7 Outdoor power supply board 8 DC fan module 9 Intermediate adapter board 10 Inverter module 11 Filter board 12 Reactor 13 Power supply terminals 14 Main PCB 15 Transformers 16 Trans...

Page 46: ...V4 R VRF 50 60Hz 44 201608 Midea V4 R Series Service Manual 2 Outdoor Unit Main PCB 2 1 Ports Figure 5 2 1 Outdoor unit main PCB ports 1 Notes 1 Label descriptions are given in Table 5 2 1 ...

Page 47: ...output 220V 17 CN57 CN59 Neutral terminals 0 18 CN32 No 1 transformer power output Voltage between upper two pins 13 5V AC voltage between lower two pins 9V AC 19 CN34 No 2 transformer power output Voltage between upper two pins 14 5V AC voltage between lower two pins 14 5V AC 20 CN39 Inverter module B control port Third pin on the left 3 3V DC 21 CN38 Inverter module B voltage monitor port 540V D...

Page 48: ...it address Master unit 0 slave units 1 2 3 1 Outdoor unit capacity Refer to Note 1 2 Number of outdoor units Displayed on master unit PCB only 3 Operating mode Refer to Note 2 4 Outdoor unit output metric total of all units Displayed on master unit PCB only 5 Indoor unit demand metric in cooling mode 6 Indoor unit demand metric in heating mode 7 Indoor unit demand metric in cooling mode after ambi...

Page 49: ...exchanger operating modes Refer to Note 4 25 EXVA position Steps value displayed 8 26 EXVB position Steps value displayed 8 27 Compressor discharge pressure MPa Actual value value displayed 0 1 28 Number of indoor units currently in communication with master unit Actual value value displayed 29 Number of indoor units currently operating in cooling mode Actual value value displayed 30 Number of ind...

Page 50: ...d 1 Notes 1 If an inverter module error occurs refer to Part 5 4 19 xH4 Troubleshooting The error code is displayed on the digital display 3 Error Code Table Table 5 3 1 Error code table Error code 1 Content Remarks E0 Communication error between outdoor units Only displayed on the slave unit with the error E1 Phase sequence error Displayed on the unit with the error E2 Communication error between...

Page 51: ... the unit with the error P5 Outdoor heat exchanger temperature protection Displayed on the unit with the error xP6 xH4 Inverter module protection When X is 1 it means A inverter module 2 means B inverter module P9 H9 Fan module protection Displayed on the unit with the error PL C7 Inverter module temperature protection Displayed on the unit with the error xL0 Inverter module protection xL1 DC bus ...

Page 52: ...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 Power off the outdoor units before connecting or disconnecting any connections or wiring otherwise electric shock which can cause physical injury or death may occur or damage to components may occur Warning ...

Page 53: ...ror between outdoor units All units stop running Error code is only displayed on the slave unit with the error Possible causes 4 2 3 Incorrect outdoor unit address setting Communication wires between outdoor units not connected properly Loosened wiring within electric control box Damaged main PCB or electric control box communication terminals block ...

Page 54: ...acing outdoor main PCB resolves the error No Replace electric control box communication terminals block Notes 1 The master unit address should be set as 0 slave units addresses should be set from 1 to 3 and the addresses should not be repeated within one system Refer to Part 4 1 1 PCB Switches and Switch Settings 2 All the wires for H1 H2 E connections should be three core shielded cable the wirin...

Page 55: ...igital display output 4 3 1 Description 4 3 2 Phase sequence error All units stop running Error code is only displayed on the unit with the error Possible causes 4 3 3 Power supply phases not connected in correct sequence Power supply terminals loose Power supply abnormal Main PCB damaged ...

Page 56: ... If the wiring connection of each outdoor unit is in A B C phase sequence and multiple units are connected the current difference between C phase and A B phases will be very large as the power supply load of each outdoor unit will be on C phase This can easily lead to tripped circuits and terminal wiring burnout Therefore if multiple units are to be used the phase sequence should be staggered so t...

Page 57: ...g Error code is only displayed on the master unit Possible causes 4 4 3 Communication wires between indoor and outdoor units not connected properly Indoor unit power supply abnormal Loosened wiring within electric control box Interference from high voltage wires or other sources of electromagnetic radiation Communication wire too long Damaged main PCB or electric control box communication terminal...

Page 58: ...ng fluorescent lamp Yes Remove the source of interference or add additional shielding to the communication wires No The length of communication wire is over 1200m Yes Reduce the wire length to less than 1200m or strengthen the signal No Replacing outdoor main PCB resolves the error No Replace electric control box communication terminals block5 Notes 1 Measure the resistance among P Q and E The nor...

Page 59: ...2 E4 indicates an outdoor ambient temperature sensor error and condenser pipe temperature sensor error E7 indicates discharge pipe temperature sensor error All units stop running Error code is only displayed on the unit with the error Possible causes 4 5 3 Temperature sensor not connected properly or has malfunctioned Damaged main PCB ...

Page 60: ...beled 32 in Figure 5 2 1 in Part 5 2 2 Ports Compressor top temperature sensor and discharge pipe temperature sensor connections are ports CN10 and CN11 on the main PCB labeled 1 and 2 respectively in Figure 5 2 1 in Part 5 2 2 Ports 2 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 characteristi...

Page 61: ...cription 4 6 2 Abnormal power supply voltage All units stop running Error code is only displayed on the unit with the error Possible causes 4 6 3 Outdoor unit power supply voltage not within 10 of rated voltage or a phase is missing Loosened wiring within electric control box High voltage circuit error Main PCB damaged ...

Page 62: ...Outdoor Unit Electric Control Box Layout and to the V4 R Engineering Data Book Part 2 5 Wiring Diagrams 3 The normal resistances of the inverter compressor are 0 7 1 5Ω among U V W and infinite between each of U V W and ground If any of the resistances differ from these specifications the compressor has malfunctioned Refer to Figures 5 4 6 and 5 4 7 in Part 5 4 19 6 xL0 troubleshooting 4 The norma...

Page 63: ...leshooting 4 7 E8 Troubleshooting Digital display output 4 7 1 Description 4 7 2 Outdoor unit address error All units stop running Error code is only displayed on the unit with the error Possible causes 4 7 3 Invalid outdoor unit address Main PCB damaged ...

Page 64: ...he valid range1 Yes Slave units addresses should be set from 1 to 3 No Replace the outdoor main PCB Notes 1 The master unit address should be set as 0 slave units addresses should be set from 1 to 3 and the addresses should not be repeated within one system Refer to Part 4 1 1 PCB Switches and Switch Settings ...

Page 65: ...elated electrical components with 1 representing compressor system A and 2 representing compressor system B Description 4 8 2 1E9 indicates a compressor A EEPROM mismatch 2E9 indicates a compressor B EEPROM mismatch All units stop running Error code is only displayed on the unit with the error Possible causes 4 8 3 Outdoor unit was powered on immediately after being powered off Main PCB damaged ...

Page 66: ...ely after being powered off1 Yes Power off the unit and wait for the digital display to turn off before restarting the unit No Replace outdoor main PCB Notes 1 When performing a manual restart of an outdoor unit once the unit has been powered off it should not be powered on again until the digital display has turned off ...

Page 67: ...1H0 indicates a communication error between the main control chip and the compressor A inverter driver chip 2H0 indicates a communication error between the main control chip and the compressor B inverter driver chip H1 indicates a communication error between the main control chip and the communication chip All units stop running Error code is only displayed on the unit with the error Possible caus...

Page 68: ...e between CN31 and CN33 terminals is 220V between GND and the 5V pins of CN35 is 5V between GND and 12V pins of CN35 is 12V If one or more of the voltages are not normal the power supply for main PCB and transformer is abnormal 2 Measure the voltages of ports CN32 and CN34 on the main PCB labeled 18 and 19 respectively in Figure 5 2 1 in Part 5 2 1 Ports The normal voltage across the upper two pin...

Page 69: ...hat the number of slave units detected by master unit has increased All units stop running Error code is only displayed on the master unit Possible causes 4 10 3 Some outdoor units are powered off Power supply abnormal Incorrect outdoor unit address setting Communication wires between outdoor units not connected properly Loosened wiring within electric control box Damaged main PCB or electric cont...

Page 70: ...s Power on all the outdoor units No The power supply is abnormal Yes Check the power supply equipment No Troubleshoot as for an E0 error2 Notes 1 Check LED1 on the main PCB If LED1 is on the main PCB is powered on if LED1 is off the main PCB is powered off Refer to Figure 5 2 5 in Part 5 2 2 1 Layout 2 See Part 5 4 2 E0 Troubleshooting ...

Page 71: ... set on main PCB All units stop running Error code is only displayed on the master unit Possible causes 4 11 3 Number of indoor units set on main PCB not same as actual number of indoor units Some indoor units are powered off Communication wires between indoor and outdoor units not connected properly Indoor unit PCB damaged Indoor unit without address or indoor unit address duplicated Main PCB dam...

Page 72: ...ting guide Resolving the indoor unit error resolves the outdoor unit error No Two or more indoor units are assigned the same address3 No Yes Setting the indoor units addresses uniquely resolves the error No Replace outdoor main PCB Notes 1 The number of indoor units can be set on switches EN3 and S12 on the main PCB Refer to Part 4 1 1 PCB Switches and Switch Settings 2 Indoor unit error code E1 i...

Page 73: ... the system displays H8 protection and all units stop running When the discharge pressure returns to normal H8 is removed and normal operation resumes Error code is only displayed on the unit with the error Possible causes 4 12 3 Outdoor unit stop valves are closed Pressure sensor not connected properly or has malfunctioned Insufficient refrigerant Low pressure side blockage Poor evaporator heat e...

Page 74: ...der of mega Ohms or infinite the pressure sensor has failed Refer to Part 2 1 Layout of Functional Components 3 To check for insufficient refrigerant 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 pip...

Page 75: ...r the address 1 2 or 3 of the slave unit with the error Description 4 13 2 1Hd indicates an error on the slave unit with address 1 2Hd indicates an error on the slave unit with address 2 3Hd indicates an error on the slave unit with address 3 All units stop running Error code is only displayed on the master unit Possible causes 4 13 3 Slave unit malfunction ...

Page 76: ...V4 R VRF 50 60Hz 74 201608 Midea V4 R Series Service Manual Procedure 4 13 4 yHd Check relevant slave unit ...

Page 77: ...nit with the error Possible causes 4 14 3 Outdoor unit stop valves are closed Temperature sensor switch not connected properly or has malfunctioned Insufficient refrigerant System blockage Indoor load too large System contains air or nitrogen Poor condenser heat exchange Main PCB damaged Procedure 4 14 4 P0 P4 H6 ODU stop valves are closed Yes Open the stop valves No Compressor top temperature sen...

Page 78: ...igerant 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 These issues disappear once sufficient refrigerant has been charged into the system For normal system parameters refer to Tables 5 5 4 and 5...

Page 79: ...rotection will disappear once the system reaches a steady state Error code is only displayed on the unit with the error Possible causes 4 15 3 Outdoor unit stop valves are closed Pressure sensor switch not connected properly or has malfunctioned Excess refrigerant System contains air or nitrogen High pressure side blockage Poor condenser heat exchange Main PCB damaged Procedure 4 15 4 P1 ODU stop ...

Page 80: ...re to be lower than normal discharge pressure to be higher than normal and suction pressure to be higher than normal For normal system parameters refer to Tables 5 5 4 and 5 5 5 in Part 5 5 2 5 2 Normal Operating Parameters of Refrigerant System 4 Air or nitrogen in the system causes discharge temperature to be higher than normal discharge pressure to be higher than normal compressor current to be...

Page 81: ...rotection has occurred 3 times in 60 minutes When an H5 error occurs a manual system restart is required before the system can resume operation If the system has a 3 phase protector and the 3 phase protector is connected to the low pressure switch the system will display P2 protection when initially powered on and P2 protection will disappear once the system reaches a steady state Error code is on...

Page 82: ...charge 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 These issues disappear once sufficient refrigerant has been charged into the system For normal system parameters refer to Tables 5 5 4 and 5 5 5 in Part 5 5 2 5 2 Normal Operating Parameters of Refrigerant System 2 A low pressure side blockage caus...

Page 83: ...turns to the normal range P3 is removed and normal operation resumes Error code is only displayed on the unit with the error Possible causes 4 17 3 Outdoor unit stop valves are closed Indoor load too large Power supply abnormal Sudden interruption of power to IDUs Excess refrigerant System contains air or nitrogen Poor condenser heat exchange High pressure side blockage Inverter module damaged Com...

Page 84: ...Refrigerant System 3 Air or nitrogen in the system causes discharge temperature to be higher than normal discharge pressure to be higher than normal compressor current to be higher than normal abnormal compressor noise and an unsteady pressure meter reading For normal system parameters refer to Tables 5 5 4 and 5 5 5 in Part 5 5 2 5 2 Normal Operating Parameters of Refrigerant System 4 In cooling ...

Page 85: ...stem displays P5 protection and all units stop running When the temperature returns to the normal range P5 is removed and normal operation resumes Error code is only displayed on the unit with the error Possible causes 4 18 3 Outdoor unit stop valves are closed Temperature sensor not connected properly or has malfunctioned Indoor load too large System contains air or nitrogen Poor condenser heat e...

Page 86: ...ent with the sensor s resistance characteristics table the sensor has failed Refer to Part 2 1 Layout of Functional Components and to Table 5 5 1 in Part 5 5 1 Temperature Sensor Resistance Characteristics 3 An indoor load that is too large causes suction and discharge temperatures to be higher than normal For normal system parameters refer to Tables 5 5 4 and 5 5 5 in Part 5 5 2 5 2 Normal Operat...

Page 87: ...is required before the system can resume operation The cause of an xH4 error should be addressed promptly in order to avoid system damage All units stop running Error code is only displayed on the unit with the error Possible causes 4 19 3 Inverter module protection DC bus low or high voltage protection MCE error Zero speed protection Phase sequence error Excessive compressor frequency variation A...

Page 88: ...in one second protection xL9 Actual compressor frequency differs from target frequency by more than 15Hz protection Notes 1 x is a placeholder for the compressor system compressor and related electrical components with 1 representing compressor system A and 2 representing compressor system B The specific error codes xL0 xL1 xL2 and xL4 can also be obtained from the inverter module LED indicators I...

Page 89: ...round If any of the resistances differ from these specifications the compressor has malfunctioned Figure 5 4 6 Measuring resistances among compressor terminals Figure 5 4 7 Measuring resistances between compressor terminals and ground If the resistances are normal go to Step 2 Step 2 Check inverter module The DC voltage between terminals P and N should be 1 41 times the local power supply voltage ...

Page 90: ...and 2 The normal value is 510 580V If the voltage is lower than 510V go to Step 2 Figure 5 4 9 Inverter module terminals Step 2 Check rectifier wiring circuit If the wires are loose fasten the wires If the wires are OK replace the main PCB Figure 5 4 10 Rectifier and AC filter board in electric control box Check 3 phase bridge rectifier wiring Check AC filter board wiring 3 5 1 2 4 N P 3 5 1 2 4 N...

Page 91: ...ssor has malfunctioned Refer to Figures 5 4 6 and 5 4 7 in Part 5 4 19 6 xL0 troubleshooting If the resistance values are normal go to Step 2 Step 2 Check compressor and main PCB If there is another unit nearby either in the same system or another system that is operating normally its electric control box can be used to determine whether the xL8 xL9 error is being caused by a compressor fault or a...

Page 92: ... 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 Refer to Figure 5 4 16 for further details regarding inspecting compressor oil If the compressor oil has been spoiled the compressor will not be being lubricated effectively The scroll plate crankshaft and bearings will wear Abras...

Page 93: ... 5 4 15 Step 7 Add compressor oil Add 1 2L of oil to the new compressor through the discharge pipe using a funnel Add 1 2L of oil to each of the compressors from which oil was drained in Step 3 Only use FV68H oil Different compressors require different types of oil Using the wrong type of oil leads to various problems Add additional oil to the accumulators such that the total amount of oil is 5L i...

Page 94: ...ervice Manual Figure 5 4 17 Effects of spoiled compressor oil Worn scroll plate Worn scroll plate Normal compressor bearings Seriously worn and damaged bearings Filter blocked by impurities which leads to abnormal compressor suction Worn crankshaft ...

Page 95: ...sible causes 4 20 3 Switch ENC2 incorrectly set Power or communication wires not connected properly Fan motor blocked or has failed Power supply abnormal AC filter board damaged Fan module damaged Main PCB damaged Procedure 4 20 4 P9 H9 The capacity set on switch ENC2 on the main PCB and the capacity given on the unit s nameplate do not match1 Ensure the setting on switch ENC2 matches the unit cap...

Page 96: ...tch Settings 2 Refer to Figures 5 1 1 and 5 1 3 in Part 5 1 Outdoor Unit Electric Control Box Layout and to the V5 X Engineering Data Book Part 2 5 Wiring Diagrams 3 Refer to Part 2 1 Layout of Functional Components 4 The normal voltage between P and N on the fan module is 310V DC Refer to Figures 5 1 1 and 5 1 3 in Part 5 1 Outdoor Unit Electric Control Box Layout and to Figure 5 4 18 Figure 5 4 ...

Page 97: ...e rises above 80o C the system displays PL protection and all units stop running C7 indicates PL protection has occurred 3 times in 100 minutes When a C7 error occurs a manual system restart is required before the system can resume operation Error code is only displayed on the unit with the error Possible causes 4 21 3 Blocked dirty or loose heat sink Temperature sensor not connected properly or h...

Page 98: ...e the sensor No Replace outdoor main PCB Notes 1 Refer to Figures 5 1 1 and 5 1 3 in Part 5 1 Outdoor Unit Electric Control Box Layout 2 Refer to Figures 5 1 1 and 5 1 3 in Part 5 1 Outdoor Unit Electric Control Box Layout 3 Inverter module temperature sensor connection is port CN4 on the main PCB labeled 3 in Figure 5 2 1 in Part 5 2 2 Ports 4 Measure sensor resistance If the resistance is too lo...

Page 99: ... 1 537 112 0 4470 7 52 24 33 6 981 73 1 485 113 0 4348 6 49 32 34 6 684 74 1 435 114 0 4230 5 46 57 35 6 400 75 1 387 115 0 4116 4 44 00 36 6 131 76 1 341 116 0 4006 3 41 59 37 5 874 77 1 291 117 0 3899 2 39 82 38 5 630 78 1 254 118 0 3796 1 37 20 39 5 397 79 1 2133 119 0 3695 0 35 20 40 5 175 80 1 174 120 0 3598 1 33 33 41 4 964 81 1 136 121 0 3504 2 31 56 42 4 763 82 1 100 122 0 3413 3 29 91 43 ...

Page 100: ...8 275 9 32 40 57 72 8 940 112 2 630 7 261 4 33 38 89 73 8 643 113 2 559 6 247 8 34 37 30 74 8 358 114 2 489 5 234 9 35 35 78 75 8 084 115 2 422 4 222 8 36 34 32 76 7 820 116 2 357 3 211 4 37 32 94 77 7 566 117 2 294 2 200 7 38 31 62 78 7 321 118 2 233 1 190 5 39 30 36 79 7 086 119 2 174 0 180 9 40 29 15 80 6 859 120 2 117 1 171 9 41 28 00 81 6 641 121 2 061 2 163 3 42 26 90 82 6 430 122 2 007 3 15...

Page 101: ... 23 59 75 63 12 22 103 3 418 16 423 0 24 57 17 64 11 79 104 3 326 15 399 8 25 54 71 65 11 39 105 3 235 14 378 0 26 52 36 66 10 99 106 3 148 13 357 5 27 50 13 67 10 62 107 3 063 12 338 2 28 48 01 68 10 25 108 2 982 11 320 1 29 45 99 69 9 909 109 2 902 10 303 1 30 44 07 70 9 576 110 2 826 9 287 1 31 42 23 71 9 253 111 2 747 8 272 0 32 40 48 72 8 947 112 2 672 7 257 8 33 38 81 73 8 646 113 2 599 6 24...

Page 102: ...tem has been running normally for more than 30 minutes Table 5 5 4 Outdoor unit cooling mode operating parameters Outdoor ambient temperature C 10 10 to 26 26 to 31 31 to 41 41 Average discharge temperature C 60 76 62 78 65 82 67 92 69 92 Average discharge superheat C 17 30 17 33 17 34 17 36 10 32 Discharge pressure MPa 2 3 2 8 2 3 2 8 2 4 3 6 2 6 3 8 3 1 4 2 Suction pressure MPa 0 6 0 7 0 7 0 9 0...

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Page 104: ...ng 6 Midea Avenue Shunde Foshan Guangdong China Postal code 528311 Tel 86 757 26338346 Fax 86 757 22390205 cac 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 Commercial Air Conditioner Division Midea Group ...