Инструкция на Внутренние блоки промышленных сплит-систем MDV серии Quantum бренда MDV

Indoor and outdoor unit compatibility ODU 68kBtu/h MDV Quantum Indoor Units 76kBtu/h 96kBtu/h 120kBtu/h 2 Indoor Unit Indoor Unit Number of Branch Joint Capacity(kW) Model connectable IDU (Flexible branch header) High Static Pressure Duct 20 MDVID3-68HVR1D 1 / Medium Static Pressure Duct 10…

ODU

150kBtu/h 250kBtu/h Indoor Unit Number of Branch Joint Capacity(kW) Model connectable IDU (Flexible branch header) High Static Pressure Duct 45 MDVID3-150HVR1D Floor Standing 45 MDVIFST-150HVR1D 1 / Floor Standing 45 MDVIFST-150HVR1D High Static Pressure Duct 22.4 MDVID3-76HVR1D Floor Standing 22.4…

Notes

1. Standard: The port is standard, the customers can connect corresponding device through this port, such as water pump and Humidity sensor etc. Customized: The port is not available on the mainboard. If necessary, you need to customize the port Reserved: This port can not be used. 2. When…

2.2 Medium Static Pressure Duct

Figure 3.4: Medium Static Pressure Duct main PCB ports MDV Quantum Indoor Units Table 3.5: Medium Static Pressure Duct main PCB ports Label in Figure 3.4 1 Code CN1(L.N) CN22 (ALARM,N,AC2) CN12(H-L) CN29(H-N) CN100 Content Port voltage Note AC power input 220V AC Standard 220V AC Standard Reserved…

Table 3.5: Medium Static Pressure Duct main PCB ports (continued)

Label in Code Content Port voltage Note 7 CN81 T2 Temperature sensor connection 3.3V DC Standard 8 CN82 T1 Ambient Temperature sensor connection 3.3V DC Standard 9 CN83 T2B Temperature sensor connection 3.3V DC Standard 10 CN-A Sterilization module port 12V DC Standard 11 CN30 Display Panel…

2.3 Wall Mounted

Customized: The port is not available on the mainboard. If necessary, you need to customize the port

Reserved: This port can not be used. 2. When repairing, PQ connects after-sales tooling 3. D1D2 communication ports are used for group control communication. When connecting the group controller, the D1D2 port of the indoor units that are to be group controlled must be connected in daisy chain, and…

2.4 High Static Pressure Duct (18-56kW)

MDV Quantum Indoor Units Figure 3.10: High Static Pressure Duct main PCB ports (18-56kW) Table 3.11: High Static Pressure Duct main PCB ports (20-56kW) Label in Figure 3.10 1 Code CN1(L.N) CN22 2 3 (ALARM,N,AC2) CN12(H-L) CN29(H-N) Content Port voltage Note AC power input 220V AC Standard 220V AC…

Table 3.11: High Static Pressure Duct main PCB ports (continued)

Label in Code Content Port voltage Note 10 CN30 Display Panel connection 12V DC[5] Standard 11 CN35 Humidity sensor connection 3.3V DC[5] Standard 12 CN5 Water level switch port 3.3V DC[5] Standard 13 CN190 Drainage pump port 12V DC[5] Standard 14 CN18 Switch module 5V/12V DC[5] Standard 15 CN16…

MDV Quantum Indoor Units

Figure 3.11: Fan module ports (18-56kW) Table 3.12: High Static Pressure Duct main PCB ports (continued) Label in Code Content 1 CN1(N) Power input 220V AC Standard 2 CN2(L) Power input 220V AC Standard 3 CN21 Reserved 220V AC Reserved 4 CN22 Reserved 220V AC Reserved 5 CN8 Main control board…

Table 3.13: voltage test instructions

Label Code Content Picture 5V 5 CN8 Main control board connection GND 6 CN25 Program burning port(fan module) GND 5V Troubleshooting Guide 13

2.5 Ceiling&Floor

Figure 3.12: Ceiling&Floor main PCB ports Table 3.14: Ceiling&Floor main PCB ports Label in Figure 3.2 MDV Quantum Indoor Units Notes: 1. Code Content Port voltage Note CN1(L,N) AC power input 220V AC Standard 220V AC Standard Reserved 220V AC Reserved CN22 (ALARM,N,AC2) CN12(H-L) CN29(H-N) AC power…

Reserved: This port can not be used

2. When repairing, PQ connects after-sales tooling 3. D1D2 communication ports are used for group control communication. When connecting the group controller, the D1D2 port of the indoor units that are to be group controlled must be connected in daisy chain, and the group controller must be…

3 Indoor unit settings

MDV Quantum Indoor Units 3.1 Parameter settings Taking KJR-86S/BK as an example, the parameters can be set in the power-on or power-off state. ①Hold " " and " " for 3 seconds to enter the parameter setting interface, and the main interface will display "CC" ② Spot check a) Wired controller Parameter…

Table 4.1: Wired controller Parameter Settings(continues)

Parameter Code Parameter Name Whether indoor C05 ambient temperature is displayed C06 Parameter Range 00: No 01: Yes LED indicator of wired 00: Off controller 01: On Wired controller C07 Follow Me Celsius: -5.0 to 5.0 temperature Fahrenheit: -9.0 to 9.0 calibration C08 C09 C10 C12 C13 Common IDU, V8…

Table 4.1: Wired controller Parameter Settings(continues)

Parameter Code Parameter Name Parameter Range Default Value 00: Disable Whether energy C17 efficiency attenuation is displayed when Remarks 01: Enable 00/01 00 The setting is valid only when the wired controller is connected to a V8 power off IDU. 00: Disable Whether IDU filter C18 blockage is…

Table 4.2: Indoor unit Parameter Settings

Parameter Code Parameter Name Parameter Range Default Value Remarks IDU static pressure level: N00 Static pressure of IDU 00/01/02/03/ The IDU sets the selected corresponding static pressure FF 04/05/06/07/08/ (FF-there may be different default values for different series of indoor units) 09/~/19/FF…

Paramete

r Code Parameter Name Parameter Range Default Value Remarks 0-7 3 0-7 indicates 0 - 7°C (The value is accurate to 1°C or 1°F.) 0-10 5 0-10 indicates -4 - 6°C(The value is accurate to 1°C or 1°F.) 00/01 00 00/01/02 00 T1 temperature N13 difference for auxiliary heat source/alternative heat source to…

таблицы и схемы — в просмотре

Parameter

Code N35 N37 Parameter Name Q4/Q4C air outlet 4 setting One-to-more of wired controller enabled Parameter Range Default Value 00/01 00 00/01 00 Remarks 00 - Free control 01 - Off 00: No 01: Yes 00: Remote off (closed); N38 Remote On/Off port logic of the IDU 01: Remote off (open) 00/01 00 Note: When…

Parameter

Code N49 Parameter Name Condensation proof Parameter Range Default Value 00/01 00 Remarks 00: Invalid 01: Valid 00: Invalid N50 Human Detect Sensor 00/01/02 01 01: Used to adjust the set temperature when unattended 02: Used to turn off the unit when unattended 00: 15 min Setting temperature N51…

Parameter

Code Parameter Name Parameter Range Default Value 00/01/02 00 Ambient temperature N60 when preheating is Remarks 00: 5°C turned on 01: 0°C 02: (-5)°C 00: Disconnected N61 Fresh air dry contact 1 00/01 00 01: Connected Note: Applicable to FAPU only 00: Disconnected N62 Fresh air dry contact 2 00/01…

Parameter

Code Parameter Name Parameter Range Default Value 00/01/02/03/04 00 Remarks Anti-cold wind N74 temperature setting of 00/01/02/03: corresponds to different values; 04: Anti-cold wind disabled special IDUs 00: After the remote shutdown signal is canceled, the IDU runs in the preset mode or based on…

Check No

Parameters Remarks 11 Actual RH indoor humidity Actual value = value displayed 12 [―――] is displayed 13 Air discharge pipe temperature Actual value = value displayed 14 Compressor discharge temperature Actual value = value displayed 15 Target superheat Actual value = value displayed 16 EEV opening…

3.3 Function Descriptions

Indoor Units 3.3.1 Power failure memory function The power failure memory function can be used to ensure that, in the event of a power outage, the indoor units, which was in operation before, automatically restart once the power returns. When the power returns following a power outage, units with…

Display Panels 4.1 Appearance of Display Panel The appearance of the digital display panel used is shown in Figure 5.1. Figure 5.1: Digital display panel1 Display panel for Compact Four-way Cassette and Four-way Cassette (New 360 degree panel, standard panel) MDV Quantum Indoor Units LED display…

4.2 Output under Normal Operating Conditions

Unit state Digital display Standby Cooling and heating : set temperature Normal operation Operating dehumidify mode: set temperature Fan only mode: indoor ambient temperature Special operation1 Mode code Error2 Error code Notes: 1. The special operation modes refer to Table 7.2: Operating Status…

Control 5.1 Temperature Compensation Control Because of the installation position of Indoor Unit and different layout, indoor temperature detected by Indoor Unit may not consist with actual temperature. Indoor temperature could be compensated by controller (The parameter code is ”N25” “N26”) 5.2 EEV…

5.3 Start and Stop Control

Cooling (Dry) Cooling(Dry) T1 − T𝑠 ≥ （0 + ΔTC）℃ Enter standby mode when the set temperature is reached T1 − T𝑠 ＜（0 + ΔTC）℃ Enter standby mode when the set temperature is reached T1 − T𝑠 ＜（ − 1 + ΔTC）℃ Heating Heating T1 − T𝑠 ≥ （1 + ΔTC）℃ Note: The temperature compensation value (ΔTC) of cooling and…

5.4 Fan Control

5.4.1 Fan speeds control The IDU can work in seven-speeds or three-speeds. Seven-speeds When the Indoor Unit detects seven wind speeds the wind speed is set as follows. Sleep Speed 1 Speed 2 Speed 3 Speed 4 Speed 5 Speed 6 Speed 7 Auto Three-speeds When the Indoor Unit detects only three wind speeds…

Determine the initial fan speed of auto fan control

The initial fan speed is determined according to the difference between ambient indoor temperature (T1) and set temperature (TS), and it updates in the following situations: 1) The first time enter this mode 2) TS is changed 3) When switching between normal operation and silent operation 5.4.3…

5.5 Swing control

5.5.2 Vertical swing control

Figure 6.2 Vertical swing control Different IDU series have different adjustable swing angle and default swing angle under different functions. And each operation mode has its default adjustable range of swing angle. P1-P5 values vary because of the different operation modes and IDU series. For…

5.5.3 Individual louver control

Four-way Cassette and Compact Four-way Cassette have the individual louver control and the detail according to the following: a) Louver selection: After entering the louver selection operation, all air flap immediately stop at the current spot and record the current spot. If there is no parameter…

5.6 Operation mode control

Indoor Units Outdoor Unit is Heat Pump ①When the mode is set by ODU to VIP priority, Voting priority, Capability requirements priority, Cooling priority, heating priority, the Indoor Unit can be set to cooling, heating, dehumidification, ventilation modes. When the IDU set mode different from the…

5.7 Human Detect control

The Human detect sensor is optional. The operation mode of human detect control can be set by controller (N50). 1） When set the mode "Used to adjust the set temperature when unattended" and enter the unattended state1, the following logic is executed ① When the cooling/automatic cooling mode…

5.8 Controlling the Condensate Water Pump and Water Level Switch

1) 2) 3) Indoor Units When the IDU is powered on the first time, the water pump is forced to operate for 5 minutes. When the IDU and ODU are in cooling, dehumidification and self-cleaning mode, the water pump starts immediately and operates continuously. After this mode is stopped (stop or mode…

5.11 High ceiling setting

For embedded IDU series, such as Compact Four-way Cassette and Four-way Cassette, when the installation exceeds the specified height (default 3 meters), can enter the High ceiling setting ( The parameter code is”N31” ) to change . 3 meters high height, 4 meters high height or 4.5 meters high height…

5.13 Dry mode control

Indoor Units There is a difference between the control with humidity sensor and the control without humidity sensor, when the humidity sensor is damaged, the indoor unit automatically switches to the state without humidity sensor. Without humidity sensor Related settings: ①The temperature of dry…

Errors and operation code 6.1 Error Code Table Table 7.1: Error code Error Content code Emergency stop C61 A51 Outdoor unit fault C73 A72 The Humidity Unit fault C74 MDV Quantum Indoor Units Interlocking control Heat Recovery Ventilation Unit fault（non-serial application) Content code A01 A73 C75…

Table 7.1: Error code(continues)

Error Content code E33 E61 E62 E81 The external room temperature sensor short-circuits or cuts off Tcp (pre-cooled fresh air temperature sensor) shortcircuits or cuts off Tph (pre-heated fresh air temperature sensor) shortcircuits or cuts off TA (outlet air temperature sensor) short-circuits or cuts…

Troubleshooting Warning MDV Quantum Indoor Units All electrical work must be carried out by competent and suitably qualified, certified and accredited professionals and in accordance with all applicable legislation (all national, local and other laws, standards, codes, rules, regulations and other…

7.1.1 A01 – Emergency shutdown

Digital display Display position Error display Panel, display box, and wired controller The faulty IDU and other IDUs of the same system: stop running, displaying code "A01" (V6 platform indoor Error impact unit displays "A0" code) ODU of the same system: stop running, displaying code "A01" (V6…

7.1.2 A51 - ODU fault

Digital display Display position Error display Panel, display box, and wired controller The faulty IDU and other IDUs of the same system: The fan continues running, the EEV is closed, and code "A51" is displayed (V6 platform IDU displays the code "Ed") Error impact ODU of the same system: stops. The…

7.1.3 A72 - The error of the linked humidifying IDU is transmitted to the master IDU

Digital display Error display Indoor Units Display position (master IDU) Panel or display box Wired controller Spot check interface Error code is not query displayed Master IDU: operates normally. Humidifying IDUs: stop. Other IDUs of the same system: operate Error impact normally. ODU of the same…

7.1.4 A81 - Self-check fault

Digital display Display position Error display Panel, display box, and wired controller Faulty IDU: stops. Other IDUs of the same system: IDUs that share the same MS with the faulty IDU will stop operating, while other IDUs remain in operation. IDUs that share the same MS with the faulty IDU display…

7.1.5 A91 - Mode conflict (V6 communication protocol adopted)

Available when using V6 platform wired controller. Digital display Display position Panel, display box, and wired controller Error display (Note: Error codes are displayed 2 minutes after faults are triggered) Faulty IDU: The fan continues running, and the EEV is closed. Other IDUs of the same…

7.1.6 b11, b13 - Error in 1# electronic expansion valve coil, error in 2# electronic expansion valve coil Digital display Display position Error display Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same system: operate normally. Error impact Error trigger Error…

1. The error code corresponds to the following two situations

a. If there is only one electronic expansion valve port on the main control board of the IDU, when an error occurs in the electronic expansion valve coil connected to the EEV port, the error code is b05. b. If there are two electronic expansion valve ports on the main control board of the IDU named…

7.1.7 b12, b14 - Error in 1# electronic expansion valve body, error in 2# electronic expansion valve body Digital display Display position Panel or display box Error display Spot check interface query Error impact Wired controller Error code is not displayed The faulty IDU and other IDUs of the same…

7.1.8 b34, b35 - Stall protection for 1# water pump, stall protection on 2# water pump

Digital display Display position Error display Error impact Indoor Units Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same system: operate normally. ODU of the same system: operate normally. Error trigger The main control board of the IDU detects the pump rotation…

7.1.9 b36 - Water level switch alarm error

Digital display Display position Error display Error impact Error trigger Error recovery Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same system: operate normally. ODU of the same system: operate normally. The water level switch alarm is triggered when the…

1. The plug attached to the WATER port of the main control board corresponds to the following two cases: a. The factory default of IDUs without a water level switch uses a short-circuit plug to seal the WATER port. b. IDUs with a water level switch use a water level switch plug to seal the WATER…

7.1.10 C11 - Duplicate IDU address code

Digital display Display position Panel or display box Error display Error code and address code are displayed alternately (2) Wired controller Error code and address code flash simultaneously Faulty IDU: The fan continues running, and the EEV is closed. Other IDUs of the same system: The fan…

★Example: If one IDU is 5 HP and the address code is set to 1, then the query address at the centralized controller side or wired controller side is 1. If one IDU is 20 HP and the address code is set to 5, then this IDU has four address codes, which are 5, 6, 7, and 8, but the query address at the…

7.1.11 C21 - Abnormal communication between IDU and ODU

Digital display Error display Display position Panel, display box, and wired controller Faulty IDU: The fan continues running, and the EEV is closed. Other IDUs of the same system: The fan continues running, the EEV is closed, and error code "A51" is displayed (V6 platform IDU displays the code…

7.1.12 C41 - Abnormal communication between IDU main control board and fan drive board

Digital display Display position Error display Error impact Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same system: operate normally. ODU of the same system: operate normally. Error trigger If the main control board of an IDU has lost communication with the fan…

7.1.13 C51: communication exception between the IDU and wired controller

Indoor Units Note: The error code C51 can be triggered either at the IDU side or the wired controller side. LED display Display position If a powered-on IDU does not receive any message from the wired controller: 1) Wired controller: "C51" is displayed; 2) Panel or display box: The LED display and…

MDV Quantum Indoor Units

Troubleshooting 62 Cause 1: The communi cation wire does not meet antiinterference requirements Repl ace the communi cation wire that meets anti interference requirements Cause 2: The communi cation wire is bonded and connected or the w ire end metal oxidation exists, leading to the connection fai…

7.1.14 C61 - Abnormal communication between the IDU main control board and display control board

Note: The error code C61 can be triggered either at the IDU side or at the panel or display box side. Digital display Display position After power on, normal communication was not established between the indoor unit and the wired controller: 1) The wired controller does not display fault code; Error…

C61

Cause 1:Unplug the display box or panel communication wire from the main control board of powered indoor unit. Reconnect the communication cable or re-power the IDU Cause 2:Use a wrong port Use correct port by referring to the w7iring diagram Cause 3:The communication wire between the display…

7.1.15 C73 - Abnormal communication between the linked humidifying IDU and master IDU

Digital display Display position (master IDU) Error display Panel or display box Wired controller Spot check interface Error code is not query displayed Master IDU: operates normally. Humidifying IDUs: stop. Other IDUs of the same system: operate Error impact normally. ODU of the same system…

7.1.16 C76 - Abnormal communication between the main wired controller and secondary wired controller

Note: The error code C51 can be triggered either at the IDU side or at the wired controller side. Digital display Error display Display position The error code "C76" is displayed only on the secondary wired controller Error impact The faulty IDU and other IDUs of the same system: operate normally.…

7.1.17 C77, C78 - Abnormal communication between IDU main control board and 1# Expansion Board,

abnormal communication between IDU main control board and 2# Expansion Board Digital display Display position Error display Panel, display box, and wired controller Faulty IDU: The fan continues running, and the EEV is closed. Other IDUs of the same system: Error impact operate normally. ODU of the…

7.1.18 C79 - Abnormal communication between the IDU main control board and Switch module

Digital display Display position Error display Panel, display box, and wired controller Faulty IDU: The fan continues running, and the EEV is closed. Other IDUs of the same system: operate Error impact normally. MDV Quantum Indoor Units ODU of the same system: operate normally. Error trigger If the…

7.1.19 C81—The indoor unit is in a power-off state

Digital display Display position Central controller or various types of control terminal Error display software Error impact The faulty indoor unit and the panels, display boxes, and wired controllers connected to it will stop running, and the central controller or various types of control terminal…

7.1.20 d16 - Air inlet temperature of IDU is too low in heating mode

Digital display Display position Error display Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same system: operate normally. Error impact MDV Quantum Indoor Units Error trigger ODU of the same system: operate normally. If the air inlet temperature of the IDU is…

7.1.21 d17 - Air inlet temperature of IDU is too high in cooling mode

Digital display Error display Display position Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same system: operate normally. Error impact Error trigger ODU of the same system: operate normally. If the air inlet temperature of the IDU is higher than the set value…

7.1.22 d43: Refrigerant leak sensor service life reminder

Digital display Display position Fault Display Fault Impact Panel, display box, and wired controller The faulty IDU and other IDUs of the same system operate normally. ODUs of the same system operate normally. Fault Trigger Fault Recovery MDV Quantum Indoor Units Possible Cause Troubleshooting 72…

7.1.23 dE1 - Sensor control board fault

Digital display Display position Error display Error impact Panel, display box, and wired controller The faulty IDU and other IDUs of the same system: operate normally. ODU of the same system: operate normally. Error trigger If the main control board of an IDU has lost communication with sensor…

Digital display Display position Error display Error impact Panel, display box, and wired controller The faulty IDU and other IDUs of the same system: operate normally. ODU of the same system: operate normally. Error trigger If the main control board of an IDU has lost communication with PM2.5…

Digital display Display position Error display Error impact Panel, display box, and wired controller The faulty IDU and other IDUs of the same system: operate normally. ODU of the same system: operate normally. Error trigger If the main control board of an IDU has lost communication with CO2 sensor…

7.1.26 dE4 - Formaldehyde sensor fault

Digital display Display position Error display Error impact Panel, display box, and wired controller The faulty IDU and other IDUs of the same system: operate normally. ODU of the same system: operate normally. Error trigger If the main control board of an IDU has lost communication with…

7.1.27 dE5 - Human Detect sensor fault

Note: The human detector sensor on the smart panel is used to detect the location of the human body. Digital display Display position Error display Error impact Error trigger Panel, wired controller The faulty IDU and other IDUs of the same system: operate normally. ODU of the same system: operate…

7.1.28 E21, E24, E81 - T0 (fresh inlet air temperature sensor) short-circuits or cuts off, T1 (IDU return air temperature sensor) short-circuits or cuts off, and TA (outlet air temperature sensor) short-circuits or cuts off Digital display Display position Error display Error impact Panel, display…

sensors are short-circuited or open-circuited, but it is not able to determine if the T1 sensor is short-circuited or open-circuited. 4) Only the master unit needs to be connected to the T1/T0/TA sensors when the AHU kit is installed in parallel. Troubleshooting Guide 79

7.1.29 E31: wired controller temperature sensor failure

LED display Display position Panel or display box Fault Display Wired controller Panel, display box, and wired controller Fault Impact Fault Trigger Fault Recovery Possible Cause The faulty IDU and other IDUs of the same system operate normally. ODU of the same system operates normally. When the V8…

7.1.30 EA2 - Return air humidity sensor fault

Digital display Error display Error impact Error trigger Error recovery Display position Panel or display box Wired controller Spot check interface Error code is not query displayed The faulty IDU and other IDUs of the same system: operate normally. ODU of the same system: operate normally. If the…

7.1.31 F01, F11, F21 - T2A (heat exchanger liquid pipe temperature sensor) short-circuits or cuts off, T2 (heat exchanger middle temperature sensor) short-circuits or cuts off, and T2B (heat exchanger gas pipe temperature sensor) short-circuits or cuts off Digital display Display position Error…

7.1.32 P31/P34 - Fan drive board AC side overcurrent protection

Digital display Display position Error display Error impact Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same system: operate normally. ODU of the same system: operate normally. P31: The current value detected on the AC side of the fan drive board exceeds the…

7.1.33 P52 - The voltage of the power supply is too low

Digital display Display position Error display Error impact Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same system: operate normally. ODU of the same system: operate normally. Error trigger Power supply voltage is below the programmed protection threshold (165V)…

7.1.34 P5b: DC power cable sequence protection fault

Digital display Display position Fault Display Panel, display box, and wired controller Fault Impact Fault Trigger Fault Recovery Possible Cause The faulty IDU stops. Other IDUs of the same system operate normally. ODUs of the same system operate normally. The system detects that the power cables…

7.1.35 P71 - Main control board EEPROM fault

Digital display Display position Error display Error impact Error trigger Error recovery Possible cause Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same system: operate normally. ODU of the same system: operate normally. When the master chip cannot receive data…

7.1.36 P72 - IDU display control board EEPROM fault

Digital display Display position Error display Panel or display box The faulty IDU operates normally, and the error code is displayed on the panel or display box only. Other Error impact IDUs of the same system: operate normally. ODU of the same system: operate normally. Error trigger Error recovery…

7.1.37 U01 - Locked (electronic lock)

Digital display Display position Error display Error impact Panel, display box, and wired controller All IDUs of the same system: stop running, displaying code "U01" ODU of the same system: stops running, displaying code "U01" Error trigger When detecting that the ODU is locked Error recovery…

7.1.38 U11 - Unit model code not set

Digital display Display position Error display Panel, display box, and wired controller 1) The faulty IDU stops running. 2) Other IDUs of the same system: If the address for the faulty IDU has been set, other IDUs will operate normally. If the address of the faulty IDU was not set, other IDUs will…

7.1.39 U12 - Capacity(HP) code not set

Digital display Display position Error display Panel, display box, and wired controller 1) The faulty IDU stops running. 2) Other IDUs of the same system: If the address for the faulty IDU has been set, other IDUs will operate normally. Error impact If the address of the faulty IDU was not set…

7.1.40 U26 - Mismatch between indoor unit model and outdoor unit model

Digital display Indoor Units Display position Error display Panel, display box, and wired controller 1) The faulty IDU stops running. 2) Other IDUs of the same system will operate normally Error impact ODU of the same system: If there is one IDU in the system is operating normally, the ODU will…

7.1.41 U38 - Address code not detected

Digital display Display position Error display Panel, display box, and wired controller 1) The faulty IDU stops running. 2) Other IDUs of the same system: The fan continues running, the EEV is closed, and ODU error code "A51" Error impact is displayed (V6 platform IDU displays the code "Ed"). ODU of…

7.1.42 J01 - Motor failed more than once

Digital display Display position Error display Error impact Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same system: operate normally. ODU of the same system: operate normally. Error trigger If fan control faults have occurred 10 times in 120 min (1) Error…

7.1.43 J0b: Water pump motor drive fault

Digital display Fault Display Display position Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same system operate normally. Fault Impact ODUs of the same system operate normally. The water pump motor's drive board fails (note: The drive board here refers to the…

Troubleshooting

J0b Reconnect the loose plug Cause 2: The unit model code or horsepower code is incorrectly set Reset the unit model code or horsepower code Cause 3: The power supply is abnormal if the voltage is significantly lower than the normal value ( 140 V) or the voltage interrupts or drops instantaneously…

7.1.44 J1E: IPM (fan module) overcurrent protection

LED display Display position Fault Display Panel, display box, and wired controller Fault Impact The faulty IDU stops. Other IDUs of the same system: operate normally. ODU of the same system operates normally. The fault is triggered if one of the following conditions is met: Fault Trigger 1) The…

7.1.45 J11: instantaneous overcurrent protection for phase current

LED display Display position Fault Display Panel, display box, and wired controller Fault Impact Fault Trigger Fault Recovery Possible Cause The faulty IDU stops. Other IDUs of the same system: operate normally. ODU of the same system operates normally. The current value (AC) detected for any phase…

7.1.46 J3E - Low bus voltage fault

Digital display Display position Panel or display box Wired controller Spot check interface query Error code is not displayed Error display Error impact The faulty IDU stops. Other IDUs of the same system: operate normally. ODU of the same system: operate normally. Error trigger When the bus voltage…

7.1.47 J31 - High bus voltage fault

Digital display Display position Error display Panel, display box Wired controller Error impact The faulty IDU stops. Other IDUs of the same system: operate normally. ODU of the same system: operate normally. Error trigger When the bus voltage (DC voltage) is greater than the threshold value of the…

7.1.48 J43 - Phase current sample bias error

Digital display Display position Error display Panel, display box Wired controller Error impact The faulty IDU stops. Other IDUs of the same system: operate normally. ODU of the same system: operate normally. Error trigger When detecting that the current sample is 50% greater than 2.5 V Error…

7.1.49 J45 - Motor and IDU unmatched

Digital display Display position Error display Error impact Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same system: operate normally. ODU of the same system: operate normally. Error trigger If the motor code sent by the IDU main control board is not found in the…

7.1.50 J47 - IPM (fan module) and IDU unmatched

Digital display Display position Error display Error impact Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same system: operate normally. ODU of the same system: operate normally. Error trigger When detecting that the fan drive board does not match the set value of…

7.1.51 J5E - Motor startup failure

Digital display Error display Display position Panel, display box Wired controller Error impact The faulty IDU stops. Other IDUs of the same system: operate normally. ODU of the same system: operate normally. Error trigger Motor startup failure Error recovery Automatic recovery Motor winding…

7.1.52 J52: motor blocking protection

LED display Display position Fault Display Panel, display box, and wired controller Fault Impact ODU of the same system operates normally. Fault Trigger The motor is blocked. Fault Recovery Automatic recovery Possible Cause MDV Quantum Indoor Units The faulty IDU stops. Other IDUs of the same…

7.1.53 J55 - Speed control mode setting error

Digital display Display position Error display Panel, display box Wired controller Error impact Error trigger Error recovery The faulty IDU stops. Other IDUs of the same system: operate normally. ODU of the same system: operate normally. The IDU is non constant air flow control, but its main control…

Digital display Display position Error display Panel, display box Wired controller Error impact The faulty IDU stops. Other IDUs of the same system: operate normally. ODU of the same system: operate normally. Error trigger When the motor phase lacks protection Error recovery Automatic recovery The…

Appendix 8.1 Temperature Sensor Resistance Characteristics Table 9.1: Indoor temperature sensors resistance characteristics R25=10KΩ±3% B25/50=4100K±3% Resistance Resistance Resistance Temperature Resistance Resistance Resistance (°C) min(kΩ) Normal(kΩ) max(kΩ) (°C) min(kΩ) Normal(kΩ) max(kΩ) -40…

Table 9.1: Indoor temperature sensors resistance characteristics(continues)

Resistance Resistance Resistance Temperature Resistance Resistance Resistance (°C) min(kΩ) Normal(kΩ) max(kΩ) (°C) min(kΩ) Normal(kΩ) max(kΩ) 40 4.926 5.179 5.441 80 1.060 1.166 1.281 41 4.718 4.968 5.225 81 1.025 1.128 1.240 42 4.521 4.766 5.019 82 0.990 1.091 1.201 43 4.333 4.573 4.822 83 0.958…

Table 9.1: Indoor temperature sensors resistance characteristics(continues)

Resistance Resistance Resistance Temperature Resistance Resistance Resistance (°C) min(kΩ) Normal(kΩ) max(kΩ) (°C) min(kΩ) Normal(kΩ) max(kΩ) 120 0.308 0.351 0.400 121 0.299 0.342 0.389 122 0.291 0.332 0.379 123 0.283 0.324 0.370 124 0.276 0.315 0.360 125 0.268 0.307 0.351 126 0.261 0.299 0.342 127…

8.2 Ambient Temperature and Standard Saturation Pressure of R410A

Table 9.2: Ambient Temperature and Standard Saturation Pressure of R410A (saturated vapor state) MDV Quantum Indoor Units Ambient Saturated gauge Saturated Ambient Saturated gauge Saturated Ambient Saturated gauge Saturated gauge Temperature pressure gauge pressure Temperature pressure gauge…

Table 9.2: Ambient Temperature and Standard Saturation Pressure of R410A (saturated vapor state)-continue 50 2961.7 429.55 57 3487.2 505.78 64 4083.4 592.25 51 3032.8 439.87 58 3567.8 517.47 65 4175 605.54 52 3105.2 450.36 59 3649.9 529.38 66 4268.3 619.07 53 3178.9 461.05 60 3733.5 541.5 67 4363.5…

Table 9.3: Ambient Temperature and Standard Saturation Pressure of R410A (Saturated liquid state) -continue 1739.6 252.31 43 2505.8 363.44 57 3495.4 506.96 30 1787.8 259.3 44 2568.5 372.54 58 3575.9 518.64 31 1837 266.43 45 2632.4 381.8 59 3657.9 530.53 32 1887.1 273.7 46 2697.5 391.24 60 3741.3…

8.3 Ambient Temperature and Standard Saturation Pressure of R32

Table 9.4: Ambient Temperature and Standard Saturation Pressure of R32 Ambient Saturated gauge Saturated Ambient Saturated gauge Saturated Ambient Saturated gauge Saturated gauge Temperature pressure gauge pressure Temperature pressure gauge pressure Temperature pressure pressure (°C) (kPa) (psi)…

Table 9.4: Ambient Temperature and Standard Saturation Pressure of R32 (continue)

53 3263.1 473.27 59 3746.3 543.36 65 4282.9 621.19 54 3340.1 484.45 60 3831.9 555.77 66 4378 634.97 55 3418.6 495.82 61 3919 568.4 67 4474.7 649 56 3498.4 507.39 62 4007.6 581.25 68 4573.2 663.29 57 3579.6 519.17 63 4097.8 594.33 69 4673.4 677.82 58 3662.2 531.16 64 4189.6 607.64 70 4775.5 692.63…

Ver. 2025-02

Troubleshooting Guide MDV Professional Equipment Midea Group Add.: Midea Headquarters Building, 6 Midea Avenue, Shunde, Foshan, Guangdong, China Postal code: 528311 Midea reserves the right to change the specifications of the product, and to withdraw or replace products without prior notification or…

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