Related Manuals for Midea MS9V-18HRDN1-QC2(B) 9V SERIES
Summary of Contents for Midea MS9V-18HRDN1-QC2(B) 9V SERIES
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Page 1: Service Manual
9VSI-1010-A SERVICE MANUAL MIDEA AIRCONDITIONER DC INVERTER SPLIT WALL-MOUNTED TYPE MS9V-18HRDN1-QC2(B) MS9V-24HRDN1-QC2W 9V SERIES... -
Page 2: Table Of Contents
CONTENTS 1. Precaution ..............................1 1.1 Safety Precaution .......................... 1 1.2 Warning ............................1 2. Function ................................ 6 3. Dimension ..............................8 3.1 Indoor Unit ............................. 8 3.2 Outdoor Unit ..........................10 4. Refrigerant Cycle Diagram ........................11 5. Wiring Diagram ............................12 5.1 Indoor ............................ -
Page 3: Precaution
1. Precaution 1.1 Safety Precaution To prevent injury to the user or other people and property damage, the following instructions must be followed. Incorrect operation due to ignoring instruction will cause harm or damage. Before service unit, be sure to read this service manual at first. 1.2 Warning ... - Page 4 Be caution when unpacking and installing the product. Sharp edges could cause injury, be especially careful of the case edges and the fins on the condenser and evaporator. For installation, always contact the dealer or an Authorized service center. There is risk of fire, electric shock, explosion, or injury.
- Page 5 turn the product on. Do not use the telephone or turn switches on or off. There is risk of explosion or fire. If strange sounds, or small or smoke comes from product. Turn the breaker off or disconnect the power supply cable. There is risk of electric shock or fire.
- Page 6 Install the drain hose to ensure that water is drained away properly. A bad connection may cause water leakage. Keep level even when installing the product. To avoided vibration of water leakage. Do not install the product where the noise or hot air from the outdoor unit could damage the neighborhoods.
- Page 7 necessary. A dirty filter reduces the efficiency of the air conditioner and could cause product malfunction or damage. Do not insert hands or other object through air inlet or outlet while the product is operated. There are sharp and moving parts that could cause personal injury. ...
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Page 8: Function
2. Function Indoor unit Operation by remote controller Auto mode The mode can be change by the room Auto Restart Function temperature. When the power supply is interrupted and then Temp. Compensation restore, the air conditioners automatically restore the previous function setting Sensing by room temperature Self-cleaning Room temperature sensor. - Page 9 Outdoor unit Power relay control The unit has 3 min delay between continuously ON/OFF operations. Low noise air flow system Bird tail propeller fan makes the outdoor unit run more quietly. Hydrophilic aluminum fin The hydrophilic fin can improve the heating efficiency at operation mode. 4 way valve control It is only operated in the heating operation mode except defrosting operation.
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Page 10: Dimension
3. Dimension 3.1 Indoor Unit Dimension Mode MS9V-18HRDN1-QC2(B) 1084 MS9V-24HRDN1-QC2W MS9V-18HRDN1-QC2(B) - Page 11 MS9V-24HRDN1-QC2W：...
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Page 12: Outdoor Unit
3.2 Outdoor Unit MOC2-18HDN1-QC2 Dimension Mode MOF-24HDN1-QC2W Dimension Mode... -
Page 13: Refrigerant Cycle Diagram
4. Refrigerant Cycle Diagram... -
Page 14: Wiring Diagram
5. Wiring Diagram 5.1 Indoor MS9V-18HRDN1-QC2(B) MS9V-24HRDN1-QC2... -
Page 15: Outdoor Unit
5.2 Outdoor Unit MOC2-18HDN1-QC2 MOF-24HDN1-QC2W... -
Page 16: Installation Details
6. Installation details 6.1 Wrench torque sheet for installation Outside diameter Torque Additional tightening torque inch N·cm N·cm 1500 1600 Ф6.35 (153kgf.cm) (163kgf.cm) 2500 2600 Ф9.53 (255kgf.cm) (265kgf.cm) 3500 3600 Ф12.7 (357kgf.cm) (367kgf.cm) 4500 4700 Ф16 (459kgf.cm) (479kgf.cm) 6.2 Connecting the cables The power cord of connect should be selected according to the following specifications sheet. -
Page 17: Air Purging With Vacuum Pump
Caution: Capacity is base on standard length and maximum allowance length is base of reliability. Oil trap should be installed per 5-7 meters. 6.4 Air purging with vacuum pump Air and moisture in the refrigerant system have undesirable effects as below: ●... -
Page 18: Pumping Down (Re-Installation)
1. Completely tighten the flare nuts of the indoor and outdoor units, connect the manifold valve charge. 2. Connect the charge hose connection to the vacuum pump. 3. Fully open the handle Lo of the manifold valve. 4. Operate the vacuum pump to evacuate. After starting evacuation, slightly loose the flare nut of the Lo valve on the gas pipe side and check the air is entering. - Page 19 Procedure 1. Confirm that both the 2-way and 3-way valves are set to the opened position. Remove the valve stem caps and confirm that the valve stems are in the opened position. Be sure to use a hexagonal wrench to operate the valve stems. 2.
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Page 20: Re-Air Purging (Re-Installation)
6.6 Re-air purging (Re-installation) Procedure: 1. Confirm that both the 2-way and 3-way valves are set to the closed position. 2. Connect the charge set and a charging cylinder to the service port of the 3-way valve. Leave the valve on the charging cylinder closed. 3. -
Page 21: Balance Refrigerant Of The 2-Way, 3-Way Valves
Be sure to use a hexagonal wrench to operate the valve stems. 7. Mount the valve stems nuts and the service port cap. Be sure to use a torque wrench to tighten the service port cap to a torque 18N.m. Be sure to check the gas leakage. -
Page 22: Evacuation
6.8 Evacuation Procedure: 1. Connect the vacuum pump to the charge set’s centre hose. 2. Evacuation for approximately one hour. Confirm that the gauge needle has moved toward -0.1 Mpa (-76 cmHg) [vacuum of 4 mmHg or less]. 3. Close the valve (Low side) on the charge set, turn off the vacuum pump, and confirm that the gauge needle does not move (approximately 5 minutes after turning off the vacuum pump). -
Page 23: Gas Charging
6.9 Gas charging Procedure: 1. Connect the charge hose to the charging cylinder. Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of the cylinder. If the refrigerant is R410A, make the cylinder bottom up to ensure liquid charge. 2. -
Page 24: Operation Characteristics
7. Operation characteristics Mode Drying Cooling operation Heating operation Temperature operation ≥17℃ ≤ 30℃ ﹥10℃ Room temperature 0℃~50℃ Outdoor temperature (-15℃~50℃:For the models with -15℃~34℃ 0℃~ 50℃ low temperature cooling system) CAUTION: 1. If air conditioner is used outside of the above conditions, certain safety protection features may come into operation and cause the unit to function abnormally. -
Page 25: Electronic Function
8. Electronic function 8.1 Abbreviation T1: Indoor ambient temperature T2: Pipe temperature of indoor heat exchanger T3: Pipe temperature of outdoor heat exchanger T4: Outdoor ambient temperature T5： Discharge temperature 8.2 Display function 8.2.1 Icon explanation on indoor display board. Run indicator Flash at 0.5Hz when the unit is standby. -
Page 26: Main Protection
once again, all displays will resume. 8.3 Main Protection 8.3.1 Three Minutes Delay at restart for compressor. ---- 1 minutes delay for the 1 time start-up and 3 minutes delay for others. 8.3.2 Temperature protection of compressor top. ---- Top temp. protector cut off for 30s and restart the compressor with 3 minutes delay. 8.3.3 Temperature protection of compressor discharge. -
Page 27: Operation Modes And Functions
----Preheating release condition: ℃ or user turns on the m a If T4＞5 ---- Crankcase Heater ℃ and stops when T4>15℃ It starts when T4<5 8.4 Operation Modes and Functions 8.4.1 Fan only mode. (1) Outdoor fan and compressor stop. (2) Temperature setting function is disabled, and no setting temperature is display. - Page 28 After A/C starts up, the compressor will run at the Fmax frequency for 7 minutes. During the 7 minutes, frequency limitation is active. 7 minutes later, compressor running frequency will be controlled as below: While Temp.zone Frequency Note: When T1-Ts keep in the same temperature zone for 3 minutes, the compressor will run as the below rules: A~E: Increase the frequency to the higher level until to F8.
- Page 29 F: Keep the current frequency. G: Decrease the frequency to the lower level until to F1. ℃, com pressor will stop) H: Run at F1 for 1h (if T1-Ts<-2 Meanwhile, the compressor running frequency is limited by the current. TYPE I1COOL I2COOL I3COOL...
- Page 30 8.4.2.3 Indoor fan running rules In cooling mode, indoor fan runs all the time and the speed can be selected as high, medium, low and auto. Auto fan in cooling mode acts as follow: 8.4.2.4 Condenser high temperature T3 protection. When 55℃<T3<60℃, the compressor frequency will decrease to the lower level every 3 min until to F1 and then run at F1.IF T3<54℃, the compressor will keep running at the current frequency.
- Page 31 After AC starts up, the compressor will run at the Fmax frequency for 7 minutes according to outdoor ambient temp. During the 7 minutes, frequency limitation is active. 7 minutes later, compressor running frequency will be controlled as below: While Temp.
- Page 32 Note: When T1-Ts keep in the same temperature zone for 3 minutes, the compressor will run as the below rules: A~E: Increase the frequency to the higher level until to F10. F: Keep the current frequency. G: Decrease the frequency to the lower level until to F1. H: Run at F1 for 1h.(if T1-Ts-ΔT >6 ℃, compressor will stop) Meanwhile, the compressor running frequency is limited by the current.
- Page 33 8.4.3.3 Indoor fan running rules: The speed can be selected as high, medium, low and auto, the anti-cold-wind function has the priory. If reached the set temperature, the indoor fan transfers to lowest speed, the anti-cold wind function has the priory. If mode transferred or compressor restarted, indoor fan works with setting fan speed.
- Page 34 Auto fan action in heating mode. 8.4.3.4 Defrosting mode： Conditions of defrosting: Condition 1: If T4＞0 ℃, When the units are running, if any one of the following conditions is satisfied, the unit starts defrosting: ① If the accumulated time of the unit working within T3＜3 ℃ r eached 40 minutes and T3 keeps lower than -6 ℃...
- Page 35 For 18K units For 24K units Model MS9V-24HRDN1-QC2W+MOF-24HDN1-QC2W 8.4.3.5 High evaporator coil temp.T2 protection: TEH2 (1) T2> , compressor running frequency decreases to the lower level every 20s. If the frequency TEH2 decreased to F2 and the T2 still over for 3 minutes, the compressor will stop.
- Page 36 lower than 48 ℃ , or 48 ℃ < T2< TEH2 last for 6 minutes, release the frequency limit control. (2) If T2>60℃ , stop the compressor and restarts until T2<48℃ . Note: 53℃ TEH2 55℃ 8.4.4 Auto-mode This mode can be chosen with remote controller and the setting temperature can be changed between 17~30 ℃.
- Page 37 ℃, com presso In drying mode, if room temperature is lower than 10 temperature exceeds 12 ℃. 8.4.5.4 Evaporator anti-freezing protection, condenser high temperature protection and outdoor unit frequency limit are valid, and they are the same as that in cooling mode. 8.4.5.5 The outdoor fan operates same as in cooling mode.
- Page 38 setting “off” time, and then turn on automatically when reaching the setting “on” time. 8.4.7.6 The setting time is relative time. 8.4.7.7 The tolerance of timer is 1 minute per hour. 8.4.8 Sleep function mode 8.4.8.1 Operation time in sleep mode is 7 hours. After 7 hours the AC quits this mode and turns off. 8.4.8.2.
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Page 39: Troubleshooting
8.4.10.3 After starting the Clean Air function, the ionizer can work only when the indoor fan motor is running. If the indoor fan motor is off, the ionizer also stops working, even though the Clean Air function is available. 8.4.10.4 Switching the running mode will not stop the ionizer. When turning off the aircon, the ionizer is also turned off. -
Page 40: Indoor Unit Error Display
Bulb (25-40W) 9.1 Indoor Unit Error Display Display LED STATUS EEPROM parameter error Indoor / outdoor units communication protection Zero-crossing signal error Indoor fan speed out of control Open or short circuit of outdoor temperature sensor Open or short circuit of room or evaporator temperature sensor Outdoor fan speed out of control IBM malfunction or IGBT over-strong current protection Over voltage or too low voltage protection... -
Page 41: Diagnosis And Solution
9.2 Diagnosis and Solution 9.2.1 E0(EEPROM parameter error) error diagnosis and solution Shut off the power supply and turn on it 5s later Replace indoor PCB The problem comes out again Is the EEPROM chip plugged in indoor PCB well? Correct the connection Replace the main PCB of indoor unit... - Page 42 9.2.2 E1(indoor / outdoor units communication protection) error diagnosis and solution Turn off the power supply, after 1 minute, connect the power supply, and turn on the unit with remote controller The unit does not work normally. Check the wiring between indoor and outdoor unit. Is the connection of L, N, S and GND good? Reconnect and retest Is the LED4(red) bright and LED1(yellow)
- Page 43 9.2.3 E2(zero-crossing signal error) diagnosis and solution Turn off the power supply and turn on it again 5 seconds later Is power supply and Be sure the power supply is connection of connectors good correct good? connection Indoor defective. Replace the indoor PCB.
- Page 44 9.2.4 E3 (indoor fan speed out of control) diagnosis Shut off the power supply and turn on it 5s later The unit does not work normally Turn off the unit, rotate the cross fan. Disassemble the connection between fan Does it rotate freely? and motor, check if the bearing is normal.
- Page 45 9.2.6 P0 (IGBT over-strong current protection) diagnosis and solution. Check whether the connections between outdoor PCB and IPM are good? Check whether the IPM is fixed to radiator Fastening the IPM to the radiator tightly or if the fastening reliable The unit does not work normally Replace the compressor Replace the IPM...
- Page 46 9.2.8 P2 (temperature protection of compressor top) diagnosis and solution. Does compressor operate? Is the connection good? Reconnect retest. refrigerant circulation volume normal? Is protector normal? Replace the protector. Charge refrigerant Is abnormality the same after gas charging? Replace the outdoor PCB. Refrigerant is blocked(Such as capillary or welded points of the pipes.
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