SERVICE MANUAL MIDEA AIRCONDITIONER DC INVERTER SPLIT WALL-MOUNTED TYPE MSX-18HRDN1-QC2 V1.
CONTENTS 1. Precaution................................................................................................................................................. 1 1.1 Safety Precaution ................................................................................................................................................ 1 1.2 Warning ...............................................................................................................................................................
10. Troubleshooting ................................................................................................................................... 29 10.1 Indoor Unit Error Display ................................................................................................................................. 30 10.2 Diagnosis and Solution.................................................................................................................................... 31 10.3 Key parts checking.
1. Precaution 1.1 Safety Precaution installation stand. and property damage, the following instructions It may cause injury, accident, or damage to the product. Be sure the installation area does not must be followed. deteriorate with age. To prevent injury to the user or other people Incorrect operation due to ignoring instruction will cause harm or damage. Before service unit, be sure to read this service manual at first.
arrives. There is risk of property damage, failure of product, or electric shock. Do not open the inlet grill of the product It may cause corrosion on the product. Corrosion, particularly on the condenser and evaporator fins, could cause product malfunction or inefficient operation. during operation. (Do not touch the electrostatic filter, if the unit is so equipped.) Operational There is risk of physical injury, electric shock, or product failure.
your skin or clothes, wash it well with clean The chemical in batteries could cause burns or other water. Do not use the remote of the batteries health hazards have leaked.
2. Function Indoor unit Operation by remote controller Sensing by room temperature Room temperature sensor. Pipe temperature sensor. Room temperature control Maintain the room temperature in accordance with the setting temperature. Anti-freezing control in cooling Ionizer/Plasma (Optional) Prevent the water being frozen on evaporator by sensing the evaporator pipe temperature in cooling mode Self clean Time Delay Safety control Restarting is for approx. 3 minutes..
Outdoor unit Power relay control The unit has 3 mins 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. Anti-rust cabinet Made from electrolytic zinc steel sheet and anti-rust coated components.
3. Dimension 3.1 3.
4. Specification Indoor Outdoor MSX-18HRDN1-QC2 MOF-18HDN1-QC2 Power supply Ph-V-Hz 1, 220-240V~, 50Hz Capacity Btu/h 17000(5300~23000) Input W 1550(400~2300) Rated current A 6.7(1.8~10.4) EER Btu/w.h, w/w Capacity Btu/h Input W 1460(360~2100) Rated current A 6.3(1.6~9.5) COP W/W 3.61 Moisture Removal L/h 1.5 Max. input consumption W 2700 Max. current A 15 Starting current A 10.
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6. Wiring diagram 6.
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7. Installation details 7.1 Wrench torque sheet for installation Outside diameter 7.2 Torque mm inch Kgf.m Ф6.35 1/4 1.8 Ф12.7 1/2 5.5 Connecting the cables The power cord of connect should be selected according to the following specifications sheet. Grade Unit mm 7.3 2 9K 12K 18K 1.5 1.5 2.5 Pipe length and the elevation Btu/h 18K Standard Pipe size Capacity Max. Max.
leakage from the refrigeration cycle. Procedure Caution: 1. Recheck the piping connections. If gas leakage is discovered in step (3) above, take the 2. Open the valve stem of the 2-way valve following measures. counterclockwise approximately 90’, wait 10 If the leaks stop when the piping connections are seconds, and then set it to closed position. tightened further, continue working from step (4).
7.5 Pumping down (Re-installation) 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. Operate the unit for 10 to 15 minutes. 3. Stop operation and wait for 3 minutes, then connect the charge set to the service port of the 3-way valve. Connect the charge hose with the push pin to the gas service port. 5.
7.6 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. Air purging. Open the valves on the charging cylinder and the charge set. Purge the air by loosening the flare nut on the 2-way valve approximately 45’ for 3 seconds then closing it for 1 minute; repeat 3 times.
7.7 Balance refrigerant of the 2-way, 3-way valves Procedure: 1. Confirm that both the 2-way and 3-way valves are set to the open position. 2. Connect the charge set to the 3-way valve’s service port. Leave the valve on the charge set closed. Connect the charge hose with the push pin to the service port. 3. Open the valves (Low side) on the charge set and discharge the refrigerant until the gauge indicates 0.05 to 0.1Mpa.
7.8 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). 4. Disconnect the charge hose from the vacuum pump.
7.9 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. 2. Purge the air from the charge hose. Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air (be careful of the liquid refrigerant). 3. Open the valves (Low side) on the charge set and charge the system with liquid refrigerant.
8. Operation characteristics Piping Length Characteristics (Cooling) Cooling Characteristics 5.3 Cooling Capacity (KW) 5.2 5.1 5.0 4.9 4.8 5.2 5.1 5.0 4.9 4.8 4.7 4.7 4.6 4.6 1.68 1.58 Cooling Power Input (KW) Cooling Power Input (KW) Cooling Capacity (KW) 5.3 1.64 1.60 1.56 1.52 1.48 1.44 25 27 29 31 33 1.56 1.54 1.52 1.50 1.48 1.
9. Electronic function 9.1 Abbreviation T1: Indoor ambient temperature T2: Pipe temperature of indoor heat exchanger T3: Pipe temperature of outdoor heat exchanger T4: Outdoor ambient temperature 9.2 Display function Icon explanation on indoor display board. This indicator flashes after power is on and illuminates when the unit is in operation. This indicator illuminates when the air conditioner is in AUTO operation.
This indicator appears only when the compressor is in operation and indicates the current operating frequency. Usually it displays the temperature settings. When the setting temperature is being changed, this indicator will flash at 0.5Hz for 10 times. It displays the room temperature (0℃~50℃) when the air conditioner is in FAN only operation. When the unit stops operation, it returns to original factory settings. It also displays the malfunction code or protection code. 9.3 Protection 9.3.
higher than 15℃, the compressor heating cable stopping working. 9.4 Fan-Only Mode 9.4.1 Temperature setting function is disabled, and no setting temperature display. 9.4.2 In this mode, the action of louver is the same as in cooling mode. 9.4.3 The action of auto fan in fan-only mode is the same as auto fan in cooling mode with 24℃ setting temperature. ℃ high T1 – 24 3.5 3.0 medium 1.5 1.0 9.5 Cooling Mode After starting, the operation frequency of compressor submits to following rule.
Remark: MSX-18HRDN1-QC2 9.5.4 I1COOL I2COOL 9.5 A 10.5 A I3COOL 13A Rating capacity test function 1) Set the indoor unit with remote controller as: high fan, 17℃ in cooling mode, then press “TURBO” button on controller 6 times or more within 10 seconds(make sure indoor unit receives these signals), the machine will turn into rating capacity test mode, the buzzer will make a “di” sound for 2 seconds continuously.
9.7 9.7.1 Heating mode Indoor fan action: 1) Anti-cold-wind function. ℃ 44 setting fan speed Evaporator temp 38 37 low fan 34 33 breeze 24 super breeze 17 fan stop 2) If the compressor stops caused by room temperature rising, indoor fan will be forced to run 127 seconds with breeze. During this period, anti-cold-wind is disabled. After this, anti-cold –wind function is available.
9.7.4 Outdoor unit current control in heating mode. comp. pause outdoor unit current I3HEAT freq. descends if curr. rises; I2HEAT freq. remains if curr. descends I1HEAT running normally Remark: MSX-18HRDN1-QC2 9.7.5 I1HEAT I2 HEAT 9.5 A 10.5A I3 HEAT 13A Indoor heat exchanger high temperature protection. If T2＞60℃, the compressor will stop and not resume until T2＜48℃. 9.7.6 Defrosting mode. 1) Condition of defrosting.
9.7.7 Defrosting action. F8 on compressor off on 4-way valve off on outdoor fan indoor fan off on off indoor fan breeze 10s 60s 70s no longer than 10 minutes 9.7.8 30s Rating capacity test function.
9.8.4 If the setting temperature is modified, the machine will rechoose running function. 9.9 9.9.1 Forced operation function Forced cooling and auto function can carry out with a touch button. In these two modes, the machine can be changed by remote controller to any other mode at any moment. 9.9.2 When the machine is off, pressing the touch button will carry the machine to forced auto mode, after this, if pressing the button once again within 5 seconds, the machine will turn into forced cooling mode.
9.13 9.13.1 Sleep function mode Operation time in sleep mode is 7 hours. After 7 hours the machine quits this mode and turns off. 9.13.2 In cooling, heating or auto mode sleep function is available. 9.13.3 Operation process in sleep mode is as follow: 1) After pressing ECONOMIC or SLEEP button on controller, the machine will turn into sleep mode. 2) When cooling, the setting temperature rises 1℃(be lower than 30℃) every one hour, 2 hour later the rising stops and indoor fan is fixed as low speed.
which sent from remote controller every 3 minutes, the buzzer will not respond. When the unit is running with follow me function, the PCB will control the unit according to the temperature from follow me signal, and the temperature collection function of room temperature sensor will be shielded, but the error detective function of room temperature sensor will be still valid.
10. Troubleshooting Safety Because of there are capacitors in PCB and relative circuit in outdoor unit, even shut down the power supply, electricity power still are kept in capacitors, do not forget to discharge the electricity power in capacitor.
10.1 Indoor Unit Error Display Display LED STATUS E0 EEPROM parameter error E1 Indoor / outdoor units communication protection E2 Zero-crossing signal error E3 Fan speed out of control E5 Open or short circuit of outdoor temperature sensor E6 Open or short circuit of room or evaporator temperature sensor P0 IGBT over-strong current protection P1 Over voltage or too low voltage protection P2 Temperature protection of compressor top.
10.2 10.2.1 Diagnosis and Solution E0(EEPROM parameter error) error diagnosis and solution Circuit or software error on indoor PCB 10.2.2 Replace indoor PCB E1(indoor / outdoor units communication protection) error diagnosis and solution Disconnect the power supply, after 1 minute, connect the power supply, turn on the unit with remote controller Does the unit work normally? NO Check the wiring between indoor and outdoor unit.
10.2.4 E3(indoor fan speed out of control) diagnosis and solution Is the indoor fan motor connector and connection good? NO Repair the connector and reconnect YES Indoor PCB is defective. Replace the indoor PCB. YES Is voltage being applied to the fan motor? (rang 90v-160v between mid pin and N on CN1 NO Replace the indoor fan motor 10.2.5 E5(Open or short circuit of outdoor temperature sensor) diagnosis and solution.
10.2.8 P1(over voltage or too low voltage protection) diagnosis and solution. Is the power supply good? NO Be sure the power supply is normal when using the units YES Replace the outdoor e-box. 10.2.9 P2(temperature protection of compressor top) diagnosis and solution. NO Does compressor operate? YES Is the connection good? NO Reconnect and retest. YES Is refrigerant circulation volume normal? NO Is protector normal? Replace the protector. YES NO Check the outdoor main PCB.
10.3 10.3.1. Key parts checking. Compressor checking (Model: C-6RVN93H0N). Measure the resistance value of each winding by using the multi-meter. Position Resistance Value Blue - Red 0.668Ω Blue - Black (25℃) Red - Blue 10.3.2 Outdoor Fan Motor (Model: YDK53-6F). Measure the resistance value of each winding by using the multi-meter. Position Resistance Value Black - Red 87.8Ω Red -Yellow 141.5Ω (20℃) (20℃) 10.3.3 Indoor Fan Motor (Model: RPG28D).
10.3.4 Temperature Sensors. Room temp.(T1) sensor, Indoor coil temp.(T2) sensor, Outdoor coil temp.(T3) sensor, Outdoor ambient temp.(T4) sensor, Compressor exhaust temp.(Te) sensor. Measure the resistance value of each winding by using the multi-meter. Some frequently-used R-T data for T1, T2, T3 and T4 sensor: Temperature (℃) 5 10 15 20 25 30 40 50 60 Resistance Value (KΩ) 26.9 20.7 16.1 12.6 10 8 5.2 3.5 2.4 90 100 5 3.
