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Classic Air Conditioners MWNC09S Service Manual

Comfort series
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Revision A: 1403100001, Content updated. 
Model Numbers: 
MWNC09S/MRNC09AS, MWHNC09S/MRHNC09AS, MWHNC09SA/MRHNC09ASA 
MWNC12S/MRNC12AS, MWHNC12S/MRHNC12AS, MWHNC12SA/MRHNC12ASA 
MWNC18S/MRNC18AS, MWHNC18S/MRHNC18AS, 
MWNC24S/MRNC24AS, MWHNC24S/MRHNC24AS 

Table of Contents

1.
2.
3.
Specification
4.
5.
6.
7.
8.
9.
11. Disassembly Instructions
WARNING
Installation MUST conform with local building codes or, in the absence of local codes, with the
National Electrical Code NFPA70/ANSI C1-1993 or current edition and Canadian Electrical
Code Part1 CSA C.22.1.
The information contained in the manual is intended for use by a qualified service technician
familiar with safety procedures and equipped with the proper tools and test instruments
Installation or repairs made by unqualified persons can result in hazards to you and others.
Failure to carefully read and follow all instructions in this manual can result in equipment
malfunction, property damage, personal injury and/or death.
This service is only for service engineer to use.
COMFORT SERIES DC INVERTER AIR
CONDITIONER
SERVICE MANUAL
Mono DC

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Summary of Contents for Classic Air Conditioners MWNC09S

  • Page 1: Table Of Contents

    COMFORT SERIES DC INVERTER AIR CONDITIONER Mono DC SERVICE MANUAL Revision A: 1403100001, Content updated.  Model Numbers:  MWNC09S/MRNC09AS, MWHNC09S/MRHNC09AS, MWHNC09SA/MRHNC09ASA  MWNC12S/MRNC12AS, MWHNC12S/MRHNC12AS, MWHNC12SA/MRHNC12ASA  MWNC18S/MRNC18AS, MWHNC18S/MRHNC18AS,  MWNC24S/MRNC24AS, MWHNC24S/MRHNC24AS  Table of Contents Precaution Part Names And Functions Specification Dimension Refrigerant Cycle Diagram Wiring Diagram Installation Details Operation Characteristics Electronic Function 10. Troubleshooting 11. Disassembly Instructions WARNING ...
  • Page 2 CONTENTS 1. Precaution ..............................1   1.1 Safety Precaution ........................1  1.2 Warning ............................1  2. Part Names And Functions ........................4   2.1 Model Names of Indoor/Outdoor units ..................4  2.2 Part names of Indoor/Outdoor units .................... 5  2.3 Functions of Indoor/Outdoor units ....................6  3.

  • Page 3: Precaution

    Sharp edges could cause injury, be especially careful of the case edges and the fins on the 1. Precaution condenser and evaporator.  For installation, always contact the 1.1 Safety Precaution dealer or an authorized service center.  To prevent injury to the user or other ...
  • Page 4 There is risk of electric shock or fire. product.  Stop operation and close the window It can avoid vibration of water leakage. in storm or hurricane. If possible, remove  Do not install the product where the the product from the window before the noise or hot air from the outdoor unit could hurricane arrives.
  • Page 5  Use a firm stool or ladder when cleaning or maintaining the product. Be careful and avoid personal injury.  Replace the all batteries in the remote control with new ones of the same type. Do not mix old and new batteries or different types of batteries.

  • Page 6: Part Names And Functions

    2. Part Names And Functions 2.1 Model Names of Indoor/Outdoor units Series Capacity Indoor units Outdoor units MWNC09S MRNC09AS MWHNC09SA MRHNC09ASA MWHNC09S MRHNC09AS MWNC12S MRNC12AS MWHNC12SA MRHNC12ASA Comfort MWHNC12S MRHNC12AS MWNC18S MRNC18AS MWHNC18S MRHNC18AS MWNC24S MRNC24AS MWHNC24S MRHNC24AS...

  • Page 7: Part Names Of Indoor/Outdoor Units

    2.2 Part names of Indoor/Outdoor units...

  • Page 8: Functions Of Indoor/Outdoor Units

    2.3 Functions of Indoor/Outdoor units Filter Cold Catalyst Filter Ionizer(O) Louver Position Memory Function Silver Ion Filter Vitamin C Filter(O) Refrigerant Leakage Detect 8 Degree Heating(O) 3M HAF Filter(O) Heat Compensation(O) Bio Filter(O) Self-diag. Function Golden Fin(O) PTC Heating Belt(O) Self Clean(O) Compressor Crankcase Heater Follow Me(O)
  • Page 9  Cold Catalyst Filter: Eliminate formaldehyde and other volatile organic compounds as well as harmful gases and odors.  Ionizer: Release negative ions, eliminate odor, dust, smoke and pollen particles to give you fresh and healthy air.  Silver Ion Filter: Sterilize bacteria effectively by decomposing cell wall of bacteria.

  • Page 10: Dimension

    3. Dimension 3.1 Indoor Unit Model MWHNC09S (26.8in) (7.0in) (10.0in) MWNC09S MWHNC12S 770mm 188mm 255mm (30.3in) (7.4in) (10.0in) MWNC12S MWHNC18S 905mm 198mm 275mm (35.6in) (7.8in) (10.8in) MWNC18S MWHNC24S 1030mm 218mm 315mm (40.6in) (8.6in) (12.4in) MWNC24S...

  • Page 11: Outdoor Unit

    Model R(mm) L(mm) H(mm) Dimension of installation hole(mm) MWHNC09S 92mm MWNC09S (3.6in) (6.7in) (1.8in) MWHNC12S 95mm 170mm 45mm Φ65mm(2.56in) MWNC12S (3.7in) (6.7in) (1.8in) MWHNC18S 80mm 100mm 45mm (3.1in) (3.9in) (1.8in) MWNC18S Model R(mm) L(mm) H(mm) Dimension of installation hole(mm) MWHNC24S...
  • Page 12 MWHNC09S/MRHNC09AS (27.6in) (9.4in) (21.3in) (29.8in) (18.0in) (9.8in) 660mm 265mm 540mm 732mm 458mm 276mm MWHNC09SA/MRHNC09ASA (26.0in) (10.4in) (21.3in) (28.8in) (18.0in) (10.9in) MWNC09S/MRNC09AS (27.6in) (9.4in) (21.3in) (29.8in) (18.0in) (9.8in) 660mm 265mm 540mm 732mm 458mm 276mm MWHNC12SA/MRHNC12ASA (26.0in) (10.4in) (21.3in) (28.8in) (18.0in) (10.9in) MWNC12S/MRNC12AS (30.7in)
  • Page 13 MWHNC12S/MRHNC12AS (30.7in) (9.8in) (21.3in) (33.2in) (21.6in) (10.9in) 760mm 285mm 590mm 823mm 530mm 290mm MWNC18S/MRNC18AS (29.9in) (11.2in) (23.2in) (32.4in) (20.9in) (11.4in) 760mm 285mm 590mm 823mm 530mm 290mm MWHNC18S/MRHNC18AS (29.9in) (11.2in) (23.2in) (32.4in) (20.9in) (11.4in) 845mm 320mm 700mm 908mm 560mm 335mm MWNC24S/MRNC24AS (33.3in) (12.6in) (27.6in)

  • Page 14: Refrigerant Cycle Diagram

    5. Refrigerant Cycle Diagram For cooling only models: INDOOR OUTDOOR LIQUID SIDE CAPILIARY TUBE HEAT HEAT EXCHANGE EXCHANGE (EVAPORATOR) (CONDENSER) GAS SIDE COMPRESSOR...
  • Page 15 For heat pump models: INDOOR OUTDOOR CHECK VALVE LIQUID SIDE (Heating Model only) 2-WAY VALVE CAPILIARY TUBE HEAT HEAT EXCHANGE EXCHANGE (EVAPORATOR) (CONDENSER) GAS SIDE REVERSING VALVE 3-WAY VALVE (Heating Model only) ACCUMULATOR COOLING COMPRESSOR HEATING...

  • Page 16: Wiring Diagram

    6. Wiring Diagram 6.1 Indoor Unit MWNC09S, MWHNC09S, MWNC12S, MWHNC12S MWNC09SA, MWHNC09SA, MWNC12SA, MWHNC12SA MWNC18S, MWHNC18S...
  • Page 17 MWNC24S, MWHNC24S...

  • Page 18: Outdoor Unit

    6.2 Outdoor Unit MRNC09AS , MRNC12AS, MRHNC12AS MRNC09ASA, MRHNC09ASA, MRNC12ASA, MRHNC12ASA...
  • Page 19 MRNC18AS, MRHNC18AS MRNC24AS, MRHNC24AS...
  • Page 20 For MWHNC09S/MRHNC09AS,MWNC09S/MRNC09AS, MWNC12S/MRNC12AS ,MWHNC12S/MRHNC12AS : For MWNC09SA/MRNC09ASA , MWHNC09SA/MRHNC09ASA , MWNC12SA/MRNC12ASA , MWHNC12SA/MRHNC12ASA:...
  • Page 21 For MWNC18S/MRNC18AS, MWHNC18S/MRHNC18AS: For MWNC24S/MRNC24AS, MWHNC24S/MRHNC24AS:...

  • Page 22: Installation Details

    3/8in 2500N.cm(255kgf.cm) 2600N.cm(265kgf.cm) 3/8in 1/4in MWHNC09S/MRHNC09AS Ф12.7mm 1/2in 3500N.cm(357kgf.cm) 3600N.cm(367kgf.cm) (Ф9.52mm) (Ф6.35mm) 3/8in 1/4in Ф15.9mm 5/8in 4500N.cm(459kgf.cm) 4700N.cm(479kgf.cm) MWNC09S/MRNC09AS (Ф9.52mm) (Ф6.35mm) Ф19mm 3/4in 6500N.cm(663kgf.cm) 6700N.cm(683kgf.cm) 3/8in 1/4in MWNC09SA/MRNC09ASA (Ф9.52mm) (Ф6.35mm) 3/8in 1/4in MWHNC09SA/MRHNC09ASA (Ф9.52mm) (Ф6.35mm) 7.2 Connecting the cables 1/2in...
  • Page 23 Max. Max. Standard Additional Models Elevatio Length length refrigerant 7.5m 15g/m MWHNC09S/MRHNC09AS (24.6ft) (32.8ft) (82.0ft) (0.53oz/3.3ft) 7.5m 15g/m MWNC09S/MRNC09AS (24.6ft) (32.8ft) (82.0ft) (0.53oz/3.3ft) 7.5m 15g/m MWNC09SA/MRNC09ASA (24.6ft) (32.8ft) (82.0ft) (0.53oz/3.3ft) 7.5m 15g/m MWHNC09SA/MRHNC09ASA (24.6ft) (32.8ft) (82.0ft) (0.53oz/3.3ft) 7.5m 15g/m MWNC12SA/MRNC12ASA (24.6ft)

  • Page 24: Installation For The First Time

    4) Fully open the handle Lo of the manifold valve. 7.4 Installation for the first time 5) Operate the vacuum pump to evacuate. Air and moisture in the refrigerant system have 6) Make evacuation for 30 minutes and check whether the compound meter indicates undesirable effects as below: -0.1Mpa(14.5Psi).

  • Page 25: Adding The Refrigerant After Running The System For Many Years

    for 3 seconds then closing it for 1 minute; repeat purge the air (be careful of the liquid 3 times. refrigerant). After purging the air, use a torque wrench to 3) Put the charging cylinder onto the electronic tighten the flare nut on the 2-way valve. scale and record the weight.

  • Page 26: Re-Installation While The Outdoor Unit Need To Be Repaired

    slightly to purge air from the charge hose for 5 the gauge indicates 0.3Mpa(43.5Psi) to 0.5 seconds and then close it quickly. Mpa(72.5Psi). 4). Set the 2-way valve to the close position. 6). Disconnect the charge set and the charging 5).
  • Page 27 2. Refrigerant charging to check for gas leakage. Procedure: 1). Connect the charge hose to the charging cylinder, open the 2-way valve and the 3-way valve 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.

  • Page 28: Operation Characteristics

    8. Operation Characteristics Temperature Cooling operation Heating operation Drying operation Mode ＞10℃ ≥17℃ ≤30℃ Room temperature (62℉) (86℉) (50℉) 0℃～50℃ (32℉～122℉) -15℃～30℃ 0℃～50℃ -15℃～50℃ Outdoor temperature (5℉～86℉) (32℉～122℉) (5℉～122℉) (For the models with low temperature cooling system) CAUTION: 1. If the air conditioner is used beyond the above conditions, certain safety protection features may come into operation and cause the unit to operate abnormally.

  • Page 29: Electronic Function

    9. Electronic Function 9.1 Abbreviation T1: Indoor room temperature T2: Coil temperature of evaporator T3: Coil temperature of condenser T4: Outdoor ambient temperature T5: Compressor discharge temperature 9.2 Display function 9.2.1 Icon explanation on indoor display board. This indicator illuminates when the Defrost air conditioner starts defrosting Indicator...

  • Page 30: Main Protection

    9.3 Main Protection Preheating mode: A weak current flow through the coil of 9.3.1 Three minutes delay at restart for compressor from the wiring terminal of the compressor compressor, then the compressor is heated 1 minute delay for the 1 time stand-up and 3 without operation.

  • Page 31: Operation Modes And Functions

    9.4 Operation Modes and Functions If users switch on AC by remote controller, the compressor will run at the Fmax frequency for 7 9.4.1 Fan mode minutes according to the outdoor ambient temp. (1) Outdoor fan and compressor stop. During the 7 minutes, the frequency limitation is (2) Temperature setting function is disabled, active.
  • Page 32 When AC is in “hold” zone for 3 minutes, the following rule. compressor frequency will rise to the higher level.(frequency will increase twice at most) 9.4.2.2 Outdoor fan running rules MWNC09S/MRNC09AS model: Fmax=F2 High 28¡ã C (82.4¡ã F ) Fmax=F3 26¡ã...
  • Page 33 +1.0 level. (The frequency will increase twice at most) +0.5 9.4.3.2 Outdoor fan running rules MWNC09S/MRNC09AS model: While the zones of A,B,C... are corresponding to different compressor running frequency. ΔT=0℃ as default. Note: 17¡ã C (62.6¡ã F ) When T1-Ts keeps in the same temp.
  • Page 34 defrosting will finish and the machine will turn to 9.4.3.3 Indoor fan running rules normal heating mode. If the compressor stops caused by the room ----T3 rises to be higher than TCDE1℃. temperature rising, the indoor fan will be forced ----T3 keeps to be higher than TCDE2℃...
  • Page 35 MWNC09S/MRNC09AS model: When the frequency decreases to F2 （F1 for Condition of defrosting: MWNC09S/MRNC09AS） and the T2 is still over If any one of the following items is satisfied, AC TEH2℃ for 3 minutes, the compressor will will enter the defrosting mode.
  • Page 36 9.4.7.1 Timing range is 24 hours. 9.4.7.2 Timer on. The machine will turn on automatically when reaching the setting time. 9.4.7.3 Timer off. The machine will turn off automatically when reaching the setting time. 9.4.7.4 Timer on/off. The machine will turn on automatically when reaching the setting “on”...
  • Page 37 function, which is carried out through an to start up now, the compressor will have 1 auto-restart module. In case of a sudden power minute delay when power on. Other conditions, failure, the module memorizes the setting the compressor will have 3 minutes delay when conditions before the power failure.

  • Page 38: Troubleshooting

    10. Troubleshooting Safety Electricity power is still kept in capacitors even the power supply is shut off. Do not forget to discharge the electricity power in capacitor. Electrolytic Capacitors (HIGH VOLTAGE! CAUTION!) For other models, please connect discharge resistance (approx.100Ω 40W) or soldering iron (plug) between +, - terminals of the electrolytic capacitor on the contrary side of the outdoor PCB.

  • Page 39: Indoor Unit Error Display

    10.1 Indoor Unit Error Display Operation lamp Timer lamp Display LED STATUS ☆ 1 time Indoor unit EEPROM parameter error ☆ 2 times Indoor / outdoor units communication error ☆ 3 times Zero-crossing signal detection error ☆ 4 times Indoor fan speed has been out of control Indoor room temperature sensor T1 open circuit or short ☆...

  • Page 40: Outdoor Unit Error Display

    10.2 Outdoor unit error display  MWHNC09S/MRHNC09AS, MWHNC12S/MRHNC12AS There’s a LED light on the outdoor PCB which is blue color. After power on, it will be slow flash(0.2Hz) when the unit is in standby and quick flash (2.5Hz) if the unit has some problems, it will be solid light when the unit is running.
  • Page 41  MWHNC09SA/MRHNC09ASA, MWHNC12SA/MRHNC12ASA: There’s a LED light on the outdoor PCB which is blue color. After power on, it will be slow flash(0.2Hz) when the unit is in standby and quick flash (2.5Hz) if the unit has some problems. ...
  • Page 42  MWHNC18S/MRHNC18AS: LED3 & LED4 LED2 LED1 (red) (green) (yellow) (red) standby operating LED2 slow flashing(0.2Hz) LED1 The picture of PCB above is only for reference. LED 1 is a red light and for the PCB POWER display. LED 2 is a yellow light. After power on, it will be slow flash(0.2Hz) when the unit is in standby and quick flash (2.5Hz) if the unit has some problems.
  • Page 43 LED4 LED3 Problems IU display (Green) (Red) standby for normal Operation normally IPM malfunction or IGBT over-strong current protection ☆ Over voltage or too low voltage protection Over voltage or too low voltage protection ☆ Inverter compressor drive error ☆ Inverter compressor drive error ☆...

  • Page 44: Diagnosis And Solution

    10.3 Diagnosis and Solution 10.3.1 EEPROM parameter error diagnosis and solution(E0/F4) E0/F4 Error Code Malfunction decision Indoor or outdoor PCB main chip does not receive feedback conditions from EEPROM chip. Supposed causes Installation mistake ● PCB faulty ● Trouble shooting: Shut off the power supply and turn it on 5 seconds later.
  • Page 45 10.3.2 Indoor / outdoor unit’s communication diagnosis and solution(E1) Error Code Malfunction decision Indoor unit does not receive the feedback from outdoor unit during conditions seconds and this condition happens four times continuously. Supposed causes Wiring mistake ● Indoor or outdoor PCB faulty ●...
  • Page 46 Remark: Use a multimeter to test the DC voltage between L2 port and S port of outdoor unit. The red pin of multimeter connects with L2 port while the black pin is for S port. When AC is normal running, the voltage will move alternately between -50V to 50V.
  • Page 47 10.4.3 Zero crossing detection error diagnosis and solution(E2) Error Code Malfunction decision When PCB does not receive zero crossing signal feedback for 4 conditions minutes or the zero crossing signal time interval is abnormal. Supposed causes Connection mistake ● PCB faulty ●...
  • Page 48 10.4.4 Fan speed has been out of control diagnosis and solution(E3) Error Code Malfunction decision When indoor fan speed keeps too low (300RPM) for certain time, conditions the unit will stop and the LED will display the failure. Supposed causes Wiring mistake ●...
  • Page 49 Index 1: 1.Indoor AC fan motor Measure the resistance value of each winding by using the tester. For the definite value of the resistance, refer to page61 and page64. Index2: 1: Indoor AC fan motor Power on and set the unit running in fan mode at high fan speed. After running for 15 seconds, measure the voltage of pin1 and pin2.
  • Page 50 connector. If the value is not 5V, change the PCB. Otherwise, go to step 3. 3) Rotate the fan by hand, measure the voltage of pin1-5, pin 2-5 and pin 3-5 in feedback signal connector. If any voltage is not positive voltage fluctuation, the fan motor must has problems and need to be replaced.
  • Page 51 10.4.5 Open circuit or short circuit of temperature sensor diagnosis and solution(E5) Error Code Malfunction decision If the sampling voltage is lower than 0.06V or higher than 4.94V, conditions the LED will display the failure. Supposed causes Wiring mistake ● Sensor faulty ●...
  • Page 52 10.4.6 Refrigerant Leakage Detection diagnosis and solution(EC) Error Code Malfunction decision Define the evaporator coil temp.T2 of the compressor just starts conditions running as Tcool. In the beginning 5 minutes after the compressor starts up, if T2 ＜Tcool－2℃ does not keep continuous 4 seconds and this situation happens 3 times, the display area will show “EC”...

  • Page 53: Trouble Shooting

    10.4.7 IPM malfunction or IGBT over-strong current protection diagnosis and solution(P0) Error Code Malfunction decision When the voltage signal that IPM send to compressor drive chip conditions is abnormal, the display LED will show “P0” and AC will turn off. Supposed causes Wiring mistake;...
  • Page 56 10.4.8 Over voltage or too low voltage protection diagnosis and solution(P1) Error Code Malfunction decision An abnormal voltage rise or drop is detected by checking the conditions specified voltage detection circuit. Supposed causes Power supply problems. ● System leakage or block ●...
  • Page 57 10.4.9 High temperature protection of compressor top diagnosis and solution(P2) Error Code Malfunction decision If the sampling voltage is not 5V, the LED will display the failure. conditions Supposed causes Power supply problems. ● System leakage or block ● PCB faulty ●...
  • Page 58 10.4.10 Inverter compressor drive error diagnosis and solution(P4) Error Code Malfunction decision An abnormal inverter compressor drive is detected by a special conditions detection circuit, including communication signal detection, voltage detection, compressor rotation speed signal detection and so on. Supposed causes Wiring mistake;...
  • Page 59 Main parts check 1. Temperature sensor checking Disconnect the temperature sensor from PCB, measure the resistance value with a tester. Temperature Sensors. Room temp.(T1) sensor, Indoor coil temp.(T2) sensor, Outdoor coil temp.(T3) sensor, Outdoor ambient temp.(T4) sensor, Compressor discharge temp.(T5) sensor. Measure the resistance value of each winding by using the multi-meter.
  • Page 60 Appendix 1 Temperature Sensor Resistance Value Table for T1,T2,T3,T4 (℃--K) K Ohm K Ohm K Ohm K Ohm ℃ ℉ ℃ ℉ ℃ ℉ ℃ ℉ 115.266 12.6431 2.35774 0.62973 108.146 12.0561 2.27249 0.61148 101.517 11.5 2.19073 0.59386 96.3423 10.9731 2.11241 0.57683 89.5865...
  • Page 61 A ppendix 2 Temperature Sensor Resistance Value Table for T5 (℃--K) K Ohm K Ohm K Ohm K Ohm ℃ ℉ ℃ ℉ ℃ ℉ ℃ ℉ 542.7 68.66 13.59 3.702 511.9 65.62 13.11 3.595 62.73 12.65 3.492 455.9 59.98 12.21 3.392 430.5...
  • Page 62 Appendix 3: 10 11 12 13 14 15 16 17 18 19 20 21 22 ℃ 48 50 52 54 56 58 60 62 64 66 68 70 72 ℉ 23 24 25 26 27 28 29 30 31 32 33 34 35 ℃...
  • Page 63 2.Compressor checking Measure the resistance value of each winding by using the tester. Position Resistance Value DA108X1C-23EZ DA108X1C-20FZ3 DA130M1C-31FZ DA150S1C-20FZ Blue - Red 0.71Ω 1.77Ω 0.95Ω 1.1Ω (20℃/68℉) (20℃/68℉) (20℃/68℉) Blue - Black (20℃/68℉) Red - Blue...
  • Page 64 3. IPM continuity check Turn off the power, let the large capacity electrolytic capacitors discharge completely, and dismount the IPM. Use a digital tester to measure the resistance between P and UVWN; UVW and N. Digital tester Normal resistance value Digital tester Normal resistance value (+)Red...
  • Page 65 5: Pressure On Service Port Cooling chart: ℉(℃) （23.89） （29.44） （35） （40.56） （46.11） 70/59 10.1 75/63 10.7 80/67 11.2 75 （23.89） 85 （29.44） 105 （40.56） 115 （46.11） ℉(℃) （35） 70/59 75/63 80/67 75 （23.89） 85 （29.44） 105 （40.56） 115 （46.11） ℉(℃) （35）...
  • Page 66 Heating Chart: 57/53 47/43 37/33 27/23 17/13 ℉ (℃) (13.89/11.67) (8.33/6.11) (2.78/0.56) (-2.78/-5) (-8.33/-10.56) 30.3 28.5 25.3 22.8 20.8 32.5 30.0 26.6 25.4 23.3 33.8 31.5 27.8 26.3 24.9 57/53 47/43 37/33 27/23 17/13 ℉ (℃) (13.89/11.67) (8.33/6.11) (2.78/0.56) (-2.78/-5) (-8.33/-10.56) 57/53 47/43...

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