Mars DVH Series Service Manual
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Mars DVH Series Service Manual

Inverter single zone ductless mini-split
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Inverter Single Zone Ductless Mini-Split
A-DVH09SF-0
A-DVH12SF-0
A-DVH18SF-1
A-DVH24SF-1
Service Manual
DVH Series
www.marsdelivers.com
www.marsdelivers.com
B-DVH09SF-0
B-DVH12SF-0
B-DVH18SF-1
B-DVH24SF-1

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  • Page 1 Service Manual DVH Series Inverter Single Zone Ductless Mini-Split A-DVH09SF-0 B-DVH09SF-0 A-DVH12SF-0 B-DVH12SF-0 A-DVH18SF-1 B-DVH18SF-1 A-DVH24SF-1 B-DVH24SF-1 www.marsdelivers.com www.marsdelivers.com...

  • Page 2: Table Of Contents

    Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series CONTENTS 1.Precautions ..............................3 1.1 Safety Precaution ..........................3 1.2 Warning ............................3 2.Part Names And Functions .......................... 6 2.1 Model Names of Indoor/Outdoor units ..................6 2.2 Clearances of Indoor/Outdoor units ....................7 3.Dimensions ..............................

  • Page 3: Precautions

    Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 1. Precaution careful of the case edges and the fins on the condenser and evaporator. 1.1 Safety Precaution For installation, always contact the  dealer or an authorized service center. To prevent injury to the user or other ...
  • Page 4 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series Stop operation and close the window  Do not install the product where the  in the event of a storm or hurricane. noise or hot air from the outdoor unit could impinge on neighbors.
  • Page 5 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 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

    Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 2. Part Names And Functions 2.1 Model Names of Indoor/Outdoor units Capacity Voltage Indoor Units Outdoor Units 115V B-DVH09SF-0 A-DVH09SF-0 115V B-DVH12SF-0 B-DVH12SF-0 208-230V B-DVH18SF-1 A-DVH18SF-1 208-230V B-DVH24SF-1 A-DVH24SF-1...

  • Page 7: Clearances Of Indoor/Outdoor Units

    Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 2.2 Clearance of Indoor/Outdoor units At Least...

  • Page 8: Dimensions

    Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 3. Dimension 3.1 Indoor Unit Model WxDxH (mm) WxDxH (inch) Mounted plate B-DVH09SF-0 722x187x290 28.43x7.36x11.42 B-DVH12SF-0 802x189x297 31.57x7.44x11.69 B-DVH18SF-1 965x215x319 37.99x8.46x12.56 B-DVH24SF-1 1080x226x335 42.52x8.90x13.19...
  • Page 9 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series For Mounted plate A， For Mounted plate B， For Mounted plate C，...
  • Page 10 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series For Mounted plate D，...

  • Page 11: Outdoor Unit

    Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 3.2 Outdoor Unit More than 30cm(11.8in) More than 60cm(23.6in) (Service space) More than 30cm(11.8in) More than 60cm(23.6in) More than 70cm(27.6in) Note: The above drawing is only for reference. The appearance of your units may be different. Model A-DVH09SF-0 770(mm)

  • Page 12: Refrigerant Cycle Diagram

    Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 4. Refrigerant Cycle Diagram INDOOR OUTDOOR CHECK VALVE LIQUID SIDE (Heating Model only) 2-WAY VALVE CAPILIARY TUBE HEAT HEAT EXCHANGE EXCHANGE (EVAPORATOR) (CONDENSER) T1 Room temp. sensor T2 Evaporator temp.

  • Page 13: Wiring Diagram

    Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 5. Wiring Diagram (Please refer to the wiring diagram on the unit) 6.3 Pipe length and the elevation 6 Installation Details Pipe size 6.1 Wrench torque sheet for Models installation Liquid...

  • Page 14: Installation For The First Time

    Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 6.4 Installation for the first time 5) Operate the vacuum pump to evacuate. 6) Make evacuation for 30 minutes and check Air and moisture in the refrigerant system have whether the compound meter indicates undesirable effects as below: -0.1Mpa(14.5Psi).

  • Page 15: Re-Installation When The Indoor Unit Has Been Repaired

    Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series and press the check valve on the charge set to Open the handle Lo valve of the manifold valve purge the air (be careful of the liquid slightly to purge air from the charge hose for 5 refrigerant).

  • Page 16: Re-Installation When The Outdoor Unit Has Been Repaired

    Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series pumping 50 minutes, please check for leakage points. Fully close the handle Lo valve of the manifold valve and stop the operation of the vacuum pump. Confirm that the gauge needle does not move (approximately 5 minutes after turning off the vacuum pump).

  • Page 17: Operation Characteristics

    Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 7. Operation Characteristics Temperature Cooling operation Heating operation Drying operation Mode 17℃～32℃ 0℃～30℃ 10℃～32℃ Room temperature (62℉～90℉) (32℉～86℉) (50℉～90℉) °C °C Outdoor temperature ～50 °F °F ～122 °C °C...

  • Page 18: Electronic Functions

    Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 8. Electronic Functions Displays ‘ ’ during self clean operation (if applicable). 8.1 Abbreviations T1: Indoor room temperature Displays ‘ ’ under 8℃ heating operation (if T2: Coil temperature of evaporator applicable).

  • Page 19: Main Protection

    Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 8.3 Main Protection 8.4 Operation Modes and Functions 8.3.1 Three minutes delay at restart for 8.4.1 Fan mode ( 1) Outdoor fan and compressor stop. compressor 1 minute delay for the 1 time start-up and 3 (2) Temperature setting function is disabled,...
  • Page 20 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series TP3+5 Decrease Hold TP3-3 Resume 8.4.2.3 Indoor fan running rules In cooling mode, indoor fan runs all the time ---TP3<T3< TP3+5, the compressor frequency and the speed can be selected as high, will decrease to the lower level until to F1 and medium, low and auto.
  • Page 21 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series normal heating mode. ----T3 rises to be higher than TCDE1℃. ----T3 remains higher than TCDE2℃ for 80 seconds. ----The machine has run for 15 minutes in defrosting mode.
  • Page 22 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 8.4.5 Drying mode 8.4.8 Sleep function Indoor fan speed is fixed at breeze and can’t be 8.4.8.1 The sleep function is available in changed. The louver angle is the same as in cooling, heating or auto mode.
  • Page 23 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 8.4.11 Louver Position Memory Function signal which sent from remote controller every 3 minutes, the buzzer will not respond. When When starting the unit again after shutting down, the unit is running with follow me function, the its louver will restore to the angle originally set PCB will control the unit according to the...
  • Page 24 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 8.4.16 Point check function Press the LED DISPLAY or LED or MUTE button of the remote controller three times, and then press the AIR DIRECTION or SWING button three times in ten seconds, the buzzer will sound for two seconds.
  • Page 25 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series Enquiry Display value Meaning Remark information T1,T2,T3,T4, -1F,-1E,-1d,-1c,- -25,-24,-23,-22,-21,-2 1. All the displaying temperature is actual T2B,TP,TH, 1b,-1A value. Targeted 2. All the temperature is °C no matter what -19—99 -19—99 Frequency,...

  • Page 26: Troubleshooting

    Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 9. Troubleshooting Safety Electric power is still kept in capacitors even the power supply is shut off. Do not forget to discharge the electric power in capacitor. Electrolytic Capacitors (HIGH VOLTAGE! CAUTION!) For other models, please connect discharge resistance (approx.100Ω...

  • Page 27: Indoor Unit Error Display

    Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 9.1 Indoor Unit Error Display Operation Timer lamp Display LED STATUS lamp ☆ 1 time Indoor unit EEPROM parameter error ☆ 2 times Indoor / outdoor units communication error ☆...
  • Page 28 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series Troubleshooting: Use the remote controller. If the unit does not respond to the remote, the indoor PCB needs to be replaced; if the unit does respond, then the display board needs to be replaced.

  • Page 29: Outdoor Unit Board Components And Error Codes

    Service Manual - DVH 09/12/18/24 SF Series 9.2 Outdoor unit board components and error codes Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series For A-DVH09SF-0, A-DVH12SF-0 9.2 Outdoor unit board components and error codes For A-DVH09SF-0, A-DVH12SF-0 Name Meaning...
  • Page 30 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series For A-DVH18SF-1, A-DVH24SF-1 For A-DVH18SF-1, A-DVH24SF-1 Name Meaning Earth: connect to Ground Power Supply N_in: connect to N-line (208-230V AC input) L_in: connect to L-line (208-230V AC input) S: connect to indoor unit communication 4-WAY...
  • Page 31 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series After power on, LED3(Green color) and LED2(Red color) will be flash if the unit has some problems. LED3 LED2 Problems IU display (Green) (Red) Standby, Normal Normal operation IPM malfunction or IGBT over-strong current protection ☆...
  • Page 32 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series IPM board...

  • Page 33: Diagnosis And Solutions

    Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 9.3 Diagnosis and Solutions 9.3.1 EEPROM parameter error diagnosis and solution (E0/F4) E0/F4 Error Code Malfunction conditions Indoor or outdoor PCB main chip does not receive feedback from EEPROM chip.
  • Page 34 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 9.3.2 Indoor/outdoor unit’s communication diagnosis and solution (E1) Error Code Malfunction conditions Indoor unit does not receive the feedback from outdoor unit during 110 seconds and this condition happens four times continuously. Possible causes Wiring error ●...
  • Page 35 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series Remark: Use a multimeter to test the DC voltage between 2 port and 3 port of outdoor unit. The red pin of multimeter connects with 2 port while the black pin is for 3 port.
  • Page 36 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 9.3.3 Zero crossing detection error diagnosis and solution (E2) Error Code Malfunction conditions When PCB does not receive zero crossing signal feedback for 4 minutes or the zero crossing signal time interval is abnormal. Possible causes Connection error ●...
  • Page 37 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 9.3.4 Fan speed has been out of control diagnosis and solution (E3) E3/F5 Error Code When indoor fan speed keeps too low (300RPM) for certain time, Malfunction conditions the unit will stop and the LED will display the failure.
  • Page 38 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series Index 1: 1: Indoor or Outdoor DC Fan Motor(control chip is in fan motor) Power on. When the unit is in standby, measure the voltage of pin1-pin3, pin4-pin3 in fan motor connector.
  • Page 39 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 9.3.5 Open circuit or short circuit of temperature sensor diagnosis and solution (E5) E4/E5/F1/F2/F3 Error Code Malfunction conditions If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED will display the failure.
  • Page 40 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 9.3.6 Refrigerant Leakage Detection diagnosis and solution (EC) Error Code Malfunction conditions Define the evaporator coil temp.T2 of the compressor just starts running as Tcool. In the beginning 5 minutes after the compressor starts up, if T2 °C( °F) Tcool－35.6...
  • Page 41 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 9.3.6 Overload current protection diagnosis and solution (F0) Error Code Malfunction conditions An abnormal current rise is detected when checking the specified current detection circuit. Possible causes Power supply problems.
  • Page 42 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 9.3.7 IPM malfunction or IGBT over-strong current protection diagnosis and solution (P0) Error Code Malfunction conditions When the voltage signals that IPM sent to compressor drive chip is abnormal, the display LED will show “P0”...
  • Page 43 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series For example: Note: The photos below are only for reference, it’s may be not same totally with the ones on your side.
  • Page 44 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series...
  • Page 45 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series...
  • Page 46 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series For 30K~36K: At first test the resistance between every two ports of U, V, W of IPM and P, N. If any result of them is 0 or close to 0, the IPM is defective.
  • Page 47 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 9.3.8 Over voltage or too low voltage protection diagnosis and solution (P1) Error Code Malfunction conditions An abnormal voltage rise or drop is detected by checking the specified voltage detection circuit.
  • Page 48 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 9.3.9 High temperature protection of IPM module or compressor top diagnosis and solution (P2) Error Code Malfunction conditions If the sampling voltage is not 5V, the LED will display the failure. Possible causes Installation error ●...
  • Page 49 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 9.3.10 Inverter compressor drive error diagnosis and solution (P4) Error Code Malfunction conditions An abnormal inverter compressor drive is detected by a special detection circuit, including communication signal detection, voltage detection, compressor rotation speed signal detection and so on.
  • Page 50 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 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...
  • Page 51 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series For 30K~36K: At first test the resistance between every two ports of U, V, W of IPM and P, N. If any result of them is 0 or close to 0, the IPM is defective.
  • Page 52 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 9.3.11 Low pressure protection diagnosis and solution (P6) Error Code Malfunction conditions When the pressure of system reach a certain value, the low pressure protector will switch off. After the pressure returns to normal, the protection code will disappear.
  • Page 53 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 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.(TP) sensor.
  • Page 54 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series Appendix 1 Temperature Sensor Resistance Value Table for T1,T2,T3,T4 (°C--K) °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm 115.266 12.6431 2.35774...
  • Page 55 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series Appendix 2 Temperature Sensor Resistance Value Table for TP (°C --K) °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm 542.7 68.66 13.59...
  • Page 56 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 9ΔT(℃) ΔT(℉) = Appendix 3: °C °F °C °F °C °F °C °F °C °F 69.8 123.8 179.6 235.4 24.8 71.6 125.6 181.4 237.2 26.6 73.4 127.4 183.2 28.4...
  • Page 57 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series Appendix 4 Normal voltage of P and N 208-240V(1-phase,3-phase) 380-420V(3-phase) In standby around 310VDC around 530VDC In operation With passive PFC With partial active With fully active module PFC module PFC module...
  • Page 58 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 2.Compressor checking Measure the resistance value of each winding by using the tester. Position Resistance Value ASN98D22UFZ ASM135D23UFZ ATF235D22UMT ATF250D22UMT Blue - Red 0.75 Ω 1.75 Ω 0.75 Ω...
  • Page 59 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 4: Fan Motor Measure the resistance value of each winding by using the tester. Model YKT-32-6-202L YKT-32-6-3L YKT-48-6-206 YKT-63-6-200L Brand Tongde Welling Welling Welling Ω 88.5 Black –...
  • Page 60 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 5: Pressure On Service Port Cooling chart: °F °C (23.89) (29.44) (35) (40.56) (46.11) 70/59 10.1 75/63 10.7 80/67 11.2 °F °C (23.89) (29.44) (35) (40.56) (46.11) 70/59 75/63...
  • Page 61 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series Heating Chart: 57/53 47/43 37/33 27/23 17/13 °F (13.89/11.67) (8.33/6.11) (2.78/0.56) (-2.78/-5) (-8.33/-10.56) °C 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...

  • Page 62: Disassembly Instructions

    Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 10 Disassembly Instructions Note: This part is for reference, the photos may have slight difference with your machine. 10.1 Indoor unit Parts name Procedures Remarks Front panel How to remove the front panel.
  • Page 63 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series Electrical How to remove the electrical parts parts. ② 1) Remove the front panel from procedure 1. 2) Pull out the room temp. sensor (T1). Remove the two ③...
  • Page 64 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series Evaporator How to remove the evaporator. After removing the electrical parts from procedure 2, disassemble the pipe holder at the rear side of the unit. ② ①...
  • Page 65 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series Fan motor How to remove the fan motor. and Fan 1) Remove the front panel, electrical parts and evaporator following procedure 1-3. 2) Remove the two screws and remove the fixing board of ②...

  • Page 66: Outdoor Unit

    Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 10.2 Outdoor unit Note: This part is for reference, the photos may have slight difference with your machine. A-DVH09SF-0, A-DVH12SF-0 Part name Procedures Remarks Panel plate How to remove the panel Screws of top panel (3 screws,1 screws is under the big handle) plate.
  • Page 67 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series Fan assembly How to remove the fan ○ assembly. After removing the panel plate following procedure 1. 2) Remove the nut fixing the fan, and remove the fan.
  • Page 68 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 4) Disconnect the connector for fan motor from the electronic control board. ④ ○ 5) Remove the four fixing screws of the fan motor, then remove the motor.
  • Page 69 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series Electrical How to remove the parts electrical parts. After finishing item 1 and item 2, remove the connector for the compressor . ○ Pull out the two blue wires connected with the four way valve.
  • Page 70 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 4) Disconnect the electronic expansion valve ④ wire from the control board 5) Remove the ground ○ ○ wires . 6) Remove the wires (1,2,3). 7) Then remove the electronic control box.
  • Page 71 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series Four-way How to remove the valve The picture of four-way valve may be different from four-way valve. the one in your equipment. ④ 1)Perform item 1, 3. ○...
  • Page 72 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series A-DVH18SF-1 Part name Procedures Remarks Panel plate How to remove the panel plate. Screws of top panel (3 screws, 1 screw is under the big handle) 1) Stop operation of the air conditioner and 3 screws...
  • Page 73 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series Fan assembly How to remove the ○ fan assembly. 1) After removing the panel plate following procedure 1, remove the hex nut fixing the fan and then remove ○...
  • Page 74 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 3) Disconnect the ○ connector for fan motor from the electronic control board. ○ 4) Remove the four fixing screws of the fan motor. Then remove the fan motor.
  • Page 75 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series ○ 3) Pull out connectors of the condenser coil temp. sensor(T3),outdoor ambient temp. sensor(T4) and discharge temp. sensor(TP). 4) disconnect the ○ electronic expansion valve wire 5) Remove the grounding screw.
  • Page 76 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series Four-way How to remove the valve The picture of four-way valve may be different from four-way valve. the one on your side. ○ ○ 1) Perform item1, 3. 2) Recover refrigerant from the refrigerant circuit.
  • Page 77 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series A-DVH24SF-1 Part name Procedures Remarks Panel plate How to remove the panel plate. 1) Stop operation of 3 screws of top panel the air conditioner and turn “OFF”...
  • Page 78 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series Fan assembly How to remove the fan assembly. ○ 1) After removing the panel plate following procedure 1, remove the hex nut fixing the fan and then remove the fan.
  • Page 79 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 3) Disconnect the ○ connector for fan motor from the electronic control board. 4) Remove the four fixing ○ screws of the fan motor. Then remove the fan motor.
  • Page 80 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 2) Pull out the two blue ○ wires connected to the four way valve. ○ ○ 3) Pull out connectors of the condenser coil temp. sensor (T3), outdoor ambient temp.
  • Page 81 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series 5) remove the electric ○ heaters. 6) Remove the grounding screw. 7) Remove the Wires (1,2,3 or L1, L2, S). Then remove the electronic control box. ⑥...
  • Page 82 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series Four-way How to remove the valve The picture of four-way valve may be different from four-way valve. the one on your side. 1) Perform items 1, 3. ④...
  • Page 83 Service Manual - DVH 09/12/18/24 SF Series Service Manual - DVH 09/12/18/24 SF Series This page intentionally left blank.
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