COMFORT-AIRE A-DVC24SF-1 Service Manual
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COMFORT-AIRE A-DVC24SF-1 Service Manual

Century dvc series inverter single zone ductless mini-split
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Summary of Contents for COMFORT-AIRE A-DVC24SF-1

  • Page 1 Service Manual DVC Series Inverter Single Zone Ductless Mini-Split A-DVC09SF-0 B-DVC09SF-0 A-DVC12SF-0 B-DVC12SF-0 A-DVC18SF-1 B-DVC18SF-1 A-DVC24SF-1 B-DVC24SF-1 www.marsdelivers.com...

  • Page 2: Table Of Contents

    Service Manual - DVC 09/12/18/24 SF Series CONTENTS 1. Precaution ..............................3 1.1 Safety Precaution .......................... 3 1.2 Warning ............................3 2. Model List ..............................6 3. Dimensions ..............................7 3.1 Indoor Unit ............................. 7 3.2 Outdoor Unit ..........................10 4.

  • Page 3: Precaution

    Service Manual - DVC 09/12/18/24 SF Series installing the product. Sharp edges could cause injury, be especially 1. Precaution careful of the case edges and the fins on the condenser and evaporator. 1.1 Safety Precaution For installation, always contact the ...
  • Page 4 Service Manual - DVC 09/12/18/24 SF Series from product, turn the breaker off or water is drained away properly. disconnect the power supply cable. A bad connection may cause water leakage. Keep level even when installing the There is risk of electric shock or fire. ...
  • Page 5 Service Manual - DVC 09/12/18/24 SF Series through air inlet or outlet while the product is operated. Do not drink the water drained from  the product. Use a firm stool or ladder when  cleaning or maintaining the product. Be careful and avoid personal injury.

  • Page 6: A-Dvc09Sf

    Service Manual - DVC 09/12/18/24 SF Series 2. Model List Model Names of Indoor/Outdoor Units Capacity Indoor units Outdoor units B-DVC09SF-0 A-DVC09SF-0 Inverter B-DVC12SF-0 A-DVC12SF-0 B-DVC18SF-1 A-DVC18SF-1 B-DVC24SF-1 A-DVC24SF-1...

  • Page 7: Dimensions

    Service Manual - DVC 09/12/18/24 SF Series 3. Dimensions 3.1 Indoor Unit Model B-DVC09SF-0 722 (28.43") 187 (7.36") 290 (11.42") B-DVC12SF-0 802 (31.57") 189 (7.44") 297 (11.69") B-DVC18SF-1 965 (37.99") 215 (8.46") 319 (12.56") 1080 (42.52") 226 (8.9") 335 (13.19") B-DVC24SF-1...
  • Page 8 Service Manual - DVC 09/12/18/24 SF Series For B-DVC09SF-0 For B-DVC12SF-0 For B-DVC18SF-1...
  • Page 9 Service Manual - DVC 09/12/18/24 SF Series For B-DVC24SF-1...

  • Page 10: Outdoor Unit

    Service Manual - DVC 09/12/18/24 SF Series 3.2 Outdoor Unit More than 30cm/11.81" More than 60cm/23.62" (Service space) More than 30cm/11.81" More than 60cm/23.62" More than 200cm/78.74"...
  • Page 11 Service Manual - DVC 09/12/18/24 SF Series For A-DVC09SF-0, A-DVC12SF-0 779/30.67" W3 487/19.17" W1 300/11.81" D 770/80.31" W 70/2.76" W2 25/.98" B1 61.5/2.42" A2 12/.47" A1...
  • Page 12 Service Manual - DVC 09/12/18/24 SF Series For A-DVC18SF-1 815/32.09" W3 514/20.24" W1 333/13.11" D 800/31.5" W 70/2.76" W2 62/2.44" B1 D2 D3 20/.79" A1 61.6/2.43" A2...
  • Page 13 Service Manual - DVC 09/12/18/24 SF Series For A-DVC24SF-1...

  • Page 14: Refrigerant Cycle Diagram

    Service Manual - DVC 09/12/18/24 SF Series 4. Refrigerant Cycle Diagram...

  • Page 15: Installation Details

    Service Manual - DVC 09/12/18/24 SF Series 5. Installation Details 5.1 Wrench torque sheet for installation Outside diameter Torque Additional tightening torque inch N.cm N.cm Ф6.35 1500(153kgf.cm) 1600(163kgf.cm) Ф9.52 2500(255kgf.cm) 2600(265kgf.cm) Ф12.7 3500(357kgf.cm) 3600(367kgf.cm) Ф15.9 4500(459kgf.cm) 4700(479kgf.cm) Ф19 6500(663kgf.cm) 6700(683kgf.cm) 5.2 Connecting the cables The power cord of connect should be selected according to the following specifications sheet.

  • Page 16: Pipe Length And The Elevation

    Service Manual - DVC 09/12/18/24 SF Series 5.3 Pipe length and the elevation The pipe length and refrigerant amount: Standard Max. Max. Additional Pipe size Model Length Elevation Length Refrigerant Liquid B (m) A (m) (g/m) 3/8’’ 1/4’’ DVC09SF-0 25 ft 32 ft 82 ft .16 oz/ft...

  • Page 17: Installation For The First Time

    Service Manual - DVC 09/12/18/24 SF Series 5.4 Installation for the first time 3) Connect the charge hose of high pressure handle connection to the vacuum pump. Air and moisture in the refrigerant system have 4) Fully open the low pressure handle of the undesirable effects as below: manifold valve.

  • Page 18: Re-Installation After Indoor Unit Repairs

    Service Manual - DVC 09/12/18/24 SF Series Procedure: Procedure 1). Connect the charge hose to the 3-way service 1). Confirm that both the 2-way and 3-way valves port, open the 2-way valve and the 3-way valve. are set to the opened position Connect the charge hose to the valve at the Remove the valve stem caps and confirm that the bottom of the cylinder.
  • Page 19 Service Manual - DVC 09/12/18/24 SF Series 4). Open the valves (Low side) on the charge set Procedure: and charge the system with liquid refrigerant 1). Confirm that both the 2-way and 3-way If the system cannot be charged with the valves are set to the opened position.

  • Page 20: Operation Characteristics

    Service Manual - DVC 09/12/18/24 SF Series 6. Operation Characteristics Mode Cooling operation Heating operation Drying operation Temperature Room temperature 17℃~32℃ 0℃~30℃ 10℃~32℃ (62℉~90℉) (32℉~86℉) (50℉~90℉) Outdoor temperature 0℃~50℃ -15℃~30℃ 0℃~50℃ (32℉~122℉) (5℉~86℉) (32℉~122℉) -15℃~50℃ (5℉~122℉) (For the models with low temperature cooling system) CAUTION: 1.

  • Page 21: Electronic Function

    Service Manual - DVC 09/12/18/24 SF Series 7. Electronic function Displays ‘ ’ during self clean operation (if applicable). 7.1 Abbreviation Displays ‘ ’ ' under 8℃ heating operation (if T1: Indoor room temperature applicable). T2: Coil temperature of evaporator When ECO function (optional) is activated, the T3: Coil temperature of condenser “...

  • Page 22: Main Protection

    Service Manual - DVC 09/12/18/24 SF Series 7.3 Main Protection 7.3.9 Refrigerant leakage detection 7.3.1 Three minutes delay at restart for This function is only active in cooling mode. It compressor can better prevent the compressor being 1 minute delay for the 1 time start-up and 3 damaged by refrigerant leakage or compressor minutes delay for others.
  • Page 23 Service Manual - DVC 09/12/18/24 SF Series The auto fan acts as below rules: When the AC run in mute mode, the compressor will run with low frequency. T1-TS When the current is more than setting value, the current protection function will be activated, and the compressor will stop.
  • Page 24 Service Manual - DVC 09/12/18/24 SF Series speed setting, sleeping mode setting, follow me 7.4.2.4 Condenser temperature protection setting, it will quit the forced operation. 7.4.7 Timer function 7.4.7.1 Timing range is 24 hours. 7.4.7.2 Timer on. The machine will turn on Decrease automatically when reaching the setting time.
  • Page 25 Service Manual - DVC 09/12/18/24 SF Series 7.4.12 Follow me (optional) 7.4.9 Auto-Restart function The indoor unit is equipped with auto-restart If the indoor PCB receives the signal which function, which is carried out through an results from pressing the FOLLOW ME button auto-restart module.
  • Page 26 Service Manual - DVC 09/12/18/24 SF Series 7.4.14 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 27 Service Manual - DVC 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 -19—99 -19—99 2. All the temperature is °C no matter what Frequency, kind of remote controller is used. A0,A1,…A9 100,101,…109 Actual...

  • Page 28: Troubleshooting

    Service Manual - DVC 09/12/18/24 SF Series 8. Troubleshooting Safety Electricity is still kept in capacitors even the power supply is shut off. Do not forget to discharge the electricity 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 29: Indoor Unit Error Display

    Service Manual - DVC 09/12/18/24 SF Series 8.1 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 ☆ 3 times Zero-crossing signal detection error ☆...
  • Page 30 Service Manual - DVC 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 31: Diagnosis And Solution

    Service Manual - DVC 09/12/18/24 SF Series 8.2 Diagnosis and Solution 8.2.1 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. Possible causes Installation error ●...
  • Page 32 Service Manual - DVC 09/12/18/24 SF Series 8.2.2 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 33 Service Manual - DVC 09/12/18/24 SF Series Remark: Use a multimeter to test the DC voltage between terminal L2 and terminal 3(S) of outdoor unit. The red pin of multimeter connects with 2 port while the black pin is for terminal 3(S). When AC is normal running, the voltage will move alternately between -25V to 25V.
  • Page 34 Service Manual - DVC 09/12/18/24 SF Series 8.2.3 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 35 Service Manual - DVC 09/12/18/24 SF Series 8.2.4 Fan speed has been out of control diagnosis and solution (E3) E3/F5 Error Code Malfunction conditions When indoor fan speed stays too low (300RPM) for certain time, the unit will stop and the LED will display the failure. Possible causes Wiring error ●...
  • Page 36 Service Manual - DVC 09/12/18/24 SF Series Index 1: 1: Indoor or Outdoor DC Fan Motor(control chip is in fan motor) Power on and when the unit is in standby, measure the voltage of pin1-pin3, pin4-pin3 in fan motor connector. If the value of the voltage is not in the range showing in below table, the PCB needs to be replaced.
  • Page 37 Service Manual - DVC 09/12/18/24 SF Series 8.2.5 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. Possible causes Wiring error ●...
  • Page 38 Service Manual - DVC 09/12/18/24 SF Series 8.2.6 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 °...
  • Page 39 Service Manual - DVC 09/12/18/24 SF Series 8.2.7 Overload current protection diagnosis and solution (F0) Error Code Malfunction conditions An abnormal current rise is detected by checking the specified current detection circuit. Possible causes Power supply problems ● System blockage ●...
  • Page 40 Service Manual - DVC 09/12/18/24 SF Series 8.2.8 IPM malfunction or IGBT over-strong current protection diagnosis and solution (P0) Error Code Malfunction conditions When the voltage signal that IPM sends to compressor drive chip is abnormal, the display LED will show “P0” and AC will turn off. Possible causes Wiring error ●...
  • Page 41 Service Manual - DVC 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 42 Service Manual - DVC 09/12/18/24 SF Series...
  • Page 43 Service Manual - DVC 09/12/18/24 SF Series...
  • Page 44 Service Manual - DVC 09/12/18/24 SF Series 8.2.9 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. Possible causes Power supply problems.
  • Page 45 Service Manual - DVC 09/12/18/24 SF Series 8.2.10 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 46 Service Manual - DVC 09/12/18/24 SF Series 8.2.11 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 47 Service Manual - DVC 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 48 Service Manual - DVC 09/12/18/24 SF Series 8.2.12 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 resume to normal, the protection code will disappear.
  • Page 49 Service Manual - DVC 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 50 Service Manual - DVC 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 0.62973 108.146 12.0561 2.27249 0.61148 101.517 11.5...
  • Page 51 Service Manual - DVC 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 3.702 511.9 65.62 13.11 3.595 62.73...
  • Page 52 Service Manual - DVC 09/12/18/24 SF Series Appendix 3: °C °F °C °F °C °F °C °F °C °F 68.8 123.8 178.6 235.4 24.8 71.6 125.6 181.4 237.2 26.6 73.4 127.4 183.2 28.4 75.2 128.2 240.8 30.2 186.8 242.6 25.5 77.9 132.8 188.6...
  • Page 53 Service Manual - DVC 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 >200VDC >310VDC >370VDC >450VDC...
  • Page 54 Service Manual - DVC 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 1.57Ω 1.75 Ω 0.75 Ω Blue - Black Red - Blue...
  • Page 55 Service Manual - DVC 09/12/18/24 SF Series This page intentionally left blank.
  • Page 56 1900 Wellworth Ave., Jackson, MI 49203 • Ph. 517-787-2100 • www.marsdelivers.com 03/2017...

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