Kaisai KFU-09HRDN1-QRC8W Service Manual
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Kaisai KFU-09HRDN1-QRC8W Service Manual

Kaisai 12f inverter series split type air conditioners
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12F INVERTER SERIES
Service Manual 2013
12FSI-A-1310

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Summary of Contents for Kaisai KFU-09HRDN1-QRC8W

  • Page 1 12F INVERTER SERIES Service Manual 2013 12FSI-A-1310...

  • Page 2: Table Of Contents

    CONTENTS 1. Precaution ..............................3 1.1 Safety Precaution .......................... 3 1.2 Warning ............................3 2. Function ................................ 7 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 Unit ...........................

  • 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 the unit, be sure to read this service manual at first. 1.2 Warning ...
  • Page 4  For installation, always contact the dealer or an authorized service center.  Do not install the product on a defective installation stand.  Be sure the installation area does not deteriorate with age. If the base collapses, the air conditioner could fall with it, causing property damage, product failure, and personal injury.
  • Page 5  Do not open the inlet grill of the product during operation. (Do not touch the electrostatic filter, if the unit is so equipped.) There is risk of physical injury, electric shock, or product failure.  When the product is soaked, contact an authorized service center. There is risk of fire or electric shock.
  • Page 6  Operational  Do not expose the skin directly to cool air for long time. (Do not sit in the draft).  Do not use the product for special purposes, such as preserving foods, works of art etc. It is a consumer air conditioner, not a precision refrigerant system. There is risk of damage or loss of property.

  • Page 7: Function

    2. Function Model Names of Indoor/Outdoor Units Capacity Indoor units Outdoor units KFU-09HRDN1-QRC8W KOB-09HFN1-QRC8W KFU-09HRDN1-QRC8GW KOB-09HFN1-QRD0GW KFU-12HRFN1-QRC8W KOB-12HFN1-QRC8W KFU-12HRDN1-QRC8GW KOB1-12HFN1-QRD0GW Inverter KFU-18HRFN1-QRC8W KOC-18HFN1-QRC4W KFU-18HRFN1-QRC8GW KOC1-18HFN1-QRC8GW KFU-18HRFN1-QRD0GW KOZ-18HFN1-QRD0GW KOF-24HFN1-QRC8W KFU-24HRFN1-QRC8W KOF-24HFN1-QRC8GW KFU-24HRDN1-QRC8GW KOF-24HFN1-QRD0GW KFU-24HRFN1-QRD0GW 2 ways of drainage(O) Filter Killer Of Formaldehyde...

  • Page 8: Dimension

    3. Dimension 3.1 Indoor Unit Model KFU-09HRDN1-QRC8W KFU-09HRDN1-QRC8GW KFU-12HRFN1-QRC8W KFU-12HRDN1-QRC8GW KFU-18HRFN1-QRC8W KFU-18HRFN1-QRC8GW KFU-18HRFN1-QRD0GW KFU-24HRFN1-QRC8W 1045 KFU-24HRDN1-QRC8GW 1045 KFU-24HRFN1-QRD0GW 1045...
  • Page 9 Model L(mm) R(mm) H(mm) Dimension of installation hole(mm) KFU-09HRDN1-QRC8W KFU-09HRDN1-QRC8GW KFU-12HRDN1-QRC8GW ￠65 KFU-12HRFN1-QRC8W KFU-18HRFN1-QRC8W KFU-18HRFN1-QRC8GW KFU-18HRFN1-QRD0GW Model L(mm) R(mm) H(mm) Dimension of installation hole(mm) KFU-24HRFN1-QRC8W ￠65 KFU-24HRDN1-QRC8GW KFU-24HRFN1-QRD0GW...

  • Page 10: Outdoor Unit

    3.2 Outdoor Unit More than 30cm More than 60cm (Service space) More than 30cm More than 60cm More than 200cm Model KOB-09HFN1-QRC8W KOB-09HFN1-QRD0GW KOB-12HFN1-QRC8W KOB1-12HFN1-QRD0GW KOC-18HFN1-QRC4W KOC1-18HFN1-QRC8GW KOZ-18HFN1-QRD0GW KOF-24HFN1-QRC8W KOF-24HFN1-QRC8GW KOF-24HFN1-QRD0GW...

  • Page 11: Refrigerant Cycle Diagram

    4. Refrigerant Cycle Diagram INDOOR OUTDOOR CHECK VALVE LIQUID SIDE (Heating Model only) 2-WAY VALVE T3 Condenser temp. sensor CAPILIARY TUBE HEAT EXCHANGE HEAT (EVAPORATOR) T4 Ambient T1 Room temp. EXCHANGE temp. sensor sensor (CONDENSER) T2 Evaporator temp. sensor GAS SIDE 4-WAY VALVE 3-WAY VALVE Accumulator...

  • Page 12: Wiring Diagram

    5. Wiring Diagram 5.1 Indoor Unit KFU-09HRDN1-QRC8W, KFU-09HRDN1-QRC8GW...
  • Page 13 KFU-12HRFN1-QRC8W, KFU-12HRDN1-QRC8GW, KFU-18HRFN1-QRC8W, KFU-18HRFN1-QRC8GW, KFU-18HRFN1-QRD0GW , KFU-24HRFN1-QRC8W, KFU-24HRFN1-QRD0GW...
  • Page 14 KFU-24HRDN1-QRC8GW...
  • Page 15 5.2 Outdoor Unit KOB-09HFN1-QRC8W KOB-09HFN1-QRD0GW...
  • Page 16 KOB-12HFN1-QRC8W, KOC-18HFN1-QRC4W...
  • Page 17 KOB1-12HFN1-QRD0GW, KOZ-18HFN1-QRD0GW, KOC1-18HFN1-QRC8GW...
  • Page 18 KOF-24HFN1-QRC8W, KOF-24HFN1-QRD0GW, KOF-24HFN1-QRC8GW...

  • Page 19: Installation Details

    6 Installation Details 6.1 Wrench torque sheet for installation Outside diameter Torque Additional tightening torque inch N.cm N.cm Ф6.35 ¼ 1500(153kgf.cm) 1600(163kgf.cm) Ф9.52 2500(255kgf.cm) 2600(265kgf.cm) Ф12.7 ½ 3500(357kgf.cm) 3600(367kgf.cm) Ф15.9 4500(459kgf.cm) 4700(479kgf.cm) Ф19 ¾ 6500(663kgf.cm) 6700(683kgf.cm) 6.2 Connecting the cables The power cord of connect should be selected according to the following specifications sheet.

  • Page 20: Pipe Length And The Elevation

    6.3 Pipe length and the elevation The pipe length and refrigerant amount: Pipe size Standard Max. Max. Additional Model length Elevation Length refrigerant B (m) A (m) (g/m) Liquid KFU-09HRDN1-QRC8W+KOB-09HFN1-QRC8W KFU-09HRDN1-QRC8GW+KOB-09HFN1-QRD0GW 3/8’’ ¼’’ (Ф9.52) (Ф6.35) KFU-12HRFN1-QRC8W+KOB-12HFN1-QRC8W KFU-12HRDN1-QRC8GW+KOB1-12HFN1-QRD0GW KFU-18HRFN1-QRC8W+KOC-18HFN1-QRC4W ½’’ ¼’’ KFU-18HRFN1-QRC8GW+KOC1-18HFN1-QRC8GW (Ф12.7) (Ф6.35) KFU-18HRFN1-QRD0GW+KOZ-18HFN1-QRD0GW KFU-24HRFN1-QRC8W+KOF-24HFN1-QRC8W 3/5’’...

  • Page 21: Installation For The First Time

    6.4 Installation for the first time Air and moisture in the refrigerant system have undesirable effects as below: ● Pressure in the system rises. ● Operating current rises. ● Cooling or heating efficiency drops. ● Moisture in the refrigerant circuit may freeze and block capillary tubing. ●...
  • Page 22 5) Operate the vacuum pump to evacuate. 6) Make evacuation for 30 minutes and check whether the compound meter indicates -0.1Mpa. If the meter does not indicate -0.1Mpa after pumping 30 minutes, it should be pumped 20 minutes more. If the pressure can’t achieve -0.1Mpa after pumping 50 minutes, please check if there are some leakage points.
  • Page 23 Check the flare connections for gas leakage. 5). Discharge the refrigerant. Close the valve on the charging cylinder and discharge the refrigerant by loosening the flare nut on the 2-way valve approximately 45’ until the gauge indicates 0.3 to 0.5 Mpa. 6).

  • Page 24: Adding The Refrigerant After Running The System For Many Years

    3) Put the charging cylinder onto the electronic scale and record the weight. 4) Operate the air conditioner at the cooling mode. 5) Open the valves (Low side) on the charge set and charge the system with liquid refrigerant. 6).When the electronic scale displays the proper weight (refer to the table), disconnect the charge hose from the 3-way valve’s service port immediately and turn off the air conditioner before disconnecting the hose.

  • Page 25: Re-Installation While The Indoor Unit Need To Be Repaired

    6).When the electronic scale displays the proper weight (refer to the gauge and the pressure of the low side), disconnect the charge hose from the 3-way valve’s service port immediately and turn off the air conditioner before disconnecting the hose. 7).
  • Page 26 5). Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 0.1MPa. 6). Set the 3-way valve to the closed position immediately Do this quickly so that the gauge ends up indicating 0.3 to 0.5Mpa. Disconnect the charge set, and tighten the 2-way and 3-way valve’s stem nuts.

  • Page 27: Re-Installation While The Outdoor Unit Need To Be Repaired

    5). Discharge the refrigerant. Close the valve on the charging cylinder and discharge the refrigerant by loosening the flare nut on the 2-way valve approximately 45’ until the gauge indicates 0.3 to 0.5 Mpa. 6). Disconnect the charge set and the charging cylinder, and set the 2-way and 3-way valves to the open position Be sure to use a hexagonal wrench to operate the valve stems.
  • Page 28 5). Disconnect the charge hose from the vacuum pump.
  • Page 29 2. Refrigerant charging Electronic scale 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.
  • Page 30 Be sure to check for gas leakage...

  • Page 31: Operation Characteristics

    7. Operation Characteristics Temperature Cooling operation Heating operation Drying operation Mode ≥17℃ ≤30℃ ＞10℃ Room temperature 0℃～50℃ -15℃～50℃ Outdoor temperature -15℃～30℃ 0℃～50℃ (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 32: Electronic Function

    8. Electronic function 8.1 Abbreviation T1: Indoor room temperature T2: Coil temperature of evaporator T3: Coil temperature of condenser T4: Outdoor ambient temperature T5: Compressor discharge temperature 8.2 Display function 8.2.1 Icon explanation on indoor display board. ION indication lamp(optional function)：This lamp illuminates when Clean Air feature is activated.

  • Page 33: Main Protection

    8.3 Main Protection 8.3.1 Time delay at restart for compressor 1 minute delay for the 1 time start-up and 3 minutes delay for others. 8.3.2 Temperature protection of compressor top The unit will stop working when the compressor top temp. protector cut off, and will restart after the compressor top temp.
  • Page 34 KFU-18HRFN1-QRD0GW, KFU-24HRDN1-QRC8GW , KFU-24HRFN1-QRD0GW models: Fault temp. Operation in cooling, Operation in heating mode sensor drying and fan only mode Run supposed T1=26℃ Run supposed T1=26℃ medium fan speed high fan speed Normal During the first 1 minute of compressor operation, indoor fan shuts off.
  • Page 35 KFU-09HRDN1-QRC8W, KFU-09HRDN1-QRC8GW, KFU-12HRDN1-QRC8GW, KFU-24HRDN1-QRC8GW) If AC detects time interval is not correct for continuous 240s, the unit will stop and the LED will display the failure. The correct zero crossing signal time interval should be between 6-13ms.

  • Page 36: Operation Modes And Functions

    8.4 Operation Modes and Functions 8.4.1 Fan mode (1) Outdoor fan and compressor stop. (2) Temperature setting function is disabled, and no setting temperature is displayed. (3) Indoor fan can be set to high/med/low/auto. (4) The louver operates same as in cooling mode. (5) Auto fan: T1-24 (H-L)*0.75+L...
  • Page 37 8.4.2 Cooling Mode 8.4.2.1 Compressor running rules The maximum operation frequency of compressor after starting submits to following rule. Fmax=T4FREMAX1 Fmax=T4FREMAX2 Fmax=T4FREMAX3 Fmax=T4FREMAX4 Fmax=T4FREMAX5 Fmax=T4FREMAX6 Fmax=T4FREMAX7 Meanwhile, the maximum frequency is limited by the indoor fan speed. Indoor fan speed Maximum frequency High speed / turbo function No limit...
  • Page 38 T1-Ts -1.0 -1.5 While the zones of A,B,C... are corresponding to different compressor running frequency. Note: When T1-Ts keeps in the same temp. zone for 3 minutes, the compressor will run as the below rules: A:Increase the frequency to 3 grade higher until to FREMAX. B~E: Increase the frequency to 2 grade higher until to FREMAX.
  • Page 39 Cooling While A,B,C…means different fan speed of outdoor unit. 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, auto and silent. When the compressor is running, the indoor fan is controlled as below:...
  • Page 40 The auto fan acts as below rules: T1-Ts (H-L)*0.75+L (H-L)*0.5+L (H-L)*0.25+L 8.4.2.4 Condenser temperature protection ---55℃<T3<60℃, the compressor frequency will decrease to the lower level until to F1 and then runs at F1.If T3<54℃, the compressor will keep running at the current frequency. ---T3<52℃, the compressor will not limit the frequency and resume to the former frequency.
  • Page 41 8.4.3 Heating Mode 8.4.3.1 Compressor running rules The maximum operation frequency of the compressor after starting submits to the following rule. Fmax=T4FREHEATMAX1 Fmax=T4FREHEATMAX2 Fmax=T4FREHEATMAX3 Fmax=T4FREHEATMAX4 Fmax=T4FREHEATMAX5 Fmax=T4FREHEATMAX6 Fmax=T4FREHEATMAX7 Fmax=T4FREHEATMAX8 Fmax=T4FREHEATMAX9 Fmax=F21 Fmax=F22 Fmax=F23 Fmax=F24 Fmax=F25...
  • Page 42 Meanwhile, the maximum frequency is limited by the indoor fan speed. Indoor fan speed Maximum frequency High speed/8 degree heating/ turbo function No limit Medium speed FHeatMaxMidFan Low speed/sleep mode FHeatMaxLowFan Silent mode Fixed at F3 If users switch on AC by remote controller, the compressor will run at the Fmax frequency for 7 minutes according to outdoor ambient temp.
  • Page 43 HeatT4Zone4I HeatT4Zone3I HeatT4Zone2I HeatT4Zone1I 8.4.3.2 Outdoor fan running rules Heating 8.4.3.3 Indoor fan running rules In heating mode, indoor fan can be selected as high, medium, low, auto and silent. The anti-cold- wind function is preferential. The running rules of anti-cold-wind function depend on both T1 and T2 that is more comfortable control.
  • Page 44 If the compressor stops caused by the room temperature rising, the indoor fan will be forced to run seconds with breeze. During this period, the anti-cold-wind is disabled. Auto fan action in heating mode: T1-Ts+¦ ¤ T -1.0 (H+-L)*0.2+L -2.0 (H+-L)*0.4+L -3.0 (H+-L)*0.6+L...
  • Page 45 8.4.3.4 Defrosting mode Condition of defrosting: If any one of the following items is satisfied, AC will enter the defrosting mode. After the compressor starts up and keeps running, mark the minimum value of T3 from the 10 minutes to 15 minutes as T30.
  • Page 46 Defrosting action： For KFU-09HRDN1-QRC8W, KFU-12HRFN1-QRC8W models: Frequency F3 FrequencyF16 Compressor 4-way valve Outdoor fan Indoor fan Indoor fan breeze(10s) no longer than 10m xx=60 For KFU-18HRFN1-QRC8W, KFU-24HRFN1-QRC8W models: Frequency F3 Frequency F16 Compressor 4-way valve Outdoor fan Indoor fan Indoor fan breeze(10s)
  • Page 47 For KFU-09HRDN1-QRC8GW, KFU-12HRDN1-QRC8GW models: Compressor 4-way valve Outdoor fan no longer than 10m xx=20. KFU-18HRFN1-QRC8GW KFU-18HRFN1-QRD0GW, KFU-24HRFN1-QRD0GW KFU-24HRDN1-QRC8GW models: Compressor 4-way valve Outdoor fan no longer than 10m xx=20...
  • Page 48 8.4.3.5 Evaporator coil temperature protection TEstop Decrease TEdown Hold TEnorm Resume Off: Compressor stops. Decrease: Decrease the running frequency to the lower level. Hold: Keep the current frequency. Resume: No limitation for frequency. 8.4.4 Auto-mode This mode can be chosen with remote controller and the setting temperature can be changed between 17~30℃. In auto mode, the machine will choose cooling, heating or fan-only mode according to ΔT (ΔT =T1-Ts).
  • Page 49 T1-Ts 8.4.5.3 Low indoor room temperature protection In drying mode, if room temperature is lower than 10℃, the compressor will stop and not resume until room temperature exceeds 12℃. 8.4.5.4 Evaporator anti-freezing protection, condenser high temperature protection and outdoor unit frequency limit are active and the same as that in cooling mode.
  • Page 50 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. Operation process in sleep mode is as follow: When cooling, the setting temperature rises 1℃ (be lower than 30℃) every one hour, 2 hours later the setting temperature stops rising and indoor fan is fixed as low speed.
  • Page 51 system. In the first 10 seconds after power on, this protection is inactive. When this protection happens, it will last 3 minutes and then the PCB will detect the power supply voltage again.

  • Page 52: Troubleshooting

    9. Troubleshooting 9.1 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 Zero crossing signal detection error(only for ☆ 3 times MS12FU-09HRDN1-QRC8W, MS12FU-09HRDN1-QRC8GW, MS12FU-12HRDN1-QRC8GW, MS12F-24HRDN1-QRC8GW) ☆...

  • Page 53: Diagnosis And Solution

    9.2 Diagnosis and Solution 9.2.1 EEPROM parameter error diagnosis and solution(E0) Shut off the power supply and turn it on 5 seconds later. Is it still displaying the error code? If the EEPROM chip is welded on main PCB, replace the main PCB directly.
  • Page 54 9.2.2 Indoor unit and outdoor unit communication protection error diagnosis and solution (E1) Power off, then turn on the unit 5 seconds later(reconnect the power wire).Is the error still displaying after several minutes? Check all the wirings between indoor and outdoor, indoor main PCB and outdoor main PCB following the wiring diagram.
  • Page 55 9.2.3 Zero crossing detection error diagnosis and solution(E2) Check if the connections and Correct the connections. Turn on the power supply is normal? unit when the power supply is good. Indoor main PCB is defective. Replace indoor main PCB. 9.2.4 Fan speed has been out of control diagnosis and solution (E3/F5) Shut off the power supply and turn it on 5 seconds The unit operates normally.
  • Page 56 Index 1: 1. Indoor AC Fan Motor Measure the resistance value of each winding by using the tester. 2.Outdoor or indoor DC Fan Motor (control chip is in fan motor) Measure the resistance value of each winding by using the tester. If any resistance value is zero, the fan motor must have problems and need to be replaced.
  • Page 57 For other motors: Orange Grey White Pink Black Color Signal Color Blue Yellow Signal 2) Release the UVW connector. Measure the resistance of U-V, U-W, V-W. If the resistance is not equal to each other, the fan motor must has problems and need to be replaced. Otherwise, go to step 2.
  • Page 58 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 must has problems and need to be replaced.
  • Page 59 9.2.5 Open circuit or short circuit of temperature sensor diagnosis and solution (E4/E5/F1/F2/F3) Check the connections between temperature Correct the connections. sensor and PCB. Are the connections good? Check the resistance value of the sensor via table1 Replace indoor or outdoor PCB. and table 2, is it normal? Replace the sensor and c h e c k i f t h e p r o b l e m...
  • Page 60 9.2.6 Refrigerant Leakage Detection diagnosis and solution (EC) Shut off the power supply and turn it on 5 seconds later. Is it still displaying the error code? Check if T2 sensor is well Is there cool air blowing fixed. Correct the installation or replace T2 sensor.
  • Page 61 9.2.7 IPM malfunction or IGBT over-strong current protection diagnosis and solution(P0) Check if the wiring between main Correct the connection or PCB and compressor connected by replace the wires and error and if the wires and connectors connectors. are broken? Correct the installation, Check if the IPM installed correctly.
  • Page 62 9.2.9 Over voltage or too low voltage protection diagnosis and solution(P1) Disconnect the unit with power Check if the power supply is supply and try to restart the unit normal. when power supply gets normal. Check if all the connections Correct the connections or replace and wires are good? the wires.
  • Page 63 9.2.10 High temperature protection of compressor top diagnosis and solution(P2) Check if the air flow system Clear up the air inlet and outlet or the heat of indoor and outdoor units exchanger of indoor and outdoor units. are obstructed? Turn off the power supply and turn it on 10 minutes later.
  • Page 64 9.2.11 Inverter compressor drive error diagnosis and solution(P4) Check if the wiring between main Correct the connection or PCB and compressor connected by replace the wires and error and if the wires and connectors connectors. are broken? Correct the installation, Check if the IPM installed correctly.
  • Page 65 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!) 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 66 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. Table 1: Some frequently-used R-T data for T1,T2,T3 and T4 sensor: Temperature (℃) Resistance Value (KΩ) 26.9...
  • Page 67 Compressor DA108X1C-23EZ DA108X1C-23EZ DA130M1C-31FZ DA150S1C-20FZ WZDK20-38G WZDK30-38G WZDK58-38G Indoor fan motor RPG20E (☆) (☆) (☆) Outdoor fan WZDK35-38G WZDK35-38G(H) WZDK35-38G(H) WZDK50-38G motor (☆) (★) (★) (☆)
  • Page 68 Code 2T0032300888 2T0032400274 2T0032800688 2T0032900557 KFU-09HRDN1-QRC8 KFU-12HRDN1-QRC8 KFU-18HRFN1-QRC8 KFU-24HRDN1-QRC8 Model Compressor ASN108D22UEZ ASN108D22UEZ DA130M1C-31FZ DA150S1C-20FZ WZDK30-38G Indoor fan motor RPG20E RPG20E RPG45C (☆) Outdoor fan WZDK36-38G-W WZDK36-38G-W WZDK36-38G-W WZDK50-38G motor (★) (★) (★) (☆) Code 2T0032800695 2T0032900561 KFU-18HRFN1-QRD0 KFU-24HRFN1-QRD0 Model Compressor DA130M1C-31FZ DA150S1C-20FZ...
  • Page 69 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 (+)Red (-)Black ∞...

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