Pioneer WYT012GLUI25FV Service Manual
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Pioneer WYT012GLUI25FV Service Manual

Pioneer WYT012GLUI25FV Service Manual

Inverter air conditioner
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Air Conditioner Service Manual
Inverter Air Conditioner
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WYT012GLUI25FV
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Summary of Contents for Pioneer WYT012GLUI25FV

  • Page 1 Air Conditioner Service Manual Inverter Air Conditioner Service Manual Models: WYT012GLUI25FV...

  • Page 2: Table Of Contents

    Air Conditioner Service Manual CONTENTS Part I Technical Information ..................... 2 1. Important Notice ........................2 2. Specifications ........................3 2.1 Operation Characteristic Curve ....................3 2.2 Refrigeration Cycle Diagram ......................5 3. Product Dimensions ......................6 4. Electric Diagram ........................7 4.1 Wiring Diagram ..........................

  • Page 3: Part I Technical Information

    Air Conditioner Service Manual Part I Technical Information 1. Important Notice This service manual is intended for individuals with adequate electrical, electronic, and mechanical experience. Any attempt to repair the appliance may result in personal injury and property damage. The manufacturer or seller cannot be responsible for the interpretation of this information, nor can it assume any liability in connection with its use.

  • Page 4: Specifications

    Air Conditioner Service Manual 2. Specifications 2.1 Operation Characteristic Curve The Relation Curve of Capacity-Ambient Temperature The Relation Curve of Pressure-Temperature WYT012GLUI25FV High Pressure Low Pressure f(Hz) (MPa/psi) (MPa/psi) 95°F(35°C) 2.996/434.5 0.863/ 125.1 Cooling 109°F(43°C) 3.76/545.3 0.965/139.9 Cooling 118°F(48°C) 3.85/558.4 1.05/152.2...
  • Page 5 Air Conditioner Service Manual The Relation Curve of Noise-Operation Frequency Range of Normal Operating Environment Temperature WYT012GLUI25FV Mode Room Temperature Outdoor Temperature Cooling 63~90°F(17~32°C) 5~118°F(-15~48°C) Operation Heating 32~81°F(0~27°C) 19~75°F(-7~24°C) Operation Drying 64~90°F(18~32°C) 59~118°F(15~48°C) Operation...

  • Page 6: Refrigeration Cycle Diagram

    Air Conditioner Service Manual 2.2 Refrigeration Cycle Diagram WYT012GLUI25FV Check valve Liquid side 2-way valve Capillary Heat exchange Heat exchange (Condenser) (Evaporator) Gas side 3-way valve 4-way valve Muffler Muffler Heating Cooling Compressor...

  • Page 7: Product Dimensions

    Indoor Unit (inch/mm) Outdoor Unit (inch/mm) Model 29¼ inch 1⅞ inch 36¼ inch 8¼ inch 12¼ inch 21¾ inch 10 inch 17⅛ inch 12 inch 11¼ inch 2¼ inch WYT012GLUI25FV 48mm 922mm 208mm 313mm 741mm 551mm 253mm 434mm 305mm 285mm 58mm...

  • Page 8: Electric Diagram

    Air Conditioner Service Manual 4. Electric Diagram 4.1 Wiring Diagram Model: WYT012GLUI25FV Indoor Unit...
  • Page 9 Air Conditioner Service Manual Outdoor Unit:...

  • Page 10: Pcb Layout

    Air Conditioner Service Manual 4.2 PCB Layout Indoor Unit Indoor PCB ODU AC power output Model: WYT012GLUI25FV Fuse ODU AC power input Top view ODU power supply IDU power input DC motor driver IDU/ODU wiring connection-N connector Power supply-N connector...
  • Page 11 Air Conditioner Service Manual Outdoor Unit Outdoor PCB Model: WYT012GLUI25FV Top view 4-way valve Heater L, N and communication Fuse ODU PCB main relay DC motor connector Electronic expansion valve Discharge sensor connector OAT/OPT sensor connector LED5 Bottom view...

  • Page 12: Electronic Controller Introduction

    Air Conditioner Service Manual 5. Electronic Controller Introduction 5.1 Remote Controller The display and some functions of the remote controller may differ.
  • Page 13 Air Conditioner Service Manual The display and some functions of the remote controller may differ. The shape/position of the switches and indicators may differ according to the model, but the function is the same. The unit confirms each button press with a beep.

  • Page 14: Electronic Control

    Air Conditioner Service Manual 5.2 Electronic Controller RT --- Room Temperature IPT --- Indoor Pipe Coil Temperature ST --- Indoor Setting Temperature OPT --- Outdoor Pipe Temperature OAT --- Outdoor Ambient Temperature ODT --- Outdoor Discharge Temperature CRT --- Compensated Room Temperature IDU --- Indoor Unit ODU --- Outdoor Unit Note: When finishing installation, the air inlet on the unit and airflow throughout the room can vary in...

  • Page 15: Cooling Mode

    Air Conditioner Service Manual 5.2.2 Cooling Mode (1). Temperature Control: 61-88°F(16-31°C), and the fan speed and louver position will automatically adjust based on the Cooling mode presets. (2). Compressor and Process Control: 1) When RT-ST ≥ 34°F(1°C), the compressor starts up and the AC operates as customer preset. 2) When: A.

  • Page 16: Dry Mode

    Air Conditioner Service Manual RT-ST 33°F / 0.5°C 32°F / 0°C 30°F / -1°C 28°F / -2°C 27°F / -3°C 10 min 5 min ≥ 3min 2 min ≥ 7 min 160s 160s Compressor Outdoor fan Indoor fan 5.2.3 Dry Mode 1) Temperature Control: 61-88°F(16-31°C) Fan Speed: Low Vane Blade Position: As customer preset...
  • Page 17 Air Conditioner Service Manual (3). IDU Time Delay When the compressor stops or the unit switches Off while in Heating mode, the IDU fan motor will operate for a few more seconds to prevent overheating. (4). ODU Fan Motor Control 1) While unit: A.
  • Page 18 Air Conditioner Service Manual (6). Defrost Note: t1: The compressor continuous operation time. t2: AC unit operation first time going to defrost circle. t3: The compressor accumulated operation time. When OPT ≤ 37°F(3°C), the unit starts to count the time for t3. When AC unit operates to: A.

  • Page 19: Fan Mode

    Air Conditioner Service Manual 2) Vane Blade Operation for Cold Air Prevention: A. If the vane works on the status of non-swing while IPT increases to a special degree, the vane blade will change the position to: --- Default angle or --- Previous position or --- Customer preset.

  • Page 20: Sleeping Mode

    Air Conditioner Service Manual 5.2.7 Sleeping Mode While the AC operates in Sleeping mode, the power supply and sleep lights will always be On. The temperature display will be Off after 15s. In this mode, the AC unit works according to the Sleep Curve as designed. In Sleeping mode, the unit can operate for 10 hours continuously.
  • Page 21 Air Conditioner Service Manual (3). Compressor Discharge Temperature Protection 1) If ODT ≥ 239°F(115°C), the unit stops operating for over-temperature protection. While ODT < 212°F(100°C) and after the compressor stops for 3 min, the unit can be started. 2) If ODT ≥ 212°F(100°C), the compressor will be frequency limited/reduced for over-temperature protection. 3) If the unit has entered discharge over-temperature stop-working protection 6 times consecutively, the protection can’t be recovered unless you press the On/Off button.

  • Page 22: Calibration Test Mode

    Air Conditioner Service Manual 5.2.11 Complementary 1) Energy Saving (Eco) Function effective in Cooling and Heating modes only. In Cooling mode, the set temperature range is from 79-88°F (26-31°C). In Heating mode, the set temperature range is from 61-77°F (16-25°C). 2) Turbo Function effective in Cooling, Heating, Fan, and Auto modes.

  • Page 23: Part Ii Installation And Maintenance

    Air Conditioner Service Manual Part II Installation and Maintenance 1. Notes for Installation and Maintenance Safety Precautions Important! Read the safety precautions carefully before installation and maintenance. The following contents are important for installation and maintenance. Follow the instructions below: •...

  • Page 24: Electrical Safety Precautions

    Air Conditioner Service Manual Warnings Electrical Safety Precautions 1) Turn Off the air conditioner's power supply before starting maintenance. 2) The air conditioner must apply a specialized circuit. Prohibit sharing the same circuit with other appliances. 3) Install the air conditioner in a suitable location. Ensure the power plug is touchable. 4) Make sure each wiring terminal is connected firmly during installation and maintenance.

  • Page 25: Installation Safety Precautions

    Air Conditioner Service Manual Installation Safety Precautions 1) Select the installation location according to the requirements of this manual. (See the requirements in the Installation section). 2) Handle unit transportation with care. The unit should not be carried by only 1 person if it is more than 44 lbs (20kg).
  • Page 26 Air Conditioner Service Manual Introduction R32 Air Conditioner Installation 1) Introduction to Refrigerants R32 The refrigerants used for air conditioners are environmentally-friendly hydrocarbons R32. The two kinds of refrigerants are combustible and odorless. In addition, they can burn and explode under certain condition. However, there will be no risk of burning and explosion, if you correctly utilize the following table to install your air conditioner in a room with an appropriate area.

  • Page 27: Installation Safety

    Air Conditioner Service Manual Caution: • Contact your nearest after-sale service center when maintenance is necessary. At the time of maintenance, the maintenance personnel must strictly comply with the Operation Manual provided by the corresponding manufacturer. Any non-professional individual is prohibited to maintain the air conditioner. •...
  • Page 28 Air Conditioner Service Manual Caution: • Installation must occur in a well-ventilated location. • When using Refrigerant R32/R290 during installation or maintenance, the location must be free from open fire, welding, smoking, drying oven, or any other goods with temperatures higher than 698°F/370°C (R290) and 1,018°F/548°C (R32).

  • Page 29: Maintenance

    Air Conditioner Service Manual Maintenance (1). Inspections Before Maintenance 1) Inspection of Maintenance Environment • Before operation, ensure no leaked refrigerant is present in the room. • Only operate in rooms meeting the area requirements on the nameplate. • Ensure the room maintains a continuous ventilation state. •...
  • Page 30 Air Conditioner Service Manual • If the product is damaged to the extent that the refrigerant system must be opened for maintenance, carry the product back to the maintenance station. Welding refrigerant pipes or conducting similar operations are prohibited at the user's site. •...
  • Page 31 Air Conditioner Service Manual (7). In-Maintenance Welding • Ensure the maintenance location is well-ventilated. • Before welding the outdoor unit, confirm the refrigerating system has been drained and cleaned. Ensure there is no refrigerant in the outdoor unit. • Close the stop valve of the outdoor unit when using a welding gun to complete maintenance work such as cutting and welding.

  • Page 32: Installation

    Air Conditioner Service Manual 2. Installation 2.1 Installation Dimension Diagram...

  • Page 33: Accessory

    Air Conditioner Service Manual 2.2 Accessory Remote controller Batteries Vinyl tape Screw Efficient purification Wall cover Pressure tube plate Sealant filter Threaded fresh air pipe Hole cover Drain hose Insulation material 2.3 Tools Picture Picture Picture Tool Name Tool Name Tool Name Standard Pipe cutter...

  • Page 34: Position

    Air Conditioner Service Manual 2.4 Position Outdoor Unit Indoor Unit • Do not install the outdoor unit near sources of • Install the indoor unit on a strong wall that is heat, steam, or flammable gas. not subject to vibrations. •...

  • Page 35: Electricity And Wiring

    Air Conditioner Service Manual 2.5 Electricity and Wiring For the special installation of the back pipe, drill 2 standard wall holes (diameter 2½ inch / 63mm) Safety Precautions side by side (width 4⅛ inch / 105mm) as shown in the following figure. •...

  • Page 36: Refrigerant Piping Connection

    Air Conditioner Service Manual ★ Refrigerant Piping Connection 2.6.3 Electrical Connections --- Indoor unit The piping can be run in 3 directions, which is 1) Lift the front panel. indicated by numbers in the picture. When the piping is run in direction 1 or 3, cut a notch along the groove 2) Take off the cover, as indicated in the on the side of the indoor unit with a cutter.

  • Page 37: Wrap The Insulation Material Around The Connecting Portion

    Air Conditioner Service Manual 2.6.6 Indoor Unit Condensed Water Drainage 2.6.5 Connections to the Indoor Unit 1) Remove the indoor unit pipe cap. Confirm The indoor unit condensed water drainage is there is no debris inside. fundamental for the success of the installation. 1) Place the drain hose below the piping, taking 2) Insert the fare nut and create a flange at the care not to create siphons.
  • Page 38 Air Conditioner Service Manual 2.6.7 Connect the Fresh Air pipe 2.6.8 Wrap Piping and Cable 1) Select the appropriate piping mode according to After the refrigerant pipes, connecting wires, the wall hole position. and drainage hose are installed, bundle them together with insulating tape before passing Mode 1: (Left) Together with the refrigerant piping, them through the wall hole.
  • Page 39 Air Conditioner Service Manual 2.6.9 Mount Indoor Unit Notes: 1) The distance between the fresh air inlet and 1) Slowly pass the refrigerant pipes, connecting the wall should not exceed 13¾ inch (350mm). wires, and drainage hose wrapped in a bundle through the wall hole.

  • Page 40: Odu Installation

    Air Conditioner Service Manual 2.7 ODU Installation • Install the outdoor unit on a solid wall and fasten Electronic Connections the unit securely. 1) Take the cover away. • Before connecting the pipes and cables, select 2) Connect the cable wires to the terminal board the position on the wall and leave enough space using the same numbering as in the indoor unit.

  • Page 41: Vacuum And Gas Leakage Test

    Air Conditioner Service Manual 2.9 Final Test 2.8 Vacuum and Gas Leakage Test (1). Use Vacuum Pump (1). Preparation of Test Operation • The client approves the air conditioner 1) After connecting the indoor and outdoor units, installation. bleed the air and humidity from the refrigerant circuit by using a vacuum pump.

  • Page 42: Maintenance

    Air Conditioner Service Manual 3. Maintenance 3.1 Failure Code Code Reason Remark IDU and ODU communication failure Is the IDU and ODU wiring connection correct? IDU room temperature sensor failure IDU sensor and PCB (IDU RT failure) IDU coil temperature sensor failure IDU sensor and PCB (IDU IPT failure) ODU coil temperature sensor failure (OPT)
  • Page 43 Air Conditioner Service Manual PFC protection Check the troubleshooting for details Compressor lack of phase / Anti-phase Check the troubleshooting for details protection IPM module temperature protection Check the troubleshooting for details 4-way value reversing abnormal Check the troubleshooting for details Module temperature test circuit failure ODU PCB Compressor phase-current test circuit failure...

  • Page 44: Troubleshooting

    Air Conditioner Service Manual 3.2 Troubleshooting 1) E0 --- IDU and ODU Communication Failure Start Display E0 Is the IDU wiring Check and E0 disappear? connection correct? reconnect Is the communication Replace and E0 disappear? wiring and connection reconnect in good condition? Is the ODU wiring Check and E0 disappear?
  • Page 45 Air Conditioner Service Manual 2) E1, E2 --- IDU Room Temperature Sensor Failure and/or Coil Temperature Sensor Failure Start Display E1 or E2 Is the sensor well-connected to Reconnect the PCB? E1/E2 disappear? Use multimeter to check the sensor. Is it experiencing a Replace the sensor short circuit or an open circuit fault?
  • Page 46 Air Conditioner Service Manual 3) E6 --- IDU Ventilation Failure (PG and DC Fan Motor Only) Start Display E6 Turn the fan blades by hand while power Off Adjust the motor and blade Can the fan blades run assembly so that rotor can smoothly? run smoothly.
  • Page 47 Air Conditioner Service Manual 4) E3, E7, or E8 --- ODU Coil Temperature Sensor Failure, Ambient Temperature Sensor Failure, and/or Discharge Temperature Sensor Failure If any of the sensors resistances experience a short circuit or an open circuit fault, the unit will display error codes as "E3", "E7", or "E8".
  • Page 48 Air Conditioner Service Manual 5) E9 --- ODU IPM / Compressor Drive Fault If the unit stops operating for IPM protection 6 times consecutively, it will display the "E9" error code. The unit can’t be recovered to operation, except by pressing the On/Off button. Display E9 Display F9 or FA first, Replace ODU PCB...
  • Page 49 Air Conditioner Service Manual 6) EF --- ODU DC Fan Motor Failure Shut Off Check the fan blade by Reinstall the DC motor hand. Can it rotate freely? Operates normally? Is the fan motor well- Reconnect connected to the PCB? Operates normally? 1.
  • Page 50 Air Conditioner Service Manual 7) EU --- ODU Voltage Test Sensor Failure After the power relay begins operating, if the tested effective voltage is less than 50V for 3s continuously, the unit will display the “EU” error code. Start Display EU Test voltage btw ODU Check while voltage terminal L/N, more than...
  • Page 51 Air Conditioner Service Manual 8) P0 --- IPM Protection If the IPM is experiencing overheating or over-current conditions, the AC unit will display the "P0" error code. Display P0 Restart unit. Does it operate normal? Is the wiring connection U/V/W Reconnect correct? P0 disappear?
  • Page 52 Air Conditioner Service Manual 9) P1 --- Over /Under-Voltage Protection 1. Test voltage between L and N. When the power supply V > AC260V or V < AC150V, the AC will display the "P1" error code. The unit will recover back to the previous status while V > AC155V. 2.
  • Page 53 Air Conditioner Service Manual 10) P2 --- Over-Current Protection When the AC unit's running current is more than Imax, the unit will stop and display the "P2" error code. Note: For different AC models, the Imax has different valves. Display P2 Does the ODU Replace the fan motor fan motor...
  • Page 54 Air Conditioner Service Manual 11) P4 --- ODU Discharge Temperature Overheating Protection Display P4 Is the ODU temperature higher Normal protection than 140°F(60°C)? Is the ODU Adjust ODU Is the unit Enough space for location installation operating? ventilation? acceptable? Condenser too Clean the IDU filter P4 disappear? dirty? or filter...
  • Page 55 Air Conditioner Service Manual 12) P5 --- Sub-Cooling Protection in Cooling/Dry Mode In Cooling or Dry mode, when the IDU evaporator coil temperature is IPT < 34°F(1°C) continuously for 3 min after the compressor starts up for 6 min, the CPU will switch Off the outdoor unit and display the "P5" error code. Display P5 Switch On the unit after 5 min...
  • Page 56 Air Conditioner Service Manual 13) P6 --- Overheating Protection in Cooling Mode In Cooling or Dry mode, when the ODU condenser coil temperature is OPT ≥ 144°F(62°C), the MCU will switch Off the outdoor unit and display the "P6" error code. Display P6 Does the ODU Is the fan motor...
  • Page 57 Air Conditioner Service Manual 14) P7 --- Overheating Protection in Heating Mode In Heating mode, when the IDU evaporator coil temperature is IPT ≥ 144°F(62°C), the ODU PCB will switch Off the outdoor unit and display the "P7" error code. Display P7 Does the ODU Is the fan motor...
  • Page 58 Air Conditioner Service Manual 15) P8 --- Outdoor Over-Temperature / Under-Temperature Protection If the system experiences the following environment temperatures, the compressor will stop operating. After a 200s delay, the IDU will display the "P8" error code. 1) In Cooling or Dry mode: ODU ambient temperature: OAT < -4°F(-20°C) or OAT > 145°F(63°C) 2) In Heating mode: a.
  • Page 59 Air Conditioner Service Manual 16) P9 --- Compressor Driving Protection (Compressor Load Abnormal) When the compressor starts up or in the process of operation, if: 1) The MCU can’t test the feedback signal from the compressor, or 2) Tested an abnormal signal from the compressor, or 3) The compressor startup is abnormal.
  • Page 60 Air Conditioner Service Manual 17) F4 --- Cooling System Gas Flow Abnormal Protection When the compressor starts up, the unit will check the variation of the IDU coil temperature. If the installer forgets to open the 2-way or 3-way valve on the ODU, the gas can’t flow in the cooling system. The unit will undergo cooling system gas flow abnormal protection and display the "F4"...
  • Page 61 Air Conditioner Service Manual 18) F5 --- PFC Protection If the system undergoes PFC over-current protection, the unit will display the "F5" error code. Display F5 Check the power supply. Is it Display F5 by abnormal? (This is normal random? protection) Display F5 frequently Switch Off the unit for 3 min.
  • Page 62 Air Conditioner Service Manual 19) F6 --- Compressor Lack of Phase / Anti-Phase Protection If the ODU PCB can’t test one or even three phases of the compressor's current, the unit will undergo anti-phase protection and display the "F6" error code. Display F6 Check the compressor wiring...
  • Page 63 Air Conditioner Service Manual 20) F7 --- Module Temperature Protection If the IPM temperature is more than 203°F(95°C), the system will undergo IPM over-temperature protection and display the “F7” error code. Display F7 Clean or adjust the gap Is the IPM well- Is there any dust or between the IPM and heat connected to the heat...
  • Page 64 Air Conditioner Service Manual 21) F8 --- 4-Way Value Reversing Abnormal In Heating mode, if the IDU coil temperature is measured at 41°F/5°C (room temperature) or lower after the compressor operates for 8 min, the unit will display the "F8" error code. Display F8 Is the 4-way valve Reconnect...
  • Page 65 Air Conditioner Service Manual 22) Fy --- Gas Leakage Protection After the compressor operates at high frequency for 9 min, if the IDU evaporator and ODU condenser temperatures show only minor variations compared to previous readings but the compressor discharge temperature remains high, the unit will display the "Fy"...

  • Page 66: Idu And Odu Disassembly

    Air Conditioner Service Manual 4. IDU and ODU Disassembly 4.1 IDU Disassembly Steps Reference Photo Before disassembly 1. Disassemble the front panel and display PCB A. Open the front panel. B. Unfix the screw on the electric control box cover, then remove the cover.
  • Page 67 Air Conditioner Service Manual 3. Remove the filter A. Remove the filter from the unit in the direction shown in the photo. Press the 2 holding buttons on the filter in order to remove it easily. 4. Remove the small vane A.
  • Page 68 Air Conditioner Service Manual 6. Disassemble the middle frame A. Remove the 7 screws on the mid frame. B. Lift the mid frame to loosen the first frame locker in the direction shown in the photo. (4 lockers in total) C.
  • Page 69 Air Conditioner Service Manual 9. Disassemble the stepping vane assembly A. Loosen the 6 vane lockers, then remove the vane assembly from the unit. 10. Disassemble the electric box A. Unfix the screws on the electric box and unit base. B.
  • Page 70 Air Conditioner Service Manual 12. Disassemble the installation plate and pipe clamp A. Unfix the screws on the installation plate and unit base. B. Loosen the lockers on the plate and base, then remove the installation plate. C. Slightly lift the hand clasp, then remove the clamp.
  • Page 71 Air Conditioner Service Manual 15. Remove the cross-flow fan and fan motor A. Lift the cross-flow fan and fan motor and move them to the right. Remove the cross-flow fan shaft out of the bearing. Then take out the cross-flow fan and fan motor from the unit.

  • Page 72: Odu Disassembly

    Air Conditioner Service Manual 4.2 ODU Disassembly Steps Reference Photo Before disassembly 1. Remove the handle and top cover Remove the handle by unfixing the screw between the handle and the right plate Unfix the screws on the top cover, front panel, left panel, right panel, then take off the top cover.
  • Page 73 Air Conditioner Service Manual 2. Disassemble the fan guard and front panel Unfix the screws on the front panel of the fan guard. Then turn the fan guard anticlockwise to remove it from the unit. Unfix the screws between the top cover of the ODU middle separate plate and the base...
  • Page 74 Air Conditioner Service Manual Unfix the screws on the left plate, base plate, and condenser plate. Then take out the left plate. 4. Disassemble the axis fan blade Unscrew the fan blade nut. Then remove the fan blade from the fan motor.
  • Page 75 Air Conditioner Service Manual 6. Remove the soundproof cotton Remove the soundproof cotton from the compressor carefully. 7. Disassemble the partition plate Unfix the screw between the separate plate and unit, then remove it from the unit.
  • Page 76 Air Conditioner Service Manual 8. Disassemble the gas and liquid valves Unfix the screws between the valve support plate and the unit. Then remove it from the unit by welding. Notes: 1) Before welding, release all the refrigerant in the unit.
  • Page 77 Air Conditioner Service Manual 11. Disassemble the fan motor and fan support Unfix the screws between the fan support and base plate, then remove the support from the unit. Loosen the metal cable clamps on the back of the fan support.

  • Page 78: Appendix

    84.2 Appendix 2 Pipe Length and Gas Charging Connecting pipes size and length for installation Pipe Size (Inch) Model Liquid ¼ ⅜ WYT012GLUI25FV Indoor Unit Outdoor Unit Pipe length is Pipe length is 49 ft/15m max 49ft/15m max Indoor Unit Outdoor Unit Refrigerant piping Max.
  • Page 79 Air Conditioner Service Manual B. Burrs Removal 1) Completely remove all the burrs from the cut cross section of the pipe/tube. 2) Put the end of the copper tube/pipe in a downward direction while removing the burrs in order to avoid dropping burrs into the tubing.

  • Page 80: Appendix 4 Thermistor Temperature Characteristics

    Air Conditioner Service Manual Appendix 4 Thermistor Temperature Characteristics Indoor Unit and Outdoor Exchange Temperature and Outside Air Temperature Sensor Temperature Characteristics Temp. Resistance Voltage of Temp. Resistance Voltage of Temp. Resistance Voltage of (k Ohm) Resistance (k Ohm) Resistance (k Ohm) Resistance °F(°C)
  • Page 81 Air Conditioner Service Manual Resistance at 77°F(25°C): 5 kΩ. TH1: Indoor room temperature sensor and outside air temperature sensor TH2: Indoor exchange temperature sensor and outside exchange temperature sensor Before measuring the resistance, disconnect the connectors as shown above. Outdoor Unit Sensor Temperature Characteristics Temp.
  • Page 82 Air Conditioner Service Manual 18(-8) 85.99 95.68 106.3 115(46) 7.908 8.38 8.872 212(100) 1.284 1.335 1.387 19(-7) 81.75 90.86 100.8 117(47) 7.612 8.06 8.526 214(101) 1.245 1.296 1.348 21(-6) 77.74 86.31 95.74 118(48) 7.328 7.754 8.196 216(102) 1.209 1.258 1.309 23(-5) 73.94 82.01...
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