Pioneer YN020GLSI24M2G Service Manual
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Pioneer YN020GLSI24M2G Service Manual

Pioneer YN020GLSI24M2G Service Manual

Multi inverter air conditioner
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Multi Inverter Air Conditioner
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YN020GLSI24M2G
YN040GLSI24M4G
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Summary of Contents for Pioneer YN020GLSI24M2G

  • Page 1 Air Conditioner Service Manual Multi Inverter Air Conditioner Service Manual Models: YN020GLSI24M2G YN030GLSI24M3G YN040GLSI24M4G YN050GLSI24M5G...

  • Page 2: Table Of Contents

    Air Conditioner Service Manual CONTENTS 1. Technical Information ......................2 1.1 Summary ............................2 2. Unit Dimension ........................3 2.1 ODU Dimension ..........................3 2.2 IDU Dimension ..........................4 3. Refrigerant System Diagram ....................6 4. Electrical Parts ........................7 4.1 Wiring Diagram ..........................

  • Page 3: Technical Information

    Air Conditioner Service Manual 1. Technical Information 1.1 Summary Outdoor Unit YN040GLSI24M4G YN020GLSI24M2G YN050GLSI24M5G YN030GLSI24M3G...

  • Page 4: Unit Dimension

    Outdoor Unit Dimensions inch (mm) inch (mm) Outdoor Model W x H x D YN020GLSI24M2G 36½ x 27½ x 14¾ (927 x 699 x 375) 23⅛ (586) 13¾ (348) 38¾ x 31¾ x 16¼ (984 x 804 x 412) YN030GLSI24M3G 23⅞...

  • Page 5: Idu Dimension

    Air Conditioner Service Manual 2.2 IDU Dimensions Cassette Dimensions Unit: inch (mm) Model 9-18K 9⅝ (245) 5⅛ - 5¼ (130-135) 9⅝ (245) 5⅛ - 5¼ (130-135)

  • Page 6: Indoor Unit

    Air Conditioner Service Manual Ductable Concealed Unit: inch (mm) Outline Dimension Air Return Opening Size Mounted Lug Size Air Outlet Opening Size Model 9~12K 27⅝ (700) 7⅞ (200) 19¼ (490) 17¾ (450) 1¾ (45) 20⅛ (510) ¾ (17) 5½ (140) 23⅝...

  • Page 7: Refrigerant System Diagram

    Air Conditioner Service Manual 3. Refrigerant System Diagram The schematic diagram of the Free Match Series Inverter Heat Pump System: Reference: YN050GLSI24M5G PMV1 TIN1 PMV2 TIN2 PMV3 TIN3 PMV4 TIN4 PMV5 TIN5 Condenser T2B1 T2B2 T2B3 T2B4 T2B5 Liquid storage port Optional...

  • Page 8: Electrical Parts

    Air Conditioner Service Manual 4. Electrical Parts 4.1 Wiring Diagram Outdoor Unit YN020GLSI24M2G YN030GLSI24M3G...
  • Page 9 Air Conditioner Service Manual YN040GLSI24M4G YN050GLSI24M5G...

  • Page 10: Odu Pcb Printed Diagram

    Air Conditioner Service Manual 4.2 ODU PCB Printed Diagram Model Numbers: YN020GLSI24M2G | YN030GLSI24M3G | YN040GLSI24M4G Top view: 4-way valve Heater L, N and communication Fuse ODU PCB main relay DC and AC motor connector Discharge sensor connector OAT/OPT sensor...
  • Page 11 Air Conditioner Service Manual Model Numbers: YN050GLSI24M5G Top view: 4-way valve Heater L, N and communication Fuse ODU PCB main relay DC and AC motor connector Electronic expansion valve Discharge sensor connector OAT/OPT sensor connector 10 LED5 Bottom view:...

  • Page 12: Function And Control

    Air Conditioner Service Manual 4.3 Function and Control 1) Cooling Mode Operation Compressor Frequency Control According to the difference of the room temperature and set temperature (δt = RT-ST), the running frequency of the compressor is controlled by the electric controller. When the room temperature is considerably higher than the set temperature, the compressor will start operating at a high frequency.

  • Page 13: Frequency Control

    Air Conditioner Service Manual 3) Heating Mode Operation (Heat Pumps Only) Frequency Control Similarly to the frequency control in Cooling mode, the running frequency of the compressor is managed by the remote controller. The unit changes its running frequency according to δt, making the room temperature closer to the set temperature.
  • Page 14 Air Conditioner Service Manual Outdoor Fan Motor Control In Heating mode, the outdoor fan will power On 5s ahead of the compressor, and cut Off 30s later than the compressor. Outdoor fan motor Compressor Defrosting Defrosting is controlled by the microprocessor. When the unit operates for 30 min total, the compressor operation is more than 3 min continuously, and one of the following conditions are met, the unit will enter the Defrosting mode: •...
  • Page 15 Air Conditioner Service Manual In Defrosting mode, the LED display shows the mode by blinking. Regardless of when the AC enters or exits Defrosting mode, the indoor fan motor speed remains the same as the Cold Air Prevention Control. If one of the following conditions are met, the units exits Defrosting mode, and changes to Heating mode: •...
  • Page 16 Air Conditioner Service Manual 7) Auto-Restart Pre-Setting (Optional) If the Auto-Restart function is needed, follow these steps to activate this function: a. Pull the air-con's plug out of the socket. b. Press and hold the emergency button (On/Off) on the indoor unit. Then insert the plug into the socket again. c.

  • Page 17: Protection Function

    Air Conditioner Service Manual Protection Function 1) Mode Conflict Protection for the Indoor Units When the setting mode is different for each indoor unit, the system runs in the following status: A. The system mode is determined by the indoor unit that turns On first, except if the indoor unit is in Fan mode. Cooling/Drying mode conflicts with Heating mode.

  • Page 18: Installation Manual

    Air Conditioner Service Manual 5. Installation Manual 5.1 Installation for Service 1) Check the information in this manual to find out the dimensions of the space needed for proper installation of the device, including the minimum distances allowed compared to adjacent structures. 2) The appliance must be installed, operated, and stored in a room with a floor area larger than 13.1 ft (4m).

  • Page 19: Servicing Information

    Air Conditioner Service Manual 16) Servicing Information: Inspect the Area Before working on systems containing flammable refrigerants, safety checks are required to ensure the risk of ignition is minimized. The following precautions must be complied with prior to conducting repairs on the system. Work Procedure To minimize the risk of flammable gas or vapor presence, you must conduct work using controlled procedures.
  • Page 20 Air Conditioner Service Manual Well-Ventilated Area Ensure the area is open and well-ventilated before accessing the system or performing any work that generates heat. Ventilation must be maintained to a certain degree while work is being carried out. The ventilation should safely disperse any released refrigerant and expel it externally into the atmosphere.
  • Page 21 Air Conditioner Service Manual 18) Repairs to Intrinsically Safe Components Do not apply permanent inductive or capacitive loads to the circuit unless they are within the equipment's permissible voltage and current limits. Intrinsically safe components are the only types of components that can be worked on while in the presence of a flammable atmosphere.
  • Page 22 Air Conditioner Service Manual 23) Decommissioning Before carrying out this procedure, the technician must be completely familiar with the equipment and its details. It is recommended to safely recover the refrigerants. Before recovering the refrigerant, take an oil and refrigerant sample in case analysis is required for reusing reclaimed refrigerant. Ensure electrical power is available when completing this procedure.

  • Page 23: Installation Precautions

    Air Conditioner Service Manual 5.2 Installation Precautions Important Considerations • The air conditioner must be installed by professional personnel. The installation manual is only intended to be used by professional installation personnel. The installation specifications should be subject to our after- sale service regulations.

  • Page 24: Installation Safety

    Air Conditioner Service Manual Installation Safety Refrigerant Leak Detector  The left picture is the schematic diagram of Appropriate Installation  a refrigerant leak detector. Location Caution: • Installation should occur in a well-ventilated location. • When using refrigerant R454B during installation or maintenance, the location should be free from open fire, welding, smoking, drying oven, or any other goods with temperatures higher than 548°F(286.7°C).
  • Page 25 Air Conditioner Service Manual Safety Rules and Recommendations for the Installer • Read this guide before installing and using the appliance. • During the installation of the indoor and outdoor units, restrict children from accessing the working area. Unforeseeable accidents may occur. •...
  • Page 26 Air Conditioner Service Manual • This appliance has been made for domestic air conditioning environments. Do not use the appliance for any other purpose, such as drying clothes, cooling food, etc. • To prevent dust and waste accumulation, always use the appliance with the air filter mounted. Operating the appliance without the filter may lead to malfunctions.

  • Page 27: Safety Rules And Prohibitions

    Air Conditioner Service Manual Safety Rules and Prohibitions • Do not bend, tug, or compress the power cord because this could cause damage. A damaged power cord can possibly cause electrical shocks or fire. Only specialized technical personnel can replace a damaged power cord.

  • Page 28: Installation Preparation

    Air Conditioner Service Manual 5.3 Installation Preparation Notes for Installation and Maintenance Read the safety precautions carefully before installation and maintenance. The following contents are important for installation and maintenance. Follow the instructions below: • The installation or maintenance must accord with the instructions. •...
  • Page 29 Air Conditioner Service Manual Warnings Electrical Safety Precautions • Turn Off the air conditioner's power supply before checking and starting maintenance. • The air conditioner must apply a specialized circuit. Prohibit sharing the same circuit with other appliances. • The air conditioner should be installed in a suitable location. Ensure the power plug is touchable. •...

  • Page 30: Selection Of The Installation Location

    Air Conditioner Service Manual Selection of the Installation Location Installation Safety Precautions • Select the installation location according to the requirements of this manual. (See the requirements in the Installation section). • Handle unit transportation with care. The unit should not be carried by only 1 person if it is more than 44 lbs (20kg).
  • Page 31 Air Conditioner Service Manual 1) One outdoor unit installed inch (mm) Hb / Hd / H —— —— ≥ 3⅞ (100) —— —— —— A, B, C —— —— —— ≥ 3⅞ (100) ≥ 11¾ (300) ≥ 3⅞ (100) B, E ——...
  • Page 32 Air Conditioner Service Manual 2) Two or more outdoor units installed side-by-side. inch (mm) Hb / Hd / H ≥ 11¾ ≥ 11¾ A, B, C —— —— ≥1000 —— (300) (300) ≥ 39⅜ ≥ 11¾ ≥ 11¾ A, B, C, E ≥1000 ——...
  • Page 33 Air Conditioner Service Manual 3) Outdoor units installed in rows. Hb/H inch (mm) Hb≤1/2H b≥ 9¾ 250 1/2H<Hb≤H b≥ 11¾ 300 Hb>H Prohibited 4) Outdoor units installed one above another.
  • Page 34 Air Conditioner Service Manual Installation Space and Indoor Unit Location Diagram Notice: For the best performance of the indoor unit, ensure its installation space conforms to the following installation dimensions. 1. Cassette 2. Duct 3. Ceiling Floor...

  • Page 35: Indoor Unit Installation

    Air Conditioner Service Manual 5.4 Unit Installation Indoor Unit Installation A. Cassette Preparation Work on the Ceiling: • The installation height between the ceiling and floor must be greater than 8.2 ft (2.5m). • Change the installation method based on the construction structure. Consult professionals for detailed information.
  • Page 36 Air Conditioner Service Manual Overhanging the Indoor Unit Cassette: Adjust the gasket (downside) to 3.5 inches (90mm) over the ceiling. Compact cassette: Adjust the gasket (downside) to 2.4 inches (62mm) over the ceiling. New Concrete Bricks Inlay or embed the screw bolts. Steel Roof Beam Structure Install the supporting angle steel.

  • Page 37: Panel Installation

    Air Conditioner Service Manual Panel Installation Complete the panel installation after the piping and wiring is finished. Before installation, confirm the indoor unit and ceiling hole installation size is correct. Caution: Be sure to seal the connection parts between the panel-ceiling and the panel-indoor unit. Seal the small gaps too, as they may cause wind/water leakage or condensing water.
  • Page 38 Air Conditioner Service Manual 1) Screw 2 M5*20 bolts at opposite angles of the indoor unit. Before fixing the screws, determine the orientation of the panel. Align the positioning holes on the panel with the positioning pins on the box. 2) Connect the step motor and display board wires to the electrical box according to the Electric Wiring diagram on the electrical box.
  • Page 39 Air Conditioner Service Manual 1) Screw the M10 gasket and M6*20 bolt at the corner of the indoor unit. Before fully fastening them, screw the other additional bolts, which are shown in red in the figure. Notice that the direction of the red arrows on the electrical box aligns with the one on the panel.
  • Page 40 Air Conditioner Service Manual Choice of Air Return Ways The indoor unit is fitted with the downward air return, which can be changed to its backward counterpart if necessary. Follow these steps to change the air return direction to backward. 1) Air return downward 2) Loosen the nut and dismantle the flannel plate and filter.
  • Page 41 Air Conditioner Service Manual Hanging & Installation of the Indoor Unit 1) Adjust the Nut Position While There is a Gap Between the Gasket (Downside) and Ceiling. • Hang the nut inside the U slot of the installation panel. • Confirm the level degree with a gradienter. Leaning the unit downside toward the non-draining side is prohibited.
  • Page 42 Air Conditioner Service Manual 4) Tips for Installation of the Return Air Pipe and Outlet Pipe • To minimize energy loss occurring in the transmission process and condensed water during the heating operation, equip the return air pipe and outlet pipe with a heat-insulating layer as shown in the figure.

  • Page 43: Installation Procedure

    Air Conditioner Service Manual C. Floor-Ceiling Flex Installation Procedure Remove the grille and sideboard. Floor Console Type 1) Select the Piping and Drainage Directions The piping and drainage can be set in 2 directions as shown below. After selecting the direction, drill a 3.9 inch (100mm) diameter hole in the wall.
  • Page 44 Air Conditioner Service Manual Use a concrete drill to create two 0.4 inch (10mm) diameter holes in the A and B positions on the wall. Insert the anchor bolts into the drilled holes, then drive the pins completely into the anchor bolts with a hammer. Install the unit using witmuts, washers, and spring washers.
  • Page 45 Air Conditioner Service Manual Under Ceiling Type 1. Select the Piping and Drain Directions Caution: Install the drainage hose at the rear of the unit. Do not install the drainage hose at the top of the unit. After selecting the directions, drill 3.1 inch (80mm) and 2 inch (50mm) or 5.9 inch (150mm) diameter holes in the wall so that the hole is tilted downward toward the outside for smooth water flow.

  • Page 46: Outdoor Unit Installation

    Air Conditioner Service Manual Outdoor Unit Installation 1. Select the Installation Location 1) Do not install the outdoor unit near sources of heat, steam, or flammable gas. 2) Do not install the unit near an area that is too windy or dusty. 3) Do not install the unit in a location where people often pass.
  • Page 47 Air Conditioner Service Manual 3. Fasten the Outdoor Unit 1) Mark the installation positions for the expansion bolts according to the outdoor unit installation dimensions. 2) Drill holes and clean the concrete dust. Then place the bolts. 3) If necessary, install 4 rubber blankets on the hole before placing the outdoor unit (optional). This will reduce vibrations and noise.
  • Page 48 Air Conditioner Service Manual 5. Connecting the Refrigerant Pipe 1) Unscrew the valve cover. Grasp and press the wiring cover down gently to remove it. 2) Remove the protective caps from the end of the valves. 3) Remove the plastic cover in the pipe ports. Check whether there is any sundry on the port of the connecting pipe.
  • Page 49 Air Conditioner Service Manual 6. Vacuum Pumping (2-Zone System) 1) Use a spanner to remove the protective caps from the service port, low pressure valve, and high pressure valve of the outdoor unit. 2) Connect the pressure hose of the manifold gauge to the service port on the outdoor unit's low pressure valve.

  • Page 50: Preparations And Precautions

    Air Conditioner Service Manual Vacuum Pumping (3/4/5 Zone System) Preparations and Precautions Air and foreign matter in the refrigerant circuit may cause abnormal rises in pressure, which can damage the air conditioner, reduce its efficiency, or cause injury. Use a vacuum pump and manifold gauge to evacuate the refrigerant circuit, removing any non-condensable gas and moisture from the system.
  • Page 51 Air Conditioner Service Manual 4) Open the low pressure side valve on the manifold gauge. Keep the high pressure side valve closed. 5) Turn On the vacuum pump to evacuate the system. 6) Run the vacuum until the compound meter reads -76cmHg/-29.92"Hg (-101 kPa). Using a micron gauge is recommended.
  • Page 52 Air Conditioner Service Manual Pipe Length and Additional Refrigerant Outdoor Side Drain Pipe • Install the outdoor unit on a solid wall and securely fasten it. • Before connecting the pipes and cables, decide the best position on the wall and leave sufficient space for maintenance.

  • Page 53: Electrical Installation

    Air Conditioner Service Manual 5.5 Electrical Installation Cable Connection Between the IDU and ODU Plug the connection cables to the corresponding terminals, as shown below. For example, Terminal (A) of the outdoor unit must connect with Terminal (A) of the indoor unit. 1) Connect to the internal and external communication lines.

  • Page 54: Test Run

    Air Conditioner Service Manual 5.6 Test Run Inspections before the test run. Complete the following checks before the test run: Inspection Method Description • Check whether the power supply voltage complies with the specifications. Electrical Safety Inspection • Check whether there is any wrong or missing connections between the power lines, signal line, and earth wires.
  • Page 55 Air Conditioner Service Manual Test Running Instructions 1. Turn On the power supply. 2. Press the On/Off button on the remote controller to turn On the air conditioner. 3. Press the Mode button to switch the modes to Cooling or Heating. In each mode, set as below: Cooling - Set the lowest temperature Heating - Set the highest temperature...

  • Page 56: Troubleshooting Guide

    Air Conditioner Service Manual 6. Troubleshooting Guide 6.1. Error Codes 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 57 Air Conditioner Service Manual Communication failure for Top flow unit / Check the troubleshooting for details Preset mode conflict (IDU failure) Infrared customer feeling test sensor failure (IDU Query by pressing the remote controller failure) Electric power test module failure (IDU failure) Query by pressing the remote controller Discharge temperature sensor failure protection Check the troubleshooting for details...
  • Page 58 Air Conditioner Service Manual Malfunction Possible Causes Power failure or plug pulled out. Damaged indoor/outdoor unit fan motor. Faulty protective device or fuses. Faulty compressor thermo-magnetic circuit breaker. The Appliance Does Not Loose connections or plug pulled out. Operate It sometimes stops operating to protect the appliance. Voltage higher or lower than the voltage range.

  • Page 59: Troubleshooting

    Air Conditioner Service Manual 6.2 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 60 Air Conditioner Service Manual 2) E1, E2 --- IDU Room Temperature Sensor and/or Coil Temperature Sensor Failure Start Display E1 or E2 Is the sensor well- Reconnect connected to the PCB? E1/E2 disappear? Multimeter check the sensor. Is it experiencing a Replace the sensor short circuit or an open circuit fault?
  • Page 61 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 E6 disappear?
  • Page 62 Air Conditioner Service Manual 4) E3, E7, E8, EH, En, or Ey --- ODU Coil Temperature Sensor Failure Ambient Temperature Sensor Failure Discharge Temperature Sensor Failure Suction Temperature Sensor Failure Gas Pipe Temperature Sensor Failure Liquid Pipe 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", "E8", "EH", "En", or "Ey".
  • Page 63 Air Conditioner Service Manual 5) E9 --- ODU IPM / Compressor Drive Fault If the unit stops working 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 the ODU PCB...
  • Page 64 Air Conditioner Service Manual 10) EF --- ODU DC Fan Motor Failure Shut Off Check the fan blade by Reinstall the DC motor hand. Can it rotate freely? Works normal? Is the fan motor well- Reconnect connected to the PCB? Works normal? 1.
  • Page 65 Air Conditioner Service Manual 11) EU --- ODU Voltage Test Sensor Failure After the power relay begins working, 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 66 Air Conditioner Service Manual 12) 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 67 Air Conditioner Service Manual 13) 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 68 Air Conditioner Service Manual 14) 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 69 Air Conditioner Service Manual 15) P4 --- ODU Discharge Temperature Overheating Protection Display P4 Is the ODU temperature higher Normal protection than 140°F(60°C)? Is the ODU Is the unit Adjust ODU Enough space for location operating? ventilation? installation acceptable? Condenser too Clean the IDU filter or P4 disappear? dirty? or filter...
  • Page 70 Air Conditioner Service Manual 16) 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.
  • Page 71 Air Conditioner Service Manual 17) 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 72 Air Conditioner Service Manual 18) 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...
  • Page 73 Air Conditioner Service Manual 19) 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 74 Air Conditioner Service Manual 20) 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 75 Air Conditioner Service Manual 22) 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 76 Air Conditioner Service Manual 23) F5 --- PFC Protection If the system undergoes PFC over-current protection, the unit will display the "F5" error code. F5 Code Check the power supply. Is Display F5 by it abnormal? (This is normal random? protection) Display F5 frequently Switch Off the unit for...
  • Page 77 Air Conditioner Service Manual 24) 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 78 Air Conditioner Service Manual 25) 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 79 Air Conditioner Service Manual 26) 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 wiring connection...
  • Page 80 Air Conditioner Service Manual 29) Fy, E4 --- Gas Leakage Protection and Abnormal AC Cooling System 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 81 Air Conditioner Service Manual 30) H1, H2 --- High Pressure Switch Failure and Low Pressure Switch Failure 1. The high-pressure switch is installed at the discharge pipe of the system. When the pressure on the high- pressure side of the system exceeds the preset protection value, the protection mechanism is triggered. The "H1" error code displays.

  • Page 82: Indoor And Outdoor Unit Disassembly

    Air Conditioner Disassembly Manual 7. Indoor and Outdoor Unit Disassembly 7.1 Outdoor Unit Disassembly Outdoor Unit Model Numbers: YN020GLSI24M2G | YN030GLSI24M3G | YN040GLSI24M4G | YN050GLSI24M5G Steps Reference Photo Before disassembly 1: Remove the PCB cover, valve cover, and top cover 1).
  • Page 83 Air Conditioner Disassembly Manual 2. Disassemble the fan guard and front panel Remove the grille screws from the front panel, then take out the grille. 1). Unfix the screws on the front panel of the fan guard. 2). Separate the ODU middle plate and base plate.
  • Page 84 Air Conditioner Disassembly 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. Remove the blade. 5. Disassemble the electric box Unfix the screws on the electric box and motor supporter.
  • Page 85 Air Conditioner Disassembly Manual 6. Remove the noise cotton Take the noise cotton out. 7. Disassemble the separate plate Unfix the screw on the separate plate and unit, then take it out. 8. Disassemble the 2-way and 3-way valve Unfix the screws on the valve plate and base.
  • Page 86 Air Conditioner Disassembly Manual 9. Disassemble the 4-way valve assembly Remove the 4-way valve from the system by welding. Ensure there is no damage to the compressor, nameplate, etc. 10. Disassemble the compressor Unscrew the nuts and remove the compressor. 11.

  • Page 87: Indoor Unit Disassembly

    Air Conditioner Disassembly Manual 7.2 Indoor Unit Disassembly Ceiling Cassette Indoor Unit Model Numbers: CT009GLSILCFHG | CT012GLSILCFHG | CT018GLSILCFHG | CT024GLSILSFHG Steps Reference Photo Before disassembly 1. Remove the seal plate and drain spout A. Disassemble the seal plate. B. Remove the drain spout. 2.
  • Page 88 Air Conditioner Disassembly Manual 4. Remove the base foam assembly Remove the base foam assembly. 5. Dismantle the water pump assembly Dismantle the water pump assembly. Take out the water pump in the same direction shown in the photo. 6. Dismantle the evaporator assembly Dismantle the evaporator assembly.
  • Page 89 Air Conditioner Disassembly Manual 8. Disassemble the DC motor Disassemble the DC motor. 9. Remove the centrifugal fan Remove the centrifugal fan. 10. Remove the panel assembly Unfix the screws on the panel and drainage assembly. Remove the panel assembly 11.
  • Page 90 Air Conditioner Disassembly Manual 12. Remove the electric box assembly Unfix the screws on the electric control box, water tray assembly, and air guide in the direction shown in the photo. Remove the electric control box assembly. 13. Disassemble the air guide parts Unfix the screws on the guide parts and water tray.
  • Page 91 Air Conditioner Disassembly Manual Ductable Concealed Indoor Unit Model Numbers: RT009GLSILCFHG | RT012GLSILCFHG | RT018GLSILCFHG | RT024GLSILSFHG Steps Reference Photo Before disassembly 1. Disassemble the filter assembly Disassemble the filter assembly. Remove the filter. 2. Disassemble the base part and air return plate A.
  • Page 92 Air Conditioner Disassembly Manual 3. Disassemble the front panel assembly Unfix the screws on the front panel, then remove the assembly. 4. Remove the electrical box cover and hooks A. Unfix the screws on the electrical box cover, then remove the cover. B.
  • Page 93 Air Conditioner Disassembly Manual 7. Disassemble the right side plate and drainage mounting assembly A. Unfix the screws between the right side plate, evaporator end plate, top plate, and drain mounting assembly. Then remove the right side plate. B. Remove the drain nozzle on the drain mounting assembly, then take out the assembly.
  • Page 94 Air Conditioner Disassembly Manual Floor-Ceiling Flex Indoor Unit Model Numbers: UT018GLSILCFHG | UT024GLSILSFHG Steps Reference Photo Before disassembly 1. Remove the front grille A. Remove the screws by pushing the buckles in the direction as shown in the photo. B. Open the grille. Then remove the grille from the back snap hook.
  • Page 95 Air Conditioner Disassembly Manual 4. Remove the front panel assembly Unfix the screws on the front panel. Then remove the panel assembly. 5. Remove the water tray Take out the water tray. 6. Remove the evaporator assembly Take out the evaporator.
  • Page 96 Air Conditioner Disassembly Manual 7. Remove the display panel and vane assembly Take out the display panel and vane assembly. 8. Remove the volute parts Remove the volute parts. 9. Disassemble the centrifugal fan Take out the centrifugal fan. 10. Disassemble the fan motor Remove the fan motor.

  • Page 97: Wall Mounted

    Air Conditioner Disassembly Manual Wall Mounted Indoor Unit Model Numbers: WT009ALSI24HLG | WT012ALSI24HLG | WT009GLSI24HLG | WT012GLSI24HLG | WT018GLSI24HLG | WT024GLSI24HLG Steps Reference Photo Before disassembly 1. Disassemble the front panel, display board, and wireless network module Display A. Open the front panel. B.
  • Page 98 Air Conditioner Disassembly Manual 3. Remove the electric control box cover Unfix 1 screw on the electric box cover, then remove the cover. 4. Remove the filter Push the filter slightly upwards. You can take the filter out from the unit.
  • Page 99 Air Conditioner Disassembly Manual 6. Disassemble the electric control box Electric control A. Remove the RT and IPT from the evaporator. B. Unscrew all the earth ground wirings on the evaporator. C. Take all the connectors out from the PCB. D.
  • Page 100 Air Conditioner Disassembly Manual 8. Disassemble the evaporator Screws Screws + A. Unfix 2 screws on the left side. Motor cover B. Unfix 2 screws on the right side of the motor cover/right support plate. C. Take the evaporator out from the unit by uplifting the input/output pipes slightly.

  • Page 101: Thermistor Temperature Characteristics

    Air Conditioner Service Manual 8. Thermistor Temperature Characteristics Indoor Unit and Outdoor Exchange Temperature and Outside Air Temperature Sensor Temperature Characteristics R min R(t) R max R min R(t) R max R min R(t) R max Temp. Temp. Temp. (k Ohm) (k Ohm) (k Ohm) (k Ohm)
  • Page 102 Air Conditioner Service Manual 50(10) 8.909 9.172 9.441 142(61) 1.372 1.419 1.467 234(112) 0.327 0.342 0.357 8.545 8.792 9.044 1.328 1.374 1.421 0.319 0.333 0.349 52(11) 144(62) 235(113) 54(12) 8.199 8.431 8.667 1.287 1.332 1.378 237(114) 0.311 0.325 0.340 145(63) 55(13) 7.870 8.087...
  • Page 103 Air Conditioner Service Manual 196(91) 125.417 143.022 160.627 10.777 11.531 12.248 1.690 1.749 1.808 5(-15) 100(38) 7(-14) 118.921 135.407 151.893 102(39) 10.357 11.071 11.784 198(92) 1.637 1.695 1.754 9(-13) 112.794 128.236 143.679 104(40) 9.955 10.631 11.307 199(93) 1.586 1.644 1.701 10(-12) 106(41) 201(94)
  • Page 104 Air Conditioner Service Manual R—Resistance Resistance at 77°F(25°C): 20 kΩ TH3: Outdoor unit discharge pipe sensor Before measuring the resistance, disconnect the connectors as shown above.
  • Page 105 7290 NW 77 Court, Miami, FL 33166 - USA : (305) 513-4488 : (305) 513-4499 E-mail : info@pdhvac.com Website: www.pdhvac.com Pioneer product line, parts, and supplies are available online for convenient ordering at: www.highseer.com www.pioneerminisplit.com Scan the below code to visit our support page where you can find more installation materials: Copyright ©...

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