This document provides a comprehensive service manual for a Wall Mounted Type DC Inverter air conditioner, specifically Model No. GES-NX2G25IN, and also includes removal procedures for the SERIES:25N model. The manual is intended for experienced repair technicians.
Function Description
The device is a domestic air conditioner with both cooling and heating capabilities. It utilizes DC Inverter technology, specifically A-PAM (S-TYPE, S-PAM, and PHASE control), to ensure stable operation at low frequencies, energy efficiency, and powerful performance at high frequencies. The unit offers various operational modes and features designed for user comfort and convenience.
Important Technical Specifications
The nominal distribution system voltage is 230V at 50Hz, single phase.
Cooling Specifications:
- Capacity rated: 2.6 KW (1.0-3.5) or 8870 Btu/h (3400-11950)
- Power Consumption (Rated): 0.81 KW
- SEER/SCOP: 6.2 W/W
- Annual energy consumption: 147 KWh
- Moisture Removal: 1.2 x 10⁻³ m³/h
Heating Specifications:
- Capacity rated: 2.8 KW (1.0-4.4) or 9550 Btu/h (3420-15020)
- Power Consumption (Rated): 0.75 KW
- SEER/SCOP: 4.0 W/W
- Annual energy consumption: 841 KWh
General Technical Specifications:
- Dimensions (HWD): 842 x 211 x 281 mm
- Packaged Dimensions (HWD): 909 x 279 x 355 mm
- Weight: 9.7 KG
- Gross weight: 12 KG
- Color: White
- Sound level (pressure Hi/Mid/Lo): 36/30/26 dB(A) for both cooling and heating
- Sound power (high): 53 dB(A) for both cooling and heating
Parts Specifications:
- Fan Type: Cross flow fan
- Motor Power: 20 W (both cooling and heating)
- Air flow rate (high): 500 m³/h
- Fan Speed (Hi/Mid/Lo): 1100/950/800 rpm for cooling, 1000/850/700 rpm for heating
- Heat exchanger type: ML fin-Φ7HI-HX tube, 3121.4 segment stagefitch
- Air direction control: Horizontal, Downward
- Air filter: Removable/Washable/Mildew Proof
- Temperature control: Microcomputer Control
- Remote controller model: YR-HM
- Sensors: Room and pipe sensor (1 unit), used for detecting room and evaporator temperature.
- Room sensor: R25°C=23KΩ ±2%, B25°C/50°C=4200K±1%
- Pipe sensor: R25°C=10KΩ ±2%, B25°C/50°C=3700K±2%
Usage Features
- Super quiet: Designed for lower noise operation.
- Long distance air supplying: Capable of delivering air over 12 meters.
- Low-temperature heating: Can still heat naturally when ambient temperature is -15°C.
- 10°C heating maintenance: Maintains a 10°C temperature to prevent freezing.
- Comfortable sleep mode: Adjusts setting temperature and indoor noise for a more comfortable night's sleep.
- Super match: One outdoor unit can connect to two or more indoor units.
- DIY auto mode: Automatically adjusts to the last fixed operation mode.
- Turbo mode: Provides quick cooling or heating.
- Auto restart: Automatically returns to previous operating conditions after a power blackout.
- 24 hours timer: Allows setting on, off, or on-to-off/off-to-on timer functions.
- Intergrative valve cover: Features an integrated valve cover.
- 2-way piping design: Piping can exit from both the left or right side.
- Easy clean design: The panel is easy to wash, and airflow vents are easily detachable.
- Double 8 display: The display uses a Double 8 mode.
Operational Modes and Controls:
- Automatic Operation: The system determines the running mode (cooling or heating) based on room temperature (Tr). Cooling mode is selected if Tr ≥ 23°C, and heating mode if Tr < 23°C. Automatic conversion between cooling and heating modes has a 15-minute delay.
- Cooling Operation:
- Temperature control range: 16°C to 30°C, with a ±1°C difference.
- Compressor activates when Tr > Ts (set temperature) and stops when Tr < Ts.
- Airflow speed control: Automatic (high, medium, low based on Tr relative to Ts) or manual.
- Airgate location control: Adjustable.
- Defrosting function: Prevents frosting on the indoor heat exchanger during cooling/dehumidifying. Compressor stops if indoor coil temperature drops below 0°C for 10 seconds and restarts when it reaches 7°C (with a 3-minute delay).
- Timing system on/off function and Dormant control function are available.
- Dehumidifying Mode:
- Temperature control range: 16°C to 30°C, with a ±1°C difference.
- Compressor activates when Tr > Ts+2°C.
- High dehumidifying frequency for 10 minutes, then low for 6 minutes when Tr is between Ts and Ts+2°C.
- Indoor fan operates at low speed.
- Wind speed control: Automatic (high, medium, low, light speed based on Tr relative to Ts).
- Airgate location control: Adjustable.
- Defrosting function: Similar to cooling mode, prevents frosting on the indoor heat exchanger.
- Coil protection (synchronic overheating protection) for four directions latch malfunctions.
- Timing system on/off function and Dormant control function are available.
- Heating Operation:
- Temperature control range: 16°C to 30°C, with a ±1°C difference.
- Automatic temperature compensation.
- Outdoor compressor turns on if Tr ≤ Ts, indoor fan in cold air proof mode.
- Outdoor system turns off if Tr > Ts+1°C, indoor fan in heat residue sending mode.
- Indoor fan control: Manual (high, medium, low, automatic) or automatic (high, medium, low based on Tr relative to Ts).
- Airgate location control: Adjustable.
- Cold air proof operation: Initial 4 minutes of operation have specific airflow patterns, fan does not stop.
- Residue heat sending: Indoor fan sends residue heat at low speed for 12 seconds after compressor stops.
- Defrosting: Indoor fan stops, temperature display does not change. Coil malfunctions are neglected during defrost.
- Automatic heating temperature compensation (4) is added in heating mode.
- Strength Operation: Activates upon receiving a 'strength signal', sending a strength operation signal to the outdoor system.
- Mute Operation: Activates upon receiving a 'mute signal', setting airflow speed to slight. Not available in dehumidifying or airflow-sending operations.
- Air Refreshing: Activates Nano-Aqua for ion sending when the fan operates, indicated by a green 'health' logo or indicator light.
- Timing: 24-hour on/off timing with indicator light. Includes system on, system off, and system on and off timing.
- Dormant Operation: An eight-hour fixed dormant timing. In cooling/dehumidifying, set temperature increases by 1°C after 1 hour, then another 1°C after another hour, maintaining for 6 hours before closing. In heating, set temperature decreases by 2°C after 1 hour, then another 2°C after another hour, then increases by 1°C after 3 hours, maintaining for 3 hours before closing. Indoor fan speed adjusts during dormant operation.
- Urgent On/Off Input: Pressing the urgency button for less than 5 seconds activates urgent operation (fully automatic). Pressing for 5-10 seconds starts test operation. Pressing for 10-15 seconds displays the last malfunction resume.
- Low Load Protection Control: Stops the outdoor system if indoor heat interaction temperature is below 0°C for 5 minutes (fan continues). Restarts when temperature is above 7°C and system has been stopped for 3 minutes.
- High Load Protection Control: Stops the outdoor system if coil temperature is above 65°C for 2 minutes. Restarts when temperature is below 42°C and system has been stopped for 3 minutes.
- Abnormal Operation of Indoor System: Reports abnormal operation if indoor and outdoor system operations differ.
- Malfunction List Resume: Displays malfunction codes for 10 seconds. Resumes after power supply restores.
- Single Indoor System Operation: Allows the indoor unit to operate independently of outdoor communication signals.
- Power Cut Compensation: Stores the present system status into EEPROM to resume operation after a power cut.
- Test Program: A diagnostic program that checks various components and functions.
- Time Cutting Function: Speeds up the CPU of the main control by 60 times.
Maintenance Features
The manual provides detailed troubleshooting steps for various error codes and abnormalities, including:
- Thermistor or Related Abnormality (E1, E2, LED1 flashes 10-13 times): Checks for faulty connector connection, faulty thermistor, or faulty PCB. Includes a thermistor resistance check method.
- EEPROM Abnormal (E4, F12, LED1 flashes 1 time): Checks for data errors or damaged EEPROM. Solution is to replace the indoor or outdoor mainboard.
- Indoor AC Fan Motor Malfunction (E14): Checks for wire breaking, overheat protection, or detection errors. Involves checking terminals, measuring voltage, and verifying motor operation.
- Outdoor DC Fan Motor Fault (F8, LED1 flashes 9 times): Checks for faulty fan motor or PCB. Involves checking terminals, measuring resistances, and verifying motor operation.
- IPM Protection (F1, LED1 flashes 2 times): Checks for overcurrent, faulty compressor, or faulty PCB of IPM module. Involves testing IPM module resistance and checking for system over/under-charging or seized compressor shaft.
- Over-current of the Compressor (F2, LED1 flashes 3, 24, or 25 times): Checks for damaged IPM module, damaged compressor, or power supply issues. Involves checking power supply and system charge.
- Communication Fault between IPM and Outdoor PCB (F3, LED1 flashes 4 times): Checks for broken outdoor PCB, IPM module, or communication wiring. Involves checking terminals, connected wires, and voltage.
- Power Supply Over or Under Voltage Fault (F19, LED1 flashes 6 times): Checks for abnormal voltage. Involves checking power supply and IPM module.
- Overheat Protection For Discharge Temperature (F4, LED1 flashes 8 times): Checks for electronic expansion valve defects, faulty thermistor, or insufficient gas. Involves measuring exhaust temperature and checking for cryogen leaks.
- Communication Fault between Indoor and Outdoor (E7, LED1 flashes 15 times): Checks for communication wiring issues, or broken indoor/outdoor PCBs. Involves restarting, checking linking cables, and measuring voltages.
- Loss of Synchronism Detection (F11, F28, LED1 flashes 18 or 19 times): Checks for incorrect compressor wiring or damaged compressor.
- High Work-Intense Protection (E9, LED1 flashes 21 times): Checks for faulty electronic expansion valve, dirty heat exchanger, faulty heat-exchange sensor, or insufficient gas. Involves checking wind temperature, room/pipe temperature sensors, and cleaning filters.
Removal Procedures (for SERIES:25N)
The manual provides step-by-step instructions for disassembling the indoor unit, emphasizing the importance of waiting 10 minutes after turning off power before starting work.
- Removal of front panel: Involves removing foam cushion, lifting the front panel, and loosening screws.
- Removal of air filters: Involves lifting and pulling out the air filters.
- Removal of the casing: Involves loosening 6 screws and releasing three hooks, then pulling out the front grille.
- Removal of horizontal flap and the stepper motor: Involves releasing the center pivot, bending the horizontal blade, and loosening screws to remove the stepper motor.
- Removal of horizontal louver and control box: Involves moving each blade and loosening screws.
- Removal of Heat Exchanger: Involves loosening a hook, a screw, and then lifting out the exchanger.
- Removal of Fan Rotor and Fan Motor: Involves loosening screws and removing the motor cover, then lifting and sliding out the fan and motor.
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