This document is a service manual for the Haier 1U50S2SJ2FA-1 outdoor air conditioner unit, providing comprehensive information for experienced repair technicians.
Function Description
The Haier 1U50S2SJ2FA-1 is an outdoor unit for a domestic air conditioning system, designed for both cooling and heating operations. It utilizes R32 refrigerant and is part of the Supermatch second-generation normal efficiency series. The unit's core function is to facilitate heat exchange with the outdoor environment, working in conjunction with an indoor unit to regulate indoor temperature. The system incorporates an Electronic Expansion Valve (EEV) for precise refrigerant flow control, optimizing performance in both cooling and heating modes. The compressor's operation frequency is dynamically controlled based on ambient and set temperatures, as well as various protection mechanisms. The outdoor fan also operates under controlled conditions to ensure efficient heat dissipation or absorption.
Important Technical Specifications
- Model Name Explanation: The model number 1U50S2SJ2FA-1 breaks down as follows: "1U" for outdoor unit (normal type), "50" for nominal cooling capacity (18000 BTU/h), "S2" for Supermatch second generation normal efficiency, "SJ" for outdoor casing, "2F" for version 2, "A" for R32 refrigerant, and "-1" for 220-240V50HZ/1ph series.
- Nominal Capacity:
- Cooling: 5.2 kW (17740 BTU/h)
- Heating: 6.0 kW (20470 BTU/h)
- Power Consumption (Rated):
- Cooling: 1.4 kW
- Heating: 1.5 kW
- SEER/SCOP:
- SEER: 6.2 W/W
- SCOP: 6.7 W/W
- Annual Energy Consumption:
- Cooling: 253 KWh
- Heating: 1401 KWh
- Moisture Removal: 2.0 x 10^-3 m³/h
- Dimensions (HWD):
- Unit: 820 x 338 x 614 mm
- Packaged: 963 x 413 x 685 mm
- Weight:
- Unit: 37.8 kg
- Gross: 41.5 kg
- Sound Level (Sound Pressure/Sound Power): 57 dB(A) / 63 dB(A) for both cooling and heating.
- Electrical Specifications:
- Nominal Running Current: 7.0 A (cooling), 5.0 A (heating)
- Maximum Running Current: 9.8 A (cooling), 10.2 A (heating)
- Starting Current: 1.0 A (both)
- Compressor: Rotary type, Model SVB140FCAMC, Motor output 975 W, Oil type FW68S, Oil charge volume 0.35 L.
- Fan: Axial fan type, Motor output 50 W, Air flow rate (high) 2500 m³/h, Speed (high/low) 800/300 rpm.
- Heat Exchanger: ML fin- & 7HI-HX tube, Rowstagefitch 2131.35.
- Refrigerant: R32, Charge 0.95 kg.
- Piping Connections (External Diameter): Liquid Φ6.35 mm, Gas Φ12.7 mm, Drain Φ16 mm.
- Max. Piping Length: 25 m.
- Max. Vertical Difference: 15 m.
- Chargeless Piping Length: 7 m.
- Amount of Additional Charge of Refrigerant: 20 g/m.
- International Protection Degree: IP X4.
- Sensors: Ambient sensor (outdoor temperature), Defrosting sensor (outdoor defrosting control), Discharging sensor (compressor overheat protection), Suction sensor (suction pipe temperature for gas flow adjustment).
Usage Features
The unit operates within specified temperature ranges for both cooling and heating modes.
- Cooling Operation Range: Outdoor temperature (DB) from -20°C to 43°C, Indoor temperature (WB) from 10°C to 35°C.
- Heating Operation Range: Outdoor temperature (WB) from -25°C to 24°C, Indoor temperature (DB) from 10°C to 27°C.
- Compressor Control: The compressor's frequency is controlled based on ambient and set temperatures, with minimum and maximum frequency limitations to ensure efficient and safe operation. It includes a soft start mechanism and dynamic frequency adjustment speeds (1Hz/second rapidly, 1Hz/10seconds slowly).
- Electronic Expansion Valve (EEV) Control: The EEV opening range is 90-480 steps for cooling and 60-480 steps for heating, with specific opening steps when the unit is off to prevent issues.
- Four-Way Valve Control: Manages the refrigerant flow direction for heating and defrosting, ensuring proper operation and compressor protection.
- Protection Functions:
- TTC High Temperature-Preventing Protection: Monitors air-blowing temperature to prevent overheating, with frequency reduction and eventual shutdown if critical temperatures are reached.
- TC High Temperature-Preventing Control: Monitors indoor heat exchanger temperature to prevent overheating, adjusting compressor speed.
- Over-current Protection: Detects excessive current in the compressor, leading to shutdown to prevent damage.
- Power Supply Over/Under Voltage Fault: Detects abnormal voltage levels and triggers protection.
- Overheat Protection for Discharge Temperature: Monitors compressor discharge temperature to prevent overheating, often indicating refrigerant leaks or piping issues.
- Loss of Synchronism Detection: Detects issues with compressor rotor position, indicating wiring or compressor damage.
- High Work-Intense Protection: Activated in heating mode if the heat exchanger thermistor detects temperatures above 65°C, potentially due to faulty EEV, dirty heat exchanger, or insufficient gas.
Maintenance Features
The manual provides detailed service diagnosis procedures for various malfunctions, categorized by indoor and outdoor display error codes.
- Safety Cautions: Emphasizes disconnecting power, avoiding contact with refrigerant gas, proper ventilation during welding, and discharging capacitors before repair. It also warns against using inappropriate parts or tools, improper installation, and damaging power cables.
- Problem Symptoms and Measures: A table outlines common symptoms (e.g., unit not operating, operation stops, no cooling/heating, noise/vibrations) and corresponding check items (power supply, PCBs, EEV, gas, installation condition) with detailed measures.
- Error Codes and Description: A comprehensive list of error codes (E1, E2, E4, E5, E7, E9, E14, F1, F2, F3, F4, F6, F7, F8, F9, F11, F12, F13, F14, F19, F20, F21, F22, F23, F24, F25, F27, F28, F35, F43, FE) with their corresponding outdoor LED flash times, fault descriptions, and likely spare parts.
- Troubleshooting Flowcharts: Step-by-step diagnostic flowcharts are provided for specific issues such as thermistor abnormality, EEPROM abnormal, indoor/outdoor DC fan motor malfunction, IPM protection, over-current of the compressor, communication faults, power supply over/under voltage, overheat protection for discharge temperature, loss of synchronism detection, and high work-intense protection. These flowcharts guide technicians through checks like voltage measurements, resistance checks, and terminal connections to identify the root cause of the problem.
- Thermistor Data: Tables provide resistance values for ambient, defrosting, and discharge sensors at various temperatures, crucial for diagnosing sensor malfunctions.
- Removal Procedures: Detailed instructions with illustrations are included for removing various components, such as the front panel, side panels, electrical box, fan, compressor, heat exchanger, heating pipe, and valves, facilitating repair and replacement.
- Circuit Diagrams: Includes detailed circuit diagrams for both the outdoor unit control board and the module board, essential for in-depth electrical troubleshooting.
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