Fujitsu AS G07KMTA Series

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Overview

Function Description
Important Technical Specifications
Usage Features
Maintenance Features

This document provides a comprehensive service instruction manual for Fujitsu General Limited's Split Type Room Air Conditioner, specifically for Wall Mounted Inverter models. The manual covers various aspects of the device, including its operational controls, troubleshooting procedures, and appending data.

Function Description

The air conditioner operates in several modes:

Cooling Operation: The compressor frequency is controlled based on the difference between the set temperature and the room temperature. It reaches maximum performance if the room temperature is 6°C higher than the set temperature and stops if the room temperature is some degrees lower. The maximum frequency is also limited by indoor fan mode and outdoor temperature.
Heating Operation: Similar to cooling, the compressor frequency is controlled by the room temperature thermistor. It reaches maximum performance if the room temperature is 6°C lower than the set temperature and stops if some degrees higher.
Dry Operation: The compressor frequency adjusts according to the temperature, set temperature, and room temperature variations detected by the indoor unit's room temperature sensor.
Auto Changeover Operation: In AUTO mode, the system automatically switches between Heating, Cooling, and Monitoring modes based on temperature changes. The temperature can be set between 18°C and 30°C in 0.5°C steps.
Indoor Fan Control: The airflow can be set in 5 steps (Auto, Quiet, Lo, Me, Hi). In Auto mode, it operates at "Me" fan speed. In Cooling mode, the fan motor runs based on room temperature, while in Heating mode, it runs at a constant airflow for specific settings.
Outdoor Fan Control: The outdoor fan motor speed varies with compressor frequency, outdoor heat exchanger, and outdoor temperature. After defrost control in heating mode, the fan speed maintains a higher setting.
Louver Control: Vertical louver direction can be adjusted through preset ranges (1 to 6) or automatically based on the operation mode. Horizontal louvers can be manually adjusted. A swing operation allows the vertical louver to move automatically.
Compressor Control: The operation frequency of the compressor varies based on the mode (Cooling/Dry or Heating) and is limited by outdoor temperature.
Timer Operation Control: Includes ON Timer, OFF Timer, Program Timer, and Sleep Timer functions. The Sleep Timer monitors room temperature and stops operation automatically, adjusting the set temperature over time in both cooling and heating modes.
Wired Remote Controller (Option): Offers ON Timer, OFF Timer, Weekly Timer, and Day Off settings for more flexible scheduling.
Electronic Expansion Valve Control: The valve's opening is calculated and controlled based on operating conditions, including compressor frequency, discharge temperature, indoor/outdoor heat exchanger temperatures, and outdoor temperature.
Test Operation Control: Allows for forced cooling or heating test runs for diagnostic purposes.
Prevent to Restart for 3 Minutes: Prevents the compressor from restarting for 2 minutes and 20 seconds after it stops.
Four-Way Valve Extension Select: Manages the switching of the four-way valve during mode changes (e.g., cooling to heating).
Auto Restart: Memorizes operation contents during a power interruption and automatically restarts with those settings upon power recovery.
Manual Auto Operation: Allows basic operation (auto changeover, auto fan, 24°C setting) if the remote control is unavailable.
Forced Cooling Operation: Initiates a forced cooling test run, overriding room temperature sensors, for 60 minutes or until manually stopped.
Compressor Preheating: Heats the compressor when the outdoor heat exchanger temperature is low (-4°C or less) and heating operation has been stopped for 30 minutes, ensuring warm air discharge upon restart.
10°C Heat Operation: Maintains a minimum room temperature of 10°C in heating mode, useful for preventing freezing.
Economy Operation: Reduces maximum output by approximately 30% in cooling/heating modes, adjusting target temperatures slightly.
Outdoor Unit Low Noise Operation: Reduces outdoor unit noise by stopping PFC control and adjusting current release values.
Powerful Operation: Operates the indoor and outdoor units at maximum power for rapid cooling or heating.
Defrost Operation Control: Automatically initiates defrosting when the outdoor heat exchanger temperature is low, based on compressor integrating operation time and temperature sensors.
OFF Defrost Operation Control: Performs defrosting automatically when heating operation stops and frost is detected on the outdoor unit heat exchanger.
Various Protections: Includes discharge gas temperature override prevention, current release control, anti-freezing control (cooling/dry mode), cooling pressure override protection, and high temperature release control (heating mode).

Important Technical Specifications

Compressor Frequency Range (Cooling/Dry):
- AO*G07KMTA, AO*G07KMCC: 14rps (Min), 60rps (Max II), 84rps (Max I)
- AO*G09KMTA, AO*G09KMCC: 14rps (Min), 64rps (Max II), 90rps (Max I)
- AO*G12KMTA, AO*G12KMCC: 14rps (Min), 78rps (Max II), 90rps (Max I)
- AO*G14KMTA, AO*G14KMCC: 12rps (Min), 77rps (Max II), 89rps (Max I)
Compressor Frequency Range (Heating):
- AO*G07/09/12KMTA, KMCC: 14rps (Min), 110rps (Max)
- AO*G14KMTA, KMCC: 12rps (Min), 110rps (Max)
Compressor Frequency in Dry Mode:
- AO*G07/09/12KMTA, KMCC: 24rps (X zone), 18rps (J zone), 0rps (Y zone)
- AO*G14KMTA, KMCC: 24rps (X zone), 16rps (J zone), 0rps (Y zone)
Electronic Expansion Valve Pulse Range: 0 to 480 pulses.
Refrigerant: R32.
Thermistor Resistance Values: Detailed tables are provided for room temperature, indoor heat exchanger, discharge, outdoor heat exchanger, and outdoor temperature thermistors across various temperatures. For example, a room temperature thermistor at 25°C has a resistance of 10.0 kΩ.
Outdoor Fan Motor Type: DC Motor.
Power Supply Voltage Check: AC207V to AC253V at Outdoor Unit Terminal L-N.
Wired Remote Controller Voltage: DC12V.

Usage Features

Remote Control Settings: Allows users to set operation modes, fan speeds, louver directions, and various timer functions.
Function Setting for Wireless RC: Procedures are detailed for changing function settings, including remote controller address, filter sign display intervals, room temperature control for indoor unit and wired remote controller sensors, auto restart, remote controller custom code, and external input control.
Self-Diagnosis: Wired remote controllers can display error codes ("Er") for system inspection. Up to 16 memorized error codes can be displayed.
Manual Override: A MANUAL AUTO button on the indoor unit allows for basic operation if the remote control is lost or its batteries are depleted.
Energy Saving: Economy operation and indoor unit fan control for energy saving in cooling mode are available.
Comfort Features: 10°C Heat operation for preventing freezing, Powerful operation for rapid conditioning, and Outdoor Unit Low Noise operation for quieter performance.

Maintenance Features

Error Display and Troubleshooting: The manual provides detailed error codes and flashing patterns for the indoor unit (OPERATION, TIMER, ECONOMY lamps) and wired remote controller display. Each error code is linked to a specific troubleshooting guide.
Troubleshooting Steps: For each error, a systematic approach is provided, including:
- Check Point 1: Reset power and observe if the error persists.
- Check Point 2: Inspect connections (loose, removed, erroneous wiring) and external causes (noise, grounding, voltage drop).
- Check Point 3: Verify power supply voltage and electrical components (fuses, varistors).
- Check Point 4: Examine serial signals, fan motors, and compressor components.
- Check Point 5: Replace specific PCBs or components if previous checks do not resolve the issue.
Specific Component Checks:
- Compressor: Diagnosis includes checking for open/loose connection cables, winding resistance (e.g., 2.180 Ω at 20°C for 07/09/12KMTA, KMCC models), gas pipe valve status, refrigerant leaks, and strainer clogging.
- Electronic Expansion Valve (EEV): Checks include connector connections, coil winding resistance (46 Ω ± 4 Ω at 20°C), voltage from Main PCB (DC12V), and noise during startup. It also describes checking the valve's opening and closing operation by observing temperature differences.
- Indoor/Outdoor Fan Motors: Checks involve rotating the fan by hand for obstructions, checking ambient temperature around the motor, and verifying output voltage from the Main PCB (e.g., Red-Black: 306-374V, White-Black: 15±1.5V for outdoor fan motor).
- Thermistor Checks: Detailed resistance values are provided for various thermistors at different temperatures to diagnose open or short circuits.
No Error Code Troubleshooting: Guides are provided for issues like "Indoor Unit - No Power" or "No Cooling / No Heating," covering installation conditions, external causes, and electrical components.
EEPROM Note: Highlights that EEPROM stores memorized information even without power, and rewriting has limitations.