This document describes the Trane AQUASTYLUS Chilled Water Fan Coil, a convertible type unit from the CFEA Series, designed for both 50 Hz and 60 Hz electrical systems. It functions as an air conditioning system, offering cooling-only or cooling/heating capabilities, and is suitable for various installations including floor, low wall, and under-ceiling configurations. The CFEA14, CFEA16, and CFEA20 models are specifically designed for under-ceiling and low wall installations.
Function Description
The AQUASTYLUS fan coil system is designed to provide comfortable and convenient cooling or heating/cooling for indoor spaces. It operates by circulating chilled or heated water through a coil, which then conditions the air that is distributed into the room by a fan. The system is equipped with a microprocessor that oversees its operation, ensuring efficient performance.
Key operational modes include:
- FAN Only: The fan operates to circulate air without cooling or heating.
- COOLING: The system provides cooling to reduce room temperature.
- DRY: This mode focuses on dehumidification while providing some cooling.
- HEATING (for Cooling/Heating Models): The system provides heating to raise room temperature.
- AUTO (for Cooling/Heating Models): The system automatically switches between cooling and heating modes to maintain a desired temperature setting.
The unit incorporates several system features to enhance reliability and user experience:
- Watchdog: A circuit monitors the microprocessor's operation.
- Non-Volatile Memory (Auto Restart): In the event of a power interruption, the system resumes operation with the last saved settings, excluding time-related parameters.
- Pre-heat/Post-heat (Heat Model): This feature prevents cold drafts by ensuring the indoor coil temperature is adequate before the fan starts in heating mode.
- Freeze Function (Optional): The system can stop the compressor if the indoor coil temperature drops below 0°C, protecting the unit from freezing.
- Freeze Protection: The system is protected against low indoor coil temperatures. If activated, the "COOL/DRY" LED will blink, indicating the protective function is active.
Usage Features
The AQUASTYLUS fan coil system offers flexible control options:
- Infrared Remote Control: A handheld remote allows users to control various functions from a distance. The remote features buttons for:
- POWER: To turn the unit on or off.
- MODE: To select operating modes (FAN, COOL, DRY, HEAT, AUTO).
- SWEEP: To activate a motor that distributes airflow by sweeping the supply air grille (not available in all models, or in models with cooling capacity more than 24,000 Btu).
- LOUVER: To adjust the direction of airflow.
- TEMP ▲/▼: To increase or decrease the set temperature.
- FAN: To select fan speed (LOW, MED, HIGH, AUTO).
- SLEEP: To activate a mode that automatically adjusts temperature settings during sleep for comfort and energy saving. In cooling mode, the set temperature is raised by 1°C after one hour. In heating mode, the set temperature is reduced by 1°C after one hour.
- CLOCK: To set the current time.
- START/STOP: To program ON/OFF timers for automatic operation.
- HOUR/MIN: To adjust time settings.
- SEND: To confirm programming on the remote unit.
The remote control also features an LCD display that shows the current time, timer settings, transmission indicator, SLEEP mode status, temperature setting, fan speed, and system mode.
- One-Touch Control Switch (on the unit): A physical button on the unit allows basic operation without the remote control. Pressing this button cycles through system modes (FAN → COOL → DRY → HEAT → AUTO → OFF) and sets the fan speed to AUTO, maintaining a 24°C setpoint. This mode is cancelled by any signal from the remote control.
- Wired Control: A wall-mounted wired control panel provides similar functionality to the remote control, including:
- Fan Button: To select fan speed (high, medium, low, or AUTO).
- Power On/Off Button: To turn the unit on or off, resuming the last program setting.
- Temperature Setting: A knob or buttons to set the temperature between 15°C and 30°C.
- Sleep Button: To activate the sleep function.
- Operating Mode Button: To select modes (COOL, FAN for cooling-only models; COOL, HEAT, FAN for cooling/heating models).
- Timer Button: To set ON/OFF timers up to 15 hours in advance.
- Toggle °C/°F: To switch the temperature display between Celsius and Fahrenheit.
The unit's display panel features four lamps indicating operating status: FAN (fan operating), COOLING (COOL or DRY mode), HEATING (HEAT or heater ON in AUTO mode), and TIMER (system controlled by timer). A 7-segment LED display shows room temperature, setting temperature (when blinking), and error codes like "RE" (room sensor open/short), "FE" (freeze sensor open/short), "HF" (heating system fail), and "Fr" (evaporator coil freeze).
Airflow direction can be adjusted manually via the supply air grille (left, right, up, or down). For models with the sweep option, the sweep motor automatically moves the supply air grille up and down to distribute air.
Maintenance Features
Regular maintenance is crucial for optimal performance and longevity of the AQUASTYLUS fan coil system. Users are advised to disconnect power before any inspection or maintenance.
Key maintenance tasks include:
- Cleaning the Air Filter:
- The air filter should be cleaned every two weeks during the cooling season to prevent reduced airflow and impaired cooling efficiency.
- To remove filters, push down and pull forward on each return air grille, then remove each air filter frame.
- Clean the air filter by washing it with clean water or using an electric vacuum cleaner.
- Ensure the filter is completely dry before returning it to its original position.
- Cautions: Do not wash the filter in water over 40°C, expose it to fire or direct sunlight for extended periods. Clean more frequently if the air is very dirty.
- Cleaning the Front Panel:
- Wipe the front panel lightly with a soft cloth. For heavy dirt, use a soft cloth soaked in water or neutral detergent.
- Cautions: Do not use water over 50°C, benzine, gasoline, thinner, polishing compound, or machine oil, as these can cause discoloration, paint peeling, deformation, or damage.
- Maintenance Before Prolonged Idle Period:
- Operate the fan for about half a day to dry the inside of the unit.
- Stop the air conditioner and disconnect power by turning off the safety breaker.
- Clean the air filter and return it to its original position.
Troubleshooting
The manual provides a troubleshooting guide for common issues:
- Air conditioner does not operate at all:
- Check if the ON/OFF switch is ON.
- Check for blown fuses or tripped circuit breakers.
- Verify power supply.
- Cooling is insufficient:
- Clean clogged air filters.
- Adjust thermostat setting to a lower temperature.
- Close open windows or doors.
- Remove heat sources from the room.
- Ensure return air grille or supply air grille are not blocked.
- Increase fan speed from LOW to MED or HIGH.
- Heating is insufficient:
- Clean clogged air filters.
- Adjust thermostat setting to a higher temperature.
- Close open windows or doors.
- Ensure return air grille or supply air grille are not blocked.
- Increase fan speed from LOW to MED or HIGH.
Safety Precautions
- Do not inspect or service the unit while it is operating; turn off power first.
- Keep the power cord away from sharp corners to prevent fire or electric shock.
- Turn off the power supply if the unit will not be used for a long time.
- Do not insert objects into the supply air outlet, especially for children.
- Do not pour water directly on the air conditioner.
- Adjust airflow to avoid blowing directly on occupants.
- Do not use flammable sprays near the unit.
- Do not use steel or copper wire in place of fuses.
- Stop the air conditioner immediately if the power cord is hot, insulation is exposed, fuses blow/circuit breaker trips frequently, or switches are inaccurate.
The Trane Company emphasizes that installations and servicing should be performed by qualified personnel, and the warranty may be voided if the equipment is modified or repaired without written approval, operating limits are exceeded, or if the control system or electrical wiring is modified. Damage due to misuse, lack of maintenance, or non-compliance with manufacturer's instructions is not covered by the warranty.
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