Hitachi RAS-D10EX3 - User Manual

This document describes a Hitachi split-type air conditioner, including its indoor and outdoor units, remote controller, and various operational and maintenance features.

Indoor Unit

The indoor unit features an air cleansing filter and an air filter to prevent dust from entering. It has a movable front panel that automatically opens during operation and closes when stopped. Horizontal and vertical deflectors control the air outlet direction. Indicators on the unit show the operating condition, and a signal receiving port allows communication with the remote controller.

Outdoor Unit

The outdoor unit has an air outlet, a drain hose for dehumidified water, and piping and wiring connections. Air inlets are located on the rear and left sides. During "Stop" operation, the outdoor fan continues to turn for 10 to 60 seconds to cool electrical parts. In heating mode, condensate or defrost water may flow from the drain port.

Remote Controller

The remote controller operates the indoor unit from up to 7 meters away. It features a signal emitting window, a display showing room temperature, time, timer status, function, and circulation intensity. Buttons include:

START/STOP: To begin or end operation.
AIR PURIFIER: Activates the air purifying function, generating negatively-charged ions to capture dust.
FAN SPEED selector: Adjusts fan speed from AUTO, HI, MED, LOW, to SILENT.
SLEEP: Sets the sleep timer.
TEMPERATURE buttons: Raises or lowers the temperature setting.
TIME: Sets and checks the time and date.
RESET: Used after battery replacement or irregular operation.
FUNCTION selector: Cycles through AUTO, HEAT, DEHUMIDIFY, COOL, and FAN modes.
AUTO SWING: Controls horizontal air deflector swing.
EXTENDED AIRFLOW: Pushes air further for extended airflow.
TIMER control (OFF-TIMER, ON-TIMER, RESERVE, CANCEL): Manages scheduled operations.

Precautions for Remote Controller Use: Avoid direct sunlight or proximity to heaters. Handle with care to prevent damage from drops or water. After battery replacement, the unit may take about 10 seconds to respond. The outdoor unit has a 3-minute restart delay for protection. Pressing the FUNCTION selector during operation may cause a 3-minute stop for protection.

Various Functions

Auto Restart Control: In case of power failure, the unit automatically restarts with previous settings once power is restored. This feature is not available if a Timer or Sleep Timer mode is set.

Automatic Operation: The unit automatically selects HEAT or COOL based on initial room temperature and adjusts as needed. The monitoring range is ±3°C relative to the preset temperature. If the automatically selected mode is unsatisfactory, it can be manually changed.

Heating Operation: Use when outdoor temperature is below 21°C (not above 21°C to protect the device) and above -15°C for reliability. The fan speed can be set to AUTO, HI, MED, LOW, or SILENT. Defrosting occurs about once an hour for 5-10 minutes when frost forms on the outdoor unit's heat exchanger, with the operation lamp blinking.

Dehumidifying Operation: Effective when room temperature is over 16°C. The fan speed is set to LOW or SILENT. The recommended temperature range for dehumidifying is 20-26°C. If the room temperature is higher than the setting, the unit dehumidifies to the preset level. If lower, it dehumidifies at a slightly lower temperature than current, stopping when the room temperature falls below the setting.

Cooling Operation: Use when outdoor temperature is between -10°C and 42°C. High indoor humidity (over 80%) may cause dew on the air outlet grille. The fan speed can be set to AUTO, HI, MED, LOW, or SILENT. Cooling starts only if the temperature setting is below the current room temperature.

Fan Operation: Functions as an air circulator. Useful for drying the indoor unit at the end of summer. Fan speed automatically adjusts in AUTO mode during cooling/heating.

Extended Airflow: Adjusts airflow direction and speed to reach further distances. If AUTO SWING is active, EXTENDED AIRFLOW cancels it, and vice versa. During stop operation, this button activates a dry function to prevent mold and odor in the heat exchanger.

Adjusting Air Deflectors:

Upward/Downward: The horizontal deflector automatically adjusts. Pressing the AUTO SWING button makes it swing continuously; pressing again stops it. Avoid continuous swinging in cooling mode to prevent dew formation.
Left/Right: Manually adjust the vertical air deflector by holding it and moving it to the desired position.

Sleep Timer: Sets the unit to turn off after a designated number of hours. The remote controller displays the turn-off time.

ON/OFF Timer: Allows scheduling the unit to turn on and/or off at specific times. The current time must be set for this function.

Maintenance Features

Exchanging Remote Controller Batteries: Remove the cover, take out old batteries, and insert new ones, ensuring correct polarity. Do not mix old and new batteries or different types. Remove batteries if not using the remote controller for 2-3 months.

Temporary Switch: If the remote controller fails, this switch allows starting/stopping operation with the most recently set mode (or automatic mode if power was cycled).

Circuit Breaker: Turn off the circuit breaker when not using the air conditioner for extended periods.

Cleaning and Maintenance: Must be performed by qualified service personnel. Always stop operation and switch off power before cleaning.

Attaching Air Cleansing Filters:

Open the front panel by pulling it up at both sides.
Remove the filter by pushing up claws and pulling it out.
Attach air cleansing filters to the filter frame by gently compressing sides and releasing after insertion. Do not bend the filter.
Attach the filters with "FRONT" facing front, then push the front panel at three arrow points to close. Note: Air cleansing filters may slightly reduce cooling capacity and speed; use "HIGH" fan speed if needed. Do not operate without filters.

Cleaning the Air Filter:

Open the front panel and remove the filter, gently lifting the air cleansing filter from the frame.
Vacuum dust from both filters. For heavy dust, rinse the air filter under running tap water and gently brush. Air dry in shade.
Re-insert the air cleansing filter, then the air filter with "FRONT" facing front, and close the front panel. Caution: Do not wash with hot water (above 40°C) or expose to direct sun. Do not use detergent on the air cleansing filter.

Servicing Electrical Dust Collector's Electrical Terminals:

Stop operations and remove power.
Remove the front panel.
Use a dry toothbrush to remove dirt from the electrical terminals.
Re-install the front panel and restore power. Caution: Do not touch terminals during operation. Prevent water contact.

Washable Front Panel:

Remove the front panel by holding both sides, pushing the right arm inward, and pulling it forward while slightly closing the panel. Wash with clean water and a soft sponge, using neutral detergent if needed.
Wipe the front panel and remote controller with a soft dry cloth. Ensure no water remains on indicators or signal receiver.
To reattach, align projections of the arms with flanges in the unit and insert into holes. Caution: Do not splash water on the unit. Do not use hot water, benzine, gasoline, acid, thinner, or a brush.

Regular Inspection

Qualified service personnel should check the following points every six months or annually:

Earth line connection.
Stability and rust of the outdoor unit mounting frame.
Firmness of the power plug in the socket.

After Sale Service and Warranty

Troubleshooting:

Remote controller not transmitting: Check batteries and polarity.
Unit not operating: Check fuse, voltage, circuit breaker, and operation mode setting.
Poor cooling/heating: Check air filter, outdoor unit sunlight exposure/obstruction, open doors/windows, heat sources, temperature setting, and air inlet/outlet blockages. Check if fan speed is "LOW" or "SILENT."

Notes:

Slight refrigerant flowing noise or rubbing noise from the fan casing are normal.
Odors may be emitted due to accumulated smoke, foodstuffs, or cosmetics; clean filters and evaporator regularly.
Contact your sales agent for service, providing model, production number, installation date, and fault description.
Ensure power supply is at rated voltage.
Supply cord damage requires replacement by authorized service centers.
Slight brightness fluctuation in room light on startup is normal.
Ensure front panels are properly installed if movable panels are not moving.

Hitachi RAS-D10EX3 Specifications

General

Cooling Capacity	2.8 kW
Heating Capacity	3.2 kW
Power Supply	220-240V, 50Hz
Refrigerant	R410A
Weight (Outdoor Unit)	28 kg
Coefficient of Performance (COP)	3.61
Type	Split System
Noise Level (Outdoor)	50 dB(A)