Hitachi RAS-10JH3 - User Manual

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Overview

General Description
Functions and Features
Important Technical Specifications
Usage Features
Maintenance Features

This document is a service manual for the Hitachi RAS-10JH3 / RAC-10JH3 and RAS-14JH3 / RAC-14JH3 room air conditioner models, covering technical information, usage, and maintenance.

General Description

The Hitachi room air conditioner is a DC inverter (wall type) unit designed for both cooling and heating operations. It comprises an indoor unit (RAS-series) and an outdoor unit (RAC-series). The system uses R410A refrigerant.

Functions and Features

Indoor Unit:

Air Purification Unit (Internal): Traps cigarette smoke, pollen, etc.
Pre-Filter (Internal): Prevents dust from entering the indoor unit.
Horizontal/Vertical Deflector (Air Outlet): Controls the direction of airflow.
Drain Hose: Drains dehumidified water from the indoor unit to the outdoor unit during cooling or dehumidifying.
Two Way Air Exchange Fan (Internal): Operates during two-way air exchange.
Two Way Air Exchange Hose: Vents air from outside into the room (fresh air in) or from the room to outside (exhaust).
Indoor Unit Indicators: Lights indicate operating conditions.
Signal Receiver: Receives signals from the remote controller.

Outdoor Unit:

Air Inlets (Rear and Left Sides): Points of air intake.
Air Outlet: Point of air discharge.
Drain Port (Bottom): For condensate or defrost water drainage.
Earth Terminal: For grounding the unit.

Two Way Air Exchange Duct Filter:

Exhaust Pre-Filter: Traps dirt and dust particles during exhaust operation.
Nano-Titanium Disinfecting Deodorizing/Dust Collecting Fresh Air In Filter: Deodorizes and eliminates dust from air ventilated from outside.
Fresh Air In Pre-Filter: Traps dirt and dust particles from air ventilated from outside.
Dirt Sensor: Detects cigarette smoke, sprays (pesticides), alcohol, etc.

Indoor Unit Control Panel:

Temporary Switch: Allows starting/stopping operation if the remote controller is not working. The unit will operate in the most recent setting mode.
Power Switch: Turns the unit on/off.

Remote Controller:

Signal Emitting Window/Transmission Sign: Points towards the indoor unit to send signals.
Display: Shows selected room temperature, current time, timer status, function, and circulation intensity.
START/STOP Button: Starts and stops operation.
HEATING Button: Direct selection of heating mode.
AUTO Button: Direct selection of auto mode.
COOLING Button: Direct selection of cooling mode.
TEMPERATURE Buttons: Adjusts temperature settings.
FAN Button: Determines fan speed (AUTO, HI, MED, LOW, SILENT).
SLEEP Button: Sets the sleep timer.
TWO WAY AIR EXCHANGE Button: Starts two-way air exchange mode.

Important Technical Specifications

Models:

Indoor Unit: RAS-10JH3, RAS-14JH3
Outdoor Unit: RAC-10JH3, RAC-14JH3

Power Source: 1 Phase, 50Hz, 220-230V

Cooling (RAS-10JH3 / RAC-10JH3):

Total Input: 580 W (range: 155 - 1,160 W)
Total Amperes: 3.11 - 2.97 A
Capacity: 2.50 kW (range: 0.90 - 3.10 kW) / 8,530 BTU/h (range: 3,070 - 10,580 BTU/h)

Cooling (RAS-14JH3 / RAC-14JH3):

Total Input: 990 W (range: 155 - 1,380 W)
Total Amperes: 4.74 - 4.54 A
Capacity: 3.50 kW (range: 0.90 - 4.00 kW) / 11,940 BTU/h (range: 3,070 - 13,650 BTU/h)

Heating (RAS-10JH3 / RAC-10JH3):

Total Input: 795 W (range: 115 - 1,170 W)
Total Amperes: 4.02 - 3.85 A
Capacity: 3.40 kW (range: 0.90 - 4.40 kW) / 11,600 BTU/h (range: 3,070 - 15,010 BTU/h)

Heating (RAS-14JH3 / RAC-14JH3):

Total Input: 1,040 W (range: 115 - 1,350 W)
Total Amperes: 4.98 - 4.76 A
Capacity: 4.20 kW (range: 0.90 - 5.00 kW) / 14,330 BTU/h (range: 3,070 - 17,060 BTU/h)

Dimensions (mm):

Indoor Unit (W x H x D): 790 x 298 x 210
Outdoor Unit (W x H x D): 750 (+91) x 548 x 288 (+47) (Note: +91 and +47 are after installation)

Net Weight (kg):

Indoor Unit: 10
Outdoor Unit: 35

Refrigerant Charging Volume (R410A): 870g (for unit), without refrigerant for pipes (max. 20m) because coupling is flare type.

Fan Motor:

Indoor: 25W (DC35V)
Outdoor: 40W (DC350V)

Compressor: EU1011E7 (800W, DC 220-350V)

Fuse (for Microprocessor): 3.0A

Varistor: 450NR

Thermostat: YES(IC)

Usage Features

Auto Restart Control:

Automatically restarts operation with previous mode and airflow direction after a power failure.
Not available when Timer or Sleep Timer mode is set.

Automatic Operation:

Automatically determines heating or cooling mode based on initial room temperature.
Mode may change if room temperature varies.

Heating Operation:

Recommended for outdoor temperatures under 21°C.
Heating function may not work above 21°C to protect the device.
Operate above -15°C outdoor temperature for reliability.
Defrosting occurs about once an hour when frost forms on the outdoor unit, lasting 5-10 minutes.

Cooling Operation:

Recommended for outdoor temperatures between -10°C and 42°C.
High indoor humidity (over 80%) may cause dew on the indoor unit's air outlet grill.

Dehumidifying Operation:

Operates when room temperature is over 16°C.
Dehumidifying function will not work below 15°C.
Target temperature is slightly lower than the room temperature setting (16°C for a 16°C setting).

Air Purifier Operation (FAN):

Operated by pressing the AIR PURIFIER button.
Fan speed can be adjusted (HI, MED, LOW, SILENT).
Power of the air purifier increases with higher air conditioner fan speed.

Fan Operation:

Can be used as an air circulator to dry the indoor unit.
Fan speed can be set to AUTO, HI, MED, LOW, SILENT.
In AUTO mode, fan speed adjusts based on discharged air temperature.

Two Way Air Exchange Operation:

Operates fresh air in and exhaust functions.
Can be combined with air conditioning operation.
Not recommended for simultaneous fresh air in and exhaust operation.
Fresh Air In: Does not operate if outdoor temperature is extreme (above 30°C or below 3°C) or if temperature difference between indoor/outdoor is too large (above 7°C for cooling, above 22°C for heating) to prevent dew condensation or save energy.
Exhaust: Does not operate if room temperature is above 43°C to protect the fan.
Abnormal Fan: If the "Two Way Air Exchange" lamp blinks (4 seconds on, 1 second off), the fan is abnormal.

Sleep Timer:

Selectable for 1, 2, 3, or 7 hours.
"7 hrs. Monitoring" mode stops cooling/dehumidifying after 3 hours, then monitors room temperature for 4 hours, operating/stopping repeatedly.
For heating, "7 hrs. Monitoring" restarts if room temperature falls by 4-5°C.
Fan speed is set to SILENT during sleep operation.

Adjusting Air Deflectors:

Horizontal air deflector automatically sets to the proper angle or can be adjusted with the AUTO SWING button.
Vertical air deflectors are adjusted manually by hand.

Safety Precautions:

Disconnect power before disassembly or repair.
Use genuine parts for replacement.
Ensure proper grounding.
Do not place inflammable objects near the unit.
Avoid direct air flow for extended periods for health.
Do not reconstruct the unit or install it yourself.
Use specified piping set for R410A.
Install a circuit breaker.
Do not install near flammable gas.
Ensure smooth drain hose flow.
Use a single phase 230V power source.
During operation, regularly ventilate the room when using burning equipment.
Do not wash the unit with water or place water containers on it.
Do not climb on the outdoor unit.
Do not touch air outlet, bottom surface, or aluminum fin of the outdoor unit.
Do not touch refrigerant pipe and connecting valve (risk of burns).
Supervise young children to ensure they do not play with the appliance.

Maintenance Features

Regular Cleaning:

Deep cleaning of two-way air exchange duct filters (Fresh Air In Pre-Filter, Exhaust Pre-Filter, Nano-Titanium Disinfecting Deodorizing/Dust Collecting Fresh Air In Filter) is recommended regularly.
Check filters every 2 weeks if Fresh Air In operation is used often.
Fresh Air In Pre-Filter: Wash with water, allow to drip dry. Use lukewarm water (max 40°C) for stubborn dirt.
Nano-Titanium Disinfecting Deodorizing/Dust Collecting Fresh Air In Filter: Wash and dry in shade every 3 months. Replace every 3 years.
Exhaust Pre-Filter: Wash with water, allow to drip dry.
Front Panel and Top Grill: Remove and wash with clean water and a soft sponge. Wipe with a soft dry cloth.

Long Off Period Maintenance:

Run the unit in FAN mode (HI speed) for about half a day on a fine day to dry the unit.
Switch off power plug or circuit breaker.

Battery Exchange (Remote Controller):

Remove cover, replace old batteries, ensuring correct polarity.
Do not mix new and old batteries or different kinds.
Remove batteries if not using the remote controller for 2-3 months.

Address Changing Switch:

Used to avoid interference between remote controllers when two indoor units are in the same room.
Normally set to "A" from the factory.

Self Clean Operation:

Automatically performs self-clean after cooling and dehumidifying to suppress mold.
Recommended when utilizing fresh air in operation to dry the two-way air exchange fan and hose.
Operates for about one hour and then stops automatically.
Does not perform if cooling/dehumidifying operation is less than 1 hour.

Automatic Two Way Air Exchange Operation:

Detects dirty air and automatically operates exhaust and fresh air in.
Exhaust operates for at least 20 minutes after dirt detection, even if a window is opened.
If the room air is dirty, exhaust operation may not perform for 5 minutes.

Dirt Sensor Sensitivity:

Adjustable to 7 levels (+3 to -3).
Adjusted using the Room Temperature button while the unit is stopped.

Self-Diagnosis Memory Function:

Displays diagnosed failure modes stored in non-volatile memory via remote controller.
Effective for checking failure modes when power was turned off or operation restarted without checking lamp blinking frequency.
Stores the past 5 failure modes.
Failure modes with low occurrence frequency are also stored.
Memory can be cleared.

Troubleshooting (Timer Lamp Blinking):

1 blink: Reversing valve defective, heat exchanger thermistor disconnected (heating mode only).
2 blinks: Outdoor unit under forced operation.
3 blinks: Indoor/outdoor interface defective.
9 blinks: Room thermistor or heat exchanger thermistor faulty.
10 blinks: Over-current detection at DC fan motor.
13 blinks: IC401 data reading error.
16 blinks: Ventilation fan abnormal (motor does not rotate).
17 blinks: Dirt sensor abnormal (disconnection or short circuit).

Troubleshooting (Filter Lamp Blinking):

2 blinks: Peak current cut.
3 blinks: Abnormal low speed rotation.
4 blinks: Switching failure.
5 blinks: Overload lower limit cut.
6 blinks: OH thermistor temp. rise.
7 blinks: Outdoor thermistor abnormal.
8 blinks: Acceleration defective.
9 blinks: Communication error.
10 blinks: Abnormal power source.
12 blinks: Fan lock error.
13 blinks: Defective EEPROM of outdoor unit.

Discharge Procedure (Power Circuit):

Turn off the indoor unit or pull out the power supply plug.
Wait 10 minutes or more.
Remove electrical parts cover and apply a soldering iron (30-75W) to TAB3 (GRAY) and TAB4 (RED) terminals on the main P.W.B. for 15 seconds or more to discharge smoothing capacitor voltage.

IPM (Intelligent Power Module) Diagnosis:

Measure resistance using a multimeter (resistance x 100 range). High resistance is OK.
If low conductivity is suspected, reverse probe polarity and check again.
If 15V is not generated, internal IC may be malfunctioning.
LD301 blinks 2 times: Peak current cut.
LD301 blinks 3 times: Abnormal low speed.
LD301 blinks 4 times: Switching incomplete.
LD301 blinks 1 time: Reset stop.

Checking Refrigerating Cycle: