Hitachi RAS-30CH6 - User Manual

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NO. 0301E

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

ROOM AIR CONDITIONER

INDOOR UNIT + OUTDOOR UNIT

DECEMBER 2005

Refrigeration & Air-Conditioning Division

SERVICE MANUAL

REFER TO THE FOUNDATION MANUAL

TECHNICAL INFORMATION

FOR SERVICE PERSONNEL ONLY

(W)

(A)

(kW)

(B.T.U./h)

(W)

(A)

(kW)

(B.T.U./h)

(kg)

(WALL TYPE)

TYPE

MODEL

POWER SOURCE

TOTAL INPUT

TOTAL AMPERES

CAPACITY

TOTAL INPUT

TOTAL AMPERES

CAPACITY

DIMENSIONS

(mm)

NET WEIGHT

SPECIFICATIONS

RAS-30CH6

CONTENTS

SPECIFICATIONS ----------------------------------------------------- 4

HOW TO USE ---------------------------------------------------------- 6

CONSTRUCTION AND DIMENSIONAL DIAGRAM ------- 30

MAIN PARTS COMPONENT ------------------------------------- 32

WIRING DIAGRAM -------------------------------------------------- 34

CIRCUIT DIAGRAM ------------------------------------------------- 35

PRINTED WIRING BOARD LOCATION DIAGRAM ------- 37

BLOCK DIAGRAM --------------------------------------------------- 39

BASIC MODE --------------------------------------------------------- 41

REFRIGERATING CYCLE DIAGRAM ------------------------- 47

DESCRIPTION OF MAIN CIRCUIT OPERATION --------- 48

AUTO SWING FUNCTION ---------------------------------------- 55

SERVICE CALL Q & A -------------------------------------------- 56

TROUBLE SHOOTING --------------------------------------------- 62

PARTS LIST AND DIAGRAM ------------------------------------ 65

RAS-30CH6/RAC-30CH6

COOLING

HEATING

OUTDOOR UNIT

RAC-30CH6

INDOOR UNIT

RAS-30CH6

1150

333

245

925

875

315

1 Ø, 50 Hz, 220 ~ 240V

2900 – 2900

13.3 – 12.2

8.1 – 8.1

27,640 – 27,640

2900 – 2900

13.3 – 12.2

8.8 – 8.8

30,030 – 30,030

After installation

RAC-30CH6

0301E (30CH6) cover 16/12/05, 2:33 PM1

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The provided document is a service manual for a Hitachi Room Air Conditioner, specifically models RAS-30CH6 (Indoor Unit) and RAC-30CH6 (Outdoor Unit).

Function Description

This service manual details the technical information for the Hitachi Room Air Conditioner, covering its operation, maintenance, and troubleshooting. The unit is designed to provide cooling, heating, dehumidification, and fan-only operation for indoor spaces. It features a remote controller for user interaction and various automatic functions to optimize comfort and energy efficiency.

Important Technical Specifications

Model: RAS-30CH6 (Indoor Unit) / RAC-30CH6 (Outdoor Unit) Power Source: 1 Ø, 50 Hz, 220 ~ 240V Cooling:

Total Input: 2900 W
Total Amperes: 13.3 - 12.2 A
Capacity: 8.1 kW (27,640 BTU/h) Heating:
Total Input: 2900 W
Total Amperes: 13.3 - 12.2 A
Capacity: 8.8 kW (30,030 BTU/h) Dimensions (Indoor Unit):
Width (W): 1150 mm
Height (H): 333 mm
Depth (D): 245 mm Net Weight (Indoor Unit): 15 kg Dimensions (Outdoor Unit):
Width (W): 925 mm
Height (H): 875 mm
Depth (D): 315 mm Net Weight (Outdoor Unit): 75 kg Refrigerant: R22 (2400g charge, additional 40g per meter if pipe length exceeds 8m) Piping Length: Max. 30m Height Difference (Indoor/Outdoor Unit): Max. 10m Fan Motor (Indoor Unit): 30 W Fan Motor (Outdoor Unit): 80 W Compressor Model: 2JD514E Compressor Locked Rotor Current: 65.2 A Capacitors:
Fan Motor Capacitor (Outdoor): 6.0 µF, 400V
Compressor Motor Capacitor (Outdoor): 60 µF, 450V Fuses:
Micro Computer Circuit: 3.15A
Terminal Board (Outdoor): 102°C thermal fuse Thermostat: IC (Integrated Circuit) type, with specific ON/OFF temperatures for cooling and heating. Operating Temperature Range:
Cooling: Outdoor dry bulb 21-43°C, wet bulb 15-26°C. Indoor dry bulb 21-32°C, wet bulb 15-23°C.
Heating: Outdoor dry bulb 1-27°C, wet bulb 1-19°C. Indoor dry bulb 20-35.6°C, wet bulb 12-27.6°C. System Impedance: Maximum 0.18+j0.11 Ohm at the house main power supply connection point.

Usage Features

The air conditioner offers several operational modes and features for user convenience:

Remote Controller: Controls operation, fan speed, temperature setting, sleep timer, and horizontal/vertical air deflectors. It has a display for selected room temperature, current time, timer status, function, and circulation intensity.
Operating Modes: AUTO, HEAT, DEHUMIDIFY, COOL, FAN.
Fan Speed Selection: AUTO, HI, MED, LOW.
Auto Swing Function: Controls horizontal and vertical air deflectors for even air distribution. The horizontal deflector swings up and down, while vertical deflectors can swing left/right in parallel or symmetry.
Timer Functions: OFF-TIMER, ON-TIMER, RESERVE, CANCEL. Allows scheduling of operation start and stop times.
Sleep Timer: Automatically adjusts fan speed and room temperature for quiet and healthy sleep. Can be set to turn off after 1, 2, 3, or 7 hours.
Temporary Switch: Allows basic operation (previous mode and temperature) if the remote controller is lost or faulty. Starts automatic operation if the power switch was OFF.
UV-LED: Emits ultraviolet light during selected operations (except FAN only) for air purification. Visible glare is normal.

Maintenance Features

The manual provides instructions for both user and service personnel maintenance:

Air Filter Cleaning: Recommended every 2 weeks to maintain air volume and cooling efficiency. Involves opening the front panel, removing the filter, washing it with water, and drying it.
Washable Front Panel: Can be removed and washed with clean water and neutral detergent.
Long Off Period Maintenance: Before extended non-use, run the unit in COOL mode at 32°C with HI fan speed for half a day to dry the unit, then switch off the power plug.
Regular Inspection (by Qualified Service Personnel):
- Check earth line connection.
- Inspect mounting frame for rust or instability.
- Verify secure power line plug connection.
Troubleshooting Guide: Provides a systematic approach to diagnose common issues based on timer-lamp blinking patterns (e.g., 4-way valve not working, DC fan motor overflow, heat exchanger thermistor error, room thermistor error).
Safety Precautions: Emphasizes disconnecting power before repairs, using genuine parts, proper wiring, avoiding user modifications, calibrating tools, preventing accidents during installation, checking insulation resistance (1MΩ or more with 500V DC megger), ensuring stable installation, avoiding flammable materials, and proper grounding.
Semiconductor Handling: Guidelines for preventing breakage, including using conductive containers, body earthing (1MΩ resistance), grounding working tables and soldering irons, and using high insulation mode for soldering irons.
Compressor Oil Check: If the unit has operated for a long time with clogged capillary tubes or low coolant, check the color of the refrigerant oil. If conspicuously changed, replace the compressor.