Hitachi RAS-50YH4 User Manual

SM0226
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
ROOM AIR CONDITIONER
INDOOR UNIT + OUTDOOR UNIT
JANUARY 2005 Refrigeration & Air-Conditioning Division
SERVICE MANUAL
REFER TO THE FOUNDATION MANUAL
TECHNICAL INFORMATION
FOR SERVICE PERSONNEL ONLY
CONTENTS
SPECIFICATIONS ------------------------------------------------------------------- 5
HOW TO USE ------------------------------------------------------------------------ 7
CONSTRUCTION AND DIMENSIONAL DIAGRAM ---------------------- 30
MAIN PARTS COMPONENT --------------------------------------------------- 32
WIRING DIAGRAM ----------------------------------------------------------------- 35
CIRCUIT DIAGRAM ---------------------------------------------------------------- 39
PRINTED WIRING BOARD LOCATION DIAGRAM ---------------------- 42
BLOCK DIAGRAM ------------------------------------------------------------------ 46
BASIC MODE ------------------------------------------------------------------------ 48
REFRIGERATING CYCLE DIAGRAM ---------------------------------------- 60
AUTO SWING FUNCTION ------------------------------------------------------ 61
DESCRIPTION OF MAIN CIRCUIT OPERATION ------------------------ 62
SERVICE CALL Q & A ----------------------------------------------------------- 93
TROUBLE SHOOTING ------------------------------------------------------------ 96
PARTS LIST AND DIAGRAM ------------------------------------------------- 118
RAS-50YH4/RAC-50YH4
RAC-50YH4
RAS-50YH4
(W)
(A)
(kW)
(B.T.U./h)
(W)
(A)
(kW)
(B.T.U./h)
W
H
D
(kg)
RAS-50YH4 RAC-50YH4
DC INVERTER (WALL TYPE)
TYPE
MODEL
POWER SOURCE
TOTAL INPUT
TOTAL AMPERES
CAPACITY
TOTAL INPUT
TOTAL AMPERES
CAPACITY
DIMENSIONS
(mm)
NET WEIGHT
SPECIFICATIONS
780
280
205
9.5
COOLING
HEATING
INDOOR UNIT OUTDOOR UNIT
1 PHASE, 50 Hz, 230V
1,780 (155 ~ 2,200)
7.80
5.00 (0.90 ~ 5.20)
17,060
1,970 (115 ~ 2,200)
8.65
6.50 (0.90 ~ 8.10)
22,180
850
650
298
50

Hitachi RAS-50YH4 Specifications

General

Brand	Hitachi
Model	RAS-50YH4
Category	Air Conditioner
Language	English

Summary

Specifications

Safety During Repair Work

Working Standards for Preventing Breakage of Semiconductors

Safety Precaution

Precautions During Installation

Safety guidelines to follow before unit installation.

Precautions During Shifting or Maintenance

Safety measures for handling and maintaining the unit.

Precautions During Operation

Safety instructions for operating the air conditioner.

Names and Functions of Each Part

Indoor Unit

Identification and description of the indoor unit components.

Outdoor Unit

Identification and description of the outdoor unit components.

Model Name and Dimensions

Details on the model names and physical dimensions.

Names and Functions of Remote Control Unit

Remote Controller

Explanation of the remote controller's features and buttons.

Precautions for Use

Important considerations for using the remote control unit.

Various Functions

Auto Restart Control

Functionality of automatic restart after power interruption.

Automatic Operation

Description of the automatic mode operation.

Heating Operation

Dehumidifying Operation

Dehumidifying Function

Details on how the dehumidifying function operates.

Cooling Operation

Fan Operation

How to Set the Timer

Time, Day, Month

Procedure for setting the current time, day, and month.

OFF-Timer

Instructions for setting the timer to turn the unit off.

ON-Timer

Instructions for setting the timer to turn the unit on.

ON/OFF-Timer

Procedure for setting both ON and OFF timers.

How to Set the Sleep Timer

Explanation of the Sleep Timer

Adjusting the Air Deflector

How to Exchange the Batteries in the Remote Controller

The Ideal Ways of Operation

For User’s Information

The Air Conditioner And The Heat Source In The Room

Information regarding the unit and room heat sources.

Not Operating For A Long Time

Guidance on what to do when the unit is not used for extended periods.

When Lightning Occurs

Safety precautions during lightning storms.

Interference From Electrical Products

Advice on avoiding interference from other electrical devices.

Attaching the Air Cleansing and Deodorizing Filters

Maintenance

1. Air Filter

Procedure for cleaning and maintaining the air filter.

2. Washable Front Panel

Instructions for cleaning the washable front panel.

Maintenance at Beginning of Long Off Period

Regular Inspection

After Sale Service and Warranty

When Asking for Service, Check the Following Points

Points to verify before requesting service.

Construction and Dimensional Diagram

Indoor Unit

Detailed diagrams of the indoor unit's construction and dimensions.

Construction and Dimensional Diagram for Outdoor

Main Parts Component

Thermostat

Specifications and connection details for the thermostat.

Fan Motor

Specifications and connection diagram for the fan motor.

Compressor Motor

Wiring Diagram

Circuit Diagram

Remote Control

Schematic diagram for the remote control circuit.

Printed Wiring Board Location Diagram

Block Diagram

Basic Mode

Basic Cooling Operation

New Cool Rhythm

Cooling Sleep Operation

Dehumidifying

Basic Heating Operation

Reversing Valve Defrosting

Setting Defrosting Inhibit Period

Heating Sleep Operation

Refrigerating Cycle Diagram

Auto Swing Function

Description of Main Circuit Operation

1. Reset Circuit

Explanation of the microcomputer reset circuit functionality.

4. Auto Sweep Motor Circuit

5. Room Temperature Thermistor Circuit

6. Heat Exchanger Temperature Thermistor Circuit

7. Initial Setting Circuit (IC401)

1. Power Circuit

2. Indoor/Outdoor Interface Circuit

3. Power Module Circuit

4. Power Circuit for P.W.B.

5. Reversing Valve Control Circuit

6. Rotor Magnetic Pole Position Detection Circuit

7. Drive Circuit

8. HIC and Peripheral Circuits

9. Temperature Detection Circuit

10. Reset Circuit

11. Outdoor DC Fan Motor Control Circuit

12. Power Factor Control Circuit

Service Call Q & A

Cooling Mode

Troubleshooting common issues during cooling operation.

Dehumidifying Mode

Troubleshooting common issues during dehumidifying operation.

Heating Mode

Troubleshooting common issues during heating operation.

Others

Trouble Shooting

Precautions for Checking

Essential safety measures before troubleshooting.

Discharge Procedure and Power Shut Off Method for Power Circuit

Checking the Indoor/Outdoor Unit Electrical Parts and Refrigerating Cycle

Troubleshooting When Timer Lamp Blinks

Self-Diagnosis Lighting Mode

Interpreting self-diagnosis indicators for troubleshooting.

Self-Diagnosis Lighting Mode

Checking Indoor Unit Electrical Parts

1. Power Does Not Come On (No Operation)

Step-by-step guide for diagnosing power issues.

2. Outdoor Unit Does Not Operate (but Receives Remote Infrared Signal)

3. Only Indoor Fan Does Not Operate (Other is Normal)

4. Air Deflector Does Not Move (Others are Normal)

5. All Systems Stop After Operation Start (Indicators Also Off)

6. Check the Main P.W.B (Power Circuit)

Checking the Remote Controller

Checking the Outdoor Unit Electrical Parts

Power Circuit

Phenomenon 1 <Rotation Speed Does Not Increase>

Troubleshooting rotation speed issues in the power circuit.

Checking the Refrigerating Cycle

1. Troubleshooting Procedure (No Operation, No Heating, No Cooling)

Diagnostic steps for refrigeration cycle issues.

How to Check System Power Module

How to Operate Using the Service Switch the Outdoor Unit

How to Operate the Outdoor Unit Independently

System Power Module Diagnosis

Procedure for Disassembly and Reassembly

Indoor Unit RAS-50YH4

Steps for disassembling and reassembling the indoor unit.

4. Tangential Air Flow Fan and Fan Motor

Parts List and Diagram

Indoor Unit Model: RAS-50YH4

List and diagrams of parts for the indoor unit.

Outdoor Unit Model: RAC-50YH4

List and diagrams of parts for the outdoor unit.