Hitachi RAS-18YH5 - Basic Mode

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RAS-18YH5

MODEL

Control P.W.B.

Indicating P.W.B. (Display)

Auto Sweep Motor

Light Receiving

Unit

IRR

– 21 –

Main Page

Table of Contents1
Room Air Conditioner1
Service Manual1
Technical Information1
How to Use1
- Working Standards for Preventing Breakage of Semiconductors3
- Items to be Observed in Handling3
- Conductive Container View3
- Body Earth Diagram3
- Grounding a Solder Iron4
- Safety Precautions7
- Dimensions8
- Product View8
- Names and Functions of each Part8
- Auto Restart Control9
- Automatic Operation9
- Remote Controller9
- Heating Operation10
- Dehumidifying Operation10
- Defrosting10
- Cooling Operation11
- Fan Operation11
- Fan Speed (Auto)11
Construction and Dimensional Diagram11
- How to Set the Timer12
- How to Cancel Reservation12
- How to Exchange the Batteries in the Remote Controller13
- How to Set the Sleep Timer13
- Adjusting the Air Deflectors13
Main Parts Component13
- Maintenance14
- Air Filter14
- Cleaning the Front Panel14
- Maintenance at Beginning of Long off Period14
- Regular Inspection15
- Capabilities15
- Various Functions15
- Timer Programming/Sleep Timer Operation15
Wiring Diagram15
Wiring Diagram of the Printed Wiring Board16
- Construction and Dimensional Diagram17
- Main Parts Components19
Ras-18Yh519
Rac-18Yh519
Wiring Diagram21
Block Diagram21
Wiring Diagram of the Printed Wiring Board22
Basic Mode23
- Block Diagram25
- Mode Data File27
- Basic Cooling Operation28
- Dehumidifying Sleep Operation Diagram29
- Dehumidifying Operation Diagram29
- Cooling Defrost Diagram29
- Cooling Sleep Operation Diagram29
- Basic Heating Operation Diagram30
- Reversing Valve Defrosting31
- Heating Sleep Operation31
- Setting Defrosting Inhibit Period31
Refrigerating Cycle Diagram32
Description of Main Circuit Operation33
- Power Circuit39
- Indoor/Outdoor Interface Circuit41
- Serial Communications Data45
- IPM (Intelligent Power Module)46
- IPM Drive Circuit49
- Power Circuit for PWB50
- The Voltage Specification of the Power Circuit51
- Microcomputer's Peripheral Circuits52
- Overload Control Circuit (OVL Control Circuit)52
- Start Current Control54
- Reset Circuit55
- Temperature Detection Circuit56
- Reserving Value Control Circuit57
- Electric Expansion Valve Control Circuit58
- Outdoor DC Fan Motor Control Circuit59
- Dehumidifying Mode61
- Heating Mode61
Service Call Q & a61
Precautions for Checking64
Trouble Shooting64
- Discharge Procedure and Power Shut off Method for Power Circuit65
- Structure of an Indoor Unit Electric Parts66
- Removing Electrical Parts66
- Removing Control P.W.B.66
- Removing the Indicating P.W.B.66
- Cautions Concerning ICP (IC Protector)67
- The Support Function of Failure Diagnosis68
- Troubleshooting When Timer Lamp Blinks69
- Self-Diagnosis Lighting Mode70
- Outdoor Unit - Remove the Compressor Connector71
- Checking the Indoor/Outdoor Unit Electrical Parts and Refrigerating72
- Checking the Indoor Unit Electrical Parts73
- Checking the Remote Controller76
- Removing the Pwbs77
- Checking Outdoor Unit Electrical Parts79
- Checking the Refrigerating Cycle86
- How to Operate Using the Service Switch the Outdoor Unit87
- How to Operate the Outdoor Unit Independently87
- IPM (Intelligent Power Module) Diagnosis88
- Indoor Unit for Disassembly and Reassembly90
- Front Panel90
- Front Cover90
- Exploded Views and Parts Lists92
Parts List and Diagram92

Hitachi RAS-18YH5 - Basic Mode

Table of Contents

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