Hitachi RAC-50YH7 - Circuit Diagram

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– 35 –

CIRCUIT DIAGRAM

Remote Control

Table of Contents

Table of Contents1
Specifications1
Service Manual1
Technical Information1
Room Air Conditioner1
Safety During Repair Work2
Working Standards for Preventing Breakage of Semiconductors3
Grounding of the Working Table4
Grounding a Soldering Iron4
Cautions5
Specifications6
- Installation of Indoor and Outdoor Unit7
- Names and Functions of each Part8
- Dimensions8
- Temporary Switch9
- Operation Indicator9
- Indoor Unit Indicators9
- Safety Precautions11
- Precautions During Installation11
- Remote Control Unit13
- Automatic Operation14
- Auto Restart Control14
- Heating Operation15
- Defrosting15
- Dehumidifying Operation16
- Cooling Operation17
- Fan Operation18
- To Set the Timer19
- How to Cancel Reservation19
- To Set the Sleep Timer21
- To Exchange the Batteries in the Remote Controller22
- Circuit Breaker22
- The Ideal Ways of Operation23
- Suitable Room Temperature23
- The Air Conditioner and the Heat Source in the Room24
- Not Operating for a Long Time24
- When Lightning Occurs24
- Interference from Electrical Products24
- Attaching the Air Cleansing Filters25
- Maintenance26
- Air Filter26
- Washable Front Panel Removal/Attachment27
- Regular Inspection28
- Maintenance at Beginning of Long off Period28
Construction and Dimensional Diagram30
- Construction and Dimensional Diagram for Outdoor31
- Thermostat (Room Temperature Thermistor)32
- Indoor Fan Motor32
- Outdoor Fan Motor32
Main Parts Component32
Compressor Motor Specifications33
Wiring Diagram34
Circuit Diagram35
Printed Wiring Board Location Diagram38
- Block Diagram41
- Basic Mode42
- Mode Data File43
- Basic Cooling Operation44
- Cooling Defrost45
- Cooling Sleep Operation45
- Dehumidifying46
- Basic Heating Operation47
- Reversing Valve Defrosting48
- Heating Sleep Operation48
- Setting Defrosting Inhibit Period48
Refrigerating Cycle Diagram49
- Auto Swing Function50
- Reset Circuit51
Description of Main Circuit Operation51
- Receiver Circuit52
- Buzzer Circuit52
- Auto Sweep Motor Circuit53
- Room Temperature Thermistor Circuit54
- Heat Exchanger Temperature Thermistor Circuit54
- Initial Setting Circuit55
- Power Circuit56
- PWB for Power Circuit58
- Reversing Valve Control Circuit59
- Temperature Detection Circuit60
- Electric Expansion Valve Circuit61
- Outdoor DC Fan Motor Control Circuit62
- Checking Fan Motor Procedure63
- Cooling Mode64
- Dehumidifying Mode64
- Heating Mode64
Service Call Q & a64
- Auto Refresh Defrosting65
- Auto Operation65
- Nice Temperature Reservation65
- At Starting Operation66
- Precautions for Checking68
Trouble Shooting68
- Discharge Procedure and Method to Stop Energize the Power Circuit69
- Disconnection of Tab Terminal Receptacle70
- Disconnecting on Board Connector70
- Connector Disconnection During Discharge Is Prohibited70
- Checking the Indoor Timer Lamp if Blinking 1 Time71
- Checking the Indoor/Outdoor Unit Electrical Parts/Refrigerating Cycle72
- Troubleshooting When Timer Lamp Blinks73
- Self-Diagnosing Lighting Mode73
- Checking Indoor Unit Electrical Parts74
- Power Does Not Come on (no Operation)74
- Outdoor Unit Does Not Operate (but Receives Remote Infrared Signal)75
- All Systems Stop from Several Seconds to Several Minutes after Start76
- Air Deflector Does Not Move (Others Are Normal)76
- Only Indoor Fan Does Not Operate (Other Is Normal)76
- Check the Main P.W.B (Power Circuit)77
- Checking the Outdoor Unit Electrical Part78
- Self Check82
- To Operate Using Outdoor Unit Test Switch83
- Lighting Mode of Self-Diagnosis Lamp84
- Position of Self-Diagnosis Lamp84
- Checking the Remote Controller86
- Checking the Refrigerating Cycle87
- Troubleshooting Procedure (no Operation, no Heating, no Cooling)87
- Indor Unit Diagram88
Parts List and Diagram88
- Parts List89
- Outdoor Unit Diagram90
- Outdoor Unit Parts List91

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