Hitachi RAS-18FH6 - DESCRIPTION OF MAIN CIRCUIT OPERATION; 6. Peripheral circuits of microcomputer; 6-1. Peak current cutoff circuit

Hitachi RAS-18FH6

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Table of Contents

Table of Contents1
Specifications1
Room Air Conditioner1
Technical Information1
Service Manual1
Safety During Repair Work2
Working Standards for Preventing Breakage of Semiconductors3
Scope3
Object Parts3
Items to be Observed in Handling3
Grounding a Soldering Iron4
Grounding of the Working Table4
Caution5
Specifications6
- Safety Precaution7
- Precautions During Installation7
- Precautions During Shifting or Maintenance7
- Precautions During Operation7
How to Use7
- Outdoor Unit8
- Indoor Unit Indications8
- Model Name and Dimensions8
- Indoor Unit8
- Automatic Operation9
- Remote Controller9
- Auto Restart Control9
- Heating Operation10
- Dehumidifying Operation10
- Defrosting10
- Cooling Operation11
- Fan Speed11
- How to Set the Timer12
Construction and Dimensional Diagram17
- Fan Motor19
- Main Electric Components for Outdoor Unit19
- Thermostat19
Main Parts Component19
- Compressor Motor20
- Compressor Motor Specifications20
Wiring Diagram21
Circuit Diagram22
Block Diagram24
Basic Mode25
- Basic Cooling Operation27
- Thermo Judgement27
- Compressor Speed27
- Cooling Sleep Operation28
- Cooling Defrost28
- Dehumidifying Sleep Operation28
- Basic Heating Operation29
- Heating Sleep Operation30
- Setting Defrosting Inhibit Period30
- Reversing Valve Defrosting30
- Refrigerating Cycle Diagram31
- Reset Circuit32
Description of Main Circuit Operation32
- Receiver Circuit33
- Buzzer Circuit33
- Buzzer Operation33
- Microcomputer Output Signals34
- Auto Sweep Motor Circuit34
- Initial Setting Circuit (IC401)35
- Power Supply35
- Fan Motor Drive Circuit36
- Power Circuit37
- Main Parts37
- Db237
- DB3, L1, C023 and L237
- SA1 and VS1 to VS338
- C021 and C02238
- C001 to C003, C011, L101, and L10238
- DB1 and C4138
- Indoor/Outdoor Interface Circuit39
- Indoor / Outdoor Interface Circuit40
- Voltages Waveforms of Indoor41
- Outdoor Microcomputers41
- Intelligent Power Module Circuit44
- Switching Order of Power Module45
- Voltage Waveform at each Point45
- Power Module Circuit46
- Drive Circuit47
- Check Points50
- Peripheral Circuits of Microcomputer51
- Peak Current Cutoff Circuit52
- Overload Control Circuit53
- Overload Control System53
- Is Ovl54
- ID Ovl54
- Start Current Control55
- Temperature Detection Circuit57
- Reversing Valve Control Circuit58
- Electric Expansion Valve Control Circuit59
- Outdoor DC Fan Motor Control Circuit60
- Cooling Mode62
- Dehumidifying Mode62
- Heating Mode62
Service Call Q & a62
- Auto Fresh Defrosting63
- Auto Operation63
- Nice Temperature Reservation63
- Infrared Remote Control63
- Others64
- Precautions for Checking65
Trouble Shooting65
- Discharge, Procedure and Power Shut off Method for Power Circuit66
- Discharge Procedure66
- Structure of an Indoor Unit Electric Parts67
- Removing Electrical Parts67
- Removing Control P.W.B.67
- Removing the Indicating P.W.B.67
- Cautions Concerning ICP (IC Protector)68
- The Support Function of Failure Diagnosis69
- Self-Diagnosis Lighting Mode70
- Remove the Compressor Connector72
- Checking the Indoor/Outdoor Unit Electrical Parts and Refrigerating73
- Checking the Indoor Unit Electrical Parts74
- Power Does Not Come on (no Operation)74
- Indoor Fan Does Not Operate (Others Are Normal)75
- Air Deflector Does Not Move (Others Are Normal)75
- Check the Control P.W.B. (Power Circuit)76
- Checking the Remote Controller77
- Checking Outdoor Unit Electrical Parts78
- HOW to CHANGE the SHIFT VALUE for SETTING TEMPERATURE85
- 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
- Diagnosis Procedure for Power Module Using Multimeter89
- Inverter Section89
- Front Panel90
- Front Cover90
- Control P .W.B. and Indicating P.W.B.90
Procedure for Disassembly and Reassembly90
- Tangential Air Flow Fan and Fan Motor91
- Electrical Parts91
Parts List and Diagram92

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