Hitachi RAK-25NH4

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HITACHI

PM NO. 0174E

Printed in Malaysia

RAK-25NH4/RAC-25NH4

RAK-35NH4/RAC-35NH4

RAK-50NH4/RAC-50NH4

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Table of Contents1
Specifications1
Service Manual1
Technical Information1
Room Air Conditioner1
Safety During Repair Work2
Working Standards3
Scope3
Object Parts3
Items to be Observed in Handling3
Grounding of the Working Table4
Grounding a Soldering Iron4
Specifications6
- Direction of Piping7
- Installation of Indoor and Outdoor Unit7
- The Length of Indoor Unit Power Cord7
- Safety Precaution8
- Precautions During Installation8
- Precautions During Shifting or Maintenance8
- Precautions During Operation8
- Names and Functions of each Part10
- Indoor Unit10
- Temporary Switch11
- Indoor Unit Indicators11
- Operation Indicator11
- Names and Functions of Remote Control Unit12
- Various Functions13
- Automatic Operation13
- Auto Restart Control13
- Condition of Automatic Operation13
- Heating Operation14
- Dehumidifying Function15
- Dehumidifying Operation15
- Cooling Operation16
- Fan Operation17
- Fan Speed (Auto)17
- How to Set the Timer18
- How to Cancel Reservation18
- How to Set the Sleep Timer20
- Explanation of the Sleep Timer21
- Operation with the Sleep Timer21
- Adjusting the Air Deflector22
- Changing the Batteries in the Remote Controller23
- The Ideal Ways of Operation24
- For User's Information25
- The Air Conditioner and the Heat Source in the Room25
- Not Operating for a Long Time25
- When Lightning Occurs25
- Attaching the Air Cleansing and Deodorizing Filters26
- Maintenance27
- Air Filter27
- Washable Front Panel28
- Removing the Front Panel28
- Attaching the Front Panel28
- Regular Inspection29
- Maintenance at Beginning of Long off Period29
Construction and Dimensional Diagram31
- Construction and Dimensional Diagram for Outdoor32
- Thermostat Specifications33
- Fan Motor Specifications33
Main Parts Component33
- Compressor Motor Specifications34
- Wiring Diagram Indoor Unit35
- Outdoor Unit35
- Remote Control36
Circuit Diagram36
Printed Wiring Board Location Diagram39
Block Diagram41
Basic Mode42
- Mode Data File43
- Basic Cooling Operation44
- New Cool Rhythm45
- Cooling Sleep Operation45
- Cooling Defrost45
- Dehumidifying46
- Basic Heating Operation47
- Reversing Valve Defrosting48
- Heating Sleep Operation48
- Setting Defrosting Inhibit Period48
Refrigerating Cycle Diagram49
- Auto Swing Function51
- Reset Circuit52
Description of Main Circuit Operation52
- Receiver Circuit53
- Buzzer Circuit53
- Auto Sweep Motor Circuit54
- Room Temperature Thermistor Circuit55
- Heat Exchanger Temperature Thermistor Circuit55
- Initial Setting Circuit (IC401)56
- Power Circuit57
- Indoor/Outdoor Interface Circuit59
- Interface Circuit60
- Voltages Waveforms of Indoor / Outdoor Microcomputers61
- Outdoor Microcomputer to Indoor Microcomputer62
- Outdoor Message63
- Power Module Circuit64
- Voltage Waveform at each Point65
- Switching Order of Power Module65
- Power Circuit for P.W.B.67
- Reversing Valve Control Circuit69
- Rotor Magnetic Pole Position Detection Circuit70
- Drive Circuit71
- Low Speed Rotation Mode72
- High Speed Rotation Mode72
- HIC and Peripheral Circuits73
- Microcomputer and Peripheral Circuits73
- Overload Control Circuit75
- Overload External Judgement Circuit75
- Overload Control System Configuration75
- Voltage Amp. Circuit76
- Temperature Detection Circuit78
- Outdoor DC Fan Motor Control Circuit80
- Power Factor Control Circuit82
Service Call Q & a83
Precautions for Checking86
Trouble Shooting86
- Discharge Procedure and Power Shut off Method for Power Circuit87
- Checking the Electrical Parts and Refrigerating Cycle88
- Troubleshooting When Timer Lamp Blinks89
- Self-Diagnosis Lighting Mode89
- Wiring Diagram90
- Checking Indoor Unit Electrical Parts91
- Checking the Remote Controller95
- Checking the Outdoor Unit Electrical Parts96
- Checking the Refrigerating Cycle102
- How to Check System Power Module103
- How to Operate Using the Service Switch the Outdoor Unit104
- How to Operate the Outdoor Unit Independently104
- System Power Module Diagnosis105
Parts List and Diagram106

Hitachi RAK-25NH4 - Page 115

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