Table Of Contents - Hitachi RAM-90QH5 Service Manual

Table of Contents

Table Of Contents1
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
Caution5
Specifications6
Specifications For Indoor Units Combination7
Dc Inverter System Multy Rac Ram0=-90Qh5 Cool/Heat Capacity Spec. For Indoor Units Combinations To Be Able To Operate Simultaneously8
5 Room Multi-Split Inverter Type Room Air Conditioner Possible Combination To Operate (Same Time Operation)8
Rating Condition (Dry Bulb/Wet Bulb)9
Five Inverter System Multi Rac Ram-90Qh5 Indoor Units Combinations To Be Able To Install10
Quadruple System Multi Rac Ram-90Qh5 Indoor Units Combinations To Be Able To Install11
Features13
New Refrigerant13
New Technology13
Refrigerant Piping Materials14
Servicing Tools15
Air Purging By Using Vacuum Pump16
Installation17
Pipe Length17
Hight Difference17
Connecting The Pipe18
Flare Adaptor For Piping18
Condensed Water Disposal Of Outdoor Unit19
When Using And Installing In Cold Areas19
Connection Of The Connecting Cords And Power Cord. (Outdoor Unit)20
Wiring Pattern20
Indoor Unit20
Construction And Dimensional Diagram21
Wiring Diagram22
Compressor Motor Specifications23
Main Parts Component24
Fan Motor Specifications24
Circuit Diagram - Remote Control25
Circuit Diagram - Model Ram-90Qh526
Block Diagram27
Basic Mode28
Basic Cooling Operation30
Cooling Sleep Operation31
Cooling Defrost31
Dehumidifying32
Dehumidifying Sleep Operation32
Heating Basic Operation33
Heating Sleep Operation34
Expansion Valves35
Compressor Rotation Speed35
Defrost36
Time Chart When Executing Defrost (Unit 1 And Unit 2 Operated, Unit 3, Unit 4 And Unit 5 Stopped)37
Auto-Fresh Defrost38
Forced Cooling39
Pocessing At Overheat Thermistor (Oh) High Temperature40
Restriction Start Conditions40
Restriction Release Condition (In Common For All)40
Refrigerating Cycle Diagram42
Description Of Main Circuit Operation43
Power Circuit43
Intelligent Power Module (Ipm)43
Active Module, Diode Stacks43
Smoothing Capacitor (C945 To C950, 400Μf, 450V)44
Smoothing Capacitor (C020, 270Μf, Dc 450V)44
Indoor/Outdoor Interface Circuit45
C001 To C014, C022 To C027, Nf Coil1 To Nf Coil3, Nf Coil445
Surge Absorber, Varistor 1, 2, 345
Inrush Protective Resistor (R002)45
Indoor / Outdoor Interface Circuit 146
Indoor / Outdoor Interface Circuit 247
Indoor / Outdoor Interface Circuit 348
Indoor / Outdoor Interface Circuit 449
Indoor / Outdoor Interface Circuit 550
System Power Module Circuit51
Voltages Waveforms Of Indoor / Outdoor Micro Computers (Outdoor To Indoor Communications)52
Voltages Waveforms Of Indoor / Outdoor Micro Computers (Indoor To Outdoor Communications)52
Power Supply Circuit53
System Power Module Circuit (U + Is Off, V – Is On)55
Reversing Valve Control Circuit56
Overload Control Circuit (Ovl Control Circuit)57
Reset Circuit58
Temperature Detection Circuit59
Name And Role Of Each Thermistor60
Correspondence Between Each Thermistor's Resistance And Temperature (Reference Value)60
Led Lighting Mode At The Thermistors Troubled61
Electric Expansion Valve62
Time Chart64
Power Factor Control Circuit66
Inspecting Outdoor Electrical Parts67
Inspection Method 168
Inspection Method 269
Inspection Method 372
How To Operate The Service Switch The Outdoor Unit73
How To Operate The Outdoor Unit Independently73
Precautions For Checking74
Trouble Shooting74
Discharge Procedure And How To Cut Off Power To Power Circuit75
Location Of Self-Diagnosis Lamp76
Lighting Mode Self-Diagnosis Lamp77
Troubleshooting Of The Intelligent Power Module (Ipm)78
Checking Power Module Using Tester79
Parts List And Diagram80