Table Of Contents - Hitachi RAM-71QH5 Service Manual

Table of Contents

Specifications1
Table Of Contents1
Service Manual1
Technical Information1
Room Air Conditioner1
Safety During Repair Work2
Working Standards For Preventing Breakage Of Semiconductors3
Scope3
Object Parts3
Items To Be Observed In Handling3
Features12
New Refrigerant12
Safety During Servicing12
Refrigerant Piping Materials13
Thickness Of Refrigerant Piping13
Flare's Expansion Pipe13
Flare Nut Dimensions13
Servicing Tools14
Servicing Work15
Installation16
Pipe Length16
Height Difference16
Connecting The Pipe17
Condensed Water Disposal Of Outdoor Unit18
When Using And Installing In Cold Areas18
Connection Of The Connecting Cords And Power Cord19
Grounding Rod19
Construction And Dimensional Diagram20
Main Parts Component21
Fan Motor21
Fan Motor Specifications21
Compressor Motor22
Compressor Motor Specifications22
Wiring Diagram23
Circuit Diagram24
Block Diagram25
Basic Mode26
Basic Cooling Operation28
Cooling Sleep Operation29
Cooling Defrost29
Dehumidifying30
Dehumidifying Sleep Operation30
Heating Basic Operation31
Heating Sleep Operation32
Expansion Valves33
Compressor Rotation Speed33
Defrost34
Defrost Start Condition34
Defrost Release Condition34
Outputs During Defrost34
Time Chart When Executing Defrost35
Auto-Fresh Defrost36
Start Conditions For Auto-Fresh36
Release Condition Of Auto-Fresh36
Outputs During Auto-Fresh36
Forced Cooling37
Execution Condition37
Operation Status37
Restriction Start Conditions38
Restriction Release Condition38
When One Unit Is Operated For Cooling38
Refrigerating Cycle Diagram40
Description Of Main Circuit Operation41
Power Circuit41
System Power Module41
Smoothing Capacitor42
Indoor/Outdoor Interface Circuit43
System Power Module Circuit48
Voltages Waveforms Of Indoor / Outdoor Micro Computers49
Switching Order Of Power Module50
Voltage Waveform At Each Point50
Power Supply Circuit51
Power Circuit For P.w.b.51
Reversing Valve Control Circuit54
Rotor Magnetic Pole Position Detection Circuit55
Peripheral Circuit Of Microcomputer56
Overload Control Circuit (Ovl Control Circuit)57
Overload Control System Configuration57
Reset Circuit58
Temperature Detection Circuit59
Name And Role Of Each Thermistor60
Led Lighting Mode At The Thermistors Troubled61
Electric Expansion Valve62
Power Factor Control Circuit63
Inspecting Outdoor Electrical Parts64
How To Operate Using The Service Switch The Outdoor Unit71
How To Operate The Outdoor Unit Independently71
Trouble Shooting72
Precautions For Checking72
Discharge Procedure And How To Cut Off Power To Power Circuit73
Lighting Mode Self-Diagnosis Lamp74
Location Of Self-Diagnosis Lamp74
Troubleshooting Of The System Power Module76
How To Check Power Module77
Checking Power Module Using Tester77
Checking The Refrigerating Cycle78
Electric Expansion Valve & Pipe Thermistor Position Charts79
Parts List And Diagram80
Outdoor Unit80