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Hitachi Manuals
Air Conditioner
RAS-18FH6
Service manual
Table Of Contents - Hitachi RAS-18FH6 Service Manual
Room air conditioner
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Table Of Contents
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Contents
Table of Contents
Troubleshooting
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Table of Contents
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Table of Contents
Specifications
1
Table Of Contents
1
Service Manual
1
Technical Information
1
Room Air Conditioner
1
Safety During Repair Work
2
Working Standards For Preventing Breakage Of Semiconductors
3
Scope
3
Object Parts
3
Items To Be Observed In Handling
3
Grounding A Soldering Iron
4
Grounding Of The Working Table
4
Caution
5
Safety Precaution
7
Precautions During Installation
7
Precautions During Shifting Or Maintenance
7
Precautions During Operation
7
How To Use
7
Indoor Unit
8
Outdoor Unit
8
Indoor Unit Indications
8
Model Name And Dimensions
8
Automatic Operation
9
Remote Controller
9
Auto Restart Control
9
Heating Operation
10
Dehumidifying Operation
10
Defrosting
10
Cooling Operation
11
Fan Speed
11
How To Set The Timer
12
Construction And Dimensional Diagram
17
Main Parts Component
19
Thermostat
19
Fan Motor
19
Main Electric Components For Outdoor Unit
19
Compressor Motor
20
Compressor Motor Specifications
20
Wiring Diagram
21
Circuit Diagram
22
Block Diagram
24
Basic Mode
25
Basic Cooling Operation
27
Thermo Judgement
27
Compressor Speed
27
Cooling Sleep Operation
28
Cooling Defrost
28
Dehumidifying Sleep Operation
28
Basic Heating Operation
29
Reversing Valve Defrosting
30
Setting Defrosting Inhibit Period
30
Heating Sleep Operation
30
Refrigerating Cycle Diagram
31
Description Of Main Circuit Operation
32
Reset Circuit
32
Receiver Circuit
33
Buzzer Circuit
33
Buzzer Operation
33
Auto Sweep Motor Circuit
34
Microcomputer Output Signals
34
Initial Setting Circuit (Ic401)
35
Power Supply
35
Fan Motor Drive Circuit
36
Power Circuit
37
Main Parts
37
Db2
37
Db3, L1, C023 And L2
37
C021 And C022
38
Db1 And C41
38
C001 To C003, C011, L101, And L102
38
Sa1 And Vs1 To Vs3
38
Indoor/Outdoor Interface Circuit
39
Indoor / Outdoor Interface Circuit
40
Voltages Waveforms Of Indoor
41
Outdoor Microcomputers
41
Intelligent Power Module Circuit
44
Switching Order Of Power Module
45
Voltage Waveform At Each Point
45
Power Module Circuit
46
Drive Circuit
47
Check Points
50
Peripheral Circuits Of Microcomputer
51
Peak Current Cutoff Circuit
52
Overload Control Circuit
53
Overload Control System
53
Is Ovl
54
Id Ovl
54
Start Current Control
55
Temperature Detection Circuit
57
Reversing Valve Control Circuit
58
Electric Expansion Valve Control Circuit
59
Outdoor Dc Fan Motor Control Circuit
60
Service Call Q & A
62
Cooling Mode
62
Dehumidifying Mode
62
Heating Mode
62
Auto Fresh Defrosting
63
Auto Operation
63
Nice Temperature Reservation
63
Infrared Remote Control
63
Others
64
Trouble Shooting
65
Precautions For Checking
65
Discharge, Procedure And Power Shut Off Method For Power Circuit
66
Discharge Procedure
66
Structure Of An Indoor Unit Electric Parts
67
Removing Electrical Parts
67
Removing Control P.w.b.
67
Removing The Indicating P.w.b.
67
Cautions Concerning Icp (Ic Protector)
68
The Support Function Of Failure Diagnosis
69
Self-Diagnosis Lighting Mode
70
Remove The Compressor Connector
72
Checking The Indoor/Outdoor Unit Electrical Parts And Refrigerating
73
Checking The Indoor Unit Electrical Parts
74
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 Controller
77
Checking Outdoor Unit Electrical Parts
78
How To Change The Shift Value For Setting Temperature
85
Checking The Refrigerating Cycle
86
How To Operate Using The Service Switch The Outdoor Unit
87
How To Operate The Outdoor Unit Independently
87
Ipm (Intelligent Power Module) Diagnosis
88
Diagnosis Procedure For Power Module Using Multimeter
89
Inverter Section
89
Procedure For Disassembly And Reassembly
90
Front Panel
90
Front Cover
90
Control P .W.b. And Indicating P.w.b.
90
Tangential Air Flow Fan And Fan Motor
91
Electrical Parts
91
Parts List And Diagram
92
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This manual is also suitable for:
Rac-18yh6
Rac-25yh6
Ras-25fh6
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