Hitachi RAS-18FH6 Manuals

Manuals and User Guides for Hitachi RAS-18FH6. We have 1 Hitachi RAS-18FH6 manual available for free PDF download: Service Manual

Hitachi RAS-18FH6 Service Manual

Hitachi RAS-18FH6 Service Manual (97 pages)

Room air conditioner

Brand: Hitachi | Category: Air Conditioner | Size: 14.91 MB

Table of Contents

Table of Contents
1
Specifications
1
Room Air Conditioner
1
Technical Information
1
Service Manual
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
Specifications
6
How to Use
7
- Outdoor Unit
  8
- Indoor Unit Indications
  8
- Model Name and Dimensions
  8
- Indoor Unit
  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
- Fan Motor
  19
- Main Electric Components for Outdoor Unit
  19
- Thermostat
  19
Main Parts Component
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
- Heating Sleep Operation
  30
- Setting Defrosting Inhibit Period
  30
- Reversing Valve Defrosting
  30
- Refrigerating Cycle Diagram
  31
- Reset Circuit
  32
Description of Main Circuit Operation
32
- Receiver Circuit
  33
- Buzzer Circuit
  33
- Buzzer Operation
  33
- Microcomputer Output Signals
  34
- Auto Sweep Motor Circuit
  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
- SA1 and VS1 to VS3
  38
- C021 and C022
  38
- C001 to C003, C011, L101, and L102
  38
- DB1 and C41
  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
- Cooling Mode
  62
- Dehumidifying Mode
  62
- Heating Mode
  62
Service Call Q & a
62
- Auto Fresh Defrosting
  63
- Auto Operation
  63
- Nice Temperature Reservation
  63
- Infrared Remote Control
  63
- Others
  64
- Precautions for Checking
  65
Trouble Shooting
65
Procedure for Disassembly and Reassembly
90
- Tangential Air Flow Fan and Fan Motor
  91
- Electrical Parts
  91
Parts List and Diagram
92

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