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RAC-25CNH11
Hitachi RAC-25CNH11 Manuals
Manuals and User Guides for Hitachi RAC-25CNH11. We have
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Hitachi RAC-25CNH11 manual available for free PDF download: Service Manual
Hitachi RAC-25CNH11 Service Manual (108 pages)
ROOM AIR CONDITIONER INDOOR UNIT + OUTDOOR UNIT
Brand:
Hitachi
| Category:
Air Conditioner
| Size: 2.41 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
Object Parts
3
Items to be Observed in Handling
3
Conductive Container
3
Grounding of the Working Table
4
Grounding a Soldering Iron
4
Caution
5
Specifications
6
Direction of Piping
7
Dimension of Mounting Stand of the Outdoor Unit
7
The Length of Indoor Unit Connecting Cord
7
Precautions During Shifting or Maintenance
8
Precautions During Operation
8
Precautions During Installation
8
Safety Precaution
8
Names and Functions of each Part
10
Indoor Unit
10
Outdoor Unit
10
Operation Indicator
11
Indoor Unit Indicators
11
Names and Functions of Remote Control Unit
12
Remote Controller
12
Precautions for Use
12
Condition of Automatic Operation
13
Automatic Operation
13
Heating Operation
14
Dehumidifying Operation
15
Dehumidifying Function
15
Cooling Operation
16
Fan Operation
17
Fan Speed (Auto)
17
How to Set the Timer
18
How to Cancel Reservation
18
Time, Day, Month
18
OFF-Timer
18
How to Set the Sleep Timer
20
Operation with the Sleep Timer
21
Explanation of the Sleep Timer
21
Adjusting the Air Deflector
22
Adjustment of the Conditioned Air to the Left and Right
22
How to Exchange the Batteries in the Remote Controller
23
Temporary Switch
23
The Ideal Ways of Operation
24
Suitable Room Temperature
24
Install Curtain or Blinds
24
Ventilation
24
When Lightning Occurs
25
For User’s Information
25
Not Operating for a Long Time
25
The Air Conditioner and the Heat Source in the Room
25
Attaching the Air Cleansing and Deodorizing Filters
26
Maintenance
27
Air Filter
27
Washable Front Panel
28
Removing the Front Panel
28
Attaching the Front Panel
28
Maintenance at Beginning of Long off Period
29
Regular Inspection
29
When Asking for Service, Check the Following Points
30
Notes
30
Construction and Dimensional Diagram
31
Thermostat
32
Thermostat Specifications
32
Fan Motor Specifications
32
Main Parts Component
32
Compressor Motor Specifications
33
Compressor Motor
33
Wiring Diagram
34
Circuit Diagram
35
Block Diagram
37
Room Temp. Shift Value
38
Basic Mode
38
Basic Cooling Operation
40
Dehumidifying
41
Cooling Defrost
41
Cool Rhythm
42
Twmax
43
Speed Specification During Fixed Rotation Period
43
Basic Heating Operation
43
Reversing Valve Defrost
44
Auto Swing Function
45
Reset Circuit
46
Description of Main Circuit Operation
46
Receive Circuit
47
Buzzer Circuit
47
Buzzer Operation
47
Auto Sweep Motor Rotation
48
Auto Sweep Motor Circuit
48
Micro Computer Output Signals
48
Auto Sweep Motor Circuit (Horizontal Air Deflectors)
48
Room Temperature Thermistor Circuit
49
Heat Exchanger Temperature Thermistor Circuit
49
DC Fan Motor Drive Circuit
50
Fan Motor Set Wind Velocity and DC Voltage
51
Characteristics
51
12V Power Circuit
52
Diode Stacks
53
Reactor and Power Capacitor
53
Power Circuit
53
DC Voltmeter or Teste
54
Smoothing Capacitor
54
Inrush Protective Resistor
54
Indoor/Outdoor Interface Circuit
55
Voltages Waveforms of Indoor / Outdoor Micro Computers
57
Power Module Circuit
58
Switching Order of Power Module
59
Voltage Waveform at each Point
59
Power Module Circuit (U + Is ON, V – Is ON)
60
Power Circuit for P.W.B.
61
Shifting from off to on
61
During on Period
62
Shifting from on to off
62
During off Period
62
When Power Circuit for P.W.B. Is Estimated as Abnormal
63
Abnormal Only When Output of 5V Voltage Has Decreased
63
When 12V and 5V Voltage Are Abnormal
63
Reversing Valve Control Circuit
64
Rotor Magnetic Pole Position Detection Circuit
65
Forward Current Waveform at Point a
66
Upper Arm Drive Circuit
66
Drive Circuit
66
Waveform of Transistor Base Current
67
Lower Arm Drive Circuit
68
HIC and Peripheral Circuits
69
Micro Computer(AX-8E21) and Peripheral Circuits
69
Peak Current Cut off Circuit and Waveforms at each Section
70
Overload Control Circuit
71
Overload Control System Configuration
71
Voltage Amp. Circuit
72
During Overload Control
72
During Start Current Control
73
Circuits to Which Trip Signals Are Transferred
74
Trip Signal Synthesis Circuit
74
Temperature Detection Circuit
75
Cooling
77
Heating
77
Refrigerating Cycle Diagram
77
Service Call Q & a
78
Auto Operation
80
Wireless Remote Controller
81
Common/Others
81
Precautions for Checking
82
Trouble Shooting
82
Discharging Capacitors
83
Cutting off Power Supplied to the Power Circuit
83
Trouble Shooting When the Timer
86
Dehumidifying Lamp Blinks
86
Only the Indoor Unit Fan Does Not Operate
91
The Fan Speed of the Indoor Unit Fan Cannot be Changed
91
The Air Deflector Cannot be Moved
92
Operation Completely Stops Within a few Seconds Minutes after Starting
92
Is Battery Polarity Right?
93
Chekcing the Remote Control Switch
93
Using a Video Monitor
94
Using a Checker
94
Using the Test Card
94
Method for Diagnosis of Power Module
101
How to Check Power Module
102
Checking Power Module Using Tester
102
Checking the Refrigerating Cycle
103
Troubleshooting Procedure
103
Parts List and Diagram
104
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