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Section 1: SPECIFICATIONS ................................................................................................. I-1
1-1 Unit Specifications .......................................................................................... I-2
1-2 Major Component Specifications .................................................................. I-27
1-3 Other Component Specifications .................................................................. I-47
1-4 Dimensional data .......................................................................................... I-63
1-5 Refrigerant Flow Diagram ............................................................................. I-74
1-6 Operating Range .......................................................................................... I-75
1-7 Heating Capacity .......................................................................................... I-76
1-8 Noise Criterion Curves.................................................................................. I-77
1-9 Increasing the Fan Speed ............................................................................. I-82
1-10 Air throw distance chart ................................................................................ I-83
1-11 Installation Instructions.................................................................................. I-86
1-12 Electrical Wiring ............................................................................................ I-98
1-13 Using Wireless Remote Controller with Wall-mounted Indoor Unit ............. I-102
Section 2: PROCESSES AND FUNCTIONS......................................................................... II-1
2-1 Room Temperature Control ............................................................................ II-2
2-2 Cold Draft Prevention (Heating Cycle) ........................................................... II-4
2-3 Automatic Fan Speed (Indoor Unit) ................................................................ II-5
2-4 Control Functions........................................................................................... II-6
2-5 Outdoor Unit Control PCB .............................................................................. II-9
2-6 Outdoor Unit Control PCB (CR-CH4272R) .................................................. II-10
Section 3: ELECTRICAL DATA ............................................................................................ III-1
3-1 Indoor Units................................................................................................... III-2
3-2 Outdoor Units .............................................................................................. III-16
Section 4: SERVICE PROCEDURES ..................................................................................IV-1
4-1 Meaning of Alarm Messages.........................................................................IV-2
4-2 Symptoms and Parts to Inspect .....................................................................IV-5
4-3 Details of Alarm Messages ...........................................................................IV-8
4-4 Table of Thermistor Characteristics .............................................................IV-14
Section 5:
OUTDOOR UNIT MAINTENANCE REMOTE CONTROL ...............................................
V-1
5-1 Overview ....................................................................................................... V-2
5-2 Functions ...................................................................................................... V-2
5-3 Normal Display Operations and Functions ................................................... V-3
5-4 Monitoring Operations: Display of Indoor Unit and Outdoor Unit Sensor
Temperatures ................................................................................................ V-6
5-5 Monitoring the Outdoor Unit Alarm History: Display of Outdoor Unit
Alarm History ................................................................................................ V-7
5-6 Setting Modes: Setting the Outdoor Unit EEPROM ....................................... V-7
Section 6: TEST RUN .......................................................................................................... VI-1
6-1 Preparing for Test Run ................................................................................. VI-2
6-2 Caution ........................................................................................................ VI-3
6-3 Test Run Procedure ..................................................................................... VI-3
6-4 Items to Check Before the Test Run ............................................................. VI-4
6-5 Test Run Using the Remote Controller......................................................... VI-4
6-6 Precautions .................................................................................................. VI-4
6-7 Table of Self-Diagnostic Functions and Corrections (X, T, U, K Type) .......... VI-5
6-8 Examples of Wiring Diagrams ...................................................................... VI-6
Contents