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Daikin
Air Conditioner
RX20K5V1B
Daikin RX20K5V1B User Manual
114 pages
Manual
Specs
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Service
Manual
[Applicable Models]
Inverter Pair: Heat Pump
Inverter Pair
Wall Mounted Type FTX/ATX-K Series
SiBE041525F
2
Table of Contents
Default Chapter
4
Table of Contents
4
Safety Cautions
7
Warnings and Cautions Regarding Safety of Workers
7
Warnings and Cautions Regarding Safety of Users
9
Icons Used
11
Part 1 - List of Functions
12
Functions
13
Part 2 - Specifications
15
Specifications
16
Part 3 - Printed Circuit Board Connector Wiring Diagram
17
Indoor Unit
18
20/25/35 Class
18
50/60/71 Class
20
Outdoor Unit
23
20/25/35 Class
23
50/60/71 Class
24
Part 4 - Functions and Control
25
Main Functions
26
Temperature Control
26
Frequency Principle
26
Airflow Direction Control
28
Fan Speed Control for Indoor Unit
29
Program Dry Operation
30
Automatic Operation
31
Thermostat Control
32
NIGHT SET Mode
33
ECONO Operation
33
Inverter POWERFUL Operation
34
Other Functions
35
Thermistor Functions
36
Control Specification
37
Mode Hierarchy
37
Frequency Control
38
Controls at Mode Changing / Start-Up
40
Compressor Protection Function
41
Discharge Pipe Temperature Control
42
Input Current Control
43
Freeze-Up Protection Control
44
Heating Peak-Cut Control
44
Outdoor Fan Control
45
Liquid Compression Protection Function
45
Defrost Control
46
Electronic Expansion Valve Control
47
Pressure Equalizing Control
48
Malfunctions
50
Part 5 - Remote Controller
51
Remote Controller
52
Part 6 - Service Diagnosis
54
General Problem Symptoms and Check Items
55
Troubleshooting with LED
56
Indoor Unit
56
Outdoor Unit
56
Service Diagnosis
57
Troubleshooting
60
Error Codes and Descriptions
60
Indoor Unit PCB Abnormality
61
Freeze-Up Protection Control / Heating Peak-Cut Control
62
Fan Motor (DC Motor) or Related Abnormality
63
Thermistor or Related Abnormality (Indoor Unit)
65
Low-Voltage Detection or Over-Voltage Detection
66
Signal Transmission Error (between Indoor Unit and Outdoor Unit)
68
Unspecified Voltage (between Indoor Unit and Outdoor Unit)
70
Outdoor Unit PCB Abnormality
71
OL Activation (Compressor Overload)
72
Compressor Lock
74
DC Fan Lock
75
Input Overcurrent Detection
76
Four Way Valve Abnormality
77
Discharge Pipe Temperature Control
79
High Pressure Control in Cooling
80
Compressor System Sensor Abnormality
81
Position Sensor Abnormality
82
Thermistor or Related Abnormality (Outdoor Unit)
84
Electrical Box Temperature Rise
86
Radiation Fin Temperature Rise
87
Output Overcurrent Detection
88
Check
90
Thermistor Resistance Check
90
Indoor Fan Motor Connector Output Check
91
Power Supply Waveforms Check
92
Electronic Expansion Valve Check
92
Four Way Valve Performance Check
93
Inverter Unit Refrigerant System Check
93
Inverter Analyzer Check
94
Rotation Pulse Check on the Outdoor Unit PCB
96
Installation Condition Check
97
Discharge Pressure Check
97
Outdoor Fan System Check
98
Main Circuit Short Check
98
Power Module Check
99
Part 7 - Trial Operation and Field Settings
101
Tips for Servicing
102
Pump down Operation
102
Forced Cooling Operation
102
Trial Operation
103
Field Settings
104
Temperature Display Switch
104
When 2 Units Are Installed in 1 Room
104
Silicone Grease on Power Transistor / Diode Bridge
105
Part 8 - Appendix
106
Piping Diagrams
107
Indoor Unit
107
Outdoor Unit
108
Wiring Diagrams
110
Indoor Unit
110
Outdoor Unit
112
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Daikin RX20K5V1B Specifications
General
Model
RX20K5V1B
Refrigerant
R32
Inverter
Yes
Star Rating
5 Star
Type
Split AC
Power Supply
220-240V, 50Hz
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