Daikin RXH20CVMB7 - User Manual

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SiENBE04-512A

Service

Manual

Inverter Pair

Wall Mounted Type

C-Series - D-Series

SiENBE04-512A.book Page 1 Friday, October 5, 2007 1:49 PM

Table of Contents

Wall Mounted Type1
Table of Contents3
Introduction6
- Safety Cautions6
Part 1 List of Functions10
- List of Functions Part10
List of Functions11
- High Grade Models11
- Standard Grade Models13
- Non-Lnverter Models16
Part 2 Specifications18
Specifications19
- Cooling Only19
- Heat Pump25
Part 3 Printed Circuit Board Connector Wiring Diagram38
Printed Circuit Board Connector Wiring Diagram39
- Indoor Unit39
- Outdoor Unit / ARK(X)S-C41
- Outdoor Unit / RK(X)H-C, ARK(X)H-C, R(Y)N-C43
Part 4 Function and Control44
Main Functions45
- Frequency Principle45
- Power-Airflow Dual Flaps, Wide-Angle Louvres and Auto-Swing47
- Fan Speed Control for Indoor Units48
- Programme Dry Function49
- Automatic Operation50
- NIGHT SET Mode51
- Intelligent Eye52
- HOME LEAVE Operation54
- Inverter POWERFUL Operation55
- Other Functions56
Function of Thermistor57
- Heat Pump Model57
- Cooling Only Model58
Control Specification59
- Mode Hierarchy59
- Frequency Control60
- Controls at Mode Changing / Start-Up62
- Discharge Pipe Control63
- Input Current Control64
- Freeze-Up Protection Control64
- Heating Peak-Cut Control65
- Fan Control65
- Liquid Compression Protection Function 265
- Defrost Control66
- Electronic Expansion Valve Control67
- Target Discharge Pipe Temperature Control69
- Malfunctions70
- Forced Operation Mode71
- Additional Function71
- Facility Setting Jumper (Cooling at Low Outdoor Temperature)72
Part 5 System Configuration74
System Configuration75
Instruction76
- Safety Precautions76
  - Installation Site77
  - Electrical Work77
- Names of Parts78
- Outdoor Unit79
- Remote Control80
- Preparation before Operation81
- To Set the Clock83
- Auto Dry Cool Heat Fan Operation84
- To Change the Air Flow Rate Setting85
- Adjusting the Air Flow Direction86
- POWERFUL Operation88
- OUTDOOR UNIT SILENT Operation89
- HOME LEAVE Operation90
- INTELLIGENT EYE Operation92
- TIMER Operation94
  - To Use on Timer Operation95
  - To Combine on Timer and off Timer95
- Care and Cleaning96
  - Air Filter97
  - Before a Long Idle Period98
- Troubleshooting99
Part 6 Service Diagnosis104
Caution for Diagnosis105
Problem Symptoms and Measures106
Service Check Function107
Troubleshooting110
- Error Codes and Description110
- Indoor Unit PCB Abnormality111
- Freeze-Up Protection Control or High Pressure Control112
- Fan Motor (AC Motor) or Related Abnormality114
- Thermistor or Related Abnormality (Indoor Unit)115
- Signal Transmission Error (between Indoor and Outdoor Unit)116
- OL Activation (Compressor Overload)117
- Compressor Lock118
- DC Fan Lock119
- Input over Current Detection120
- Four Way Valve Abnormality121
- Discharge Pipe Temperature Control123
- High Pressure Control in Cooling124
- Position Sensor Abnormality126
- DC Voltage / Current Sensor Abnormality127
- Thermistor or Related Abnormality (Outdoor Unit)128
- Electrical Box Temperature Rise130
- Radiation Fin Temperature Rise132
- Output over Current Detection134
- Insufficient Gas136
- Over-Voltage Detection138
Check139
- How to Check139
- Four Way Valve Performance Check140
- Thermistor Resistance Check141
- Installation Condition Check142
- Discharge Pressure Check142
- Outdoor Unit Fan System Check143
- Power Supply Waveforms Check144
- Inverter Units Refrigerant System Check144
- Power Transistor Check145
- Hall IC Check146
Part 7 Removal Procedure148
Indoor Unit149
- Removal of Air Filter149
- Removal of Front Grille152
- Removal of Horizontal Blade and Vertical Blade155
- Removal of Switch Box, PC Board and Swing Motor157
- Removal of Heat Exchanger163
- Install of Drain Plug166
- Removal of Fan Rotor and Fan Motor167
Outdoor Unit / ARK(X)S-C171
- Removal of Panels and Fan Motor171
- Removal of Electrical Box178
- Removal of Reactor and Partition Plate180
- Removal of Sound Blanket182
- Removal of Four Way Valve184
- Removal of Compressor186
- Removal of PCB188
Outdoor Unit / RK(X)H-C, ARK(X)H-C, R(Y)N-C191
- Removal of External Panels191
- Removal of Bell Mouth194
- Removal of PCB195
- Removal of Electrical Box203
- Removal of Propeller Fan and Fan Motor206
- Removal of Compressor Sound Insulation Pad209
- Removal of Compressor218
- Removal of Four Way Valve221
- Removal of Electronic Expansion Valve224
Part 8 Others226
Others227
- Test Run from the Remote Control227
- Jumper Settings228
Part 9 Appendix230
Piping Diagrams231
- Indoor Units231
- Outdoor Units232
Wiring Diagrams238
- Indoor Units238
- Outdoor Units239
Index242
Drawings & Flow Charts246

Questions and Answers

J
Joseph CannonAug 6, 2025
Why is the cooling or heating effect poor in my Daikin RXH20CVMB7?
- N
  Nancy MckenzieAug 6, 2025
  If your Daikin Air Conditioner isn't cooling or heating well, check these: * Ensure the air filters are clean. * Remove any obstructions blocking the air inlet or outlet of the indoor and outdoor units. * Verify the temperature setting is correct. * Make sure all windows and doors are closed. * Confirm the airflow rate and direction are appropriately set. * Check if the unit is set to INTELLIGENT EYE mode.
M
Matthew NguyenAug 11, 2025
What to do if my Daikin RXH20CVMB7's heating stops suddenly and I hear a flowing sound?
- J
  James JohnstonAug 11, 2025
  If the heating operation of your Daikin Air Conditioner stops suddenly and you hear a flowing sound, wait for about 3 to 8 minutes.
M
Ms. Brenda Martinez PhDAug 17, 2025
What to do if my Daikin RXH20CVMB7 does not operate and the OPERATION lamp is off?
- J
  Jeffrey HolmesAug 17, 2025
  If your Daikin Air Conditioner isn't turning on (OPERATION lamp is off), consider the following: * Check if a breaker has tripped or a fuse has blown. * Verify there isn't a power failure. * Ensure batteries are correctly installed in the remote control. * Confirm the timer setting is accurate.
K
knappjanetAug 21, 2025
What to do if my Daikin RXH20CVMB7 Air Conditioner stops suddenly and the OPERATION lamp flashes?
- O
  Olivia PorterAug 21, 2025
  If your Daikin Air Conditioner stops suddenly and the OPERATION lamp flashes, clean the air filters or remove any obstacles. Turn the breaker OFF, then turn it back ON, and try operating the air conditioner with the remote control. If the lamp continues to flash, it is recommended to call the service shop where you bought the air conditioner.
R
Renee ValenciaAug 27, 2025
Why did my Daikin Air Conditioner stop suddenly, but the OPERATION lamp is on?
- A
  andersonthomasAug 27, 2025
  If your Daikin Air Conditioner stopped suddenly and the OPERATION lamp is on, it might be due to a large voltage fluctuation, which triggers a system protection mechanism. The unit will automatically resume operation in approximately 3 minutes.
T
Tyler ZamoraSep 1, 2025
How to get rid of odor from my Daikin Air Conditioner indoor unit?
- S
  Sarah HebertSep 1, 2025
  If your Daikin Air Conditioner's indoor unit emits an odor, it is recommended to have the indoor unit cleaned by a technician. Consult the service shop where you purchased the air conditioner.

Summary

Part 1 List of Functions

High Grade Models

Details functions specific to high-grade models.

Standard Grade Models

Details functions for standard grade models.

Part 2 Specifications

Cooling Only

Technical specifications for cooling-only operation.

Heat Pump

Technical specifications for heat pump operation.

Part 3 Printed Circuit Board Connector Wiring Diagram

Indoor Unit Wiring Diagram

Wiring diagram for the indoor unit's PCB and connectors.

Outdoor Unit Wiring Diagram

Wiring diagrams for outdoor units (ARK(X)S-C series).

Part 4 Function and Control

Main Functions

Explains core operational features and principles.

Control Specification

Details the system's control logic and specifications.

Part 5 System Configuration

Safety precautions

Essential safety measures for operation and handling.

Troubleshooting

Troubleshooting steps for common operational issues.

Part 6 Service Diagnosis

Problem Symptoms and Measures

Common issues and their corresponding solutions.

Troubleshooting

Detailed troubleshooting steps for various error codes.

Part 7 Removal Procedure

Indoor Unit Removal

Procedures for removing components from the indoor unit.

Outdoor Unit Removal

Procedures for removing parts from outdoor units (ARK(X)S-C).

Part 8 Others

Jumper Settings

Configuration options via jumpers on the PCB.

Part 9 Appendix

Piping Diagrams

Diagrams illustrating refrigerant piping configurations.

Wiring Diagrams

Diagrams showing electrical connections and wiring.

Daikin RXH20CVMB7 Specifications

General

Brand	Daikin
Model	RXH20CVMB7
Category	Air Conditioner
Language	English

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