SERVICE MANUAL - Inverter Wall Mounted Single Split - Part 5 - Safety Cautions

Oct 22, 2026

Uploaded by Aria

SERVICE MANUAL provides technical guidance for inverter wall mounted single split cooling only and heat pump models. It covers the product line-up, PCB connector wiring diagrams, piping length and elevation, outline and dimensions, and engineering data. The manual explains function and control including temperature control, operation modes (cooling, heating, dry, fan, auto), sleep/quiet/eco+/powerful features, communication between indoor and outdoor, sensor thermistors, off-time control, restart behaviors, and valve/fan/rotation and defrost operations. It also includes service diagnosis error indications and wiring, refrigerant diagrams, plus safety cautions.

LanguageEnglish

CategoryResearch & Report

FormatPDF

Pages84

Reading Time3 h 32 min

AccessFree to download

1.0 Inverter Single Split

1.1 Product line-up

1.2 Printed Circuit board (PCB) connector wiring diagram

1.3 Piping Length & Elevation

1.4 Outline & Dimension

1.5 Engineering Data

2.0 Function & Control

2.1 Temperature Control

2.2 Cooling and Heating Mode Operation

2.3 Dry Mode

2.4 Fan Mode

2.5 Auto Mode

2.6 Cold Draft Prevention

2.7 Sleep Mode

2.8 Quiet Function

2.9 Eco+ Function

2.10 Powerful Function

2.11 Indoor-Outdoor Communication

2.12 Thermistors in RK(X)B,RK(X)N

2.13 Minimum Off Time Control

2.14 Auto Restart

2.15 Auto Random Restart

2.16 Four Way Valve Control

2.17 Outdoor Fan Control

2.18 Rotation Regulating Functions

2.19 Defrost Cycle

2.20 Indoor Coil Freeze Prevention

2.21 High Pressure Protection

2.22 Discharge Pipe Temperature Control

2.23 Overall Current Control

2.24 Overall Frequency Control

3.0 Service Diagnosis

3.1 Error Indication from Indoor

3.2 Error Code retrieved by handset

3.3 Error code description for Inverter

4.0 Wiring Connection

5.0 Refrigerant Diagram

6.0 Appendix A

SERVICE MANUAL Inverter Wall Mounted Single Split MODELS Cooling Only FTKB09AXVJU FTKB12AXVJU FTKB18AXVJU FTKB24AXVJU FTKN09AXVJU FTKN12AXVJU FTKN18AXVJU FTKN24AXVJU Heatpump FTXB09AXVJU FTXB12AXVJU FTXB18AXVJU FTXB24AXVJU FTXN09AXVJU FTXN12AXVJU FTXN18AXVJU FTXN24AXVJU RKB09AXVJU RKB12AXVJU RKB18AXVJU RKB24AXVJU RKN09AXVJU RKN12AXVJU RKN18AXVJU RKN24AXVJU RXB09AXVJU RXB12AXVJU RXB18AXVJU RXB24AXVJU RXN09AXVJU RXN12AXVJU RXN18AXVJU RXN24AXVJU SM-5WM-Y-NA-B1 Table of Contents 1.0 Inverter Single Split...................................................................................................... 1 1.1 Product line-up ........................................................................................................ 1 1.2 Printed Circuit board (PCB) connector wiring diagram ............................................3 1.3 Piping Length & Elevation ..................................................................................... 10 1.4 Outline & Dimension .............................................................................................. 11 1.5 Engineering Data ................................................................................................... 15 2.0 Function & Control ..................................................................................................... 17 2.1 Temperature Control .............................................................................................. 17 2.2 Cooling and Heating Mode Operation ................................................................... 17 2.3 Dry Mode ............................................................................................................... 18 2.4 Fan Mode .............................................................................................................. 19 2.5 Auto Mode ............................................................................................................. 19 2.6 Cold Draft Prevention ............................................................................................ 19 2.7 Sleep Mode ...........................................................................................................20 2.8 Quiet Function........................................................................................................20 2.9 Eco+ Function.........................................................................................................20 2.10 Powerful Function.................................................................................................21 2.11 Indoor-Outdoor Communication ........................................................................21 2.12 Thermistors in RK(X)B,RK(X)N ..........................................................................22 2.13 Minimum Off Time Control ...................................................................................23 2.14 Auto Restart .........................................................................................................23 2.15 Auto Random Restart ..........................................................................................23 2.16 Four Way Valve Control .......................................................................................24 2.17 Outdoor Fan Control ............................................................................................24 2.18 Rotation Regulating Functions ............................................................................25 2.19 Defrost Cycle .......................................................................................................26 2.20 Indoor Coil Freeze Prevention .............................................................................27 2.21 High Pressure Protection.....................................................................................27 2.22 Discha

FAQs

What safety cautions must be followed before repair work?

Read the safety cautions before conducting repair work. Warning items are especially important because they can lead to death or serious injury if not followed, and caution items can also lead to serious accidents under some conditions. Observe all safety caution items described in the manual.

Which operating modes and functions are covered in the function and control section?

The manual covers temperature control and mode operations including cooling/heating, dry mode, fan mode, and auto mode. It also includes cold draft prevention, sleep mode, quiet function, Eco+ function, powerful function, and indoor-outdoor communication.

How does the manual guide service diagnosis when errors occur?

Service diagnosis includes error indication from indoor, error code retrieval by handset, and an error code description for the inverter. This sequence helps identify and interpret fault information for repair and troubleshooting.

Oct 22, 2026

Uploaded by Aria