Daikin FTKM-U Series User manual

Service
Manual
SiMX042215E
Service Manual / Inverter Pair Wall Mounted Type FTKM-U Series SiMX042215E
Inverter Pair
Wall Mounted Type FTKM-U Series
[Applied Models]
Inverter Pair : Cooling Only

SiMX042215E
iTable of Contents
Introduction .................................................................................... 1
1. Safety Cautions.......................................................................................2
1.1 Warnings and Cautions Regarding Safety of Workers.............................2
1.2 Warnings and Cautions Regarding Safety of Users.................................8
2. Icons Used ............................................................................................10
3. Revision History ....................................................................................11
Part 1 General Information .......................................................... 12
1. Applicable Models .................................................................................13
2. Functions...............................................................................................14
Part 2 Specifications.................................................................... 15
1. Specifications ........................................................................................16
Part 3 Printed Circuit Board Connector Wiring Diagram............. 18
1. Indoor Unit.............................................................................................19
2. Outdoor Unit..........................................................................................21
2.1 12 Class .................................................................................................21
2.2 18 Class .................................................................................................22
2.3 24 Class .................................................................................................23
Part 4 Functions and Control ....................................................... 25
1. Main Functions......................................................................................26
1.1 Temperature Control ..............................................................................26
1.2 Frequency Principle................................................................................26
1.3 Airflow Direction Control.........................................................................28
1.4 Fan Speed Control for Indoor Unit .........................................................29
1.5 COANDA Operation ...............................................................................29
1.6 Program Dry Operation ..........................................................................30
1.7 Thermostat Control.................................................................................31
1.8 GOOD SLEEP OFF TIMER ...................................................................31
1.9 SMELL PROOF Operation .....................................................................31
1.10 Flash Streamer Air Purifying Operation..................................................32
1.11 ECONO Operation ................................................................................33
1.12 POWERFUL Operation ..........................................................................33
1.13 Dew Clean Operation .............................................................................34
1.14 Default Set Temperature Setting............................................................35
1.15 Other Functions......................................................................................35
2. Thermistor Functions ............................................................................36
3. Control Specification .............................................................................37
3.1 Mode Hierarchy ......................................................................................37
3.2 Frequency Control..................................................................................37
3.3 Controls at Mode Changing/Start-up......................................................39
3.4 Discharge Pipe Temperature Control.....................................................39
3.5 Input Current Control..............................................................................40
3.6 Freeze-up Protection Control .................................................................41
3.7 Outdoor Fan Control...............................................................................41
3.8 Liquid Compression Protection Function................................................42

SiMX042215E
Table of Contents ii
3.9 Electronic Expansion Valve Control .......................................................42
3.10 Malfunctions ...........................................................................................45
Part 5 Remote Controller ............................................................. 46
1. Applicable Remote Controller ...............................................................47
2. ARC484B41 ..........................................................................................48
Part 6 Service Diagnosis .............................................................. 49
1. General Problem Symptoms and Check Items .....................................51
2. Troubleshooting with LED .....................................................................52
2.1 Indoor Unit..............................................................................................52
2.2 Outdoor Unit ...........................................................................................52
3. Service Diagnosis .................................................................................53
3.1 Method 1 ................................................................................................53
3.2 Method 2 ................................................................................................54
4. Troubleshooting ....................................................................................56
4.1 Error Codes and Description ..................................................................56
4.2 Indoor Unit PCB Abnormality .................................................................57
4.3 Freeze-up Protection Control .................................................................58
4.4 Indoor Fan Motor (DC Motor) or Related Abnormality ...........................59
4.5 Thermistor or Related Abnormality (Indoor Unit)....................................61
4.6 Refrigerant Shortage ..............................................................................62
4.7 Low-voltage Detection or Over-voltage Detection..................................64
4.8 Signal Transmission Error (Between Indoor Unit and Outdoor Unit)......66
4.9 Unspecified Voltage (Between Indoor Unit and Outdoor Unit) ...............68
4.10 Outdoor Unit PCB Abnormality...............................................................69
4.11 OL Activation (Compressor Overload) ...................................................70
4.12 Compressor Lock ...................................................................................72
4.13 DC Fan Lock ..........................................................................................73
4.14 Input Overcurrent Detection ...................................................................74
4.15 Discharge Pipe Temperature Control.....................................................75
4.16 High Pressure Control in Cooling ...........................................................77
4.17 System Shutdown due to Temperature Abnormality in Compressor .....79
4.18 Compressor System Sensor Abnormality ..............................................80
4.19 Position Sensor Abnormality ..................................................................81
4.20 DC Voltage/Current Sensor Abnormality................................................83
4.21 Thermistor or Related Abnormality (Outdoor Unit).................................84
4.22 Electrical Box Temperature Rise............................................................85
4.23 Radiation Fin Temperature Rise ............................................................86
4.24 Output Overcurrent Detection ................................................................87
4.25 Error Codes None ..................................................................................89
5. Check ....................................................................................................90
5.1 Thermistor Resistance Check ................................................................90
5.2 Indoor Fan Motor Connector Check.......................................................91
5.3 Power Supply Waveform Check.............................................................92
5.4 Electronic Expansion Valve Check.........................................................92
5.5 Inverter Unit Refrigerant System Check.................................................93
5.6 Inverter Analyzer Check .........................................................................93
5.7 Outdoor Fan Motor Check......................................................................95
5.8 Installation Condition Check...................................................................96

SiMX042215E
iii Table of Contents
5.9 Discharge Pressure Check.....................................................................96
5.10 Outdoor Fan System Check ...................................................................97
5.11 Main Circuit Short Check........................................................................97
5.12 Power Module Check .............................................................................99
Part 7 Trial Operation and Field Settings .................................. 101
1. Pump Down Operation........................................................................102
2. Forced Cooling Operation ...................................................................103
3. Trial Operation ....................................................................................104
4. Field Settings ......................................................................................105
4.1 When 2 Units are Installed in 1 Room..................................................105
5. Silicone Grease on Power Transistor/Diode Bridge............................106
Part 8 Appendix .......................................................................... 107
1. Piping Diagrams..................................................................................108
1.1 Indoor Unit............................................................................................108
1.2 Outdoor Unit .........................................................................................109
2. Wiring Diagrams..................................................................................110
2.1 Indoor Unit............................................................................................110
2.2 Outdoor Unit .........................................................................................111
3. Operation Limit....................................................................................114

SiMX042215E
Introduction 1
1. Safety Cautions.......................................................................................2
1.1 Warnings and Cautions Regarding Safety of Workers.............................2
1.2 Warnings and Cautions Regarding Safety of Users.................................8
2. Icons Used ............................................................................................10
3. Revision History ....................................................................................11
Introduction

Safety Cautions SiMX042215E
2Introduction
1. Safety Cautions
Be sure to read the following safety cautions before conducting repair work.
After the repair work is complete, be sure to conduct a test operation to ensure that the
equipment operates normally, and explain the cautions for operating the product to the
customer.
Caution Items The caution items are classified into Warning and Caution. The Warning items are
especially important since death or serious injury can result if they are not followed closely. The
Caution items can also lead to serious accidents under some conditions if they are not
followed. Therefore, be sure to observe all the safety caution items described below.
Pictograms This symbol indicates an item for which caution must be exercised.
The pictogram shows the item to which attention must be paid.
This symbol indicates a prohibited action.
The prohibited item or action is shown in the illustration or near the symbol.
This symbol indicates an action that must be taken, or an instruction.
The instruction is shown in the illustration or near the symbol.
1.1 Warnings and Cautions Regarding Safety of Workers
This manual is for the
person in charge of
maintenance and
inspection.
This appliance is
filled with R-32.
Warning
Do not store equipment in a room with fire sources (e.g., naked
flames, gas appliances, electric heaters).
Be sure to disconnect the power cable from the socket before
disassembling equipment for repair.
Working on equipment that is connected to the power supply may cause
an electrical shock.
If it is necessary to supply power to the equipment to conduct the repair or
inspect the circuits, do not touch any electrically charged sections of the
equipment.
If refrigerant gas is discharged during repair work, do not touch the
discharged refrigerant gas.
Refrigerant gas may cause frostbite.
When disconnecting the suction or discharge pipe of the
compressor at the welded section, evacuate the refrigerant gas
completely at a well-ventilated place first.
If there is gas remaining inside the compressor, the refrigerant gas or
refrigerating machine oil discharges when the pipe is disconnected, and it
may cause injury.
If refrigerant gas leaks during repair work, ventilate the area.
Refrigerant gas may generate toxic gases when it contacts flames.
Be sure to discharge the capacitor completely before conducting
repair work.
The step-up capacitor supplies high-voltage electricity to the electrical
components of the outdoor unit.
A charged capacitor may cause an electrical shock.

SiMX042215E Safety Cautions
Introduction 3
Do not turn the air conditioner on or off by plugging in or
unplugging the power cable.
Plugging in or unplugging the power cable to operate the equipment may
cause an electrical shock or fire.
Be sure to wear a safety helmet, gloves, and a safety belt when
working in a high place (more than 2 m).
Insufficient safety measures may cause a fall.
In case of R-32 / R-410A refrigerant models, be sure to use pipes,
flare nuts and tools intended for the exclusive use with the R-32 /
R-410A refrigerant.
The use of materials for R-22 refrigerant models may cause a serious
accident, such as a damage of refrigerant cycle or equipment failure.
Do not mix air or gas other than the specified refrigerant (R-32 /
R-410A / R-22) in the refrigerant system.
If air enters the refrigerant system, an excessively high pressure results,
causing equipment damage and injury.
Caution
Do not repair electrical components with wet hands.
Working on the equipment with wet hands may cause an electrical shock.
Do not clean the air conditioner with water.
Washing the unit with water may cause an electrical shock.
Be sure to provide an earth / grounding when repairing the
equipment in a humid or wet place, to avoid electrical shocks.
Be sure to turn off the power switch and unplug the power cable
when cleaning the equipment.
The internal fan rotates at a high speed, and may cause injury.
Be sure to conduct repair work with appropriate tools.
The use of inappropriate tools may cause injury.
Be sure to check that the refrigerating cycle section has cooled
down enough before conducting repair work.
Working on the unit when the refrigerating cycle section is hot may cause
burns.
Conduct welding work in a well-ventilated place.
Using the welder in an enclosed room may cause oxygen deficiency.
Warning

Safety Cautions SiMX042215E
4Introduction
Checking the area
Before beginning work, conduct safety checks to minimise the risk of ignition. When
repairing the refrigerating system, take the following precautions before work.
Work procedure
Work shall be conducted under a controlled procedure so as to minimise the risk of working
in the presence of R-32 or vapour.
General working area
All maintenance staff and others working in the local area shall be instructed on the nature of
work being carried out.
Work in confined spaces shall be avoided.
The area around the workspace shall be sectioned off. Ensure that the conditions within the
area have been made safe by control of flammable materials.
Checking for presence of refrigerant
The working area shall be checked with an appropriate refrigerant detector before and
during work, to ensure the technician is aware of potentially flammable atmospheres.
Ensure that the leak detection equipment being used is suitable for use with R-32, i.e.
non-sparking, adequately sealed or intrinsically safe.
Fire extinguishing equipment
If any hot work is to be conducted on the refrigeration equipment or any associated parts,
appropriate fire extinguishing equipment shall be made available at hand. Prepare a dry
powder or CO2 fire extinguisher adjacent to the working area.
No ignition sources
During work on a refrigeration system which involves exposing any piping work that contains
or has contained R-32, any sources of ignition shall not be used in a manner that may lead
to the risk of fire or explosion. All possible ignition sources, including cigarette smoking,
should be kept at a safe distance from the site of installation, repairing, or removing space.
Before starting work, the area around the equipment shall be examined to make sure that
there are no flammable hazard or ignition risks. No Smoking signs shall be displayed.
Ventilated area
Ensure that the working area is open or that it is adequately ventilated before work.
Adequate ventilation shall be maintained during the entire period of work.
The ventilation should disperse any released refrigerant and preferably discharge it into the
external atmosphere.
Checking the refrigeration equipment
Where electrical components are to be changed, the new components shall be fit for the
purpose and have the correct specifications.
The manufacturer's maintenance and service guidelines shall be followed at all times.
If there are any unclear points, consult the manufacturer's technical department for
assistance.
The following checks shall be applied to any installation work involving R-32:
The amount of charge is in accordance with the size of the room where the refrigerant
containing parts are installed;
The ventilation machinery and outlets are operating adequately and are not obstructed;
If an indirect refrigerating circuit is being used, the secondary circuit shall be checked for
the presence of refrigerant;
Marking on the equipment is visible and legible. Markings and signs that are illegible
shall be corrected;
Refrigeration pipes or components are installed in a position where they are unlikely to
be exposed to any substance which may corrode refrigerant containing components, or
the refrigerant containing components are constructed of materials which are inherently
resistant to corrosion or are suitably protected against corrosion.

SiMX042215E Safety Cautions
Introduction 5
Checking electrical devices
Repair and maintenance to electrical components shall include initial safety checks and
component inspection procedures. In case there is any fault that could endanger safety, no
electrical supply shall be connected to the circuit until the fault is satisfactorily dealt with.
Initial safety checks shall include:
that capacitors are discharged: this shall be done in a safe manner to avoid possibility of
sparking;
that no live electrical components and wiring are exposed while charging, recovering or
purging the system;
that the equipment is earthed at all times.
Repairs to sealed components
During repairs to sealed components, all electrical supplies shall be disconnected from the
equipment being worked upon before the removal of any sealed covers, etc. If it is absolutely
necessary to have power supplied to equipment during servicing, continuously operating
leak detection shall be installed at the most dangerous point of the system in order to warn of
a potentially hazardous situation.
Particular attention shall be paid to the following: ensure that working on electrical
components does not alter the casing in such a way that affects the level of protection
including damage to cables, excessive number of connections, terminals different from the
original specification, damage to seals, incorrect fitting of glands, etc.
Ensure that the equipment is mounted securely.
Ensure that seals or sealing materials have not degraded such that they no longer serve the
purpose of preventing the ingression of flammable atmospheres. Replacement parts shall be
in accordance with the manufacturer's specifications.
The use of silicon sealant may inhibit the effectiveness of some types of leak detection
equipment. Intrinsically safe components do not have to be isolated before working on them.
Repair to intrinsically safe components
Do not apply any permanent inductive or capacitance load to the circuit without ensuring that
this will not exceed the permissible voltage and current for the equipment in use.
Only intrinsically safe components can be worked on in the presence of a flammable
atmosphere.
The test apparatus shall be of correct rating.
Replace components only with parts specified by the manufacturer. Using other parts may
result in ignition of the refrigerant leaked into the atmosphere.
Wiring
Check that wiring is not subject to wear, corrosion, excessive pressure, vibration, sharp
edges or any other adverse environmental effects. The check shall also take into account
the effects of ageing or continuous vibration from sources such as compressors or fans.
Detecting of R-32
Under no circumstances shall potential sources of ignition be used in the search for or
detection of refrigerant leaks. A halide torch (or any other detector using a naked flame) shall
not be used.

Safety Cautions SiMX042215E
6Introduction
Leak detection methods
The following leak detection methods can be applied for systems containing R-32.
Electronic leak detectors shall be used to detect R-32, but the sensitivity may not be
adequate or may need re-calibration (detection equipment shall be calibrated in a
refrigerant-free area). Ensure that the detector is not a potential source of ignition and that it
is suitable for the refrigerant used. Leak detection equipment shall be set to the percentage
of the lower flammability limit (LFL) of the refrigerant and calibrated to fit the refrigerant
employed. The appropriate percentage of gas (maximum 25%) shall be confirmed.
Leak detection fluids are suitable for use with most refrigerants but the use of detergents
containing chlorine shall be avoided as the chlorine may react with the refrigerant and
corrode the copper piping work.
If a leak is suspected, all naked flames shall be removed or extinguished.
If a refrigerant leakage which requires brazing is found, all of the refrigerant shall be
recovered from the system, or isolated (by means of shut off valves) in a part of the system
remote from the point of the leakage. Oxygen free nitrogen (OFN) shall then be purged
through the system both before and during the brazing process.
Removal and evacuation
When breaking the refrigerant circuit to make repairs or any other purpose, conventional
procedures may be used. However, flammability must be taken into consideration. The
following procedure shall be adhered to:
Remove refrigerant;
Purge the circuit with inert gas;
Evacuate the inert gas;
Purge again with inert gas;
Carry out cutting or brazing of the circuit.
The refrigerant shall be recovered into the correct recovery cylinders. The system shall be
cleaned with OFN to render the unit safe. (= Flushing) This process may need to be
repeated several times. Compressed air or oxygen shall not be used for this task.
Flushing shall be achieved through breaking the vacuum by filling the system with OFN until
the working pressure is achieved, then venting the OFN into the atmosphere, and finally
pulling the system down to vacuum again. This process shall be repeated until no refrigerant
remains within the system. After the last OFN charge is finished, the system shall be vented
down to atmospheric pressure to enable work. This operation is especially important if
brazing operations on the piping work are to take place.
Ensure that the outlet for the vacuum pump is not close to any ignition sources and that
there is ventilation available.
Charging procedures
In addition to conventional charging procedures, the following requirements shall be met.
Ensure that the charging equipment to be used is not contaminated by different refrigerants.
Hoses or lines shall be as short as possible to minimise the amount of refrigerant contained
in them.
Cylinders shall be kept upright.
Ensure that the refrigeration system is earthed before charging the system with
refrigerant.
Label the system when charging is complete (if not already).
Extreme care shall be taken not to overfill the refrigeration system.
Before recharging, the system shall be tested for leakage with OFN. On completion of
charging, the system shall be tested before commissioning. Follow up leakage test shall be
carried out before leaving the site.

SiMX042215E Safety Cautions
Introduction 7
Decommissioning
Before carrying out this procedure, it is essential that the technician is completely familiar
with the equipment and all its details. It is recommended to train technicians so that all of the
refrigerant is recovered safely. In case analysis is required before re-using the reclaimed
refrigerant, an oil and refrigerant sample shall be taken before proceeding with
decommissioning. It is essential that electrical power is available before work.
(1) Comprehend the equipment and its operation.
(2) Isolate the system electrically.
(3) Before starting work, ensure that:
mechanical handling equipment is available if required, for handling refrigerant
cylinders;
protective equipment can be used in compliance with specifications;
the recovery process is supervised by a competent person at all times;
recovery equipment and cylinders conform to the appropriate standards.
(4) Pump down the refrigerant system, if possible.
(5) If vacuum cannot be ensured, apply a manifold so that refrigerant can be removed from
various parts of the system.
(6) Make sure that the cylinder is situated on the scale before recovery takes place.
(7) Start the refrigerant recovery device and operate it in accordance with the manufacturer's
instructions.
(8) Do not overfill cylinders. (Do not exceed 80% liquid charge volume).
(9) Do not exceed the maximum working pressure of the cylinder, even temporarily.
(10)When the cylinders have been filled correctly and the process is completed, make sure
that the cylinders and the equipment are removed from site promptly and all valves on
the equipment are closed.
(11)Recovered refrigerant shall not be charged into another refrigeration system before it
has been cleaned and checked.
Labelling
Equipment shall be labelled stating that it has been decommissioned and emptied of
refrigerant. The label shall be dated and signed. Ensure that there are labels on the
equipment stating the equipment contains R-32.
Refrigerant recovery
When removing refrigerant from a system, either for servicing or decommissioning, it is
recommended to conduct training so that all refrigerants can be removed safely.
When transferring refrigerant into cylinders, ensure that only appropriate refrigerant recovery
cylinders are used.
Ensure that the correct number of cylinders for holding the total system charge are available.
All cylinders to be used must be designated for the recovered refrigerant and labelled for that
refrigerant (i.e. special cylinders for the recovery of refrigerant). Cylinders shall be equipped
with a pressure relief valve and associated shut-off valves in good working order. If possible,
empty recovery cylinders shall be cooled in a separate place before recovery is conducted.
The recovery equipment shall be in good working order with instructions concerning the
equipment at hand, and shall be suitable for the recovery of R-32. In addition, a set of
calibrated weighing scales shall be available and in good working order. Hoses shall be
equipped with leak-free disconnect couplings and in good condition. Before using the
recovery device, check that it has undergone proper maintenance, that it is in satisfactory
working order, and that any associated electrical components are sealed to prevent ignition
in the event of a refrigerant leakage. Consult manufacturer if in doubt.
The recovered refrigerant shall be returned to the refrigerant supplier in the correct recovery
cylinder, with the relevant Waste Transfer Note attached. Do not mix refrigerants in recovery
units and especially not in cylinders.
If compressors or compressor oil are to be removed, ensure that the refrigerant melted into
the oil has been evacuated to an acceptable level to make certain that R-32 does not remain
within the oil. The evacuation process shall be carried out before returning the compressor
to the supplier. Only electric heating to the compressor body shall be employed to accelerate
this process. Oil drained from the system shall be treated safely.

Safety Cautions SiMX042215E
8Introduction
1.2 Warnings and Cautions Regarding Safety of Users
Warning
Do not store the equipment in a room with fire sources (e.g., naked
flames, gas appliances, electric heaters).
Be sure to use parts listed in the service parts list of the applicable
model and appropriate tools to conduct repair work. Never attempt
to modify the equipment.
The use of inappropriate parts or tools may cause an electrical shock,
excessive heat generation or fire.
If the power cable and lead wires are scratched or have deteriorated,
be sure to replace them.
Damaged cable and wires may cause an electrical shock, excessive heat
generation or fire.
Do not use a joined power cable or extension cable, or share the
same power outlet with other electrical appliances, since it may
cause an electrical shock, excessive heat generation or fire.
Be sure to use an exclusive power circuit for the equipment, and
follow the local technical standards related to the electrical
equipment, the internal wiring regulations, and the instruction
manual for installation when conducting electrical work.
Insufficient power circuit capacity and improper electrical work may cause
an electrical shock or fire.
Be sure to use the specified cable for wiring between the indoor and
outdoor units.
Make the connections securely and route the cable properly so that there
is no force pulling the cable at the connection terminals.
Improper connections may cause excessive heat generation or fire.
When wiring between the indoor and outdoor units, make sure that
the terminal cover does not lift off or dismount because of the cable.
If the cover is not mounted properly, the terminal connection section may
cause an electrical shock, excessive heat generation or fire.
Do not damage or modify the power cable.
Damaged or modified power cables may cause an electrical shock or fire.
Placing heavy items on the power cable, or heating or pulling the power
cable may damage it.
Do not mix air or gas other than the specified refrigerant (R-32 /
R-410A / R-22) in the refrigerant system.
If air enters the refrigerant system, an excessively high pressure results,
causing equipment damage and injury.
If the refrigerant gas leaks, be sure to locate the leaking point and
repair it before charging the refrigerant. After charging the
refrigerant, make sure that there is no leak.
If the leaking point cannot be located and the repair work must be
stopped, be sure to pump-down, and close the service valve, to prevent
refrigerant gas from leaking into the room. Refrigerant gas itself is
harmless, but it may generate toxic gases when it contacts flames, such
as those from fan type and other heaters, stoves and ranges.
When relocating the equipment, make sure that the new installation
site has sufficient strength to withstand the weight of the
equipment.
If the installation site does not have sufficient strength or the installation
work is not conducted securely, the equipment may fall and cause injury.

SiMX042215E Safety Cautions
Introduction 9
Check to make sure that the power cable plug is not dirty or loose,
then insert the plug into a power outlet securely.
If the plug is dusty or has a loose connection, it may cause an electrical
shock or fire.
When replacing the coin battery in the remote controller, be sure to
dispose of the old battery to prevent children from swallowing it.
If a child swallows the coin battery, see a doctor immediately.
Caution
Installation of a leakage breaker is necessary in some cases
depending on the conditions of the installation site, to prevent
electrical shocks.
Do not install the equipment in a place where there is a possibility of
combustible gas leaks.
If combustible gas leaks and remains around the unit, it may cause a fire.
Check to see if parts and wires are mounted and connected
properly, and if connections at the soldered or crimped terminals
are secure.
Improper installation and connections may cause excessive heat
generation, fire or an electrical shock.
If the installation platform or frame has corroded, replace it.
A corroded installation platform or frame may cause the unit to fall,
resulting in injury.
Check the earth / grounding, and repair it if the equipment is not
properly earthed / grounded.
Improper earth / grounding may cause an electrical shock.
Be sure to measure insulation resistance after the repair, and make
sure that the resistance is 1 M or higher.
Faulty insulation may cause an electrical shock.
Be sure to check the drainage of the indoor unit after the repair.
Faulty drainage may cause water to enter the room and wet the furniture
and floor.
Do not tilt the unit when removing it.
The water inside the unit may spill and wet the furniture and floor.
Warning

Icons Used SiMX042215E
10 Introduction
2. Icons Used
The following icons are used to attract the attention of the reader to specific information.
Icon Type of
Information
Description
Warning
Warning Warning is used when there is danger of personal injury.
Caution
Caution Caution is used when there is danger that the reader,
through incorrect manipulation, may damage equipment,
lose data, get an unexpected result or have to restart (part
of) a procedure.
Note
Note Note provides information that is not indispensable, but
may nevertheless be valuable to the reader, such as tips
and tricks.
Reference
Reference Reference guides the reader to other places in this binder
or in this manual, where he/she will find additional
information on a specific topic.

SiMX042215E Revision History
Introduction 11
3. Revision History
Month/Year Version Revised contents
07 / 2022 SiMX042215E First edition

SiMX042215E
12 Part 1 General Information
1. Applicable Models .................................................................................13
2. Functions...............................................................................................14
Part 1
General Information

SiMX042215E Applicable Models
Part 1 General Information 13
1. Applicable Models
Indoor Unit Outdoor Unit
FTKM12UVLWZ
FTKM18UVLVZ
FTKM24UVLUZ
RKMG12UVLWZ
RKMG18UVLVZ
RKMG24UVLUZ

Functions SiMX042215E
14 Part 1 General Information
2. Functions
Category Functions 12/18 class 24 class
Technology Inverter (with inverter power control) 
Operation limit Refer to page 114
PAM control — 
Indoor fan motor DC DC
Outdoor fan motor DC DC
Compressor Swing compressor 
Reluctance DC motor 
Operation
Mode
Cooling mode 
Heating mode — —
Dry mode 
Fan operation 
Powerful mode 
Econo mode 
INTELLIGENT EYE (infrared sensing technology) — —
Indoor unit quiet operation 
Outdoor unit quiet operation (manual) — —
Comfortable
Airflow
Fan speed 5 steps 5 steps
Auto fan speed 
Power-airflow flap — —
Power-airflow dual flaps 
Wide-angle louvers 
Auto-swing (up and down) 
Auto-swing (left and right) 
3-D airflow 
COANDA operation (comfort airflow mode) 
Health and
Cleanliness
Titanium apatite deodorizing filter 
Ag-ion filter 
PM2.5 filter — —
PM2.5 filter for streamer 
Mold proof air filter (pre-filter) 
Wipe-clean flat panel (washable) 
DEW CLEAN operation 
FLASH STREAMER AIR PURIFYING operation (patented) 
SMELL PROOF operation 
Timers 24-hour ON/OFF TIMER — —
Count up-down ON/OFF TIMER — —
12-hour ON TIMER 
GOOD SLEEP OFF TIMER 
Worry Free
(Reliability &
Durability)
Auto-restart after power failure 
Self-diagnosis 
Stabilizer inside 
Copper tube and aluminum heat exchanger 
Anti-corrosion treatment of outdoor heat exchanger 
Indoor/outdoor unit heat exchanger with enhanced anti-corrosion
property (BTA oil) 
Flexibility Chargeless 10 m 10 m
Either side drain (left or right) 
Installation kit 
Remote Control Wireless remote controller with LCD backlight 
Wireless remote controller with luminous button 
Remote controller LCD back light OFF 
Indoor unit ON/OFF switch 
Signal reception indicator 
Wireless LAN connection — —
Child lock 

—
: Available
: Not available
Activated only when the airflow rate is set to automatic in dry or cooling operation.

SiMX042215E
Part 2 Specifications 15
1. Specifications ........................................................................................16
Part 2
Specifications

Specifications SiMX042215E
16 Part 2 Specifications
1. Specifications
Model Indoor Unit FTKM12UVLWZ FTKM18UVLVZ
Outdoor Unit RKMG12UVLWZ RKMG18UVLVZ
Power Supply 1 , 60 Hz, 220 V 1 , 60 Hz, 220 V
Capacity
Rated (Min. ~ Max.)
kW 3.52 (1.09 ~ 4.0) 5.0 (1.75 ~ 5.4)
Btu/h 12,000 (3,720 ~ 13,650) 17,100 (6,000 ~ 18,400)
kcal/h 3,030 (940 ~ 3,440) 4,300 (1,500 ~ 4,640)
Moisture Removal L/h 1.0 1.8
Running Current (Rated) A 4.50 6.77
Power Consumption
Rated (Min. ~ Max.) W 940.00 (196 ~ 1,150) 1,415 (375 ~ 1,650)
Annual Power Consumption (Rated) kWh 523.54 824.08
Power Factor (Rated) % 95.0 98
SEER (Rated) Btu/Wh 22.00 21.00
Piping Connections Liquid mm  6.4  6.4
Gas mm  9.5  12.7
Drain mm  18  18
Heat Insulation Both Liquid and Gas Pipes Both Liquid and Gas Pipes
Max. Interunit Piping Length m 15 20
Max. Interunit Height Difference m 12 16
Chargeless m 10 10
Amount of Additional Charge of Refrigerant g/m 20 20
Indoor Unit FTKM12UVLWZ FTKM18UVLVZ
Front Panel Color White White
Airflow Rate H
m³/min
(cfm)
11.1 (392) 14.9 (526)
M 9.3 (328) 13.2 (466)
L 6.8 (240) 10.5 (371)
SL 5.6 (198) 9.4 (332)
Fan Type Cross Flow Fan Cross Flow Fan
Motor Output W 39 38
Speed Steps 5 Steps, Quiet, Auto 5 Steps, Quiet, Auto
Air Direction Control Right, Left, Horizontal, Downwards Right, Left, Horizontal, Downwards
Air Filter Removable, Washable, Mildew Proof Removable, Washable, Mildew Proof
Running Current (Rated) A 0.21 0.29
Power Consumption (Rated) W 20.2 64
Power Factor (Rated) % 41.6 99.1
Temperature Control Microcomputer Control Microcomputer Control
Dimensions (H × W × D) mm 298 × 800 × 229 298 × 885 × 229
Packaged Dimensions (H × W × D) mm 375 × 895 × 325 390 × 1,010 × 355
Weight (Mass) kg 9.5 10.5
Gross Weight (Gross Mass) kg 12.5 13.5
Sound Pressure Level H / M / L / SL dB(A) 41 / 36 / 29 / 26 45 / 40 / 35 / 33
Outdoor Unit RKMG12UVLWZ RKMG18UVLVZ
Casing Color Ivory White Ivory White
Heat Exchanger Fin / Spec. Tube Waffle Fin (PE) /  7 Hi-XD Tube Waffle Fin (PE) /  7 Hi-XD Tube
Compressor Type Hermetically Sealed Swing Type Hermetically Sealed Swing Type
Model 1YC20HXD 1Y097BKAX1N
Motor Output W 650 920
Refrigerant Oil Type FW50DA FW50DA
Charge L 0.275 0.350
Refrigerant Type R-32 R-32
Charge kg 0.68 0.850
Airflow Rate H m³/min
(cfm)
33.3 (1,176) 46 (1,624)
SL — —
Fan Type Propeller Propeller
Motor Output W 28 68
Running Current (Rated) A 4.29 6.48
Power Consumption (Rated) W 919.8 1,351
Power Factor (Rated) % 98 95
Starting Current A 4.3 6.77
Dimensions (H × W × D) mm 550 × 675 × 284 595 × 845 × 300
Packaged Dimensions (H × W × D) mm 620 × 825 × 400 680 × 1,035 × 410
Weight (Mass) kg 24 31.5
Gross Weight (Gross Mass) kg 30 38.5
Sound Pressure Level H dB(A) 51 54
Conditions Based on Indoor ; 27°CDB / 19°CWB, Outdoor ; 35°CDB, Piping Length: 5 m
Note(s) Airflow rate (m³/min) during fan operation:
H: 11.9, M: 10.0, L: 7.2, SL: 6.0
Airflow rate (m³/min) during fan operation:
H: 16.2, M: 15.0, L: 11.9, SL: 10.6
Drawing No. 3D141454A 3D141456B
Conversion Formulae
kcal/h = kW × 860
Btu/h = kW × 3412
cfm = m³/min × 35.3