DAIKIN FTXM-K FTXM20K3V1B, FTXM25K3V1B, FTXM35K3V1B, FTXM42K3V1B, FTXM50K3V1B inverter pair wall mounted air conditioner Service manual
Below you will find brief product information for FTXM-K FTXM20K3V1B, FTXM-K FTXM25K3V1B, FTXM-K FTXM35K3V1B, FTXM-K FTXM42K3V1B, FTXM-K FTXM50K3V1B. The FTXM-K FTXM20K3V1B, FTXM-K FTXM25K3V1B, FTXM-K FTXM35K3V1B, FTXM-K FTXM42K3V1B, FTXM-K FTXM50K3V1B are inverter pair wall mounted air conditioners. These air conditioners are designed for use in residential or commercial settings, and they offer a variety of features to ensure optimal comfort and energy efficiency. The FTXM-K FTXM20K3V1B, FTXM-K FTXM25K3V1B, FTXM-K FTXM35K3V1B, FTXM-K FTXM42K3V1B, FTXM-K FTXM50K3V1B come with multiple operating modes, including cool, heat, dry, and fan-only mode. They are also equipped with a timer, remote control, and a variety of other features.
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SiBE041434E
Service
Manual
Inverter Pair
Wall Mounted Type FTXM-K Series
[Applied Models]
z Inverter Pair : Heat Pump
i z
Heat Pump
Indoor Unit
FTXM20K3V1B
FTXM25K3V1B
FTXM35K3V1B
FTXM42K3V1B
FTXM50K3V1B
Outdoor Unit
RXM20LV1B
RXM25LV1B
RXM35LV1B
RXM42LV1B
RXM50LV1B
SiBE041434E
Inverter Pair
Wall Mounted Type
FTXM-K Series
Table of Contents
SiBE041434E
Warnings and Cautions Regarding Safety of Workers............................. v
Warnings and Cautions Regarding Safety of Users................................ xi
Part 1 List of Functions ................................................................1
Part 2 Specifications .................................................................... 3
Part 3 Printed Circuit Board Connector Wiring Diagram .............7
Part 4 Function and Control........................................................15
Temperature Control ..............................................................................16
Airflow Direction Control.........................................................................18
Fan Speed Control for Indoor Unit .........................................................20
Program Dry Operation ..........................................................................21
Automatic Operation...............................................................................22
NIGHT SET Mode ..................................................................................24
ECONO Operation .................................................................................24
1.10 INTELLIGENT EYE Operation (20/25 Class).........................................25
1.11 2-Area INTELLIGENT EYE Operation (35/42/50 Class) ........................26
1.12 Inverter POWERFUL Operation .............................................................28
1.14 WEEKLY TIMER Operation ...................................................................30
Controls at Mode Changing / Start-up....................................................40
Discharge Pipe Temperature Control.....................................................42
Freeze-up Protection Control .................................................................44
Heating Peak-cut Control .......................................................................44
Outdoor Fan Control...............................................................................45
Liquid Compression Protection Function................................................45
3.11 Electronic Expansion Valve Control .......................................................47
Table of Contents ii
SiBE041434E
Part 5 Remote Controller ............................................................ 51
Part 6 Service Diagnosis.............................................................56
1. General Problem Symptoms and Check Items .....................................57
2. Troubleshooting with LED .....................................................................58
Error Codes and Description ..................................................................62
Indoor Unit PCB Abnormality .................................................................63
Freeze-up Protection Control / Heating Peak-cut Control ......................64
Fan Motor (DC Motor) or Related Abnormality.......................................65
Thermistor or Related Abnormality (Indoor Unit)....................................68
Low-voltage Detection or Over-voltage Detection..................................71
Signal Transmission Error (Between Indoor Unit and Outdoor Unit)......73
Unspecified Voltage (Between Indoor Unit and Outdoor Unit) ...............75
4.10 Outdoor Unit PCB Abnormality...............................................................76
4.11 OL Activation (Compressor Overload) ...................................................78
4.15 Four Way Valve Abnormality..................................................................83
4.16 Discharge Pipe Temperature Control.....................................................85
4.17 High Pressure Control in Cooling ...........................................................86
4.18 Compressor System Sensor Abnormality ..............................................87
4.20 DC Voltage / Current Sensor Abnormality (20/25/35 Class Only) ..........90
4.21 Thermistor or Related Abnormality (Outdoor Unit) .................................91
4.22 Electrical Box Temperature Rise............................................................93
4.23 Radiation Fin Temperature Rise ............................................................94
4.24 Output Overcurrent Detection ................................................................95
Thermistor Resistance Check ................................................................97
Fan Motor Connector Output Check ......................................................98
Power Supply Waveforms Check...........................................................99
Electronic Expansion Valve Check.........................................................99
Four Way Valve Performance Check ...................................................100
Inverter Unit Refrigerant System Check...............................................100
Inverter Analyzer Check .......................................................................101
Rotation Pulse Check on the Outdoor Unit PCB ..................................102
Installation Condition Check.................................................................103
5.10 Discharge Pressure Check...................................................................104
5.11 Outdoor Fan System Check .................................................................104
iii Table of Contents
SiBE041434E
Part 7 Trial Operation and Field Settings.................................108
1. Pump Down Operation........................................................................109
2. Forced Cooling Operation ...................................................................110
When 2 Units are installed in 1 Room ..................................................112
Model Type Setting ..............................................................................112
Facility Setting (cooling at low outdoor temperature) ...........................113
5. Silicon Grease on Power Transistor / Diode Bridge ............................115
Part 8 Appendix......................................................................... 116
Table of Contents iv
v
Safety Cautions SiBE041434E
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 they can lead to death or serious injury 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 the item for which caution must be exercised.
The pictogram shows the item to which attention must be paid.
This symbol indicates the prohibited action.
The prohibited item or action is shown in the illustration or near the symbol.
This symbol indicates the action that must be taken, or the instruction.
The instruction is shown in the illustration or near the symbol.
1.1
Warnings and Cautions Regarding Safety of Workers
Warning
Do not store the equipment in a room with successive fire sources (e.g., naked flame, gas appliance, electric heater).
Be sure to disconnect the power cable plug from the plug socket before disassembling the equipment for repair.
Working on the 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 inspecting the circuits, do not touch any electrically charged sections of the equipment.
If the refrigerant gas is discharged during the repair work, do not touch the discharged refrigerant gas.
The 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 wellventilated 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 the refrigerant gas leaks during the repair work, ventilate the area.
The 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.
SiBE041434E
Warning
Do not start or stop the air conditioner operation by plugging or unplugging the power cable plug.
Plugging or unplugging the power cable plug 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 at a high place (more than 2 m).
Insufficient safety measures may cause a fall accident.
In case of R-32 / R-410A refrigerant models, be sure to use pipes, flare nuts and tools for the exclusive use of 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 as well as an 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 refrigerating system, an excessively high pressure results, causing equipment damage and injury.
Caution
Do not repair the electrical components with wet hands.
Working on the equipment with wet hands may cause an electrical shock.
Do not clean the air conditioner by splashing water.
Washing the unit with water may cause an electrical shock.
Be sure to provide the 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.
Safety Cautions
vi
Safety Cautions SiBE041434E
Caution
Use the welder in a well-ventilated place.
Using the welder in an enclosed room may cause oxygen deficiency.
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. nonsparking, 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 CO
2
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.
vii
SiBE041434E Safety Cautions
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.
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.
viii
Safety Cautions SiBE041434E
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.
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.
ix
SiBE041434E Safety Cautions
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.
a) Comprehend the equipment and its operation.
b) Isolate the system electrically.
c) 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.
d) Pump down the refrigerant system, if possible.
e) If vacuum can not be ensured, apply a manifold so that refrigerant can be removed from various parts of the system.
f) Make sure that the cylinder is situated on the scale before recovery takes place.
g) Start the refrigerant recovery device and operate it in accordance with the manufacturer's instructions.
h) Do not overfill cylinders. (Do not exceed 80% liquid charge volume).
i) Do not exceed the maximum working pressure of the cylinder, even temporarily.
j) 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.
k) 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.
x
Safety Cautions SiBE041434E
1.2
Warnings and Cautions Regarding Safety of Users
Warning
Do not store the equipment in a room with successive fire sources (e.g., naked flame, gas appliance, electric heater).
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 have scratches or 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 cable may cause an electrical shock or fire.
Placing heavy items on the power cable, and heating or pulling the power cable may damage the cable.
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 refrigerating 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 refrigerant, make sure that there is no refrigerant leak.
If the leaking point cannot be located and the repair work must be stopped, be sure to perform pump-down and close the service valve, to prevent the refrigerant gas from leaking into the room. The refrigerant gas itself is harmless, but it may generate toxic gases when it contacts flames, such as fan and other heaters, stoves and ranges.
xi
SiBE041434E Safety Cautions
Warning
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 and if the installation work is not conducted securely, the equipment may fall and cause injury.
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 has dust or loose connection, it may cause an electrical shock or fire.
Be sure to install the product correctly by using the provided standard installation frame.
Incorrect use of the installation frame and improper installation may cause the equipment to fall, resulting in injury.
For unitary type only
Be sure to install the product securely in the installation frame mounted on the window frame.
If the unit is not securely mounted, it may fall and cause injury.
For unitary type only
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 the combustible gas leaks and remains around the unit, it may cause a fire.
Check to see if the parts and wires are mounted and connected properly, and if the 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.
Corroded installation platform or frame may cause the unit to fall, resulting in injury.
xii
Safety Cautions SiBE041434E
Caution
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 the insulation resistance after the repair, and make sure that the resistance is 1 M
Ω 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 the 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.
Be sure to install the packing and seal on the installation frame properly.
If the packing and seal are not installed properly, water may enter the room and wet the furniture and floor.
For unitary type only xiii
SiBE041434E Used Icons
2. Used Icons
The following icons are used to attract the attention of the reader to specific information.
Icon Type of
Information
Warning
Description
A Warning is used when there is danger of personal injury.
Warning
Caution
Caution
Note
A Caution is used when there is danger that the reader, through incorrect manipulation, may damage equipment, lose data, get an unexpected result or has to restart (part of) a procedure.
A Note provides information that is not indispensable, but may nevertheless be valuable to the reader, such as tips and tricks.
Note:
Reference A 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.
xiv
SiBE041434E
Part 1
List of Functions
1 List of Functions
SiBE041434E
1. Functions
Functions
Category Functions Category Functions
Basic Function Inverter (with inverter power control)
Operation limit for cooling (°CDB)
Compressor
Comfortable
Airflow
Operation limit for heating (°CWB)
PAM control
Standby electricity saving
Oval scroll compressor
Swing compressor
Rotary compressor
Reluctance DC motor
Power-airflow flap
Power-airflow dual flaps
Power-airflow diffuser
Wide-angle louvers
Auto-swing (up and down)
Auto-swing (right and left)
3-D airflow
COMFORT AIRFLOW operation
Auto fan speed Comfort
Control
Indoor unit quiet operation
NIGHT QUIET mode (automatic)
OUTDOOR UNIT QUIET operation
(manual)
Operation
Lifestyle
Convenience
INTELLIGENT EYE operation
2-area INTELLIGENT EYE operation
Quick warming function
(preheating operation)
Hot-start function
Automatic defrosting
Automatic operation
Program dry operation
Fan only
New POWERFUL operation (noninverter)
Inverter POWERFUL operation
Priority-room setting
COOL / HEAT mode lock
HOME LEAVE operation
ECONO operation
Indoor unit ON/OFF button
Signal receiving sign
R/C with back light
Temperature display
Note:
z
: Available
— : Not available
— z
—
—
— z z z z
— z
— z z z z z z
— z z
—
— z z
—
— z z z
–10
~ 46
–15
~ 18 z z
— z z
— z z
— Remote
—
Controller
— z z z z
— z
Health & Clean Air-purifying filter
–10
~ 46
–15
~ 18 z z
Photocatalytic deodorizing filter
Air-purifying filter with photocatalytic deodorizing function (option)
Titanium apatite photocatalytic airpurifying filter
Air filter (prefilter)
— z
— z
— z
Timer
Wipe-clean flat panel
Washable grille
MOLD PROOF operation
Heating dry operation
Good-sleep cooling operation
WEEKLY TIMER operation
24-hour ON/OFF TIMER
NIGHT SET mode
— z z
Worry Free z
(Reliability &
Durability) z z z z
Flexibility
Auto-restart (after power failure)
Self-diagnosis (R/C, LED)
Wiring error check function
Anti-corrosion treatment of outdoor heat exchanger
— z
— z z z z z
Remote z
Control z
Remote control adaptor
(normal open pulse contact) (option)
Remote control adaptor
(normal open contact) (option)
—
—
— z z z
—
—
—
— z z z z z
— z
—
—
— z
—
— z z z z z
— z
Multi-split / split type compatible indoor unit
—
Flexible power supply correspondence —
High ceiling application
Chargeless
Either side drain (right or left)
Power selection
—
—
—
—
10 m 10 m z z
— —
Facility setting (cooling at low outdoor temperature)
5-room centralized controller (option) z z z z z z z z z z
—
—
— z
DIII-NET compatible (adaptor) (option) z
Wireless LAN connection (option)
Wireless
Wired (option) z z z z z z
List of Functions 2
SiBE041434E
Part 2
Specifications
3 Specifications
SiBE041434E Specifications
1. Specifications
Model
Indoor Unit
Outdoor Unit
Capacity
Rated (Min. ~ Max.)
Moisture Removal
Running Current (Rated)
Power Consumption
Rated (Min. ~ Max.)
Power Factor (Rated)
EER (Cooling) / COP (Heating)
Piping
Connections
Liquid
Gas
Drain
Heat Insulation
Max. Interunit Piping Length
Max. Interunit Height Difference
Chargeless
Amount of Additional Charge of
Refrigerant
Indoor Unit
Front Panel Color
Airflow Rate
H
M
L
SL
Fan
Type
Motor Output
Speed
Air Direction Control
Air Filter
Running Current (Rated)
Power Consumption (Rated)
Power Factor (Rated)
Temperature Control
Dimensions (H × W × D)
Packaged Dimensions (H × W × D)
Weight (Mass)
Gross Weight (Gross Mass)
Sound Pressure
Level
H / M / L / SL
Sound Power Level (H)
Outdoor Unit
Casing Color
Compressor
Type
Model
Motor Output
Type
Refrigerant Oil
Charge
Type
Refrigerant
Charge
H
Airflow Rate
SL
Type
Fan
Motor Output
Running Current (Rated)
Power Consumption (Rated)
Power Factor (Rated)
Starting Current
Dimensions (H × W × D)
Packaged Dimensions (H × W × D)
Weight (Mass)
Gross Weight (Gross Mass)
Sound Pressure
Level
H / SL
Sound Power Level (H)
Drawing No.
kW
Btu/h kcal/h
L/h
A
W
%
W/W mm mm mm m m m g/m m³/min
(cfm)
W
Steps
A
W
% mm mm kg kg dB(A) dB
W
L kg m³/min
(cfm)
A mm mm kg kg
W
A
W
% dB(A) dB
1.1
2.46 - 2.36 - 2.26
FTXM20K3V1B
RXM20LV1B
Cooling
2.0 (1.3 ~ 2.8)
6,800 (4,400 ~ 9,600)
—
Heating
2.5 (1.3 ~ 4.3)
8,500 (4,400 ~ 14,700)
—
—
2.80 - 2.70 - 2.60
441 (320 ~ 760) 550 (310 ~ 1,120)
81.4 - 81.3 - 81.4
89.3 - 88.6 - 88.1
4.53
φ 6.4
φ 9.5
φ 18.0
Both Liquid and Gas Pipes
4.55
20
15
10
20
FTXM20K3V1B
White
8.8 (311)
6.7 (237)
4.7 (166)
3.9 (138)
9.5 (335)
7.8 (275)
6.0 (212)
4.3 (152)
Cross Flow Fan
16
5 Steps, Quiet, Auto
Right, Left, Horizontal, Downward
Removable, Washable, Mildew Proof
0.19 - 0.18 - 0.17
0.19 - 0.18 - 0.17
40
95.7 - 96.6 - 98.0
40
95.7 - 96.6 - 98.0
Microcomputer Control
289 × 780 × 215
274 × 850 × 346
8
12
40 / 32 / 24 / 19 40 / 34 / 27 / 19
58 58
RXM20LV1B
Ivory White
Hermetically Sealed Swing Type
1YC25FXD
800
FW68DA
0.375
R-32
0.72
33.5 (1,183)
29.3 (1,035)
29.0 (1,024)
25.6 (904)
Propeller
23
2.27 - 2.18 - 2.09
401
80.2 - 80.0 - 80.0
3.7
550 × 765 × 285
589 × 882 × 363
34
38
2.61 - 2.52 - 2.43
510
88.8 - 88.0 - 87.4
46 / 43 47 / 44
59 60
3D092694B
Note:
The data are based on the conditions shown in the table below.
Cooling
Indoor ; 27°CDB / 19°CWB
Outdoor ; 35°CDB / 24°CWB
Heating
Indoor ; 20°CDB
Outdoor ; 7°CDB / 6°CWB
Piping Length
5 m
50 Hz, 220 - 230 - 240 V
FTXM25K3V1B
RXM25LV1B
Cooling
2.5 (1.3 ~ 3.2)
8,500 (4,400 ~ 10,900)
—
1.2
3.23 - 3.13 - 3.03
Heating
2.8 (1.3 ~ 4.7)
9,600 (4,400 ~ 16,000)
—
—
3.30 - 3.20 - 3.10
576 (320 ~ 1,000) 620 (310 ~ 1,410)
81.0 - 79.9 - 79.2
85.4 - 84.2 - 83.3
4.34
φ 6.4
φ 9.5
φ 18.0
Both Liquid and Gas Pipes
4.52
20
15
10
20
FTXM25K3V1B
White
9.1 (321)
7.0 (247)
5.0 (177)
3.9 (138)
10.0 (353)
8.0 (282)
6.0 (212)
4.3 (152)
Cross Flow Fan
16
5 Steps, Quiet, Auto
Right, Left, Horizontal, Downward
Removable, Washable, Mildew Proof
0.19 - 0.18 - 0.17
0.19 - 0.18 - 0.17
40
95.7 - 96.6 - 98.0
40
95.7 - 96.6 - 98.0
Microcomputer Control
289 × 780 × 215
274 × 850 × 346
8
12
41 / 33 / 25 / 19 41 / 34 / 27 / 19
58 58
RXM25LV1B
Ivory White
Hermetically Sealed Swing Type
1YC25FXD
800
FW68DA
0.375
R-32
0.72
33.5 (1,183)
29.3 (1,035)
29.0 (1,024)
25.6 (904)
Propeller
23
3.04 - 2.95 - 2.86
536
80.1 - 78.9 - 78.1
3.7
550 × 765 × 285
589 × 882 × 363
34
38
3.11 - 3.02 - 2.93
580
84.8 - 83.5 - 82.5
46 / 43 47 / 44
59 60
3D092692A
Conversion Formulae kcal/h = kW × 860
Btu/h = kW × 3412 cfm = m³/min × 35.3
Specifications 4
Specifications SiBE041434E
Model
Indoor Unit
Outdoor Unit
Capacity
Rated (Min. ~ Max.)
Moisture Removal
Running Current (Rated)
Power Consumption
Rated (Min. ~ Max.)
Power Factor (Rated)
EER (Cooling) / COP (Heating)
Piping
Connections
Liquid
Gas
Drain
Heat Insulation
Max. Interunit Piping Length
Max. Interunit Height Difference
Chargeless
Amount of Additional Charge of
Refrigerant
Indoor Unit
Front Panel Color
Airflow Rate
H
M
L
SL
Fan
Type
Motor Output
Speed
Air Direction Control
Air Filter
Running Current (Rated)
Power Consumption (Rated)
Power Factor (Rated)
Temperature Control
Dimensions (H × W × D)
Packaged Dimensions (H × W × D)
Weight (Mass)
Gross Weight (Gross Mass)
Sound Pressure
Level
H / M / L / SL
Sound Power Level (H)
Outdoor Unit
Casing Color
Compressor
Type
Model
Motor Output
Type
Refrigerant Oil
Charge
Type
Refrigerant
Charge
H
Airflow Rate
SL
Type
Fan
Motor Output
Running Current (Rated)
Power Consumption (Rated)
Power Factor (Rated)
Starting Current
Dimensions (H × W × D)
Packaged Dimensions (H × W × D)
Weight (Mass)
Gross Weight (Gross Mass)
Sound Pressure
Level
H / SL
Sound Power Level (H)
Drawing No.
A
W
% mm mm kg kg dB(A) dB kW
Btu/h kcal/h
L/h
A
W
%
W/W mm mm mm m m m g/m
W
L
A mm mm kg kg
W
A
W
% dB(A) dB m³/min
(cfm)
W
Steps kg m³/min
(cfm)
1.9
4.38 - 4.17 - 3.97
FTXM35K3V1B
RXM35LV1B
Cooling
3.5 (1.4 ~ 4.0)
11,900 (4,800 ~ 13,600)
3,010 (1,200 ~ 3,440)
Heating
4.0 (1.4 ~ 5.2)
13,600 (4,800 ~ 17,700)
3,440 (1,200 ~ 4,470)
—
4.30 - 4.10 - 3.90
855 (350~ 1,190) 840 (340 ~ 1,460)
88.8 - 89.1 - 89.7
88.8 - 89.1 - 89.7
4.09
φ 6.4
φ 9.5
φ 18.0
Both Liquid and Gas Pipes
4.76
20
15
10
20
FTXM35K3V1B
White
11.2 (395)
8.5 (300)
5.8 (205)
4.1 (145)
12.1 (427)
9.3 (328)
6.5 (230)
4.2 (148)
Cross Flow Fan
23
5 Steps, Quiet, Auto
Right, Left, Horizontal, Downward
Removable, Washable, Mildew Proof
0.12 - 0.12 - 0.11
0.13 - 0.13 - 0.12
26 - 26 - 26
98.5 - 94.2 - 98.5
28 - 28 - 28
97.9 - 93.6 - 97.2
Microcomputer Control
298 × 900 × 215
290 × 977 × 371
11
15
45 / 37 / 29 / 19 45 / 39 / 29 / 19
59 59
RXM35LV1B
Ivory White
Hermetically Sealed Swing Type
1YC25FXD
800
FW68DA
0.375
R-32
0.8
36.0 (1,271)
29.3 (1,035)
28.6 (1,010)
25.6 (904)
Propeller
23
4.26 - 4.05 - 3.86
829
88.5 - 88.9 - 89.4
4.4
550 × 765 × 285
589 × 882 × 363
34
38
4.17 - 3.97 - 3.78
812
88.5 - 88.9 - 89.5
49 / 44 49 / 45
61 61
3D092691A
Note:
The data are based on the conditions shown in the table below.
Cooling Heating
Indoor ; 27°CDB / 19°CWB
Outdoor ; 35°CDB / 24°CWB
Indoor ; 20°CDB
Outdoor ; 7°CDB / 6°CWB
Piping Length
5 m
50 Hz, 220 - 230 - 240 V
FTXM42K3V1B
RXM42LV1B
Cooling
4.2 (1.7 ~ 5.0)
14,300 (5,800 ~ 17,100)
3,610 (1,460 ~ 4,300)
2.3
6.17 - 5.86 - 5.65
Heating
5.4 (1.7 ~ 6.0)
18,400 (5,800 ~ 20,500)
4,640 (1,460 ~ 5,160)
—
6.60 - 6.30 - 6.00
1,213 (320 ~ 2,330) 1,310 (400 ~ 1,980)
89.4 - 90.0 - 89.4
90.2 - 90.4 - 91.0
3.46
φ 6.4
φ 12.7
φ 18.0
Both Liquid and Gas Pipes
4.12
30
20
10
20
FTXM42K3V1B
White
11.2 (395)
9.1 (321)
7.0 (247)
4.1 (145)
12.4 (438)
10.0 (353)
7.8 (275)
5.2 (184)
Cross Flow Fan
23
5 Steps, Quiet, Auto
Right, Left, Horizontal, Downward
Removable, Washable, Mildew Proof
0.11 - 0.11 - 0.11
0.14 - 0.14 - 0.13
24 - 24 - 24
99.2 - 94.9 - 90.9
30 - 30 - 30
97.4 - 93.2 - 96.2
Microcomputer Control
298 × 900 × 215
290 × 977 × 371
11
15
45 / 39 / 33 / 21 45 / 39 / 33 / 22
59 59
RXM42LV1B
Ivory White
Hermetically Sealed Swing Type
2YC40GXD
1,300
FW68DA
0.650
R-32
1.50
48.5 (1,713)
38.5 (1,359)
40.4 (1,427)
34.3 (1,211)
Propeller
68
6.06 - 5.75 - 5.54
1,189
89.2 - 89.9 - 89.4
6.6
735 × 825 × 300
792 × 960 × 390
44
48
6.46 - 6.16 - 5.87
1,280
90.0 - 90.3 - 90.9
48 / 44 48 / 45
62 62
3D092693A
Conversion Formulae kcal/h = kW × 860
Btu/h = kW × 3412 cfm = m³/min × 35.3
5 Specifications
SiBE041434E Specifications
Model
Indoor Unit
Outdoor Unit
Capacity
Rated (Min. ~ Max.)
Moisture Removal
Running Current (Rated)
Power Consumption
Rated (Min. ~ Max.)
Power Factor (Rated)
EER (Cooling) / COP (Heating)
Piping
Connections
Liquid
Gas
Drain
Heat Insulation
Max. Interunit Piping Length
Max. Interunit Height Difference
Chargeless
Amount of Additional Charge of
Refrigerant
Indoor Unit
Front Panel Color
Airflow Rate
H
M
L
SL
Fan
Type
Motor Output
Speed
Air Direction Control
Air Filter
Running Current (Rated)
Power Consumption (Rated)
Power Factor (Rated)
Temperature Control
Dimensions (H × W × D)
Packaged Dimensions (H × W × D)
Weight (Mass)
Gross Weight (Gross Mass)
Sound Pressure
Level
H / M / L / SL
Sound Power Level (H)
Outdoor Unit
Casing Color
Compressor
Type
Model
Motor Output
Type
Refrigerant Oil
Charge
Type
Refrigerant
Charge
H
Airflow Rate
SL
Type
Fan
Motor Output
Running Current (Rated)
Power Consumption (Rated)
Power Factor (Rated)
Starting Current
Dimensions (H × W × D)
Packaged Dimensions (H × W × D)
Weight (Mass)
Gross Weight (Gross Mass)
Sound Pressure
Level
H / SL
Sound Power Level (H)
Drawing No.
W
L kg m³/min
(cfm)
A mm mm kg kg
W
A
W
% dB(A) dB kW
Btu/h kcal/h
L/h
A
W
%
W/W mm mm mm m m m g/m m³/min
(cfm)
W
Steps
A
W
% mm mm kg kg dB(A) dB
Note:
The data are based on the conditions shown in the table below.
Cooling Heating
Indoor ; 27°CDB / 19°CWB
Outdoor ; 35°CDB / 24°CWB
Indoor ; 20°CDB
Outdoor ; 7°CDB / 6°CWB
50 Hz, 220 - 230 - 240 V
FTXM50K3V1B
RXM50LV1B
Cooling
5.02 (1.70 ~ 5.30)
17,100 (5,800 ~ 18,100)
4,300 (1,460 ~ 4,560)
2.8
6.91 - 6.60 - 6.28
1,476 (350 ~ 1,810)
97.1 - 97.3 - 97.9
3.40
φ 6.4
φ 12.7
φ 18.0
Both Liquid and Gas Pipes
30
20
10
20
FTXM50K3V1B
White
11.9 (420)
9.6 (339)
7.4 (261)
4.5 (159)
0.12 - 0.12 - 0.11
26 - 26 - 26
98.5 - 94.2 - 98.5
Cross Flow Fan
23
5 Steps, Quiet, Auto
Right, Left, Horizontal, Downward
Removable, Washable, Mildew Proof
Microcomputer Control
298 × 900 × 215
290 × 977 × 371
11
15
Heating
5.80 (1.70 ~ 6.50)
19,800 (5,800 ~ 22,200)
4,990 (1,460 ~ 5,590)
—
6.80 - 6.50 - 6.20
1,450 (300 ~ 2,000)
96.9 - 97.0 - 97.4
4.00
13.3 (470)
10.8 (381)
8.4 (297)
5.5 (194)
0.15 - 0.14 - 0.14
32 - 32 - 32
97.0 - 99.4 - 95.2
46 / 40 / 34 / 23
60
47 / 40 / 34 / 24
60
RXM50LV1B
Ivory White
Hermetically Sealed Swing Type
2YC40GXD
1,300
FW68DA
0.65
R-32
1.50
50.4 (1,780)
38.5 (1,359)
40.4 (1,427)
34.3 (1,211)
Propeller
68
6.79 - 6.48 - 6.17
1,450
97.1 - 97.4 - 97.9
6.65 - 6.36 - 6.06
1,418
96.9 - 96.9 - 97.4
6.6
735 × 825 × 300
792 × 960 × 390
44
48
48 / 44
62
48 / 45
62
3D092682A
Piping Length
5 m
Conversion Formulae kcal/h = kW × 860
Btu/h = kW × 3412 cfm = m³/min × 35.3
Specifications 6
SiBE041434E
Part 3
Printed Circuit Board
Connector Wiring Diagram
7 Printed Circuit Board Connector Wiring Diagram
SiBE041434E
1. Indoor Unit
1.1
20/25 Class
Control PCB
(PCB1)
1) S6
2) S25
3) S26
4) S32
5) S200
6) S403
7) FG1, FG2
8) H1, H2, H3
9) V1
10)JA
11)JB
12)JC
13)LED A
14)FU1 (F1U)
Connector for swing motor (horizontal blade)
Connector for INTELLIGENT EYE sensor PCB
Connector for display PCB
Connector for indoor heat exchanger thermistor
Connector for DC fan motor
Connector for adaptor PCB (option)
Connector for terminal board (frame ground)
Connector for terminal board (indoor - outdoor transmission)
Varistor
Address setting jumper
∗ Refer to page 112 for detail.
Fan speed setting when compressor stops for thermostat OFF
∗ Refer to page 114 for detail.
Power failure recovery function (auto-restart)
∗ Refer to page 114 for detail.
LED for service monitor (green)
Fuse (3.15 A, 250 V)
S32
S26
S6
JA JC JB
Indoor Unit
LED A
S200
S25
S403
FU1
H1
V1
H3
H2
FG1, FG2
2P297453-2
Caution Replace the PCB if you accidentally cut the jumpers other than JA, JB, and JC.
Jumpers are necessary for electronic circuit. Improper operation may occur if you cut any of them.
Note:
The symbols in the parenthesis are the names on the appropriate wiring diagram.
Printed Circuit Board Connector Wiring Diagram 8
Indoor Unit
Display PCB
(PCB2)
1) S27 Connector for control PCB
2) SW1 (S1W) Forced cooling operation ON/OFF button
∗ Refer to page 110 for detail.
3) LED1 (H1P) LED for operation (green)
4) LED2 (H2P) LED for timer (yellow)
5) LED3 (H3P) LED for INTELLIGENT EYE (green)
6) RTH1 (R1T) Room temperature thermistor
S27
(Solder side)
SW1 LED3 LED2 LED1
RTH1
3P185701-3
INTELLIGENT
EYE Sensor PCB
(PCB3)
1) S36 Connector for control PCB
S36
3P296737-1
Note:
The symbols in the parenthesis are the names on the appropriate wiring diagram.
SiBE041434E
9 Printed Circuit Board Connector Wiring Diagram
SiBE041434E Indoor Unit
1.2
35/42/50 Class
Control PCB
(PCB1)
1) S1
2) S21
3) S25
4) S32
5) S41
6) S46
7) S47
8) H1, H2, H3,
FG
9) JA
10) JB
11) JC
12) LED A
13) FU1 (F1U),
FU2
14) V1
Connector for DC fan motor
Connector for centralized control (HA)
Connector for INTELLIGENT EYE sensor PCB
Indoor heat exchanger thermistor
Connector for swing motors
Connector for display PCB
Connector for signal receiver PCB
Connector for terminal board
Address setting jumper
∗ Refer to page 112 for detail.
Fan speed setting when compressor stops for thermostat OFF
∗ Refer to page 114 for detail.
Power failure recovery function (auto-restart)
∗ Refer to page 114 for detail.
LED for service monitor (green)
Fuse (3.15 A, 250 V)
Varistor
S41 S1
S32
LED A
H3
FG
H2
FU1
H1
FU2
S46
S25 V1
S47
JC JA JB
S21
2P206687-8
Caution Replace the PCB if you accidentally cut the jumpers other than JA, JB, and JC.
Jumpers are necessary for electronic circuit. Improper operation may occur if you cut any of them.
Note:
The symbols in the parenthesis are the names on the appropriate wiring diagram.
Printed Circuit Board Connector Wiring Diagram 10
Indoor Unit
Signal Receiver
PCB (PCB2)
1) S48 Connector for control PCB
Display PCB
(PCB3)
S48
3P210728-1
1) S49
2) SW1 (S1W)
Connector for control PCB
Forced cooling operation ON/OFF button
∗ Refer to page 110 for detail.
LED for operation (green) 3) LED1 (H1P)
4) LED2 (H2P)
5) LED3 (H3P)
LED for timer (yellow)
LED for INTELLIGENT EYE (green)
6) RTH1 (R1T) Room temperature thermistor
RTH1 SW1
LED3 LED2 LED1
INTELLIGENT
EYE Sensor PCB
(PCB4)
1) S26
S49
Connector for control PCB
3P210728-1
S26
3EB86013-1
Note:
The symbols in the parenthesis are the names on the appropriate wiring diagram.
SiBE041434E
11 Printed Circuit Board Connector Wiring Diagram
SiBE041434E
2. Outdoor Unit
2.1
20/25/35 Class
Main PCB (PCB2)
1) S10
2) S20
3) S40
4) S70
5) S80
6) S90
7) S100
8) HL3, HN3
9) HR2
10) U, V, W
11) FU2
12) LED A
13) V1
14) J4
15) J5
Outdoor Unit
Connector for filter PCB
Connector for electronic expansion valve coil
Connector for overload protector
Connector for DC fan motor
Connector for four way valve coil
Connector for thermistors
(outdoor temperature, outdoor heat exchanger, discharge pipe)
Connector for forced operation button PCB
Connector for filter PCB
Connector for reactor
Connector for compressor
Fuse (3.15 A, 250 V)
LED for service monitor (green)
Varistor
Jumper for facility setting
∗ Refer to page 113 for detail.
Jumper for improvement of defrost performance
∗ Refer to page 114 for detail.
U V W
S10 J5 J4 S90 LED A
S70
S40
S20
S80
HL3
V1
HN3
HR2
FU2 S100
2P358715-5
Caution Replace the PCB if you accidentally cut a wrong jumper.
Jumpers are necessary for electronic circuit. Improper operation may occur if you cut any of them.
Printed Circuit Board Connector Wiring Diagram 12
Outdoor Unit
Filter PCB (PCB1)
1) S11 Connector for main PCB
2) AC1, AC2, S Connector for terminal board
3) E1, E2
4) HL2, HN2
Terminal for earth wire
Connector for main PCB
5) HR1
6) FU1
7) FU3
8) V2, V3
Connector for reactor
Fuse (3.15 A, 250 V)
Fuse (20 A, 250 V)
Varistor
HR1
HN2
V2 V3
S11
E1, E2
FU3
S
SiBE041434E
AC2
AC1
HL2
FU1
Forced Operation
Button PCB
(PCB3)
1) S110 Connector for main PCB
S110
3P254234-7
3P255755-2
The switch SW1 has no function.
13 Printed Circuit Board Connector Wiring Diagram
V3
V2
FU1
V1
SiBE041434E
2.2
42/50 Class
Main PCB (PCB1)
1) S20
2) S40
3) S70
4) S80
5) S90
6) HL1, HN1, S
7) E1, E2
8) U, V, W
9) FU1, FU2
10) FU3
11) LED A
12) V1, V2, V3
13) J6
14) J8
E1, E2
FU3
Outdoor Unit
Connector for electronic expansion valve coil
Connector for overload protector
Connector for DC fan motor
Connector for four way valve coil
Connector for thermistors
(outdoor temperature, outdoor heat exchanger, discharge pipe)
Connector for terminal board
Terminal for earth wire
Connector for compressor
Fuse (3.15 A, 250 V)
Fuse (30 A, 250 V)
LED for service monitor (green)
Varistor
Jumper for facility setting
∗ Refer to page 113 for detail.
Jumper for improvement of defrost performance
∗ Refer to page 114 for detail.
HL1, HN1, S
S80 S20 S40 S90 J8 J6
LED A
U, V, W
FU2
S70
2P356484-10
Caution Replace the PCB if you accidentally cut a wrong jumper.
Jumpers are necessary for electronic circuit. Improper operation may occur if you cut any of them.
Printed Circuit Board Connector Wiring Diagram 14
15
SiBE041434E
Part 4
Function and Control
Temperature Control ..............................................................................16
Airflow Direction Control.........................................................................18
Fan Speed Control for Indoor Unit .........................................................20
Program Dry Operation ..........................................................................21
Automatic Operation...............................................................................22
NIGHT SET Mode ..................................................................................24
ECONO Operation .................................................................................24
1.10 INTELLIGENT EYE Operation (20/25 Class).........................................25
1.11 2-Area INTELLIGENT EYE Operation (35/42/50 Class) ........................26
1.12 Inverter POWERFUL Operation .............................................................28
1.14 WEEKLY TIMER Operation ...................................................................30
Controls at Mode Changing / Start-up....................................................40
Discharge Pipe Temperature Control.....................................................42
Freeze-up Protection Control .................................................................44
Heating Peak-cut Control .......................................................................44
Outdoor Fan Control...............................................................................45
Liquid Compression Protection Function................................................45
3.11 Electronic Expansion Valve Control .......................................................47
Function and Control
SiBE041434E Main Functions
1. Main Functions
1.1
Temperature Control
Definitions of
Temperatures
The definitions of temperatures are classified as following.
Room temperature: temperature of lower part of the room
Set temperature: temperature set by remote controller
Room thermistor temperature: temperature detected by room temperature thermistor
Target temperature: temperature determined by microcomputer
Target temperature
Room thermistor temperature
Set temperature
Room temperature
(R12321)
Temperature
Control
The temperature of the room is detected by the room temperature thermistor. However, there is a difference between the temperature detected by room temperature thermistor and the temperature of lower part of the room, depending on the type of the indoor unit or installation condition. Practically, the temperature control is done by the target temperature appropriately adjusted for the indoor unit and the temperature detected by room temperature thermistor.
1.2
Frequency Principle
Control
Parameters
The frequency of the compressor is controlled by the following 2 parameters:
The load condition of the operating indoor unit
The difference between the room thermistor temperature and the target temperature
The target frequency is adapted by additional parameters in the following cases:
Frequency restrictions
Initial settings
Forced cooling operation
Inverter Principle
To regulate the capacity, a frequency control is needed. The inverter makes it possible to control the rotation speed of the compressor. The following table explains the inverter principle:
Phase Description
1
2
The supplied AC power source is converted into the DC power source for the present.
The DC power source is reconverted into the three phase AC power source with variable frequency.
When the frequency increases, the rotation speed of the compressor increases resulting in an increase of refrigerant circulation. This leads to a larger amount of heat exchange per unit.
When the frequency decreases, the rotation speed of the compressor decreases resulting in a decrease of refrigerant circulation. This leads to a smaller amount of heat exchange per unit.
Function and Control 16
Main Functions SiBE041434E
The following drawing shows a schematic view of the inverter principle:
Refrigerant circulation rate (high)
Amount of heat exchanged air (large)
Amount of heat exchanged air (small) high speed
DC po high f low f freq= constant
50 Hz
60 Hz freq=variable low speed capacity= variable
Amount of heat exchanged air (large)
Amount of heat exchanged air (small)
Refrigerant circulation rate (low)
(R2812)
Inverter Features
The inverter provides the following features:
The regulating capacity can be changed according to the changes in the outdoor
temperature and cooling / heating load.
Quick heating and quick cooling
The rotation speed of the compressor is increased when starting the heating (or cooling).
This enables to reach the set temperature quickly.
Even during extreme cold weather, high capacity is achieved. It is maintained even when the outdoor temperature is 2°C.
Comfortable air conditioning
A fine adjustment is integrated to keep the room temperature constant.
Energy saving heating and cooling
Once the set temperature is reached, the energy saving operation enables to maintain the room temperature at low power.
Frequency Limits
The following functions regulate the minimum and maximum frequency:
Low
High
Frequency Functions
Four way valve operation compensation. Refer to page 41.
Compressor protection function. Refer to page 41.
Discharge pipe temperature control. Refer to page 42.
Input current control. Refer to page 43.
Freeze-up protection control. Refer to page 44.
Heating peak-cut control. Refer to page 44.
Defrost control. Refer to page 46.
Forced Cooling
Operation
17 Function and Control
SiBE041434E Main Functions
1.3
Airflow Direction Control
Power-Airflow
(Dual) Flap(s)
The large flap sends a large volume of air downward to the floor and provides an optimum control in cooling, dry, and heating operation.
<Cooling / Dry>
During cooling or dry operation, the flap retracts into the indoor unit. Then, cool air can be blown far and distributed all over the room.
<Heating>
During heating operation, the large flap directs airflow downward to spread the warm air to the entire room.
Wide-Angle
Louvers
Auto-Swing
The louvers, made of elastic synthetic resin, provide a wide range of airflow that guarantees comfortable air distribution.
The following table explains the auto-swing process for cooling, dry, heating, and fan:
Cooling / Dry
Flap (up and down)
Fan Heating
Louver
(right and left)
20/25 class
5˚
45˚
(R11256)
15˚
45˚
(R11257)
35/42/50 class
10˚
10˚
60˚
60˚
(R21332)
10˚
10˚
60˚
(R18422)
10˚
30˚
60˚
65˚
(R18423)
–
45˚
45˚
(R11404)
Function and Control 18
Main Functions
3-D Airflow
COMFORT
AIRFLOW
Operation
SiBE041434E
35/42/50 class only
Alternative repetition of vertical and horizontal swing motions enables uniform air-conditioning of the entire room.
When the horizontal swing and vertical swing are both set to automatic operation, the airflow becomes 3-D airflow. The horizontal and vertical swing motions are alternated and the airflow direction changes in the order shown in the following diagram.
(1) The louvers move from the right to the left.
(2) The flaps move downward.
(3) The louvers move from the left to the right.
(4) The flaps move upward.
(1)
(2)
(4)
(3)
(R19554)
The flap is controlled not to blow the air directly at the people in the room.
Cooling / Dry Heating
20/25 class
0˚
50˚
(R11259) (R11258)
35/42/50 class 5˚
70˚
(R21333) (R21334)
19 Function and Control
SiBE041434E Main Functions
1.4
Fan Speed Control for Indoor Unit
Outline
Phase control and fan speed control contains 9 steps: LLL, LL, SL, L, ML, M, MH, H, and HH.
The airflow rate can be automatically controlled depending on the difference between the room thermistor temperature and the target temperature.
Automatic Fan
Speed Control
In automatic fan speed operation, the step SL is not available.
Step Cooling Heating
LLL
LL
L
ML
M
MH
H
HH (POWERFUL) (R11681) (R6834)
= The airflow rate is automatically controlled within this range when the FAN setting button is set to automatic.
<Cooling>
The following drawing explains the principle of fan speed control for cooling.
Fan speed
+2.5°C
+1.5°C
+0.5°C
Room thermistor temperature – target temperature
MH*
+3°C
M
+2°C
ML
+1°C
L
COMFORT
AIRFLOW
Operation
(R14588)
*The upper limit is M tap for 30 minutes from the operation start.
<Heating>
In heating operation, the fan speed is regulated according to the indoor heat exchanger temperature and the difference between the room thermistor temperature and the target temperature.
The fan speed is controlled automatically.
The latest command has the priority between POWERFUL and COMFORT AIRFLOW.
Function and Control 20
Main Functions SiBE041434E
1.5
Program Dry Operation
Outline
Program dry operation removes humidity while preventing the room temperature from lowering.
Since the microcomputer controls both the temperature and airflow rate, the temperature adjustment and FAN setting buttons are inoperable.
Detail
The microcomputer automatically sets the temperature and airflow rate. The difference between the room thermistor temperature at start-up and the target temperature is divided into two zones. Then, the unit operates in an appropriate capacity for each zone to maintain the temperature and humidity at a comfortable level.
Room thermistor temperature at start-up
Target temperature
X
Thermostat OFF point
Y
24ºC or more X
–
2.5ºC
Thermostat ON point
Z
X
–
0.5ºC or
Y + 0.5ºC (zone B) continues for 10 min.
23.5ºC
Room thermistor temperature at start-up
18ºC
17.5ºC
18ºC
X
X
–
2.0ºC
–
2.0ºC
X
–
0.5ºC or
Y + 0.5ºC (zone B) continues for 10 min.
X
–
0.5ºC = 17.5ºC or
Y + 0.5ºC (zone B) continues for 10 min.
Zone C = Thermostat ON
X
Z
Zone B
Y
Zone A = Thermostat OFF
Zone B
+0.5ºC
(R11581)
21 Function and Control
SiBE041434E Main Functions
1.6
Automatic Operation
Outline Automatic Cooling / Heating Function
When the automatic operation is selected with the remote controller, the microcomputer automatically determines the operation mode as cooling or heating according to the room temperature and the set temperature at start-up.
The unit automatically switches the operation mode to maintain the room temperature at the set temperature.
Detail
Ts: set temperature (set by remote controller)
Tt: target temperature (determined by microcomputer)
Tr: room thermistor temperature (detected by room temperature thermistor)
C: correction value
1. The set temperature (Ts) determines the target temperature (Tt).
(Ts = 18 ~ 30°C).
2. The target temperature (Tt) is calculated as;
Tt = Ts + C where C is the correction value
.
C = 0°C
3. Thermostat ON/OFF point and operation mode switching point are as follows.
Tr means the room thermistor temperature.
(1) Heating
→ Cooling switching point:
Tr
≥ Tt + 2.5°C (20/25 class)
Tr
≥ Tt + 3.0°C (35/42/50 class)
(2) Cooling
→ Heating switching point:
Tr < Tt – 2.5°C
(3) Thermostat ON/OFF point is the same as the ON/OFF point of cooling or heating operation.
4. During initial operation
Tr
≥ Ts : Cooling operation
Tr < Ts : Heating operation
20/25 class
Cooling Operation
Target temperature – 2.0˚C
= Thermostat OFF
Target temperature – 2.5˚C
Target temperature + 2.5˚C
Target temperature + 1.5˚C
= Thermostat OFF
Heating Operation
(R11893)
Ex: When the target temperature is 25°C
Cooling
→ 23°C: Thermostat OFF → 22°C: Switch to heating
Heating
→ 26.5°C: Thermostat OFF → 27.5°C: Switch to cooling
35/42/50 class
Target temperature – 2.0˚C
= Thermostat OFF
Target temperature – 2.5˚C
Cooling Operation
Target temperature + 3.0˚C
Target temperature + 2.0˚C
= Thermostat OFF
Heating Operation
(R11892)
Ex: When the target temperature is 25°C
Cooling
→ 23°C: Thermostat OFF → 22°C: Switch to heating
Heating
→ 27°C: Thermostat OFF → 28°C: Switch to cooling
Function and Control 22
Main Functions SiBE041434E
1.7
Thermostat Control
Outline
Thermostat control is based on the difference between the room thermistor temperature and the target temperature.
Detail Thermostat OFF Condition
The temperature difference is in the zone A.
Thermostat ON Conditions
The temperature difference returns to the zone C after being in the zone A.
The system resumes from defrost control in any zones except A.
The operation turns on in any zones except A.
The monitoring time has passed while the temperature difference is in the zone B.
(Cooling / Dry: 10 minutes, Heating: 10 seconds)
<Cooling / Dry>
ON
Room thermistor temperature – target temperature
Cooling : –0.5˚C
Dry : –0.5˚C
C
–1.5˚C
B
A
Cooling : –2.0˚C
Dry : –2.5 ~ –2.0˚C
OFF
(R12319)
<Heating>
20/25 class
Room thermistor temperature – target temperature
OFF
A
1.0˚C
B
C
1.5˚C
0˚C
ON
(R12320)
35/42/50 class
A
B
1.5˚C
C
OFF
Room thermistor temperature – target temperature
2.0˚C
0.5˚C
ON
Refer to Temperature Control on page 16 for detail.
(R11894)
23 Function and Control
SiBE041434E Main Functions
1.8
NIGHT SET Mode
Outline
When the OFF TIMER is set, NIGHT SET Mode is automatically activated. NIGHT SET Mode keeps the airflow rate setting.
Detail
NIGHT SET Mode continues operation at the target temperature for the first one hour, then automatically raises the target temperature slightly in the case of cooling, or lowers it slightly in the case of heating. This prevents excessive cooling in summer and excessive heating in winter to ensure comfortable sleeping conditions, and also conserves electricity.
<Cooling>
0.5˚C
Target temperature
1 hour
TIMER operation
NIGHT SET Mode ON
+0.5˚C temperature shift
Operation stops at the set hours
(R18917)
<Heating>
Target temperature
2˚C
1 hour
TIMER operation
NIGHT SET Mode ON
–2˚C temperature shift
1.9
ECONO Operation
Outline
(R19386)
ECONO operation reduces the maximum operating current and the power consumption.
This operation is particularly convenient for energy-saving. It is also a major bonus when breaker capacity does not allow the use of multiple electrical devices and air conditioners.
It can be easily activated by pushing the ECONO button on the wireless remote controller.
Detail
When this function is activated, the maximum capacity also decreases.
The remote controller can send the ECONO command when the unit is in cooling, heating, dry, or automatic operation. This function can only be set when the unit is running. Pressing the ON/OFF button on the remote controller cancels the function.
This function and POWERFUL operation cannot be used at the same time. The latest command has the priority.
Maximum during normal operation
Power consumption and current
Normal operation
Maximum during ECONO operation
ECONO Operation
Time
(R19427)
Function and Control 24
Main Functions SiBE041434E
1.10 INTELLIGENT EYE Operation (20/25 Class)
Outline
This function detects the presence of humans in the room with a motion sensor (INTELLIGENT
EYE) and reduces the capacity when there is nobody in the room in order to save electricity.
Detail 1. Detection method by INTELLIGENT EYE
sampling (20 msec.)
1 sec.
If the sensor detects the outputs
10 times/sec. or more, it judges humans are in the room.
Sensor output
High
Low
Human motion
Human detection signal
ON
OFF
(R19471)
The sensor detects human motion by receiving infrared rays and displays the pulse wave output.
The microcomputer in the indoor unit carries out a sampling every 20 msec. and if it detects
10 cycles of the wave in 1 second in total, it judges humans are in the room as the motion signal is ON.
The sensor may detect human motion with up to 20 msec. latency.
2. The motions (in cooling)
within
20 min.
20 min.
within
20 min. within
20 min.
Human detection signal
ON
OFF
↑
Reset
↑ ↑
Reset Reset
Target temperature
Remote controller
INTELLIGENT
EYE button
Operation
ON
OFF
ON
OFF
Set speed Set speed
Fan speed (+)
OFF
(R19414)
In FAN operation, the fan speed is reduced by 60 rpm.
When the microcomputer does not have a signal from the sensor in 20 minutes, it judges that nobody is in the room and operates the unit at a temperature shifted from the target temperature. (Cooling / Dry: 1 ~ 2°C higher, Heating: 2°C lower, Auto: according to the operation mode at that time.)
Note:
For dry operation, the temperature cannot be set with a remote controller, but the target temperature is shifted internally.
25 Function and Control
SiBE041434E Main Functions
1.11 2-Area INTELLIGENT EYE Operation (35/42/50 Class)
Outline
The following functions can be performed by a motion sensor (INTELLIGENT EYE).
1. Reduction of the capacity when there is nobody in the room in order to save electricity
(energy saving operation)
2. Dividing the room into plural areas and detecting existence of humans in each area.
Moving the airflow direction to the area with no human automatically to avoid direct airflow on humans.
Detail 1. Detection method of INTELLIGENT EYE
sampling (20 msec.)
Sensor output
High
Low
Human motion
1 sec.
If the sensor detects the outputs 10 times/sec. or more, it judges humans are in the room.
(Condition of 10 times or more output)
Detection signal from the sensor
ON
OFF
3 sec.
If the detection signal (ON) continues 3 sec. or more, it judges humans are in the room.
Human detection signal
ON
OFF
(R21086)
The sensor detects human motion by receiving infrared rays and displays the pulse wave output.
The microcomputer in the indoor unit carries out a sampling every 20 msec. and if it detects
10 cycles of the wave in one second in total, and when the ON signal continues 3 sec., it judges human is in the room as the motion signal is ON.
2-area INTELLIGENT EYE sensor is divided into 2 areas and detects humans in each area.
The sensor may detect human motion with up to 20 msec. latency.
Image of 2-area INTELLIGENT EYE
Wall
Top view
Indoor unit
Area B Area A
A microcomputer judges human presence by the sensor signal from each area A and B.
(R21087)
Function and Control 26
Main Functions SiBE041434E
2. The motions (in cooling)
within
20 min.
20 min.
Human detection signal
ON
OFF
↑
Reset within
20 min.
within
20 min.
↑ ↑
Reset Reset
Target temperature
Remote controller
INTELLIGENT
EYE button
Operation
ON
OFF
ON
OFF
Set speed Set speed
Fan speed (+)
OFF
(R19414)
In FAN operation, the fan speed is reduced by 60 rpm.
When the microcomputer does not have a signal from the sensor in 20 minutes, it judges that nobody is in the room and operates the unit at a temperature shifted from the target temperature. (cooling / dry: 1 ~ 2°C higher, heating: 2°C lower, automatic: according to the operation mode at that time.)
3. Airflow direction in 2-area INTELLIGENT EYE operation
Detection method: The opposite area of detected area is set as the target direction.
Wall
Top view
Indoor unit
Left
Right
Human
Area B
Area A
(R3853)
1. Detection signal ON in both area A and B: Shift the airflow direction to area B (left side)
2. Detection signal ON in area A: Shift the airflow direction to area B (left side)
3. Detection signal ON in area B: Shift the airflow direction to area A (right side)
4. Detection signal OFF in both area A and B: No change
*When the detection signal is OFF for 20 minutes in both area A and B, the unit starts energy saving operation.
Note:
For dry operation, the temperature cannot be set with a remote controller, but the target temperature is shifted internally.
27 Function and Control
SiBE041434E Main Functions
1.12 Inverter POWERFUL Operation
Outline
In order to exploit the cooling and heating capacity to full extent, the air conditioner can be operated by increasing the indoor fan rotating speed and the compressor frequency.
Detail
When the POWERFUL button is pressed, the fan speed and target temperature are converted to the following states for 20 minutes.
Operation mode
COOL
DRY
Fan speed
H tap + A rpm
Dry rotating speed + A rpm
HEAT
FAN
H tap + A rpm
H tap + A rpm
AUTO Same as cooling / heating in
POWERFUL operation
A
= 60 ~ 80 rpm (depending on the model)
Target temperature
18°C
Lowered by 2.5°C
31°C
—
The target temperature is kept unchanged.
Ex: POWERFUL operation in cooling
Target temp.
18˚C
POWERFUL
ON
POWERFUL
OFF
Fan
H tap
Set tap
A rpm
It should be the lower limit of cooling temperature.
20 minutes
It counts 20 minutes also in the remote controller.
Ending condition:
1. After the lapse of 20 minutes.
2. Operation OFF
3. POWERFUL operation is OFF.
(R19177)
Note:
POWERFUL operation cannot be used together with ECONO, COMFORT AIRFLOW, or
OUTDOOR UNIT QUIET operation.
Function and Control 28
Main Functions SiBE041434E
1.13 Clock Setting
ARC466 Series
The clock can be set by taking the following steps:
1. Press the Clock button.
→ is displayed and MON and blink.
2. Press the Select or button to set the clock to the current day of the week.
3. Press the Clock button.
4. Press the Select or button to adjust the clock to the present time.
Holding down the Select or button increases or decreases the time display rapidly.
5. Press the Clock button to set the clock. (Point the remote controller at the indoor unit when pressing the button.)
→
blinks and clock setting is completed.
0:00
Select button
(R19926)
Clock button
29 Function and Control
SiBE041434E Main Functions
1.14 WEEKLY TIMER Operation
Outline
Up to 4 timer settings can be saved for each day of the week (up to 28 settings in total).
The 3 items: ON/OFF, temperature, and time can be set.
Detail
Setting example of the WEEKLY TIMER
The same timer settings are used from Monday through Friday, while different timer settings are used for the weekend.
[Monday]
Make timer settings for programmes 1-4.
Programme 1
ON
Programme 2
OFF
25˚C
6:00 8:30
Programme 3
ON
17:30
27˚C
Programme 4
OFF
22:00
ON OFF ON OFF
[Tuesday] to
[Friday]
[Saturday]
[Sunday]
Use the copy mode to make settings for Tuesday to Friday, because these settings are the same as those for Monday.
Programme 1
ON
Programme 2
OFF
Programme 3
ON
Programme 4
OFF
25˚C 27˚C
6:00 8:30 17:30 22:00
No timer settings
Make timer settings for programmes 1-4.
Programme 1 Programme 2
ON OFF
25˚C
8:00 10:00
27˚C
Programme 3 Programme 4
OFF ON
27˚C
19:00 21:00
ON OFF OFF ON
• Up to 4 reservations per day and 28 reservations per week can be set using the WEEKLY TIMER. The effective use of the copy mode simplifies timer programming.
• The use of ON-ON-ON-ON settings, for example, makes it possible to schedule operating mode and set temperature changes. Furthermore, by using OFF-OFF-OFF-OFF settings, only the turn off time of each day can be set. This will turn off the air conditioner automatically if you forget to turn it off.
Function and Control 30
Main Functions SiBE041434E
To use WEEKLY TIMER operation
Setting mode
• Make sure the day of the week and time are set. If not, set the day of the week and time.
Programme 1 Programme 2 Programme 3
ON OFF ON
[Monday] 25˚C 27˚C
6:00 8:30 17:30
Programme 4
OFF
22:00
Setting Displays
Day and number ON/OFF Time Temperature
1.
Press .
• The day of the week and the reservation number of the current day will be displayed.
• 1 to 4 settings can be made per day.
2.
Press to select the desired day of the week and reservation number.
• Pressing changes the reservation number and the day of the week.
3.
Press .
• The day of the week and reservation number will be set.
• “ ” and “ ON ” blink.
4.
Press to select the desired mode.
• Pressing changes the “ ON ” or “ OFF ” setting in sequence.
blank
No Setting ON TIMER OFF TIMER
• In case the reservation has already been set, selecting “blank” deletes the reservation.
• Proceed to step
9
if “blank” is selected.
• To return to the day of the week and reservation number setting, press .
5.
Press .
• The ON/OFF TIMER mode will be set.
• “ ” and the time blink.
31 Function and Control
SiBE041434E Main Functions
6.
Press to select the desired time.
• The time can be set between 0:00 and 23:50 in 10-minute intervals.
• To return to the ON/OFF TIMER mode setting, press .
• Proceed to step
9
when setting the OFF TIMER.
7.
Press .
• The time will be set.
• “ ” and the temperature blink.
8.
Press to select the desired temperature.
• The temperature can be set between 10˚C and 32˚C.
COOL or AUTO: The unit operates at 18˚C even if it is set to 10 to 17˚C.
HEAT or AUTO: The unit operates at 30˚C even if it is set to 31 to 32˚C.
• To return to the time setting, press .
• The set temperature is only displayed when the mode setting is on.
9.
Press .
• The temperature will be set and go to the next reservation setting.
• The temperature is set while in ON TIMER operation, and the time is set while in OFF
TIMER operation.
• The next reservation screen will appear.
• To continue further settings, repeat the procedure from step
4
.
10.
Press to complete the setting.
• Be sure to direct the remote controller toward the indoor unit and check for a receiving tone and blinking of the OPERATION lamp.
• “ ” is displayed on the LCD and WEEKLY TIMER operation is activated.
• The TIMER lamp lights orange.
Display
• A reservation made once can be easily copied and the same settings used for another
NOTE
Notes on WEEKLY TIMER operation
• Do not forget to set the clock on the remote controller first.
• The day of the week, ON/OFF TIMER mode, time and set temperature (only for ON TIMER mode) can be set with the WEEKLY TIMER.
Other settings for the ON TIMER are based on the settings just before the operation.
• WEEKLY TIMER and ON/OFF TIMER operation cannot be used at the same time. The ON/OFF TIMER operation has priority if it is set while
WEEKLY TIMER is still active. The WEEKLY TIMER will enter the standby state, and “ ” will disappear from the LCD. When the
ON/OFF TIMER is up, the WEEKLY TIMER will automatically become active.
• Only the time and set temperature with the WEEKLY TIMER are sent with the . Set the WEEKLY TIMER only after setting the operation mode, the airflow rate and the airflow direction ahead of time.
• Turning off the circuit breaker, power failure, and other similar events will render operation of the indoor unit’s internal clock inaccurate. Reset the clock.
• can be used only for the time and temperature settings. It cannot be used to go back to the reservation number.
Function and Control 32
Main Functions SiBE041434E
Copy mode
• A reservation made once can be copied to another day of the week. The whole reservation of the selected day of the week will be copied.
Programme 1 Programme 2 Programme 3
ON OFF ON
[Monday]
25˚C 27˚C
6:00 8:30
COPY
17:30
Programme 4
OFF
22:00
Programme 1 Programme 2 Programme 3
ON OFF ON
[Tuesday] to
[Friday]
6:00
25˚C
8:30 17:30
27˚C
Programme 4
OFF
22:00
Setting Displays
Confirmation Copy Paste Normal
1.
Press .
2.
Press to confirm the day of the week to be copied.
3.
Press .
• The whole reservation of the selected day of the week will be copied.
4.
Press to select the destination day of the week.
5.
Press .
• The reservation will be copied to the selected day of the week. The whole reservation of the selected day of the week will be copied.
• To continue copying the settings to other days of the week, repeat step
4
and step
5
.
6.
Press to complete the setting.
• “ ” is displayed on the LCD and WEEKLY TIMER operation is activated.
NOTE
Note on copy mode
•
The entire reservation of the source day of the week is copied in the copy mode.
In the case of making a reservation change for any day of the week individually after copying the content of weekly reservations, press
33 Function and Control
SiBE041434E Main Functions
Confirming a reservation
• The reservation can be confirmed.
Setting Displays
Normal Confirmation
1.
Press .
• The day of the week and the reservation number of the current day will be displayed.
2.
Press to select the day of the week and the reservation number to be confirmed.
• Pressing displays the reservation details.
• To change the confirmed reserved settings, select the reservation number and press
• The mode is switched to setting mode. Proceed to setting mode step
2.
3.
Press to exit the confirmation mode.
• “ ” is displayed on the LCD and WEEKLY TIMER operation is activated.
• The TIMER lamp lights orange.
Display
To deactivate WEEKLY TIMER operation
Press while “ ” is displayed on the LCD.
• The “ ” will disappear from the LCD.
• The TIMER lamp goes off.
• To reactivate the WEEKLY TIMER operation, press again.
• If a reservation deactivated with is activated once again, the last reservation mode will be used.
NOTE
• If not all the reservation settings are reflected, deactivate the WEEKLY TIMER operation once.Then press again to reactivate the WEEKLY TIMER operation.
Function and Control 34
Main Functions SiBE041434E
To delete reservations
An individual reservation
1.
Press .
• The day of the week and the reservation number will be displayed.
2.
Press to select the day of the week and the reservation number to be deleted.
3.
Press .
• “ ” and “ ” or “ ” blink.
4.
Press until no icon is displayed.
• Pressing changes the ON/OFF TIMER mode in sequence.
• Selecting “ blank ” will cancel any reservation you may have.
ON TIMER
OFF TIMER blank
No Setting
5.
Press .
• The selected reservation will be deleted.
6.
Press .
• If there are still other reservations, WEEKLY TIMER operation will be activated.
Reservations for each day of the week
• This function can be used for deleting reservations for each day of the week.
• It can be used while confirming or setting reservations.
1.
Press to select the day of the week to be deleted.
2.
Hold for about 5 seconds.
• The reservation of the selected day of the week will be deleted.
All reservations
Hold for about 5 seconds with the normal display.
• Be sure to direct the remote controller toward the indoor unit and check for a receiving tone.
• This operation cannot be used for the WEEKLY TIMER setting display.
• All reservations will be deleted.
35 Function and Control
SiBE041434E Main Functions
1.15 Other Functions
1.15.1 Hot-Start Function
In order to prevent the cold air blast that normally occurs when heating operation is started, the temperature of the indoor heat exchanger is detected, and the airflow is either stopped or significantly weakened resulting in comfortable heating.
Note:
The cold air blast is prevented using similar control when defrost control starts or when the thermostat is turned ON.
1.15.2 Signal Receiving Sign
When the indoor unit receives a signal from the remote controller, the unit emits a signal receiving sound.
1.15.3 Indoor Unit ON/OFF Button
An ON/OFF button is provided on the display of the unit.
Press the ON/OFF button once to start operation. Press once again to stop it.
The ON/OFF button is useful when the remote controller is missing or the battery has run
out.
The operation mode refers to the following table.
Operation mode
AUTO
Temperature setting
25ºC
Airflow rate
Automatic
Ex. 35/42/50 class
ON/OFF button
(R21335)
<Forced cooling operation>
Forced cooling operation can be started by pressing the ON/OFF button for 5 ~ 9 seconds while the unit is not operating.
Note:
When the ON/OFF button is pressed for 10 seconds or more, the forced cooling operation is stopped.
1.15.4 Auto-restart Function
If a power failure (including one for just a moment) occurs during the operation, the operation restarts automatically when the power is restored in the same condition as before the power failure.
Note:
It takes 3 minutes to restart the operation because the 3-minute standby function is activated.
Function and Control 36
Function of Thermistor
2. Function of Thermistor
SiBE041434E
Electronic expansion valve
(1)
(3)
Four way valve
Compressor
(R14247)
(2)
(1) Outdoor Heat
Exchanger
Thermistor
1. The outdoor heat exchanger thermistor is used for controlling the target discharge pipe temperature. The system sets the target discharge pipe temperature according to the outdoor and indoor heat exchanger temperature, and controls the electronic expansion valve opening so that the target discharge pipe temperature can be obtained.
2. In cooling operation, the outdoor heat exchanger thermistor is used for detecting the disconnection of the discharge pipe thermistor. When the discharge pipe temperature drops below the outdoor heat exchanger temperature by more than a certain value, the discharge pipe thermistor is judged as disconnected.
3. In cooling operation, the outdoor heat exchanger thermistor is used for high pressure protection.
(2) Discharge
Pipe Thermistor
1. The discharge pipe thermistor is used for controlling discharge pipe temperature. If the discharge pipe temperature (used in place of the inner temperature of the compressor) rises abnormally, the operating frequency becomes lower or the operation halts.
2. The discharge pipe thermistor is used for detecting disconnection of the discharge pipe thermistor.
(3) Indoor Heat
Exchanger
Thermistor
1. The indoor heat exchanger thermistor is used for controlling the target discharge pipe temperature. The system sets the target discharge pipe temperature according to the outdoor and indoor heat exchanger temperature, and controls the electronic expansion valve opening so that the target discharge pipe temperature can be obtained.
2. In cooling operation, the indoor heat exchanger thermistor is used for freeze-up protection control. If the indoor heat exchanger temperature drops abnormally, the operating frequency becomes lower or the operation halts.
3. In heating operation, the indoor heat exchanger thermistor is used for detecting the disconnection of the discharge pipe thermistor. When the discharge pipe temperature drops below the indoor heat exchanger temperature by more than a certain value, the discharge pipe thermistor is judged as disconnected.
37 Function and Control
SiBE041434E Control Specification
3. Control Specification
3.1
Mode Hierarchy
Outline
The air conditioner control has normal operation mode, forced operation mode, and power transistor test mode for installation and servicing.
Detail
Air conditioner control mode
Forced operation mode
Forced cooling operation (for pump down operation)
Power transistor test mode
Normal operation mode
Fan
Cooling (includes drying)
Heating
Heating
Defrosting
Stop (indoor unit: OFF)
Preheating operation
Discharging from capacitor
Stop
(R19522)
Note:
Unless specified otherwise, a dry operation command is regarded as cooling operation.
3.2
Frequency Control
Outline
The compressor frequency is determined according to the difference between the room thermistor temperature and the target temperature.
When the shift of the frequency is less than zero (
∆F<0) by PI control, the target frequency is used as the command frequency.
Command frequency
Initial frequency
PI control
Defrost control
Upper limit frequency
FMAX
Limit frequency
Lower limit frequency
FMIN
Dropping function
Input current control, etc.
Upper limit function
Compressor protection function
Skip control
Target frequency
Lower limit function
Four way valve operation compensation, etc.
(R18023)
Function and Control 38
Control Specification SiBE041434E
Detail
Initial Frequency
1. Determine command frequency
Command frequency is determined in the following order of priority.
1. Limiting defrost control time
2. Forced cooling
3. Indoor frequency command
2. Determine upper limit frequency
The minimum value is set as an upper limit frequency among the frequency upper limits of the following functions:
Compressor protection, input current, discharge pipe temperature, heating peak-cut, freezeup protection, defrost.
3. Determine lower limit frequency
The maximum value is set as a lower limit frequency among the frequency lower limits of the following functions:
Four way valve operation compensation, draft prevention, pressure difference upkeep.
4. Determine prohibited frequency
There is a certain prohibited frequency such as a power supply frequency.
When starting the compressor, the frequency is initialized according to the
∆D value of the indoor unit.
<
∆D signal: Indoor Frequency Command>
The difference between the room thermistor temperature and the target temperature is taken as the
∆D signal and is used for frequency command.
Temperature difference
–2.0
–1.5
∆D signal
∗OFF
1
Temperature difference
0
0.5
∆D signal
4
5
Temperature difference
2.0
2.5
∆D signal
8
9
Temperature difference
4.0
4.5
∆D signal
C
D
–1.0
2 1.0
6 3.0
A 5.0
E
–0.5
3
∗
OFF = Thermostat OFF
1.5
7 3.5
B 5.5
F
PI Control 1. P control
The
∆D value is calculated in each sampling time (20 seconds), and the frequency is adjusted according to its difference from the frequency previously calculated.
2. I control
If the operating frequency does not change for more than a certain fixed time, the frequency is adjusted according to the
∆D value.
When the
∆D value is low, the frequency is lowered.
When the
∆D value is high, the frequency is increased.
3. Frequency control when other controls are functioning
When frequency is dropping;
Frequency control is carried out only when the frequency drops.
For controlling lower limit;
Frequency control is carried out only when the frequency rises.
4. Upper and lower limit of frequency by PI control
The frequency upper and lower limits are set according to the command of the indoor unit.
When the indoor or outdoor unit quiet operation command comes from the indoor unit, the upper limit frequency is lower than the usual setting.
39 Function and Control
SiBE041434E Control Specification
3.3
Controls at Mode Changing / Start-up
3.3.1 Preheating Control
Outline
The inverter operation in open phase starts with the conditions of the preheating command from the indoor unit, the outdoor temperature, the discharge pipe temperature, and the radiation fin temperature.
Detail
Outdoor temperature
≥ A°C → Control I
Outdoor temperature < A°C
→ Control II
Control I
ON condition
Discharge pipe temperature < B°C
Radiation fin temperature <85°C
OFF condition
Discharge pipe temperature > C°C
Radiation fin temperature
≥ 90°C
Control II
ON condition
Discharge pipe temperature < D°C
Radiation fin temperature <85°C
OFF condition
Discharge pipe temperature > E°C
Radiation fin temperature
≥ 90°C
A (°C)
–2.5
B (°C)
0
C (°C)
2
D (°C)
10
E (°C)
12
3.3.2 Four Way Valve Switching
Outline
The four way valve coil is energized / not energized depending on the operation. (Heating: ON,
Cooling / Dry / Defrost: OFF) In order to eliminate the switching sound as the four way valve coil switches from ON to OFF when the heating is stopped, the OFF delay switch of the four way valve is carried out.
Detail OFF delay switch of four way valve
The four way valve coil is energized for 160 seconds after the operation is stopped.
Function and Control 40
Control Specification SiBE041434E
3.3.3 Four Way Valve Operation Compensation
Outline
At the beginning of operation as the four way valve is switched, the pressure difference to activate the four way valve is acquired when the output frequency is higher than a certain fixed frequency, for a certain fixed time.
Detail Starting Conditions
1. When the compressor starts and the four way valve switches from OFF to ON
2. When the four way valve switches from ON to OFF during operation
3. When the compressor starts after resetting
4. When the compressor starts after the fault of four way valve switching
The lower limit of frequency keeps A Hz for B seconds with any conditions 1 through 4 above.
A (Hz)
B (seconds)
20/25/35 class 42/50 class
Cooling Heating Cooling Heating
68 66 52
45 60
3.3.4 3-minute Standby
Turning on the compressor is prohibited for 3 minutes after turning it off.
(The function is not activated when defrosting.)
3.3.5 Compressor Protection Function
When turning the compressor from OFF to ON, the upper limit of frequency is set as follows.
(The function is not activated when defrosting.)
(Hz)
Frequency
C
B
A
D E F
(sec.)
Time
(R13528)
A (Hz)
B (Hz)
C (Hz)
D (seconds)
E (seconds)
F (seconds)
20/25/35 class
26
66
72
15
180
180
42/50 class
62
80
98
120
600
60
41 Function and Control
SiBE041434E Control Specification
3.4
Discharge Pipe Temperature Control
Outline
The discharge pipe temperature is used as the internal temperature of the compressor. If the discharge pipe temperature rises above a certain level, the upper limit of frequency is set to keep the discharge pipe temperature from rising further.
Detail
Stop zone
A˚C
B˚C
C˚C
D˚C
Discharge pipe temperature
Dropping zone
Keep zone
Up zone
E˚C
Reset zone
(R14642)
A (°C)
B (°C)
C (°C)
D (°C)
E (°C)
20/25/35/42/50 class
118
108
103
97
85
Zone
Stop zone
Dropping zone
Keep zone
Up zone
Reset zone
Control
When the temperature reaches the stop zone, the compressor stops.
The upper limit of frequency decreases.
The upper limit of frequency is kept.
The upper limit of frequency increases.
The upper limit of frequency is canceled.
Function and Control 42
Control Specification SiBE041434E
3.5
Input Current Control
Outline
The microcomputer calculates the input current while the compressor is running, and sets the frequency upper limit based on the input current.
In case of heat pump models, this control is the upper limit control of frequency and takes priority over the lower limit control of four way valve operation compensation.
Detail
Compressor Stop
(A)
A
Stop Zone
Dropping Zone
B
Keep Zone
C
Input current
Reset Zone
(R14643)
Frequency control in each zone
Stop zone
After 2.5 seconds in this zone, the compressor is stopped.
Dropping zone
The upper limit of the compressor frequency is defined as operation frequency – 2 Hz.
After this, the output frequency is lowered by 2 Hz every second until it reaches the keep zone.
Keep zone
The present maximum frequency goes on.
Reset zone
Limit of the frequency is canceled.
A (A)
B (A)
C
(A)
20/25 class 35 class 42/50 class
Cooling Heating Cooling Heating Cooling Heating
9.25
6.25
5.5
7.5
6.75
9.25
8.25
7.5
10.0
8.5
7.5
Limitation of current dropping and stop value according to the outdoor temperature
The current drops when outdoor temperature becomes higher than a certain level
(depending on the model).
43 Function and Control
SiBE041434E Control Specification
3.6
Freeze-up Protection Control
During cooling operation, the signal sent from the indoor unit determines the frequency upper limit and prevents freezing of the indoor heat exchanger. (The signal from the indoor unit is divided into zones.)
The operating frequency limitation is judged with the indoor heat exchanger temperature.
Indoor heat exchanger thermistor temperature
13˚C
A˚C
B˚C
C˚C
0˚C
Reset zone
Up zone
Keep zone
Dropping zone
Stop zone
(R14718)
20/25 class
35/42/50 class
A (°C)
11
9.5
B (°C)
9
7.5
C (°C)
7
5.5
3.7
Heating Peak-cut Control
During heating operation, the indoor heat exchanger temperature determines the frequency upper limit to prevent abnormal high pressure.
The operating frequency limitation is judged with the indoor heat exchanger temperature.
Stop zone
A˚C
B˚C
C˚C
D˚C
Indoor heat exchanger thermistor temperature
Dropping zone
Keep zone
Up zone
Reset zone
E˚C
(R14645)
A (°C)
B (°C)
C (°C)
D (°C)
E (°C)
20/25/35 class
58
52
49
47
44.5
42/50 class
53
50
47
45
42.5
Zone
Stop zone
Dropping zone
Keep zone
Up zone
Reset zone
Control
When the temperature reaches the stop zone, the compressor stops.
The upper limit of frequency decreases.
The upper limit of frequency is kept.
The upper limit of frequency increases.
The upper limit of frequency is canceled.
Function and Control 44
Control Specification SiBE041434E
3.8
Outdoor Fan Control
1. Fan ON control to cool down the electrical box
The outdoor fan is turned ON when the electrical box temperature is high while the compressor is OFF.
2. Fan OFF control during defrosting
The outdoor fan is turned OFF during defrosting.
3. Fan OFF delay when stopped
The outdoor fan is turned OFF 60 ~ 70 seconds after the compressor stops.
4. Fan speed control for pressure difference upkeep
The rotation speed of the outdoor fan is controlled for keeping the pressure difference during cooling operation with low outdoor temperature.
When the pressure difference is low, the rotation speed of the outdoor fan is reduced.
When the pressure difference is high, the rotation speed of the outdoor fan is controlled as well as normal operation.
5. Fan speed control during forced cooling operation
The outdoor fan is controlled as well as normal operation during forced cooling operation.
6. Fan speed control during POWERFUL operation
The rotation speed of the outdoor fan is increased during POWERFUL operation.
7. Fan speed control during indoor / outdoor unit quiet operation
The rotation speed of the outdoor fan is reduced by the command of the indoor / outdoor unit quiet operation.
8. Fan ON/OFF control when operation (cooling, heating, dry) starts / stops
The outdoor fan is turned ON when the operation starts. The outdoor fan is turned OFF when the operation stops.
3.9
Liquid Compression Protection Function
Outline
In order to increase the dependability of the compressor, the compressor is stopped according to the outdoor temperature and temperature of the outdoor heat exchanger.
Detail
Operation stops depending on the outdoor temperature.
Compressor turns off under the conditions that the system is in cooling operation and outdoor temperature is below –12°C.
45 Function and Control
SiBE041434E Control Specification
3.10 Defrost Control
Outline
Defrosting is carried out by the cooling cycle (reverse cycle). The defrosting time or outdoor heat exchanger temperature must be more than a certain value to finish defrosting.
Detail
Conditions for Starting Defrost
The starting conditions are determined with the outdoor temperature and the outdoor heat exchanger temperature.
The system is in heating operation.
The compressor operates for 6 minutes.
More than A minutes (depending on the duration of the previous defrost control) of accumulated time have passed since the start of the operation, or ending the previous defrosting.
Conditions for Canceling Defrost
The judgment is made with the outdoor heat exchanger temperature. (B°C)
Frequency
C Hz
0 Hz
E sec.
F sec.
G sec.
D Hz
0 Hz
H sec.
PI control
Compressor
ON
OFF
Four way valve
ON
OFF
Fan
ON
OFF
5 ~ 8 sec.
5 ~ 8 sec.
Electronic expansion valve opening
Normal control
J pulse zone
K pulse zone L pulse zone
Starting control
(R21278)
A (minutes)
B (°C)
C (Hz)
D (Hz)
E (seconds)
F (seconds)
G (seconds)
20/25/35 class
28
4 ~ 18
56
56
30
60
480
H (seconds)
J (pulse)
80
450
K (pulse)
L (pulse)
200 ~ 280
200
: The same value continues.
42/50 class
20 ~ 25
6 ~ 30
64
72
40
210
450
90
400
350 ~ 400
400
Function and Control 46
Control Specification SiBE041434E
3.11 Electronic Expansion Valve Control
Outline
The following items are included in the electronic expansion valve control.
Electronic expansion valve is fully closed
1. Electronic expansion valve is fully closed when turning on the power.
2. Pressure equalizing control
Open Control
1. Electronic expansion valve control when starting operation
2. Electronic expansion valve control when the frequency changes
3. Electronic expansion valve control for defrosting
4. Electronic expansion valve control when the discharge pipe temperature is abnormally high
5. Electronic expansion valve control when the discharge pipe thermistor is disconnected
Feedback Control
Target discharge pipe temperature control
Detail
The followings are the examples of electronic expansion valve control which function in each operation mode.
Status
Control
Starting operation control
Control when the frequency changes
Target discharge pipe temperature control
Discharge pipe thermistor disconnection control
High discharge pipe temperature control
Defrost control (heating only)
Pressure equalizing control
Opening limit control
: Available
: Not available
47 Function and Control
SiBE041434E Control Specification
3.11.1 Fully Closing with Power ON
The electronic expansion valve is initialized when turning on the power. The opening position is set and the pressure is equalized.
3.11.2 Pressure Equalizing Control
When the compressor is stopped, the pressure equalizing control is activated. The electronic expansion valve opens and the pressure is equalized.
3.11.3 Opening Limit Control
The maximum and minimum opening of the electronic expansion valve are limited.
Maximum opening (pulse)
Minimum opening (pulse)
20/25/35 class
480
32
42/50 class
500
52
The electronic expansion valve is fully closed when cooling operation stops, and is opened at a fixed degree during defrosting.
3.11.4 Starting Operation Control
The electronic expansion valve opening is controlled when the operation starts, thus preventing superheating or liquid compression.
3.11.5 Control when the Frequency Changes
When the target discharge pipe temperature control is active, if the target frequency changes to a specified value in a certain time period, the target discharge pipe temperature control is canceled and the target opening of the electronic expansion valve is changed according to the frequency shift.
3.11.6 High Discharge Pipe Temperature Control
When the compressor is operating, if the discharge pipe temperature exceeds a certain value, the electronic expansion valve opens and the refrigerant runs to the low pressure side. This procedure lowers the discharge pipe temperature.
Function and Control 48
Control Specification SiBE041434E
3.11.7 Discharge Pipe Thermistor Disconnection Control
Outline
The disconnection of the discharge pipe thermistor is detected by comparing the discharge pipe temperature with the condensation temperature. If the discharge pipe thermistor is disconnected, the electronic expansion valve opens according to the outdoor temperature and the operation frequency, operates for a specified time, and then stops.
After 3 minutes, the operation restarts and checks if the discharge pipe thermistor is disconnected. If the discharge pipe thermistor is disconnected, the system stops after operating for a specified time.
If the disconnection is detected repeatedly, the system is shut down. When the compressor runs for 60 minutes without any error, the error counter is reset.
Detail Determining thermistor disconnection
When the starting control (cooling:
A
seconds, heating:
B
seconds) finishes, the detection timer for disconnection of the discharge pipe thermistor (
C
seconds) starts. When the timer is over, the following adjustment is made.
1. When the operation mode is cooling
When the following condition is fulfilled, the discharge pipe thermistor disconnection is ascertained.
Discharge pipe temperature + 6°C < outdoor heat exchanger temperature
2. When the operation mode is heating
When the following condition is fulfilled, the discharge pipe thermistor disconnection is ascertained.
Discharge pipe temperature + 6°C < indoor heat exchanger temperature
A (seconds)
B (seconds)
C (seconds)
20/25/35 class
10
120
810
42/50 class
10
30
720
When the thermistor is disconnected
When the disconnection is ascertained, the compressor continues operation for 9 minutes and then stops.
If the compressor stops repeatedly, the system is shut down.
3.11.8 Target Discharge Pipe Temperature Control
The target discharge pipe temperature is obtained from the indoor and outdoor heat exchanger temperature, and the electronic expansion valve opening is adjusted so that the actual discharge pipe temperature becomes close to the target discharge pipe temperature. (Indirect
SH (superheating) control using the discharge pipe temperature)
SC
(Subcool)
SH
(Superheat)
The target discharge pipe temperature is set as to become the aim SH.
The inclination does not change depending on the operating condition.
(R18921)
The electronic expansion valve opening and the target discharge pipe temperature are checked every 20 seconds. The opening degree of the electronic expansion valve is adjusted by the followings.
Target discharge pipe temperature
Actual discharge pipe temperature
Previous discharge pipe temperature
49 Function and Control
SiBE041434E Control Specification
3.12 Malfunctions
3.12.1 Sensor Malfunction Detection
Sensor malfunction can be detected in the following thermistors:
1. Outdoor heat exchanger thermistor
2. Discharge pipe thermistor
3. Radiation fin thermistor
4. Outdoor temperature thermistor
3.12.2 Detection of Overcurrent and Overload
Outline
An excessive output current is detected and the OL temperature is observed to protect the compressor.
Detail
If the OL (compressor head) temperature exceeds 120°C, the system shuts down the compressor.
If the inverter current exceeds 9.25 ~ 10 A (depending on the model), the system shuts down the compressor.
3.12.3 Refrigerant Shortage Detection
Detecting by power consumption
If the power consumption is below the specified value and the frequency is higher than the specified frequency, it is regarded as refrigerant shortage.
The power consumption is low comparing with that in the normal operation when refrigerant is insufficient, and refrigerant shortage is detected by checking power consumption.
Refrigerant shortage zone
50 ~ 55 Hz
(depending on the model)
Frequency
(R21198)
Function and Control 50
SiBE041434E
Part 5
Remote Controller
51 Remote Controller
SiBE041434E
1. 20/25 Class
Signal transmitter
20/25 Class
Receiver
Auto Indoor unit quiet Low
Display (LCD)
• Displays the current settings.
(In this illustration, each section is shown with all its displays on for the purpose of explanation.)
• To use the remote controller, aim the transmitter at the indoor unit. If there is anything to block signals between the unit and the remote controller, such as a curtain, the unit will not operate.
• The maximum distance for communication is about 7m.
FAN setting button
• Selects the airflow rate setting.
Temperature adjustment buttons
• Changes the temperature setting.
: AUTO
: DRY
: COOL
: HEAT
: FAN
18 ~ 30
°C
Not available
18 ~ 32
°C
10 ~ 30
°C
Not available
Middle low
On/Off button
• Press this button once to start operation.
Press once again to stop it.
High Middle high Middle
• In indoor unit quiet operation, operation sound becomes weak.
(The airflow rate also decreases.)
• In DRY operation, the airflow rate setting is not available.
Powerful
1
button
• Starts POWERFUL operation.
< ARC466A6 >
Reference
Refer to the following pages for detail.
1 POWERFUL operation
Note:
Refer to the operation manual of applicable model for detail. You can download operation manuals from Daikin Business Portal:
Daikin Business Portal
→ Product Information → Operation/Installation Manual
(URL: https://global1d.daikin.com/business_portal/login/)
(R21337)
Remote Controller 52
20/25 Class
Open the Front Cover
SiBE041434E
Mode button
• Selects the operation mode.
AUTO DRY COOL HEAT FAN
Quiet button
• OUTDOOR UNIT QUIET operation.
• OUTDOOR UNIT QUIET operation is not available in
FAN and DRY operation.
• OUTDOOR UNIT QUIET operation and POWERFUL operation cannot be used at the same time. Priority is given to the function you pressed last.
Comfort
2
button
• The airflow direction will be in upward while in COOL operation, in downward while in HEAT operation. This function will prevent cold or warm air from directly blowing on your body.
Off timer button
• Press this button and adjust the day and time with the
Select button.
Press this button again to complete TIMER setting.
Timer cancel button
• Cancels the timer setting.
• It cannot be used for the
WEEKLY TIMER operation.
Select button
• Changes the ON/OFF
TIMER and WEEKLY
TIMER settings.
Clock
7
button
Econo
3
button
• ECONO operation.
Swing
4
button
• Adjusts the airflow direction.
• When you press the Swing button, the flap moves up and down. The flap stops when you press the Swing button again.
Sensor button
(INTELLIGENT EYE operation
5
)
• To start INTELLIGENT EYE operation, press the Sensor button.
" " is displayed on the LCD.
• To cancel the INTELLIGENT
EYE operation, press the
Sensor button again.
" " disappears from the LCD.
Weekly
: Weekly button
: Program button
Copy
: Copy button
Back
: Back button
Next
: Next button
• WEEKLY TIMER
6
operation.
On Timer button
• Press this button and adjust the day and time with the
Select button.
Press this button again to complete TIMER setting.
(R21338)
Reference
Refer to the following pages for detail.
2 COMFORT AIRFLOW operation
3 ECONO operation
4 Auto-swing setting
5 INTELLIGENT EYE operation
6 WEEKLY TIMER operation
7 Clock setting
Note:
Refer to the operation manual of applicable model for detail. You can download operation manuals from Daikin Business Portal:
Daikin Business Portal
→ Product Information → Operation/Installation Manual
(URL: https://global1d.daikin.com/business_portal/login/)
53 Remote Controller
SiBE041434E
2. 35/42/50 Class
Signal transmitter
35/42/50 Class
Receiver
• To use the remote controller, aim the transmitter at the indoor unit. If there is anything to block signals between the unit and the remote controller, such as a curtain, the unit will not operate.
• The maximum distance for communication is about 7 m.
Fan setting button
• Selects the airflow rate setting.
Auto Indoor unit quiet Low
Display (LCD)
• Displays the current settings.
(In this illustration, each section is shown with all its displays on for the purpose of explanation.)
Temperature adjustment button
• Changes the temperature setting.
: AUTO
: DRY
: COOL
: HEAT
: FAN
18 ~ 30
°C
Not available
18 ~ 32
°C
10 ~ 30
°C
Not available
Middle low
On/Off button
• Press this button once to start operation.
Press once again to stop it.
High Middle high Middle
• In indoor unit quiet operation, operation sound becomes weak.
(The airflow rate also decreases.)
• In DRY operation, the airflow rate setting is not available.
Powerful
1
button
• Starts POWERFUL operation.
< ARC466A9 >
Reference
Refer to the following pages for detail.
1 POWERFUL operation
Note:
Refer to the operation manual of applicable model for detail. You can download operation manuals from Daikin Business Portal:
Daikin Business Portal
→ Product Information → Operation/Installation Manual
(URL: https://global1d.daikin.com/business_portal/login/)
(R21336)
Remote Controller 54
35/42/50 Class SiBE041434E
Open the Front Cover
Mode button
• Selects the operation mode.
AUTO DRY COOL HEAT FAN
Econo
4
/ Quiet button
• Every time you press the
Econo/Quiet button, the setting changes in the following order.
Lamp brightness setting button
• Each time you press the
Brightness button, the brightness of the indoor unit display changes to high, low, or off.
Comfort/Sensor button
(COMFORT AIRFLOW
Operation
2
/ INTELLIGENT
EYE Operation
3
)
• Every time you press the
Comfort/Sensor button, the setting changes in the following order.
ECONO
OUTDOOR UNIT
QUIET blank
No setting
Combination
• OUTDOOR UNIT QUIET operation is not available in
FAN and DRY operation.
• OUTDOOR UNIT QUIET operation and POWERFUL operation cannot be used at the same time. Priority is given to the function you pressed last.
COMFORT
AIRFLOW
INTELLIGENT
EYE
Swing
5
buttons
• Adjusts the airflow direction.
• When you press the Swing button, the flap moves up and down, or (and) the louver moves right and left. The flap
(louver) stops when you press the Swing button again.
blank
No setting
Combination
Off Timer button
• Press this button and adjust the day and time with the
Select button.
Press this button again to complete TIMER setting.
Select button
• Changes the ON/OFF
TIMER and WEEKLY
TIMER settings.
: Weekly button
: Program button
: Copy button
: Back button
: Next button
• WEEKLY TIMER
6
operation.
Timer cancel button
• Cancels the timer setting.
• It cannot be used for the
WEEKLY TIMER operation.
Clock
7
button
On Timer button
• Press this button and adjust the day and time with the
Select button.
Press this button again to complete TIMER setting.
(R19929)
Reference
55
Refer to the following pages for detail.
2 COMFORT AIRFLOW operation
3 2-area INTELLIGENT EYE operation
4 ECONO operation
5 Auto-swing setting
6 WEEKLY TIMER operation
7 Clock setting
Note:
Refer to the operation manual of applicable model for detail. You can download operation manuals from Daikin Business Portal:
Daikin Business Portal
→ Product Information → Operation/Installation Manual
(URL: https://global1d.daikin.com/business_portal/login/)
Remote Controller
SiBE041434E
Part 6
Service Diagnosis
Service Diagnosis
1. General Problem Symptoms and Check Items .....................................57
2. Troubleshooting with LED .....................................................................58
Error Codes and Description ..................................................................62
Indoor Unit PCB Abnormality .................................................................63
Freeze-up Protection Control / Heating Peak-cut Control ......................64
Fan Motor (DC Motor) or Related Abnormality.......................................65
Thermistor or Related Abnormality (Indoor Unit)....................................68
Low-voltage Detection or Over-voltage Detection..................................71
Signal Transmission Error (Between Indoor Unit and Outdoor Unit)......73
Unspecified Voltage (Between Indoor Unit and Outdoor Unit) ...............75
4.10 Outdoor Unit PCB Abnormality...............................................................76
4.11 OL Activation (Compressor Overload) ...................................................78
4.15 Four Way Valve Abnormality..................................................................83
4.16 Discharge Pipe Temperature Control.....................................................85
4.17 High Pressure Control in Cooling ...........................................................86
4.18 Compressor System Sensor Abnormality ..............................................87
4.20 DC Voltage / Current Sensor Abnormality (20/25/35 Class Only) ..........90
4.21 Thermistor or Related Abnormality (Outdoor Unit) .................................91
4.22 Electrical Box Temperature Rise............................................................93
4.23 Radiation Fin Temperature Rise ............................................................94
4.24 Output Overcurrent Detection ................................................................95
Thermistor Resistance Check ................................................................97
Fan Motor Connector Output Check ......................................................98
Power Supply Waveforms Check...........................................................99
Electronic Expansion Valve Check.........................................................99
Four Way Valve Performance Check ...................................................100
Inverter Unit Refrigerant System Check...............................................100
Inverter Analyzer Check .......................................................................101
Rotation Pulse Check on the Outdoor Unit PCB ..................................102
Installation Condition Check.................................................................103
5.10 Discharge Pressure Check...................................................................104
5.11 Outdoor Fan System Check .................................................................104
56
General Problem Symptoms and Check Items SiBE041434E
1. General Problem Symptoms and Check Items
Symptom
The unit does not operate.
Check Item
Check the power supply.
Check the type of the indoor unit.
Measures
Check if the rated voltage is supplied.
Check if the indoor unit type is compatible with the outdoor unit.
Reference
Page
—
—
Operation sometimes stops.
The unit operates but does not cool, or does not heat.
Diagnose with remote controller indication.
Check the remote controller addresses.
Check the power supply.
—
Check if address settings for the remote controller and indoor unit are correct.
A power failure of 2 to 10 cycles stops air conditioner operation. (Operation lamp OFF)
Check the outdoor temperature.
Heating operation cannot be used when the outdoor temperature is 24°CDB or higher, and cooling operation cannot be used when the outdoor temperature is below –10°CDB.
Diagnose with remote controller indication.
Check for wiring and piping errors in the connection between the indoor unit and outdoor unit.
—
—
Check for thermistor detection errors. Check if the thermistor is mounted securely.
Check for faulty operation of the electronic expansion valve.
Set the unit to cooling operation, and check the temperature of the liquid pipe to see if the electronic expansion valve works.
Large operating noise and vibrations
Check the outdoor temperature.
Diagnose with remote controller indication.
Diagnose by service port pressure and operating current.
Check the output voltage of the power module.
Check the power module.
Check the installation condition.
Heating operation cannot be used when the outdoor temperature is 24°CDB or higher, and cooling operation cannot be used when the outdoor temperature is below –10°CDB.
—
Check for refrigerant shortage.
—
—
Check if the required spaces for installation
(specified in the installation manual) are provided.
—
—
—
—
—
—
—
—
57 Service Diagnosis
SiBE041434E Troubleshooting with LED
2. Troubleshooting with LED
2.1
Indoor Unit
Operation Lamp
The operation lamp blinks when any of the following errors is detected.
1. When a protection device of the indoor or outdoor unit is activated, or when the thermistor malfunctions.
2. When a signal transmission error occurs between the indoor and outdoor units.
In either case, conduct the diagnostic procedure described in the following pages.
Ex. 35/42/50 class
Operation lamp
(green)
(R18419)
Service Monitor
The indoor unit has one green LED (LED A) on the control PCB. When the microcomputer
works in order, the LED A blinks. (Refer to page 8, 10 for the location of LED A.)
2.2
Outdoor Unit
The outdoor unit has one green LED (LED A) on the PCB. When the microcomputer works in
order, the LED A blinks. (Refer to page 12, 14 for the location of LED A.)
Service Diagnosis 58
Service Diagnosis SiBE041434E
3. Service Diagnosis
Method 1
1. When the timer cancel button is held down for 5 seconds,
00
is displayed on the temperature display screen.
59
Timer cancel button
< ARC466 Series >
(R21282)
2. Press the timer cancel button repeatedly until a long beep sounds.
The code indication changes in the sequence shown below.
7
8
9
10
11
12
5
6
3
4
No.
1
2
E7
U0
F3
A5
F6
Code
00
U4
L5
E6
H6
H0
A6
19
20
21
22
23
24
No.
13
14
15
16
17
18
J3
J6
E5
A1
E1
Code
C7
A3
H8
H9
C9
C4
C5
31
32
33
34
35
36
No.
25
26
27
28
29
30
EA
AH
FA
H1
P9
Code
UA
UH
P4
L3
L4
H7
U2
Note:
1. A short beep or two consecutive beeps indicate non-corresponding codes.
2. To return to the normal mode, hold the timer cancel button down for 5 seconds. When the remote controller is left untouched for 60 seconds, it also returns to the normal mode.
3. Not all the error codes are displayed. When you cannot find the error code, try method 2.
(
Service Diagnosis
SiBE041434E
Method 2
Service Diagnosis
1. Press the center of the Temp button and the Mode button at the same time.
(R11669)
5C
is displayed on the LCD.
(R11821)
2. Select
5C
(service check) with the Temp or Temp button.
3. Press the Mode button to enter the service check mode.
(R11672)
The left-side number blinks.
(R11670)
4. Press the Temp or Temp button and change the number until you hear the two consecutive beeps or the long beep.
(R11671)
Service Diagnosis 60
Service Diagnosis SiBE041434E
5. Diagnose by the sound.
beep: The left-side number does not correspond with the error code.
two consecutive beeps: The left-side number corresponds with the error code but the right-side number does not.
long beep: Both the left-side and right-side numbers correspond with the error code.
(The numbers indicated when you hear the long beep are the error code.
→
6. Press the Mode button.
(R11672)
The right-side number blinks.
61
(R11673)
7. Press the Temp or Temp button and change the number until you hear the long beep.
(R11671)
8. Diagnose by the sound.
beep: The left-side number does not correspond with the error code.
two consecutive beeps: The left-side number corresponds with the error code but the right-side number does not.
long beep: Both the left-side and right-side numbers correspond with the error code.
9. Determine the error code.
The numbers indicated when you hear the long beep are the error code.
Error codes and description
→
10.Press the Mode button for 5 seconds to exit from the service check mode.
(When the remote controller is left untouched for 60 seconds, it returns to the normal mode also.)
(R11672)
Service Diagnosis
SiBE041434E Troubleshooting
4. Troubleshooting
4.1
Error Codes and Description
Error Codes Description
System
Indoor
Unit
Outdoor
Unit
A6
C4
C9
E1
E5
E6
E7
E8
EA
F3
F6
U4
UA
A1
A5
00
U0
U2
J3
J6
L3
L4
H0
H6
H8
H9
L5
P4
Normal
Refrigerant shortage
Low-voltage detection or over-voltage detection
Signal transmission error (between indoor unit and outdoor unit)
Unspecified voltage (between indoor unit and outdoor unit)
Indoor unit PCB abnormality
Freeze-up protection control / heating peak-cut control
Fan motor (DC motor) or related abnormality
Indoor heat exchanger thermistor or related abnormality
Room temperature thermistor or related abnormality
Outdoor unit PCB abnormality
OL activation (compressor overload)
Compressor lock
DC fan lock
Input overcurrent detection
Four way valve abnormality
Discharge pipe temperature control
High pressure control in cooling
Compressor system sensor abnormality
Position sensor abnormality
DC voltage / current sensor abnormality (20/25/35 class only)
Outdoor temperature thermistor or related abnormality
Discharge pipe thermistor or related abnormality
Outdoor heat exchanger thermistor or related abnormality
Electrical box temperature rise
Radiation fin temperature rise
Output overcurrent detection
Radiation fin thermistor or related abnormality
: Displayed only when system-down occurs.
Reference
Page
—
Service Diagnosis 62
Troubleshooting SiBE041434E
4.2
Indoor Unit PCB Abnormality
Error Code
A1
The system checks if the circuit works properly within the microcomputer of the indoor unit.
Method of Error
Detection
Error Decision
Conditions
Supposed
Causes
The system cannot set the internal settings.
Wrong models interconnected
Defective indoor unit PCB
Disconnection of connector
Reduction of power supply voltage
Troubleshooting
Caution
Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
Check the combination of the indoor and outdoor unit.
63
OK?
YES
Check the connection of connectors (See Note.).
NO
∗ To secure the connection, once disconnect the connector and then reconnect it.
Match the compatible models.
OK?
NO
Correct the connection.
YES
Check the power supply voltage.
Voltage as rated?
YES
Start operation.
NO
Correct the power supply.
Error repeats?
NO
YES
Replace the indoor unit
PCB (control PCB).
Completed.
Error repeats?
YES
Check the power supply voltage.
NO
Voltage as rated?
YES
Start operation.
NO
Correct the power supply.
Error repeats?
NO
YES
Replace the indoor unit
PCB (control PCB).
Completed.
Completed.
(R20421)
Note:
Check the following connector.
Model Type
Wall mounted type
Connector
Terminal board ~ Control PCB (H1, H2, H3)
Service Diagnosis
SiBE041434E Troubleshooting
4.3
Freeze-up Protection Control / Heating Peak-cut Control
Error Code
A5
Method of Error
Detection
Freeze-up protection control
During cooling operation, the freeze-up protection control (operation halt) is activated according to the temperature detected by the indoor heat exchanger thermistor.
Heating peak-cut control
During heating operation, the temperature detected by the indoor heat exchanger thermistor is used for the heating peak-cut control (operation halt, outdoor fan stop, etc.).
Error Decision
Conditions
Supposed
Causes
Freeze-up protection control
During cooling operation, the indoor heat exchanger temperature is below 0°C.
Heating peak-cut control
During heating operation, the indoor heat exchanger temperature is above 53 ~ 58°C
(depending on the model).
Short-circuited air
Clogged air filter of the indoor unit
Dust accumulation on the indoor heat exchanger
Defective indoor heat exchanger thermistor
Defective indoor unit PCB
Troubleshooting
Check No.01
Caution
Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
Check the air passage.
Is there any short circuit?
NO
Check the air filter.
YES
Dirty?
NO
Check the dust accumulation on the indoor heat exchanger.
YES
Dirty?
NO
Check No. 01
Check the indoor heat exchanger thermistor.
YES
As described in the thermistor characteristic chart?
YES
NO
Provide sufficient air passage.
Clean the air filter.
Clean the indoor heat exchanger.
Replace the indoor heat exchanger thermistor.
Replace the indoor unit PCB
(control PCB).
(R20789)
Service Diagnosis 64
Troubleshooting SiBE041434E
4.4
Fan Motor (DC Motor) or Related Abnormality
Error Code
A6
Method of Error
Detection
Error Decision
Conditions
Supposed
Causes
The rotation speed detected by the Hall IC during fan motor operation is used to determine abnormal fan motor operation.
The detected rotation speed does not reach the demanded rotation speed of the target tap, and is less than 50% of the maximum fan motor rotation speed.
Remarkable decrease in power supply voltage
Layer short inside the fan motor winding
Breaking of wire inside the fan motor
Breaking of the fan motor lead wires
Defective capacitor of the fan motor
Defective indoor unit PCB
65 Service Diagnosis
SiBE041434E Troubleshooting
Troubleshooting
Check No.03
20/25 class
Caution
Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
Turn off the power supply.
(Unplug the power cable or turn the breaker off.)
Note: The motor may break when the motor connector is disconnected with the power supply on.
(Turn off the power supply before connecting the connector also.)
Check the connector for connection.
∗ To secure the connection, once disconnect the connector and then reconnect it.
NO
OK?
YES
Foreign matters in or around the fan?
NO
Rotate the fan by hand.
YES
Correct the connection.
Remove the foreign matters.
NO
Fan rotates smoothly?
YES
Check No. 03
Check the fan motor for breakdown or short circuit.
NO
Abnormal sound occurs?
YES
Rubber cushion
Resistance OK?
YES
Turn the power on again.
NO
Check No. 03
Check the motor control voltage.
Bearing rubber cushion
Is the rubber cushion properly fitted?
NO
YES
Replace the bearing rubber cushion.
Correct the position of rubber cushion or replace the rubber cushion.
Replace the indoor fan motor.
Service Diagnosis
Is the motor control voltage 15 VDC generated?
YES
Check No. 03
Check the indoor unit PCB for rotation pulse.
NO
Is the rotation pulse generated?
YES
NO
Replace the indoor unit PCB
(control PCB).
Replace the indoor fan motor.
Replace the indoor unit PCB
(control PCB).
(R20976)
66
Troubleshooting SiBE041434E
Troubleshooting
Check No.02
35/42/50 class
Caution
Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
Check the power supply voltage.
Is the voltage fluctuation within ±10% from the rated value?
YES
Turn off the power and rotate the fan by hand.
NO
Correct the power supply.
Does the fan rotate smoothly?
YES
Turn on the power and start operation.
NO
Does the fan rotate?
YES
Replace the indoor fan motor.
NO
Turn off the power and disconnect the fan motor connector, then turn the power on.
Note: The motor may break when the motor connector is disconnected while the power is turned on.
(Be sure to turn off the power before reconnecting the connector.)
Check No.02
Check the output of the fan motor connector.
Stop the fan motor.
Check No.02
Check the output of the fan motor connector.
Motor power supply voltage 310 ~ 340
VDC?
YES
Motor control voltage 15
VDC generated?
NO
NO
YES
Rotation command voltage
1 ~ 6.5 VDC?
NO
YES
Rotation pulse generated?
YES
NO
Replace the indoor unit PCB (control
PCB).
Replace the indoor unit PCB (control
PCB).
Replace the indoor unit PCB (control
PCB).
Rotation pulse generated?
YES
NO
Replace the indoor fan motor.
Replace the indoor unit PCB (control
PCB).
Replace the indoor fan motor.
Replace the indoor unit PCB (control
PCB).
(R20411)
67 Service Diagnosis
SiBE041434E Troubleshooting
4.5
Thermistor or Related Abnormality (Indoor Unit)
Error Code
C4, C9
The temperatures detected by the thermistors determine thermistor errors.
Method of Error
Detection
Error Decision
Conditions
The voltage between the both ends of the thermistor is 4.96 V and more or 0.04 V and less during compressor operation.
Supposed
Causes
Disconnection of connector
Thermistor corresponding to the error code is defective.
Defective indoor unit PCB
Troubleshooting
Check No.01
Caution
Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
Check the connection of connectors.
Normal?
YES
Check No. 01
Check the thermistor resistance value.
NO
NO
Normal?
YES
Correct the connection.
Replace the thermistor.
Replace the indoor unit PCB
(control PCB).
(R20412)
C4
: Indoor heat exchanger thermistor
C9
: Room temperature thermistor
Service Diagnosis 68
Troubleshooting SiBE041434E
4.6
Refrigerant Shortage
Error Code
U0
Method of Error
Detection
Refrigerant shortage is detected by checking the input current value and the compressor running frequency. If the refrigerant is short, the input current is lower than the normal value.
Error Decision
Conditions
Supposed
Causes
The following conditions continue for 7 minutes.
Input current × input voltage
≤
A × output frequency + B
Output frequency > C
20/25/35 class
42/50 class
A
(constant)
640/256
2813/256
B (W)
0
50
C (Hz)
55
50
If the error repeats, the system is shut down.
Reset condition: Continuous run for about 60 minutes without any other error
Disconnection of the discharge pipe thermistor, indoor or outdoor heat exchanger thermistor, room or outdoor temperature thermistor
Closed stop valve
Refrigerant shortage (refrigerant leakage)
Poor compression performance of compressor
Defective electronic expansion valve
69 Service Diagnosis
SiBE041434E Troubleshooting
Troubleshooting
Check No.01
Check No.12
Caution
Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
Any thermistor disconnected?
NO
Stop valve closed?
NO
Check for refrigerant shortage.
YES
∗ Discharge pipe thermistor
∗ Indoor or outdoor heat exchanger thermistor
∗ Room temperature thermistor
∗ Outdoor temperature thermistor
Replace the thermistor(s) in position.
YES
Open the stop valve.
Oil oozing at relay pipe connections?
NO
Oil oozing at internal piping?
NO
YES
YES
Check No. 12
Electronic expansion valve functioning?
YES
Change for a specified amount of fresh refrigerant.
NO
Repair the pipe flare or replace the union.
Compressor vibrating too much?
YES
NO
Check the pipes for improper contact and correct them as required.
Replace the cracked pipe.
Check the power transistor harness for loosening.
Correct it as required. Also replace the cracked pipe.
Replace the electronic expansion valve.
NO
Refrigerant shortage error again?
YES
Check No. 01
Check the thermistors.
NG
OK
Replace the outdoor unit PCB
(main PCB).
NO
Error again?
YES
Completed.
Replace the defective thermistor(s).
Completed.
Replace the compressor.
(R20401)
Service Diagnosis 70
Troubleshooting
4.7
Low-voltage Detection or Over-voltage Detection
Error Code
U2
Method of Error
Detection
Indoor Unit
The zero-cross detection of the power supply is evaluated by the indoor unit PCB.
Outdoor Unit
Low-voltage detection:
An abnormal voltage drop is detected by the DC voltage detection circuit.
Over-voltage detection:
An abnormal voltage rise is detected by the over-voltage detection circuit.
SiBE041434E
Error Decision
Conditions
Supposed
Causes
Indoor Unit
There is no zero-cross detection in approximately 10 seconds.
Outdoor Unit
Low-voltage detection:
The voltage detected by the DC voltage detection circuit is below 150 ~ 180 V (depending on
the model).
The compressor stops if the error occurs, and restarts automatically after 3-minute standby.
Over-voltage detection:
An over-voltage signal is fed from the over-voltage detection circuit to the microcomputer.
The compressor stops if the error occurs, and restarts automatically after 3-minute standby.
Power supply voltage is not as specified.
Defective DC voltage detection circuit
Defective over-voltage detection circuit
Defective PAM control part
Disconnection of compressor harness
Short circuit inside the fan motor winding
Noise
Momentary drop of voltage
Momentary power failure
Defective outdoor unit PCB
Defective indoor unit PCB
71 Service Diagnosis
SiBE041434E Troubleshooting
Troubleshooting
Caution
Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
Check the power supply voltage.
Is the voltage fluctuation within ±10% from the rated value?
YES
Check the connection of the compressor harness.
NO
Correct the power supply.
Loose or disconnected?
NO
YES
Reconnect the harness.
Does the outdoor fan rotate smoothly?
NO
Replace the outdoor fan motor and the outdoor unit PCB
(main PCB).
YES
Turn on the power. System restarted? (Repeat a few times.)
(Precaution before turning on the power again)
Make sure the power has been off for at least 30 seconds.
YES
Disturbance factors
∗ Noise
∗ Power supply distortion
Check for such factors for a long term.
NO
Error again within 3 minutes after turning on the power?
YES
NO
Replace the outdoor unit PCB (main PCB).
Replace the indoor unit PCB (control PCB).
(R20413)
Service Diagnosis 72
Troubleshooting SiBE041434E
4.8
Signal Transmission Error (Between Indoor Unit and
Outdoor Unit)
Error Code
U4
The data received from the outdoor unit in signal transmission is checked whether it is normal.
Method of Error
Detection
Error Decision
Conditions
The data sent from the outdoor unit cannot be received normally, or the content of the data is abnormal.
Supposed
Causes
Reduction of power supply voltage
Wiring error
Breaking of the connecting wires between the indoor and outdoor units (wire No. 3)
Defective outdoor unit PCB
Short circuit inside the fan motor winding
Defective indoor unit PCB
Disturbed power supply waveform
73 Service Diagnosis
SiBE041434E Troubleshooting
Troubleshooting
Check No.11
Caution
Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
Check the power supply voltage.
NO
Correct the power supply.
YES
Check the indoor unit - outdoor unit connection wires.
Is there any wiring error?
NO
Check the voltage of the connection wires on the indoor terminal board between No. 1 and No. 3, and between No. 2 and No. 3.
YES
Correct the indoor unit - outdoor unit connection wires.
Properly insulated?
YES
NO
Replace the connection wires between the indoor unit and outdoor unit.
Check the LED A on the outdoor unit PCB.
∗ Before you check the LED A, cancel the standby electricity saving function by starting fan operation with the remote controller.
∗ Wait at least for 7 sec. after turning on the power.
Continuously ON or OFF
Is LED A blinking?
Blink
Diagnose the outdoor unit
PCB (main PCB).
Rotate the outdoor fan by hand.
Does the outdoor fan rotate smoothly?
YES
Check No.11
Check the power supply waveform.
NO
Replace the outdoor fan motor and the outdoor unit PCB
(main PCB).
Is there any disturbance?
YES
NO
Replace the indoor unit PCB
(control PCB).
Locate the cause of the disturbance of the power supply waveform, and correct it.
(R21199)
Service Diagnosis 74
Troubleshooting SiBE041434E
4.9
Unspecified Voltage (Between Indoor Unit and Outdoor
Unit)
Error Code
UA
Method of Error
Detection
The supply power is detected for its requirements (pair type is different from multi type) by the indoor / outdoor transmission signal.
Error Decision
Conditions
Supposed
Causes
The pair type and multi type are interconnected.
Wrong models interconnected
Wrong wiring of connecting wires
Wrong indoor unit PCB or outdoor unit PCB mounted
Defective indoor unit PCB
Defective outdoor unit PCB
Troubleshooting
Caution
Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
Check the combination of the indoor and outdoor unit.
NO
OK?
YES
Are the connecting wires connected properly?
YES
NO
Match the compatible models.
Correct the connection.
Check the code numbers
(2P012345, for example) of the indoor and outdoor unit PCB with the Parts List.
If not matched, change for the correct PCB.
(R20435)
75 Service Diagnosis
SiBE041434E
4.10 Outdoor Unit PCB Abnormality
Error Code
E1
Method of Error
Detection
The system checks if the microprocessor is working in order.
The system checks if the zero-cross signal comes in properly.
Error Decision
Conditions
Supposed
Causes
The microprocessor program runs out of control.
The zero-cross signal is not detected.
Defective outdoor unit PCB
Broken harness between PCBs
Noise
Momentary drop of voltage
Momentary power failure
Troubleshooting
Troubleshooting 20/25/35 class
Caution
Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
Turn on the power again.
∗ Before you check the LED A, cancel the standby electricity saving function by starting fan operation with the remote controller.
∗ Wait at least for 7 sec. after turning on the power.
Continuously ON or OFF
Is LED A blinking?
Replace the outdoor unit
PCB (main PCB).
Blink
Check if the outdoor unit is grounded.
NO
Grounded?
YES
Is the harness broken?
YES
NO
Ground the system.
Zero-cross signal abnormality.
Replace the outdoor unit
PCB (filter PCB).
Replace the harness.
(R21200)
Service Diagnosis 76
Troubleshooting SiBE041434E
Troubleshooting 42/50 class
Caution
Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
Turn on the power again.
∗ Before you check the LED A, cancel the standby electricity saving function by starting fan operation with the remote controller.
∗ Wait at least for 7 sec. after turning on the power.
Continuously ON or OFF
Is LED A blinking?
Replace the outdoor unit
PCB (main PCB).
Blink
Check if the outdoor unit is grounded.
NO
Grounded?
YES
Ground the system.
Zero-cross signal abnormality.
Replace the outdoor unit
PCB (main PCB).
(R21201)
77 Service Diagnosis
SiBE041434E Troubleshooting
4.11 OL Activation (Compressor Overload)
Error Code
E5
A compressor overload is detected through compressor OL.
Method of Error
Detection
Error Decision
Conditions
If the error repeats, the system is shut down.
Reset condition: Continuous run for about 60 minutes without any other error
Supposed
Causes
Disconnection of discharge pipe thermistor
Defective discharge pipe thermistor
Disconnection of connector S40
Disconnection of 2 terminals of OL (Q1L)
Defective OL (Q1L)
Broken OL harness
Defective electronic expansion valve or coil
Defective four way valve or coil
Defective outdoor unit PCB
Refrigerant shortage
Water mixed in refrigerant
Defective stop valve
Service Diagnosis 78
Troubleshooting SiBE041434E
Troubleshooting
Check No.01
Check No.12
Check No.13
Check No.14
Caution
Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
Discharge pipe thermistor disconnected?
NO
Check No. 01
Check the thermistors.
OK
Connectors are properly connected?
YES
NG
∗ Discharge pipe thermistor
YES
Disconnect the connector S40 from the PCB.
NO
∗ Connector S40
∗ 2 terminals of OL (Q1L)
Insert the thermistor in position.
Replace the discharge pipe thermistor.
Connect the connectors properly.
Check the resistance
Resistance
∞ between the 2 terminals on connector S40.
Disconnect the 2 terminals of the OL (Q1L).
Nearly 0
Ω
Check the
Resistance resistance between the
∞
Replace the OL (Q1L).
2 terminals of the OL
(Q1L).
Nearly 0
Ω
Replace the OL harness.
Check No. 12
Check the electronic expansion valve.
OK
Check No. 13
Check the four way valve.
OK
Check No. 14
Check the refrigerant line.
OK
NG
NG
NG
∗ Refrigerant shortage
∗ Water mixed
∗ Stop valve
Replace the electronic expansion valve or the coil.
Replace the four way valve or the coil.
Replace the outdoor unit
PCB (main PCB).
Refer to the refrigerant line check procedure.
Replace the outdoor unit
PCB (main PCB).
(R20415)
Note:
OL (Q1L) activating temperature: 120°C
OL (Q1L) recovery temperature: 95°C
79 Service Diagnosis
SiBE041434E Troubleshooting
4.12 Compressor Lock
Error Code
E6
Method of Error
Detection
A compressor lock is detected by checking the compressor running condition through the position detection circuit.
Error Decision
Conditions
Operation stops due to overcurrent.
If the error repeats, the system is shut down.
Reset condition: Continuous run for about 11 minutes without any other error
Supposed
Causes
Compressor locked
Compressor harness disconnected
Troubleshooting
Check No.12
Check No.15
Caution
Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
(Precaution before turning on the power again)
Make sure the power has been off for at least 30 seconds.
Turn off the power. Disconnect the harnesses U, V, and W.
Check No.15
Check with the inverter analyzer.
∗ Inverter analyzer:
RSUK0917C
Any LED off?
YES
Turn off the power and reconnect the harnesses. Turn on the power again and restart the system.
NO
Emergency stop without compressor running?
NO
System shut down after errors repeated several times?
YES
NO
YES
Correct the power supply or replace the outdoor unit
PCB (main PCB).
Replace the compressor.
Check the electronic expansion valve coil.
Replace it as required.
Go to Check No. 12.
Replace the compressor.
(R21163)
Service Diagnosis 80
Troubleshooting SiBE041434E
4.13 DC Fan Lock
Error Code
E7
An error is determined with the high-voltage fan motor rotation speed detected by the Hall IC.
Method of Error
Detection
Error Decision
Conditions
The fan does not start in about 15 ~ 30 seconds even when the fan motor is running.
If the error repeats, the system is shut down.
Reset condition: Continuous run for about 11 minutes without any other error
Supposed
Causes
Disconnection of the fan motor
Foreign matter stuck in the fan
Defective fan motor
Defective outdoor unit PCB
Troubleshooting
Check No.16
Caution
Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
YES
Fan motor connector disconnected?
NO
Turn off the power and reconnect the connector.
YES
Foreign matters in or around the fan?
NO
Turn on the power.
Remove the foreign matters.
Rotate the fan.
Fan rotates smoothly?
YES
Check No. 16
Check the rotation pulse input on the outdoor unit PCB (main PCB).
NO
Pulse signal generated?
YES
NO
Replace the outdoor fan motor.
Replace the outdoor fan motor.
Replace the outdoor unit
PCB (main PCB).
(R20416)
81 Service Diagnosis
SiBE041434E Troubleshooting
4.14 Input Overcurrent Detection
Error Code
E8
Method of Error
Detection
An input overcurrent is detected by checking the input current value with the compressor running.
Error Decision
Conditions
Supposed
Causes
The current exceeds about 9.25 ~ 10 A (depending on the model) for 2.5 seconds with the compressor running.
(The upper limit of the current decreases when the outdoor temperature exceeds a certain level.)
Outdoor temperature is out of operation range.
Defective compressor
Defective power module
Defective outdoor unit PCB
Short circuit
Troubleshooting
Check No.15
Check No.17
Caution
Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
∗ An input overcurrent may result from wrong internal wiring. If the system is interrupted by an input overcurrent after the wires have been disconnected and reconnected for part replacement, check the wiring again.
Check No. 17
Check the installation condition.
Start operation and measure the input current.
Check No.18
Input current flowing above its stop level?
YES
Turn off the power and disconnect the harnesses U, V, and W.
NO
Is the fuse (+) blown?
Check No.15
Check with the inverter analyzer.
∗ Inverter analyzer:
RSUK0917C
YES
NO
Replace the outdoor unit
PCB (main PCB and filter
PCB).
Replace the fuse.
Any LED off?
NO
Turn off the power, and reconnect the harnesses. Turn on the power again and start operation.
YES
Check No. 18
Check the discharge pressure.
FU3
Correct the power supply or replace the outdoor unit
PCB (main PCB).
(R20437)
Service Diagnosis 82
Troubleshooting SiBE041434E
4.15 Four Way Valve Abnormality
Error Code
EA
Method of Error
Detection
The room temperature thermistor and the indoor heat exchanger thermistor are checked if they function within their normal ranges in each operation mode.
Error Decision
Conditions
Supposed
Causes
A following condition continues over 10 minutes after operating for 5 minutes.
< Cooling / Dry >
A – B < –5°C
< Heating >
B – A < –5°C
A: Room thermistor temperature
B: Indoor heat exchanger temperature
If the error repeats, the system is shut down.
Reset condition: Continuous run for about 60 minutes without any other error
Disconnection of four way valve coil
Defective four way valve, coil, or harness
Defective outdoor unit PCB
Defective thermistor
Refrigerant shortage
Water mixed in refrigerant
Defective stop valve
83 Service Diagnosis
SiBE041434E Troubleshooting
Troubleshooting
Check No.01
Check No.13
Check No.14
Caution
Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
YES
Four way valve coil disconnected (loose)?
NO
Correct the four way valve coil.
YES
Harness disconnected?
Reconnect the harness.
NO
Check the continuity of the four way valve coil and harness.
Disconnect the harness from the connector.
Resistance between harnesses about
1000 ~ 2000
Ω?
YES
NO
Check No. 13
Check the four way valve switching output.
OK
Any thermistor disconnected?
NO
Check No. 01
Check the thermistors.
OK
Check No. 14
Check the refrigerant line.
OK
NG
YES
NG
NG
∗ Refrigerant shortage
∗ Water mixed
∗ Stop valve
Replace the four way valve coil.
Replace the outdoor unit PCB (main PCB).
Reconnect the thermistor(s).
Replace the defective thermistor(s).
Refer to the refrigerant line check procedure.
Replace the four way valve
(defective or dust-clogged).
(R21202)
Service Diagnosis 84
Troubleshooting SiBE041434E
4.16 Discharge Pipe Temperature Control
Error Code
F3
An error is determined with the temperature detected by the discharge pipe thermistor.
Method of Error
Detection
Error Decision
Conditions
If the temperature detected by the discharge pipe thermistor rises above A°C, the compressor stops.
The error is cleared when the discharge pipe temperature has dropped below B°C.
<20/25/35 class>
(1) above 50 Hz (rising), above 45 Hz (dropping)
(2) 39 ~ 50 Hz (rising), 34 ~ 45 Hz (dropping)
(3) below 39 Hz (rising), below 34 Hz (dropping)
A (°C)
118
113
103
B (°C)
85
80
70
<42/50 class>
(1) above 50 Hz (rising), above 45 Hz (dropping)
(2) 21 ~ 50 Hz (rising), 16 ~ 45 Hz (dropping)
(3) below 21 Hz (rising), below 16 Hz (dropping)
A (°C)
118
106
98
B (°C)
85
73
65
If the error repeats, the system is shut down.
Reset condition: Continuous run for about 60 minutes without any other error
Supposed
Causes
Defective discharge pipe thermistor
(Defective outdoor heat exchanger thermistor or outdoor temperature thermistor)
Defective electronic expansion valve or coil
Refrigerant shortage
Defective four way valve
Water mixed in refrigerant
Defective stop valve
Defective outdoor unit PCB
Troubleshooting
Check No.01
Check No.12
Check No.14
Caution
Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
Check No. 01
Check the thermistors.
NG
∗
Discharge pipe thermistor
∗
Outdoor heat exchanger thermistor
∗
Outdoor temperature thermistor
Replace the thermistor(s).
defective
OK
Check No. 12
Check the electronic expansion valve.
OK
Check No. 14
Check the refrigerant line.
OK
NG
NG
∗
Refrigerant shortage
∗
Four way valve
∗
Water mixed
∗
Stop valve
Replace the electronic expansion valve or the coil.
Refer to the refrigerant line check procedure.
Replace the outdoor unit
PCB (main PCB).
(R20417)
85 Service Diagnosis
SiBE041434E Troubleshooting
4.17 High Pressure Control in Cooling
Error Code
F6
Method of Error
Detection
Error Decision
Conditions
High-pressure control (operation halt, frequency drop, etc.) is activated in cooling operation if the temperature sensed by the outdoor heat exchanger thermistor exceeds the limit.
The temperature sensed by the outdoor heat exchanger thermistor rises above 53 ~ 57°C
(depending on the model).
The error is cleared when the temperature drops below 48 ~ 50°C (depending on the model).
Supposed
Causes
The installation space is not large enough.
Dirty outdoor heat exchanger
Defective outdoor fan motor
Defective stop valve
Defective electronic expansion valve or coil
Defective outdoor heat exchanger thermistor
Defective outdoor unit PCB
Troubleshooting
Check No.01
Caution
Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
Check the installation space.
Check No.12
Check No.17
Check No.18
Check No.19
Check No. 17
Check the installation condition.
OK
Check No. 19
Check the outdoor fan.
OK
Check No. 18
Check the discharge pressure.
OK
Check No. 12
Check the electronic expansion valve.
OK
Check No. 01
Check the outdoor heat exchanger thermistor.
OK
NG
NG
NG
NG
NG
Change the installation location or direction.
Clean the outdoor heat exchanger.
Replace the outdoor fan motor.
Reconnect the connector or fan motor lead wires.
Replace the stop valve.
Replace the electronic expansion valve or the coil.
Replace the outdoor unit
PCB (main PCB).
Replace the outdoor heat exchanger thermistor.
Replace the outdoor unit
PCB (main PCB).
(R20418)
Service Diagnosis 86
Troubleshooting SiBE041434E
4.18 Compressor System Sensor Abnormality
Error Code
H0
The system checks the DC current before the compressor starts.
Method of Error
Detection
Error Decision
Conditions
The DC current before compressor start-up is out of the range 0.5 ~ 4.5 V (sensor output converted to voltage value).
The DC voltage before compressor start-up is below 50 V.
Supposed
Causes
Broken or disconnected harness
Defective outdoor unit PCB
Troubleshooting
Caution
Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
Check the relay harness for the compressor.
Is the harness broken?
NO
Turn off the power. Then, turn on the power to restart the system.
YES
Replace the harness.
Restart operation and error displayed again?
YES
NO
No problem.
Keep on running.
Replace the outdoor unit
PCB (main PCB).
(R21434)
87 Service Diagnosis
SiBE041434E Troubleshooting
4.19 Position Sensor Abnormality
Error Code
H6
Method of Error
Detection
A compressor start-up failure is detected by checking the compressor running condition through the position detection circuit.
Error Decision
Conditions
If the error repeats, the system is shut down.
Reset condition: Continuous run for about 11 minutes without any other error
Supposed
Causes
Disconnection of the compressor relay cable
Defective compressor
Defective outdoor unit PCB
Start-up failure caused by the closed stop valve
Input voltage is outside the specified range.
Service Diagnosis 88
Troubleshooting SiBE041434E
Troubleshooting
Check No.15
Caution
Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
Turn off the power.
Check No.18
Check the power supply voltage.
Check No.20
Voltage as rated?
YES
Check No. 18
Check the discharge pressure.
NO
Correct the power supply.
OK?
YES
Check No. 20
Check the short circuit of the diode bridge.
NO
Normal?
YES
Check the connection.
NO
Electrical components or compressor harnesses connected as specified?
YES
Turn on the power. Check the electrolytic capacitor voltage.
NO
320 ± 50 VDC?
YES
Turn off the power. Disconnect the harnesses U, V, and W.
NO
Check No.15
Check with the inverter analyzer.
∗ Inverter analyzer:
RSUK0917C
NO
Any LED OFF?
YES
Replace the stop valve.
Replace the outdoor unit
PCB (main PCB).
Reconnect the electrical components or compressor harnesses as specified.
Replace the outdoor unit
PCB (main PCB).
Replace the compressor.
Correct the power supply or replace the outdoor unit
PCB (main PCB).
(R20422)
89 Service Diagnosis
SiBE041434E Troubleshooting
4.20 DC Voltage / Current Sensor Abnormality (20/25/35 Class
Only)
Error Code
H8
Method of Error
Detection
DC voltage or DC current sensor abnormality is identified based on the compressor running frequency and the input current.
Error Decision
Conditions
If the error repeats, the system is shut down.
Reset condition: Continuous run for about 60 minutes without any other error
Supposed
Causes
Troubleshooting
Defective outdoor unit PCB
Caution
Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
Replace the outdoor unit PCB (main PCB).
Service Diagnosis 90
Troubleshooting SiBE041434E
4.21 Thermistor or Related Abnormality (Outdoor Unit)
Error Code
H9, J3, J6, P4
Method of Error
Detection
This fault is identified based on the thermistor input voltage to the microcomputer.
A thermistor fault is identified based on the temperature sensed by each thermistor.
Error Decision
Conditions
The voltage between the both ends of the thermistor is 4.96 V and more or 0.04 V and less during compressor operation.
J3
error is judged if the discharge pipe temperature is lower than the heat exchanger temperature.
Supposed
Causes
Disconnection of the connector for the thermistor
Thermistor corresponding to the error code is defective.
Defective heat exchanger thermistor in the case of
J3
error (outdoor heat exchanger thermistor in cooling operation, or indoor heat exchanger thermistor in heating operation)
Defective outdoor unit PCB
Troubleshooting In case of
P4
Caution
Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
Replace the outdoor unit PCB (main PCB).
P4
: Radiation fin thermistor
91 Service Diagnosis
SiBE041434E Troubleshooting
Troubleshooting
Check No.01
In case of
H9
,
J3
,
J6
Caution
Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
Turn on the power again.
Error displayed again on remote controller?
YES
Check No. 01
Check the thermistor resistance value.
NO
Normal?
J3 error: the discharge pipe temperature is lower than the heat exchanger temperature.
Cooling: Outdoor heat exchanger temperature
Heating: Indoor heat exchanger temperature
YES
Check No. 01
Check the indoor heat exchanger thermistor resistance value in the heating operation.
NO
Indoor heat exchanger thermistor functioning?
YES
NO
Reconnect the connectors or thermistors.
Replace the defective thermistor(s) of the following thermistors.
∗ Outdoor temperature thermistor
∗ Discharge pipe thermistor
∗ Outdoor heat exchanger thermistor
Replace the indoor heat exchanger thermistor.
Replace the outdoor unit
PCB (main PCB).
(R20406)
H9
: Outdoor temperature thermistor
J3
: Discharge pipe thermistor
J6
: Outdoor heat exchanger thermistor
Service Diagnosis 92
Troubleshooting SiBE041434E
4.22 Electrical Box Temperature Rise
Error Code
L3
Method of Error
Detection
An electrical box temperature rise is detected by checking the radiation fin thermistor with the compressor off.
Error Decision
Conditions
With the compressor off, the radiation fin temperature is above A°C.
The error is cleared when the radiation fin temperature drops below B°C.
To cool the electrical components, the outdoor fan starts when the radiation fin temperature rises above C°C. The outdoor fan stops when the radiation fin temperature drops below
B°C.
20/25/35 class
42/50 class
A (°C)
98
90
B (°C)
75
64
C (°C)
83
81
Supposed
Causes
Defective outdoor fan motor
Short circuit
Defective radiation fin thermistor
Disconnection of connector
Defective outdoor unit PCB
Troubleshooting
Check No.17
Check No.19
Caution
Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
Turn off the power. Then, turn on the power to restart the system.
WARNING
To cool the electrical components, the outdoor fan starts when the radiation fin temperature rises above C ˚C. The outdoor fan stops when the radiation fin temperature drops below B ˚C.
YES
Error again or outdoor fan activated?
NO
Check the radiation fin temperature.
Above
A
˚C?
YES
NO
Replace the outdoor unit
PCB (main PCB).
93
Check No. 19
Check the outdoor fan.
OK
Radiation fin dirty?
YES
NG
NO
Replace the outdoor fan motor.
Correct the connectors and fan motor lead wire.
Replace the outdoor unit
PCB (main PCB).
Check the installation condition.
Go to Check No. 17.
Clean up the radiation fin.
(R21436)
Service Diagnosis
SiBE041434E Troubleshooting
4.23 Radiation Fin Temperature Rise
Error Code
L4
Method of Error
Detection
A radiation fin temperature rise is detected by checking the radiation fin thermistor with the compressor on.
Error Decision
Conditions
If the radiation fin temperature with the compressor on is above A°C.
The error is cleared when the radiation fin temperature drops below B°C.
If the error repeats, the system is shut down.
Reset condition: Continuous run for about 60 minutes without any other error
20/25/35 class
42/50 class
A (°C)
98
100
B (°C)
78
57
Supposed
Causes
Defective outdoor fan motor
Short circuit
Defective radiation fin thermistor
Disconnection of connector
Defective outdoor unit PCB
Silicon grease is not applied properly on the radiation fin after replacing the outdoor unit
PCB.
Troubleshooting
Check No.17
Caution
Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
Turn off the power. Then, turn on the power to restart the system.
Check No.19
Error displayed again?
NO
YES
Has the PCB been replaced?
NO
Check the radiation fin temperature.
YES
Check if silicon grease is applied properly on the radiation fin. If not, apply the silicon grease.
Above A ˚C?
YES
NO
Replace the outdoor unit
PCB (main PCB).
Check No. 19
Check the outdoor fan.
OK
Radiation fin dirty?
YES
NG
NO
Replace the outdoor fan motor.
Correct the connectors and fan motor leads.
Replace the outdoor unit
PCB (main PCB).
Check the installation condition.
Go to Check No. 17.
Clean up the radiation fin.
(R21437)
Note:
Refer to Silicon Grease on Power Transistor / Diode Bridge on page 115 for detail.
Service Diagnosis 94
Troubleshooting SiBE041434E
4.24 Output Overcurrent Detection
Error Code
L5
Method of Error
Detection
An output overcurrent is detected by checking the current that flows in the inverter DC section.
Error Decision
Conditions
A position signal error occurs while the compressor is running.
A rotation speed error occurs while the compressor is running.
An output overcurrent signal is fed from the output overcurrent detection circuit to the microcomputer.
If the error repeats, the system is shut down.
Reset condition: Continuous run for about 11 minutes without any other error
Supposed
Causes
Poor installation condition
Closed stop valve
Defective power module
Wrong internal wiring
Abnormal power supply voltage
Defective outdoor unit PCB
Defective compressor
95 Service Diagnosis
SiBE041434E Troubleshooting
Troubleshooting
Check No.15
Check No.17
Caution
Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
∗ An output overcurrent may result from wrong internal wiring. If the system is interrupted by an output overcurrent after the wires have been disconnected and reconnected for part replacement, check the wiring again.
Check No. 17
Check the installation condition.
Check No.18
Stop valve fully open?
YES
Turn off the power. Then, turn on the power to restart the system.
See if the same error occurs.
NO
Fully open the stop valve.
Check No.22
Error again?
YES
Turn off the power and disconnect the harnesses U, V, and W.
NO
Monitor the power supply voltage, discharge and suction pressures, and other factors for a long term.
Possible causes
∗
∗
Momentary drop of power supply voltage
Compressor overload
∗
Short circuit
Check No.15
Check with the inverter analyzer.
∗ Inverter analyzer:
RSUK0917C
Not a malfunction.
Keep observing.
Check the connectors and other components.
Any LED off?
NO
Check No. 22
Check the power module.
YES
Normal?
YES
Turn off the power, and reconnect the harnesses. Turn on the power again and start operation.
NO
Check the power supply voltage.
Correct the power supply or replace the outdoor unit
PCB (main PCB).
Replace the outdoor unit
PCB (main PCB).
Voltage as rated?
YES
Short circuit or wire breakage between compressor's coil phases?
YES
NO
NO
Correct the power supply.
Check the discharge pressure.
Go to Check No. 18.
Replace the compressor.
(R21438)
Service Diagnosis 96
Check SiBE041434E
5. Check
5.1
Thermistor Resistance Check
Check No.01
Disconnect the connectors of the thermistors from the PCB, and measure the resistance of each thermistor using a multimeter.
35
40
45
50
15
20
25
30
–5
0
5
10
The data is for reference purpose only.
Resistance (k
Ω)
Thermistor temperature (°C)
Room temperature thermistor of 20/25 class models
–20
–15
–10
73.4
57.0
44.7
35.3
28.2
22.6
18.3
14.8
12.1
10.0
8.2
Other thermistors
197.8
148.2
112.1
85.60
65.93
51.14
39.99
31.52
25.02
20.00
16.10
6.9
5.8
13.04
10.62
4.9
8.707
4.1
7.176
(R25°C = 10 k
Ω, B = 3435 K) (R25°C = 20 kΩ, B = 3950 K)
(k
Ω)
Room temperature thermistor of 20/25 class models
50
(k
Ω)
150
Other thermistors
97
100
25
50
0
–15 0 15 30
45
(˚C)
–15
0 15 30
45
(˚C) (R11952)
Multimeter
Resistance range
Room temperature thermistor
(R21542)
Multimeter
(R20505)
When the room temperature thermistor is soldered on a PCB, remove the PCB from the control PCB to measure the resistance.
When the connector of indoor heat exchanger thermistor is soldered on a PCB, remove the thermistor and measure the resistance.
Service Diagnosis
SiBE041434E
5.2
Fan Motor Connector Output Check
Check No.02
35/42/50 class
1. Check the connection of connector.
2. Check the motor power supply voltage output (pins 4 - 7).
3. Check the motor control voltage (pins 4 - 3).
4. Check the rotation command voltage (pins 4 - 2).
5. Check the rotation pulse (pins 4 - 1).
S1
3
2
1
5
4
7
6
Motor power supply voltage (310 ~ 340 VDC)
Unused
Unused
GND
Motor control voltage (15 VDC)
Rotation command voltage (1~ 6.5 VDC)
Rotation pulse input
(R19654)
Check No.03
Check
20/25 class
Fan motor wire breakdown / short circuit check
1. Check the connector for connection.
2. Turn the power off.
3. Check if each resistance at the phases U - V and V - W is 90
Ω
~ 100
Ω
(between the pins
12 - 9, and between 9 - 6).
Motor control voltage check
1. Check the connector for connection.
2. Check the motor control voltage is generated (between the pins 2 - 3).
Rotation pulse check
1. Check the connector for connection.
2. Turn the power on and stop the operation.
3. Check if the Hall IC generates the rotation pulse 4 times when the fan motor is manually rotated once (between the pins 1 - 3).
5
4
3
2
1
12
S200
8
7
6
11
10
9
Free pin
Free pin
Free pin
Free pin
Phase U
Phase V
Phase W
Free pin
Free pin
GND
Motor control voltage (15 VDC)
Rotation pulse (5 VDC)
(R11979)
Service Diagnosis 98
Check SiBE041434E
5.3
Power Supply Waveforms Check
Check No.11
Measure the power supply waveform between No. 1 and No. 2 on the terminal board, and check the waveform disturbance.
Check if the power supply waveform is a sine wave (Fig.1).
Check if there is waveform disturbance near the zero-cross (sections circled in Fig.2).
Fig.1
Fig.2
(R1444)
(R1736)
5.4
Electronic Expansion Valve Check
Check No.12
Conduct the followings to check the electronic expansion valve (EV).
1. Check if the EV connector is correctly connected to the PCB.
2. Turn the power off and on again, and check if the EV generates a latching sound.
3. If the EV does not generate a latching sound in the above step 2, disconnect the connector and check the continuity using a multimeter.
4. Check the continuity between the pins 1 - 6, 2 - 6, 3 - 6, 4 - 6. If there is no continuity between the pins, the EV coil is faulty.
5. If the continuity is confirmed in step 3, the outdoor unit PCB is faulty.
Harness 5P
S20
(5)
6P Connector
1 2 3 4 5 6
Check
1 - 6
2 - 6
3 - 6
4 - 6
(R16386)
99 Service Diagnosis
SiBE041434E
5.5
Four Way Valve Performance Check
Check No.13
Turn off the power. Then, turn on the power to restart the system.
Start heating operation.
∗ Four way valve coil
Cooling / Dry: Not energized
Heating: Energized
S80 voltage at 220 - 240
VAC with compressor on? (Fig. 1)
YES
Disconnect the four way valve coil from the connector and check the continuity.
NO
Four way valve coil resistance at
1000 ~ 2000
Ω?
YES
NO
(Fig. 1)
Voltage at S80
220 - 240 VAC
Check
Replace the outdoor unit
PCB (main PCB).
Replace the four way valve coil.
Replace the four way valve.
(R21439)
Time
Compressor
ON
5.6
Inverter Unit Refrigerant System Check
Check No.14
Refrigerant system check
Is the discharge pipe thermistor disconnected from the holder?
YES
NO
Check for refrigerant leakage.
See the service diagnosis on refrigerant shortage (U0).
(R11904)
Reconnect the thermistor.
Replace the refrigerant.
(R15833)
Service Diagnosis 100
Check SiBE041434E
5.7
Inverter Analyzer Check
Check No.15
Characteristics
Inverter analyzer: RSUK0917C
If an abnormal stop occurs due to compressor startup failure or overcurrent output when using an inverter unit, it is difficult to judge whether the stop is caused by the compressor failure or some other failure (main PCB, power module, etc.). The inverter analyzer makes it possible to judge the cause of trouble easily and securely. (Connect an inverter analyzer as a quasicompressor instead of compressor and check the output of the inverter.)
Operation Method
Step 1
Be sure to turn the power off.
Step 2
Install an inverter analyzer instead of a compressor.
Note:
Make sure the charged voltage of the built-in smoothing electrolytic capacitor drops to 10
VDC or below before carrying out the service work.
(1) Remove the terminals from the compressor.
(2) Connect the terminals to the terminals of the inverter analyzer.
101
Compressor
Inverter analyzer
Be careful not to let the terminals (U,V,W) touch each other. Otherwise, high voltage is applied.
(R18322)
Reference:
If the terminals of the compressor are not FASTON terminals (difficult to remove the wire on the terminals), it is possible to connect wires available on site to the outdoor unit from output side of PCB. (Do not connect them to the compressor at the same time, otherwise it may result in incorrect detection.)
Step 3
Activate power transistor test operation from the indoor unit.
(1) Turn the power on.
(2) Select FAN operation with the Mode button on the remote controller.
(3) Press the center of the Temp button and the Mode button at the same time.
(4) Select
T
with the Temp or Temp button.
(5) Press the Mode button to start the power transistor test operation.
Service Diagnosis
SiBE041434E Check
Diagnose method (Diagnose according to 6 LEDs lighting status.)
(1) If all the LEDs are lit uniformly, the compressor is defective.
→ Replace the compressor.
(2) If the LEDs are not lit uniformly, check the power module.
→ Refer to Check No.22.
(3) If NG in Check No.22, replace the power module.
(Replace the main PCB. The power module is united with the main PCB.)
If OK in Check No.22, check if there is any solder cracking on the PCB.
(4) If any solder cracking is found, replace the PCB or repair the soldered section.
If there is no solder cracking, replace the PCB.
Caution
(1) When the output frequency is low, the LEDs blink slowly. As the output frequency increases, the LEDs blink quicker. (The LEDs look like they are lit.)
(2) On completion of the inverter analyzer diagnosis, be sure to re-crimp the FASTON terminals.
Otherwise, the terminals may be burned due to loosening.
Direction of crimp
This size is shortened by the crimp.
FASTON terminal
(R19646)
5.8
Rotation Pulse Check on the Outdoor Unit PCB
Check No.16
20/25/35 class
1. Check that the control voltage between the pins 10 - 11 is 15 VDC.
2. Check if the Hall IC generates the rotation pulse (0 ~ 15 VDC) 4 times between the pins 10 -
12, 10 - 13, when the fan motor is manually rotated once.
S70
HV (Hall IC)
HU (Hall IC)
Control voltage 15 VDC
3
2
5
4
1
7
6
9
8
13
12
11
10
Free pin
Free pin
Free pin
Free pin
Free pin
Free pin
Phase W
Phase V
Phase U
(R19957)
Service Diagnosis 102
Check SiBE041434E
42/50 class
Make sure that the voltage of 320 ± 30 V is applied.
1. Set operation off and power off. Disconnect the connector S70.
2. Check that the voltage between the pins 4 - 7 is 320 VDC.
3. Check that the control voltage between the pins 3 - 4 is 15 VDC.
4. Check that the rotation command voltage between the pins 2 - 4 is 0 ~ 6.5 VDC.
5. Keep operation off and power off. Connect the connector S70.
6. Check whether 4 rotation pulses (0 ~ 15 VDC) are input at the pins 1 - 4 when the fan motor is rotated 1 turn by hand.
When the fuse is melted, check the outdoor fan motor for proper function.
If NG in step 2
→ Defective PCB → Replace the outdoor unit PCB (main PCB).
If NG in step 4
→ Defective Hall IC → Replace the outdoor fan motor.
If OK in both steps 2 and 4
→ Replace the outdoor unit PCB (main PCB).
PCB
S70
3
4
5
6
7
1
2
Actual rotation pulse input (0 ~ 15 VDC)
Rotation command voltage (0 ~ 6.5 VDC)
Control voltage 15 VDC
320 VDC
(R19655)
5.9
Installation Condition Check
Check No.17
Installation condition check
Check the allowable dimensions of the air suction and discharge area.
OK
Is the discharged air short-circuited?
NO
Is the outdoor heat exchanger very dirty?
NO
NG
YES
YES
Is the airflow blocked by obstacles or winds blowing in the opposite direction?
YES
NO
Change the installation location or direction.
Change the installation location or direction.
Clean the outdoor heat exchanger.
Check the outdoor temperature. (The outdoor temperature should be within the operation range.)
Change the installation location or direction.
(R19401)
103 Service Diagnosis
SiBE041434E
5.10 Discharge Pressure Check
Check No.18
Discharge pressure check
Check
High?
YES
Is the stop valve open?
YES
Is the connection pipe deformed?
NO
Is the air filter or indoor / outdoor heat exchanger dirty?
YES
NO
NO
YES
NO
Replace the compressor.
Open the stop valve.
Replace the pipe installed at the site.
Replace the compressor.
Clean the dirty air filter or indoor / outdoor heat exchanger.
(R19385)
5.11 Outdoor Fan System Check
Check No.19
DC motor
Check the outdoor fan system.
Is the outdoor fan running?
YES
Outdoor fan system is functioning.
NO
Fan motor lead wire connector disconnected?
YES
Reconnect the connector.
NO
Go to Check No. 16.
(R21195)
Service Diagnosis 104
Check SiBE041434E
5.12 Main Circuit Short Check
Check No.20
Check to make sure that the voltage between (+) and (–) of the diode bridge (DB1) is approximately 0 V before checking.
Measure the resistance between the pins of the DB1 referring to the table below.
If the resistance is
∞
or less than 1 k
Ω, short circuit occurs on the main circuit.
Positive terminal (+) of digital multimeter
~
(2, 3)
+
(4)
~
(2, 3)
–
(1)
Negative terminal (–) of digital multimeter
Resistance is OK.
Resistance is NG.
+
(4)
~
(2, 3)
–
(1) several k
Ω ~ several MΩ
0
Ω or
∞
~
(2, 3)
20/25/35 class
3
4
1
2
+
–
Multimeter
(R19933)
42/50 class
Multimeter
+
–
4
3
2
1
105
(R21203)
Service Diagnosis
SiBE041434E Check
5.13 Power Module Check
Check No.22
Check to make sure that the voltage between (+) and (–) of the power module is approximately 0 V before checking.
Disconnect the compressor harness connector from the outdoor unit PCB. To disengage the connector, press the protrusion on the connector.
Follow the procedure below to measure resistance between the (+) or (–) terminal of the power module and the U, V, or W terminal of the compressor with a multimeter. Evaluate the measurement results referring to the following table.
Positive terminal (+) of digital multimeter
Negative terminal (–) of digital multimeter
Resistance is OK.
Resistance is NG.
Power module
(+)
UVW
UVW Power module
(–)
Power module
(+)
UVW
several k
Ω ~ several MΩ
0
Ω or ∞
UVW
Power module
(–)
20/25/35 class
V
U
DC +
Power module (+)
DC –
Power module (–)
W
(R20794)
Service Diagnosis 106
Check
42/50 class
SiBE041434E
DC_N1
Power module (–)
W
V
U
DC_P1
Power module (+)
(R21204)
107 Service Diagnosis
SiBE041434E
Part 7
Trial Operation and
Field Settings
1. Pump Down Operation........................................................................109
2. Forced Cooling Operation ...................................................................110
When 2 Units are installed in 1 Room ..................................................112
Model Type Setting ..............................................................................112
Facility Setting (cooling at low outdoor temperature) ...........................113
5. Silicon Grease on Power Transistor / Diode Bridge ............................115
Trial Operation and Field Settings 108
Pump Down Operation SiBE041434E
1. Pump Down Operation
Outline
In order to protect the environment, be sure to conduct pump down operation when relocating or disposing of the unit.
Detail
1) Remove the valve caps from the liquid stop valve and the gas stop valve.
2) Carry out forced cooling operation.
3) After 5 to 10 minutes, close the liquid stop valve with a hexagonal wrench.
4) After 2 to 3 minutes, close the gas stop valve and stop the forced cooling operation.
Hexagonal wrench
Close
Liquid stop valve
Gas stop valve
Service port
Refer to forced cooling operation on Page 110.
Valve cap
(R13628)
109 Trial Operation and Field Settings
SiBE041434E Forced Cooling Operation
2. Forced Cooling Operation
Item
Conditions
Start
Command frequency
End
Others
Forced Cooling
The forced cooling operation is allowed when both of the following conditions are met.
1) The outdoor unit is not abnormal and not in the 3-minute standby mode.
2) The outdoor unit is not operating.
Press the forced cooling operation ON/OFF button (S1W) on the indoor unit for 5 seconds.
20/25/35 class: 58 Hz
42/50 class: 30 Hz
The forced cooling operation ends when any of the following conditions are fulfilled.
1) The operation ends automatically after 15 minutes.
2) Press the forced cooling operation ON/OFF button (S1W) on the indoor unit again.
3) Press the On/Off button on the remote controller.
Protection functions have priority over all other functions during forced cooling operation.
Indoor Unit: 20/25 class
Indoor Unit: 35/42/50 class
ON/OFF button (SW1)
(R21339)
ON/OFF button (SW1)
(R21340)
Trial Operation and Field Settings 110
Trial Operation SiBE041434E
3. Trial Operation
Outline
Carry out the trial operation in accordance with the operation manual to ensure that all functions and parts, such as flap movement, are working properly.
Trial operation should be carried out in either cooling or heating operation.
Detail
1. Measure the power supply voltage and make sure that it falls within the specified range.
2. In cooling operation, select the lowest programmable temperature (18°C); in heating operation, select the highest programmable temperature (30°C).
Trial operation may be disabled in either operation mode depending on the room
temperature.
After trial operation is complete, set the temperature to a normal level (26°C ~ 28°C in cooling, 20°C ~ 24°C in heating operation).
For protection, the system does not start for 3 minutes after it is turned off.
ARC466 Series
(1) Press the On/Off button to turn on the system.
(2) Press the center of the Temp button and the Mode button at the same time.
(3) Select
T
(trial operation) with the Temp or Temp button.
(4) Press the Mode button to start the trial operation.
(5) Press the Mode button and select operation mode.
(6) Trial operation terminates in approximately 30 minutes and switches into normal mode. To quit trial operation, press the On/Off button.
(2) (4) (5)
(3)
(2) (3)
(1) (6)
(R19935)
111 Trial Operation and Field Settings
SiBE041434E Field Settings
4. Field Settings
4.1
When 2 Units are installed in 1 Room
Outline
When 2 indoor units are installed in 1 room, 1 of the 2 indoor units and the corresponding wireless remote controller can be set for different addresses.
Both the indoor unit PCB and the wireless remote controller need alteration.
Indoor Unit PCB
Cut the address setting jumper JA on the control PCB.
20/25 class
35/42/50 class
ADDRESS
JA
JA ADDRESS
EXIST 1
CUT 2
JA
EXIST
CUT
ADDRESS
1
2
(R18258)
(R18414)
Caution Replace the PCB if you accidentally cut a wrong jumper.
Jumpers are necessary for electronic circuit. Improper operation may occur if you cut any of them.
Wireless Remote
Controller
Cut the address setting jumper.
Jumper
ADDRESS
EXIST 1
CUT 2
∗ Do not cut the left jumper.
(R18416)
Caution Replace the remote controller if you cut the jumper on the left side.
The heating operation will not be available when the jumper on the left side is cut.
4.2
Model Type Setting
This remote controller is common to the heat pump model and cooling only model.
Never cut this jumper.
Caution Replace the remote controller if you cut the jumper on the left side.
The heating operation will not be available when the jumper on the left side is cut.
(R18451)
Trial Operation and Field Settings 112
Field Settings SiBE041434E
4.3
Facility Setting (cooling at low outdoor temperature)
Outline
This function is limited only for facilities (the target of air conditioning is equipment (such as computer)). Never use it in a residence or office (the space where there is a human).
Detail
You can expand the operation range to –15°C by cutting the jumper on the outdoor unit PCB.
Note that the operation may stop if the outdoor temperature drops below –15°C. If the outdoor temperature rises, the operation starts again.
20/25/35 class
Main PCB
Cut the jumper J4.
S40
S90
S2
(R18253)
42/50 class
Cut the jumper J6.
(R21209)
Caution Replace the PCB if you accidentally cut a wrong jumper.
Jumpers are necessary for electronic circuit. Improper operation may occur if you cut any of them.
Caution
1. If the outdoor unit is installed where the outdoor heat exchanger of the unit is exposed to direct wind, provide a windbreak wall.
2. Intermittent noises may be produced by the indoor unit due to the outdoor fan turning on and off when using facility settings.
3. Do not place humidifiers or other items which might raise the humidity in rooms where facility settings are being used.
A humidifier might cause dew condensation from the indoor unit outlet vent.
4. Cutting the jumper sets the indoor fan tap to the highest position.
113 Trial Operation and Field Settings
SiBE041434E Field Settings
4.4
Jumper Settings
Indoor Unit
Function
Fan speed setting when compressor stops for thermostat OFF. (effective only in cooling operation)
Power failure recovery function
Jumper
JB
When connected
(factory setting)
Fan speed setting ;
Remote controller setting
JC Auto-restart
When cut
The fan stops.
The unit does not resume operation after recovering from a power failure. Timer settings are cleared.
For the location of the jumper, refer to page 8, 10.
Outdoor Unit
Function Jumper
Improvement of defrost performance
20/25/35 class
→ J5
42/50 class
→ J8
When connected
(factory setting)
Standard control
When cut
Reinforced control (Ex: The frequency increases, the duration time of defrost lengthens.)
For the location of the jumper, refer to page
.
Caution Replace the PCB if you accidentally cut a wrong jumper.
Jumpers are necessary for electronic circuit. Improper operation may occur if you cut any of them.
Trial Operation and Field Settings 114
Silicon Grease on Power Transistor / Diode Bridge SiBE041434E
5. Silicon Grease on Power Transistor / Diode
Bridge
Outline
Apply the specified silicon grease to the heat radiation part of a power transistor / diode bridge when you replace an outdoor unit PCB. The silicon grease encourages the heat radiation of a power transistor / diode bridge.
Detail
1. Wipe off the old silicon grease completely.
2. Apply the silicon grease evenly. See the illustrations below for examples of application.
3. Tighten the screws of the power transistor / diode bridge.
4. Make sure that the heat radiation parts are firmly contacted to the radiation fin.
Note: Smoke emission may be caused by bad heat radiation when the silicon grease is not appropriately applied.
OK: Evenly applied
Power transistor
(or diode bridge)
PCB
Radiation fin
Silicon grease
(R18015)
NG: Not evenly applied
(R18016)
NG: Foreign matter is stuck.
115
Foreign matter (R18017)
Trial Operation and Field Settings
SiBE041434E
Part 8
Appendix
Appendix 116
Piping Diagrams
1. Piping Diagrams
1.1
Indoor Unit
FTXM20/25K3V1B
Indoor unit
7.0 CuT
Heat exchanger
4.8 CuT
Field piping
(6.4 CuT)
Field piping
(9.5 CuT)
Thermistor (heat exchanger)
Crossflow fan
M
Fan motor
9.5 CuT
7.0 CuT
7.0 CuT
Refrigerant flow
Cooling
Heating
4D092170
FTXM35K3V1B
6.4 CuT
Indoor unit
Heat exchanger
Field piping
(6.4 CuT)
Field piping
(9.5 CuT)
Crossflow fan
M
Fan motor
9.5 CuT
Thermistor (heat exchanger)
Refrigerant flow
Cooling
Heating
4D092169
117
SiBE041434E
Appendix
SiBE041434E
FTXM42/50K3V1B
6.4 CuT
Indoor unit
Heat exchanger
Field piping
(6.4 CuT)
Field piping
(12.7 CuT)
Crossflow fan
M
Fan motor
9.5 CuT
Thermistor (heat exchanger)
Refrigerant flow
Cooling
Heating
4D092168
Piping Diagrams
Appendix 118
Piping Diagrams
1.2
Outdoor Unit
RXM20/25/35LV1B
7.0 CuT
7.0 CuT
Outdoor unit
Heat exchanger
Outdoor air temperature thermistor
Heat exchanger thermistor
4.8 CuT
Muffler with filter
6.4 CuT 6.4 CuT
4.8 CuT
Electronic expansion valve
EV
Muffler with filter
M
Propeller fan
9.5 CuT
Muffler with filter
4-way valve
ON: heating
Muffler
Discharge pipe thermistor
Compressor
9.5 CuT
Accumulator
Liquid stop valve
Muffler
Muffler
9.5 CuT
Gas stop valve with service port
Field piping
(6.4 CuT)
Field piping
(9.5 CuT)
Refrigerant flow
Cooling
Heating
SiBE041434E
3D092005
RXM42/50LV1B
Outdoor unit
Heat exchanger
7.9 CuT
7.9 CuT
7.9 CuT
7.9 CuT
7.9 CuT
7.9 CuT
7.9 CuT
7.9 CuT
7.9 CuT 4.0 CuT
7.9 CuT 4.0 CuT
Heat exchanger thermistor
M
4.0 CuT
4.0 CuT
Outdoor air temperature thermistor
1
2
3
4
1-4Capillary tube
Muffler with filter
Propeller fan
12.7 CuT
EV 6.4 CuT 6.4 CuT
Electronic expansion valve
Filter
4-way valve
ON: heating
Muffler
Receiver gas
6.4 CuT
Liquid stop valve
Field piping
(6.4 CuT)
Muffler
Discharge pipe thermistor
Compressor
9.5 CuT
Accumulator
Muffler
9.5 CuT 9.5 CuT
12.7 CuT
Muffler
Gas stop valve with service port
Field piping
(12.7 CuT)
Refrigerant flow
Cooling
Heating
3D092010
119 Appendix
SiBE041434E
2. Wiring Diagrams
2.1
Indoor Unit
FTXM20/25K3V1B
PCB2
LED1
LED2
LED3
S1W t˚
R1T
H1P
H2P
H3P
S27
1
10
BLK
BLK
BLK
BLK
BLK
BLK
BLK
BLK
BLK
BLK
S26
1
10
S25
1 3
S32
1 2
S6
1
Transmission circuit
C101 C103
C102 C104
5
S200
1
V1
PCB1
MR10
9 12
S403
1
FG2
FG1
H3
H2
H1
Z1C
GRN/YLW
GRN
GRN
N=3
RED 3
WHT 2
BLK 1
X1M
3
2
1
Outdoor
SR
A
IPM200
6
F1U
3.15A
7 10
Indoor
Colours
BLK
WHT
BRN
RED
GRN
YLW
ORG
BLU
: Black
: White
: Brown
: Red
: Green
: Yellow
: Orange
: Blue
WRC
Z2C
N=2
S36
1 3
IES t˚
M
M1S
M
M1F
S602
6 1 4 1
S601
R2T
PCB3
S21
OPTION
PCB4
Field wiring
WRC
PCB1-PCB4
IPM200
S6-S602
S1W
FG1, FG2
F1U
H1-H3
H1P-H3P
M1F
M1S
: Rectifier
: Protective earth
: Wireless remote control
: Printed circuit board
: Intelligent power module
: Connector
: Operation switch
: Frame ground
: Fuse
: Harness
: Pilot lamp
: Fan motor
: Swing motor
X1M
MR10
V1
R1T, R2T
C101-C104
SR
IES
Z1C, Z2C
Notes
: Terminal strip
: Magnetic relay
: Varistor
: Thermistor
: Capacitor
: Signal receiver
: Intelligent Eye sensor
: Ferrite core
: The connection of ·PCB4 ·is optional.
Caution
When the main power is turned off and then back on again, operation will resume automatically.
FTXM35/42/50K3V1B
PCB3
LED1
LED2
LED3
H1P t˚
H2P
H3P
RTH1
R1T
S49
1
BZ
S1W
9
BLK
BLK
BLK
BLK
BLK
BLK
BLK
BLK
BLK
S46
1
9
A
Transmission circuit
C101
C102
V1
PCB1
MR10
F1U
3.15A
FG
H3
H2
H1
S21
S47
1 3
BLK BLK BLK
S25
1
4
S32
1 2
S48
1
SR
3
PCB2
S26
1
IES
4
PCB4 t˚
R2T
S41
16
8
10 12 14 2 5 3 4 6 1513 11 9 7 1
MSW
M1S
MSW
M2S
MSW
M3S
S1
1 4
MS
3~
M1F
7
WRC
Field wiring
GRN/YLW
GRN
RED
WHT
BLK
3
2
1
X1M
Indoor
WRC
PCB1-PCB4
BZ
S1-S49
S1W
FG
F1U
H1-H3
H1P-H3P
M1F
M1S-M3S
: Rectifier
: Protective earth
: Wireless remote control
: Printed circuit board
: Buzzer
: Connector
: Operation switch
: Frame ground
: Fuse
: Harness
: Pilot lamp
: Fan motor
: Swing motor
X1M
MR10
V1
R1T, R2T
C101, C102
SR
IES
: Terminal strip
: Magnetic relay
: Varistor
: Thermistor
: Capacitor
: Signal receiver
: Intelligent Eye sensor
Caution
When the main power is turned off and then back on again, operation will resume automatically.
3
2
1
Outdoor
Colours
BLK
WHT
BRN
RED
GRN
YLW
ORG
BLU
PNK
: Black
: White
: Brown
: Red
: Green
: Yellow
: Orange
: Blue
: Pink
Wiring Diagrams
3D093446
3D093481
Appendix 120
Wiring Diagrams
2.2
Outdoor Unit
RXM20/25/35LV1B
SiBE041434E
Field wiring
Indoor
L
N
1
2
3
Outdoor
X1M
L
N
1
2
3
BLK
WHT
RED
N=2
Z3C
AC1
AC2
S
FU3
20A
V2
Z2C
N=2
E1
E2
Q1
Y1E
Y1S
SA1
IPM1,IPM2
Q1L
M1C
PCB1,PCB2,PCB3
M1F
X1M
Z1C,Z2C,Z3C
L
FU1,FU2,FU3
DB1,DB2,DB3
L1
L1R
C5,C6,C119
R1T,R2T,R3T
N
: Insulated Gate Bipolar Transistor(IGBT)
: Electronic expansion valve coil
: Reversing solenoid valve coil
: Surge arrestor
: Intelligent power module
: Overload protector
: Compressor motor
: Printed circuit board
: Fan motor
: Terminal strip
: Ferrite core
: Live
: Fuse
: Diode bridge
: Coil
: Reactor
: Capacitor
: Thermistor
: Neutral
V3
SA1
L1
MR30
PCB1
MRM20
HR1
L1R
BRN
MRM10
FU1
3.15A
S11
1
9
HN2
HL2
WHT
BLK
BLK
BLK
BLK
BLK
BLK
BLK
BLK
BLU
ORG
HL3
HN3
V1
1
S10
9
WHT
HR2
HA1
GRY
HA2
DB1
~
~
+
–
MRCW
1
S100
2
1
S20
6 3
S80
1
S110
PCB3
M
Y1E
X11A,X12A,X13A,HA1,HL2,HR2
E1,E2,AC1,AC2,S,HR1,HN2
MRCW,MR30,MRM10,MRM20
S10,S11,S20,S40,S70,S80,S90
S100,S110,HL3,HN3
V1,V2,V3
X13A
Y1S
: Connection
: Magnetic relay
: Connector
: Varistor
: Protective earth
DB2
~
~
X12A
+
–
~ +
~
–
DB3
1
Q1
S90
6
C5
C6
+
–
+
–
C119
PCB2
S40
2 1
R1T R2T R3T
Outdoor
Discharge
Condenser
Q1L
+
–
FU2
3.15A
+
IPM2
–
S70
1 4 7 10 11 12 13
BLK
WHT
BRN
RED
GRN
YLW
ORG
BLU
GRY
: Black
: White
: Brown
: Red
: Green
: Yellow
: Orange
: Blue
: Grey
MS
3~
M1F
Z1C
N=4
+
–
IPM1
W V U
W
V
MS
3~
M1C
U
X11A
3D090516
RXM42/50LV1B
Indoor
1
2
3
Field wiring
X1M
L
N
1
2
3
BLK
WHT
RED
Z3C
N=5
HL1
FU3
30A
HN1
S
V2
L
N
E1
SA1
V3
ZF
Z2C
N=4
E2
PS
Y1E
Y1S
SA1
IPM1
Q1L
M1C
PCB1
M1F
X1M
Z1C, Z2C, Z3C
L
FU1, FU2, FU3
DB1
N
C7
R1T, R2T, R3T
PAM
: Switching power supply
: Electronic expansion valve coil
: Reversing solenoid valve coil
: Surge arrestor
: Intelligent power module
: Overload protector
: Compressor motor
: Printed circuit board
: Fan motor
: Terminal strip
: Ferrite core
: Live
: Fuse
: Diode bridge
: Neutral
: Capacitor
: Thermistor
: Pulse-amplitude modulation
MRM10
MRM20
MR30
FU1
3.15A
V1
DB1
~
+
~
PAM
PS
+
C7
FU2
3.15A
+
IPM1
PCB1 W V U
Outdoor
1
S20
6
S40
1 2 1
S80
3
MRCW
1
S90
6 1
S70
4 7
Z1C
N=4
ORG BRN t˚ t˚ t˚
Y1S
M
Y1E
Q1L
R1T R2T R3T
Outdoor Discharge
Condenser
X11A, HL1, HN1, E1, E2, S
MRCW, MR30, MRM10, MRM20
S20, S40, S70, S80, S90
V1, V2, V3
ZF
: Connection
: Magnetic relay
: Connector
: Varistor
: Noise filter
: Protective earth
MS
3
~
M1F
BLK
WHT
BRN
RED
GRN
YLW
ORG
BLU
: Black
: White
: Brown
: Red
: Green
: Yellow
: Orange
: Blue
W
V
MS
3
~
U
M1C
X11A
3D090522
121 Appendix
Revision History
Month / Year
02 / 2015
Version
SiBE041434E First edition
Revised contents
Warning
z
Daikin products are manufactured for export to numerous countries throughout the world. Prior to purchase, please confirm with your local authorised importer, distributor and/or retailer whether this product conforms to the applicable standards, and is suitable for use, in the region where the product will be used. This statement does not purport to exclude, restrict or modify the application of any local legislation.
z
Ask a qualified installer or contractor to install this product. Do not try to install the product yourself.
Improper installation can result in water or refrigerant leakage, electrical shock, fire or explosion.
z
Use only those parts and accessories supplied or specified by Daikin. Ask a qualified installer or contractor to install those parts and accessories. Use of unauthorised parts and accessories or improper installation of parts and accessories can result in water or refrigerant leakage, electrical shock, fire or explosion.
z
Read the user's manual carefully before using this product. The user's manual provides important safety instructions and warnings. Be sure to follow these instructions and warnings.
If you have any enquiries, please contact your local importer, distributor and/or retailer.
Cautions on product corrosion
1. Air conditioners should not be installed in areas where corrosive gases, such as acid gas or alkaline gas, are produced.
2. If the outdoor unit is to be installed close to the sea shore, direct exposure to the sea breeze should be avoided. If you need to install the outdoor unit close to the sea shore, contact your local distributor.
Dealer
Head Office:
Umeda Center Bldg., 2-4-12, Nakazaki-Nishi,
Kita-ku, Osaka, 530-8323 Japan
Tokyo Office:
JR Shinagawa East Bldg., 2-18-1, Konan,
Minato-ku, Tokyo, 108-0075 Japan http://www.daikin.com/products/ac/ c All rights reserved z
Specifications, designs and other content appearing in this brochure are current as of February 2015 but subject to change without notice.
SiBE041434E
02/2015 AK.B
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Key Features
- Inverter technology
- Wall mounted installation
- Multiple operating modes
- Timer
- Remote control
- Energy efficiency
- Comfortable airflow
- Quiet operation
- Self-diagnosis
- Air-purifying filter