Inverter Training

Inverter 　
Training
Service Training Program
Field Failure Example of Past Models

AWY14L Features
Heating capacity decrease at low ambient temperature
Block Diagram
Temperature difference of ON/OFF control
Starting Current Circuit description/Power supply flow chart
Additional feature explanation
Air Conditioner Inverter Composition Indoor unit Micon control (assorted)
Outdoor unit Micon control (assorted)
Inverter Module Composition Error information
Memory function of Error
What is Inverter ? Trouble shooting
Principle of rotation control 　
Inverter control system
ASY12L Features
Block Diagram
Power supply flow chart
Circuit description
Indoor unit Micon control (assorted)
Outdoor unit Micon control (assorted)
Error Information
Memory function of Error
Trouble shooting
 Fujitsu 　 GENERAL 　 Customer 　 Service 　

The comfortable improvement
The mainly purpose of air-conditioner is to offers the comfortable feeling to the
residence air space, but there’re still some basical problem left in the conventional
heat pump air-conditioner.
However ,by using the inverter, those problem can be solved.
Problems in the conventional model

Problem 1
Unit’s heating capacity decrease in low temperature condition.
Problem 2
Require long period of time to reach set temperature.
Problem 3
Room temperature drop rapidly when the compressor turn OFF which result in
the wide range of changed temperature that can be sensed by human body and
may cause unpleasant feeling. Heating operation

Problem 1
Unit’s heating capacity decrease in low temperature condition.
Low temperature condition Common model Inverter Model

Capacity when outdoor temp.
= 7 degC 8000W 8000W
Capacity when outdoor temp.

= 0 degC 7000W 8000W
Improved by the inverter
Raise the capacity by increase the revolution of compressor.

Problem 2
Require long period of time to reach set temperature. (About 40 minutes)
Conventional Model Inverter

Set temperature Set temperature
Room temperature (deg.)

Revolution of COMPRESSOR Revolution of COMPRESSOR
40 min. Time 20 min. Time

*Comparison with our 24000BTU Model
By spinning compressor motor at high revolution since start

condition will shorten the room temperature rise-time from the
common model. (About 20 minutes)
Problem 3
Room temperature drop rapidly when the compressor turn OFF
which result in the wide range of changed temperature that can be
sensed by human body and may cause unpleasant feeling.
Conventional Model Inverter
Set temperature Set temperature
3 deg.

1 deg.
Revolution of COMPRESSOR
ON ON ON
OFF OFF Revolution of COMPRESSOR
Time Time
The range of changed room temperature is small. Because after reached

the set temp,compressor will not OFF to control the temperature.
But will maintain temperature by decreasing or increasing the revolution.
Other characteristics
-Low compressor starting current.
Conventional model Inverter model

Require large starting current Require just small starting current that
results in increase its ability to starting
from low compressor revolution.

Inverter part composition outline
AC Indoor unit control

Thermistor
Remote control
Fan motor
Indicator
Diode bridge Active Filter Module
Capacitor
Indoor unit IPM

Main circuit control
Thermistor
4way valve
Fan motor
Compressor
Outdoor unit
CONTROL MODULE’S COMPOSITION OUTLINE
Single Phase current The fixed direct The variable voltage

current voltage Variable frequency
Integrated power
Module (AFM)
b
Module (IPM)
Diode Bridge
Active filter
d
AC Coil
Power supply Motor
Capacitor
c
a e
CONTROL CIRCUITE (MICRO PROSSSOR)

CONVERTER POWER FACTOR
IMPROVING CIRCUITE INVERTER
a) The minus electric potential is changed to the plus electric potential by using Diode Bridge which is connected to AC power supply
(Full-wave rectification).
b) The coil keeps the constant variation of the current and removes the pulsation of the rectified DC current.
c) Active Filter Module suppresses the high frequency harmonic wave that is occurred during the rectification and
improves the power factor.
d) By using the smoothing capacitor, the output voltage from the active filter module is converted to the stable DC
voltage.
e) At IPM, the circuit which compose of 6 transistors switches the output voltage from the active filter module, and the
supply voltage to the motor is varied by either PWM control or PAM control.
What’s Inverter ?
Inverter and Converter
Converter Device to convert alternating current to direct current.
Inverter Device to convert direct current to alternating current
In general term, We call Inverter for device that converts normal alternating current
from home / industrial-used power supply to voltage / frequency adaptable from
alternating current.
Outline principle of inverter
1. Rectifying the alternating current and flattening the output to derive direct
current power supply.
2. Using the electrical equipment such as the semi-conductor to do switching
and chopping those derived direct current to make the alternating current at
required frequency and voltage.
Advantages of the inverter air-conditioner
Energy saving
- Comparing to the common ON - OFF controlled compressor, the inverter
controlled compressor can be able to run at the proper revolution to provide
the best efficiency and reduce losses.
- When the maximum capacity is not required, the compressor revolution will
decrease. These means the input power decrease too, which result in the
increasing of unit’s efficiency.

Basic Circuit of 3 Phase Inverter
When the switches SW1 through SW6 are turned ON and OFF in order of the figure,
the equal interval pulse wave is obtained between U-V, V-W and W-U, and the pulse wave
3 phase AC voltage is appeared on the motor.
time P
ON
S1 OFF
++
S2
S1 S3 S5
S3 MOTOR
U
U
S4
S5
S6
N S4 S6 S2 V
V W
U–V
--
V–W
By changing the ON-OFF cycle of the switch, the
rotation of the motor can be varied at the desired
W–U frequency. If the DC voltage is changed, the input
voltage of the motor can be also varied.
Practically, the motor is rotated by using 6pcs
of transistors instead of a switch, and the transistor
is alternately turned ON-OFF.
Type of Inverter Control System
AC Inverter
PWM Control System
The motor needs a sign wave input. The pulse width of the DC
voltage from the converter is varied and cut out by the switching at
the inverter as shown in the figure, and the motor rotation is
controlled by the quasi-sign wave that is created by varying it to the
desired average voltage.
DC Inverter
PWM Control System
By using a brush less motor, the DC voltage pulse width from
the converter is varied and cut out by the switching of the
inverter, and the DC motor rotation is controlled by varying it to
the desired average voltage It differs from AC compressor and
the pulse becomes the equal interval waveform
PAM Control System

By using a brush less motor, the motor rotation is controlled by
applying a variable voltage of DC140V through 390V to the
motor winding directly with the voltage booster which is
composed of a reactor and a switching component.
ASY12LSAC / AOY12LSAC
Major feature of the product
WALL 　 Mounted 　 Single 　 Inverter
Energy saving DC Inverter (R410A) PWM system
E-Chassis (Front folding door)
Refrigerant used : R410A
Compressor
　　　　　 Hermetic type,4 pole,
　　　　　　　　 3 phase , DC brush 　 les motor 　
Built-in Outdoor Unit Active Filter Module
Compact 　 Remote 　 control
COIL 　 DRY 　 Operation
No additional charging required up to 15m.

Indoor unit control PCB

　　　 Thermistor Indicator PCB
Room temperature Serial Signal circuit
Pipe temperature
Louver
Power Supply circuit DC 15V Input
Motor
Micro processor
Buzzer Indoor FAN

Indoor unit motor DC 12V Input
DC 5V Input
Diode bridge PWB

Thermistor Outdoor unit control
Discharge temperature PCB Active Filter Module
Outdoor temperature
Pipe temperature Capacitor
Power Supply circuit
IPM Module AC 230V ON / OFF Control
Serial Signal circuit 4 Way Valve
Micro processor E EV Valve

Compressor
LED Outdoor
Outdoor unit Fan
Motor

Circuit Diagram ASY12LSAC Pdf file
Circuit Description of ASY12LSAC / AOY12LSAC
Power Supply Circuit

Varistor
When an abnormal voltage is applied between the terminal of varistor (VA101),
it shorts out and the circuit protection is carried out.
Surge Absorber
The surge absorber is a protection part as same as varistor for the
electronic parts of outdoor unit against abnormal voltage such as
lightening and it discharges the lightening surge.
Noise Filter
A lot of different kinds of pulse noise come out of inverter since it
Controls transistors by switching. Noise filter protects these noises
to come out of inverter by absorbing the noise with the coil and
bypassing the high harmonic frequency with capacitor.
Coil
It improves the primary side commercial power supply wave form
(power factor) by removing the power supply harmonic frequency
current and performs the insulation protection.
Current Detection Circuit

It is the circuit which always detects the input current. The compared
value to 5 V standard voltage is input to the micon and detects CT
error so that the supplied current to the circuit does not exceed the set
up value.
(Total current value decrease of the outdoor unit is detected during the
compressor operation.)
Diode Bridge
It conducts the full-wave rectification of the AC voltage that passed
through the power factor improvement filter.
Active Filter Module
The input current is corrected by the micon inside the module and the boosting
chopper circuit, and the waveform with 100% of power factor is supplied to the
output.
It improves the power factor, and controls the power supply harmonic wave current.
When compressor is stopped = Input Voltage x Root 2 (Effective Value)

When compressor is operated = 380V
The target DC voltage is set up by the input voltage and multiplied in comparison with the input DC voltage.
The multiplied target current and the input current are compared.
The compared value is compacted at with the waveform the oscillator at PMW comparator.
The compared signal controls the switching component ON and OFF.
Smoothing capacitor
This is used to remove the ripple of DC voltage that is output from the
active filter.
Switching Transformer
By using the switching transformer, the DC input is transferred to the
driving power for input output hardware. And its output is fed into the
3 terminal regulator, and the output voltage is used to drive Micon or
for data comparison.
Oscillator for Micon

It creates the timing pulse and clock signal to input and output of t
he Micon.
Reset Circuit
It creates the power ON reset signal for Micon.
If noise comes into the input of IC, the Micon may not operate normally.
IPM (Integrated Power Module)

It is composed of 6 transistors and
drives the motor by high speed switching.
The drive voltage signal is transferred to
the drive circuit from Micon, and varies
the supply frequency to the motor
(PWM system) to rotate the motor.
Motor
DC Motor (DC Inverter)
The rotor of DC compressor motor is made of permanent magnet, and it creates the
revolving magnetic field by applying the voltage that is obtained by PAM control to
the stator winding. And the pull and repulsion between the rotating magnetic field
and the permanent magnet creates the force toward the same direction of the rotating
magnetic field, and the rotor rotates.
The rotor and the permanent magnet need to be controlled to match up the revolving
magnetic field to the polarity. In order to control the positioning detection, there are
several types. One is the sensor type that built in the rectifier or Hall Effect Device,
and the other type is the one that the positioning detection is done by the reverse
power force which is excited at the stator winding by the rotation (Fleming’s Right
Hand Rule).
The speed of the compressor can be changed by drifting the voltage (PAM control /
PWM control).
The rotor is made of permanent magnet.

No slipping is occurred and the efficiency is good.
When measuring the motor frequency by using a clamp meter,
the indication is 2time of actual rotation speed since it used
4 pole permanent magnet.
Motor
AC Motor
AC compressor motor is 3 phase induction motor. Revolving magnetic field is
occurred when the voltage that was obtained by PWM control is applied to the
stator winding. Then the induction current flow through the rotor and it rotates by
the force in the same direction of the revolving magnetic field, by Fleming’s Left
Hand Rule.
The rotation speed of the compressor can be changed with varying PWM
frequency. (Uneven interval PWM)
PWM controlled voltage is supplied in 3 phase AC by shifting 120 degree each.
The power to electromagnet the rotor is required additionally.

Due to the slipping (difference between the rotation speed and
magnetic rotation speed), the rotation loss is large.
Circuit Description of AOY9LSAC / AOY12LSAC
Serial Communication Circuit

In order to operate the outdoor unit based on the indoor unit’s operational conditions, each
control signal needs to be transferred from the indoor unit to the outdoor unit.
Since this control has many kinds of signals, it uses the serial signal transfer system that
transfers various control signals onto 1 set of transfer line.
Timing to send/receive signal is controlled by the serial signal that is synchronized to the power
supply frequency.
Serial signal control method
The serial signal is used for exchange the information between the indoor unit and
inverter unit during operating.
The contents of the information are showed in the TABLE1
Serial signal consists of 48bit [ INFORMATION 1 (Serial signal)] and
32bit [ INFORMATION 2 (serial reverse signal) ].
INFORMATION 1
Forward Serial signal
Indoor Unit Outdoor Unit
INFORMATION 2
Reverse Serial signal
Example of Serial Signal of ASY24PBA-W/AOY24PMAL
Outline of control by microcomputer
Indoor unit
Input Output
Micon control specifications
Manual auto button Operation mode control Out door unit power relay
Set temperature control
Fan control / /Swing control Stepping motor
Infrared lay signal Timer mode /Coil dry control
Manual auto operation
Outdoor unit power relay control Indoor unit FAN motor
Room temperature Indoor unit Fan control
Thermister Louver Stepping motor control
Room temperature revise LED
Heat exchanger temperature Power Relay ON/OFF control
Thermister Auto change over
Compressor driving frequency change Buzzer
Start circuit
Cooled air prevention
Over load protection Heating
Prevention of icing
Air flow direction control
Auto defrosting operation
Indoor FAN S-HI control
Indoor FAN lock prevention
Auto restart
Test run
3minutes ST
50/60Hz auto change
Microcomputer Control ASY12LSAC / AOY12LSAC
Coil Dry – Approx. 18 minutes
The following operation starts when Coil Dry button on the remote is pressed.
The cycle of [FAN operation for 3 minutes  HEATING operation for 2 minutes ] is repeated 3 times and at last
FAN operation is performed for 3 minutes.
　 Indoor Fan Motor is fixed at 900 rpm
Louver is horizontal
Only LED Coil Dry lights up (It turns off at the end of Coil Dry operation).
*** Coil Dry operation is quitted if the operation is stopped or by other operation input.
Power Relay ON/OFF control

If the operation mode is stopped on heating mode, the power relay is kept on for 48 hours from then.
Upon 48 hours, 48 hour timer is reset, and it is turned ON again.

When heating operation is started or selected from other operation mode, the indoor fan mode becomes S-HI
if the following condition is met.
Set up Temperature : 30 degC
Set up Airflow : Hi
Continuous Operation(Not Timer operation)
Indoor Temperature : Higher than 16 degC, lower than 24 degC
Indoor Fan lock prevention

Rotation error
If the fan motor speed is less than 1/3 of the target speed after 56 seconds of starting Fan operation or
selecting. Fan operation from other mode, the operation stops and Error is indicated.
LED :(:(Timer LED 0.1sec. flashing / Operation LED 0.5 sec. 6 times blinking )
Lock Error
If the fan motor speed is 0 rpm after 56 seconds of starting Fan operation or selecting Fan operation from
other mode, the operation stops and Error is indicated.
LED : (Timer LED 0.1sec. flashing / Operation LED 0.5 sec. 6 times blinking )
Outdoor unit
Input Output
OUT 　 DOOR 　 temperature 4way 　 valve
Thermister Micon control specifications Cooling : OFF
Heating: ON
Operation control Compressor Dry : OFF 　
DISCHARGE 　 TEMPERATURE
Operation control outdoor FAN motor
Thermister
EEV- valve control Compressor
Operation control Defrost
It corresponding to the rpm order
Heat 　 Exchanger 　 temperature Active filter control
of the Forward serial signal
Thermister 　 Over current protection of IPM
Electric current passing failure protection
High pressure passing ascent protection
DRIVE CURRENT FAN 　 motor (AC MOTOR)
CT abnormal detection
Power souse cut off instantaneously detection
Compressor location Error
IPM OVER LOAD CURRENT (IPM)
Compressor Preheating
3 minutes ST EEV valve
Pre heating Internalize
4way valve control (It is set to stipulated pulse of each
Serial 　 SIGNAL(Forward ）
Timer short operating.)
Thermister abnormal detection
Serial 　 SIGNAL(Reverse ）
LED
EEV Valve Control
Initialization
When power relay is ON, initial position is set up by the input of the pulse toward closing valve direction.
When the operation starts, initial setting pulse of each mode is reset and the opening of the valve can be controlled
by adding pulse.
VALVE control
On cooling / heating / dry operation mode, the opening amount of EEV is controlled to match up the actual exhaust
temp. thermistor value toward the targeted exhaust temp., by setting up the targeted exhaust temp. with the micon
control which inputs are indoor heat exchanger temperature, outdoor temperature and compressor speed.
Pre-heating
When the heating operation stops and the power relay is working, it will start in the detection of the heat exchanger
temperature. pure-heating is applies feeble electric current to the U and V terminals.
Active Filter Control

Active filter abnormal voltage detection
If DC voltage is detected over 425V or below 80V just before turning ON Active Filter; Compressor and outdoor fan
are stopped,by detecting error 3 times, permanent stop is conducted.
LED : (Timer LED 0.1sec. flash / Operation LED 0.5sec. 8 times blinking)
Between P – N voltage
Compressor ON : DC 380V
Compressor OFF: (This voltage is an execution value with entry voltage. Supply voltage 240V >>> 273V )
Permanent stop : 0V
Active filter Cut off Error
While Active Filter is ON, if the voltage detection value becomes less than 180V; Compressor and outdoor fan are
　　 stopped.
LED : (Timer LED 0.1sec. flash / Operation LED 0.5sec. 8 times blinking)
Active Filter Module Error
While Active Filter is ON, if the voltage detection value becomes less than 250V;
Compressor and outdoor fan are stopped.
LED : (Timer
(Timer LED 0.1sec. flash / Operation LED 0.5sec. 8 times blinking)
Over current protection of IPM
The compressor is stopped if the IPM current becomes operation error during the operation.
LED : (Timer LED 0.1sec.flash / Operation LED 0.5sec. 5time blinking)
Cooling high-pressure rise protection

If the outdoor heat exchanger temperature becomes higher than 65degC after 1 minute of compressor start up
during the cooling operation:
Compressor and Fan Motor stop.
LED : (Timer
(Timer LED 0.1sec. flashing / Operation LED 0.5sec. 7 times blinking)
Compressor location Error

When the compressor location error (polarity shift) is occurred at location detection circuit:
Compressor is restarted after 3ST, and if does not start up 3 times, it becomes permanent stop.
LED : (Timer
(Timer LED 0.1sec. flashing / Operation LED 0.5sec. 5 times blinking)
Current trance abnormal detection

When the compressor is running higher than 90 rps and the current value detected at the current transformer is
abnormal: Compressor and Fan Motor stop.
Compressor is restarted after 3ST, and if does not start up 2 times, it becomes permanent stop.
LED : (Timer LED 0.1sec. flashing / Operation LED 0.5sec. 5 times blinking)
The order of error indication that is memorized is as follows.
OPERATION TIMER
Primary Indication
1. Insert the AC power plug
2. Start the operation by the remote control.
3. Press TEST button.

The defective part is indicated by the continuous blinking in 1 second or 0.1 second of TIMER
LED (Serial signal error), and by the number of blinking count of Operation LED.
Detailed Error Display Indication

1.At the primary indication.
2.Press TEST button.
Operation LED starts to blink in 0.1 second interval.

The detail of the defective part is indicated with the number of blinking by TIMER LED.
To go back from Detailed Error Display to Primary Error Display, press TEST button.
The error indication is effective only 2 minutes 20 seconds after inserting the AC power plug.
How to clear the memorized error Example of Indication)
Press MANUAL AUTO button during the error indication is on. Serial Signal Error PRIMARY INDICATION
It is cleared with the buzzer (3 seconds). OPERATION TIMER
Error Information ASY12LSAC/ AOY12LSAC
Error pdf

Trouble 　 Shooting 　 ASY12LSAC/ AOY12LSAC
Checking Method Example
Indoor unit control Error OPERATION LED 3 times flash

Room temperature PCB TIMER LED FLASH
Indicator PCB 0.1 sec.
Thermisutor Outdoor Thermistor Error !
Micro processor
Pipe temperature 　 Trouble Shooting Flow
Thermistor Louver
Motor Detailed Error Indication
Check
AC Power supply
Remove the thermistor which was detected error
Indoor
and check the resistance FAN
value.
Serial signal circuit
Replace the thermistor.
Check if DC5V appears at the connection

terminal of the thermistor.
Outdoor unit control Diode bridge PWB
PCB Replace the control PCB.
Power supply
IPM Module Compressor
Discharge temperature Serial signal circuit
Thermistor
4 Way Valve
Outdoor temperature
E EV Valve
Thermisutor
Micro processor
Pipe temperature
Thermistor Outdoor Fan
Motor

Checking Method Example Error OPERATION LED 5 times flash
TIMER LED FLASH 0.1 sec.
Indoor unit control
PCB Compressor location Error !
Room temperature Indicator PCB
Thermisutor
Micro processor
Pipe temperature
Trouble Shooting Flow
Thermistor Louver
Motor
　 Check
AC Detailed Error Indication Power supply
Check the AC (DC) voltage appear at U,V,W 　 Indoor FAN
terminal with a good balance.
Measure the DC voltage between P and N

of IPM.
DC:Approx.270V(When compressor is stopped),
380V(When compressor is operating,
0V (at permanent stop) PCB
Replace IPM Power supply
Replace the compressor.
Thermistor
4 Way Valve
Outdoor temperature
E EV Valve
Thermisutor
Micro processor
Pipe temperature
Motor

Indoor unit control Error OPERATION LED NORMAL

Room temperature PCB TIMER LED Indicator
FLASH
PCB 0.1 sec.
Thermisutor Serial signal Error !
Micro processor
Pipe temperature
Thermistor Trouble Shooting Flow
Louver
Motor
Check Error Indication
AC Power supply
Check if there is a mistake in cable
Indoor FANwiring between
Indoor and Outdoor Unit, or any abnormal contact.
If a incorrect wiring or defective contact is found:

Please be sure to pull out the plug.

Measure the AC voltage between N – Ground.
PCB Check the serial (forward/reverse) pulse
(by using anActive
analogFilter Module
meter)
Power supply
Discharge temperature Serial signal circuit Check 5V at DC5V point on the
Thermistor control PCB
4 Way Valve
Outdoor temperature
Replace
E EV the
Valve
control PCB.
Thermisutor
Micro processor
Pipe temperature
Motor

AWY14LSACW / AOY14LSAWC
Major feature of the product

WALL 　 MOUNTED 　 Single 　 Inverter
　 Ceiling 　 Wall 　 type
Energy Saving DC Inverter PWM & PAM system
Refrigerant used : R410A
UV Disinfection / Deodorant
UV Inside Cleaning
Minus Ion Operation
Indoor / Outdoor Temperature Indication
Original Remote Control
No additional charge required up to 15m

Input / Output AWY14LSACW/AOY14LSAWC
Indicator PCB DC 15V Input
Indoor unit control PCB Indoor
　　　 Thermistor FAN
DC 12V Input
Room temperature motor Louver
Pipe temperature Power Supply circuit
Motor
×3
Limit SW 1,2 (Filter L&R) Serial Signal circuit Diffuser
Motor Filter
DC 5V input Micro processor Drive
Motor
Indoor unit Buzzer
ANION ×2
UV lump
Diode bridge PWB DC 12V input

　　　　 Thermistor
Discharge temperature Outdoor unit control
PCB Active Filter Module
Outdoor temperature
Pipe temperature Capacitor
Power Supply circuit
IPM Module AC input ON / OFF Control
Serial Signal circuit 4 Way Valve
E EV Valve
Micro processor
Compressor
Outdoor unit Outdoor DC inverter input
Fan
Motor
DC15V input
Circuit Diagram AWY14LSACW Pdf file
AWY14LSAWC
Indoor unit
Output
Input Indoor unit Micon specifications
Operation mode control
Set temperature control
Indoor unit FAN motor
ECONOMY operation DC motor
Manual auto and
Fan control / Air direction control /Swing control
Filter Reset button
Air clean control /Filter maintenance Louver motor (×3)
Temperature MONITOR / Timer mode Stepping motor
Infrared lay signal 2disit 7Segment display /Coil dry control
Filter Reset and Manual auto button
Diffuser motor
Room temperature Energy Save or Normal operation(ECONOMY)
Thermister Hi power operation Stepping motor
Outdoor unit power relay control
Heat exchanger temperature Indoor unit Fan control Filter drive motor
Thermister Louver Stepping motor control Stepping motor
Diffuser motor control
Filter drive stepping motor control UV lump
Filter Limit SW 1,2 UV lump control / ANION control (AIR CLEAN)
Room temperature revise AN ion
Auto change over
Compressor driving frequency change
Start circuit Buzzer
Cooled air prevention
Over load protection Heating
Prevention of icing LED
Air flow direction (AIR DIRECTION)
Auto defrosting operation / Pre heating Out door unit power relay
Indoor FAN lock prevention
Auto restart / 3minutes ST
50/60Hz auto change / Test run
Microcomputer Control AWY14LSAWC
ECONOMY OPERATION (Energy Save or Normal) mode control
At the maximum output, ECONOMY Operation is approximately 70% of normal conditioner operation for
heating and cooling.
The set up temperature at Cooling and Heating mode is changed to + 1degC, and the compressor and the fan
motor are changed to ECONOMY operational condition.
Filter maintenance
Operation Press FILTER MAINTENANCE button on the remote control (manually)
Based on the accumulated operation hours (Remote setting : either 200hours or 150 hours) the
filter cleaning operation is performed automatically.
While in operation, the green MAINTENANCE LED is turned on.
In case of filter mounting error or detection error of the limit switch, MAINTENANCE LED (green) is
turned ON for 1 second and OFF for 1 second. 7 segment indication is not performed.
Dust Box Maintenance Warning

When the accumulated operation hour becomes 2,000 hours, the operation stops and Filter Cleaning
Operation (Automatic / 1 time) is conducted.
MAINTENANCE LED (Red) blinks at the same time.
When MAINTENANCE LED is blinking, by pressing the filter reset and manual button, the dust box
maintenance accumulated hour is reset and turns off the red LED.
2 Digit 7 Segment Display

Press Monitor button on remote control and the following is indicated after 60 seconds of starting operation.
Outdoor Temperature Indication => Indoor Temperature Indication => No Indication
The outdoor temperature indication lasts only 10 seconds and changes to the indoor temperature indication
after 10 seconds.
When Error is indicated on 2 segment display, the place of 10 shows the primary error indication and the place
of 1 shows the detailed error indication.
Microcomputer Control AWY14LSAWC
Filter Reset and Manual auto button
Press for more than 3 seconds and AUTO Operation is performed.
(In case of error indication, error content is cleared.)
Press for less than 3 seconds and Dust Box Maintenance Accumulated hour is reset.
Hi power operation
Heating mode : Compressor and Fan Motor operates under High Power mode until the temperature reaches
Set-up temperature +2 degC
after 15 minutes of starting High power operation.
Cooling mode : Compressor and Fan Motor operates under High Power mode until the temperature reaches
Set-up temperature - 2 degC
or 30 minutes after starting High power operation.
When operating on High Power mode, Orange LED is turned ON.
UV lamp control / Minus Ion Control (Air Cleaning)

Air Cleaning is performed by UV unit and Minus Ion Generator.
(It operates at Normal Operation or Stop mode (Solo Air Cleaning Function))
UV Unit Power Input : DC13.2V
Minus Ion Generator Power Input : DC13V
It does not operate while the indoor fan is stopped.
Air Flow Direction (Air Direction)

Louvers Cooling mode : can be adjusted at 3 steps downward from the horizontal position.
Heating mode : can be adjusted at 3 steps upward from the lowest Position
Defrost / FAN mode : can be adjusted at 7 steps from the horizontal position.
Horizontal Louver
Moves to Center Flow, Right Flow, Center Flow, Left Flow.
AOY14LSAWC
Outdoor unit
Input Output
OUT 　 DOOR 　 temperature Micon control specifications 4way 　 valve
Thermister Operation control Compressor Cooling : OFF
Operation control outdoor FAN motor Heating: ON
Dry : OFF 　
DISCHARGE 　 TEMPERATURE EEV- valve control
Thermister Operation control Defrost
Active filter control Compressor
Over current protection of IPM It corresponding to the rpm order
Heat 　 Exchanger 　 temperature
of the Forward serial signal
Thermister 　 Electric current passing failure protection
High pressure passing ascent protection
DRIVE CURRENT CT abnormal detection
FAN 　 motor (DC MOTOR)
Power souse cut off instantaneously detection
Compressor location detection
IPM OVER LOAD CURRENT (IPM)
Compressor Preheating
3 minutes ST EEV valve
4way valve control Internalize
(It is set to stipulated pulse of each
Serial 　 SIGNAL(Forward ） Timer short operating.)
Pre Heating
Thermister abnormal detection
Serial 　 SIGNAL(Reverse ）
LED
Microcomputer Control AOY14LSAWC
Compressor Operation Control

Compressor speed is decided by the compressor speed bit of the serial forward transfer signal, but at the
start up, it rotates at 40 rps speed at all time. ASY12L : 56 rps
Outdoor Fan Motor Control

At Cooling and Heating mode, depending on the compressor speed it rotates at;
LO-1, LO-2, Med-1, Med-2, Hi-1, Hi-2.
While defrosting or High power operation in the heating mode, it rotates at;
S-Hi-1, S-Hi-2.
If the IPM current becomes higher than 17A, it rotates at S-Hi-1 (Inverter Temperature Rise Protection).
Outdoor Fan Motor Location Error
When Location Error is detected during operation
LED : (Timer LED 0.1 sec. Flashing / Operation LED 0.5 sec. 5 times blinking)
7 segment indication : 56
Active Filter Control

PWM / PAM Control
PWM control system is activated when the compressor is controlled at lower than 310V.
PAM control system is activated when the compressor is controlled at higher than 310V.

Active Filter Abnormal Voltage Detection
If over 425V or below 80V of DC voltage is detected just before turning on the active filter, the compressor
and the outdoor fan are stopped.
By detecting this error for 3 times, it results in the permanent stop.
LED : (Timer LED 0.1sec. flashing / Operation LED 0.4 sec. 8 times)
7 segment indication : 83
Trouble 　 Shooting 　 AWY14LSAC/ AOY14LSWC
Pdf file
The main unit does not indicate the error in case of UV lamp cut out and the defective minus ion
generator. And the unit operates normally with the blue LED on.
So the customer can not notice from outside.

How to check the function by a service technician.

Remote Control’s service mode is used to troubleshoot the UV lamp and Minus Ion Generator.

By pressing SET TEMP. UP and DOWN simultaneously, press ACL button.
Then the indication becomes =A . (This means it is in the service mode)
Press START/STOP button to scroll in order of A, B, C, D, E, F, No Indication, A.

Check the UV lamp by transmitting B-mode signal.
If there is UV lamp failure, an alarm will sound.
(To demonstrate, remote the lamp connector and show the error !)

Minus Ion Generator is checked by E-mode.
In case of Minus Ion Generator failure, an alarm will sound.

Trouble 　 Shooting 　 AWY14LSAC / AOY14LSAC
Room temperature Error OPERATION LED Normal
Indicator PCB
Thermisutor Indoor unit control TIMER LED Normal
PCB Diffuser
Pipe temperature MAINTENANCE LED flash 1sec.
Motor
Thermistor Louver Filter setting ERROR
Micro processor
MotorMaintenance LED is blinking but 7
Louver
Limit SW MotorSegment error is not indicated.
LouverThe unit can be operated.
AC Power supply Motor
Filter
Serial signal circuit MotorTrouble Shooting Flow
In this case, the detection error of the limit switch
Indoor FAN
ON or OFF can be suspected.
ANION
Remote the connector of the switch and check the
UV lump
continuity of ON and OFF by a meter.

Replace the switch.
PCB
Power supply If DC 12V appears at the connector wire
(White):
IPM Replace
Module the controller PCB.
Discharge temperature Compressor
Thermistor
4 Way Valve
Outdoor temperature
E EV Valve
Thermisutor
Micro processor
Pipe temperature
Motor

Room temperature OPERATION LED OFF
Error Indicator PCB
Thermisutor Indoor unit control
TIMER LED PCB OFF Diffuser
MAINTENANCE LED OFF
Pipe temperature Motor
Thermistor Louver
Remote control doesMicro processor
not work Motor
Louver
Limit SW Motor
Louver Trouble Shooting Flow
AC Power supply Motor
Filter
Check the remote function and ACL, etc.
Serial signal circuit Motor
　 Check AC FAN
Indoor input.
ANION
UV lump
By pressing MANUAL AUTO button for 3
seconds or more and make sure if the
Outdoor unit control Diode bridge
buzzer PWBand the unit operates.
sounds
PCB
　 Check the power supply.
Power supply
Discharge temperature Serial signal circuit 　 Check the continuity of the thermal fuse.
Thermistor
4 Way Valve
Replace the thermal fuse.
Outdoor temperature
E EV Valve
Thermisutor Check DC5V of CN5.
Micro processor
Pipe temperature
Replace
Motor the indicator PCB.
Replace the controller PCB.

Room temperature
Trouble Shooting Flow
Error OPERATION LED 6 times flash
Indicator PCB
Thermisutor Indoor unit control TIMER LED FLASH 0.1 sec.
It is considered that either fan motor is notPCB
rotating Diffuser
or DCtemperature
Pipe voltage is not supplied from the control PCB. Indoor Fan Motor lock Error
Motor
Thermistor Louver
Micro processor
Motor
Check DC12V between the connector 3 – 4. Louver
Limit SW Motor
Louver
If the connector
AC voltage is normal, Motor
Power supply
replace the fan motor. Filter
Serial signal circuit Motor
Replace Controller PCB
Indoor FAN
ANION
UV lump

PCB
Power supply
Thermistor
4 Way Valve
Outdoor temperature
E EV Valve
Thermisutor
Micro processor
Pipe temperature
Motor

BASIC REFRIGERATING CYCLE
Cooling Evaporator
Heating
4- way valve Strainer

Light color :Gus
Dark color :Liquid
Arrow(small): Low pressure

Arrow(large): High pressure
Accumulator
Capillary tube
Compressor
Heat exchanger
Trouble Shooting
Abnormal electric parts Mistake operation

LED unusual flashing. The system does not operate at all.
The power supply is not turned on. Remote control does not operate.
The indoor fan does not rotate. Water leakage.
The outdoor fan does not rotate.
The compressor does not rotate. Mistake installation work
Trouble of pipe connection.
The refrigerating cycle is not normal Trouble of electric wiring.
Trouble of draining.
The room does not get cool enough.
The room does not get warm enough.
Effect of environment
Others Change in surroundings in environment
Feature in region(dryness, salt damage, and humidity)
Noise or vibration sound come out.
Water leakage.
Defective condition (Sudden, Just

after Installation, After Repair, By asking the customer
etc.) the defective condition.
Is the trouble always happen or
intermittently happen?

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Inverter

Field Failure Example of Past Models

Principle of rotation control

Inverter control system

 Fujitsu GENERAL Customer Service

Problems in the conventional model

 Fujitsu GENERAL Customer Service

Low temperature condition Common model Inverter Model

Capacity when outdoor temp.

Improved by the inverter

Raise the capacity by increase the revolution of compressor.

 Fujitsu GENERAL Customer Service

Conventional Model Inverter

Room temperature (deg.)

40 min. Time 20 min. Time

Improved by the inverter

By spinning compressor motor at high revolution since start

Room temperature (deg.)

Improved by the inverter

The range of changed room temperature is small. Because after reached

Conventional model Inverter model

 Fujitsu GENERAL Customer Service

AC Indoor unit control

Diode bridge Active Filter Module

Indoor unit IPM

Single Phase current The fixed direct The variable voltage

CONTROL CIRCUITE (MICRO PROSSSOR)

 Fujitsu GENERAL Customer Service

PAM Control System

 Fujitsu GENERAL Customer Service

Indoor unit control PCB

Buzzer Indoor FAN

Diode bridge PWB

Micro processor E EV Valve

 Fujitsu GENERAL Customer Service

Power Supply Circuit

Current Detection Circuit

When compressor is stopped = Input Voltage x Root 2 (Effective Value)

Oscillator for Micon

IPM (Integrated Power Module)

The rotor is made of permanent magnet.

The power to electromagnet the rotor is required additionally.

Serial Communication Circuit

Power Relay ON/OFF control

Indoor FAN S-HI control

Indoor Fan lock prevention

Active Filter Control

Cooling high-pressure rise protection

Compressor location Error

Current trance abnormal detection

2. Start the operation by the remote control.

3. Press TEST button.

Detailed Error Display Indication

2.Press TEST button.

Operation LED starts to blink in 0.1 second interval.

 Fujitsu GENERAL Customer Service

Indoor unit control Error OPERATION LED 3 times flash

Replace the thermistor.

Inverter 　

Principle of rotation control 　

 Fujitsu 　 GENERAL 　 Customer 　 Service 　

 Fujitsu 　 GENERAL 　 Customer 　 Service 　

 Fujitsu 　 GENERAL 　 Customer 　 Service 　

 Fujitsu 　 GENERAL 　 Customer 　 Service 　

 Fujitsu 　 GENERAL 　 Customer 　 Service 　

 Fujitsu 　 GENERAL 　 Customer 　 Service 　

 Fujitsu 　 GENERAL 　 Customer 　 Service 　

 Fujitsu 　 GENERAL 　 Customer 　 Service 　

 Fujitsu 　 GENERAL 　 Customer 　 Service 　

 Fujitsu 　 GENERAL 　 Customer 　 Service 　

 Fujitsu 　 GENERAL 　 Customer 　 Service 　

 Fujitsu 　 GENERAL 　 Customer 　 Service 　

 Fujitsu 　 GENERAL 　 Customer 　 Service 　

 Fujitsu 　 GENERAL 　 Customer 　 Service 　

 Fujitsu 　 GENERAL 　 Customer 　 Service 　