Hitachi RAS-20CNHZ2 User manual

NO. 0148E
SERVICE MANUAL
PM
TECHNICAL INFORMATION
FOR SERVICE PERSONNEL ONLY
SPECIFICATIONS
CONTENTS
SPECIFICATIONS ------------------------------------------------------------------- 7
HOW TO USE ---------------------------------------------------------------------- 10
CONSTRUCTION AND DIMENSIONAL DIAGRAM --------------------- 35
MAIN PARTS COMPONENT -------------------------------------------------- 37
WIRING DIAGRAM---------------------------------------------------------------- 39
CIRCUIT DIAGRAM--------------------------------------------------------------- 41
PRINTED WIRING BOARD LOCATION DIAGRAM--------------------- 43
BLOCK DIAGRAM----------------------------------------------------------------- 49
BASIC MODE ----------------------------------------------------------------------- 51
REFRIGERATING CYCLE DIAGRAM --------------------------------------- 64
DESCRIPTION OF MAIN CIRCUIT OPERATION (INDOOR)-------- 65
DESCRIPTION OF MAIN CIRCUIT OPERATION (OUTDOOR) ---- 71
TROUBLE SHOOTING----------------------------------------------------------- 95
PARTS LIST AND DIAGRAM------------------------------------------------- 110
RAS-20CNHZ2
RAS-30CNHZ2
REFER TO THE FOUNDATION MANUAL
INDOOR UNIT
RAS-20CNHZ2 RAS-30CNHZ2
OUTDOOR UNIT
RAM-50CNHZ2
DC INVERTER DUAL SYSTEM MULTI (WALL TYPE)
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
ROOM AIR CONDITIONER
INDOOR UNIT + OUTDOOR UNIT
MAY 2002
H.A.P.M.
TYPE
MODEL
1ø, 220V – 230V, 50HzPOWER SOURCE
TOTAL INPUT
TOTALAMPERES
COOLING CAPACITY
HEATING CAPACITY
DIMENSIONS
NET WEIGHT
(W)
(A)
(kW)
(B.T.U.)
W
H
D
(kg)
(mm) 745
248
175
5.5
850
650
298
43
RAS-20CNHZ2
RAM-50CNHZ2
RAS-30CNHZ2
RAM-50CNHZ2
798
265
168
6.5
REFER TO THE SPECIFICATIONS PAGE 8.

– 1 –
SAFETY DURING REPAIR WORK
1. In order to disassemble and repair
the unit in question, be sure to
disconnect the power cord plug
from the power outlet before starting
the work.
2. If it is necessary to replace any parts, they should be replaced with respective genuine parts for the unit, and
the replacement must be effected in correct manner according to the instructions in the Service Manual of
the unit.
If the contacts of electrical parts
are defective, replace the
electrical parts without trying to
repair them.
3. After completion of repairs, the initial state
should be restored.
4. Lead wires should be connected and laid as
in the initial state.
5. Modification of the unit by user himself should
absolutely be prohibited.
6. Tools and measuring instruments for use in repairs or inspection should be accurately calibrated in advance.
7. In installing the unit having been repaired, be careful to prevent the occurence of any accident such as
electrical shock, leak of current, or bodily injury due to the drop of any part.
8. To check the insulation of the unit, measure the insulation resistance between the power cord plug and
grounding terminal of the unit. The insulation resistance should be 1M or more as measured by a 500V
DC megger.
9. The initial location of installation such as window, floor or the other should be checked for being and safe
enough to support the repaired unit again.
If it is found not so strong and safe, the unit should be installed at the initial location reinforced or at a new
location.
10. Any inflammable thing should never
be placed about the location of
installation.
11. Check the grounding to see whether
it is proper or not, and if it is found
improper, connect the grounding
terminal to the earth.
First, I must disconnect
the power cord plug
from the power outlet.
DANGER

–2 –
WORKING STANDARDS FOR PREVENTING BREAKAGE OF SEMICONDUCTORS
1. Scope
The standards provide for items to be generally observed in carrying and handling semiconductors in relative
manufacturers during maintenance and handling thereof. (They apply the same to handling of abnormal goods
such as rejected goods being returned).
2. Object parts
(1) Micro computer
(2) Integrated circuits (IC)
(3) Field-effect transistors (FET)
(4) P.C. boards or the like on which the parts mentioned in (1) and (2) of this paragraph are equipped.
3. Items to be observed in handling
(1) Use a conductive container for carrying and storing of parts. (Even rejected goods should be handled in
the same way).
Fig. 1. Conductive Container
(2) When any part is handled uncovered (in counting, packing and the like), the handling person must always
use himself as a body earth. (Make yourself a body earth by passing one M ohm earth resistance through
a ring or bracelet).
(3) Be careful not to touch the parts with your clothing when you hold a part even if a body earth is being
taken.
(4) Be sure to place a part on a metal plate with grounding.
(5) Be careful not to fail to turn off power when you repair the printed circuit board. At the same time, try
to repair the printed circuit board on a grounded metal plate.
1M
Fig. 2. Body Earth
Body earth
(Elimik conductive band)
Clip for connection with a
grounding wire
IC
A conductive polyvinyl bag IC
Conductive sponge

–3 –
(6) Use a three wire type soldering iron including a grounding wire.
Bare copper wire (for body earth)
Working
table
Resistor of 1 M (1/2W)
Earth wire
Fig. 3. Grounding of the working table
2
Screw stop at the screwed
part using a rag plate
Soldering iron
Grounding
wire
Fig. 4. Grounding a soldering iron
Use a high insulation mode (100V, 10M or higher) when ordinary iron is to be used.
(7) In checking circuits for maintenance, inspection or some others, be careful not to have the test probes of the
measuring instrument shortcircuit a load circuit or the like.
Metal plate (of aluminium, stainless steel, etc.)
Staple

–4 –
1. In quiet operation or stopping the operation, slight flowing noise of refrigerant in the refrigerating cycle is
heard occasionally, but this noise is not abnormal for the operation.
2. When it thunders near by, it is recommend to stop the operation and to disconnect the power cord plug from
the power outlet for safety.
3. The room air conditioner does not start automatically after recovery of the electric power failure for preventing
fuse blowing. Re-press START/STOP button after 3 minutes from when unit stopped.
4. If the room air conditioner is stopped by adjusting setting temperature, or missoperation, and re-start in a
moment, there is occasion that the cooling and heating operation does not start for 3 minutes, it is not
abnormal and this is the result of the operation of IC delay circuit. This IC delay circuit ensures that there
is no danger of blowing fuse or damaging parts even if operation is restarted accidentally.
5. This room air conditioner should not be used at the cooling operation when the outside temperature is below
10°C (50°F).
6. This room air conditioner (the reverse cycle) should not be used when the outside temperature is below
-10°C (14°F).
If the reverse cycle is used under this condition, the outside heat exchanger is frosted and efficiency falls.
7. When the outside heat exchanger is frosted, the frost is melted by operating the hot gas system, it is not
trouble that at this time fan stops and the vapour may rise from the outside heat exchanger.
CAUTION

–5 –
SAFETY PRECAUTION
●
Please read the “Safety Precaution”carefully before operating the unit to ensure correct usage of the unit.
●
Pay special attention to signs of “Warning”and “Caution”. The “Warning”section contains matters which,
if not observed strictly, may cause death or serious injury. The “Caution”section contains matters which may
result in serious consequences if not observed properly. Please observe all instructions strictly to ensure safety.
●
The sign indicate the following meanings.
●
Please keep this manual after reading.
WARNING
PRECAUTIONS DURING INSTALLATION
●Do not reconstruct the unit.
Water leakage, fault, short circuit or fire may occur if you reconstruct
the unit by yourself.
●Please ask your sales agent or qualified technician for the installation
of your unit. Water leakage, short circuit or fire may occur if you install
the unit by yourself.
●Please use earth line.
Do not place the earth line near water or gas pipes, lightning-conductor,
or the earth line of telephone. Improper installation of earth line may
cause electric shock.
●A circuit breaker should be installed depending on the mounting site of
the unit. Without a circuit breaker, the danger of electric shock exists.
●Do not install near location where there is flammable gas. The outdoor
unit may catch fire if flammable gas leaks around it.
●Please ensure smooth flow of water when installing the drain hose.
CAUTION
PRECAUTIONS DURING SHIFTING OR MAINTENANCE
PRECAUTIONS DURING OPERATION
●Avoid an extended period of direct air flow for your health.
W
A
R
N
I
N
G
●Should abnormal situation arises (like burning smell), please stop operating the unit
and turn off the circuit breaker. Contact your agent. Fault, short circuit or fire may
occur if you continue to operate the unit under abnormal situation.
●Please contact your agent for maintenance. Improper self maintenance may cause
electric shock and fire.
●Please contact your agent if you need to remove and reinstall the unit. Electric
shock or fire may occur if you remove and reinstall the unit yourself improperly.
●Do not put objects like thin rods into the panel of blower and suction side
because the high-speed fan inside may cause danger.
●During thunder storm, disconnect and turn off the circuit breaker.
●Do not use any conductor as fuse wire, this could cause fatal accident.
Make sure to connect earth line.
Indicates the instructions that must be followed.
The sign in the figure indicates prohibition.
W
A
R
N
I
N
G

–6 –
PRECAUTIONS DURING OPERATION
●Do not attempt to operate the unit with wet hands, this could cause fatal
accident.
●When operating the unit with burning equipments, regularly ventilate the
room to avoid oxygen insufficiency.
●Do not direct the cool air coming out from the air-conditioner panel to face
household heating apparatus as this may affect the working of apparatus
such as the electric kettle, oven etc.
●Do not place plants directly under the air flow as it is bad for the plants.
●Please ensure that outdoor mounting frame is always stable, firm and
without defect. If not, the outdoor unit may collapse and cause danger.
●Do not splash or direct water to the body of the unit when cleaning it as this
may cause short circuit.
●When operating the unit with the door and windows opened, (the room humidity is always above
80%) and with the air deflector facing down or moving automatically for a long period of time,
water will condense on the air deflector and drips down occasionally. This will wet your furniture.
Therefore, do not operate under such condition for a long time.
●If the amount of heat in the room is above the cooling or heating capability of the unit (for
example: more people entering the room, using heating equipments and etc.), the preset room
temperature cannot be achieved.
●Do not climb on the outdoor unit or put objects on it.
●Please switch off the unit and turn off the circuit breaker during cleaning, the
high-speed fan inside the unit may cause danger.
●Turn off the circuit breaker if the unit is not to be operated for a long period.
C
A
U
T
I
O
N
●The product shall be operated under the manufacturer specification and
not for any other intended use.
●Do not put water container (like vase) on the indoor unit to avoid water
dripping into the unit. Dripping water will damage the insulator inside the unit
and causes short-circuit.

–7 –
RAM-50CNHZ2
40 W
NO
NO
GW20DN8A
NO
YES
YES
3.0A
25A
2A
G4A
NO
NO
YES
NO
450NR
20132A
YES(IC)
NO
MODEL
FAN MOTOR
FAN MOTOR CAPACITOR
FAN MOTOR PROTECTOR
COMPRESSOR
COMPRESSOR MOTOR CAPACITOR
OVERLOAD PROTECTOR
OVERHEAT PROTECTOR
FUSE (MICRO COMPUTER CIRCUIT)
FUSE (MAIN SUPPLY)
FUSE (FAN MOTOR)
POWER RELAY
POWER SWITCH
TEMPORARY SWITCH
SERVICE SWITCH
TRANSFORMER
VARISTOR
NOISE SUPPRESSOR
THERMOSTAT
REMOTE CONTROL SWITCH (LIQUID CRYSTAL)
FUSE CAPACITY
RAS-20CNHZ2/
RAS-30CNHZ2
20 W
NO
NO
—
NO
NO
NO
NO
NO
NO
NO
NO
YES
NO
NO
NO
NO
YES(IC)
YES
SPECIFICATIONS
---------- ❈ 1350g
UNIT
PIPES (MAX. 35m)
REFRIGERANT CHARGING
VOLUME
(Refrigerant 22) WITHOUT REFRIGERANT BECAUSE
COUPLING IS FLARE TYPE.
16 A TIME DELAY FUSE

–8 –
SPECIFICATIONS FOR INDOOR UNITS COMBINATIONS
TYPE WALL TYPE DC INVERTER QUADRUPLE SYSTEM MULTI
COOLING AND HEATING
MODEL INDOOR UNIT
PHASE/VOLTAGE/FREQUENCY
CIRCUIT AMPERES TO CONNECT (A)
COOLING
(ONE UNIT)
COOLING
(TWO
UNITS)
HEATING
(ONE UNIT)
HEATING
(TWO
UNITS)
CAPACITY (kW)
(B.T.U./h)
TOTAL INPUT (W)
EER (B.T.U./hW)
TOTAL AMPERES (A)
POWER FACTOR (%)
SOUND LEVEL (INDOOR)
AIR FLOW VOLUME (Hi)
CAPACITY (kW)
(B.T.U./h)
TOTAL INPUT (W)
EER (B.T.U./hW)
TOTAL AMPERES (A)
POWER FACTOR (%)
SOUND LEVEL (OUTDOOR)
CAPACITY (kW)
(B.T.U./h)
TOTAL INPUT (W)
EER (B.T.U./hW)
TOTAL AMPERES (A)
POWER FACTOR (%)
SOUND LEVEL (INDOOR)
AIR FLOW VOLUME (Hi)
CAPACITY (kW)
(B.T.U./h)
TOTAL INPUT (W)
EER (B.T.U./hW)
TOTAL AMPERES (A)
POWER FACTOR (%)
SOUND LEVEL (OUTDOOR)
AIR DEFLECTORS
FAN SPEED
LINE CORD
REMOTE CONTROL SWITCH
MAXIMUM LENGTH OF PIPING
STANDARD
RAS-20CNHZ2
1ø, 220V-230V, 50Hz
16
2.50 (1.00~3.00)
1000 (300~1080)
8.53
4.50
97
33
5.7m3/min
RAS-30CNHZ2
3.20 (1.00~3.30)
8530 (3412~10236) 10919 (3412~11260)
1100 (300~1160)
9.93
5.00
96
35
8.5m3/min
2150 (450~2200)
8.57
9.40
99
50
5.40 (1.00~5.60)
18426 (3412~19108)
3.60 (0.90~4.00)
1470 (120~1690)
8.36
6.50
98
33
7.7m3/min
12284 (3071~13649) 4.50 (0.90~4.60)
1900 (120~1920)
8.08
8.30
99
37
9.5m3/min
15355 (3071~15696)
2100 (450~2300)
9.66
9.20
99
52
6.40 (1.50~7.00)
21838 (5118~23885)
YES (AUTO SWING)
3
YES (AUTO SWING)
3
YES (WIRELESS) YES (WIRELESS)
NOT PROVIDED (POWER CORD SHOULD BE PREPARED AND
CONNECTED TO OUTDOOR UNIT WHEN INSTALLED)
MAX. 35m (TWO UNITS TOTAL)
CE (EMC&LVD)
MODEL RAM-50CNHZ2RAS-20CNHZ2
PACKING
(mm)
W
H
D
cu.ft.
GROSSWEIGHT (kg)
FLARENUTSIZE (SMALL/LARGE)
792
302
255
2.15
9.5
—
1008
698
394
9.79
48
6.35D/9.52D, 6.35D/9.52D
OUTDOOR UNIT RAM-50CNHZ2
RAS-30CNHZ2
850
340
270
2.76
10
—

–9 –
INSTALLATION
HEIGHT DIFFERENCE
Height difference between indoor units should not be more than 5m.
PIPING LENGTH
(L1 + L2) = Maximum 35m
Maximum piping length for one indoor unit is 25m.
TWO
UNITS ~20m add 0g
~25m add 25g
~30m add 50g
~35m add 75g
Additional R-22
2.5+2.5
2.5+3.2
3.2+3.2
0g
0g
(Within ±10 m)
Indoor unit 1
Indoor unit 2
Maximum 5 m
Outdoor unit
L2 L1
Indoor unit 1Indoor unit 2
Outdoor unit

–10 –
Outdoor Units:
●Even after operation is stopped, the fan of the outdoor unit continues to rotate for 10-60 seconds to cool the internal
electrical parts.
●During heating, condensed water flows out from the outdoor unit and the defrosting water flows out during defrosting.
Do not block the drain outlet of the outdoor unit in a cold place; otherwise the condensed or defrosting water could
freeze.
MULTI-AIR CONDITIONER
With this multi-air conditioner, 2 indoor units can be connected to one outdoor unit to be driven. You can operate the
required number of indoor units.
Combination of Operations:
●You cannot operate the indoor units in the
following combination. ●The indoor unit which is switched on first continues to operate, but other indoor units which is switched on later does not
operate while the lamp lights.
●To re-start an indoor unit which was operated later, stop the
indoor unit which was operated first or later and reset the type
of operation, then perform operation again.
One unit
Heating
Heating
Heating
Other unit
Cooling
Dehumidifying
Circulating (fan)
Adjusting the Number of Indoor Units:
The more the indoor units to be operated, the lower the power of each unit. Refer to the
specification on installation manual. Decrease the number of indoor units to be operated
especially when it is very hot or cold or when you want to reach the present temperature
quickly.
Stopped Indoor Units:
When an indoor unit is operated in the cooling, heating or dehumidifying mode in the room, the sound of refrigerant flow
may be heard from a stopped indoor unit or a stopped indoor unit may become warm. This is because the indoor unit
returns refrigerant to the outdoor unit to be ready for operation.
OUTDOOR UNIT
WIDTH (mm)
744
798
850
MODEL
RAS-20CNHZ2
RAS-30CNHZ2
RAM-50CNHZ2
HEIGHT (mm)
248
265
650
DEPTH (mm)
168
168
298
MODEL NAME AND DIMENSIONS
DRAIN PIPE
Condensed water drain to outside.
CONNECTING CORD
AIR INLET (BACK, LEFT SIDE)
AIR OUTLET
NAMES AND FUNCTIONS OF EACH PART

–11 –
INDOOR UNIT
NAMES AND FUNCTIONS OF EACH PART
AIR FILTER
To prevent dust from coming into the indoor unit.
(Refer page 30)
INDOOR UNIT INDICATORS
Light indicator showing the operating condition.
(Refer page 12)
FRONT PANEL (AIR INLET)
HORIZONTAL DEFLECTOR ●VERTICAL
DEFLECTOR (AIR OUTLET)
(Refer page 24)
REMOTE CONTROLLER
Send out operation signal to the indoor unit. So as to
operate the whole unit.
(Refer page 14)
AIR FILTER
To prevent dust from coming into the indoor unit.
(Refer page 31)
INDOOR UNIT INDICATORS
Light indicator showing the operating condition.
(Refer page 13)
FRONT PANEL (AIR INLET)
HORIZONTAL DEFLECTOR ●VERTICAL
DEFLECTOR (AIR OUTLET)
(Refer page 24)
REMOTE CONTROLLER
Send out operation signal to the indoor unit. So as to
operate the whole unit.
(Refer page 14)
RAS-20CNHZ2
RAS-30CNHZ2

–12 –
INDOOR UNIT INDICATORS
OPERATION INDICATOR
AUTO RESTART SWITCH
●In the event of power failure, the air conditioner will restart automatically
in the previously selected mode once the power is restored.
●In the event of power failure during TIMER operation, the timer will be
reset and the unit will begin or stop operating under a new timer setting.
NORMAL
Use this switch in order to prevent the unit from switch ON after the power
supply resuming from the power failure.
SELECTOR SWITCH IS PRESET AT NORMAL POSITION.
NORMAL TEMPORARY
/AUTO
RAS-20CNHZ2
TEMPORARY SWITCH
Use this switch to start and stop when the remote controller does not work.
●By setting the temporary switch, the operation is done in previously set
operation mode.
●When the operation is done using the temporary switch after the power
source is turned off and turn on again, the operation is done in automatic
mode.
OPERATION LAMP
This lamp lights during operation.
The OPERATION LAMP flashes in the following cases
during heating.
(1) During preheating
For about 2–3 minutes after starting up.
(2) During defrosting
Defrosting will be performed about 50 minutes when
frost forms on the heat exchanger of the outdoor
unit, for 5–10 minutes each time.
TIMER LAMP
This lamp lights when the timer is working.
SIGNAL RECEIVER
There will be a beep sound when this receiver receives
signal from remote controller.
CAUTION
1. Turn on the circuit breaker first before switching the auto restart switch to
AUTO. Failure to do so may result the unit to run at previous preset mode or
cannot operate.
2. Operation of indoor units are as mentioned on page 10 “Combination of
Operations. (Priority of operation is for unit no. 2)
!
Indoor unit 1Indoor unit 2
Outdoor unit

–13 –
INDOOR UNIT INDICATORS
OPERATION INDICATOR
RAS-30CNHZ2
TEMPORARY SWITCH
Use this switch to start and stop when the remote controller does not work.
SELECTOR SWITCH
AUTO RESTART SWITCH
●In the event of power failure, the air conditioner will restart automatically in
the previously selected mode once the power is restored.
●In the event of power failure during TIMER operation, the timer will be reset
and the unit will begin or stop operating under a new timer setting.
NORMAL
Use this switch in order to prevent the unit from switch ON after the power
supply resuming from the power failure.
SELECTOR SWITCH IS PRESET AT NORMAL POSITION.
NORMAL AUTO
RESTART
TEMPORARY
SWITCH
OPERATION LAMP
This lamp lights during operation.
The OPERATION LAMP flashes in the following cases
during heating.
(1) During preheating
For about 2–3 minutes after starting up.
(2) During defrosting
Defrosting will be performed about 50 minutes when
frost forms on the heat exchanger of the outdoor unit,
for 5–10 minutes each time.
FILTER LAMP
When the device is operated for a total of about 100 hours,
the FILTER lamp lights to indicate that it is time to clean
the filter. The lamp goes out when the POWER SWITCH
set to OFF and ON again.
SIGNAL RECEIVER
There will be a beep sound when this receiver receives
signal from remote controller.
TIMER LAMP
This lamp lights when the timer is working.
CAUTION
1. Turn on the circuit breaker first before switching the auto restart switch to
AUTO. Failure to do so may result the unit to run at previous preset mode or
cannot operate.
2. Operation of indoor units are as mentioned on page 10 “Combination of
Operations. (Priority of operation is for unit no. 2)
!
Indoor unit 1Indoor unit 2
Outdoor unit

–14 –
AUTO
HEAT
DEHUMIDIFY
COOL
FAN
FAN SPEED
LOW
MED
HI
SLEEPING
STOP (CANCEL)
START (RESERVE)
START/STOP
TIME
TIMER SET
TIMER SELECTOR
ON TIMER
OFF TIMER
AUTO SWING
˚CH
RESET
˚CH
NAMES AND FUNCTIONS OF REMOTE CONTROL UNIT
REMOTE CONTROLLER
This controls the operation of the indoor unit. The range of control is about 7 meters. If indoor lighting
is controlled electronically, the range of control may be shorter.
This unit can be fixed on a wall using the fixture provided. Before fixing it, make sure the indoor unit can
be controlled from the remote controller.
●Signal emitting window/transmission sign
Point this window toward the indoor unit when controlling it.
The transmission sign blinks when a signal is sent.
●Display
This indicates the room temperature selected, current time, timer status,
function and intensity of circulation selected.
●START/STOP button
Press this button to start operation. Press it again to stop operation.
●SLEEP button
Use this button to set the sleep timer.
●TEMPERATURE buttons
Use these buttons to raise or lower the temperature setting. (Keep pressed,
and the value will change more quickly.)
●TIME button
Use this button to set and check the time and date.
●RESET buttons
●FUNCTION selector
Use this button to select the operating mode. Every time you press it,
the mode will change from (AUTO) to (HEAT) to (DEHUMIDIFY) to
(COOL) and to (FAN) cyclically.
●FAN SPEED selector
This determines the fan speed. Every time you press this button, the intensity
of circulation will change from (AUTO) to (HI) to (MED) to (LOW)
(during the (FAN) mode, from HI to MED to LOW).
●AUTO SWING button
Controls the angle of the horizontal air deflector.
●TIMER control
Use this button to set the timer.
●OFF-TIMER button Select the turn OFF time.
●ON-TIMER button Select the turn ON time.
●RESERVE button Time setting reservation.
●CANCEL button Cancel time reservation.
Precautions for Use
●Do not put the remote controller in the following places.
●In direct sunlight.
●In the vicinity of a heater.
●Handle the remote controller carefully. Do not drop it on the floor,
and protect it from water.
●Once the outdoor unit stops, it will not restart for about 3 minutes
(unless you turn the power switch off and on or unplug the power
cord and plug it in again).
This is to protect the device and does not indicate a failure.
●If you press the FUNCTION selector button during operation, the
device may stop for about 3 minutes for protection.

–15 –
AUTOMATIC OPERATION
The device will automatically determine the mode of operation, HEAT, COOL or DEHUMIDIFY depending on
the initial room temperature. The selected mode of operation will not change when the room temperature
varies.
■As the settings are stored in memory in the remote controller, you only have
to press the (START/STOP) button next time.
Press the FUNCTION selector so that the display indicates the (AUTO)
mode of operation.
●When AUTO has been selected, the device will automatically determine
the mode of operation, HEAT, COOL or DEHUMIDIFY depending on
the initial room temperature.
Press the (START/STOP) button.
Operation starts with a beep.
Press the button again to stop operation.
You can raise or lower the temperature setting as necessary by maximum of
3°C.
Press the temperature button and the temperature setting
will change by 1°C each time.
●The preset temperature and the actual room temperature may vary
somewhat depending on conditions.
●The display does not indicate the preset temperature in the AUTO mode.
If you change the setting, the indoor unit will produce a beep.
1
START
STOP
°C
RESET
Over 27°C COOL
23~27°C
Under 23°C HEAT
Temperature settingFunction
27°C
23°C
Slightly lower than the
room temperature LOW
FAN SPEED
HI at start, MED or LOW
after the preset temperature
is reached
HI at start, MED or LOW
after the preset temperature
is reached
--
DEHUMIDIFY
-
Initial room temperature
(approx.)
■Condition of Automatic Operation

–16 –
HEATING OPERATION
●Use the device for heating when the outdoor temperature is under 21°C.
When it is too warm (over 21°C), the heating function may not work in order to protect the device.
Press the FUNCTION selector so that the display indicates
(HEAT).
Set the desired FAN SPEED with the (FAN SPEED) button
(the display indicates the setting).
(AUTO): The fan speed is HI at first and varies to MED
automatically when the preset temperature has
been reached.
(HI) : Economical as the room will become warm
quickly.
But you may feel a chill at the beginning.
(MED) : Quiet.
(LOW) : More quiet.
Set the desired room temperature with the TEMPERATURE
buttons (the display indicates the setting).
The range of 18-22°C is recommended as the
room temperature for heating.
If the temperature setting is 20°C, the room
temperature will be controlled at around 20°C.
The temperature setting and the actual room temperature may
vary somewhat depending on conditions.
Press the (START/STOP) button. Heating operation starts
with a beep. Press the button again to stop operation.
■As the settings are stored in memory in the remote controller, you only
have to press the (START/STOP) button next time.
1
2
3
START
STOP
˚C
RESET
˚C

–17 –
Set the desired room temperature with the TEMPERATURE
button (the display indicates the setting).
The range of 20-26˚C is recommended as the
room temperature for dehumidifying.
DEHUMIDIFYING OPERATION
Use the device for dehumidifying when the room temperature is over 16°C.
When it is under 15°C, the dehumidifying function will not work.
Press the (START/STOP) button. Dehumidifying operation
starts with a beep. Press the button again to stop operation.
2
■Dehumidifying Function
When the room temperature is higher than the temperature setting: The device will dehumidify the room,
reducing the room temperature to the preset level.
When the room temperature is lower than the temperature setting: Dehumidifying will be performed at
the temperature setting slightly lower than the current room temperature, regardless of the temperature
setting. The function will stop (the indoor unit will stop emitting air) as soon as the room temperature
becomes lower than the setting temperature.
■As the settings are stored in memory in the remote controller, you only
have to press the (START/STOP) button next time.
START
STOP
Press the FUNCTION selector so that the display indicates
(DEHUMIDIFY).
The FAN SPEED is set at LOW automatically.
The FAN SPEED button does not work.
1
RESET
˚
C

–18 –
˚C
RESET
˚C
COOLING OPERATION
Use the device for cooling when the outdoor temperature is 22-42°C.
If humidity is very high (over 80°C) indoors, some dew may form on the air outlet grille of the indoor unit.
Press the FUNCTION selector so that the display indicates
(COOL).
Set the desired FAN SPEED with the (FAN SPEED) button
(the display indicates the setting).
(AUTO): The FAN SPEED is HI at first and varies to
MED automatically when the preset temperature
has been reached.
(HI) : Economical as the room will become cool
quickly.
(MED) : Quiet.
(LOW) : More quiet.
Press the (START/STOP) button. Cooling operation starts
with a beep. Press the button again to stop operation. The
cooling function does not start if the temperature setting is
higher than the current room temperature (even though the
(OPERATION) lamp lights). The cooling function will start as
soon as you set the temperature below the current room
temperature.
Set the desired room temperature with the TEMPERATURE
button (the display indicates the setting).
The range of 25-28°C is recommended as the
room temperature for cooling.
If the temperature setting is 27°C, the room
temperature will be controlled at around 27°C.
The temperature setting and the actual room temperature may
vary somewhat depending on conditions.
■As the settings are stored in memory in the remote controller, you
only have to press the (START/STOP) button next time.
1
2
START
STOP
3

–19 –
* Note •In the fan operation mode, only display of FAN SPEED
setting will change by pressing FAN SPEED button; the
actual fan speed cannot be changed directly from HI to
LOW mode.
FAN SPEED (AUTO) ..... When the AUTO fan speed mode is set in the cooling/heating operation:
For the heating operation
●The fan speed will automatically change according to the temperature
of discharged air.
●When the difference of room temperature and setting temperature is
large, fan starts to run at HI speed.
●When the room temperature reaches setting temperature, fan speed
changes to LOW automatically.
●When the difference of room temperature and setting temperature is
large, fan starts to run at HI speed.
●After room temperature reaches the preset temperature, the cooling
operation, which changes the fan speed and room temperature to obtain
optimum conditions for natural healthful cooling will be performed.
For the cooling operation
FAN OPERATION
You can use the device simply as an air circulator. Use this function to dry the interior of the indoor
unit at the end of summer.
Press the FUNCTION selector so that the display indicates
(FAN).
Press the (FAN SPEED) button.*
Press the (START/STOP) button. Fan operation starts with
a beep. Press the button again to stop operation.
1
2
START
STOP
RESET