Hitachi RAK-18NH6 User manual

NO. 0355E
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
ROOM AIR CONDITIONER
INDOOR UNIT
MARCH 2007 Refrigeration & Air-Conditioning Division
SERVICE MANUAL
PM
REFER TO THE FOUNDATION MANUAL
TECHNICAL INFORMATION
FOR SERVICE PERSONNEL ONLY
(W)
(A)
(kW)
(B.T.U./h)
(W)
(A)
(kW)
(B.T.U./h)
W
H
D
(kg)
DC INVERTER (WALL TYPE)
TYPE
MODEL
POWER SOURCE
TOTAL INPUT
TOTAL AMPERES
CAPACITY
TOTAL INPUT
TOTAL AMPERES
CAPACITY
DIMENSIONS
(mm)
NET WEIGHT
SPECIFICATIONS
CONTENTS
SPECIFICATIONS ----------------------------------------------------- 5
HOW TO USE -------------------------------------------------------- 14
CONSTRUCTION AND DIMENSIONAL DIAGRAM ------- 38
MAIN PARTS COMPONENT ------------------------------------- 39
WIRING DIAGRAM -------------------------------------------------- 40
CIRCUIT DIAGRAM ------------------------------------------------- 43
PRINTED WIRING BOARD LOCATION DIAGRAM ------- 45
BLOCK DIAGRAM --------------------------------------------------- 47
BASIC MODE --------------------------------------------------------- 49
REFRIGERATING CYCLE DIAGRAM ------------------------- 63
AUTO SWING FUNCTION ---------------------------------------- 65
DESCRIPTION OF MAIN CIRCUIT OPERATION --------- 66
SERVICE CALL Q & A -------------------------------------------- 71
PARTS LIST AND DIAGRAM ------------------------------------ 81
RAK-18NH6
RAK-25NH6
RAK-35NH6
RAK-50NH6
COOLING
HEATING
780
280
220
RAK-18NH6
RAK-25NH6
RAK-35NH6
RAK-50NH6
RAK-35NH6
1 PHASE, 50 Hz, 220-240V
REFER TO THE SPECIFICATION PAGE (6)
INDOOR UNIT
RAK-18NH6 RAK-25NH6
NOTE:
This manual describes only points that differ from
RAF-25, 35NH5, RAD-25, 35NH5, RAI-25, 35NH5
and RAM-55QH5 (PM No. 0312E) for items not
described in this manual.
9.59.0
HITACHI
DC INVERTER
TEMPORARY
SWITCH
9.5 9.5
RAK-50NH6

– 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.
DANGER
First, I must disconnect
the power cord plug
from the power outlet.

–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 running, 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 thermostat, 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 (14°F).
6. This room air conditioner (the reverse cycle) should not be used when the outside temperature is below
–15°C (5°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 –
SPECIFICATIONS
MODEL
FAN MOTOR
FAN MOTOR CAPACITOR
FAN MOTOR PROTECTOR
COMPRESSOR
COMPRESSOR MOTOR CAPACITOR
OVERLOAD PROTECTOR
OVERHEAT PROTECTOR
FUSE (for MICROPROCESSOR)
POWER RELAY
POWER SWITCH
TEMPORARY SWITCH
SERVICE SWITCH
TRANSFORMER
VARISTOR
NOISE SUPPRESSOR
THERMOSTAT
REMOTE CONTROL SWITCH (LIQUID CRYSTAL)
RAK-18NH6, RAK-25NH6, RAK-35NH6, RAK-50NH6
35W
NO
NO
–
NO
NO
NO
NO
NO
NO
YES
NO
NO
NO
NO
YES(IC)
YES
----------
WITHOUT REFRIGERANT BECAUSE
COUPLING IS FLARE TYPE.
UNIT
PIPES
REFRIGERANT CHARGING
VOLUME
(Refrigerant 410A)

–6 –
SPECIFICATION OF ROOM AIR CONDITIONER
RAK-18NH6, RAK-25NH6, RAK-35NH6, RAK-50NH6
RAM-55QH5
TYPE
MODEL
PHASE/VOLTAGE/FREQUENCY
COOLING
(ONE UNIT)
COOLING
(2 UNITS)
RAK-25NH5+RAK-35NH5
........RAM-55QH5
HEATING
(ONE UNIT)
HEATING
(2 UNITS)
RAK-25NH5+RAK-35NH5
........RAM-55QH5
AUTOMATIC AIR DEFLECTORS
FAN SPEED
LINE CORD
REMOTE CONTROL SWITCH
MAXIMUM LENGTH OF PIPING
DIMENSIONS
inches (mm)
NET WEIGHT (kg)
PACKING
inches (mm)
GROSS WEIGHT (kg)
FLARE NUT SIZE (SMALL/LARGE)
1.8 (1.00 - 2.50)
6,150 (3,415 - 8,536)
560 (200 - 750)
3.21
2.57 - 2.36
99
35
7.3
OUTDOOR UNIT
CAPACITY (kW)
(BTU/h)
TOTAL INPUT (W)
COP
TOTAL AMPERE (A)
POWER FACTOR (%)
SOUND LEVEL (INDOOR)
AIR FLOW VOLUME (Hi)
CAPACITY (kW)
(BTU/h)
TOTAL INPUT (W)
COP
TOTAL AMPERE (A)
POWER FACTOR (%)
SOUND LEVEL (OUTDOOR)
CAPACITY (kW)
(BTU/h)
TOTAL INPUT (W)
COP
TOTAL AMPERE (A)
POWER FACTOR (%)
SOUND LEVEL (INDOOR)
AIR FLOW VOLUME (Hi)
CAPACITY (kW)
(BTU/h)
TOTAL INPUT (W)
COP
TOTAL AMPERE (A)
POWER FACTOR (%)
SOUND LEVEL (OUTDOOR)
COOLING/HEATING
WALL TYPE
INDOOR UNIT RAK-18NH6 RAK-25NH6 RAK-35NH6
RAM-55QH5
1ø/ 220V~240V / 50Hz
5.0 (0.9 - 5.2)
17,070 (3,070 - 17,740)
1,780 (155 - 2,200)
2.81
8.14 - 7.50
99
47
13.5
2.5 (1.00 - 3.10)
8,540 (3,415 - 10,585)
750 (200 - 880)
3.33
3.44 - 3.16
99
38
8.5
5.40 (1.50 - 5.90)
18,430 (5,120 - 20,130)
1,795 (200 - 1,980)
3.01
8.30 - 7.60
99
52
2.5 (1.10 - 3.20)
8,540 (3,756 - 10,927)
690 (200 - 970)
3.62
3.17 - 2.90
99
36
7.3
6.50 (0.9 - 8.1)
22,180 (3,070 - 27,640)
1,970 (155 - 2,100)
3.30
9.00 - 8.30
99
4.7
13.5
3.4 (1.10 - 4.40)
11,610 (3,756 - 15,024)
870 (200 - 1,120)
3.91
3.99 - 3.66
99
39
8.5
7.2 (1.50 - 7.20)
24,560 (5,120 - 24,560)
2,100 (200 - 2,100)
3.43
9.6 - 8.8
99
52
YES
4
YES
4
YES
4
NOT PROVIDED (POWER CORD SHOULD BE PREPARED AND CONNECTED TO
OUTDOOR UNIT WHEN INSTALLED)
YES (WIRELESS) YES (WIRELESS)YES (WIRELESS)
MAX 35m (TWO UNITS TOTAL)
W
H
D
(INSTALLED)
W
H
D
cu.ft
30-23/32 (780)
11-1/32 (280)
8-35/50 (220)
–
32-11/16 (830)
9-27/32 (250)
12-31/32 (330)
2.41
9
6.35/9.52
RAK-50NH6
3.5 (1.00 - 4.00)
11,950 (3,415 - 13,658)
1,090 (200 - 1,300)
3.21
5.00 - 4.59
99
41
10.1
4.2 (1.10 - 5.00)
14,340 (3,756 - 17,072)
1,080 (200 - 1,300)
3.89
4.96 - 4.55
99
41
10.1
YES (WIRELESS)
YES
4
HITACHI
DC INVERTER
TEMPORARY
SWITCH
30-23/32 (780)
11-1/32 (280)
8-35/50 (220)
–
32-11/16 (830)
9-27/32 (250)
12-31/32 (330)
2.41
9
6.35/9.52
30-23/32 (780)
11-1/32 (280)
8-35/50 (220)
–
32-11/16 (830)
9-27/32 (250)
12-31/32 (330)
2.41
9
6.35/9.52
30-23/32 (780)
11-1/32 (280)
8-35/50 (220)
–
32-11/16 (830)
9-27/32 (250)
12-31/32 (330)
2.41
9
6.35/12.7

–7 –
DUAL SYSTEM MULTI R.A.C. RAM-55QH5
COOL / HEAT CAPACITY SPEC. FOR INDOOR UNITS
COMBINATIONS TO BE ABLE TO OPERATE SIMULTANEOUSLY
Whichever indoor units are installed, cooling and heating capacity depends on how many and which indoor units
are operating at that time.
POSSIBLE
COMBINATIONS
TO OPERATE
CAPACITY RATING
(kW)
(RANGE)
POWER
CONSUMPTION
(W)
AMPERE
(A)
220-240V
OUTDOOR UNIT
C O O L I N G
CAPACITY RATING
(kW)
(RANGE)
POWER
CONSUMPTION
(W)
AMPERE
(A)
220-240V
OUTDOOR UNIT
H E A T I N G
ONE UNIT
TWO UNIT
1.8
2.5
3.5
5.0
1.8+1.8
1.8+2.5
1.8+3.5
1.8+5.0
2.5+2.5
2.5+3.5
1.80
(1.00-2.50)
2.50
(1.00-2.80)
3.50
(1.00-3.90)
5.00
(1.00-5.60)
1.80+1.80
(1.50-4.00)
1.80+2.40
(1.50-4.60)
1.70+3.30
(1.50-5.60)
1.40+4.00
(1.50-5.90)
2.50+2.50
(1.50-5.60)
2.17+3.03
(1.50-5.70)
560
(200-750)
780
(200-980)
1160
(200-1280)
1780
(200-1960)
1190
(200-1300)
1310
(200-1450)
1650
(200-1820)
1795
(200-1980)
1650
(200-1820)
1730
(200-1900)
2.6-2.4
3.6-3.3
5.3-4.9
8.2-7.5
5.5-5.0
6.0-5.5
7.6-6.9
8.2-7.6
7.6-6.9
7.9-7.3
2.50
(1.10-3.20)
3.90
(1.10-4.70)
4.80
(1.10-5.80)
6.50
(1.10-7.20)
2.50+2.50
(1.50-5.20)
2.40+3.80
(1.50-6.30)
2.30+4.50
(1.50-7.20)
2.00+5.00
(1.50-7.20)
3.40+3.40
(1.50-7.20)
3.15+3.85
(1.50-7.20)
750
(200-1050)
1145
(200-1380)
1550
(200-1870)
2400
(200-2660)
1460
(200-1550)
1820
(200-1920)
1995
(200-2100)
2050
(200-2100)
2015
(200-2110)
2070
(200-2110)
3.4-3.2
5.3-4.8
7.1-6.5
11.0-10.1
6.7-6.1
8.4-7.7
9.2-8.4
9.4-8.6
9.3-8.5
9.5-8.7
ONE UNIT : The values indicated are only for one unit opration when two indoor units are connected.
3.5+3.5 2.70+2.70
(1.50-5.90)
1795
(200-1980) 8.2-7.6 3.60+3.60 (1.50-7.20)
2110
(200-2110) 9.7-8.9
2.5+5.0 1.80+3.60
(1.50-5.90)
1795
(200-1980) 8.2-7.6 2.70+4.50 (1.50-7.20)
2110
(200-2110) 9.7-8.9
RATING CONDITON (DRY BLUB / WET BULB)
COOLING
HEATING
INDOOR OUTDOOR
27 / 19 ˚C
20 / –˚C
35 / –˚C
7 / 6˚C

–8 –
DUAL SYSTEM MULTI R.A.C. RAM-55QH5
INDOOR UNITS COMBINATIONS TO BE ABLE TO INSTALL
Two indoor units can be installed with one outdoor unit.
And total nominal cooling capacity should not be more than 7.5kW
INDOOR UNIT
MODEL
NOMINAL
COOLING
CAPACITY
(kW)
CAPACITY (kW)
at one unit operation
SUITABLE ROOM SIZE (m2)
at one unit operation
COOLING HEATING COOLING HEATING
RAK-18NH5
RAK-25NH5
RAF-25NH5
RAD-25NH5
RAI-25NH5
RAK-35NH5
RAF-35NH5
RAD-35NH5
RAI-35NH5
1.8
2.5
2.5
2.5
2.5
3.5
3.5
3.5
3.5
1.00 - 2.50
1.00 - 2.80
1.00 - 2.80
1.00 - 2.80
1.00 - 2.80
1.00 - 3.90
1.00 - 3.90
1.00 - 3.90
1.00 - 3.90
1.10 - 3.20
1.10 - 4.70
1.10 - 4.70
1.10 - 4.70
1.10 - 4.70
1.10 - 5.80
1.10 - 5.80
1.10 - 5.80
1.10 - 5.80
8 - 12
11 - 17
11 - 17
11 - 17
11 - 17
16 - 24
16 - 24
16 - 24
16 - 24
9 - 11
14 - 18
14 - 18
14 - 18
14 - 18
17 - 22
17 - 22
17 - 22
17 - 22
Be sure to connect two indoor units to this outdoor unit. If not, condensed water may drop, resulting in trouble.
RAK-50NH5 5.0 1.00 - 5.60 1.10 - 7.20 23 - 34 23 - 29
RAF-50NH5 5.0 1.00 - 5.60 1.10 - 7.20 23 - 34 23 - 29
RAI-50NH5 5.0 1.00 - 5.60 1.10 - 7.20 23 - 34 23 - 29

–9 –
DUAL SYSTEM MULTI R.A.C. RAM-55QH5
CONNECTING POSISION TO BE ABLE TO INSTALL
POSSIBLE COMBINATIONS
TO INSTALL
(kW)
CONNECTING POSITION ON
OUTDOOR UNIT
(VALVE DIAMETER)
(mm)
No.1 No.2
SUITABLE ROOM SIZE
TO INSTALL
(m2)
6.35/9.52D 6.35/9.52D
TWO UNITS
1.8+1.8
1.8+2.5
1.8+3.5
1.8+5.0
2.5+2.5
2.5+3.5
(8-12) + (8-12)
(8-12) + (10-16)
(7-9) + (15-22)
(6-9) + (18-27)
(12-15) + (12-15)
(11-14) + (14-18)
1.8
1.8
1.8
1.8
2.5
2.5
1.8
2.5
3.5
5.0
2.5
3.5
2.5, 3.5, 4.0, 5.0 means indoor units cooling capacity class.
(1) Marking
: needs flare adapter (9.52 12.7D): Part No. TA261D-4 001
(2) Suitable room size is determined based on the conditions below:
•Climate is in the temperate zone like Tokyo, Japan.
•For usual residential use.
•Smaller figure is for light construction which means light thermally sealed.
•Larger figure is for heavy constructions, which means well thermally sealed.
3.5+3.5 (13-16) + (13-16) 3.5 3.5
2.5+5.0 (10-12) + (18-20) 2.5 5.0



–10 –

–11 –

–12 –

–13 –

– 14 –
!
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 insert a finger, a rod or other objects into the air outlet or inlet. As the
fan is rotating at a high speed, it will cause injury. Before cleaning, be sure
to stop the operation and turn the breaker OFF.
●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
!

– 15 –
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.
●This appliance is not intended for use by young children or infirm persons unless they have been
adequately supervised by a responsible person to ensure that they can use the appliance safely.
●Young children should be supervised to ensure that they do not play with the appliance.
●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.
●Do not use any aerosol or hair sprays near the indoor unit. This chemical
can adhere on heat exchanger fin and blocked the evaporation water flow
to drain pan. The water will drop on tangential fan and cause water splashing
out from indoor unit.

– 16 –
HITACHI
DC INVERTER
TEMPORARY
SWITCH
HITACHI
INDOOR UNIT
NAMES AND FUNCTIONS OF EACH PART
Air filter
To prevent dust from coming into the indoor unit.
(Refer page 31)
Front panel
Indoor unit indicators
Light indicator showing the operating condition.
(Refer page 15)
Horizontal deflector ●Vertical deflector
(Air Outlet)
(Refer page 26)
Remote controller
Send out operation signal to the indoor unit. So as to
operate the whole unit.
(Refer page 16)
WIDTH (mm)
780
MODEL
RAK-18NH6/RAK-25NH6/RAK-35NH6/RAK-50NH6
HEIGHT (mm)
280
DEPTH (mm)
220
MODEL NAME AND DIMENSIONS

–17 –
INDOOR UNIT INDICATORS
OPERATION INDICATOR
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.
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 once every one
hour 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.
TEMPORARY
SWITCH
TEMPORARY
SWITCH
Press
Temporary Switch
Non-conductor Stick
TEMPORARY SWITCH
Use this switch to start and stop when the remote controller does not work. [Use non-conductor stick
(example toothpick)]
●By pressing 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.

–18 –
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.
●Handle the remote controller with care. Dropping it or getting it wet may compromise its signal transmission capability.
●After new batteries are inserted into the remote controller, the unit will initially require approximately 10 seconds to
respond to commands and operate.
●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)
(This button allows selecting the optimal or preferred fan speed for each operation
mode).
●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.
●Under 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.

–19 –
RESET
AUTOMATIC OPERATION
The device will automatically determine the mode of operation, HEAT, COOL or DEHUMIDIFY depending on the current room
temperature. The selected mode of operation will change when the room temperature varies. However the mode of operation will
not change when indoor unit connected to multi type outdoor unit.
■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 current room temperature. However the mode of operation will
not change when indoor unit connected to multi type outdoor unit.
●If the mode automatically selected by the unit is not satisfactory,
manually change the mode setting (heat, dehumidify, cool or fan).
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
Press the (FAN SPEED) button, AUTO and LOW is available.
VARIOUS FUNCTIONS
■Auto Restart Control
●If there is a power failure, operation will be automatically restarted when the power is resumed with previous operation mode
and airflow direction.
(As the operation is not stopped by remote controller.)
●If you intend not to continue the operation when the power is resumed, switch off the power supply.
When you switch on the circuit breaker, the operation will be automatically restarted with previous operation mode and airflow
direction.
Note: 1. If you do not require Auto Restart Control, please consult your sales agent or OFF by remote control.
2. Auto Restart Control is not available when Timer or Sleep Timer mode is set.