Hitachi RAS-07CH1 User manual

(W)
(A)
(kW)
(B.T.U./h)
(W)
(A)
(KW)
(BTU/H)
W
H
D
TOTAL INPUT
TOTAL AMPERES
CAPACITY
TOTAL INPUT
TOTAL AMPERES
CAPACITY
TYPE
MODEL
POWER SOURCE
COOLING
HEATING
DIMENSIONS
NET WEIGHT
NO. 0079E
SERVICE MANUAL
PM
TECHNICAL INFORMATION
FOR SERVICE PERSONNEL ONLY
1 Ø, 220 – 240 V, 50 Hz
680 – 730 870 – 925
3.2 – 3.1 4.1 – 4.1
2.05 – 2.05 2.50 – 2.50
7,000 – 7,000 8,500 – 8,500
630 – 685 860 – 920
3.0 – 2.9 4.0 – 4.0
2.30 – 2.30 2.94 – 3.00
7,850 – 7,850 10,000 – 10,200
785 700 785 700
265 570 265 570
168 210 168 210
726726
SPECIFICATIONS
CONTENTS
SPECIFICATIONS ------------------------------------------------------------------- 5
CONSTRUCTION AND DIMENSIONAL DIAGRAM ----------------------- 6
NAMES AND FUNCTIONS OF EACH PART ------------------------------- 7
MAIN PARTS COMPONENT --------------------------------------------------- 20
WIRING DIAGRAM ----------------------------------------------------------------- 22
WIRING DIAGRAM OF THE PRINTED WIRING BOARD ------------- 24
BASIC MODE ------------------------------------------------------------------------ 31
DESCRIPTION OF MAIN CIRCUIT OPERATION ------------------------ 35
AUTO SWING FUNCTION ------------------------------------------------------ 40
SERVICE CALL Q & A ----------------------------------------------------------- 41
DIAGNOSIS CHART FOR BREAK-DOWN --------------------------------- 46
REFRIGERATION CYCLE ------------------------------------------------------- 56
PARTS LIST AND DIAGRAM --------------------------------------------------- 57
RAS-07CH1
RAS-09CH1
RAC-07CHV1
RAC-09CHV1
RAS-07CH1/RAC-07CHV1
RAS-09CH1/RAC-09CHV1
REFER TO THE FOUNDATION MANUAL
COOLING UNIT
RAS-07CH1
CONDENSING UNIT
RAC-07CHV1
WALL TYPE
(mm)
(kg)
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
ROOM AIR CONDITIONER
COOLING UNIT + CONDENSING UNIT
NOVEMBER 1997 H.A.P.M.
COOLING UNIT
RAS-09CH1
CONDENSING UNIT
RAC-09CHV1

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.
– 1 –

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
– 2 –

(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
– 3 –

– 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. If the room air conditioner is stopped by setting the temperature or mis-operation, and then re-started in a
moment, cooling 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.
4. This room air conditioner should not be used at the cooling operation when the outside temperature is below
20°C.
5. When the operation knob is set to “COOL” from another position, IC delay circuit functions and stops the
compressor for the first 3 minutes, which is not an abnormal phenomenon.
CAUTION

RAC-09CHV1
20 W
1.5 µF, 400 V
YES (INTERNAL)
G533QB9Z
30 µF, 400 V
YES
YES
3.15A
G4A
NO
NO
YES
NO
450NR
NO
NO
NO
MODEL
FAN MOTOR
FAN MOTOR CAPACITOR
FAN MOTOR PROTECTOR
COMPRESSOR
COMPRESSOR MOTOR CAPACITOR
OVERLOAD PROTECTOR
OVERHEAT PROTECTOR
FUSE (for MICRO COMPUTER)
POWER RELAY, STICK RELAY
POWER SWITCH
TEMPORARY SWITCH
SERVICE SWITCH
TRANSFORMER
VARISTOR
NOISE SUPPRESSOR
REMOTE CONTROL SWITCH (LIQUID CRYSTAL)
THERMOSTAT
FUSE CAPACITY
RAS-09CH1
20 W
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
NO
NO
NO
NO
YES
YES (IC)
SPECIFICATIONS
10 A TIME DELAY FUSE
---------- ❈ 630g
UNIT
PIPES
❈630g for piping set of 5~8m.
❈670g for piping set of 5~8m.
REFRIGERANT
CHARGING VOLUME
(Refrigerant 22)
WITHOUT REFRIGERANT BECAUSE COUPLING IS FLARE
TYPE.
P - 105 VK1 (5m), P - 108 VK1 (8m)
– 5 –
RAC-07CHV1
20 W
1.5 µF, 400 V
YES (INTERNAL)
G333DB2Z
30 µF, 400 V
YES
YES
3.15A
G4A
NO
NO
YES
NO
450NR
NO
NO
NO
RAS-07CH1
20 W
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
NO
NO
NO
NO
YES
YES (IC)
---------- ❈ 670g

CONSTRUCTION AND DIMENSIONAL DIAGRAM
MODEL RAS-07CH1, RAS-09CH1
MODEL RAC-07CHV1, RAC-09CHV1
88.5
Hole on the wall
for ø65mm pipe
Connecting cable
Line cord
Mounting
plate
Air suction grill
6.5
43
60
47
Discharge grill
785
Vertical air deflector
785
Top Air suction grill
Horizontal air deflector
P
77
60
6.5
Front cover
168 10
47
Cabinet
62
15
Wireless remote controller
120
265
About 340
About 430
About
400
VIEWED FROM BACK
VIEWED FROM BACK
(PIPE LEAD-OUT)
167.5 450 (167.5)
92 58 58
Drain outlet
Drain hose Drain pan
25
43
Narrow pipe (ø6.35)
Narrow pipe (ø6.35)
Wide pipe (ø9.52)
Wide pipe (ø9.52)
55.5
Drain cap connection part
When piping is drawn
When piping is drawn
horizontally, exchange
the drain hose for the
drain cap.
Air outlet
Handle
Air inlet
(18)
490
Handle
Viewed from P
157
245 225
8
10
500
35
12
16
55
570
428
700
243
53 236
210 10 482
517
135
75
77
HITACHI
P
–6 –

MODEL
RAS-07CH1, RAS-09CH1
RAC-07CHV1, RAC-09CHV1
CONDENSING UNIT
WIDTH (mm)
785
700
HEIGHT (mm)
265
570
DEPTH (mm)
168
210
MODEL NAME AND DIMENSIONS
NAMES AND FUNCTIONS OF EACH PART
AIR FILTER
To prevent dust from coming into the indoor unit.
(Refer page 17)
POWER PLUG (NOT PROVIDED)
SUCTION GRILL (AIR INLET).
COOLING UNIT INDICATORS
Light indicator showing the operating condition.
(Refer page 8)
HORIZONTAL DEFLECTOR ●VERTICAL
DEFLECTOR (AIR OUTLET)
(Refer page 14)
REMOTE CONTROL
Send out operation signal to the indoor unit. So as to
operate the whole unit.
(Refer page 9)
DRAIN PIPE
Condensed water drain to outside.
CONNECTING CORD
AIR INLET (BACK, LEFT SIDE)
AIR OUTLET
Blow out warm air.
EARTH WIRE SCREW
RAS-07CH1, RAS-09CH1
RAC-07CHV1, RAC-09CHV1
COOLING UNIT
–7 –

RAS-
RAS-
Temporary Switch
Non-conductor Stick
Press
about 7mm
COOLING UNIT INDICATORS
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.
POWER SWITCH
OPERATION INDICATOR
OPERATION LAMP
This lamp lights during operation.
TIMER LAMP
This lamp lights when the timer is working.
SIGNAL RECEIVER
There will be a beep sound when this receiver receive
signal from remote controller.
–8 –

NAMES AND FUNCTIONS OF REMOTE CONTROL UNIT
■This controls the operation function and timer setting of the room air conditioner. The range of
control is about 4 meters. If indoor lighting is controlled electronically, the range of control may be
shorter.
Precautions for Use
●Do not put the remote controller in direct
sunlight and high temperature.
●Do not drop it on the floor, and protect
it from water.
●If you press the FUNCTION selector
button during operation, the air
conditioner may stop for about 3 minutes
for protection before you can start it
again. (unless you turn off and on again
the power source)
You can use the remote controller by fixing it on the
wall with the accessory parts.
●Before fixing it,
make sure the
unit can be
controlled by the
remote control
unit at the fixing
position.
REMOTE
CONTROLLER
HOLDER
CANCEL Button
Cancel timer reservation.
Signal Transmission
˚
ON/OFF Button
Press this button to start operation.
Press it again to stop operation.
FUNCTION Button
Select the operation mode.
(Page 12)
DEHUMIDIFY Button
Dehumidify mode direct selection.
(Page 11)
Reserve Button
Timer setting reservation.
OFF TIMER Button
Select the turn OFF time.
ON TIMER Button
Select the turn ON time.
Transmission Sign
The transmission sign blinks
when a signal has been send.
TEMPERATURE Button
Room temperuture setting.
Value will change more quickly
when keep pressing.
(Page 12)
FAN SPEED Button
Select the fan speed for
cooling and circulation mode.
(Page 12)
AUTO SWING Button
Control the angle of the
horizontal air deflector.
( Page 14)
–9 –

Press the (START/STOP) button
●Operation start with a “beep”.
Press the (START/STOP) button
●Please make sure you have been selected the (Automatic) mode
by use the (FUNCTION) Button.
●The fan speed selector does not work at this operation.
STOP
Press the (ROOM TEMPERATURE) button
●Temperature setting change by 1°C for each 1 time press.
Up
Down
●You can raise or lower the temperature setting by a maximum of
3°C.
●The display does not indicate the preset temperature in the Automatic
mode. Device will receive the setting by a “beep”.
AUTOMATIC OPERATION
■The device will automatically determine the operation mode either HEAT, COOL or DEHUMIDIFY,
depending on the initial room temperature.
1
■You can slightly adjust the room temperature.
1
▲ ▲
●The selected mode of operation will not change during the operation even though the room
temperature change.
■CONDITION OF AUTOMATIC OPERATION
Over 27°C COOL
23 ~ 27°C
FUNCTION
27°C
Slightly lower than the
room temperature LOW
FAN SPEED
HIGH at start, LOW after
the preset temperature is
reached
DEHUMIDIFY
INITIAL ROOM
TEMPERATURE (APPROX.)
TEMPERATURE
SETTING
Under 23°C HEAT 23°C
HIGH at start, MED or
LOW after the preset
temperature is reached
–10 –

ENERGY SAVE DEHUMIDIFYING OPERATION
■Use the device for dehumidifying when the room temperature is over 16°C.
1
Press the (DEHUMIDIFY) button
●Operation start with a “beep”sound.
Press the (START/STOP) button
●When you want to change the operation mode, please use the
(FUNCTION) Button.
●Set the desired temperature is available.
●You also can use the function mode button to select this operation.
HEATING OPERATION
■Use the device for heating when the outdoor temperature is under 21°C.
1
Press the (START/STOP) button
●Operation start with a “beep”sound.
Press the (START/STOP) button
●Make sure the (Heat) mode have been selected by using
the (FUNCTION) button.
●You can select the fan speed and desired temperature.
●The range of 18-20°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.
●As the settings are stored in memory of the remote controller, you
only have to press the (START/STOP) button next time.
STOP
Auto Fresh Defrosting will work in the following cases:
Auto Fresh Defrosting will start when even heating operation has stopped with the (START/STOP)
button pressed, during the off-timer operates or when the outdoor heat exchanger is cold. This defrosting
will last for 5-10 minutes.
STOP
–11 –

MANUAL OPERATION [Heating ●Dehumidify ●Cooling]
■Please use under below condition when you want to set the function mode, room temperature and
fan speed by manually.
1
OPERATION MODE SELECTION
●Every time you press the button, the mode will change as the below
sequence
(Auto) [(Heat) [(Dehumidify) [(Cool)
2
ROOM TEMPERATURE SETTING
Up
Down
●The cooling operation does not start if the
temperature setting is higher than the current
room temperature.
3
FAN SPEED SETTING
●Every time you press the button, fan speed will change as the
below sequence.
●HEATING & COOLING
CIRCULATION
●DEHUMIDIFY : QUIET (FIXED)
4
Press the (START/STOP) button
●Operation start with a signal received sound “beep”.
Press the (START/STOP) button
●As the settings are stored in memory in the remote control unit, you
only have to press the (Start/Stop) button next time.
HEATING
Outdoor Temperature
21°C below
DEHUMIDIFYING
Room Temperature
16°C above
COOLING
Outdoor Temperature
22-42°C
Heating 18~20°C
Dehumidify 16~26°C
Cooling 25~28°C
■Recommend Temperature
}:AUTO [HIGH [LOW [QUIET
▲ ▲
STOP
–12 –

Hr.
TIMER RESERVATION
■ON Timer and OFF Timer are available.
1
OFF TIME setting
●Select the OFF TIME by pressing the (OFF)
Button.
●Setting time will change according to the below
sequence when you press the button.
●The value change more quickly if you keep pressing
the button.
OFF Timer Reservation
■Operation stop at setting time
2
Press the (Reserve) button
●OFF TIMER reserved with a signal received sound
“beep”.
●The (OFF) Mark starts lighting instead of blinding.
1
ON TIME setting
●Select the ON TIMER by pressing the (ON)
Button.
●At the beginning of setting, time 6 hours was set.
●Setting time will change according to the below
sequence.
●The value change more quickly if you keep pressing
the button.
ON Timer Reservation
1
Press the (Cancel) button
●As the time settings are stored in remote controller
memory, you only have to press the (Reserve)
button in order to use the same setting next time.
CANCELLATION of Timer Reservation
2
Press the (Reserve) button
●ON TIMER reserved with a signal received sound
“beep”.
●The (ON) Mark starts lighting instead of blinding.
■Operation will start for setting
temperature at setting time (The starting
time may different depend on the room
temperature and set temperature).
0.5 1.0 1.5 9.5 10 11 12
0.5 hour interval 1 hour interval
0.5 1.0 1.5 9.5 10 11 12
0.5 hour interval 1 hour interval
Hr.
Hr.
Hr.
–13 –

RAS-
Temporary Switch
TEMPORARY SWITCH
POWER SWITCH
Non-conductor Stick
Press
about 7mm
Push and pull to the
direction of arrow
ADJUSTING THE AIR DEFLECTOR
1
Adjustment of the conditioned air in the upward and downward
directions.
According to “Dehumidifying”or “Cooling”operation, the
horizontal air deflector is automatically set to the proper angle
suitable for each operation. The deflector can be swung up and
down and also set to the desired angle using the “(AUTO
SWING)”button. (If the angle of the deflector is changed, it will
not return to the auto-set position after operations start unless
the operation mode is switched.)
2
Adjustment of the conditioned air to the left and right.
Hold the vertical air deflector as shown in the figure and adjust
the conditioned air to the left and right.
HOW TO EXCHANGE THE BATTERIES IN THE REMOTE CONTROLLER
●If the “(AUTO SWING)”button is pressed once, the
horizontal air deflector swings up and down. If the button
is pressed again, the deflector stops in its current position.
Several seconds (about 12 seconds) may be required
before the deflector starts to move.
●In “Cooling”operation, do not keep the horizontal air
deflector swinging for a long time. Some dew may form on
the horizontal air deflector and some dew drops may fall
from it.
1
Remove the cover as shown in the figure and take out the old
batteries.
=
2
Install the new batteries.
The direction of the batteries should match the marks in the case.
1. Do not use new and old batteries, or different kinds of batteries
together.
2. Take out the batteries when you do not use the remote controller
for 2 or 3 months.
CAUTION
Use the temporary switch when operation can not be done with
the remote controller.
1. 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 is turned on again, the
operation is done in automatic mode.
TEMPORARY SWITCH
–14 –

– 15 –
THE IDEAL WAYS OF OPERATION
Suitable Room Temperature Install curtain or blinds
Ventilation Effective Usage Of Timer
Do Not Forget To Clean The Air Filter Please Adjust Suitable Temperature
For Baby And Children
Warning
Freezing temperature
is bad for health and a
waste of electric power.
It is possible to
reduce heat
entering the
room through
windows.
At night, please use the “sleep timer operation
mode”, together with your wake up time in the
morning. This will enable you to enjoy a
comfortable room temperature. Please use the
timer effectively.
Dusty air filter will reduce the air volume and
the cooling efficiency. To prevent from wasting
electric energy, please clean the filter every 2
weeks.
Please pay attention to the room temperature
and air flow direction when operating the unit
for baby, children and old folks who have
difficulty in movement.
(The ideal temperature
difference between
outdoor and indoor
is about ±5°C).
Caution
Do not close the room for a long period of
time. Occasionally open the door and windows
to allow the
entrance of
fresh air.

– 16 –
FOR USER’S INFORMATION
The Air Conditioner And The Heat Source In The Room
After Power Failure
Not Operating For A Long Time
When Lightning Occurs
Caution
If the amount of heat in the room is above the cooling
capability of the air conditioner (for example: more
people entering the room, using heating equipments
and etc.), the preset room temperature cannot be
achieved.
When the power is resumed after a power failure,
the indoor unit will still remain “OFF”. To operate the
unit, please press the “ON/OFF” button again.
When the indoor unit is not to be used for a long
period of time, please switch off the power from the
mains. If the power from mains remains “ON”, the
indoor unit still consumes about 4W in the operation
control circuit even if it is in “OFF” mode.
Warning
To protect the whole unit during lightning, please
stop operating the unit and remove the plug from the
socket.
Operate
After power
failure
OFF

–17 –
MAINTENANCE
Before the cleaning, stop operation and disconnect the power supply.
1. AIR FILTER
Clean the air filter, as it removes dust inside the room. In case the air filter is full of dust, the air flow
will decrease and the cooling capacity will be reduced. Further, noise may occur. Be sure to clean the
filter following the procedure below.
2. CLEANING OF FRONT COVER, ETC.
●Never use hot water (above 40°C),
benzine, gasoline, acid, thinner or
a brush, because they will damage
the plastic surface and the coating.
CAUTION
●Wipe it with a soft dry cloth.
●When it is excessively dirty, wipe
with a soft cloth soaked in
lukewarm water or neutral
detergent. Then wipe thoroughly
with a soft dry cloth.
●Wipe the remote controller
thoroughly with a soft dry cloth.
NOTE:
●This model has an air cleaning filter. The cooling
capacity is slightly weakened and the cooling speed
becomes slower when the air cleaning filter is used.
So, set the fan speed to “HIGH”when using it in this
condition.
●Recommended to replace the air cleaning filter after
every 3 months for normal usage. Type number for this
air cleaning filter is <SPX-CFH3>. Please use this
number for ordering when you want to renew it.
Set the filter with “FRONT”mark facing
front, and slot in them to the original
state.
●Do not wash with hot water at more than 40°C. The
filter may shrink.
●When washing it, shake off moisture completely and
dry it in the shade; do not expose it directly to the
sun. The filter may shrink.
●Do not operate the air conditioner with the filter
removed. Dust may enter the air conditioner and
cause trouble.
CAUTION
1. Remove dust from the filter using a vacuum cleaner.
If there is too much dust, use neutral detergent.
After using neutral detergent, wash with clean water
and dry in the shade.
2. Install the filters.
(Set them with “FRONT”
mark facing front.)
Slot in the filter to the original state.
REMOVING METHOD
1. Press the “(AUTO SWING)”
button, let the deflector facing
downward.
2. Remove the filter from the lower side
as the arrow shown.
INSTALLATION METHOD
CAUTION
B
E
N
Z
I
N
E
A
C
I
D
T
H
I
N
N
E
R
PROCEDURE

–18 –
3. MAINTENANCE AT BEGINNING OF LONG OFF PERIOD
●Running the unit setting the operation mode to
(FAN) and the fan speed to HI for about half a day
on a fine day, and dry the whole of the unit.
●Disconnect the power plug.
1
2
3
REGULAR INSPECTION
PLEASE CHECK THE FOLLOWING POINTS EVERY EITHER HALF YEARLY
OR YEARLY. CONTACT YOUR SALES AGENT SHOULD YOU NEED ANY
HELP.
Is the plug of power line firmly plugged into the socket?
(Please ensure no loose contact between them).
Is the earth line disconnected or broken?
Is the mounting frame seriously affected by rust and is the
outdoor unit tilted or unstable?
Air
Blow
Confirm

–19 –
AFTER SALE SERVICE AND WARRANTY
1WHEN ASKING FOR SERVICE, CHECK THE FOLLOWING POINTS.
When it does not operate
When it does not cool well
●Is the fuse all right?
●Is the voltage extremely high or low?
●Is the power switch “ON”?
●Is the air filter blocked with dust?
●Does sunlight fall directly on the condensing unit?
●Is the air flow of the condensing unit obstructed?
●Are the doors or windows opened, or is there any source of
heat in the room?
●Is the set temperature suitable?
CONDITION CHECK THE FOLLOWING POINTS
Notes
●In quiet operation or stopping the running, the following phenomena
may occassionally occur, but they are not abnormal for the operation.
(1) Slight flowing noise of refrigerant in the refrigerating cycle.
(2) Slight rubbing noise from the fan casing which is cooled and
then gradually warmed as operation stops.
●The odor will possibly be emitted from the room air conditioner because
the various odor, emitted by smoke, foodstuffs, cosmetics and so on,
sticks to it. So please clean the air filter and the evaporator regularly
to reduce the odor.
●Please contact your sales agent immediately if the air conditioner still fails to operate normally after the above
inspections. Inform your agent of the model of your unit, production number, date of installation. Please also
inform him regarding the fault.