Hitachi 0174E Service Manual

PM
NO. 0174E
RAK-25NH4/RAC-25NH4 RAK-35NH4/RAC-35NH4
SERVICE MANUAL
TECHNICAL INFORMATION
FOR SERVICE PERSONNEL ONLY
RAK-25NH4 RAK-35NH4 RAK-50NH4
RAC-25NH4 RAC-35NH4 RAC-50NH4
RAK-50NH4/RAC-50NH4
CONTENTS
SPECIFICATIONS ------------------------------------------------------------------- 5 HOW TO USE ------------------------------------------------------------------------ 6 CONSTRUCTION AND DIMENSIONAL DIAGRAM --------------------- 29 MAIN PARTS COMPONENT --------------------------------------------------- 31 WIRING DIAGRAM ---------------------------------------------------------------- 33 CIRCUIT DIAGRAM --------------------------------------------------------------- 35 PRINTED WIRING BOARD LOCATION DIAGRAM --------------------- 41 BLOCK DIAGRAM ----------------------------------------------------------------- 43 BASIC MODE ----------------------------------------------------------------------- 45 REFRIGERATING CYCLE DIAGRAM --------------------------------------- 59 AUTO SWING FUNCTION ------------------------------------------------------ 61 DESCRIPTION OF MAIN CIRCUIT OPERATION ----------------------- 62 SERVICE CALL Q & A ---------------------------------------------------------- 93 TROUBLE SHOOTING ----------------------------------------------------------- 96 PARTS LIST AND DIAGRAM ------------------------------------------------- 116
SPECIFICATIONS
TYPE
MODEL POWER SOURCE
TOTAL INPUT
COOLING
HEATING
DIMENSIONS (mm)
NET WEIGHT
TOTAL AMPERES
CAPACITY
TOTAL INPUT TOTAL AMPERES
CAPACITY
(W)
(A)
(kW)
(B.T.U./h)
(W)
(A)
(kW)
(B.T.U./h)
W
H D
(kg)
INDOOR UNIT
RAK-25NH4 RAC-25NH4
1 PHASE, 50 Hz, 220-230V
695 (155~1,050)
2.50 (0.90 ~ 3.00)
900 (115 ~ 1,400)
3.50 (0.90 ~ 5.00)
860 285 183
9.0
OUTDOOR UNIT
3.20-3.05
8,540
4.15-4.00
11,950
750 570 280
38
DC INVERTER (WALL TYPE)
INDOOR UNIT
RAK-35NH4 RAC-35NH4
1 PHASE, 50 Hz, 220-230V
1,080 (155~1,280)
3.50 (0.90 ~ 4.00)
1,320 (115 ~ 1,920)
4.80 (0.90 ~ 6.60)
860 285 183
9.0
OUTDOOR UNIT
4.94-4.72
11,950
6.04-5.77
16,390
750 570 280
38
INDOOR UNIT
RAK-50NH4 RAC-50NH4
1 PHASE, 50 Hz, 220-230V
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
OUTDOOR UNIT
1,780 (155~2,200)
8.17-7.82
5.00 (0.90 ~ 5.20) 17,070
1,970 (115 ~ 2,100)
9.04-8.65
6.50 (0.90 ~ 8.10) 22,200
860 285 183
9.0
After installation
850 650 298
60
MAY 2003
ROOM AIR CONDITIONER
INDOOR UNIT + OUTDOOR UNIT
Refrigeration & Air-Conditioning Division
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.
First, I must disconnect the power cord plug
from the power outlet.
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.
DANGER
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).
A conductive polyvinyl bag
IC
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.
IC
Conductive sponge
Body earth (Elimik conductive band)
1M
Fig. 2. Body Earth
Clip for connection with a grounding wire
– 2 –
(6) Use a three wire type soldering iron including a grounding wire.
Metal plate (of aluminium, stainless steel, etc.)
Staple
Bare copper wire (for body earth)
Fig. 3. Grounding of the working table
Working table
Resistor of 1 M (1/2W)
Earth wire
Soldering iron
2
Screw stop at the screwed part using a rag plate
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.
Grounding wire
– 3 –
CAUTION
!
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 (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.
– 4 –
SPECIFICATIONS
MODEL
RAK-25NH4 RAK-35NH4 RAK-50NH4
RAC-25NH4 RAC-50NH4RAC-35NH4
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
PWM DC35V
NO
NO
NO
NO
NO
NO
NO
NO
YES
40 W
NO
NO
JU1012D JU1013D
NO
YES
YES
3.0A
G4A
NO
NO
SERVICE SWITCH
TRANSFORMER
VARISTOR
NOISE SUPPRESSOR
THERMOSTAT
REMOTE CONTROL SWITCH (LIQUID CRYSTAL)
REFRIGERANT CHARGING VOLUME (Refrigerant 410A)
UNIT
PIPES (MAX. 20m)
NO
NO
NO
NO
YES(IC)
YES
----------
WITHOUT REFRIGERANT BECAUSE
COUPLING IS FLARE TYPE.
450NR
YES(IC)
1150g1150g
YES
NO
YES
NO
1400g
– 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.
!
!
Make sure to connect earth line.
Indicates the instructions that must be followed.
Please keep this manual after reading.
PRECAUTIONS DURING INSTALLATION
Do not reconstruct the unit. Water leakage, fault, short circuit or fire may occur if you reconstruct the unit by yourself.
!
WARNING
!
CAUTION
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.
The sign in the figure indicates prohibition.
W
A R N
N G
!
W
A R N
N
G
PRECAUTIONS DURING SHIFTING OR MAINTENANCE
Should abnormal situation arises (like burning smell), please stop operating the unit
!
I
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.
PRECAUTIONS DURING OPERATION
Avoid an extended period of direct air flow for your health.
Do not put objects like thin rods into the panel of blower and suction side because the high-speed fan inside may cause danger.
I
Do not use any conductor as fuse wire, this could cause fatal accident.
During thunder storm, disconnect and turn off the circuit breaker.
– 6 –
PRECAUTIONS DURING OPERATION
The product shall be operated under the manufacturer specification and not for any other intended use.
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.
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.
!
C A
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.
U T
I
O
Please switch off the unit and turn off the circuit breaker during cleaning, the high-speed fan inside the unit may cause danger.
N
Turn off the circuit breaker if the unit is not to be operated for a long period.
Do not climb on the outdoor unit or put objects on it.
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 place plants directly under the air flow as it is bad for the plants.
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.
– 7 –
NAMES AND FUNCTIONS OF EACH PART
INDOOR UNIT
Air filter
To prevent dust from coming into the indoor unit. (Refer page 25)
Front panel
Indoor unit indicators
Light indicator showing the operating condition. (Refer page 9)
Horizontal deflector (Air Outlet)
(Refer page 20)
Vertical deflector
MODEL NAME AND DIMENSIONS
MODEL
RAK-25NH4, RAK-35NH4, RAK-50NH4
Remote controller
Send out operation signal to the indoor unit. So as to operate the whole unit. (Refer page 10)
WIDTH (mm)
860
HEIGHT (mm)
295
DEPTH (mm)
183
– 8 –
INDOOR UNIT INDICATORS
HITACHI
FILTER LAMP
When the device is operated for a total of about 200 hours, the FILTER lamp lights indicates that it is time to clean the filter. The lamp goes out when the POWER SWITCH set to OFF and ON again.
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 an 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.
OPERATION INDICATOR
This figure shows the opening condition of
front panel. Refer to page 24 in relation to how to open or close the front panel.
TEMPORARY SWITCH
TEMPORARY SWITCH
Use this switch to start and stop when the remote controller does not work.
By pressing the temporary switch, the operation is done in automatic mode.
TEMPORARY SWITCH
– 9 –
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.
CH
˚
CH
˚
RESET
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
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.
– 10 –
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.
2. Auto Restart Control is not available when Timer or Sleep Timer mode is set.
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.
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.
1
If the mode automatically selected by the unit is not satisfactory, manually change the mode setting (heat, dehumidify, cool or fan).
RESET
START
STOP
Press the (START/STOP) button. 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.
You can raise or lower the temperature setting as necessary by maximum of 3°C.
°C
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.
Press the (FAN SPEED) button, AUTO and LOW is available.
Press the temperature button and the temperature setting will change by 1°C each time.
Condition of Automatic Operation
Initial room temperature (approx.)
Function
-
Over 27°C COOL
-
23~27°C
DEHUMIDIFY
-
Under 23°C
HEAT
Temperature setting
27°C
Slightly lower than the room temperature
23°C
– 11 –
FAN SPEED
HI at start, MED or LOW after the preset temperature is reached
LOW
HI at start, MED or LOW after the preset temperature is reached
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) : Fan speed slow. (LOW) : Fan speed slower.
RESET
C
˚
1
2
Set the desired room temperature with the TEMPERATURE buttons (the display indicates the setting).
3
C
˚
START
STOP
As the settings are stored in memory in the remote controller, you only
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.
have to press the (START/STOP) button next time.
– 12 –
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 FUNCTION selector so that the display indicates
(DEHUMIDIFY). The FAN SPEED is set at LOW automatically. The FAN SPEED button does not work.
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.
RESET
C
˚
1
2
C
˚
Dehumidifying Function
START
STOP
As the settings are stored in memory in the remote controller, you
Press the (START/STOP) button. Dehumidifying operation starts with a beep. Press the button again to stop operation.
only have to press the
(START/STOP) button next time.
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.
– 13 –
COOLING OPERATION
Use the device for cooling when the outdoor temperature is 22-42°C. If in doors humidity is very high (80%), some dew may form on the air outlet grille of the indoor unit.
Press the FUNCTION selector so that the display indicates
C
˚
1
(COOL).
RESET
Set the desired FAN SPEED with the (the display indicates the setting).
(AUTO): The FAN SPEED is HI at first and varies to
MED automatically when the preset temperature
2
(HI) : Economical as the room will become cool
(MED) : Fan speed slow. (LOW) : Fan speed slower.
Set the desired room temperature with the TEMPERATURE button (the display indicates the setting).
3
C
˚
START
STOP
The temperature setting and the actual room temperature may vary some how depending on conditions.
Press the 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.
has been reached.
quickly.
(START/STOP) button. Cooling operation starts
(FAN SPEED) button
As the settings are stored in memory in the remote controller, you
only have to press the
(START/STOP) button next time.
– 14 –
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
1
(FAN).
RESET
FAN SPEED (AUTO)
For the heating operation
2
START
STOP
.....
When the AUTO fan speed mode is set in the cooling/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.
Press the (FAN SPEED) button.
Press the (START/STOP) button. Fan operation starts with a beep. Press the button again to stop operation.
For the cooling operation
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.
– 15 –
HOW TO SET THE TIMER
RESET
Time, Day, Month
TIME, DAY, MONTH
After you change the batteries;
(current time, day, month)
OFF TIMER
ON TIMER
OFF-Timer
RESERVE CANCEL
You can set the device to turn off at the present time.
ON-Timer
The device will turn on
at the designated times.
Start
M D
STOP
Stop
Start
1
Set the current month and
day with the TIMER control button.
M D
1
Press the (OFF-TIMER)
button. The (OFF) mark blinks on the display.
AM
1
Press the (ON-TIMER)
button the (ON) mark blinks on the display.
AM
3
ON/OFF-Timer
Start Stop
The device will turn on (off) and off (on) at the designated times.
The switching occurs first at the preset time that comes earlier.
The arrow mark appearing on the display indicates the sequence of switching operations.
1
Press the (ON-OFF)
button so that the (OFF) mark blinks.
PM
2
Set the turn-off time
with the TIMER control button. Press the (RESERVE) button.
PM
Press the (ON-
TIMER) button so that the (OFF) mark lights and the (ON) mark blinks.
PM
AM
How to Cancel Reservation
Point the signal window of the remote controller toward the indoor unit, and press the (CANCEL) button. The (RESERVED) sign goes out with a beep and the (TIMER) lamp turns off on the indoor unit.
NOTE
You can set only one of the OFF-timer, ON-timer and ON/OFF-timer.
– 16 –
2
Press the
(TIME) button.
AM PM PM
2
Set the turn-off time with the
TIMER control button.
3
TIMER control button.
PM
Set the current time with the
Example: The current time is 1:30 p.m.
3
Point the signal window of the remote controller toward the indoor unit, and
press the (RESERVE) button. The (OFF) mark starts lighting instead of flashing and the sign (RESERVED) lights. A beep occurs and the (TIMER) lamp lights on the indoor unit.
4
Press the (TIME) button again.
The time indication starts lighting
instead of flashing.
The time indication will disappear
PM
To check the current time setting,
automatically in 10 second.
press the (TIME) button twice. The setting of the current time is
now complete.
2
Set the turn-on time with the
TIMER control button.
AM
4
Set the turn-on time with the
TIMER control button.
PM
AM
PM
The setting of turn-off time is now complete.
3
Point the signal window of the remote controller toward the indoor unit, and
press the (RESERVE) button. The (ON) mark starts lighting instead of flashing and the (RESERVED) sign lights. A beep occurs and the (TIMER) lamp lights on the indoor unit.
Example:
AM
5
Point the signal window of the remote controller toward the indoor unit, and
press the (RESERVE) button. The (ON) mark starts lighting instead of flashing and the (RESERVED) sign lights. A beep occurs and the (TIMER) lamp lights on the indoor unit.
PM
AM
The device will automatically turn on earlier so that the preset temperature can be reached at 7:00 a.m. The setting of the turn-on time is now complete.
Example: The device will turn off at 10:30 p.m. and then automatically turn on earlier so that the preset temperature can be reached at 7:00 a.m. The settings of the turn-on/off times are now complete.
Example: The device will turn off at 11:00p.m.
The timer may be used in three ways: off-timer, on-timer, and ON/OFF (OFF/ON)-timer. Set
the current time at first because it serves as a reference.
As the time settings are stored in memory in the remote controller, you only have to press
the (RESERVE) button in order to use the same settings next time.
– 17 –
HOW TO SET THE SLEEP TIMER
Set the current time at first if it is not set before (see the pages for setting the current time). Press the (SLEEP) button, and the display changes as shown below.
Mode
44 44
H
SLEEP
Sleep timer
Sleep Timer: The device will continue working for the designated number of hours and then turn off. Point the signal window of the remote controller toward the indoor unit, and press the SLEEP button. The timer information will be displayed on the remote controller. The TIMER lamp lights with a beep from the indoor unit. When the sleep timer has been set, the display indicates the turn-off time.
H
Sleep
timer
1
Set the ON-timer.
Start
1 hour 2 hours 3 hours 7 hours
The device will be turned off by the sleep timer and turned on by on-timer.
Indication
Sleep timer off
Example: If you set 3 hours sleep time at 11:38 p.m., the turn-off time is 2:38 a.m.
1
2
Press the (SLEEP) button and set the sleep timer.
AM
H
AM
For heating: In this case, the device will turn off
in 2 hours (at 1:38 a.m.) and turn on early so that the preset temperature will be almost reached at 6:00 next morning.
How to Cancel Reservation
Point the signal window of the remote controller toward the indoor unit, and press the (CANCEL) button. The (RESERVED) sign goes out with a beep and the (TIMER) lamp turns off on the indoor unit.
– 18 –
Explanation of the sleep timer
The device will control the FAN SPEED and room temperature automatically so as to be quiet and good for peoples health. You can set the sleep timer to turn off after 1, 2, 3 or 7 hours. The FAN SPEED and room temperature will be controlled as shown below.
Operation with the sleep timer
Function Operation
Heating
Cooling
and
dehumidifying
Fan
The room temperature will be controlled 5°C below the temperature and the FAN SPEED will be set to LOW setting 30 minutes after the setting of the sleep timer.
The room temperature will be
Sleep timer set
30 minutes later
2°C
2 hours later
1 hour later
controlled 2°C above the temperature and the FAN SPEED will be set to LOW setting 30 minutes after the setting of the sleep timer.
Sleep timer set
30 minutes later
2 hours later
6 hours later
3 hours later
The settings of room temperature and circulation are varied.
5°C
7 hours later
3 hours later
7 hours later
NOTE
If date or current time is not set, sleep timer can not be set.
If you set the sleep timer after the off-, on/off- or off/on-timer has been set, the sleep timer
becomes effective instead of the off-, on/off- or off/on-timer set earlier.
You can not set other timer during sleep timer operation.
After sleep timer time is up and when press sleep button again, the sleep timer will be set as
last setting.
Sleep timer effective only once.
19
ADJUSTING THE AIR DEFLECTOR
1
Adjustment of the conditioned air in the upward and downward directions.
The horizontal air deflector is automatically set to the proper angle suitable for each operation. The deflector can be swung up and down continuously and also set to the desired angle using the (AUTO SWING) button.
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 6 seconds) may be required before the deflector starts to move.
Use the horizontal air deflector within the adjusting range
shown on the right.
When the operation is stopped, the horizontal air deflector
moves and stops at the position where the air outlet closes.
RESET
2
CAUTION
!
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 dew may drop.
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.
When cooling dehumidifying
When heating
– 20 –
HOW TO EXCHANGE THE BATTERIES IN THE REMOTE CONTROLLER
Remove the cover as shown in the figure and take out the
1
old batteries.
=
Install the new batteries.
2
The direction of the batteries should match the marks in the case.
!
CAUTION
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.
Push and pull to the direction of arrow
– 21 –
THE IDEAL WAYS OF OPERATION
Suitable Room Temperature Install curtain or blinds
!
Warning
Freezing temperature is bad for health and a waste of electric power.
Ventilation Effective Usage Of Timer
It is possible to reduce heat entering the room through windows.
!
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.
Do Not Forget To Clean The Air Filter
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.
At night, please use the OFF or ON 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.
Please Adjust Suitable Temperature
For Baby And Children
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.
– 22 –
FOR USER’S INFORMATION
OFF
The Air Conditioner And The Heat Source In The Room
!
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.
Not Operating For A Long Time
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 8W in the operation control circuit even if it is in “OFF” mode.
When Lightning Occurs
!
Warning
To protect the whole unit during lightning, please stop operating the unit and remove the plug from the socket.
Interference From Electrical Products
!
Caution
To avoid noise interference, please place the indoor unit and its remote controller at least 1m away from electrical products.
To prevent interference, place at least 1m away.
Inverter-type fluorescent lamp.
TV
– 23 –
ATTACHING THE AIR CLEANSING AND DEODORIZING FILTERS
!
CAUTION
Cleaning and maintenance must be carried out only by qualified service personal. Before cleaning, stop operation and switch off the power supply.
1
2
3
Open the front panel.
Pull up the front panel by holding it at both sides
with both hands.
Remove the filter.
Push upward to release the claws and pull out the
filter.
Attaching the air cleansing and deodorizing filters to the filter.
Attach the air cleansing and deodorizing filters to
the frame by gently compress its both sides and release after insertion into filter frame.
Claws
(4 places)
!
CAUTION
Do not bend the air cleansing and deodorizing filter as it may cause damage to the structure.
4
Attach the filters.
Attach the filters by ensuring that the surface written
FRONT is facing front.
After attaching the filters, push the front panel at
three arrow portion as shown in figure and close it.
NOTE
In case of removing the air cleansing and deodorizing filters, please follow the above procedures.
The cooling capacity is slightly weakened and the cooling speed becomes slower when the air cleansing
and deodorizing filters are used. So, set the fan speed to "HIGH" when using it in this condition.
Air cleansing and deodorizing filters are washable and reusable up to 20 times by using vacuum cleaner
or water rinse under running tap water. Type number for this air cleansing filter is <SPX-CFH7>. Please use this number for ordering when you want to renew it.
Do not operate the air conditioner without filter. Dust may enter the air conditioner and fault may occur.
24
MAINTENANCE
!
CAUTION
Cleaning and maintenance must be carried out only by qualified service personal. Before cleaning, stop operation and switch off 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.
PROCEDURE
1
2
3
Open the front panel and remove the filter
Gently lift and remove the air cleansing and
deodorizing filter from the air filter frame.
Vacuum dust from the air filter and air cleansing and deodorizing filter using vacuum cleaner. If there is too much dust, rinse under running tap water and gently brush it with soft bristle brush. Allow filters to dry in shade.
Re-insert the air cleansing and deodorizing
filter to the filter frame. Set the filter with FRONT mark facing front, and slot them into the original state.
After attaching the filters, push the front panel
at three arrow portions as shown in figure and close it.
NOTE:
Air cleansing and deodorizing filter should be cleaned every month or sooner if noticeable loading
occurs. When used overtime, it may loose its deodorizing function. For maximum performance, it is recommended to replace it every 3-6 months depending on application requirements.
!
CAUTION
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 use detergent on the air cleansing and deodorizing filter as some detergent may deteriorate
the filter electrostatic performance.
– 25 –
2. Washable Front Panel
Remove the front panel and wash with clean
water. Wash it with a soft sponge. After using neutral detergent, wash thoroughly with clean water.
When front panel is not removed, wipe it with
a soft dry cloth. Wipe the remote controller thoroughly with a soft dry cloth.
Wipe the water thoroughly.
If water remains at indicators or signal receiver of indoor unit, it causes trouble.
Method of removing the front panel. Be sure to hold the front panel with both hands to detach and attach it.
Removing the Front Panel
Arm
When the front panel is fully opened with
both hands, push the right arm to the inside to release it, and while closing the front panel
Move the projections of the left and right
arms into the Flanges in the unit and securely insert them into the holes.
Attaching the Front Panel
slightly, put it out forward.
!
CAUTION
Do not splash or direct water to the body of the unit when cleaning
it as this may cause short circuit.
Never use hot water (above 40°C), benzine, gasoline, acid, thinner or
a brush, because they will damage the plastic surface and the coating.
Projection
Hole
Flange
– 26 –
!
CAUTION
Cleaning and maintenance must be carried out only by qualified service personal. Before cleaning, stop operation and switch off the power supply.
3. MAINTENANCE AT BEGINNING OF LONG OFF PERIOD
Run the unit by setting the operation mode to
(COOL), the temperature to 32°C and the fan speed to HI for about half a day on a fine day, and dry the whole of the unit.
Air
Switch off the power plug.
Blow
REGULAR INSPECTION
PLEASE CHECK THE FOLLOWING POINTS BY QUALIFIED SERVICE PERSONAL EITHER EVERY HALF YEARLY OR YEARLY. CONTACT YOUR SALES AGENT OR SERVICE SHOP.
1
2
3
Confirm
Is the earth line disconnected or broken?
Is the mounting frame seriously affected by rust and is the outdoor unit tilted or unstable?
Is the plug of power line firmly plugged into the socket? (Please ensure no loose contact between them).
– 27 –
AFTER SALE SERVICE AND WARRANTY
WHEN ASKING FOR SERVICE, CHECK THE FOLLOWING POINTS.
CONDITION CHECK THE FOLLOWING POINTS
Is the fuse all right?
When it does not operate
When it does not cool well When it does not hot well
Notes
In quiet operation or stopping the operation, 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
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 the air filter and the evaporator regularly must be cleaned to reduce the odor.
Is the voltage extremely high or low?
Is the circuit breaker ON?
Was the air filter cleaned?
Does sunlight fall directly on the outdoor unit?
Is the air flow of the outdoor unit obstructed?
Are the doors or windows opened, or is there any source of
heat in the room?
Is the set temperature suitable?
gradually warmed as operation stops.
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.
Power supply shall be connected at the rated voltage, otherwise the unit will be broken or could not reach the specified capacity.
Please note: On switching on the equipment, particularly when the room light is dimmed, a slight brightness fluctuation may occur. This is of no consequence. The conditions of the local Power Supply Companies are to be observed.
Note
Avoid to use the room air conditioner for cooling operation when the outside temperature is below
21°C (70°F). The recommended maximum and minimum operating temperatures of the hot and cold sides should be as below:
Cooling Heating
Minimum Maximum Minimum Maximum
Indoor
Outdoor
Dry bulb °C21322027
Wet bulb °C15231219
Dry bulb °C21 43 2 21
Wet bulb °C15 26 1 15
– 28 –
CONSTRUCTION AND DIMENSIONAL DIAGRAM
MODEL RAK-25NH4, RAK-35NH4, RAK-50NH4
Air suction grill
183
Mounting plate
860
Top air suction grill
Front panel
Cabinet
285
About
380
350
About
View from back
(Pipe lead-out)
6.5 60
47
47
31 120.5
60 60
240 170450
Drain outlet
Horizontal deflectorDischarge grill
Drain hose
Hole on the wall for ø 65mm pipe
47
Drain
Narrow pipe
Vertical deflector
P
7070140
Drain cap connection port
147
56 17.5
28
47
When piping is drawn horizontally, exchange the drain hose for the drain cap
6.5 60
Connecting cable
– 29 –
Wide pipe
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