Hitachi RAS-10G5 User manual

NO. 0487E
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
ROOM AIR CONDITIONER
INDOOR UNIT + OUTDOOR UNIT
MARCH 2011 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
H
D
(kg)
(WALL TYPE)
TYPE
MODEL
POWER SOURCE
TOTAL INPUT
TOTAL AMPERES
CAPACITY
DIMENSIONS
(mm)
NET WEIGHT
SPECIFICATIONS
CONTENTS
SPECIFICATIONS------------------------------------------------------ 5
HOW TO USE ---------------------------------------------------------- 8
CONSTRUCTION AND DIMENSIONAL DIAGRAM---------29
MAIN PARTS COMPONENT --------------------------------------31
WIRING DIAGRAM---------------------------------------------------34
CIRCUIT DIAGRAM--------------------------------------------------37
PRINTED WIRING BOARD LOCATION DIAGRAM --------39
BLOCK DIAGRAM----------------------------------------------------41
BASIC MODE ----------------------------------------------------------43
REFRIGERATING CYCLE DIAGRAM---------------------------46
DESCRIPTION OF MAIN CIRCUIT OPERATION-----------47
AUTO SWING FUNCTION-----------------------------------------55
SERVICE CALL Q & A----------------------------------------------56
PARTS LIST AND DIAGRAM--------------------------------------60
RAS-10G5 / RAC-10G5
RAS-14G5 / RAC-14G5
COOLING
INDOOR UNIT
RAS-10G5
780
280
220
9
RAS-10G5
RAS-14G5
OUTDOOR UNIT
RAC-10G5
INDOOR UNIT
RAS-14G5
OUTDOOR UNIT
RAC-14G5
700
468
258
25
700
468
258
25
780
280
220
9
1 PHASE, 50 Hz, 220-230V
870-900
4.00-3.95
2.90-2.90
9890-9890
1 PHASE, 50 Hz, 220-230V
1210-1230
5.70-5.50
3.02-3.01
12,460-12,630
RAC-10G5
RAC-14G5

! 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. Modi cation 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,  oor 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 in ammable 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.

! 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 1M 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 1M (1/2W)
Earth wire
Fig. 3. Grounding of the working table
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 !
!CAUTION
1. In quiet or stop operation, slight  owing 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 recommended to stop the operation and to disconnect the power cord plug
from the power outlet for safety.
3. In the event of power failure, the airconditioner will restart automatically in the previously selected mode
once the power is restored. In the event of power failure during TIMER operation, the timer will be reset
and the unit will begin or stop operating under a new timer setting.
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 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 21°C (70°F).
6. When the operation button is set to ^cool_ from other mode, the compressor will stop for about 3 minutes
as IC delay circuit protection.

! 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
FUSE CAPACITY (TIME DELAY FUSE)
THERMOSTAT
REMOTE CONTROL SWITCH (LIQUID CRYSTAL)
RAS-10G5
RAS-14G5
20 W
NO
NO
!
NO
NO
NO
3.15A
G4A
YES
YES
YES
YES (SWITCHING
POWER SUPPLY)
450NR
---------
YES(IC)
YES
---------
---------
30 W
2.5µF, 450VAC
YES
35µF, 450 VAC 45µF, 450 VAC
YES (EXTERNAL)
YES (EXTERNAL)
NO
NO
NO
NO
NO
NO
NO
10 A 15 A
NO
NO
680gUNIT
MAX. PIPES
REFRIGERANT CHARGING
VOLUME
(Refrigerant R410A)
RAC-10G5 RAC-14G5
ASG108CV UG4B124JX
630g
15m

! 6 !
MODEL RAS-10G5 / RAC-10G5
Figure showing the installation of Indoor and Outdoor unit
In case the pipe length is more than 8m, add refrigerant R410A at 15 gram per every meter exceeds. However, pipe
length shall not exceed 15m.
CAUTION
!
● The difference in height
between the indoor and
outdoor unit should be kept
max 5m.
● The connecting pipe, no
matter big or small, should
all be insulated with insulation
pipe and then wrapped with
vinyl tape. (The insulator will
deteriorate if it is not wrapped
with tape).
The connection of insulated
drain hose.
Please use insulated drain
hose for the indoor piping
(commercial product).
The indoor piping should be
insulated with the enclosed
insulation pipe. (If the insulator
is insufficient, please use
commercial products).
Be sure to
completely
seal any gap.

! 7 !
MODEL RAS-14G5 / RAC-14G5
Figure showing the installation of Indoor and Outdoor unit
In case the pipe length is more than 8m, add refrigerant R410A at 10 gram per every meter exceeds. However, pipe
length shall not exceed 15m.
CAUTION
!
● The difference in height
between the indoor and
outdoor unit should be kept
max 5m.
● The connecting pipe, no
matter big or small, should
all be insulated with insulation
pipe and then wrapped with
vinyl tape. (The insulator will
deteriorate if it is not wrapped
with tape).
The connection of insulated
drain hose.
Please use insulated drain
hose for the indoor piping
(commercial product).
The indoor piping should be
insulated with the enclosed
insulation pipe. (If the insulator
is insufficient, please use
commercial products).
Be sure to
completely
seal any gap.

– 8 –
INDOOR UNIT
NAMES AND FUNCTIONS OF EACH PART
PRE-FILTER
To prevent dust from coming into the indoor unit.
(Refer Instruction manual)
FRONT PANEL
INDOOR UNIT INDICATORS
Light indicator showing the operating condition.
(Refer page 9)
HORIZONTAL DEFLECTOR ●VERTICAL
DEFLECTOR (AIR OUTLET)
REMOTE CONTROLLER
Send out operation signal to the indoor unit. So as to
operate the whole unit.
(Refer Instruction manual)
OUTDOOR UNIT
WIDTH (mm)MODEL
RAS-10G5 / RAS-14G5
RAC-10G5 / RAC-14G5
HEIGHT (mm) DEPTH (mm)
MODEL NAME AND DIMENSIONS
780
700
280
468
220
258
DRAIN PIPE
Condensed water drain to outside.
CONNECTING CORD
AIR INLET (BACK, LEFT SIDE)
AIR OUTLET

– 9 –
INDOOR UNIT INDICATORS
OPERATION INDICATOR
FILTER LAMP
When the device is operated for a total of about 200
hours, the FILTER lamp lights to indicate that it is
time to clean the filter. The lamp goes out when the
“ (AUTO SWING)” button is pressed while the
device is on “STANDBY MODE”.
OPERATION LAMP
This lamp lights during operation.
TIMER LAMP
This lamp lights when the timer is working.
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.

– 10 –
MEMO
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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.
Minimum Maximum
Indoor Dry bulb °C 21 32
Wet bulb °C 15 23
Outdoor Dry bulb °C 21 43
Wet bulb °C 15 26
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:

– 11 –
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.
Make sure to connect earth line.
Indicates the instructions that must be followed.
The sign in the figure indicates prohibition.
PRECAUTIONS DURING SHIFTING OR MAINTENANCE
●
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.
●
If the supply cord is damaged, it must be replaced by the special cord obtainable at authorized
service/parts centers.
W
A
R
N
I
N
G
!
PRECAUTIONS DURING OPERATION
●
Avoid an extended period of direct air flow for your health.
W
A
R
N
I
N
G
!
●
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.
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.
●
Be sure to use the specified piping set for R410A. Otherwise, this may result
in broken copper pipes or faults.
●
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
!
!

– 12 –
PRECAUTIONS DURING OPERATION
●Do not attempt to operate the unit with wet hands, this could cause fatal
accident.
●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 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 person 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.

– 13 –
NAMES AND FUNCTIONS OF REMOTE CONTROL UNIT
REMOTE CONTROLLER
This controls the operation of the indoor unit. Signal range to reach indoor unit is about 7 meters. If
inverter lamp is used, 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.
●Transmission sign
The transmission sign blinks when a signal is sent.
●Display
This indicates the room temperature selected, timer status, function
and intensity of circulation selected.
●CIRCULATION button
Use this button to set air circulation in the room or start operation.
●DEHUMIDIFYING button
Use this button to dehumidify the room or start operation.
●COOLING button
Use this button to set cooling mode in the room or start operation.
●RESET button
●SUPER COOLING button
Use this button to deliver faster and more comfortable air-conditioning.
●STOP button
Press this button to stop operation only.
●SLEEP button
Use this button to set the sleep timer.
●FAN SPEED selector
This determines the fan speed. Each time you press this button,
the intensity of circulation will change from (AUTO) to (HI)
to (MED) to (LOW).
●AUTO SWING button
Controls the angle of the horizontal air deflector.
●TEMPERATURE button
Use this button to raise or lower the temperature setting. (Keep
pressed, and the value will change more quickly.)
●OFF-TIMER button Select the turn OFF time.
●ON-TIMER button Select the turn ON time.
Precautions for Use
●Do not put the remote controller in the following places.
●In direct sunlight.
●In the vicinity of a heater.
●Handle the remote controller carefully. Do not drop it on the
floor, and protect it from water.
●Once the outdoor unit stops, it will not restart for about 3
minutes (unless you turn the power switch off and on or unplug
the power cord and plug it in again).
This is to protect the device and does not indicate a failure.

– 14 –
Ý
C
COOLING OPERATION
Use the device for cooling when the outdoor temperature is 21 ~ 43°C.
If indoors humidity is very high (over 80%), some dew may form on the air outlet grille of the indoor unit.
Press the button so that the display indicates (COOL).
Cooling operation starts with a beep.
The cooling function does not start if the temperature setting
is higher than the current room temperature (even though
the (OPERATION) lamp lights). The cooling function will
start as soon as you set the temperature below the current
room temperature.
Set the desired FAN SPEED with the (FAN SPEED) button
(the display indicates the setting).
(AUTO): The FAN SPEED is HI at first and varies to
MED or LOW automatically when the preset
temperature has been reached.
(HI) : Hi fan speed mode.
(MED) : Medium fan speed mode.
(LOW) : Low fan speed mode.
Set the desired room temperature with the TEMPERATURE
button (the display indicates the setting).
The range of 25 ~ 28°C is recommended as
the room temperature for cooling.
If the temperature setting is 27°C, the room
temperature will be controlled at around 27°C.
The temperature setting and the actual room temperature may
vary somewhat depending on conditions.
Press the (STOP) button to stop operation.
■As the settings are stored in memory in the remote controller, you
only have to press the (COOLING) button to repeat the same
settings next time.
1
2
STOP
3

– 15 –
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.
■Dehumidifying Function
When the room temperature is higher than the temperature setting: The device will dehumidify the room
and 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. You might feel a bit colder in dehumidifying operation.
■As the settings are stored in memory in the remote controller, you only
have to press the (DEHUMIDIFY) button next time.
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.
2
Press the (DEHUMIDIFY) button. Dehumidifying operation
starts with a beep.
The FAN SPEED is set at LOW automatically.
The FAN SPEED button does not work.
1
Press the (STOP) button to stop operation.
STOP
Ý
C

– 16 –
CIRCULATION OPERATION
Press the button so that the display indicates
(CIRCULATE).
Circulating operation starts with a beep.
Press the FAN SPEED button and select the desired FAN
SPEED (the display indicates your choice).
Press the temperature control button to set to the desired
temperature.
■As the settings are stored in memory in the remote controller,
you only have to press the (CIRCULATION) button next time.
3
Press the (STOP) button to stop operation.
STOP
1
2
■Circulation Function
●During circulation operation, compressor does not run and there is no cooling operation with only indoor
fan running.
●When the setting temperature is higher than room temperature, indoor fan will stop running.

– 17 –
SUPER COOLING
Press the button.
●Operation start with a signal received sound “beep”.
●Unit will be forced operate in (COOL) with SUPER HI fan
speed for 20 minutes. Indicator appear during this period
while temperature and fan speed setting display remain
unchanged. (Operation lamp at indoor unit is blinking).
●After 20 minutes, operation lamp stop blinking and indicator
will disappear while unit will be in (COOL) mode. Temperature
and fan speed will change to previous setting.
●Air blow sound will be slightly high due to forced operation.
1
NOTE
(1) OFF TIME setting : OFF timer will be a priority over the
SUPER COOLING operation time.
(2) ON TIME setting : SUPER COOLING operation will be
a priority over the ON timer operation
time.
CANCELLATION of SUPER COOLING Operation
Cancel Condition Operation mode after cancel
Press or OFF timer time is up Stop operation
key press DEHUMIDIFYING operation
Press or
Press or
Press or
Press or
20 minutes time is up
Normal COOLING operation
key press CIRCULATION operation

– 18 –
HOW TO SET THE SLEEP TIMER
Press the (SLEEP) button, and the display changes as shown below.
Mode
Sleep timer
Indication
1 hour 2 hours 3 hours 7 hours
Sleep timer off
44 44
1
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.
Cooling
“ ”
and
dehumidifying
“ ”
Explanation of the sleep timer
The device will control the FAN SPEED and room temperature automatically
so as to be quiet and good for people’s 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.
Function Operation
The room temperature will
be controlled 2°C above the
setting temperature and the
FAN SPEED will be set to LOW
setting 1 hour after the setting
of the sleep timer.
SLEEP

– 19 –
■ON Timer and OFF Timer are available.
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.
OFF Timer Reservation ■Operation stop at setting time
ON TIME setting
●Select the ON TIMER by pressing the (ON)
Button.
●Setting time will change according to the below
sequence.
ON Timer Reservation ■Operation will start for setting
temperature at setting time (The starting
time may different depend on the room
temperature and set temperature).