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.