Hitachi RAS-07CH4 User manual

RAS-07CH4
RAS-09CH4
RAC-07CH4
RAC-09CH4
SERVICE MANUAL
TECHNICAL INFORMATION
REFER TO THE FOUNDATION MANUAL
FOR SERVICE PERSONNEL ONLY
CONTENTS
SPECIFICATIONS ............................................................... 5
HOW TO USE ..................................................................... 6
CONSTRUCTION AND DIMENSIONAL DIAGRAM ........ 32
MAIN PARTS COMPONENTS ......................................... 33
WIRING DIAGRAM ........................................................... 35
BASIC MODE .................................................................... 41
REFRIGERATING CYCLE ................................................ 46
AUTO SWING FUNCTION ............................................... 47
SERVICE CALL Q & A ..................................................... 48
PARTS LIST AND DIAGRAM ........................................... 53
PM NO. 0205E
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
ROOM AIR CONDITIONER
INDOOR UNIT + OUTDOOR UNIT
MARCH 2004 H.A.P.M.
SPECIFICATIONS
TYPE WALL TYPE
INDOOR UNIT OUTDOOR UNIT INDOOR UNIT OUTDOOR UNIT
MODEL RAS-07CH4 RAC-07CH4 RAS-09CH4 RAC-09CH4
POWER SOURCE 1Ø, 220 V, 50 Hz
TOTAL INPUT (W) 680 870
COOLING TOTAL AMPERES (A) 3.15 4.1
CAPACITY (kW) 2.05 2.50
(B.T.U./h) 7,000 8,500
TOTAL INPUT (W) 630 860
HEATING TOTAL AMPERES (A) 3.0 4.1
CAPACITY (kW) 2.15 2.65
(B.T.U./h) 7,850 10,000
W 785 700 785 700
DIMENSIONS (mm) H 265 570 265 570
D 168 210 168 210
NET WEIGHT (kg) 7 26 7 26
RAS-07CH4/RAC-07CH4
RAS-09CH4/RAC-09CH4

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.
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 the 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 occurrence 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 1MΩor 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 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 after reinforced or at a
new location.
10. Any inflammable object must not 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.
If the contacts of electrical parts
are defective, replace the
electrical parts without trying to
repair them.
Spray
gasoline
gasbombe thinner
DANGER
First, I must disconnect
the power cord plug
from the power outlet.

– 1 –
HITACHI IC401TH1 ,188UV
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).
(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
IC
A conductive polyvinyl bag
Conductive sponge
Fig. 1 Conductive Container
Fig. 2 Body Earth
Body earth
(Elimik conductive band)
Clip for connection with
a grounding wire

–2 –
(6) Use a three wire type soldering iron including a grounding wire.
Bare copper wire (for body earth)
Working table
Resistor of 1 MΩ(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, 10MΩor 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 –
CAUTION
1. In quiet or stop operation, 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.

–4 –
There are 3 directions allowed,
namely, horizontally perpen-
dicular to the unit, vertically
down from right, horizontally
out from right.
Don’t form the piping
downward at the left of the unit.
Horizontally
perpendicular
to the unit
Connection
20
Dimension of Mounting Stand
of the outdoor unit
(unit : mm)
35
12
225
8
35
500
100
above 100mm
above 50mm
above 100mm
2,300mm or more
above 300mm
must not bend about 0.45m
Maximum pipe length 10m Minimum pipe length 5m
*above 50mm
*give clearance
as wide as possible
above 200mm
*above 200mm
above 100mm
above 50mm when
installed on the
ceiling of balcony
above 200mm
The indoor piping should be
insulated with the enclosed
insulation pipe. (If the
insulator is insufficient, please
use commercial products).
The difference in height
between the indoor and
outdoor unit should be kept
below 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.
inner diameter ø16mm
Please use insulated drain
hose for the indoor piping
(commercial product.)
•
•
mounting stand
Plug
Be sure to
completely
seal any gap
with putty.
The Length of Indoor Unit
Connecting Cord
about
0.9m about 1.6m
Do not alter the power cord.
Cut away shaded
portion, and finish
the edge of the
opening so that
there is no burr.
Figure showing the Installation
of Indoor and Outdoor unit.

–5 –
SPECIFICATIONS
MODEL RAS-07CH4 RAC-07CH4 RAS-09CH4 RAC-09CH4
FAN MOTOR 10 W 20 W 10 W 20 W
FAN MOTOR CAPACITOR 1 µF, 400 V 1.5 µF, 400 V 1 µF, 400 V 1.5 µF, 400 V
FAN MOTOR PROTECTOR
YES (INTERNAL) YES (INTERNAL) YES (INTERNAL) YES (INTERNAL)
COMPRESSOR NO G333DB2Z NO G533QB9Z
COMPRESSOR MOTOR CAPACITOR NO 30 µF, 400 V NO 30 µF, 400 V
OVERLOAD PROTECTOR NO YES NO YES
OVERHEAT PROTECTOR NO NO NO NO
FUSE (for MICRO COMPUTER) 3.0 A NO
POWER RELAY G4A NO G4A NO
POWER SWITCH YES NO YES NO
TEMPORARY SWITCH YES NO YES NO
SERVICE SWITCH YES NO YES NO
TRANSFORMER YES NO YES NO
VARISTOR 450NR NO 450NR NO
NOISE SUPPRESSOR NO NO NO NO
REMOTE CONTROL SWITCH (LIQUID CRYSTAL) YES NO YES NO
THERMOSTAT YES (IC) NO YES (IC) NO
FUSE CAPACITY 10 A TIME DELAY FUSE
UNIT -------- ❇ 630 g -------- ❇ 700 g
REFRIGERANT CHARGING
VOLUME WITHOUT REFRIGERANT BECAUSE COUPLING IS FLARE
(Refrigerant 22) PIPES TYPE.
P - 105 VK1 (5m), P - 108 VK1 (8m)
❇630g for piping set of 5 ~ 8m.
❇700g for piping set of 5 ~ 8m.

–6 –
SAFETY PRECAUTION
●
Please read the “Safety Precaution”carefully before operating the unit to ensure correct usage of the unit.
●
Pay special attention to signs of “Warning”and “Caution”. The “Warning”section contains matters which,
if not observed strictly, may cause death or serious injury. The “Caution”section contains matters which may
result in serious consequences if not observed properly. Please observe all instructions strictly to ensure safety.
●
The sign indicate the following meanings.
●
Please keep this manual after reading.
WARNING
PRECAUTIONS DURING INSTALLATION
●
●
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●Please ensure smooth flow of water when installing the drain hose.
CAUTION
PRECAUTIONS DURING SHIFTING OR MAINTENANCE
PRECAUTIONS DURING OPERATION
●Avoid an extended period of direct air flow for your health.
W
A
R
N
I
N
G
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●During thunder storm, disconnect and turn off the circuit breaker.
●Do not use any conductor as fuse wire, this could cause fatal accident.
Make sure to connect earth line.
Indicates the instructions that must be followed.
The sign in the figure indicates prohibition.
W
A
R
N
I
N
G
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.
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 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.
Should abnormal situation arises (like burning smell), please stop operating the unit
and turn off the circuit breaker. Contact your agent. Fault, short circuit or fire may
occur if you continue to operate the unit under abnormal situation.
Please contact your agent for maintenance. Improper self maintenance may cause
electric shock and fire.
Please contact your agent if you need to remove and reinstall the unit. Electric
shock or fire may occur if you remove and reinstall the unit yourself improperly.
Do not insert a finger, a rod or other objects into the air outlet or inlet. As the
fan is rotating at a high speed, it will cause injury. Before cleaning, be sure
to stop the operation and turn the breaker OFF.

–7 –
PRECAUTIONS DURING OPERATION
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C
A
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T
I
O
N
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The product shall be operated under the manufacturer specification and
not for any other intended use.
When operating the unit with burning equipments, regularly ventilate the
room to avoid oxygen insufficiency.
Please ensure that outdoor mounting frame is always stable, firm and
without defect. If not, the outdoor unit may collapse and cause danger.
Turn off the circuit breaker if the unit is not to be operated for a long period.
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.
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.
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.
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 attempt to operate the unit with wet hands, this could cause fatal
accident.
Do not splash or direct water to the body of the unit when cleaning it as this
may cause short circuit.
Please switch off the unit and turn off the circuit breaker during cleaning, the
high-speed fan inside the unit may cause danger.
Do not climb on the outdoor unit or put objects on it.
Do not place plants directly under the air flow as it is bad for the plants.

–8 –
NAMES AND FUNCTIONS OF EACH PART
INDOOR UNIT
OUTDOOR UNIT
Air Filter
To prevent dust from coming into the indoor unit.
(Refer page 24)
Suction Grille (Air Inlet)
Indoor unit Indicators
Light indicator showing the operation condition.
(Refer page 9)
Horizontal Deflector • Vertical Deflector
(Air outlet)
(Refer page 20)
Remote Control
Send out operation signal to the indoor unit.
So as to operate the whole unit.
(Refer page 10)
Drain pipe
Condensed water drain to outside.
Connecting cord
Air inlet (Back and left side)
Air outlet
Blow out warm air.
MODEL NAME AND DIMENSIONS
MODEL WIDTH (mm) HEIGHT (mm) DEPTH (mm)
RAS-07CH4, RAS-09CH4 785 265 168
RAC-07CH4, RAC-09CH4 700 570 210