Hitachi RAS-14CH4 User manual

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
ROOM AIR CONDITIONER
INDOOR UNIT + OUTDOOR UNIT
MARCH 2004 H.A.P.M.
REFER TO THE FOUNDATION MANUAL
CONTENTS
SPECIFICATIONS ............................................................... 5
SAFETY PRECAUTION ...................................................... 6
HOW TO USE ..................................................................... 8
CONSTRUCTION AND DIMENSIONAL DIAGRAM ........ 27
MAIN PARTS COMPONENT ............................................ 28
WIRING DIAGRAM ........................................................... 30
BASIC MODE .................................................................... 35
AUTO SWING FUNCTION ............................................... 39
REFRIGERATING CYCLE DIAGRAM .............................. 40
SERVICE CALL Q & A ..................................................... 42
TROUBLESHOOTING ....................................................... 47
PARTS LIST AND DIAGRAM ........................................... 49
RAS-14CH4
RAC-14CH4
RAS-14CH4
RAC-14CH4
TYPE WALL TYPE
INDOOR UNIT OUTDOOR UNIT
MODEL RAS-14CH4 RAC-14CH4
POWER SOURCE 1Ø, 220 V, 50 Hz
TOTAL INPUT (W) 1,290
COOLING TOTAL AMPERES (A) 6.0
CAPACITY (kW) 3.55
(B.T.U./h) 12,120
TOTAL INPUT (W) 1,370
HEATING TOTAL AMPERES (A) 6.30
CAPACITY (kW) 4.10
(B.T.U./h) 14,000
W 815 820
DIMENSIONS (mm) H 298 520
D 179 280
NET WEIGHT (kg) 8 39
SPECIFICATIONS
❈After installation
SERVICE MANUAL
TECHNICAL INFORMATION
FOR SERVICE PERSONNEL ONLY
PM NO. 0204E
RAS-14CH4
RAC-14CH4

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 –
20
270(10-21/32")
145(5-11/16")
12(1-1/2")
50(2")
500(19-11/16")
The Length of Indoor Unit
Connecting Cord
about
0.9m about 1.6m
CAUTION
In case the pipe length is more than 8m, add refrigerant R22 at
25 gram per every meter exceeds. However, pipe length shall not
exceed 10m.
Figure showing the Installation
of Indoor and Outdoor unit.
Cut away shaded
portion, and finish
the edge of the
opening so that
there is no burr.
Direction of Piping
Horizontally
perpendicular
to the unit.
Connection
There are 4 directions allowed, namely,
horizontally perpendicular to the unit,
vertically down from right, horizontally
out from right.
Don't form the piping downward at the
left of the unit.
Dimension of Mounting Stand
of the outdoor unit
(unit: mm)
above 200mm
above 50mm when
installed on the
ceiling of balcony.
above 300mm
❇ above 700mm above 200mm
❇above 100mm
❇give clearance as
wide as possible
Maximum pipe length 10m
Minimum pipe length 5m
Plug
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.)
above 100mm
above 100mm
above 50mm
2,300mm or more
above 300mm
about 0.45m
must not bend
Be sure to
completely
seal any gap
with putty.

–5 –
SPECIFICATIONS
MODEL RAS-14CH4 RAC-14CH4
FAN MOTOR 10 W 20 W
FAN MOTOR CAPACITOR 1 µF, 450 V 2.5 µF, 450 V
FAN MOTOR PROTECTOR YES (INTERNAL) YES (INTERNAL)
COMPRESSOR NO SH933RC2-U
COMPRESSOR MOTOR CAPACITOR NO 35 µF, 440 V
OVERLOAD PROTECTOR NO NO
OVERHEAT PROTECTOR NO YES
FUSE (for MICRO COMPUTER) 3.0 A NO
POWER RELAY G4A-RY-200 NO
POWER SWITCH YES NO
TEMPORARY SWITCH YES NO
SERVICE SWITCH YES NO
TRANSFORMER YES NO
VARISTOR 450NR NO
NOISE SUPPRESSOR NO NO
SOLID STATE RELAY FOR FAN (FAN SSR) S26MD02 NO
EXTERNAL FAN AND REVERSING VALVE RELAY G4U NO
REMOTE CONTROL SWITCH (LIQUID CRYSTAL) YES NO
THERMOSTAT YES (IC) NO
FUSE CAPACITY 15A TIME DELAY FUSE
UNIT ❇ 1,080 g
REFRIGERANT CHARGING WITHOUT REFRIGERANT BECAUSE COUPLING
VOLUME IS FLARE TYPE.
(Refrigerant 22) PIPES P - 103 VK1 (3m), P - 105 VK1 (5m),
P - 108 VK1 (8m)
❇1,080g for piping set of 5 ~ 8m, additional 25g/m R22 is required for additional 8m onward, but cannot exceed
10m.

–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.
Make sure to connect earth line. The sign in the figure indicates prohibition.
Indicates the instructions that must be followed.
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.
● 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
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.
W
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● Avoid an extended period of direct air flow for your health.
● 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.
● Do not use any conductor as fuse wire, this could cause fatal accident.
● During thunder storm, disconnect and turn off the circuit breaker.
PRECAUTIONS DURING OPERATION

–7 –
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 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.
●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.
●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.
●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.
PRECAUTIONS DURING OPERATION

–8 –
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 right side)
Air outlet
MODEL NAME AND DIMENSIONS
MODEL WIDTH (mm) HEIGHT (mm) DEPTH (mm)
RAS-14CH4 815 298 179
RAC-14CH4 820 520 280
NAMES AND FUNCTIONS OF EACH PART
INDOOR UNIT