RAS07CH4
RAS09CH4
RAC07CH4
RAC09CH4
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
SM0205
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
RAS07CH4
RAC07CH4
RAS09CH4
RAC09CH4
POWER SOURCE
1Ø, 220V, 50Hz
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
RAS07CH4 / RAC07CH4
RAS09CH4 / RAC09CH4
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 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 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 M
(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
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.