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CAUTION:
Before servicing this chassis, it is important that the service technician read the "Safety
Precautions" and "Product Safety Notices" in this service manual.
ATTENTION:
Avant d'effectuer l'entretien du châassis, le technicien doit lire les «Précautions de sécurité»
et les «Notices de sécurité du produit» présentés dans le présent manuel.
VORSICHT:
Vor Öffnen des Gehäuses hat der Service-Ingenieur die ,,Sicherheitshinweise" und ,,Hinweise
zur Produktsicherheit" in diesem Wartungshandbuch zu lesen.
SERVICE MANUAL
MANUEL D'ENTRETIEN
WARTUNGSHANDBUCH
Data
contained
within
this
Service
manual is subject to alteration for
improvement.
Les données fournies dans le présent
manuel d'entretien peuvent faire l'objet
de modifications en vue de perfectionner
le produit.
Die
in
diesem
Wartungshandbuch
enthaltenen Spezifikationen können sich
zwecks Verbesserungen ändern.
«MODEL NAMES»
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
Room Air Conditioner
December 2002
SM0162
RAS18CH1 / RAC18CH1
RAS24CH2 / RAC24CH2
SERVICE MANUAL WITH
INSTALLATION GUIDE


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SM0162
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
ROOM AIR CONDITIONER
INDOOR UNIT + OUTDOOR UNIT
DECEMBER 2002
Refrigeration & Air-Conditioning Division
SERVICE MANUAL
REFER TO THE INSTALLATION
TECHNICAL INFORMATION
FOR SERVICE PERSONNEL ONLY
(W)
(A)
(kW)
(B.T.U./h)
(W)
(A)
(kW)
(B.T.U./h)
W
H
D
(kg)
RAS-18CH1
RAC-18CH1
(WALL TYPE)
TYPE
MODEL
POWER SOURCE
TOTAL INPUT
TOTAL AMPERES
CAPACITY
TOTAL INPUT
TOTAL AMPERES
CAPACITY
DIMENSIONS
(mm)
NET WEIGHT
SPECIFICATIONS
1030
295
183
12
RAS-18CH1
RAS-24CH2
CONTENTS
SPECIFICATIONS --------------------------------------------------- 5
INSTALLATION DIAGRAM ----------------------------------------- 7
CONSTRUCTION AND DIMENSIONAL DIAGRAM ------ 8
MAIN PARTS COMPONENT ------------------------------------ 10
WIRING DIAGRAM -------------------------------------------------- 12
CIRCUIT DIAGRAM ------------------------------------------------- 14
PRINTED WIRING BOARD LOCATION DIAGRAM ----- 15
BLOCK DIAGRAM --------------------------------------------------- 16
BASIC MODE --------------------------------------------------------- 17
REFRIGERATING CYCLE DIAGRAM ------------------------ 20
DESCRIPTION OF MAIN CIRCUIT OPERATION ------- 22
AUTO SWING FUNCTION --------------------------------------- 26
SERVICE CALL Q & A -------------------------------------------- 27
TROUBLE SHOOTING -------------------------------------------- 33
PART LISTS AND ASSEMBLY DIAGRAMS --------------- 36
RAS18CH1 / RAC18CH1
RAS24CH2 / RAC24CH2
RAC-18CH1
RAC-24CH2
COOLING
HEATING
INDOOR UNIT
OUTDOOR UNIT
INDOOR UNIT
OUTDOOR UNIT
RAS-24CH2
RAC-24CH2
1 Ø, 50 Hz, 220 - 230V
1680 - 1730
7.8 - 7.7
5.10
17,410
1680 - 1730
7.8 - 7.7
5.7
19,450
850
650
298
60
1030
295
183
12
850
650
298
60
1 Ø, 50 Hz, 220 - 230V
2180 - 2200
10.4 - 10.1
6.0
20,490
2350 - 2380
11.1 - 10.8
7.0
23,890
After installation
MANUAL AND USERS GUIDE


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­ 1 ­
SAFETY DURING REPAIR WORK
1. 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. Modification of the unit by user should
absolutely be prohibited.
6. Tools and measuring instruments for use in repairs or inspection should be accurately calibrated in advance.
7. After repair, be careful to prevent the occurence of any accident such as electrical shock, leakage of
current, or bodily injury due to the dropping 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-tester.
9. Check the initial location of installation.
If it is found not strong enough or unsafe, the initial location should be reinforced or the unit should be
reinstalled at a new location.
10. Inflammable materials should never
be placed near the location of
installation.
11. Check the grounding to see whether
it is proper or not, and if it is found
improper, connect the ground
terminal to earth.
DANGER
First,
I m
ust
disconnect
the
po
wer
cord
plug
from
the
po
wer
outlet.


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­ 2 ­
WORKING STANDARDS FOR PREVENTING BREAKAGE OF SEMICONDUCTORS
1. Scope
The standards provide for carrying and handling semiconductors during maintenance and handing.
(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) PCBs 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. (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 person handling must always
earth himself. (Earth yourself by passing 1M 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
used.
(4) Be sure to place a part on a metal plate with grounding.
(5) Turn off power when repairing a PCB.
Repair the PCB 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


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­ 3 ­
(6) Use a 3-wire type soldering iron that includs 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
2
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 during maintenance or inspection, make sure the test probes of the
measuring instrument short-circuit a load circuit.
Metal plate (of aluminium, stainless steel, etc.)
Staple