Hitachi RAC-18WPC User manual

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
ROOM AIR CONDITIONER
OUTDOOR UNIT
SERVICE MANUAL
REFER TO THE FOUNDATION MANUAL
TECHNICAL INFORMATION
FOR SERVICE PERSONNEL ONLY
SPECIFICATIONS
CONTENTS
SPECIFICATIONS ------------------------------------------------------------------- 6
CONSTRUCTION AND DIMENSIONAL DIAGRAM --------------------- 8
MAIN PARTS COMPONENT --------------------------------------------------- 9
WIRING DIAGRAM ---------------------------------------------------------------- 11
After installation
BLOCK DIAGRAM ----------------------------------------------------------------- 13
REFRIGERATING CYCLE DIAGRAM --------------------------------------- 14
DESCRIPTION OF MAIN CIRCUIT OPERATION ----------------------- 16
SERVICE CALL Q & A ---------------------------------------------------------- 24
TROUBLE SHOOTING ----------------------------------------------------------- 28
PARTS LIST AND DIAGRAM --------------------------------------------------
HHAW
RAC-18WPC
RAC-25WPC
OUTDOOR UNIT
OUTDOOR UNIT OUTDOOR UNIT
RAC-18W RAC-25W
(KW)
(B.T.U./h)
(KW)
(B.T.U./h)
W660(+60) 660(+60)
H530 530
D278(+35) 278(+35)
MODEL
POWER SOURCE
TOTAL INPUT (W
TOTAL AMPERES (A)
CAPACITY
COOLING
HEATING
TOTAL INPUT (W
TOTAL AMPERES (A)
CAPACITY
DIMENSIONS
(mm)
3.12-2.97
2.00 (0.90 2.50)
8,530 (3,070 10,580)
580 (250 970)
2.50 (0.90
27.5 27.5
3.20)
3.49-3.34
11,600 (3,070 15,010)
880 (250 1,250)
NET WEIGHT (Kg)
TYPE DC INVERTER
1 PHASE,50Hz,220-230V 1 PHASE,50Hz,220-230V
550 ( 700 (250
)1,290)
4.56-4.36
3.40 (0.90 4.40)
11,600 (3,070 15,010)
3.75-3.59
2.50 (0.90 3.10)
8,530 (3,070 10,580)
250
PC PC
RAC-18WPC
RAC-25WPC
PROCEDURE FOR DISASSEMBLY AND REASSEMBLY-------------15
0100E
41
1010
Johnson Controls - Hitachi Air Conditioning Wuhu Co., Ltd.

 



 
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
 

 

 
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 

 

 

 
 

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
 

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





 








DANGER
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 manufactures during maintenance and handling thereof. (They apply the same to handling of
abnormal goods such as rejected goods being returned.)
2. Object parts
(1) Microcomputer
(2) Integrated circuits (I.C.)
(3) Field effective transistor (F.E.T.)
(4) P.C. boards or the like to 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.
HITACH I IC401TH 1 ,188UV
Fig. 1 Conductive container
A conductive polyvinyl bag
IC
IC
Conductive sponge
Fig. 2 Body earth
Body earth (Elimik conductive band)
Clip for connection with
a grounding wire
1MΩ
3

(6) Use a three wire type soldering iron including a grounding wire.
Fig.4 Grounding a solder 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 short circuit a load circuit or the like.
Bare copper wire (for body earth)
Metal plate (of Al. stainless steel, etc.)
Working table
Resistor 1MΩ(1/2W)
Earth wire
Staple
Fig.3 Grounding of the working table
soldering iron
Grounding wire
Screw stop at the screwed
part using a rag plate
4

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 turn off the circuit breaker for safety.
3. In the event of power failure,the room air conditioner will restare automatically in the previously
mode once the power is restored. In the event of power failure during TIMER operation, the room air comditioner
will not start automatically. Re-press ON/OFF button after 3 minutes from when the unit off or power recovery.
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 and heating 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 -10°C (14°F).
6. This room air conditioner (the reverse cycle) should not be used when the outside temperature is below
–15°C (5°F).
If the reverse cycle is used under this condition, the outside heat exchanger is frosted and efficiency falls.
7. When the outside heat exchanger is frosted, the frost is melted by operating the hot gas system, it is not
trouble that at this time fan stops and the vapour may rise from the outside heat exchanger.
!
CAUTION
selected
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
NOISE SUPPRESSOR
THERMOSTAT
REMOTE CONTROL SWITCH (LIQUID
CRYSTAL)
NO
NO
NO
YES(INTERNAL)
YES
G4A-1A
NO
NO
YES
YES
YES(IC)
NO
WITHOUT REFRIGERANT BECAUSE
COUPLING IS FLARE TYPE.
UNIT
PIPES
(MAX. 20m)
REFRIGERANT CHARGING
VOLUME
(Refrigerant 410A)
RAC-18WPC
ASD084SFNA7JK1
RAC-25WPC
(MIN. 3m)
47W (DC120~380V)
950g
15A, 2A, 3A, 3.15A
YES
450NR, ERZVA431
R
6

Figure showing the installation of lndoor and Outdoor unit
MODEL RAC-18WPC
RAC-25WPC
The refrigerating machine oil is
easily affected by moisture. Use
caution to prevent water from
entering the cycle.
The difference in height between
the indoor and outdoor unit
should be kept below 10m.
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 16mm
Please use insulated drain hose for
the indoor piping (commercial
product)
The clearances of the
unit from top, left, right
and front are specified
in figure below. At least
three of the above sides
must be open air.
Maximum pipe length 20m Minimum pipe length 3m
give clear
as wide a
possible
200mm
above 200mm
above 100mm
300mm
above
above 50mm
above
7

CONSTRUCTION AND DIMENSIONAL DIAGRAM
OUTDOOR UNIT
NOTE:
1.For outdoor unit installation , allow at least 2 sides of space around the unit ensure ventilation flue.
2.The connecting pipe , should all the insulated with insulation pipe.
3.Piping length is within 20m.
4.Height d fferent of the piping between the indoor unit and outdoor unit s ould be within 10m.hi
MODEL RAC-18WPC,RAC-25WPC
More
than
200
Air outlet
530
720
660
500 81
2783560660
More than
More than
Drain hole
300
34 50
20
317
8

MAIN PARTS COMPONENT
FAN MOTOR
MAIN ELECTRIC COMPONENTS FOR OUTDOOR UNIT
Fan Motor Specifications
SLEDOMELBACILPPAGNITAREMAN
BLU : BLUE YEL : YELLOW BRN : BROWN WHT : WHITE
GRY : GRAY ORN : ORANGE GRN : GREEN RED : RED
BLK : BLACK PNK : PINK VIO : VIOLET
RAC-18/25WPC
THERMOSTAT (Room temperature Thermistor)
CONNECTION
MODEL
ECRUOSREWOP
TUPTUO
V083-021:CD
W74
WHT(V)
BLK(W)
M
M
M
RED(U)
RAC-18/25WP
REACTOR 15 (mH) 250 m MAX (20 ˚C) C
9

WHITE
COMPRESSOR
YELLOW
MODEL
COMPRESSOR TYPE
POWER SOURCE
COMPRESSOR MOTOR
Compressor Motor Specifications
!
CAUTION
When the refrigerating cycle has been operated for a long time with the capillary tubes clogged or crushed
or with too little refrigerant, check the color of the refrigerating machine oil inside the compressor. If the
color has been changed conspicuously, replace the compressor.
(U)
(V)
(W)
M
M
WHITE
YELLOW RED
RAC-
ASD084SFNA7JK1
18/25WPC
(U)
(V)
75
2M= 0.74
2M= 0.88
100 - 240 V
M
RAC-18/25WPC
RED
(W)
10

WIRING DIAGRAM
RAC-18/25WPC
11

MODEL RA C-18/25WPC
12

1
2
3
EEPROM
Relay drive circuit
Reversing valve
drive circuit
Electric expansion
valve drive circuit Electric expansion
valve
Reversing valve
Outdoor
Fan motor
Is
Ip
Id
Ip
Id
(AX-12C872)
Outdoor DC fan motor
drive circuit
Compressor
motor
Compressor
drive circuit
BLOCK DIAGRAM
OUTDOOR UNITPower source
1 O 230V 50Hz
Outdoor microcomputer
Indoor / Outdoor
interface circuit
Power circuit
Control power circuit
Reset circuit
Overheat thermistor
Defrost thermistor
Outdoor temperature
thermistor
Oscillator clock
circuit
L
N
MODEL RAC-18/25WPC
Indoor
unit
13

MODEL RAC-18/25WPC
Indoor unit
Indoor unit
14

Fi
g. 2
Fi
g. 3
Fig.4
(5) Remove the electrical box fixing screws and
G
ND wire fixing
scre
w
.
(
Remove P
lock
w
hich
bi
n
ds
lead
w
i
r
es
.
(
S
et the electrical box u
p
side down.
(
Remove
P
.
W
.B.
f
ixing screws (2 locations) and radiation
f
in
f
ixing
screws
(
locations
)
, and remove the
P
.W
.
B
.
f
rom t
h
e su
pp
ort.
1. Electr
i
cal Part
s
(
1
)
R
emove t
h
e upper cover
fi
x
i
ng screws an
d
lif
t t
h
e cover to remove
i
t.
(
2
)
Remove the service valve cover
.
(
3
)
Remove the terminal
p
late cover
.
(4) Remove the right side cover
.
Radiation fin fixing screw
P.W.B. fixing screw
Fi
g. 1
MODEL RAC-18/25WP<OUTDOOR UNIT>
7
6)
7)
8)
C
4
right side cover.
terminal cover.
valve cover.
Procedure for Disassembly and Reassembly
15

LN
300-330
Main parts
LN
C021-C022,375 ,420V)
R
15
AC-18/25WPC
DESCRIPTION OF MAIN CIRCUIT OPERATION
16

2. Power circuit (Low voltage)
Fig. 2-1
The 230V AC voltage is rectified to DC voltage (B-12V,16V,12V,5V) pass through switching control IC (ICI), switching
transformer.
(1) B-12V Power supply for electrical expansion valve.
(2) 16V Power supply for IPM driver circuit of compressor and fan motor, IGBT action.
(3) 12V Power supply for 4 way valve relay, power relay, inrush current relay,motor current amplification,
(4) 5V Power supply for microcomputer, peripheral circuits.
17

C
IC4
DC/DC convertor IC (DC12V DC5V).
001,C002,C003,C004,C005,C011,C013,C014，NF1
1,2,5,8.
L105 (JUMPER)
D110 (EARTH)
L104 (JUMPER)
D110 (EARTH)
L103 (JUMPER)
D110 (EARTH)
R120 B-12V
R120 B-0V)
B-12V O/P Expansion valve
Main parts
1
2
2
3
0.5V
1.5V
1.0V
15.5
2.5V
1.0V
13
18

6
Reversing valve
12V
HIC P.W.B
28
Control P.W.B
AC230V
SK1
Point
operation mode
Cooling
Heating
Usual cooling Hi
Lo
Hi
0V
12V
0V
AC230V
CN2 1 - CN2 4
0V
AC230V
Usual heating
Defrost
HIC 34 pin - 0V
This model reversing valve control used to control the relay ON/OFF of the revesing valve, and also control the coil of the
reversing valve ON/OFF.
The relay ON/OFF has different type when in the different operation mode.
You can see each operation mode as fllows. If the reaversing valve not connected or all the condition not the same as follow,
it may be something wrong with the reversing valve circuit.
micon
4
1
RL3
RL3( coil)
1134
4.Reversing valve control circuit
28
Fig.4-1
19

5
5-1
10
11
12
74
74
70
70 74 75
5-1
HIC P.W.B
74
70
75
20