Hitachi RAC-35WPC 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 ---------------------- 9
MAIN PARTS COMPONENT --------------------------------------------------- 11
WIRING DIAGRAM ---------------------------------------------------------------- 13
After installation
BLOCK DIAGRAM ----------------------------------------------------------------- 16
REFRIGERATING CYCLE DIAGRAM --------------------------------------- 17
DESCRIPTION OF MAIN CIRCUIT OPERATION ----------------------- 20
SERVICE CALL Q & A ---------------------------------------------------------- 37
TROUBLE SHOOTING ------------------------------------------------------------41
HHAW
RAC-35WPC
RAC-50WPC
OUTDOOR UNIT
OUTDOOR UNIT OUTDOOR UNIT
RAC-35W RAC-50W
(KW)
(B.T.U./h)
(KW)
(B.T.U./h)
W750(+65) 792(+85)
H548 600
D288(+27.5) 299(+47)
MODEL
POWER SOURCE
TOTAL INPUT (W
TOTAL AMPERES (A)
CAPACITY
COOLING
HEATING
TOTAL INPUT (W
TOTAL AMPERES (A)
CAPACITY
1,090 (250 1,460)
DIMENSIONS
(mm)
1,560 (500 2,100)
33
NET WEIGHT (Kg)
TYPE DC INVERTER
1 PHASE,50Hz ,220-230V
4.87-4.66
1,100 (250 1,700)
5.51-5.27
14,330 (3,070 17,060)
7.30-6.98
3.50 (0.90 4.00) 5.00 (1.90 5.20)
11,940 (3,070 13,650) 17,060 (6,480 17,740)
20,470 (7,510 24,910)
7.93-7.59
1,660 (500 2,750)
4.20 (0.90 5.00) 6.00 (2.20 7.30)
Hitachi Household Appliances(Wuhu) Co., Ltd.
PC PC
RAC-50WPC
RAC-35WPC
1 PHASE,50Hz ,220-230V
NO.0097E
41
PROCEDURE FOR DISASSEMBLY AND REASSEMBLY-------------19
PARTS LIST AND DIAGRAM --------------------------------------------------56
1

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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-35 PC
1050g 1250g
W
(MIN. 3m)
47W (DC120~380V)
RAC- P50W
15A, 2A, 3A, 3.15A 25A, 2A, 3A, 3.15A
YES
450NR, ERZVA431
R
C
ASD102SKQ A6 JK6 ATD141RDNA8JT
6

Figure showing the installation of Outdoor unit
MODEL RAC-35WPC
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)
above 100mm
above 300mm
above 50mm
give clearance
as wide as
possible
above
200mm
above 50 mm when
installed on the
ceiling of balcony
above 200mm
Maximum pipe length 20m Minimum pipe length m3
7

Figure showing the installation of Outdoor unit
MODEL RAC-50WPC
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)
above 100mm
above 00mm
above 50mm
give clearance
as wide as
possible
above
200mm
above 50 mm when
installed on the
ceiling of balcony
above 200mm
Maximum pipe length 20m Minimum pipe length m3
3
8

CONSTRUCTION AND DIMENSIONAL DIAGRAM
OUTDOOR UNIT
Handle
Air Suction grill
Air outlet
Handle
Rear side
Holes for anchor bolt
(2 – ø12 x 6 slots for ø8.0 bolt)
(for 2 – ø8.0 bolt)
Notch for anchor bolt
Fixing hole
Drain hole
Drain hole
More
than
50
More than
100
More than
200
More
than
300
Service space
More
than
200
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.ih
MODEL RAC-35WPC
9

Unit : mm
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.ih
MODEL RAC-50WPC
More
than
200
More than
More than
300
10
600
345
299
202
163.5
589
92
59
792
877
55
57
190
147
12
(11)
Drain hole
Drain hole
Drain hole

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-30/50WPC
THERMOSTAT (Room temperature Thermistor)
CONNECTION
MODEL
ECRUOSREWOP
TUPTUO
V083-021:CD
W74
WHT(V)
BLK(W)
M
M
M
RED(U)
RAC-35WPC
REACTOR
RAC-50WPC
5.3 (mH), 67m
15 (mH) 250 m MAX (20 ˚C)
11
(20 ˚C)

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-
ASD102SKQ A6 JK6
35WPC RAC-50WPC
75
2M= 2.16 7 2M= 1.310
M
220 - 350 V
ATD141RDNA8JT
_
12
220 - 350 V
20
_
OUTPUT 840W 116 5W
RAC-35WP RAC-50WPC C

WIRING DIAGRAM
RAC-35WPC RAC-5 WP0 C
13

MODEL RAC- WPC3 5
14

MODEL RAC-50WPC
15

BLOCK DIAGRAM
MODEL RAC-35/50WPC
16
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
OUTDOOR UNIT
Power source
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
Indoor
unit

COOLING CYCLE
OUTDOOR UNIT
HEATING CYCLE
OUTDOOR UNIT
MODEL RAC-35WPC
Silencer Silencer
Silencer Silencer
Indoor unit
Indoor unit
17

COOLING CYCLE
OUTDOOR UNIT
HEATING CYCLE
OUTDOOR UNIT
MODEL RAC-50WPC
１／２
１／４
１／２
１／４
Silencer
Silencer
Silencer
Silencer
Silencer
Silencer
Silencer
Silencer
Indoor unit
Indoor unit
18

OUTDOOR UNIT
1. Electrical parts
(1)Remove the service value cover lock screws
and lower the cover to remove it.
(2)Remove the top cover lock screw and raise the
cover to remove it.
Fig. 3
MODEL RAC-50WP
OUTDOOR UNIT
1. Electrical parts
(1)Remove the service value cover lock screws
and lower the cover to remove it.
(2)Remove the top cover lock screw and raise the
cover to remove it.
Fig. 1
MODEL RAC-35WPC C
Procedure for Disassembly and Reassembly
19
Fig.
Fig. 2 4
(3)Remove the electrical box lock screw.
(4)Remove the terminal cover lock screw.
(5)Remove each connector and earth cable from
.xoblacirtceleehtevomer,nehT
.eriwdaeleht
(3)Remove the electrical box lock screw.
(4)Remove the terminal cover lock screw.
(5)Remove each connector and earth cable from
.xoblacirtceleehtevomer,nehT
.eriwdaeleht

L N
300-330
Main parts
L N
C021-C022,375 ,420V)
RAC-35WPC
1 5
DESCRIPTION OF MAIN CIRCUIT OPERATION
20