Hitachi RAC-25WPB User manual

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
ROOM AIR CONDITIONER
INDOOR UNIT + OUTDOOR UNIT
SERVICE MANUAL
REFER TO THE FOUNDATION MANUAL
TECHNICAL INFORMATION
FOR SERVICE PERSONNEL ONLY
SPECIFICATIONS
CONTENTS
SPECIFICATIONS ------------------------------------------------------------------- 6
HOW TO USE ----------------------------------------------------------------------10
CONSTRUCTION AND DIMENSIONAL DIAGRAM --------------------- 43
MAIN PARTS COMPONENT --------------------------------------------------- 48
WIRING DIAGRAM ---------------------------------------------------------------- 50
CIRCUIT DIAGRAM --------------------------------------------------------------- 52
After installation
BLOCK DIAGRAM ----------------------------------------------------------------- 55
BASIC MODE ----------------------------------------------------------------------- 56
REFRIGERATING CYCLE DIAGRAM --------------------------------------- 67
DESCRIPTION OF MAIN CIRCUIT OPERATION ----------------------- 73
SERVICE CALL Q & A ---------------------------------------------------------- 98
TROUBLE SHOOTING -----------------------------------------------------------102
PARTS LIST AND DIAGRAM --------------------------------------------------1
HHAW
RAK-18PPB/RAC-18WPB
RAK-25PPB/RAC-25WPB
RAK-35PPB/RAC-35WPB
RAK-50PPB/RAC-50WPB
INDOOR UNITOUTDOOR UNIT
INDOOR UNIT OUTDOOR UNIT INDOOR UNIT OUTDOOR UNIT INDOOR UNIT OUTDOOR UNIT INDOOR UNIT OUTDOOR UNIT
RAK-18P RAC-18W RAK-25P RAC-25W RAK-35P RAC-35W RAK-50P RAC-50W
(KW)
(B.T.U./h)
(KW)
(B.T.U./h)
W780 660([phone]([phone]([phone](+91)
H280 530 280 530 295 548 295 600
D218 278([phone]([phone](+27.5) 230 299(+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)
3.12-2.97
2.00 (0.90 2.50)
8,530 (3,070 10,580)
580 (250 970)
2.50 (0.90
27.57.5 27.57.5 3410 10
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 1 PHASE,50HZ,220-230V
550 ( 700 (250
)010 , 1 1,290)
4.56-4.36
3.40 (0.90 4.40)
11,600 (3,070 15,010)
4.87-4.66
1,100 (250 1,700)
5.51-5.27
14,330 (3,070 17,060)
3.75-3.59
2.50 (0.90 3.10)
8,530 (3,070 10,580)
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)
250
Hitachi Household Appliances(Wuhu) Co., Ltd.
PB PB PB PB PB PB PB PB
RAC-18WPB
RAC-25WPB
RAK-18PPB
RAK-25PPB
RAC-50WPB
RAC-35WPB
1 PHASE,50HZ,220-230V
RAK-35PPB
RAK-50PPB
NO.0080E-3
38
40
PROCEDURE FOR DISASSEMBLY AND REASSEMBLY-------------70
RAR-5E2
RAR-5E1

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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-18WPB RAC-35 PB
NO
NO
–
NO
NO
NO
NO
YES
NO
NO
YES(IC)
YES
---------- 1050g 1250g
ASD084SFNA7JK1
RAK-18PPB
RAC-25WPB
RAK-25PPB
RAK-35PPB
RAK-50PPB
W
(MIN. 3m)
47W (DC120~380V)
30W (DC325 V)
950g
RAC- PB50W
5RS132ZBA21
3.15A 15A, 2A, 3A, 3.15A 25A, 2A, 3A, 3.15A
NO
YES
450NR, ERZVA431
450NR
R
6
YES

Figure showing the installation of lndoor and Outdoor unit
MODEL RAK-18PP /RAC-18WP
B B
RAK-25PP /RAC-25WPB B above
50mm
above 50mm
above 50mm
m
m
0
0
3
t
u
o
b
a
m
5
4
.
0
t
u
o
b
a
d
n
e
b
t
o
n
t
s
u
m
The indoor piping should be
insulated with the enclosed
insulation pipe. (If the insulator is
insufficient, please use commercial
products.)
•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)
Be sure to
completely
seal any gap
with putty.
2,300 mm or more
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.
Plug
Maximum pipe length 20m Minimum pipe length 3m
give clear
as wide a
possible
200mm
above 200mm
above 100mm
300mm
above
above 50mm
7
above

Figure showing the installation of lndoor and Outdoor unit
MODEL RAK-35PP /RAC-35WP
B B
above
50mm
above 50mm
above 50mm
t
u
o
b
a300mm
a
t
u
o
b0.45m
must
t
o
nbend
The indoor piping should be
insulated with the enclosed
insulation pipe. (If the insulator is
insufficient, please use commercial
products.)
sThe refrigerating machine oil is
easily affected by moisture. Use
caution to prevent water from
entering the cycle.
sThe difference in height between
the indoor and outdoor unit
should be kept below 10m.
sThe 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
Be sure to
completely
seal any gap
with putty.
above 50 mm when
installed on the
ceiling of balcony
above 200mm
2,300 mm or more
Maximum pipe length 20m Minimum pipe length m3
Plug
8

Figure showing the installation of lndoor and Outdoor unit
MODEL RAK-50PPB/RAC-50WPB
above
50mm
above 50mm
above 50mm
t
u
o
b
a 300mm
a
t
u
o
b 0.45m
must
t
o
n bend
The indoor piping should be
insulated with the enclosed
insulation pipe. (If the insulator is
insufficient, please use commercial
products.)
sThe refrigerating machine oil is
easily affected by moisture. Use
caution to prevent water from
entering the cycle.
sThe difference in height between
the indoor and outdoor unit
should be kept below 10m.
sThe 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
Be sure to
completely
seal any gap
with putty.
above 50 mm when
installed on the
ceiling of balcony
above 200mm
2,300 mm or more
Maximum pipe length 20m Minimum pipe length m3
3
Plug
9

ENGLISH
– 1 –
– 1 –
Remote Controller Manual
Remote Controller manual Page 1~27
To obtain the best performance and ensure years of trouble free use, please read this instruction manual completely.
MODEL
RAR-5E2
– 2 –
PREPARATION BEFORE OPERATION
1. Slide the cover to take it off. 2. Install two dry batteries AAA.LR03 (alkaline). The direction of the batteries should match the
marks in the case.
1. Choose a place from where the signals can reach the unit. 2. Fix the remote controller holder to a wall, a pillar or similar
location with the provided screws.
3. Place the remote controller in the remote controller holder.
Remote controller
Screws
Remote controller holder
ƵTo install the batteries
3. Replace the cover at its original position.
ƵTo fix the remote controller holder to the wall
NOTE
Notes on batteries ƽWhen replacing the batteries, use batteries of the same
type, and replace both old batteries together.
ƽWhen the system is not used for a long time, take the
batteries out.
ƽThe batteries will last for approximately 1 year. However, if
the remote controller display begins to fade and degradation of reception performance occurs within a year, replace both batteries with new size AAA.LR03 (alkaline).
ƽThe attached batteries are provided for the initial use of
the system.
The usable period of the batteries may be short depending
on the manufactured date of the air conditioner.
Notes on the remote controller
ƽNever expose the remote controller to direct sunlight. ƽDust on the signal transmitter or receiver will reduce the
sensitivity. Wipe off dust with soft cloth.
ƽSignal communication may be disabled if an electronic-
starter-type uorescent lamp (such as inverter-type lamps)
is in the room. Consult the shop if that is the case.
ƽIf the remote controller signals happen to operate another
appliance, move that appliance to somewhere else, or consult the service shop.
ƽWhen the remote controller is not in use, please close the
slide cover to prevent failure.
10