Hitachi RAC-18WEC 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 ----------------------------------------------------------------------- 9
CONSTRUCTION AND DIMENSIONAL DIAGRAM --------------------- 18
MAIN PARTS COMPONENT --------------------------------------------------- 21
WIRING DIAGRAM ---------------------------------------------------------------- 23
CIRCUIT DIAGRAM --------------------------------------------------------------- 25
After installation
BLOCK DIAGRAM ----------------------------------------------------------------- 28
BASIC MODE ----------------------------------------------------------------------- 29
REFRIGERATING CYCLE DIAGRAM --------------------------------------- 39
DESCRIPTION OF MAIN CIRCUIT OPERATION ----------------------- 45
SERVICE CALL Q & A ---------------------------------------------------------- 70
TROUBLE SHOOTING ----------------------------------------------------------- 73
PARTS LIST AND DIAGRAM --------------------------------------------------105
HHAW
INDOOR UNITOUTDOOR UNIT
INDOOR UNIT OUTDOOR UNIT INDOOR UNIT OUTDOOR UNIT INDOOR UNIT OUTDOOR UNIT INDOOR UNIT OUTDOOR UNIT
RAK-18PEC RAC-18WEC
RAK-25PEC
RAK-25PECC RAC-25WEC RAC-35WEC
RAC-10WECI RAC-14WECI
RAK-10PECI
RAK-35PEC
RAK-35PECC
RAK-14PECI
RAK-50PEC
RAK-50PECC
RAK-20PECI
RAC-50WEC
RAC-20WECI
(KW)
(B.T.U./h)
(KW)
(B.T.U./h)
W 780 660([phone]([phone]([phone](+91)
H 280 530 280 530 280 530 280 600
D 218 278([phone]([phone]([phone](+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)
3.19-3.05
2.00 (0.90 2.50)
6,820 (3,070 8,530)
620 (250 970)
2.50 (0.90 3.20)
3.62-3.46
7.5 24.5 7.5 24.5 7.5 27.5 40
8,530 (3,070 10,920)
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 1 PHASE,50Hz, 220-230V
580 ( 700 (250 1,290)1,010)
4.56-4.36
3.40 (0.90 4.40)
11,600 (3,070 15,010)
5.41-5.18
1,100 (250 1,700)
5.36-5.13
14,330 (3,070 17,060)
3.84-3.67
2.50 (0.90 3.10)
8,530 (3,070 10,580)
7.29-6.85
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)
7.56-7.23
1,660 (500 2,750)
4.20 (0.90 5.00) 6.00 (2.20 7.30)
250
Hitachi Household Appliances(Wuhu) Co., Ltd.
NO. 0093E
8
PROCEDURE FOR DISASSEMBLY AND REASSEMBLY------------- 42
L.H
RAK-18PEC/RAC-18WEC
RAK-35PEC/RAC-35WEC
RAK-50PEC/RAC-50WEC
RAK-25PEC/RAC-25WEC
RAK-35PECC/RAC-35WEC
RAK-50PECC/RAC-50WEC
RAK-25PECC/RAC-25WEC
RAK-14PECI/RAC-14WECI
RAK-20PECI/RAC-20WECI
RAK-10PECI/RAC-10WECI
RAK-18PEC
RAK-25PEC
RAK-35PEC
RAK-50PEC
RAK-25PECC
RAK-35PECC
RAK-50PECC
RAK-10PECI
RAK-14PECI
RAK-20PECI
RAC-18WEC
RAC-25WEC
RAC-35WEC
RAC-10WECI
RAC-14WECI
RAC-50WEC
RAC-20WECI

 



 


 

 

 

 

 

 

 
 



 

 







 








DANGER


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


(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


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


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
G4A-1A
NO
NO
YES
YES
450NR, ERZVA431
YES
YES(IC)
NO
WITHOUT REFRIGERANT BECAUSE
COUPLING IS FLARE TYPE.
UNIT
PIPES
(MAX. 20m)
REFRIGERANT CHARGING
VOLUME
(Refrigerant 410A)
950g
NO
NO
–
NO
NO
NO
3.15A
NO
YES
NO
YES
450NR
NO
YES(IC)
YES
----------
NO
ASG133CDNB7AT
1250g
ASD084SFNA7JK1
(MIN. 3m)
30W (DC325V) 4 W (DC120~380V)
15A, 2A, 3A, 3.15A
R
25A, 2A, 3A, 3.15A
YES(INTERNAL)
720g
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5
RAK-18PEC
RAK-25PEC
RAK-35PEC
RAK-50PEC
RAK-25PECC
RAK-35PECC
RAK-50PECC
RAK-10PECI
RAK-14PECI
RAK-20PECI
RAC-18WEC
RAC-25WEC RAC-35WEC
RAC-10WECI RAC-14WECI
RAC-50WEC
RAC-20WECI

Figure showing the installation of lndoor and Outdoor unit
above
50mm
above 50mm
above 50mm
mm003tuoba
m54.0tuoba
dnebtontsum
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)
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.
Maximum pipe length 20m Minimum pipe length 3m
50mm
give clear
as wide a
possible
200mm
above 200mm
above 100mm
300mm
Plug (Procure locally)
above
above
above

MODEL RAK-18PEC/RAC-18WEC
RAK-25PEC/RAC-25WEC
RAK-35PEC/RAC-35WEC
RAK-25PECC/RAC-25WEC
RAK-35PECC/RAC-35WEC
RAK-10PECI/RAC-10WECI
RAK-14PECI/RAC-14WECI

Figure showing the installation of lndoor and Outdoor unit
MODEL RAK-50PEC/RAC-50WEC
above
50mm
above 50mm
above 50mm
tuoba 300mm
atuob 0.45m
must ton 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 300mm
above 50mm
give clearance
as wide as
possible
above
200mm
Be sure to
completely
seal any gap
with putty.
above 200mm
2,300 mm or more
Plug (Procure locally)
Maximum pipe length 20m Minimum pipe length 3m

RAK-20PECI/RAC-20WECI
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.

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