Hitachi RAF-25RXB User manual

TC
SERVICE MANUAL
TECHNICAL INFORMATION
REFER TO THE FOUNDATION MANUAL
ROOM AIR CONDITIONER
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
FOR SERVICE PERSONNEL ONLY
NO. 0842E
RAF-35RXB/RAC-35FXB
RAF-50RXB/RAC-50FXB
RAF-25RXB/RAC-25FXB
SPECIFICATIONS
INDOOR UNIT + OUTDOOR UNIT
FEBRUARY 2015 Hitachi Appliances, Inc.
※After installation
CONTENTS
SPECIFICATIONS---------------------------------------------------- 1−1
HOW TO USE---------------------------------------------------------- 2−1
CONSTRUCTION AND DIMENSIONAL DIAGRAM---------- 3−1
MAIN PARTS COMPONENT--------------------------------------- 4−1
WIRING DIAGRAM--------------------------------------------------- 5−1
CIRCUIT DIAGRAM-------------------------------------------------- 6−1
BLOCK DIAGRAM---------------------------------------------------- 7−1
BASIC MODE---------------------------------------------------------- 8−1
REFRIGERATING CYCLE DIAGRAM -------------------------- 9−1
PROCEDURE FOR DISASSEMBLY AND REASSEMBLY -----10−1
DESCRIPTION OF MAIN CIRCUIT OPERATION------------11−1
SERVICE CALL Q & A-----------------------------------------------12−1
TROUBLE SHOOTING----------------------------------------------13−1
VARIOUS SETTINGS------------------------------------------------14−1
PARTS LIST AND DIAGRAM-------------------------------------- 15−1
INDOOR UNIT
OUTDOOR UNIT
RAC-50FXB
RAC-35FXB
RAC-25FXB
RAF-25RXB
RAF-35RXB
RAF-50RXB
INDOOR UNIT OUTDOOR UNIT INDOOR UNIT OUTDOOR UNIT INDOOR UNIT OUTDOOR UNIT
RAF-25RXB RAC-25FXB RAF-35RXB RAC-35FXB RAF-50RXB RAC-50FXB
(KW)
(B.T.U./h)
750
590
215
15
750(+65)
548
288(+27.5)
34
W
H
D
MODEL
POWER SOURCE
TOTAL INPUT (W)
TOTAL AMPERES (A)
CAPACITY
(KW)
(B.T.U./h)
TOTAL INPUT (W)
TOTAL AMPERES (A)
CAPACITY
COOLING
HEATING
DIMENSIONS
(mm)
NET WEIGHT (Kg)
TYPE DC INVERTER
1 PHASE, 50HZ, 220-230V 1 PHASE, 50HZ, 220-230V 1 PHASE, 50HZ, 220-230V
580(155-1,180)
3.11-2.97
2.50(0.90-3.10)
8,530(3,070-10,580)
790(115-1,120)
3.99-3.82
3.4(0.9-4.4)
11,600(3,070-15,010)
750
590
215
15
750(+65)
548
288(+27.5)
34
1,020(155-1,300)
4.80-4.67
3.50(0.90-4.00)
11,940(3,070-13,650)
1,220(115-1,300)
5.84-5.58
4.5(0.9-5.0)
15,350(3,070-17,060)
750
590
215
15
800(+63)
736
350(+35.5)
49.5
1,560(155-1,950)
7.16-6.85
5.00(0.90-5.20)
17,060(3,070-17,740)
1,780(115-2,100)
8.17-7.82
6.5(0.9-8.1)
22,180(3,070-27,640)

1. In order to disassemble and repair the
unit in question, be sure to 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.
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 the user himself should
absolutely be prohibited.
6. Tools and measuring instruments for use in repairs or inspection should be accurately calibrated in
advance.
7. In installing the unit having been repaired, be careful to prevent the occurrence of any accident such as
electrical shock, leak of current, or bodily injury due to the drop 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 1MΩor more as measured by a 500V DC megger.
9. The initial location of installation such as window, floor or the other should be checked for being safe
enough to support the repaired unit again.
If it is found not so strong and safe, the unit should be installed at the initial location after reinforced or
at a new location.
10. Any inflammable object must not be placed
about the location of installation.
11. Check the grounding to see whether it is
proper or not, and if it is found improper,
connect the grounding terminal to the earth.
Spray
gasoline
gasbombe
thinner
1. SAFETY DURING REPAIR WORK
If the contacts of electrical
parts are defective, replace
the electrical parts without
trying to repair them
1
2
3
4
5

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

This䚷manualdescribesonlypointsthatdifferfrom
RAMͲ33NP2B(PMNo.0581E)
RAMͲ40NP2B(PMNo.0582E)
RAMͲ53NP2B,RAMͲ53NP3B(PMNo.0583E)
RAMͲ68NP3B(PMNo.0584E)
RAMͲ70NP4B(PMNo.0585E)
RAMͲ90NP5B(PMNo.0586E)
RAMͲ110NP6B(PMNo.0587E)
foritemsnotdescribedinthismanual.
Combinationtable
RAFͲ25RXB RAFͲ35RXB RAFͲ50RXB
RACͲ25FXB RACͲ35FXB RACͲ50FXB
RAMͲ33NP2B oͲͲ
RAMͲ40NP2B oo Ͳ
RAMͲ53NP2B ooo
RAMͲ53NP3B ooo
RAMͲ68NP3B ooo
RAMͲ70NP4B ooo
RAMͲ90NP5B ooo
RAMͲ110NP6B ooo
Indoorunit
Singleoutdoorunit
Multi
outdoorunit

1ー1
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
YES(IC)
NO
WITHOUT REFRIGERANT BECAUSE
COUPLING IS FLARE TYPE.
UNI T
PIPES
MAX. 30m
MIN.3m
MAX. 20m
MIN.3m
REFRIGERANT CHARGING
VOLUME
(Refrigerant 410A)
NO
NO
–
NO
NO
NO
NO
YES
NO
NO
YES(IC)
YES
----------
NO
ASG133CDNB7AT
870g 1400g
ASD084SFNA7JK1
RAF-25RXB
RAF-35RXB
RAF-50RXB RAC-50FXBRAC-35FXBRAC-25FXB
47W (DC120~380V)
870g
30W (DC325V)
3.15A 15A, 2A, 3A, 3.15A 25A, 2A, 3A, 3.15A
450NR
YES
450NR, ERZVA431
R
YES
YES(INTERNAL)

1ー2
Figure showing the installation of lndoor and Outdoor unit
MODEL RAF-25RXB/RAC-25FXB
RAF-35RXB/RAC-35FXB
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 3m
Plug
Sheet
Hanger
Be sure to completely
seal any gap with
putty.
Drain pipe
Must be installed separately.
Insulate indoor part of pipe
to prevent condensation.
The indoor piping should be
insulated with the enclosed
insulation pipe.(If the insulator
is insufficient, please use
commercial products.)
Above 100mm
Above 150mm
Above 200mm
Bush
When mounting on a wall
(up to 150~500 mm from the floor surface)
(For example:wall instalation)

1ー3
Figure showing the installation of lndoor and Outdoor unit
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)
Maximum pipe length 30m Minimum pipe length 3m
Plug
above 200mm
above
200mm
give clearance
as wide as
possible
above 300mm
above 700mm
above 150mm
Sheet
Hanger
Be sure to completely
seal any gap with
putty.
Drain pipe
Must be installed separately.
Insulate indoor part of pipe
to prevent condensation.
The indoor piping should be
insulated with the enclosed
insulation pipe.(If the insulator
is insufficient, please use
commercial products.)
Above 100mm
Above 150mm
Above 200mm
Bush
When mounting on a wall
(up to 150~500 mm from the floor surface)
(For example:wall instalation)
MODEL RAF-50RXB/RAC-50FXB

– 1 –
Remote Controller Manual
Remote Controller manual Page 1~28
To obtain the best performance and ensure years of trouble free use, please read this instruction manual completely.
MODEL
RAR-6N4
– 2 –
PREPARATION BEFORE OPERATION
■To install the batteries
■To fix the remote controller holder to the wall
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.
3. Replace the cover at its original position. 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.
NOTE
Notes on batteries ●When replacing the batteries, use batteries of the same
type, and replace both old batteries together.
●When the system is not used for a long time, take the
batteries out.
● 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).
● 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 ● Never expose the remote controller to direct sunlight. ● Dust on the signal transmitter or receiver will reduce the
sensitivity. Wipe off dust with soft cloth.
● Signal communication may be disabled if an electronic-
starter-type Ûuorescent lamp (such as inverter-type lamps) is in the room. Consult the shop if that is the case.
●If the remote controller signals happen to operate another
appliance, move that appliance to somewhere else, or consult the service shop.
●When the remote controller is not in use, please close the
slide cover to prevent failure.
Remote controller
Screws
Remote controller holder
HOW TO USE
MODEL RAF-25RXB / RAC-25FXB, RAF-35RXB / RAC-35FXB, RAF-50RXB / RAC-50FXB
2ー1