Hitachi RAC-25WXEN User manual

ROOM AIR CONDITIONER
OUTDOOR UNIT
SERVICE MANUAL
TECHNICAL INFORMATION
SPECIFICATIONS
After installation
OUTDOOR UNIT
Johnson Controls-Hitachi Air Conditioning Wuhu Co., Ltd.
JCH-WH
FOR SERVICE PERSONNEL ONLY
RAC-50WXEN
RAC-25WXEN
RAC-35WXEN
OUTDOOR UNIT OUTDOOR UNIT OUTDOOR UNIT
RAC-25W RAC-35W RAC-50W
(KW)
(B.T.U./h)
(KW)
(B.T.U./h)
W
792(+65)
600
299(+27.5)
38.2
H
D
MODEL
POWER SOURCE
TOTAL INPUT (W)
TOTAL AMPERES (A)
CAPACITY
COOLING
HEATING
TOTAL INPUT (W
TOTAL AMPERES (A)
CAPACITY
814 (250 1,400)
DIMENSIONS
(mm)
1,397 (500 2,100)
593 (250 1,200)
NET WEIGHT (Kg)
TYPE DC INVERTER
1 PHASE,50Hz,220-230V 1 PHASE,50Hz,220-230V 1 PHASE,50Hz,220-230V
481 (250 1,000)
2.73-2.61
3.20 (0.90 4.20)
10,920 (3,070 14,330)
3.74-3.57
3.67-3.51
13,650 (3,070 16,380)
2.92-2.79
2.50 (0.90 3.10)
8,530 (3,070 10,580)
6.36-6.09
3.50 (0.90 4.00) 5.00 (1.90 5.20)
11,940 (3,070 13,650)
17,060 (6,480 17,740)
6.44-6.16
1,415 (500 2,700)
4.00 (0.90 4.80) 5.80 (2.20 7.00)
XEN XEN XEN
792(+65)
600
299(+27.5)
38.2
800(+63)
736
350(+35.5)
51.7
800 (250 1,600)
RAC-25WXEN
RAC-35WXEN
RAC-50WXEN
19,790 (7,510 23,880)
REFER TO THE FOUNDATION MANUAL
CONTENTS
SPECIFICATIONS ------------------------------------------------------- 6
CONSTRUCTION AND DIMENSIONAL DIAGRAM ------------ 9
MAIN PARTS COMPONENT ----------------------------------------- 11
WIRING DIAGRAM ------------------------------------------------------ 13
BLOCK DIAGRAM ------------------------------------------------------- 15
SHEATHED HEATER --------------------------------------------------- 16
REFRIGERATING CYCLE DIAGRAM ------------------------------ 18
PROCEDURE FOR DISASSEMBLY AND REASSEMBLY---- 20
DESCRIPTION OF MAIN CIRCUIT OPERATION --------------- 21
SERVICE CALL Q & A -------------------------------------------------- 31
TROUBLE SHOOTING -------------------------------------------------- 35
PARTS LIST AND DIAGRAM ------------------------------------------ 48
NO.0123E
1

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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 IC40 1TH1 , 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

!
CAUTION
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 break er for safety.
3. In the event of power failure,the room air conditioner will restare automatically in the previously selected
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
–20°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.
5

SPECIFICATIONS
3
RAC-25/35WXEN
SHEATHED HEATER 200W(AC 230V)
RAC-50WXEN
6

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
Figure showing the installation of Outdoor unit
MODEL RAC-25WXEN
RAC-35WXEN
7

Therefrigerating 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 insulatorwill deteriorate if
it is not wrapped with tape).
The connection of insulated drain
hose.
Inner diameter 16mm
Please use insulated drain hosefor
the indoor piping (commercial
product)
Maximum pipe length 30m Minimum pipe length 3m
Figure showing the installation of lndoor and Outdoor unit
MODEL RAC-50WXEN
above 200mm
above
200mm
give clearance
as wide as
possible
above 300mm
above 700mm
above 150mm
8

Unit : mm
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
CONSTRUCTION AND DIMENSIONAL DIAGRAM
MODEL RAC-25/35WXEN
OUTDOOR UNIT
More
than
200
More than
More than
300
600
345
299
202
163.5
589
92
59
792
877
55
57
190
147
12
(11)
Drain hole
Drain hole
Drain hole
(27)
9

Unit : mm
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
CONSTRUCTION AND DIMENSIONAL DIAGRAM
MODEL RAC-50WXEN
OUTDOOR UNIT
More
than
200
880.5
800 74
6.5
736
408.5
350
111.5
(35.5) (23)
(30)
706
175
103.5
543.5 133
12
50
395 361 10
202.5
More
than
50
More
than
100
More
than
700
More
than
200
10

MAIN PARTS COMPONENT
FAN MOTOR
MAIN ELECTRIC COMPONENTS FOR OUTDOOR UNIT
Fan Motor Specifications
BLU : BLUE YEL : YELLOW BRN : BROWN WHT : WHITE
GRY : GRAY ORN : ORANGE GRN : GREEN RED : RED
BLK : BLACK PNK : PINK VIO : VIOLET
RAC-25/35/50WXEN
THERMOSTAT (Room temperature Thermistor)
CONNECTION
MODEL
ECRUOS REWOP
TUPTUO
V083 - 021 : CD
W74
WHT(V)
BLK(W)
M
M
M
RED(U)
PARTS NAMERESISTANCE VALUE(Ω)APPLICABLE MODELS
COIL(REVERSING VALVE) RAC-25/35/50WXEN
46Ω/PHASE（AT 20 ）RAC-25/35/50WXEN
2780Ω（ 0 ）
COIL(EXPANSION VALVE)
REACTOR5.3 (mH) 67 mΩ
MAX (20 °C) RAC-25/35/50WXEN
SHEATHED HEATER 266ΩRAC-25/35/50WXEN
(20 °C)
11

COMPRESSOR MOTOR
MODEL
COMPRESSOR TYPE
POWER SOURCE
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
75
220 - 350 V
2M = 1.354 2M = 1.354
M
RAC-50WXENRAC-25/35WXEN
RAC-25/35/50WXEN
220 - 350 V
OUTPUT
1400W
GTD141UKQA8JT6
GSD102UKQA6JT6A
790W
12

WIRING DIAGRAM
MODEL RAC-25/35/50WXEN
13

MODEL RAC-25/35/50WXEN
14

BLOCK DIAGRAM
MODEL RAC-25/35/50WXEN
1
2
3
EEPROM
Relay drive circuit
Reversing valve
drive circuit
Electric expansion
valve drive circuit
Sheathed
Sheathed heater
heater circuit
Electric expansion
valve
Reversing valve
Outdoor
Fan motor
Is
Ip
Id
Ip
Id
(AX-16G814)
series
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
15

Before setting the switch, make sure to turn OFF
power supply and then set the position of the switch
otherwise will cause damage to the Main PCB.
-16.1℃
-0.1℃
HI
HI
LO
LO
SWITCH POSITION OPEN THE TEMPERATURE
NOTE:
2.See page 17 for a detailed description of the
1.Factory default setting is at LO.
sheathed heater.
SHEATHED HEATER TO SELECT
SWITCH LO OR HI
!
CAUTION
SHEATHED HEATER
MODEL RAC-25/35/50WXEN
16

Select Switch Lo Hi
Heating Operation Defrost Thermo Heating Operation Defrost Thermo
Normal mode Off Normal mode Off
Power ON -16.1℃Power ON - .1℃
Power OFF -13.1℃Power OFF 2.9℃
Power ON Power OFF Power ON Power OFF
Outdoor Temp.
------ON-
------ON-
------ON-
------ON-
------ON-
------ON-
------ON-
------ON-
- - - - - ON ON -
- - - - - ON ON -
- - - - - ON ON -
- - - - ON ON ON -
- - - - ON ON ON -
- - - - ON ON ON -
- - - - ON ON ON -
- - - - ON ON ON -
- - - - ON ON ON -
- - - - ON ON ON -
- - - - ON ON ON -
- - - - ON ON ON -
- - - - ON ON ON -
- - - - ON ON ON -
- - - - ON ON ON -
- ON - - ON ON ON -
- ON - - ON ON ON -
- ON - - ON ON ON -
ON ON ON - ON ON ON -
ON ON ON - ON ON ON -
ON ON ON - ON ON ON -
ON ON ON - ON ON ON -
ON ON ON - ON ON ON -
ON ON ON - ON ON ON -
ON ON ON - ON ON ON -
ON ON ON - ON ON ON -
ON ON ON - ON ON ON -
ON ON ON - ON ON ON -
ON ON ON - ON ON ON -
ON ON ON - ON ON ON -
ON ON ON - ON ON ON -
ON ON ON - ON ON ON -
ON ON ON - ON ON ON -
-25℃
-26℃
-27℃
-28℃
-29℃
-3 ℃
-19℃
-2 ℃
-21℃
-22℃
-23℃
-24℃
-13℃
-14℃
-15℃
-16℃
-17℃
-18℃
-7℃
-8℃
-9℃
-1 ℃
-11℃
-12℃
-1℃
-2℃
-3℃
-4℃
-5℃
-6℃
5℃
4℃
3℃
2℃
1℃
℃
1 ℃
9℃
8℃
7℃
6℃
Basic Sheathed Heater Operation
17

COOLING CYCLE
OUTDOOR UNIT
HEATING CYCLE
OUTDOOR UNIT
MODEL RAC-25/35WXEN
Indoor unit
Silencer
Silencer
Silencer
Indoor unit
Silencer Silencer
Silencer
18

COOLING CYCLE
OUTDOOR UNIT
HEATING CYCLE
OUTDOOR UNIT
MODEL RAC-50WXEN
Indoor unit
Silencer Silencer
Indoor unit
Silencer Silencer
Silencer
Silencer
19

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-50WXEN
(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
OUTDOOR UNIT
MODEL RAC-25/ 35WXEN
1. Electrical parts
Procedure for Disassembly and Reassembly
Fig. 2
(3)Remove the electrical box lock screw.
(4)Remove the terminal cover lock screw.
(5)Remove each connector and earth cable from
. xob lacirtcele eht evomer,nehT
.eriw dael eht
(3)Remove the front cover lock screw.
(4)Lower the right side of the front cover and pull
it forward. Then, remove the cover from the
hook.
(5)Pull the right side of the front cover a little and
pull up the left side to remove it from the hook.
Fig. 4
(6)Remove each connector and earth cable from
the lead wire. Then,remove the electrical box .
20