Hitachi RAS-14EH1 Service Manual
  1. Manuals
  2. Brands
  3. Hitachi Manuals
  4. Air Conditioner
  5. RAS-14EH1
  6. Service manual
Hitachi RAS-14EH1 Service Manual

Hitachi RAS-14EH1 Service Manual

Hide thumbs Also See for RAS-14EH1:
Table of Contents

Advertisement

Quick Links

Download this manual
SERVICE MANUAL
TECHNICAL INFORMATION
FOR SERVICE PERSONNEL ONLY
SPECIFICATIONS
TYPE
MODEL
POWER SOURCE
TOTAL INPUT
TOTAL AMPERES
COOLING
CAPACITY
TOTAL INPUT
TOTAL AMPERES
HEATING
CAPACITY
DIMENSIONS
(mm)
NET WEIGHT
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
ROOM AIR CONDITIONER
FEBRUARY 2007 Hitachi Appliances, Inc.
RAS-14EH1
RAC-14EH1
INDOOR UNIT
RAS-14EH1
(W)
(A)
(kW)
(B.T.U./h)
(W)
(A)
(kW)
(B.T.U./h)
W
H
D
(kg)
INDOOR UNIT + OUTDOOR UNIT
TC
RAS-14EH1/RAC-14EH1
REFER TO THE FOUNDATION MANUAL
SPECIFICATIONS ------------------------------------------------------------------- 4
HOW TO USE ----------------------------------------------------------------------- 5
CONSTRUCTION AND DIMENSIONAL DIAGRAM --------------------- 15
MAIN PARTS COMPONENT --------------------------------------------------- 17
WIRING DIAGRAM ---------------------------------------------------------------- 19
CIRCUIT DIAGRAM --------------------------------------------------------------- 20
BLOCK DIAGRAM ----------------------------------------------------------------- 22
BASIC MODE ----------------------------------------------------------------------- 23
REFRIGERATING CYCLE DIAGRAM --------------------------------------- 29
DESCRIPTION OF MAIN CIRCUIT OPERATION ----------------------- 30
TROUBLE SHOOTING ----------------------------------------------------------- 61
PARTS LIST AND DIAGRAM -------------------------------------------------- 89
DC INVERTER (WALL TYPE)
1 PHASE, 50 Hz, 220-230V
1,090 (155 ~ 1,460)
5.22-4.99
3.50 (0.90 ~ 4.00)
11,940 (3,070 ~ 13,650)
1,110 (115 ~ 1,440)
5.32-5.09
4.20 (0.90 ~ 5.00)
14,330 (3,070 ~ 17,060)
780
280
220
9.5
NO. 0774E
CONTENTS
OUTDOOR UNIT
RAC-14EH1
750 (+91)
548
288 (+47)
35
After installation

Advertisement

Table of Contents
loading

Related Manuals for Hitachi RAS-14EH1

Summary of Contents for Hitachi RAS-14EH1

  • Page 1: Table Of Contents

    4.20 (0.90 ~ 5.00) CAPACITY (B.T.U./h) 14,330 (3,070 ~ 17,060) 750 (+91) DIMENSIONS (mm) 288 (+47) NET WEIGHT (kg) After installation SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT ROOM AIR CONDITIONER INDOOR UNIT + OUTDOOR UNIT FEBRUARY 2007 Hitachi Appliances, Inc.
  • Page 2 SAFETY DURING REPAIR WORK 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. 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.
  • Page 3 WORKING STANDARDS FOR PREVENTING BREAKAGE OF SEMICONDUCTORS Scope The standards provide for items to be generally observed in carrying and handling semiconductors in relative manufacturers during maintenance and handling thereof. (They apply the same to handling of abnormal goods such as rejected goods being returned). Object parts (1) Micro computer (2) Integrated circuits (IC)
  • Page 4 (6)Use a three wire type soldering iron including a grounding wire. Metal plate (of aluminium, stainless steel, etc.) Working table Resistor of 1 M (1/2W) Staple Earth wire Bare copper wire (for body earth) Fig. 3 Grounding of the working table Soldering iron Grounding wire...
  • Page 5 CAUTION In quiet operation or stopping the running, slight flowing noise of refrigerant in the refrigerating cycle is heard occasionally, but this noise is not abnormal for the operation. When it thunders near by, it is recommend to stop the operation and to disconnect the power cord plug from the power outlet for safety.

  • Page 6: Specifications

    SPECIFICATIONS RAC-14EH1 RAS-14EH1 MODEL FAN MOTOR 40 W PWM DC35V FAN MOTOR CAPACITOR FAN MOTOR PROTECTOR COMPRESSOR – ASC092CD-A8JK COMPRESSOR MOTOR CAPACITOR OVERLOAD PROTECTOR OVERHEAT PROTECTOR FUSE (for MICROPROCESSOR) 3.0A POWER RELAY POWER SWITCH TEMPORARY SWITCH SERVICE SWITCH TRANSFORMER VARISTOR...

  • Page 7: How To Use

    – 5 –...
  • Page 8 – 6 –...
  • Page 9 – 7 –...
  • Page 10 – 8 –...
  • Page 11 – 9 –...
  • Page 12 – 10 –...
  • Page 13 – 11 –...
  • Page 14 – 12 –...
  • Page 15 – 13 –...
  • Page 16 – 14 –...

  • Page 17: Construction And Dimensional Diagram

    CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAS-14EH1 INDOOR UNIT Unit : mm Service space Top air suction grill Front panel Mounting plate Cabinet Air outlet Horizontal air diflector Wireless remote controller (190) Drain When piping is drawn from the left side,...
  • Page 18 CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAC-14EH1 OUTDOOR UNIT Handle Handle Air outlet Air Suction grill Rear side Holes for anchor bolt (2 – ø12 x 6 slots for ø8.0 bolt) Notch for anchor bolt (for 2 – ø8.0 bolt) Drain hole Fixing hole Drain hole Service space...

  • Page 19: Main Parts Component

    MAIN PARTS COMPONENT THERMOSTAT Thermostat Specifications MODEL RAS-14EH1 THERMOSTAT MODEL OPERATION MODE COOL HEAT 16.7 (62.1) 18.7 (65.7) INDICATION 16.0 (60.8) 19.3 (66.7) TEMPERATURE 24.7 (76.5) 26.7 (80.1) INDICATION °C (°F) 24.0 (75.2) 27.3 (81.1) 32.7 (90.9) 34.7 (94.5) INDICATION 32.0 (89.6)
  • Page 20 COMPRESSOR MOTOR Compressor Motor Specifications MODEL RAC-14EH1 ITEM COMPRESSOR TYPE ASC092CD-A8JK POWER SOURCE DC 220 ~ 350 V OUTPUT 750W WHITE WINDING YELLOW 20°C 2M=1.15 RESISTANCE (Ω) 75°C 2M=1.40 YELLOW WHITE COMPRESSOR FRONT SIDE OF OUTDOOR UNIT 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.

  • Page 21: Wiring Diagram

    WIRING DIAGRAM CAUTION MODEL RAS-14EH1 / RAC-14EH1 The marked parts very important ones for safety. – 19 –...

  • Page 22: Circuit Diagram

    CIRCUIT DIAGRAM RAS-14EH1 – 20 –...
  • Page 23 MODEL RAC-14EH1 P Q 1 P Q 2 P Q 4 0 1 P Q 4 0 2 P Q 4 0 3 P Q 4 0 4 P Q 7 0 1 SELF-CHECK SELF-MODE SERVICE SW AX-8T11 – 21 –...

  • Page 24: Block Diagram

    BLOCK DIAGRAM MODEL RAS-14EH1 / RAC-14EH1 INDOOR UNIT OUTDOOR UNIT Outdoor DC fan motor Power source 1ø 50Hz 220-230V HARMONICS POWER POWER RELAY IMPROVEMENT SWITCH RECTIFIER CIRCUIT Inrush current DC compressor Protection circuit motor Rotor magnetic pole position detection circuit...

  • Page 25: Basic Mode

    RAS-14EH1 – 23 –...
  • Page 26 Table 1 Mode data file RAS-14EH1 LABEL NAME VALUE 5200 min WMAX 5200 min WMAX2 5050 min WSTD 3800 min WBEMAX 4800 min CMAX 4800 min CMAX2 4300 min CSTD 4200 min CKYMAX 3400 min CJKMAX 2900 min CBEMAX 2500 min...
  • Page 27 Table 1 Thermo judgment Item Temperature Thermo judgment (ON) 30°C Room CLMXTP temperature Thermo judgment (OFF) 32°C Thermo judgment (ON) 32°C Outdoor temperature Thermo judgment (OFF) 33°C Table 2 Compressor speed Calculated Temperature compressor difference speed (with shift value) –1 1.66°C 3500 min button...
  • Page 28 Cooling Sleep Operation Dehumidifying Operation Room temperature 7 hr 1 hr Set to 7 hours Sleep button Operation lamp Timer lamp Remote control (Sleep) ON See basic Start Stop button Indoor fan operation Sleep Lo Outdoor fan Horizontal air Shut deflector Horizontal Facing down...
  • Page 29 Table 3 Compressor speed Basic Heating Operation Calculated Temperature compressor difference speed (with shift value) 3500 min –1 1.66°C 3900 min –1 2.00°C Heating set temperature –1 4300 min 2.33°C (remote control set temperature (+)) 4700 min –1 2.66°C 5100 min –1 3.00°C Dash period...
  • Page 30 Heating Sleep Operation Reversing Valve Defrosting Preheating released Sleep button Reversing valve (cooling "on" model) 2min. 30sec. Sleep Lo Notes: (1) The defrosting inhibit period is set as shown in the diagram below. When defrosting has finished once, the inhibit period is newly set, based on the outdoor temperature when the compressor was started. During this period, the defrost signal is not accepted.

  • Page 31: Refrigerating Cycle Diagram

    RAS-14EH1 / RAC-14EH1 Silencer Reversing Service valve Single-ended union valve Charge port Silencer Electric Expansion valve Single-ended Service valve union Strainer Strainer Silencer Reversing valve Service valve Single-ended union Charge port Silencer Electric Expansion valve Single-ended Service valve union Strainer Strainer –...

  • Page 32: Description Of Main Circuit Operation

    DESCRIPTION OF MAIN CIRCUIT OPERATION MODEL RAS-14EH1 1. Reset Circuit NORMAL : HI RESET : LO Microcomputer R552 IC521 Fig. 1-1 Power "OFF" Power "ON" Voltage 5.0V Voltage supply to pin 2 of IC521 Reset enter at 4.2V Reset release at 4.4V Voltage 5.0V...
  • Page 33 2. Receiver Circuit Q141 R212 L201 R141 ZD141 C212 C211 RECEIVER I/P R211 R611 C611 Microcomputer Fig.2-1 IRR (light receiver unit) receives the infrared signal from the wireless remote controller. The receiver amplifies and shapes the signal and outputs it. 3.
  • Page 34 4. Auto Sweep Motor Circuit Auto sweep motor for horizontal air defectors IC711 Microcomputer Rotor Fig.4-1 Fig. 4-1 shows the Auto sweep motor drive circuit; the signals shown in Fig.4-2 are output from pin E~H of microcomputer. Step width : 10ms Micro computer pins Horizontal air deflectors Fig.4-2 Microcomputer Output Signals...
  • Page 35 5. Initial Setting Circuit (IC401) • When power is supplied, the microcomputer reads the data in IC401 or IC402 (E PROM) and sets the preheating activation value and the rating and maximum speed of the compressor, etc. to their initial values. •...
  • Page 36 7. Fan Motor Drive Circuit CN10 Micro computer DC fan motor output Fan motor R751 C751 DC fan motor Speed feedback R631 C631 Fig. 7-1 Voltage at point A Waveform T1 = Low speed T2 = High speed Voltage at point B Waveform Voltage at point C Waveform...
  • Page 37 MODEL RAC-14EH1 1. The electrical parts for the outdoor unit is composed of two P.W.B. (a power P.W.B. and main P.W.B.) and a harmonics improvement circuit as shown in Fig. 1-1. • Main P.W.B. This P.W.B. is equipped with the rectification diode, DC fan motor control circuit and the circuits around the micro computer which take various controls.
  • Page 38 2. Power circuit This circuit is to convert the power from AC which is provided from the terminal A and B to DC voltage. And produces an AC current which does not exceed the harmonic amplitude limit of the IEC61000-3-2. When the compressor is stopped, the AC voltage becomes about 300 V and while the compressor operates, it is about 280 V.
  • Page 39 (3) C021 and C022 This smoothes the voltage rectified for operating the compressor. When the input voltage is taken for the sine wave as shown in the top of Fig. 2-4, it is rectified by the DB2 and becomes the waveform as shown in the middle of Fig.
  • Page 40 3. Indoor/Outdoor Interface Circuit The interface circuit superimposes an interface signal on the DC 35V line to perform communications between indoor and outdoor units. This circuit consists of a transmitting circuit which superimposes an interface signal transmit from the microcomputer on the DC 35V line and a circuit which detects the interface signal on the DC 35V line.
  • Page 41 Fig. 3-1 shows the interface circuit used for the indoor and outdoor microcomputers to communicate with each other. Control P.W.B. Fig. 3-1 – 39 –...
  • Page 42 Outdoor microcomputer Pin 11 Pin 68 Indoor microcomputer Pin 50 Pin 49 35V DC line 33ms. 100ms. 1 frame Leader Fig. 3-2 Voltages Waveforms of Indoor / Outdoor Microcomputers (Outdoor to Indoor Communications) Outdoor microcomputer Pin 11 Pin 68 Indoor microcomputer Pin 50 Pin 49 35V DC line 4.95ms.
  • Page 43 – 41 –...
  • Page 44 Compressor minimum rotation speed(4 MSB) Compressor minimum rotation speed(3) Compressor minimum rotation speed(2) Compressor minimum rotation speed(1) Compressor minimum rotation speed(0 LSB) OVL up Fan-7-step request 15/20(A) Actual compressor rotation speed(5 MSB) Compressor command speed(7 MSB) Actual compressor rotation speed(4) Compressor command speed(6) Actual compressor rotation speed(3) Compressor command speed(5)
  • Page 45 4. IPM (Intelligent Power Module) • Fig.4-1 shows the intelligent power module and its peripheral circuit. The three transistors on the positive E side are called the upper arm, and the three transistors on the negative D side, the lower arm. is ON, V - is ON) Fig.
  • Page 46 Intelligent power module switches power supply current according to position of the compressor motor rotor. The switching order is as shown in Fig. 4-2. At point E: U + is ON, V - is ON (circuit in Fig. 4-1) At point F: U + is chopped (OFF), V - is ON (circuit in Fig. 4-4) Upper arm transistor Time...
  • Page 47 – Fig. 4-4 Power module circuit (U is OFF, V is ON) Since current flows at point B only when U + transistor and V - transistor are ON, the current waveform at point B becomes intermittent waveform as shown in Fig. 4-3. Since current at point B is approximately proportional to the input current of the air conditioner, input current is controlled by using DC current (Id) detection resistor.
  • Page 48 • IPM drive circuit The inverter driving device (IGBT) and the drive circuit are built in the IPM. The IPM receives the signal from the microcomputer and convert it to 0 – 15 V signal to drive the IGBT. When the unit operates at low speed, a chopper signal is emitted from the micro computer as shown in Fig.
  • Page 49 5. Power Circuit for P.W.B. • Fig. 5-1 shows the power circuit for P.W.B. A C 2 2 0 - 2 3 0 V • In the power circuit for P.W.B., power supply for microcomputer, peripheral circuits, and IPM driver circuit and, as well as DC 35V, are produced by switching power circuit.
  • Page 50 • The voltage specification of the power circuit is as follows. <Check points> Output Voltage Main load Measuring points Potential failure modes spec. – 11-13V MAIN P.W.B. (CN3, CN4) R701 (“12V” display) R006 (“0V” display) The unit won’t operate C21 (“12V” display) J27, J30 MAIN P.W.B.
  • Page 51 6. Microcpomputer's Peripheral Circuits 6-1. Overload control circuit (OVL control circuit) Overload control is to decrease the speed of the compressor and reduce the load when the load on the air conditioner increases to an overload state, in order to protect the compressor, electronic components and power breaker.
  • Page 52 Detection DC Current Resistor Direct Current R003 R004 Q501 R513 Power P.W.B. R514 R906 R613 Microcomputer R612 R248 R245 R222 CN4B CN4A C009 R005 D001 R287 D208 Reset output Reset R288 R252 0V 0V 0V Main P.W.B. Fig. 6-2 (1) IS OVL Current transformer CT1 reads the input flowing current and detected to the microcomputer as a voltage signal.
  • Page 53 R003,R004,R608,R613, detect the DC voltage at the power circuit. The microcomputer receives a DC voltage and applies correction to the overload set value so the DC current will be low when the DC voltage is high. (Since the load level is indicated by the DC voltage multiplied by DC current, R247, R248, R249 are provided to perform the same overload judgement even when the voltage varies.) DC voltage : Low DC current : High...
  • Page 54 6-2. Reset Circuit MAIN P.W.B. D208 R287 Microcomputer RESET OUT. R252 RESET C204 IC5(1/2) R288 0V 0V 0V 0V Fig. 6-7 The reset circuit initializes the microcomputer program when Power is “ON” from “OFF”. Low voltage at pin h resets the microcomputer, and HI activates the microcomputer Fig.
  • Page 55 7. Temperature Detection Circuit MAIN P.W.B. O.H. thermistor R304 C304 R301 DEF. thermistor Microcomputer R305 C303 R302 Outdoor temperature thermistor CN10 R306 Outdoor temperature C302 R303 Fig. 7-1 The Over heat thermistor circuit detects the temperature at the surface of the compressor head, the Defrost. thermistor circuit detects the defrosting operation temperature.
  • Page 56 8. Reversing valve control circuit C-35V Power P.W.B. MAIN P.W.B. Reversing valve R701 D701 PQ701 Microcomputer CN4A CN4B Q701 R705 R706 DC voltmeter or multimeter D-0V Fig. 8-1 Reversing valve control circuit will switch reversing valve ON/OFF (cooling ON) according to instruction from indoor microcomputer depending on the operation condition shows in Table 8-1.
  • Page 57 9. Electric expansion valve control circuit POWER P.W.B. MAIN P.W.B. B-12V B-12V CN15 B-12V R403 R404 R401 Microcomputer PQ401 R293 Valve4 PQ402 R294 Valve3 Electric PQ403 R295 Valve2 expansion valve PQ404 R296 Valve1 CN4B CN4A 12 13 C401 B-0V Fig. 9-1 •...
  • Page 58 10. Outdoor DC Fan Motor control circuit This model uses DC Fan Motor which has a controller circuit built in the Motor. This DC Fan Motor will rotate by control voltage apply to Vsp input. (Voltage range: 1.7 to 7V DC. Vsp high : Faster ;...
  • Page 59 < Reference > When operation stop with LD301 blinks 12 times, it may be caused by faulty DC fan motor. In this case, please check CN6 and CN12 connection first. It makes Fan Motor Lock also if those connectors are in misconnection. DC Fan Motor has broken invites 1A Fuse burned.

  • Page 60: Service Call Q & A

    SERVICE CALL Q & A Model RAS-14EH1 / RAC-14EH1 COOLING MODE The compressor has Check if the indoor heat If the air conditioner operates stopped suddenly during exchanger is frosted. in cooling mode when it is cooling operation. Wait for 3-4 minutes cold, the evaporator may get until it is defrosted.
  • Page 61 AUTO FRESH DEFROSTING After the ON/OFF button is pressed Auto Fresh Defrosting is carried out : the system checks the outdoor heat exchanger to stop heating, the outdoor unit is and defrosts it as necessary before stopping still working with the OPERATION operation.
  • Page 62 When the “Sleep” timer is set during (1) The temperature arrives at the preset indoor operation, temperature and the air conditioner unit is (1) The indoor fan won’t rotate. temporarily stopped. Within about 3 minutes, (No air comes from the unit) the fan starts rotation.

  • Page 63: Trouble Shooting

    TROUBLE SHOOTING RAC-14EH1 PRECAUTIONS FOR CHECKING Power inlet WARNING Remember that voltage of 175 V is applied to the 0V line on the P.W.B. or the like as shown in the right diagram. Always keep your hands and metallic things away WARNING from the cabinet.
  • Page 64 DISCHARGE, PROCEDURE AND POWER SHUT OFF METHOD FOR POWER CIRCUIT WARNING Caution • Voltage of about 350 V is charged between the terminal of smoothing capacitors (400µF x 2). • During continuity check for each circuit part of the outdoor unit, be sure to discharge the smoothing capacitors.
  • Page 65 STRUCTURE OF AN INDOOR UNIT ELECTRIC PARTS RAS-14EH1 ELEC. COVER FIXTURE SCREW FIXTURE SCREW Removing electrical parts When installing the parts, use 1. Remove the electrical parts cover. caution not to pinch any code 2. Remove the connectors from the CN1 (heat exchange between the part and cabinet.
  • Page 66 Other Cautions (1) Cautions concerning ICP (IC Protector) 1. Use due caution for short circuit in servicing. Short circuit will open the ICP immediately. 2. When the ICP opens, remove the cause of this phenomenon and replace the ICP. If the remedy is improper, the ICP may open again. 35V line ICP2 Indoor unit fan motor...
  • Page 67 THE SUPPORT FUNCTION OF FAILURE DIAGNOSIS Function Name Description Self-diagnosis indication function • The “timer lamp” indicates a mode of failure detected <Indicating a failure on the indoor on the indoor or outdoor unit side by blinking unit side> frequency. •...
  • Page 68 TROUBLESHOOTING WHEN TIMER LAMP BLINKS. Model RAS-14EH1 Perform troubleshooting according to the number of times the indoor timer lamp and outdoor LD301 blink. SELF-DIAGNOSIS LIGHTING MODE Model: RAS-14EH1 Blinking of Timer lamp Reason for indication Possible cause Reversing valve defective...
  • Page 69 SELF-DIAGNOSIS LIGHTING MODE MODEL RAC-14EH1 INTELLIGENT POWER MODULE LD301 SELF DIAGNOSIS LAMPS LD302 SERVICE SWITCH LD303 – 67 –...
  • Page 70 OUTDOOR UNIT Remove the compressor connector. 1/ 2/ IPM (Intelligent Power Module) 3/ Service Switch 4/ Self-Diagnosis Lamp • Check the drive If your first attempt With the unit set in the operating circuit (IPM) using fails, wait 3 minutes state, press the start/stop the PRD checker.
  • Page 71 CHECKING THE INDOOR/OUTDOOR UNIT ELECTRICAL PARTS AND REFRIGERATING Trouble shoot according to the Is the indoor unit "timer lamp" blinking? self-diagnosis lighting mode. Open the indoor unit and check the voltage Run the unit using the following remote controller settings: between pins Nos.
  • Page 72 CHECKING THE INDOOR UNIT ELECTRICAL PARTS 1. Power does not come on (no operation) Is AC220-230V being generated Is AC220-230V being generated at Check AC outlet and breaker, and between terminals A and B on the AC outlet? repair any defective part. indoor unit terminal board? Check the power cable, power switch, and terminal board, and...
  • Page 73 2. Indoor fan does not operate (others are normal) Can the fan be stopped by remote The microcomputer fan PWM Replace the microcomputer. control? output (at pin N) is 1 - 5V. Replace the fan motor. Replace the microcomputer. Perform final operation check. 3.
  • Page 74 4. Check the control P.W.B. (power circuit) Is 35V or 20V being output Check to see if the connection cables are at pin 5 relative to 0V at disconnected or reversed. pin 3 of CN3? If normal, check the outdoor unit P.W.B. Is 12V or 7V being output Is ICP1 normal? at (+) relative to 0V at (-) of...
  • Page 75 CHECKING THE REMOTE CONTROLLER Is battery polarity correct? Install the battery in the correct polarity. Is the battery check sign + - Replace the battery. flashing? Turn on an AM radio, bring the remote control switch within 15 cm of the radio, and press the ON/OFF button.
  • Page 76 WARNING PRECAUTIONS FOR SERVICING Be sure that the power switch is turned off or the power cable is disconnected before servicing. Removing the P.W.B.s. System Configuration of Outdoor Unit Electrical Parts The outdoor unit electrical parts consist of two P.W.B. as shown in the figure. <Main P.W.B.
  • Page 77 [C. Power Factor Improvement capacitor] Designed to improve power factor. To replace the capacitor, remove the power P.W.B. and then: 1. Remove two screws fastening the capacitor seat. 2. Slide the capacitor seat in the direction of the arrow. Sliding Direction –...
  • Page 78 – 76 –...
  • Page 79 – 77 –...
  • Page 80 – 78 –...
  • Page 81 – 79 –...
  • Page 82 – 80 –...
  • Page 83 – 81 –...
  • Page 84 – 82 –...
  • Page 85 (JUDGING BETWEEN GAS LEAKAGE AND CHECKING THE REFRIGERATING CYCLE COMPRESSOR DEFECTIVE) 1. Troubleshooting procedure (No operation, No heating, No cooling) Lighting mode Blinks Blinks Blinks Blinks Blinks Blinks Connect U,V,W phase leads to the Self- 2 times 3 times 4 times 5 times 6 times 8times...
  • Page 86 HOW TO OPERATE USING THE SERVICE SWITCH THE OUTDOOR UNIT MODEL RAC-14EH1 1. Turn off the power switch. 2. Remove the electrical box cover. 3. Turn on the power switch. 4. After waiting for 30 seconds, push the service switch for a second. LD303 (red) will light and the unit will operate in the forced cooling mode at this time.
  • Page 87 IPM (Intelligent Power Module) DIAGNOSIS Circuit diagram of Collector the device RASF Emitter Circuit diagram of the module Terminals symbol mark of the module * See next page for measuring value using multimeter – 85 –...
  • Page 88 – 86 –...

  • Page 89: Procedure For Disassembly And Reassembly

    Procedure for Disassembly and Reassembly INDOOR UNIT RAS-14EH1 1. Front Panel 3. Control P.W.B. and Indicating (1)Pull up the washable panel by holding it at both P.W.B. lower sides with both hands. (1)Remove each connector from the lead wire. (2)Remove the four P.W.B. supports from the control P.W.B.
  • Page 90 4. Tangential air flow fan and fan motor OUTDOOR UNIT RAC-14EH1 (1)Remove two screws locking the drain pan. 1. Electrical parts (2)Press to lower the hook at the center of the (1)Remove the service value cover lock screws unit a little and pull the claw forward to remove and lower the cover to remove it.

  • Page 91: Parts List And Diagram

    PARTS LIST AND DIAGRAM INDOOR UNIT MODEL: RAS-14EH1 15 16 – 89 –...
  • Page 92 INDOOR UNIT PARTS NO. Q'TY PARTS NAME RAS-14EH1 CABINET RAS-10EH1 VERTICAL DEFLECTOR-L RAS-N28V VERTICAL DEFLECTOR-R RAS-N28V FAN MORTOR 25W 1.1kg RAS-N28V TANGENTIAL FAN RAS-N28V FAN SUPPORT ASSEMBLY RAS-N22V RAS-N28V FAN COVER FAN MORTOR SUPPORT RAS-N28V EVAPORATOR ASSEMBLY RAS-N40V2 UNION (2)
  • Page 93 OUTDOOR UNIT MODEL: RAC-14EH1 – 91 –...
  • Page 94 OUTDOOR UNIT PARTS NO. Q'TY PARTS NAME RAC-14EH1 RAC-14EH1 BASE RAC-14EH1 COMPRESSOR 750W 8.1kg RAC-N22V COMPRESSOR RUBBER RAC-E40V2 PUSH NUT RAC-14JH1 CONDENSER RAC-14EH1 REVERSING VALVE (WITH COIL) RAC-N28V SERVICE VALVE ASSEMBLY ELECTRIC EXPANSION VALVE ASSEMBLY RAC-14EH1 RAC-14EH1 SOUND PROOF COVER RAC-14EH1 O.L.R COVER RAC-N28V...
  • Page 95 HITACHI TC NO. 0774E RAS-14EH1/RAC-14EH1...

This manual is also suitable for:

Rac-14eh1

Table of Contents