Hitachi RAS-EH18RHLAE Service Manual
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Hitachi RAS-EH18RHLAE Service Manual

Room air conditioner indoor + outdoor unit
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Table of Contents

SERVICE MANUAL
TECHNICAL INFORMATION
I FOR SERVICE PERSONNEL ONLY I
SPECIFICATIONS
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
ROOM AIR CONDITIONER
RAS-EH18RHLAE
RAS-EH24RHLAE
RAC-EH18WHLAE
RAC-EH24WHLAE
INDOOR UNIT + OUTDOOR UNIT
APRIL 2021
I
I
NO. 0752E
PM
RAS-EH18RHLAE/RAC-EH18WHLAE
RAS-EH24RHLAE/RAC-EH24WHLAE
REFER TO THE FOUNDATION MANUAL
CONTENTS
SPEC I F l CATIONS ------------------------------------------------------ 5
HO W TO USE ---------------------------------------------------------9
CONSTRUCTION AND DIMENSIONAL DIAGRAM ---------42
MAIN PARTS COMPONENT -------------------------------------- 45
--------------------------------------------------- 4 7
CIRCUIT DIAGRAM -------------------------------------------------- 53
BLOC K D IAG RAM ----------------------------------------------------63
BASIC MODE ---------------------------------------------------------- 64
REFRIGERATING CYCLE DIAGRAM --------------------------- 75
AUTO S W ING FUNCTION --------------------- -------------------- 77
DESCRIPTION OF MAIN CIRCUIT OPERATION ----------- 88
& A ---------------- ---------------- -------------- 96
Q
SERVICE CALL
ASSEMBLY PROCEDURE --------------- 97
&
DISASSEMBLE
TROUBLE SHOOTING ------------ ------------ --------------------- 106
PARTS LIST AND DIAGRAM ------------ ----------- -------------- 1 35
� After installation

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Summary of Contents for Hitachi RAS-EH18RHLAE

  • Page 1: Table Of Contents

    NO. 0752E RAS-EH18RHLAE/RAC-EH18WHLAE RAS-EH24RHLAE/RAC-EH24WHLAE SERVICE MANUAL TECHNICAL INFORMATION REFER TO THE FOUNDATION MANUAL I FOR SERVICE PERSONNEL ONLY I CONTENTS RAS-EH18RHLAE SPEC I F l CATIONS ------------------------------------------------------ 5 HO W TO USE ---------------------------------------------------------9 CONSTRUCTION AND DIMENSIONAL DIAGRAM ---------42 MAIN PARTS COMPONENT -------------------------------------- 45...
  • Page 6 SPECIFICATIONS MODEL FAN MOTOR FAN MOTOR CAPACITOR FAN MOTOR PROTECTOR ATD141RDNA8JT ATD186UKQA9LT6A COMPRESSOR COMPRESSOR MOTOR CAPACITOR OVERLOAD PROTECTOR OVERHEAT PROTECTOR 2.0A FUSE (for MICROPROCESSOR) POWER RELAY POWER SWITCH TEMPORARY SWITCH SERVICE SWITCH TRANSFORMER VARISTOR NOISE SUPPRESSOR YES(IC) THERMOSTAT YES(IC) REMOTE CONTROL SWITCH (LIQUID CRYSTAL) ----- -----...
  • Page 7 INDOOR MODEL : RAS-EH18RHLAE...
  • Page 8 INDOOR MODEL : RAS-EH24RHLAE...
  • Page 9 OUTDOOR MODEL : RAC-EH18WHLAE, RAC-EH24WHLAE...
  • Page 10 Important Notice • Johnson Controls-Hitachi Air Conditioning North America LLC pursues a policy of continuing improvement in design and performance in its products. As such, Johnson Controls-Hitachi Air Conditioning North America LLC. reserves the right to make changes at any time without prior notice.
  • Page 11 SAFETY PRECAUTION • Please read the "Safety Precaution" carefully before operating the unit to ensure correct usage of the unit. • To prevent personal injury or property damage, read this section carefully before you use this product, and be sure to comply with the following safety precautions.
  • Page 12 PRECAUTIONS DURING OPERATION • The product shall be operated under the manufacturer specification and not for any other intended use. • Do not attempt to operate the unit with wet hands, this could cause fatal accident. • When operating the unit with burning equipments, regularly ventilate the &...
  • Page 13 Don't close drain outlet portion in chilly area so as not to freeze these. MODEL NAME AND DIMENSIONS WIDTH in(mm) HEIGHT in(mm) DEPTH in(mm) MODEL RAS-EH18RHLAE 30.70”(780) 9.05” (230) 11.07” (280) RAC-EH18WHLAE 33.46”(850) 25.59” (650) 11.73” (298)
  • Page 14 INDOOR UNIT INDICATORS MODEL RAS-EH18RHLAE OPERATION LED This LED lights during operation. The OPERATION LED flashes/dimming in the following cases during heating. (1) During preheating For about 2-3 minutes after starting up. (2) During defrosting Defrosting is performed about once every one hour when frost forms on the heat exchanger of the outdoor unit, for 5-10 minutes each time.
  • Page 15 NAMES AND FUNCTIONS OF EACH PART INDOOR UNIT Pre-fi lter To prevent dust from coming into the indoor unit. Front panel Indoor unit indicators LED light shows the operating mode. Horizontal deflector • Vertical deflector (Air Outlet) Remote controller Send out operation signal to the indoor unit. So as to operate the whole unit.
  • Page 16 MODEL RAS-EH24RHLAE INDOOR UNIT INDICATORS OPERATION LED This LED lights during operation. The OPERATION LED fl ashes/dimming in the following cases during heating. (1) 1) Duri preheating For about 2–3 minutes after starting up. (2) 2) Duri defrosting Defrosting is performed about once every one hour when frost forms on the heat exchanger of the outdoor unit, for 5–10 minutes each time.
  • Page 17 THE IDEAL WAYS OF OPERATION Suitable Room Temperature Install curtain or blinds Warning It is possible to reduce heat Freezing temperature entering the is bad for health and a room through waste of electric power. windows. Ventilation Effective Usage Of Timer At night, please use the "OFF or ON timer Caution or SLEEP timer operation mode", together...
  • Page 18 FOR USER'S INFORMATION The Air Conditioner And The Heat Source In The Room Caution If the amount of heat in the room is above the cooling capability of the air conditioner (for example: more people entering the room, using heating equipments and etc.), the preset room temperature cannot be achieved.
  • Page 19 AIRFLOW LOUVERS ADJUSTMENTS Adjustment of the conditioned air to the left and right. Hold the second vertical louver of each set of vertical louver from right as shown in the figure and adjust the conditioned air to the left or right. WARNING Do not insert a finger, a rod or other objects into the air outlet or inlet as the fan is rotating at a high speed, it will cause injury.
  • Page 20 ATTACHING THE AIR PURIFYING FILTERS (RAS-EH18RHLAE) CAUTION Before cleaning, stop operation and switch off the power supply. Open the front panel • Pull up the front panel by holding it at both sides with both hands. Remove the Pre-filter • Push upward to release the clasps and pull out the Pre-filter.
  • Page 21 ATTACHING THE AIR PURIFYING FILTERS (RAS-EH24RHLAE) Open the front panel Pull up the front panel by holding it at both ● sides with both hands. Remove the Pre- fi lter Push upward to release the clasps and pull ● out the Pre-fi lter. Attaching the air purifying fi...
  • Page 22 MAINTENANCE CAUTION I Before cleaning, stop operation and switch off the power supply. PRE-FILTER Clean the Pre-filter, as it removes dust inside the room. In case the Pre-filter is full of dust, the air flow will decrease and the cooling capacity will be reduced. Further, noise may occur. Be sure to clean the Pre-filter following the procedure below.
  • Page 23 CLEANING OF FRONT PANEL • Remove the front panel and wash with clean water. Wash it with a soft sponge. After using mild detergent, wash thoroughly with clean water. • When front panel is not removed, wipe it with a soft dry cloth.
  • Page 24 • CAUTION • Please use ground wiring. Do not place the ground wiring near water or gas pipes, lightning-conductor, or the ground wiring of telephone. Improper installation of ground wiring may cause electric shock. • A circuit breaker should be installed depending on the mounting site of the unit. Without a circuit breaker, the danger of electric shock exists.
  • Page 25 AFTER SALE SERVICE AND WARRANTY WHEN ASKING FOR SERVICE, CHECK THE FOLLOWING POINTS. CONDITION CHECK THE FOLLOWING POINTS If the remote controller is • Do the batteries need replacement? not transmitting a signal. • Is the polarity of the inserted batteries correct? Remote controller display is dim or blank.) •...
  • Page 26 Please note: On switching on the equipment, particularly when the room light is dimmed, a slight brightness fluctuation may occur. This is of no consequence. The conditions of the local Power Supply C ompanies are to be observed . Note •...
  • Page 27 PREPARATION BEFORE OPERATION When using the remote controller, if there is no response from the air conditioning unit and/or the display has faded and dimmed, the batteries in the remote control need to be removed and replaced with a new set. Push and pull to the direction of arrow ■...
  • Page 28 NAMES AND FUNCTIONS OF REMOTE CONTROLLER This remote controller controls the operation and timer setting of the room air conditioner. The operating range of the remote control from the indoor unit is 23feet (approx. 7m). If inverter lamp is used, the range may become shorter.
  • Page 29 Temperature Switching The default temperature display for this model is Fahrenheit ( F) . ° To switch the temperature display from Celsius to Fahrenheit T .:'.; Press and hold button for 3s . Release Reset button while pressing I T .:'.; I until Reset LCD shows Full Segment display.
  • Page 30 Multi Ty pe outdoor unit. Press the MODE selector button to select and display (AUTO) mode. ® HITACHI ,.,,., • When AUTO mode is selected, the room air conditioner automatically selects either HEAT or COOL mode depending on the current room temperature.
  • Page 31 To maintain the reliability of the room air conditioner, please operate when outdoor temperature is above ■ minimum operating range. Press the MODE selector button to select and display � (HEAT) mode. HITACHI Set the desired FAN SPEED using (FAN SPEED) button. The display indicates the setting. ;i:J °...
  • Page 32 If indoors humidity is very high (80%), some dew may form on the air outlet grille of the indoor unit. Press the MODE selector button to select and display ¢ (COOL) mode. HITACHI ,. , . - f Set the desired FAN SPEED using Fan,eed (FAN SPEED) button.
  • Page 33 ° ° Press the MODE selector button to select and display (DEHUMIDIFY) mode. HITACHI The fan speed is set at LOW..JO•F Set the desired FAN S P EED with the Fan , eed ( FA N S PEE D) butt o n .
  • Page 34 FAN OPERATION Use the unit as an air circulator. Press the M ODE selector button so that the display indicates (FAN ) . HITACHI • r � Press the Fan Speed (FAN SPEED ) button. {HIGH ) ---►� ( M ED ) �...
  • Page 35 (POWERFUL) button during HEATING, DEHUMIDIFYING, COOLING, FAN or AUTOMATIC operation, the air conditioner operates at maximum power. ■ During POWERFUL operation, cooler or warmer air flow will be blown out from the indoor unit for COOLING or HEATING operation respectively. HITACHI ,.,.-. I � I �...
  • Page 36 ~ 60 F (10 ~ 16 ° ° ° ° ° ° HITACHI Leave Home Press the (LEAVE HOME) button to activate the ,i:j, function. Room temperature is set at 50 F (10 C) and HEATI N G operation �!..l °...
  • Page 37 CLEAN {ONE TOUCH CLEAN) OPERATION (For Multi-model connection) Use this function to dry the heat exchanger of the indoor unit to prevent formation of mildew. HITACHI F.W/CL • Press the � (FROST WASH/CLEAN) button when unit is in Standby mode.
  • Page 38 � I F.W/CL When the unit is off, press (FROST WASH/CLEAN) button, manual Frost Wash will start. ■ How to start and cancel Frost Wash (Manual mode) HITACHI I � I F.W/CL " • Press (FROST WASH/CLEAN) button, " [ is displayed �[j...
  • Page 39 ECO operation is an energy saving function by changing set temperature automatically and limiting the maximum power consumption value. By pressing the (ECO) button during HEATING, HITACHI -,. - . AUTO, DEHUMIDIFYING or COOLING operation, the unit performs ECO operation .
  • Page 40 Silent I � I • When button is pressed, HITACHI ,.,,.. • " b&J "will be displayed on the LCD. • Fan speed will be in silent c:-_;) . �...
  • Page 41 Mode Indication hour-+ 2 hours-+ 3 hours -+ 7 hours Sleep timer HITACHI Sleep timer off ,. " f � � During Sleep Timer, the unit will continue working for the ¢...
  • Page 42 ADJUSTING THE AIRFLOW DIRECTION Adjust the airflow upward and downward HITACHI The horizontal air deflector is automatically set to the specific angle that is suitable for each operation. The deflector can swing up and down and set to UP/Down ,.,,.f desired angle by pressing (UP/DOWN) button.
  • Page 43 MODEL RAS-EH18PHLAE Unit: Inch (mm) 3-15/16” (100) 3-15/16” (100) 30-45/64” (780) 1-57/64” (48) 1-27/32” (47) 7-1/64” (178) 17-13/32” (442) 6-19/64” (160) 3-39/64” 3-39/64” (91.5) (91.5) About 3-1/32” (77) About 13-61/64” (354.5) About 2-43/64” (68) 33/64” (13) 1-15/32” (37.5) 2-7/8” (73) 3-55/64”...
  • Page 44 MODEL RAS-EH24PHLAE Unit: Inch (mm) '43.30"(1100) 10.24"(260) \•/ ......1.85"(47) 1.85"(47) 2.36"(60) 2.36"(60) 3.66"(93) 21.65"(550) 21.65"(550) 4.84"(123)
  • Page 45 Unit: Inch (mm) MODEL : RAC-EH18WHLAE / RAC-EH24WHLAE Handle Handle Handle Service Air Outlet Valve Air suction Qrill Holes for anchor bolt 2-012 Notch for anchor b olt 2-012 Fixing Hole More than More than 3.94"(100) 7.84"(200) Service space - 44 -...

  • Page 46: Main Parts Component

    16.0 (60.8) ° TEMPERATURE 24.7 (76.5) INDICATION 24.0 (75.2) 32.7 (90.9) INDICATION 32.0 (89.6) FAN MOTOR Fan Motor Specifications MODEL RAC-EH18WHLAE RAS-EH18RHLAE RAS-EH24RHLAE RAC-EH24WHLAE RATED VOLTAGE DC120 - 380V DC340V DC340V OUTPUT 47 W 38 W 38 W DC263~400V DC263~400V CONNECTION DC13.5~16.5V...
  • Page 47 COMPRESSOR MOTOR Com p ressor Motor S p ecifications RAC-EH18WHLAE RAC-EH24WHLAE MODEL ATD186UKQA9LT6A COMPRESSOR MODEL ATD141RDNA8JT PHASE SINGLE RATED VOLTAGE AC 220V - 240V RATED FREQUENCY 50/60 Hz POLE NUMBER 4 pole 6 Pole CONNECTION YELLOW ° 2M = 1.310 ±7% 2M = 1.354 ±7% °...

  • Page 48: W Iringdiagram

    WIRING DIAGRAM MODEL RAC-EH18WHLAE MODEL RAS-EH18RHLAE INDOOR UNIT OUTDOOR UNIT BROWN WHITE BLUE YELLOW GRAY ORANGE GREEN BLACK PINK VIOLET IVORY OUTDOOR [WI RI NG DI AGRAM] ,----------- CN2� FAN MOTOR DR I VE c rncu1 � � D R I vE Rcu n :��...
  • Page 49 WIRING DIAGRAM MODEL RAC-EH24WHLAE MODEL RAS-EH24RHLAE INDOOR UNIT OUTDOOR UNIT BLUE YELLOW BROWN WHITE GRAY ORANGE GREEN BLACK PINK VIOLET IVORY OUTDOOR [WI RI NG DI AGRAM] ,----------- CN2� FAN MOTOR VE c rncu1 � � D R I vE Rcu n DR I :��...

  • Page 50: Circuit Diagram

    CIRCUIT DIAGRAM Remote Controller � ----=-=- ��������� ��� :::�O\OOr-..\01.t")'q"MN.- V'IV'IV'IV'IV'IV'IV'IV'IV'IV'IV'I � LCD1 HT69F VMN.-00\00r--.\OL.f".IVM NNNNN.-.-.- " SEG12 COMO � " SEG11 COM1 SEG10 , i;J]ttf 1 SEGO COM2 PE2/SEG10 PF7/SEG23 " SEG9 R1,R2, R3,R4 7'J,fJ1.�jil;� '\. t)J:@'2 COM3 / COM3 PE1/SEG9 COM3/SEG24 �...
  • Page 51 CIRCUIT DIAGRAM NOTES: MODEL RAS-EH18RHLAE MOUNTING FACE TYPE OF CAPACITOR A- COMPONENT SIDE F- FILM CAPACITOR 8-SOLDER SIDE C- CERAMIC CAPACITOR D- ELETROL YTIC CAPACITOR PCB DETAILS:- MOUNTING TYPE A-AXIAL RESISTOR RESISTOR BOARD TYPE DRAWING FORM �:« :: CAPACITOR DIODE R- RADIAL -;;;...
  • Page 52 CIRCUIT DIAGRAM RESISTOR RESISTOR CAPACITOR DIODE VALUE ASSY. SYMBOL VALUE TOLERANCE WATT FORM GROUP REMARK ASSY SYMBOL TOLERANCE WATT FORM GROUP REMARK (˜) (˜) MODEL RAS-EH24RHLAE VALUE FORM GROUP ASSY R001 R651 1/16 1005 ASSY SYMBOL MODEL A , B SYMBOL VOLTAGE TYPE FORM GROUP REMARK...
  • Page 53 �Mbd CIRCUIT DIAGRAM HIC-PCBA MODEL: RAC-EH18WHLAE, RAC-EH24WHLAE MAIN-PCBA ·� loio'OIIC■Fi.:: t rl:�· ,,. �. , S)'ril� l,loc� �- p o ,. lolerc-r::< [o�i: �■:r R!Oi,tanc, !,,PC Canacitor Resistor Canacitor Transistor Resistor R001 1.43M 1 /; C001 AC3CO "' ' 0286 DTC1 I 4EEETL R200 10<...

  • Page 54: Printed W Iring Board Location Diagram

    PRINTED BOARD LOCATION DIAGRAM MODEL: RAS-EH18RHLAE MAIN P.W.B Marking on P.W.B RECEIVING P.W.B SENSOR P.W.B Marking on P.W.B Marking on P.W.B - 59 -...
  • Page 55 PRINTED BOARD LOCATION DIAGRAM MODEL: RAS-EH24RHLAE MAIN P.W.B Marking on P.W.B RECEIVING P.W.B SENSOR P.W.8 Marking on P.W.B Marking on P.W.B ..:!L la Cl!l'5l IMI -60-...
  • Page 56 MAIN PWB MODEL RAC-EH18WHLAE RAC-EH24WHLAE Bottom side Top side - 61 -...
  • Page 57 HIC PWB Top side Bottom side - 62 -...
  • Page 58 Frost Wash Humidity...

  • Page 59: Basic Mode

    □ ■ ■ ■ ■ ■ □ ■ BASIC MODE Cooling Dehumidifying Heating Auto Basic operation of start/stop button Start Stop Start Stop ■ s : r11stop button 0 eration lamp - - - - - - - Startlsto button • Reserve button ancel hutton Ooeration lam...
  • Page 60 Basic Cooling Operation Room temperature Fan s eed set to "auto" Stop Start StarVstop switch Thermo judgment Thermo OFF Silent Ultra-Lo Operation lamp 1min. Max. Rating 3000 Min. Outdoor fan Reversing valve (heating "on" mode) Notes: (1) Condition for entering into Cool Dashed mode. When fan set to "Hi" or "Auto and when the compressor speed (P section) due to temperature difference between setting temperature (including the correction shift only) and room temperature is CMAX or higher.
  • Page 61 Cooling Powerful Operation Cooling Defrost "POWERFUL" setting Cool i t i o Temperature setting �M; �dw ; �=S = -=- :. -=-;.-=-;.-=-;.-=-;.-=-;.-=-;.-=-;.-=-;.-=-; t';:':_� _ = s _ = · ��;:_-:=_-:=_ -:=_-:=_-:=_-:=__-=. : -=- : -=- : -=- : ·:::_-;: t-- ---- � --+----- -=-: -=-: �:...
  • Page 62 Dehumidifying 30sec. Room temperature ·ud ement Room temperature C") Cooling preset temperaure 1---+--+---+---�---------------------- --.-: ,,..- ====- --------+-------jl------------ ----, .L--+------- () () (<:! c.o Start Start/Stop Switch Operation lamp Thermostat judgement Indoor fan Lo/Silent 15 sec. 1 sec. I- L � t�CJiiiiiiiliiiiii■ii�======��=============================1■iiiiiiiiii■ii�====�====·••iiiiiiiE�===�==·••iiiiiiiiiiliii■il�::: Outdoor fan Reversing valve 1 min.
  • Page 63 Dehumidifying Powerful Operation "POWERFUL" setting Temperature setting PWSFTSD "'C SDMAX Notes: (1) Pressing the "POWERFUL" button will reduce the temperature setting by PWSFTSD. (2) The powerful operation is for 20 minutes after setting. (3) Operation is continued forcibly thermo-ON for 20 minutes after the powerful operation is finished. (4) Pressing the "START/STOP"...
  • Page 64 ECO button ° ° Cooling:1.00 C Dehumidifying:1.00 Set temperature Current restrict Compressor speed Notes: • Can't set POWERFUL and ECO at the same time. • During FAN operation,can't set ECO. - 73 -...
  • Page 65 Clean Operation CLEAN operation period 60' CLEAN button Operation mode Operation lamp Indoor fan Outdoor fan Compressor speed Notes: (1) During CLEAN operation period, heating mode will change to fan mode when HEX temparature is "CLNEVP" or more except force 3 minutes operation. (2) For multi connections, CLEAN operation is limited to fan mode.
  • Page 66 MODEL : RAS-EH18RHLAE / RAC-EH18WHLAE 4S-VALVE Ø12.7mm(1/2") THERMISTOR 2S-VALVE Ø6.35mm (1/4") 4S-VALVE Ø12.7mm(1/2") THERMISTOR 2S-VALVE Ø6.35mm (1/4") - 75 -...
  • Page 67 MODEL : RAS-EH24RHLAE / RAC-EH24WHLAE THERMISTOR 5S-VALVE Ø15.88mm(5/8") THERMISTOR 2S-VALVE Ø6.35mm (1/4") THERMISTOR 5S-VALVE Ø15.88mm(5/8") THERMISTOR 2S-VALVE Ø6.35mm (1/4") - 76 -...

  • Page 68: Auto Swing Function

    AUTO SWING FUNCTION PRESENT CONDITION OPERATING SPECIFICATION REFERENCE INPUT SIGNAL OPERATION OPERATION MODE AIR DEFLECTOR ONE SWING (CLOSING AIR DEFLECTOR) INITIALIZE AT NEXT (D DOWNWARD STOP OPERATION. EACH MODE STOP @ UPWARD KEY INPUT DURING ONE SWING STOP AT THE MOMENT. START SWINGING DOWNWARD DURING...
  • Page 69 . Control power circuit LOOI � 8.5V FUI 3.15A fuse § § S',! § Switching power circuit Fig. 1 -1 • An AC power supply from indoor unit passes through the 3. 1 5A fuse, varistor (VA001 ), and noise filter circuit and rectified and smoothed by DB1 and C003 to become a DC current 3 25 V.
  • Page 70 2. Reset Circuit Microcomputer (612 Fig. 3-1 Timing chart Voltage ------------1 � - s _ . o_ v _�� @ pin of IC501 supply voltage RES canceling voltage 4.4V Voltage " __.l - -+----------..; pin of IC501 output voltage �-s . _ o v _ or @ pin of microcomputer Fig.
  • Page 71 3. Drive circuit ofthe indoor fan motor Primary 18.SV � --- R201 "' '" � Primary0V -----------------+-!--_____ ____,.., Rotation speed feedback signal (to pin © of microcomputer) -!-- -- ..- - Output signal of indoor fan (to pin @of microcomputer) ----'\"t'v---+----+� R213 Fig.
  • Page 72 4. Buzzer Circuit Microcomputer Buzzer output Fig.4 - 1 Buzzer Circuit • When the buzzer sounds, an approx. 3.9kHz square sigl).8.l is output from buzzer output pin ®of the micro computer. After the amplitude of this signal has b een set to 12Vp- P by a Piezoelectric element Metal diaphragm transistor, it is applied to the buzzer.
  • Page 73 6. Room temperature, heat exchanger thermistor circuits Microcomputer lnidcation P.W.B MAIN P.W.B CN16A CN16 Heat exchanger thermistor input Room temperature 90 , ___ -+---w..,__.o----+-f--1 thermistor input • The thermistor is used for detecting the room temperature and indoor unit heat exchanger pipe temperature. •...
  • Page 74 8. Initial Setting Circuit (1(531) • When power is supplied, the microcomputer reads the data in 1(531 (E PROM) and sets the preheating activation value and the rating and maximum speed of the compressor, etc. to their initial values. • Data of self-diagnosis mode is stored in 1(531; data will not be erased even when power is turned off. Microcomputer Fig.
  • Page 75 "' t-+--+---++-+--+--+---<-+--+---t 0 f-<f+----l--+!+-+-,o+.1f-+----,t-+---+<l-l :':, f-<ttttltt>---fftlt-ttttlflfff--+-IIIH--ttt ;'.; 1-+++--+---++-t--<l+-l'-+--+-+-+-++---l OY �IIIII-III--IIIII-IIIIIIIIN---1--11111--111- 10. Indoor/outdoor communication circuits Indoor unit side Outdoor unit side Inverter circuit Outdoor C302 T microcomputer 'jlOV Indoor transmission circuit Indoor microcomputer {IC601} Outdoor reception input Indoor transmission output Indoor reception input Indoor unit reception circuit Fig.10-1 T he unit is receiving a signal that it sent...
  • Page 76 Check I If a cable poorly inserted in the indoor terminal board or some other failure overheats the terminal board and the temperature fuse of the terminal board blows out, the power to the indoor communication circuit will be shut down to stop the communications function.
  • Page 77 11. Stepping motor drive circuit Microcomputer Vertical air flow L-�4 Vertical air flow L-�3 Vertical air flow L-�2 Vertical air flow L-�1 CN12 Horizontal air flow R-�4 Horizontal air flow R-�3 Horizontal air flow R-�2 Horizontal airflow R-�1 Fig. 11-1 [Connector circuit waveform while the motor runs] Voltage waveforms of different phases as viewed from the OV line while the motor rotor is turning counterclockwise...
  • Page 78 12. Run status and alarm signal output circuit ICN51 848-XH-A Microcomputer R511 R800 OPERATION LAMP 2 9 OPERATION OUTPUT Fig.12-1 Fig.12-1 is the control circuit of run status and signal output in main PWB.The pin@ of CNS is used to show run status and the pin @ of CNS is used to warn people when failure occurrence. If customer want to use this function, need to use the adapter(sold separately) to achieve it.
  • Page 79 MODEL: RAC-EH18WHLAE,RAC-EH24WHLAE 1. Power Circuit. リアクタ ５．３ｍＨ WＨ１２−１ WＨ１２−２ WＨ７ MAIN BOARD ＷＨ６ ＷＨ１０２ ＷＨ１０１ WＨ８ ＷＨ−Ｅ−５ WＨ９ ＷＨ−Ｅ−６ Ｑ６０１ WＨ10 ＷＨ−Ｅ−７ Ｄ６０３ Ｄ６０１ ＷＨ−Ｅ−８ COMPRESSOR MOTOR ＴＨ００１ Ｑ９０１ Ｑ９０２ Ｑ９０３ ＮＦ１ ＪＷ６０１ ＷＨ１１ Ｆ１ Ｕ Ｑ６０２ ＲＬ４ Ｄ６０４ Ｄ６０２ Ｖ...
  • Page 80 2. Power Circuit (Low Voltage) l',1AIN BOARQ BRN'.,,, -�t /� :'; 1'i I i i 7tll � ,� ... -L I ii� < 1111 - - - +=-+-�-----+--c; , � .� -� :,:1111 rr--- , j ; • ;�i: . _-;- �...
  • Page 81 MODEL RAC-EH18WHLAE,RAC-EH24WHLAE 0904, 0905, 0906 0901, 0902, 0903 5P-TERM I NAL DB602 0602 Smoothing Capacitor (G021. G022) *Because hi gh voltage flows, be careful about electri c shock. Also.be careful about short-ci rcui t accidents by i mproper connecti on of measuri ng i nstruments, whi ch can damage the board. Power Supply Ci rcui t for Board The voltage speci fi cati on of the power supply ci rcui t are as fol low.
  • Page 82 Temperature Detection Circuit HIC P.W.B OH therm i star R203 Micro C202 Computer Fig_ 4-1 • OH thermistor circuit detect the temperature at the surface of compressor head, DEF thermistor circuit detect the defrosting operation temperature. • A thermistor is a negative resistor element which has characteristics that the higher(lower) the temperature, the lower(higher) the resistance.
  • Page 83 5. Outdoor DC fan motor control circuit • This model is bui It with DC fan motor control circuit inside outdoor electrical unit. Outdoor EI ectr i ca I I ---------------------------7 Smoo th i ng c a pa 2A Fuse DC300 �...
  • Page 86 7.Reversing valve control circuit. This model reversing valve control used to control the relay ON/OFF of the reversing valve, and also control the coil of the reversing valve ON/OFF. The relay ON/OFF has different type when in the different operation mode. You can see each operation mode as follows.

  • Page 88: Assembly Procedure

    5) Release the claws on the top (3 places) and pull the lower side of the frontcover towards you to remove it. Disassembly and assembly procedure. MODEL: RAS-EH18RHLAE 1. Front panel ! Caution at the time of assembly 3. Indoor Electrical 2.
  • Page 92 Procedure for Disassemble and Reassemble MODEL : RAS-EH24RHLAE 1. Front Panel 3. Main P.W.B and Reception/Indication P.W.B (1) Remove each connector from the lead wire. (1) Pull the panel by holding it both lower sides with both hands. (2) Remove the two P.W.B supports from the main P.W.B.
  • Page 93 (4) Remove the two lock screws from the fan motor holder and one screw from the evaporator support plate. (5) Pull up the evaporator by holding it at the lower side. Insert a screwdriver through the space between the evaporator and fan motor holder and loosen the fan lock screws to remove the air fow fan and fan motor.
  • Page 94 CN12 CN18 CN16A CN12 CN17 CN16A - 103 -...
  • Page 95 Procedure for Disassembly and Reassembly OUTDOOR UNIT MODEL RAC-EH18WHLAE,RAC-EH24WHLAE 2. Dismantle procedure of MAIN PWB. (1) Remove terminal cover. 1. Electrical Parts (1) Remove the top cover fixing screws Terminal Cover and lift the cover to remove it. (2) Remove the handle cover fixing screws and push it down to take it out.
  • Page 96 (4) Remove each connector and earth cable from the lead wire.Then,remove the electrical box. Fig.13 3. The PWB. (1) Remove the electrical cover. detents Fig.14 (2) Remove the PWB from the support. detents detents Fig.15 - 105 -...

  • Page 97: Trouble Shooting

    TROUBLE SHOOTING Inspection instructions r fan m r Electrical Outd r Electrical & Warning wer supply 1<D 115/230V 60Hz Note that the O V line of the outdoor electrical parts and 1 � � l circuit the primary power circuit of l circuit �I I _________ �...
  • Page 98 Troubleshooting support Function Description Self-diagnosis display • The failure mode detected on the indoor unit side is displayed by [Display on the indoor blinking the "timer lamp". And a failure detected on the outdoor unit side] unit side will be indicated by the "timer lamp" blinking 4 times. •...
  • Page 102 MODEL RAC-EH18WHLAE,RAC-EH24WHLAE LED(*1) INDICATION LED INDICATION DURING STOP Lh & DURING COMPRESSOR OPERATE sELF-DIAGNOSE DANGER (ABOUT DC350V) LD301 1 CHECKING POINT AND REPAIR METHOD OPERATION CONTENT LD301 CUT THE POWER SOURCE AND WA I T MORE THAN STATUS NO POWER SUPPLY AT TERMINAL "L - N" -+ CHECK POWER CABLE 10 MINUTES BEFORE SERVICING WORK.
  • Page 103 (JUDGING BETWEEN GAS LEAKAGE AND lcHECKING THE REFRIGERATING cvcLE I COMPRESSOR DEFECTIVE) 1. Troubleshooting procedure (No operation, No cooling) Connect U,V,W phase leads to the Blinks Blinks Blinks Blinks Blinks power module again and operate the � 2 times 3times 4 times Slimes 6 times air conditioner.
  • Page 104 Self Diagnosis Memory Function Failure mode are stored in the non-volatile memory of indoor unit and can be redisplay by operating the remote controller. This function is very useful in checking the failure modes when either unintentionally switching OFF power supply or restarting the unit operation without conforming the number of blinking of self diagnosis lamp.
  • Page 105 1. While pressing and holding (ON/OFF) butt on and button, press [RESET ] button on the same. Release [RESE T] button only and make sure that all marks on the remote controller display are indicated then release the (ON/OFF) butt on and button.
  • Page 106 SETTING THE PREVENTION OF MUTUAL INTERFERENCE FOR REMOTE CONTROLLER a.) Other indoor circuit breakers should be disconnected. b.) Remove the back cover of the remote control. c.) Cut the jumper as shown below. d.) Press “Reset” button after installing the battery. e.) Corresponding to the room electrical box dial code 6 to dial on.
  • Page 107 HOW TO CHANGE THE FAN SPEED IN COOLING MODE DURING THERMO OFF The fan speed in Cooling Mode during thermo off can be changed by the remote controller. (This procedure shall be implemented strictly by service personnel only.) It is possible to return it to the default setting. PROCED U R E Press [POWERFUL] button and...
  • Page 108 HOW TO CHANGE THE INTERMITTENT FAN HEATING SETTING The intermitt ent fan control during thermo o˜ in Heating mode can be changed by the remote controller. (The procedure should be done only by service personnel.) It is possible to select from 3 patt erns. PR OCED URE Press (POWERFUL) button,...
  • Page 109 DISPLAY OPERATION MODE SETTING For operating indoor unit independently (without outdoor unit connection), remote controller must be set according to below procedures before send the signal to the indoor unit. New communication format between indoor and outdoor is required to communicate with outdoor unit.
  • Page 110 Diagnosis and troubleshooting of indoor electric parts, outdoor electric parts and refrigerating cycle Initiating troubleshooting '-------> Are the "timer lamp" (orange) of the indoor unit Perform troubleshooting according to the blinking? self-diagnosis display. The product will begin to run in response to a remote ._______>...
  • Page 111 Checking the indoor unit electrical parts Introduction First check the failure phenomenon and status, and then move on to elaborate diagnosis. Initiating troubleshooting '-------> How many times does the time lamp Is the "timer lamp" (orange) of the indoor unit blinking? blinking ..., Check indoor timer...
  • Page 128 How to run the product with the outdoor unit test switch If the indoor electrical parts is out of order and if you wish to run the outdoor unit. 1. Turn OFF main power supply. 2. Connect the Test Switch jig connector to CN18. 3.
  • Page 129 Self-check If you cannot judge if it is an abnormality on the electrical part or the compressor by the "Bl inking twice, 3 times,4 times or 5 times" of the self-diagnosis indicator, perform the megger check to check the isolation of the compressor has no problems, perform the fol lowing [self-check]. (The inverter should be checked).
  • Page 130 3&€cautlons 1. Before making the connecdons, be sure 1D turn off the breaker. 2. Do not under any circumstances run the product for more than 5 minutes. cause 3 . Doing work with the compressor connedor removad wlll the LD3011D bllnk 411mes. It wlll not start 4.
  • Page 131 MODEL : RAS-EH18RHLAE - 135 -...
  • Page 132 MODEL RAS-EH18RHLAE N O . PART N O . Q'TY UNIT PARTS NAME PMS-EH18RHLAE P.W.B (MAIN) (RAS-EH18RHLAE) P.W.B (RECEIVER) PMS-EH09PHLAB PMS-EH1 8RHLAE CYCLE ASSY PMS-EH09RHLAE FAN MOTOR PMS-EH09PHLAB FRONT COVER ASSY PMRAS-EH1 0CKT FRONT PANEL PMS-EH09PHLAB AIR FILTER PMRAS-S18CPA AUTO SWEEP MOTOR...

  • Page 133: Parts List And Diagram

    PARTS LIST AND DIAGRAM INDOOR MODEL· UR��-EH24RHLAE _ 137 -...
  • Page 134 MODEL RAS-EH24RHLAE PART NO. Q'TY / UNIT PARTS NAME PMRAS-VX13CET REMOTE CON TROL SUPPORT PMRAK-50PPD TERMIN AL BOARD (3P) P.W.B (MAIN) PMS-EH24RHLAE PMS-EH24RHLAE DRAIN PAN ASSY PMS-SH18RHLAE FILTER PMRAS-10C8M THERMISTOR SUPPORT PMRAS-S50YHAB PWB RECEIVER PMRAS-70YHA4 CABINET PMRAS-70YHA4 PMRAS-70YHA4 CYCLE ASSY PMRAS-70YHA4 PIPE SUPPORT PMRAS-70YHA4...
  • Page 135 PARTS LIST AND DIAGRAM OUTDOOR UNIT MODEL. · RAC-EH18WHLAE, RAC-EH24WHLAE ,,,/ -_,,, / _ 117 -...
  • Page 136 MODEL RAC-EH18WHLAE PART NO. Q'TY UNIT PARTS NAME KPNT1 PUSH NUT PMC-EH09WHLAB TERMINAL BOARD(5P) PMC-EH09WHLAB THERMISTOR (OUTSIDE TEMPERATURE) PMC-EH09WHLAB THERMISTOR (DEFROST) PMC-EH18WHLAE SIDE PLATE (R) PMC-EH18WHLAE SV-COVER-B PMC-EH18WHLAE SV-C0VER-T PMC-EH18WHLAE TOP COVER PMC-EH18WHLAE COMPRESSOR PMRAC-25NPA ELECTRICAL EXPANSION COIL PMRAC-25NPA EXPANSION VALVE PMC-EH18WHLAE P.W.B MAIN PMRAC-50NH4...
  • Page 137 MODEL RAC-EH24WHLAE PART NO. Q'TY UNIT PARTS NAME KPNT1 PUSH NUT PMC-EH09WHLAB TERMINAL BOARD(5P) PMC-EH09WHLAB THERMISTOR (OUTSIDE TEMPERATURE) PMC-EH09WHLAB THERMISTOR (DEFROST) PMC-EH18WHLAE SIDE PLATE (R) PMC-EH18WHLAE SV-COVER-B PMC-EH18WHLAE SV-C0VER-T PMC-EH18WHLAE TOP COVER PMC-EH24WHLAE COMPRESSOR PMRAC-25NPA ELECTRICAL EXPANSION COIL PMRAC-25NPA EXPANSION VALVE PMC-EH24WHLAE P.W.B MAIN PMRAC-50NH4...
  • Page 138 HITACHI RAS-EH18RHLAE / RAC-EH18WHLAE PM NO. 0752E RAS-EH24RHLAE / RAC-EH24WHLAE Printed in Malaysia LIT 12013820 © 2021 Johnson Controls-Hitachi Air Conditioning, Inc.

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