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Hitachi airHome 300 CH Series Service Manual
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Hitachi airHome 300 CH Series Service Manual

Indoor/outdoor unit
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SERVICE MANUAL
CH SERIES
RAK-CH18PCASV/RAC-CH18PCASV
RAK-CH24PCASV/RAC-CH24PCASV
CONTENTS
SPECIFICATIONS
HOW TO USE
CONSTRUCTION AND DIMENSIONAL DIAGRAM
MAIN PARTS COMPONENT
WIRING DIAGRAM
CIRCUIT DIAGRAM
PRINTED WIRING BOARD LOCATION DIAGRAM
BLOCK DIAGRAM
BASIC MODE
REFRIGERATING CYCLE DIAGRAM
DESCRIPTION OF MAIN CIRCUIT OPERATION
SERVICE CALL Q & A
AUTO SWING FUNCTION
PARTS LIST AND DIAGRAM
Instruction manual
To obtain the best performance, please read this instruction manual completely.
คู ่ ม ื อ การใช ้ ง าน
เพื อได ้รั บ การทํ า งานที ดี ท ี สุ ด โปรดอ่ า นคู ่ ม ื อ อย่ า งละเอี ย ด
<PM NO:0825E>
INDOOR UNIT
RAK-CJ18PCAST
RAK-CH18PCASV
RAK-CJ24PCAST
RAK-CH24PCASV
OUTDOOR UNIT
Page 9
Page 12
Page 33
Page 36
Page 39
Page 41
Page 49
Page 53
Page 54
Page 59
Page 62
Page 78
Page 109
Page 113
RAC-CH18PCASV
RAC-CH24PCASV
Page 1~26
หน ้า 27~54

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Summary of Contents for Hitachi airHome 300 CH Series

  • Page 1 SERVICE MANUAL INDOOR UNIT RAK-CJ18PCAST RAK-CH18PCASV RAK-CJ24PCAST RAK-CH24PCASV CH SERIES OUTDOOR UNIT RAK-CH18PCASV/RAC-CH18PCASV RAK-CH24PCASV/RAC-CH24PCASV CONTENTS SPECIFICATIONS Page 9 HOW TO USE Page 12 CONSTRUCTION AND DIMENSIONAL DIAGRAM Page 33 RAC-CH18PCASV MAIN PARTS COMPONENT Page 36 WIRING DIAGRAM Page 39 CIRCUIT DIAGRAM Page 41 PRINTED WIRING BOARD LOCATION DIAGRAM Page 49...
  • Page 2 SAFETY DURING REPAIR WORK 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.
  • Page 3 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 manufacturers during maintenance and handling thereof. (They apply the same to handling of abnormal goods such as rejected goods being returned). 2.
  • Page 4 (6) Use a three wire type soldering iron including a grounding wire. Metal plate (of aluminium, stainless steel, etc.) Bare copper wire (for body earth) Working table Resistor 1 M (1/2W) Staple Earth wire Fig. 3. Grounding of the working table Soldering iron Grounding wire Screw stop at the screwed...
  • Page 5 CAUTION Slight fl owing noise of refrigerant in the refrigerating cycle is expected to be heard occasionally in quiet or stop operation and it is normal. 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.
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  • Page 9 SPECIFICATIONS (WALL TYPE) TYPE INDOOR UNIT OUTDOOR UNIT INDOOR UNIT OUTDOOR UNIT RAC-CH18PCASV MODEL RAK-CH18PCASV RAC-CH24PCASV RAK-CH24PCASV POWER SOURCE 1 PHASE, 50 Hz, 220 -240V 1,800 (350-2,000) TOTAL INPUT 1,500 (350-1,800) TOTAL AMPERES 7.18 -6.58 8.61 - 7.89 6.2 (1.5 - 6.8) (kW) 5.2 (0.9 - 5.5) CAPACITY...
  • Page 10 Direction of Piping Figure showing the Installation of Indoor and Outdoor Unit. CAUTION In case the pipe length is more than the recommended length for chargeless, add refrigerant R32 as below. Do not exceed the maximum pipe length. There are 6 directions allowed, namely, horizontally Factory Indoor...
  • Page 11 Direction of Piping Figure showing the Installation of Indoor and Outdoor Unit. CAUTION In case the pipe length is more than the recommended length for chargeless, add refrigerant R32 as below. Do not exceed the maximum pipe length. There are 6 directions allowed, namely, horizontally perpendicular to the unit, Factory...
  • Page 12 SAFETY PRECAUTION Please read the “Safety Precaution” carefully before operating the unit to ensure correct usage of the unit. ● Pay special attention to signs of “ Warning” and “ Caution”. The “Warning” section contains matters which, if not ● observed strictly, may cause death or serious injury.
  • Page 13 PRECAUTIONS DURING OPERATION The product shall be operated under the manufacturer specifi cation and ● not for any other intended use. Do not attempt to operate the unit with wet hands, this could cause fatal ● accident. During thunder storm, disconnect and turn off the circuit breaker. ●...
  • Page 14 NAMES AND FUNCTIONS OF EACH PART INDOOR UNIT Pre-fi lter To prevent dust from coming into the indoor unit. (Refer page 30) Front panel Indoor unit indicators Light indicator showing the operating condition. (Refer page 15) Horizontal defl ector Vertical defl ector ●...
  • Page 15 INDOOR UNIT INDICATORS FROST WASH LAMP This lamp lights when the Frost Wash function is in operation. This lamp blinks to suggest operating manual FROST WASH operation after 200 hours of air conditioner cumulative usage. Please refer to remote controller manual for the details of Frost Wash operation.
  • Page 16 NAMES AND FUNCTIONS OF REMOTE CONTROL UNIT REMOTE CONTROLLER This controls the operation of the indoor unit. Signal range to reach indoor unit is about 7 meters. If inverter lamp is used, the range of control may be shorter. This unit can be fi xed on a wall using the fi xture provided. Before fi xing it, make sure the indoor unit can be controlled from the remote controller.
  • Page 17 COOLING OPERATION Use the device for cooling when the outdoor temperature is 21 ~ 46°C. If indoors humidity is very high (over 80%), some dew may form on the air outlet grille of the indoor unit. Press the selector button so that the display indicates (COOL).
  • Page 18 SILENT OPERATION During Cooling mode, press the selector button so that the display indicates (SILENT) along with the (COOL) symbol. Silent operation starts with a beep. The FAN SPEED will be automatically changed to SILENT. CANCELLATION of SILENT Operation Cancel Condition Operation mode after cancel Key press Stop operation...
  • Page 19 DEHUMIDIFYING OPERATION Use the device for dehumidifying when the room temperature is over 16°C. When it is under 15°C, the dehumidifying function will not work. Press the selector button so that the display indicates (DEHUMIDIFY). The FAN SPEED is set at SILENT or LOW automatically. The FAN SPEED button can be used to change between SILENT and LOW only.
  • Page 20 FAN OPERATION In Fan operation mode the device is function as an air circulator. Press the selector button so that the display indicates (FAN). Set the desired FAN SPEED with the button. (the display indicates the selectable setting). (HI) : High fan speed. (MED) : Medium fan speed.
  • Page 21 ONE-TOUCH POWERFUL MODE Press the button. Operation start with a signal received sound “beep”. ● Unit will be forced operate in (COOL) with SUPER ● COOL fan speed for 60 minutes. Indicator appear during this period. (Operation lamp at indoor unit is blinking). After 60 minutes, operation lamp stop blinking and ●...
  • Page 22 HOW TO SET THE AIR SLEEP TIMER Press the button, and the display changes as shown below. Mode Indication Air Sleep Timer Air Sleep Timer Air Sleep Timer: The device will continue working for the designated number of hours and then turn off. Point the signal window of the remote controller toward the indoor unit, and press the AIR SLEEP TIMER button.
  • Page 23 REFRESH MODE OPERATION To slightly reduce air blow temperature of air conditioner and room humidity if unit has been operating for a long period of time for the day. (a) During COOLING or SILENT operation, press the to allow unit to start REFRESH operation.
  • Page 24 HOW TO SET THE TIMER ■ ON Timer and OFF Timer are available. OFF Timer Reservation ■ Operation stop at setting time OFF TIMER setting Select the OFF TIMER by pressing the (OFF ● TIMER) Button. Setting time will change according to the below sequence ●...
  • Page 25 AIR FLOW LOUVERS ADJUSTMENTS Adjustment of the conditioned air in the upward and downward directions. The horizontal air defl ector is automatically set to the proper angle suitable for each operation. The defl ector can be swung up and down continuously and also set to the desired angle using the “...
  • Page 26 FROST WASH OPERATION (GENERAL INFORMATION) Cleaning function by frosting the indoor exchanger and allowing melted water to wash away dust particles collected on surface of exchanger. This function only applicable during OFF mode. Note ● Operate FROST WASH when under the following conditions Outdoor temperature 21°C ~ 43°C Indoor temperature...
  • Page 27 HOW TO EXCHANGE THE BATTERIES IN THE REMOTE CONTROLLER When using the remote control, if there is no response from the air conditioner unit and or the remote control has fading and dim displays, the batteries in the remote control device need to be removed and replaced with new ones Remove the cover as shown in the fi...
  • Page 28 THE IDEAL WAYS OF OPERATION Suitable Room Temperature Install curtain or blinds It is possible to reduce Warning heat entering the room Freezing temperature is bad for health through windows. and a waste of electric power. Ventilation Do Not Forget To Clean The Pre-Filter Dusty air fi...
  • Page 29 ATTACHING THE AIR PURIFYING FILTERS 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-fi lter Push upward to release the claws and pull out the ●...
  • Page 30 MAINTENANCE CAUTION Before cleaning, stop operation and switch off the power supply. PRE-FILTER Clean the Pre-fi lter, as it removes dust inside the room. In case the Pre-fi lter is full of dust, the air fl ow will decrease and the cooling capacity will be reduced. Further, noise may occur. Be sure to clean the Pre-fi...
  • Page 31 CLEANING OF FRONT PANEL Remove the front panel and wash with clean water. ● Wash it with a soft sponge. After using neutral detergent, wash thoroughly with clean water. When front panel is not removed, wipe it with a soft dry cloth. ●...
  • Page 32 Notes REGULAR INSPECTION In quiet or stop operation, the ● following phenomena may PLEASE CHECK THE FOLLOWING occassionally occur, but they are POINTS BY QUALIFIED SERVICE not abnormal for the operation. PERSONNEL EITHER EVERY HALF (1) Slight flowing noise of refrigerant in the refrigerating YEARLY OR YEARLY.
  • Page 33 CONSTRUCTION AND DIMENSIONAL DIAGRAM FOR INDOOR INDOOR UNIT MODEL RAK-CH18PCASV, RAK-CH24PCASV Unit: – 33 –...
  • Page 34 CONSTRUCTION AND DIMENSIONAL DIAGRAM FOR INDOOR OUTDOOR UNIT MODEL RAC-CH18PCASV – 34 –...
  • Page 35 CONSTRUCTION AND DIMENSIONAL DIAGRAM FOR INDOOR OUTDOOR UNIT MODEL RAC-CH24PCASV – 35 –...
  • Page 36 MAIN PARTS COMPONENT THERMOSTAT (Room Temperature Thermistor) Thermostat Specifi cations RAK-CH18PCASV, RAK-CH24PCASV MODEL THERMOSTAT MODEL OPERATION COOL 15.6 (60.1) INDICATION 15.3 (59.5) TEMPERATURE °C 23.6 (74.5) INDICATION 23.3 (73.9) 31.6 (88.9) INDICATION 31.3 (88.3) INDOOR FAN MOTOR Fan Motor Specifi cations MODEL RAK-CH18PCASV, RAK-CH24PCASV RAK-CJ18PCAST, RAK-CJ24PCAST...
  • Page 37 RAC-CH18PCASV RAC-CH24PCASV ASD088CKPA6JK6B GTD141RKQB7JV6B RED (V) YELLOW (U) WHITE (W) CAUTION When the Air Conditioner has been operated for a long time with the capillary tubes clogged or crushed or with too little refrigerant, check the color of the refrigerant oil inside the compressor. If the color has been changed conspicuously, replace the compressor.
  • Page 38 MODEL RAK-CH18PCASV/RAC-CH18PCASV RAK-CH24PCASV/RAC-CH24PCASV - 38 -...
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  • Page 40 CIRCUIT DIAGRAM MODEL: RAK-CH18PCASV, RAK-CH24PCASV Indoor Fan Motor TYPE OF CAPACITOR MOUNTING TYPE 3. MOUNTING FACE F- FILM CAPACITOR A- AXIAL A- COMPONENT SIDE VH-6P C- CERAMIC CAPACITOR R- RADIAL B- SOLDER SIDE D- ELETROLYTIC CAPACITOR P- RADIAL(7.5mm PITCH) MAIN P.W.B H- HAND INSERT WR006A WR006B...
  • Page 41 MODEL: RAC-CH18PCASV, RAC-CH24PCASV - 41 -...
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  • Page 43 PRINTED BOARD LOCATION DIAGRAM MODEL: RAK-CH18PCASV, RAK-CH24PCASV - 43 -...
  • Page 44 MODEL: RAC-CH18PCASV, RAC-CH24PCASV - 44 -...
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  • Page 47 BLOCK DIAGRAM RAK-CH18PCASV, RAK-CH24PCASV RAC-CH18PCASV, RAC-CH24PCASV - 47 -...
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  • Page 49 Notes: (1) Condition for entering into Cool Dashed mode. When fan set to “Hi” or “Auto mode” and temperature difference between indoor temperature and set temperature has a corresponding compressor rpm (calculated value in Table 2) larger than CMAX. (2) Cool Dashed will release when i) a maximum 25 minutes is lapsed and ii) room temperature is lower than set temperature –3°C (thermo off) and iii) when room temperature has achieved setting temperature –1°C then maximum Cool Dashed time will be revised to 20 minutes.
  • Page 50 Notes: (1) If the room temperature is (cooling preset temperature) - (1.33°C) or less after 30 seconds from starting the operation, the operation is done assuming as the preset temperature = (room temperature at the time) - (2°C). (2) The indoor fan is operated in the “Lo/Silent” mode. During thermo OFF indoor fan will be OFF for 5 minutes and ON for 1 minute. Indoor fan will go to FWSS (350 rpm). (3) When the operation is started by the themostat turning ON, the start of the indoor fan is delayed 32 seconds after the start of compressor operation.
  • Page 51 REFRIGERATING CYCLE DIAGRAM MODEL: RAK-C H 18PCASV / RAC-C H 18PCASV MODEL: RAK-C H 4PCASV / RAC-C H 24PCASV - 51 -...
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  • Page 54 DESCRIPTION OF MAIN CIRCUIT OPERATION MODEL: RAK-CH18PCASV / RAK-CH24PCASV - 54 5...
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  • Page 63 DESCRIPTION OF MAIN CIRCUIT OPERATION MODEL RAC-CH18PCASV, RAC-CH24PCASV - 63 -...
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  • Page 72 TROUBLE SHOOTING MODEL RAC-CH18PCASV, RAC-CH24PCASV - 72 -...
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  • Page 76 Refrigerant cycle defective Refrigerant cycle defective once Connection cable is reverse Fix CN2 connector Action/replacement parts,etc. FU1 (3.15A) fuse blown Replace the part which caused blowing/disconnection of FU1 fuse. Come off or disconnection of the Fix CN16 connector connector for indicating P.W.B Refer to the service guide for how to determine the failed part Failure of control P.W.B - 76 -...
  • Page 77 SELF-DIAGNOSIS LIGHTING MODE MODEL RAC- , RAC-CH CH18PCASV 24PCASV - 77 -...
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  • Page 105 PARTS LIST AND DIAGRAM INDOOR UNIT MODEL : RAK-CH18PCASV, RAK-CH24PCASV - 105 -...
  • Page 106 MODEL RAK-CH18PCASV PMRAS-VX13CET REMOTE CONTROL SUPPORT PMK-CH18PCASV PMRAS-PH10CNT PMK-CH18PCASV TANGENTIAL FLOW FAN PMRAS-S18CPA AUTO SWEEP MOTOR PMRAK-18QPA - 106 -...
  • Page 107 MODEL RAK-CH24PCASV PMRAD-50DH7 REMOTE CONTROL SUPPORT PMRAS-VX13CET PMRAS-PH10CNT PMK-CH18PCASV PMRAS-XH10CKT TANGENTIAL FLOW FAN PMRAS-S18CPA TERMINAL BOARD(LN) AUTO SWEEP MOTOR PMRAK-18QPA - 107 -...
  • Page 108 PARTS LIST AND DIAGRAM OUTDOOR UNIT MODEL : RAC-CH18PCASV - 108 -...
  • Page 109 MODEL RAC-CH18PCASV PART NO. Q’TY / UNIT PARTS NAME KPNT1 PUSH NUT PMRAC-PH10CMT THERMISTOR (OH) PMRAC-50YHA2 THERMISTOR (OUTSIDE TEMPERATURE) PMRAC-X13CX VALVE 2S PMRAC-X13CXK VALVE 4S PMRAC-EH10CKT SIDE PLATE (L) PMRAC-EH10CKT SIDE PLATE (R) PMRAC-EH10CKT CABINET PMRAC-EH10CKT D-GRILL PMRAC-EH10CKT TOP COVER PMRAC-EH10CKT SV-COVER PMRAC-F10CJ...
  • Page 110 PARTS LIST AND DIAGRAM OUTDOOR UNIT MODEL : RAC-CH24PCASV - 110 -...
  • Page 111 MODEL RAC-CH24PCASV PART NO. Q’TY / UNIT PARTS NAME KPNT1 PUSH NUT PMRAC-XH18CKT REACTOR PMRAC-50YHA2 THERMISTOR (OUTSIDE TEMPERATURE) PMC-CJ24PCAST CONDENSER PMRAC-PH24CMT SUPPORT (FAN MOTOR) PMRAC-40CNH2 THERMISTOR (0H) PMRAC-PH24CMT SV-COVER PMC-CJ24PCAST P.W.B (MAIN) PMRAC-XH24CKT FAN MOTOR PMRAC-PH24CMT COMPRESSOR PMRAC-X18CGT TERMINAL BOARD (3P) PMRAC-PH24CMT TOP COVER PMC-CJ24PCAST...
  • Page 112 PM NO. 0825E RAK-CH18PCASV/RAC-CH18PCASV RAK-CH24PCASV/RAC-CH24PCASV Printed in Malaysia SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT Johnson Control-Hitachi Air Conditioning Malaysia Sdn. Bhd. FEBRUARY 2024...

This manual is also suitable for:

Airhome 300 rak-cj18pcasvAirhome 300 rak-cj24pcasvAirhome 300 rac-ch18pcasvAirhome 300 rac-ch24pcasvAirhome 300 rar-m0a6