Hitachi RAF-25RXB Service Manual
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Hitachi RAF-25RXB Service Manual

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Table of Contents

See also: Instruction Manual , Installation Manual
SERVICE MANUAL
TECHNICAL INFORMATION
FOR SERVICE PERSONNEL ONLY
INDOOR UNIT
OUTDOOR UNIT
RAC-25FXB
RAC-35FXB
SPECIFICATIONS
TYPE
MODEL
POWER SOURCE
TOTAL INPUT (W)
TOTAL AMPERES (A)
COOLING
(KW)
CAPACITY
(B.T.U./h)
TOTAL INPUT (W)
TOTAL AMPERES (A)
HEATING
(KW)
CAPACITY
(B.T.U./h)
W
DIMENSIONS
H
(mm)
D
NET WEIGHT
(Kg)
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
ROOM AIR CONDITIONER
FEBRUARY 2015
RAF-25RXB
RAF-35RXB
RAF-50RXB
RAC-50FXB
INDOOR UNIT OUTDOOR UNIT
RAF-25RXB
RAC-25FXB
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
750(+65)
590
548
215
288(+27.5)
15
34
INDOOR UNIT + OUTDOOR UNIT
TC
NO. 0842E
RAF-25RXB/RAC-25FXB
RAF-35RXB/RAC-35FXB
RAF-50RXB/RAC-50FXB
REFER TO THE FOUNDATION MANUAL
SPECIFICATIONS---------------------------------------------------- 1−1
HOW TO USE---------------------------------------------------------- 2−1
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
SERVICE CALL Q & A----------------------------------------------- 12−1
TROUBLE SHOOTING---------------------------------------------- 13−1
VARIOUS SETTINGS------------------------------------------------
PARTS LIST AND DIAGRAM--------------------------------------
DC INVERTER
INDOOR UNIT OUTDOOR UNIT INDOOR UNIT OUTDOOR UNIT
RAF-35RXB
RAC-35FXB
1 PHASE, 50HZ, 220-230V
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
750(+65)
590
548
215
288(+27.5)
15
34
Hitachi Appliances, Inc.
CONTENTS
RAF-50RXB
RAC-50FXB
1 PHASE, 50HZ, 220-230V
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)
750
800(+63)
590
736
215
350(+35.5)
15
49.5
※After installation
14−1
15−1

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  • Page 1: Table Of Contents

    11,600(3,070-15,010) 15,350(3,070-17,060) 22,180(3,070-27,640) (B.T.U./h) 750(+65) 750(+65) 800(+63) DIMENSIONS (mm) 288(+27.5) 288(+27.5) 350(+35.5) NET WEIGHT (Kg) 49.5 ※After installation SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT ROOM AIR CONDITIONER INDOOR UNIT + OUTDOOR UNIT FEBRUARY 2015 Hitachi Appliances, Inc.
  • Page 2 1. 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 manufactures 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 Al. stainless steel, etc.) Bare copper wire (for body earth) Working table Resistor 1MΩ (1/2W) Staple Earth wire Fig.3 Grounding of the working table soldering iron Grounding wire Screw stop at the screwed part using a rag plate...
  • Page 5 CAUTION 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. When it thunders near by, it is recommend to stop the operation and turn off the circuit break er for safety. In the event of power failure,the room air conditioner will restare automatically in the previously selected mode once the power is restored.
  • Page 6 This manual describes only points that differ from RAM 33NP2B(PM No. 0581E) RAM 40NP2B(PM No. 0582E) RAM 53NP2B, RAM 53NP3B(PM No. 0583E) RAM 68NP3B(PM No. 0584E) RAM 70NP4B(PM No. 0585E) RAM 90NP5B(PM No. 0586E) RAM 110NP6B(PM No. 0587E) for items not described in this manual. Combination table Indoor unit RAF 25RXB...

  • Page 7: Specifications

    SPECIFICATIONS RAF-25RXB RAF-35RXB MODEL RAC-25FXB RAC-35FXB RAC-50FXB RAF-50RXB FAN MOTOR 47W (DC120~380V) 30W (DC325V) FAN MOTOR CAPACITOR FAN MOTOR PROTECTOR COMPRESSOR – ASD084SFNA7JK1 ASG133CDNB7AT COMPRESSOR MOTOR CAPACITOR OVERLOAD PROTECTOR YES(INTERNAL) OVERHEAT PROTECTOR FUSE (for MICROPROCESSOR) 15A, 2A, 3A, 3.15A 25A, 2A, 3A, 3.15A 3.15A...
  • Page 8 Figure showing the installation of lndoor and Outdoor unit (For example:wall instalation) MODEL RAF-25RXB/RAC-25FXB Above 150mm RAF-35RXB/RAC-35FXB Above 200mm Hanger Above 100mm Sheet Be sure to completely seal any gap with putty. When mounting on a wall (up to 150~500 mm from the floor surface)
  • Page 9 Figure showing the installation of lndoor and Outdoor unit MODEL RAF-50RXB/RAC-50FXB (For example:wall instalation) Above 150mm Above 200mm Hanger Above 100mm Sheet Be sure to completely seal any gap with putty. When mounting on a wall (up to 150~500 mm from the floor surface) Bush The indoor piping should be insulated with the enclosed...
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  • Page 30: Construction And Dimensional Diagram

    CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAF-25RXB,RAF-35RXB,RAF-50RXB INDOOR UNIT Unit : mm ø65 Standard underfloor piping position Wireless remote Cabinet controller Front panel Air inlet 19.3 Small dia. pipe (ø6.35) Large dia. pipe RAF-50RXB:ø12.7 RAF-35RXB:ø9.52 RAF-25RXB:ø9.52 AIir outlet ø5Hole for fixing to floor...
  • Page 31 CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAC-25FXB,RAC-35FXB 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) Fixing hole Drain hole Drain hole Service space...
  • Page 32 CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAC-50FXB Unit : mm OUTDOOR UNIT 408.5 202.5 880.5 (35.5) (23) 111.5 543.5 More More than than 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.

  • Page 33: Main Parts Component

    MAIN PARTS COMPONENT THERMOSTAT (Room temperature Thermistor) Thermostat Specifications MODEL RAF-25RXB,RAF-35RXB,RAF-50RXB THERMOSTAT MODEL OPERATION MODE COOL HEAT 15.3 (59.54) 16.7 (62.06) INDICATION 15.0 (59.00) 16.7 (62.06) 23.3 (73.94) 24.7 (76.46) TEMPERATURE INDICATION ˚C (˚F) 23.0 (73.40) 24.7 (76.46) 31.3 (88.34) 32.7...
  • Page 34 COMPRESSOR MOTOR Compressor Motor Specifications MODEL RAC-25/35FXB RAC-50FXB COMPRESSOR TYPE ASD084SFNA7JK1 ASG133CDNB7AT POWER SOURCE 100 - 240 V 220 - 350 V WHITE YELLOW 2M= 0.74 2M= 2.4 2M= 0.88 2M= 2.0 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 35: Wiring Diagram

    WIRING DIAGRAM MODEL RAC-25/35FXB MODEL RAC-50FXB RAF-25/35/50RXB Ｂ Ｌ Ｋ ： Ｂ Ｌ Ａ Ｃ Ｋ Ｇ Ｒ Ｎ ： Ｇ Ｒ Ｅ Ｅ Ｎ Ｒ Ｅ Ｄ ： Ｒ Ｅ Ｄ ＷＨ Ｔ ： ＷＨ Ｉ Ｔ Ｅ Ｇ Ｒ Ｙ ： Ｇ Ｒ Ａ Ｙ Ｉ...
  • Page 36 WIRING DIAGRAM OF THE PRINTED WIRING BOARD [Remote controller] RAR-6N4 SWB~SW10 Carbon SW SWING EXTENDED Reset carbon SW 5ー2...

  • Page 37: Circuit Diagram

    CIRCUIT DIAGRAM MODEL RAF-25/35/50RXB Indoor Fan Motor XH-7P-Top Resistor Resistor CAPACITOR WIRE Main PCB 2,3Pins are not available ASSY ASSY POWER MOUNT ASSY POWER MOUNT ASSY VALUE VOLT MOUNT TEMP MOUNT SYMBOL VALUE(Ω) FORM SYMBOL VALUE(Ω) FORM SYMBOL TYPE FORM SYMBOL MODEL NAME FORM...
  • Page 38 MODEL RAC-25/35FXB 6ー2...
  • Page 39 MODEL RAC-50FXB 6ー3...
  • Page 40 7ー1...

  • Page 41: Basic Mode

    BASIC MODE MODEL RAF-25/35/50RXB button button button button button button button button button button button Set to “ultra-Lo”, “Silent”, “Lo”, “Med”, “Hi”, “ultra-Hi” or “stop” depending on the room temperature, time and heat exchanger temperature. Set to “stop” if the heat exchanger temperature is “DNZKOF”...
  • Page 42 Table 1 Mode data file MODEL RAF-25RXB RAF-35RXB RAF-50RXB LABEL NAME VALUE WMAX 6000 6000 6000 WMAX2 6000 6000 6000 WSTD 4000 4550 4800 WJKMAX 3400 3400 4200 WBEMAX 3200 3200 3400 WSZMAX 3200 3200 3400 CMAX 3600 3800 4900...
  • Page 43 Temperature set for cooling and dehumiditying (value set by remote control + [SHIFTC]) 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 44 2000 (1) Pressing the "POWERFUL" button will reduce the temperature setting by PWSFTC. (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" button and "POWERFUL"button during powerful operation wil cancel the powerful operation.
  • Page 45 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” mode. During thermo OFF indoor fan will be OFF for 5 minutes and ON for 1 minute. (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 46 (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" button and "POWERFUL"button during powerful operation wil cancel the powerful operation. (5) If the sleep timer is set during powerful operation, the powerful operation will be canceled.
  • Page 47 Heating set temperature (remote control set temperature + [SHIFTW]) Notes: (1) Condition for entering into hot dashed mode. When fan set to "Hi" or "Auto" and i) room temperature is 18 or less, and ii) outdoor temperature is 10 or less, and iii) compressor speed (P section) due to temperature difference between setting temperature(including shift value only) and room temperature is WMAX or more.
  • Page 48 FCLN_SUF_P CLNCMP SILENT Silent button Indoor WSZMAX/CSZMAX Compresson speed Outdoor Notes: Can’t set POWERFUL and SILENT at the same time. 8ー8...
  • Page 49 (Remote control set temperature + SFTLVHM) Same as Basic Heating operation (1) Pressing the "POWERFUL" button will increase the temperature setting by PWSFTW. (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. STARCPIL (4) Defrost is inhibited for 20 minutes after the start of the powerful operation.
  • Page 50 RAF/C-25R/FXB RAF/C-35R/FXB RAF/C-50R/FXB Reversing valve defrosting Reversing valve defrosting 15' or more Auto fresh defrosting Over defrosting inhibit period 15' or more Auto fresh defrosting Over defrosting inhibit period Fan speed Stop Start/Stop button set to "Hi" Fan speed Stop set to "Hi"...

  • Page 51: Refrigerating Cycle Diagram

    REFRIGERATING CYCLE DIAGRAM MODEL RAF-25/35RXB RAC-25/35FXB COOLING CYCLE OUTDOOR UNIT INDOOR UNIT Indoor heat ø12.7 exchanger ø7.0 ø8.0 Silencer ø7.0 ø12.7 ø7.0 ø7.0 ø8.0 HEATING CYCLE INDOOR UNIT OUTDOOR UNIT Indoor heat ø12.7 exchanger ø7.0 ø8.0 Silencer ø7.0 ø12.7 ø7.0 ø7.0 ø8.0 9ー1...
  • Page 52 REFRIGERATING CYCLE DIAGRAM MODEL RAF-50RXB RAC-50FXB COOLING CYCLE OUTDOOR UNIT INDOOR UNIT Indoor heat ø12.7 exchanger ø7.0 ø8.0 Silencer ø7.0 ø12.7 ø7.0 ø7.0 ø8.0 HEATING CYCLE INDOOR UNIT OUTDOOR UNIT Indoor heat ø12.7 exchanger ø7.0 ø8.0 Silencer ø7.0 ø12.7 ø7.0 ø7.0 ø8.0 9ー2...

  • Page 53: Procedure For Disassembly And Reassembly

    Procedure for Disassembly and Reassembly <INDOOR UNIT> RAF-25/35/50RXB 1. AIR FILTER Clean the air filter, as it removes dust inside the room. Be sure to clean the filter once every two weeks so as not to consume electricity unnecessarily. PROCEDURE Open the front panel.
  • Page 54 3. Remove the front cover Latch Front Panel Latch Screw Screw Front Panel ① Push the latch at both sides to open the front panel. Pull out the filter and remove 3 screws. ② Lift up the front panel and latch the claws firmly the lower part of rear of the front panel.
  • Page 55 5. INDICATING P.W.B. (1) Remove the front panel and the front cover. (2) Remove the three fixing screws of the suction frame. (3) Remove the one fixing screw of the indicating P.W.B. case. (4) Slide the indicating P.W.B. case to the right while removing it from the suction frame. Suction frame indicating P.W.B.
  • Page 56 7. DISCHARGE FRAME (1) Remove the front panel and the front cover. (2) Remove the two fixing screws of the discharge frame. (3) Remove the screw on the rat prevention cover. (4) Remove the hook that is the fixation of a lower center part of Discharge frame. (5) Lower the rear side of the discharge frame, remove the tab on the interfit section, and then pull out the discharge frame towards you.
  • Page 57 9. FAN MOTOR AND TANGENTIAL AIR FLOW FAN (1) Two screws that are the fixation of evaporator are removed. (2) The tab where the left side of evaporator is fixed is removed. (3) Evaporator is lifted up and remove. Fixation tab Fixation screws Evaporator (4) Two screws that is the fixation of fan-motor support is removed,...
  • Page 58 (6)Remove P lock which binds lead wires. OUTDOOR UNIT MODEL RAC-25FXB, RAC-35FXB 1. Electrical parts (7)Set the electrical box upside down. (1)Remove the upper cover fixing screws and lift the cover to remove it. (2)Remove the service valve cover. (3)Remove the terminal plate cover. (4)Remove the right side cover.
  • Page 59 OUTDOOR UNIT MODEL RAC-50FXB 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. (3)Remove the front cover lock screw. (4)Lower the right side of the front cover and pull it forward.

  • Page 60: Description Of Main Circuit Operation

    DESCRIPTION OF MAIN CIRCUIT OPERATION MODEL RAF-25/35/50RXB 1. Control power circuit Switching power circuit Fig. 1-1 · An AC power supply from outdoor unit passes through the 3.15 A fuse, varistor (VA001), and noise filter circuit and rectified and smoothed by DB1 and C003 to become a DC current 325 V. It is then supplied to indoor fan motor drive circuit,and switching power circuit.
  • Page 61 2. Reset Circuit Reset R503 Microcomputer R502 IC501 Fig.2-1 Timing chart Voltage 5 . 0V pin of IC501 supply voltage RES detecting voltage RES canceling voltage 4 . 4V 4 . 2V Voltage pin of IC501 output voltage 5.0V pin of microcomputer Fig.2-2 Reset circuit is to initialize the indoor unit microcomputer when switching ON the power or after recovering from power failure.
  • Page 62 3. Drive circuit of the indoor fan motor Primary 325V Primary 18.5V Indoor fan motor Power siganl of indoor fan(from pin 57 of microcomputer) Primary 0 V Rotation speed feedback signal (to pin of microcomputer) Output signal of indoor fan (to pin of microcomputer) Fig.
  • Page 63 Caution The indoor fan motor and drive circuit are connected to the primary power supply. They therefore have voltage to ground. Guard against electric shocks. Caution ny circumstances detach or reattach a connector. Any such practice would cause a high voltage to r fan motor and board circuit being destroyed.
  • Page 64 6. Initial Setting Circuit (IC531) When power is supplied, the microcomputer reads the data in IC531 (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 IC531; data will not be erased even when power is turned off. Fig.
  • Page 65 DSW1 R695 R903 R741 R905 R740 R906 R642 DSW1 11ー6...
  • Page 66 11. Indoor/outdoor communication circuits Indoor unit side Outdoor unit side Inverter circuit Outdoor C302 microcomputer Indoor transmission circuit Indoor microcomputer (IC601) Outdoor Indoor/outdoor communication Outdoor reception chopper output (30kHz) reception circuit input Indoor transmission output Outdoor transmission circuit Outdoor transmission output Indoor reception input Indoor unit reception circuit...
  • Page 67 12. Stepping motor drive circuit SUCTION DEFLECTOR CN19 MOTOR IC601 HORIZONTAL SWEEP MOTOR ø4 HORIZONTAL SWEEP MOTOR ø3 HORIZONTAL SWEEP MOTOR ø2 HORIZONTAL SWEEP MOTOR ø1 VERTICAL SWEEP CN15 MOTOR1(Small) VERTICAL SWEEP MOTOR1 ø4 VERTICAL SWEEP MOTOR1 ø3 VERTICAL SWEEP MOTOR1 ø2 VERTICAL SWEEP MOTOR1 ø1 VERTICAL SWEEP...
  • Page 68 MODEL RAC-25/35FXB 300-330 Main parts C021-C023,500 ,450V) 11ー9...
  • Page 69 2. Power circuit (Low voltage) Fig. 2-1 The 230V AC voltage is rectified to DC voltage (B-12V,16V,12V,5V) pass through switching control IC (ICI), switching transformer. (1) B-12V Power supply for electrical expansion valve. (2) 16V Power supply for IPM driver circuit of compressor and fan motor, IGBT action. (3) 12V Power supply for 4 way valve relay, power relay, inrush current relay,motor current amplification, (4) 5V...
  • Page 70 Main parts 001,C002,C003,C004,C005,C011,C013,C014，NF1 1,2,5,8. DC/DC convertor IC (DC12V DC5V). L105 (JUMPER) D110 (EARTH) L104 (JUMPER) 0.5V D110 (EARTH) L103 (JUMPER) 15.5 1.5V D110 (EARTH) 1.0V R120 B-12V Expansion valve B-12V O/P 2.5V R120 B-0V) 1.0V 11ー11...
  • Page 71 4.Reversing valve control circuit This model reversing valve control used to control the realy ON/OFF of the revesing valve, and also control the coil of the reversing valve ON/OFF. The realay ON/OFF has different type when in the different operation mode. You can see each operation mode as fllows.
  • Page 72 HIC P.W.B 70 74 75 11ー13...
  • Page 73 2.Failure phenomenon: The product will not receive a remote control signal. Situation The product does not receive a remote control signal. It is not very responsive. (The product does run normally in response to the emergency operation switch.) Estimated failure ·...
  • Page 74 2A Fuse DC300 -330V 11ー15...
  • Page 75 ( DC300-330V ) 11ー16...
  • Page 76 MODEL RAC-50FXB 300-330 11ー17...
  • Page 77 C021-C023,500 ,450V) 33 ACT R249 IP CUT 300-330 11ー18...
  • Page 78 2. Power circuit (Low voltage) Fig. 2-1 The 230V AC voltage is rectified to DC voltage (B-12V,16V,12V,5V) pass through switching control IC (ICI), switching transformer. (1) B-12V Power supply for electrical expansion valve. (2) 16V Power supply for IPM driver circuit of compressor and fan motor, IGBT action. (3) 12V Power supply for 4 way valve relay, power relay, inrush current relay,motor current amplification, (4) 5V...
  • Page 79 Main parts 001,C002,C003,C004,C005,C011,C013,C014，NF1 1,2,5,8. DC/DC convertor IC (DC12V DC5V). L105 (JUMPER) D110 (EARTH) L104 (JUMPER) 0.5V D110 (EARTH) L103 (JUMPER) 15.5 1.5V D110 (EARTH) 1.0V R148 B-12V Expansion valve B-12V O/P 2.5V 1 “ - ” 1.0V 11ー20...
  • Page 80 4.Reversing valve control circuit This model reversing valve control used to control the realy ON/OFF of the revesing valve, and also control the coil of the reversing valve ON/OFF. The realay ON/OFF has different type when in the different operation mode. You can see each operation mode as fllows.
  • Page 81 HIC P.W.B 70 74 75 11ー22...
  • Page 82 6. Electric expansion valve circuit 11ー23...
  • Page 83 2A Fuse DC300 -330V 11ー24...
  • Page 84 ( DC300-330V ) 11ー25...

  • Page 85: Service Call Q

    SERVICE CALL Q&A MODEL RAF-25/35/50RXB Cooling operation The compressor sometimes Cooling when the room Check if the heat stops during cooling. temperature is low may exchanger of the indoor cause the heat exchanger unit is covered with frost. of the indoor unit to gather Wait for 3 to 4 minutes frost.
  • Page 86 Common, etc. In “automatic fan speed” mode, the In fan speed “automatic” mode, This does not abnormal. It indoor fan changes from “Hi” to “Med” the product will sense the heat is because the cold wind to “Low”. exchange temperature and, prevention is working.
  • Page 87 Wireless remote control The timer will not become set. Have you set the product to the current time? The timer cannot be set unless it is set to the current time. The current time When set to the current The current time display will disappears 10 seconds time setting, the reading disappear at once.

  • Page 88: Trouble Shooting

    TROUBLE SHOOTING MODEL RAC-25/35/50FXB Inspection instructions Indoor fan motor Power supply Indoor Electrical Outdoor Electrical 1Φ 230V 50Hz Compressor motor Warning Note that the 0 V line of the 0V line outdoor electrical parts and the primary power circuit of Control circuit Control circuit the indoor electrical parts...
  • Page 89 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 (375μF x 2). During continuity check for each circuit part of the outdoor unit, be sure to discharge the smoothing capacitors.
  • Page 90 STRUCTURE OF AN INDOOR UNIT ELECTRIC PARTS RAF-25/35/50RXB ELECTRICAL COVER FIXING SCREW FIXING SCREW Removing electrical parts 1. Remove the electrical parts cover. 2. Remove the connectors from the CN4 (heat exchange thermistor), CN15 (stepping motor), CN19 (stepping motor), CN2 (fan motor), and CN17 (humidity thermistor). 3.
  • Page 91 Other instructions (1) Detaching and reattaching the receptacles for tab terminal All the receptacles for connecting tab terminals are with a locking mechanism. Forcibly pulling any such receptacle without unlocking it will destroy it. Be on guard. When reconnecting it, insert it securely all the way home. ·...
  • Page 92 Troubleshooting support 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 "time lamp" blinking 4 times. ·...
  • Page 93 Self-diagnosis display function (indoor side display) While the "timer lamp" (orange), of the indoor unit is blinking, troubleshoot the product while referring to the table below. 1. How to count the lamp blinking frequency [An example of 5-time blinking] ・ The product will repeat blinking with 2-second 2-second 2-second intermissions.
  • Page 94 13ー7...
  • Page 95 IC531 IC531 IC531 13ー8...
  • Page 96 13ー9...
  • Page 97 SELF-DIAGNOSIS LIGHTING MODE MODEL RAC-50FXB 13ー10...
  • Page 98 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 control setting: "cooling mode, temperature setting 16 "...
  • Page 99 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? blinding not 4 times 4 times...
  • Page 100 1. Failure phenomenon: The power will not become turned on. Neither initialization, remote control, nor any other step works on the vane position at power-on. Situation [ Estimated failure · 3.15 A fuse blown out Estimated cause of fuse blowout · Abnormally high voltage applied to the power supply ·...
  • Page 101 2.Failure phenomenon: The product will not receive a remote control signal. Situation The product does not receive a remote control signal. It is not very responsive. (The product does run normally in response to the emergency operation switch.) Estimated failure ·...
  • Page 102 How to identify sources of jamming in the reception of remote control signals [ Situation ] The product may become poorly responsive to remote control signals due to external factors even though the product itself is trouble-free. [ Estimating sources of jamming ] Identify the installation status of the air-conditioner and the indoor and outdoor environments to identify possible causes of the jamming.
  • Page 103 Effects of other Checking points electrical products · Check the effects of light and power noises coming from other electrical products. · Turn on and off the electrical products, turn off the power and turn on the power, and check their effects on the reception of remote control signals.
  • Page 104 3. Failure phenomenon: The compressor will not run. [ Situation ] The compressor will not run (the same state as the thermometer turned off), the product receives remote control signals normally. The self-diagnosis lamp (LD301) of the outdoor unit blinks once or becomes turned off. [ Estimated failure locations ] ·...
  • Page 105 4. Failure phenomenon: The fan motor will not stop. Situation I have conducted the stop operation on the product by remote control, but the indoor fan motor will not stop. (It stopped about 10 minutes later.) Estimated failure locations · Indoor fan motor ·...
  • Page 106 5. Timer lamp blinking: blinking once [Situation] The timer lamp blinks one time and the product will not operate. (This is not a sign of a breakdown.) [Estimated failure locations] · Reversing valve defective. · The refrigerating cycle block gas leak. 6.
  • Page 107 9 . Timer lamp blinking: blinking 9 times [Situation] The timer lamp blinks 9 times and the product will not run. [Estimated failure location] Loose connector, wire break, or short-circuit in the room temperature thermistor, heat exchanger thermistor. [Cautions] Starting the product by remote control will initiate failure detection. (Merely turning on the power will not activate the failure detection function.) [Diagnosis flow] Initiating troubleshooting...
  • Page 108 10. Timer lamp blinking: blinking 10 times [Situation] The timer lamp blinks 10 times and the product will not run. [Estimated failure locations] · Loose connector or wire break in the indoor fan motor · Indoor fan motor mechanically locked ·...
  • Page 109 11. Timer lamp blinking: blinking 12 times [Situation] The timer blinks 12 times and the product will not run. [Estimated failure locations] Erroneous connection in the indoor-outdoor connection line (F cable) Forget to connect CN27 of outdoor P.W.B Wire break or poor insertion of the indoor-outdoor connection line (F cable) Electrical parts in the outdoor unit (communication circuit, power circuit error) Communication error due to noise in other home electronics This does not constitute a failure in the air-conditioner...
  • Page 110 Checking the electrical parts of the outdoor unit 13ー23...
  • Page 111 13ー24...
  • Page 112 13ー25...
  • Page 113 13ー26...
  • Page 114 13ー27...
  • Page 115 13ー28...
  • Page 116 (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 117 Forced cooling operation (Only single connection) The cooling operation can be forcibly performed for collecting refrigerant and inspecting failures. Do not perform the forced cooling operation continuously for long hours, because the compressor continues to be in operational status, regardless of room temperature. ＜How to start the operation＞...
  • Page 118 Cautions 1. Applying power directly to the outdoor unit will cause a rush current to stress the outdoor unit. Therefore, if the indoor unit is not out of order, do not use the method descried in 2). 2. Before making the connections, be sure to turn off the breaker. 3.
  • Page 119 14ー1...
  • Page 120 Please set the DIP switch No.6 to ON accordingly (Refer to page 59). 14ー2...
  • Page 121 14ー3...
  • Page 122 14ー4...
  • Page 123 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. PROCEDURE     Press            [POWERFUL] button and             [TIME (UP)]] button simultaneously for about 5 seconds  when the remote controller is OFF.     Transmission sign lights up with beep from indoor unit simultaneously.    Beep sound pattern :  1) Default setting : Short beep  2) Changed setting : Double beep Fan speed during thermo off Default setting Ultra low Changed setting Set fan speed (When auto fan speed is set, the fan speed is low.) NOTE : (1) The selected fan speed will remain unchanged after the unit is turned off. (2) If Timer reservation has been set, it will be canceled. (3) During time setting and timer setting, this operation cannot be set.
  • Page 124 HOW TO CHANGE THE INTERMITTENT FAN CONTROL SETTING The intermittent fan control during thermo off in Heating mode can be changed by the remote controller.   (This procedure should be done only by service personnel.) It is possible to select from 3 patterns. PROCEDURE 1. Press [START/STOP] button, [Mon‐Sun] button and press [RESET] button simultaneously. Release [RESET] button only and make sure that all marks on the remote controller display are indicated, then release [START/STOP] button and [Mon‐Sun] button. Remote controller now enters “Intermittent Fan Control Change Mode”. Default : Pattern 1 2. Press [ROOM TEMPERATURE setting] [ (UP)]/[ (DOWN)] buttons. (The intermittent pattern changed with indoor unit beep sound.) Transmission sign lights up with beep from indoor unit simultaneously.                Pattern 1 Pattern  2        P attern 3 Pattern 1 Pattern 2 Pattern 3 Single model Continuous 30sec ON/210sec OFF repeatedly 50sec ON/190sec OFF repeatedly Multi model 30sec ON/210sec OFF repeatedly...

  • Page 125: Parts List And Diagram

    PARTS LIST AND DIAGRAM MODEL RAF-25RXB, RAF-35RXB, RAF-50RXB 15ー1...
  • Page 126 MODEL RAF-25RXB, RAF-35RXB, RAF-50RXB PARTS NO. Q’TY/ PARTS NAME UNIT RAF-25RXB RAF-35RXB RAF-50RXB RAF-50A2 FAN MOTOR DC 38W, 1.1kg RAS-N22V TANGENTIAL FAN RAS-E40V2 FAN SUPPORT ASSEMBLY RAF-50A2 FAN MOTOR SUPPORT RAS-E40V2 AUTO SWEEP MOTOR RAF-35RXB RAF-50RXB HEATEXCHANGER ASSEMBLY RAF-50RXB AUTO SWEEP MOTOR...
  • Page 127 MODEL RAC-25FXB, RAC-35FXB 15ー3...
  • Page 128 MODEL RAC-25FXB, RAC-35FXB HHAW PARTS NO. Q’TY/ PARTS NAME UNIT RAC-25FXB RAC-35FXB HWRAC-25FXB BASE HWRAC-25YH4 COMPRESSOR HWRAC-25YH4 PUSH NUT HWRAC-25FXA CONDENSER HWRAC-25FXB REVERSING VALVE HWRAC-25FXB 2S-VALVE HWRAC-25FXB 3S-VALVE HWRAC-25FXB SOUND PROOF COVER ASSEMBLY HWRAC-18WSA SOUND PROOF COVER ASSEMBLY HWRAC-25FXB SOUND PROOF COVER ASSEMBLY HWRAC-E08H ELECTRIC EXPANSION VALVE HWRAC-18WSA...
  • Page 129 MODEL RAC-50FXB 15ー5...
  • Page 130 MODEL RAC-50FXB Q’TY/ HHAW PARTS NO. PARTS NAME UNIT HWRAC-50WXB BASE HWRAC-50WEA COMPRESSOR HWRAC-50WEA COMPRESSOR RUBBER HWRAC-50NX2 PUSH NUT HWRAC-50WXB CONDENSER HWRAC-50FXB REVERSING VALVE HWRAC-50WEA SERVICE VALVE HWRAC-50WEA SERVICE VALVE HWRAC-50NX2 ELECTRIC EXPANSION VALVE HWRAC-50FXB SOUND PROOF HWRAC-50FXB SOUND PROOF HWRAC-50FXB SOUND PROOF HWRAC-50FXB...
  • Page 131 RAF-25RXB / RAC-25FXB TC NO. 0842E RAF-35RXB / RAC-35FXB RAF-50RXB / RAC-50FXB Printed in Japan (HRT)

This manual is also suitable for:

Rac-25fxbRaf-35rxbRaf-50rxbRac-50fxbRac-35fxb

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