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Fujitsu ASU18RLQ Service Instructions Manual

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SERVICE
INSTRUCTION
R410A
SPLIT TYPE
ROOM AIR CONDITIONER
WALL MOUNTED
INVERTER
Models
Indoor unit
ASU15RLQ
ASU18RLQ
type
Outdoor unit
AOU15RLQ
AOU18RLQ

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Summary of Contents for Fujitsu ASU18RLQ

  • Page 1 SPLIT TYPE ROOM AIR CONDITIONER WALL MOUNTED type INVERTER SERVICE INSTRUCTION Models Indoor unit Outdoor unit AOU15RLQ ASU15RLQ AOU18RLQ ASU18RLQ R410A...

  • Page 2: Table Of Contents

    CONTENTS 1. SPECIFICATION ASU15/18RLQ, AOU15/18RLQ..................01-01 2. DIMENSIONS ASU15/18RLQ, AOU15/18RLQ ..................02-01 3. REFRIGERANT SYSTEM DIAGRAM ASU15/18RLQ, AOU15/18RLQ ..................03-01 4. CIRCUIT DIAGRAM ASU15/18RLQ, AOU15/18RLQ..................04-01 5. DESCRIPTION OF EACH CONTROL OPERATION 1. COOLING OPERATION....................05-01 2. HEATING OPERATION....................05-02 3.
  • Page 3 6. REFRIGERANT CAUTION -R410A- 1. R410A TOOLS......................06-01 2. PRECAUTION FOR INSTALLATION................. 06-02 3. PRECAUTION FOR SERVICING................06-04 4. NEW REFRIGERANT R410A..................06-05 5. DEFFERENCE FROM CONVENTIONAL MODEL(R22) AND PRECAUTIONS..06-08 7. TROUBLE SHOOTING 1. WHEN THE UNIT DOES NOT OPERATE AT ALL............ 07-01 2.

  • Page 4: Specification

    R410A WALL MOUNTED type INVERTER 1 . SPECIFICATIONS...
  • Page 5 S P E C I FI C A T IO NS ASU15RLQ ASU18RLQ MODEL NAME AOU15RLQ AOU18RLQ PHASE POWER SOURCE FREQUENCY VOLTAGE 208-230 208-230 4.38 5.28 (1.62~4.98) (1.62~5.58) CAPACITY (230V) 15,000 18,000 Btu /h (5,500~17,000) (5,500~19,000) 1,200 1,730 POWER CONSUMPTION (230V)
  • Page 6 S P E C I FI C A T IO NS ASU15RLQ ASU18RLQ MODEL NAME AOU15RLQ AOU18RLQ CONNECTING METHOD Flare Flare 6.35 6.35 LIQUID SIDE PIPE SIZE 12.7 12.7 GAS SIDE 1/2" 1/2" STANDARD PIPE LENGTH MAXIMUM PIPE LENGTH INSTALLATION...

  • Page 7: Dimensions

    R410A WALL MOUNTED type INVERTER 2 . DIMENSIONS...
  • Page 8 D I M E N S I O N S Models : ASU15RLQ / AOU15RLQ ASU18RLQ / AOU18RLQ unit : inch (mm) INDOOR UNIT 9-1/16 (230) 31-1/8 (790) OUTDOOR UNIT 20 (508) 13/16 (20) 21-1/4 (540) 4-15/16 (125) 2-5/8 11-13/16...

  • Page 9: Refrigerant System Diagram

    R410A WALL MOUNTED type INVERTER 3 . REFRIGERANT SYSTEM DIAGRAM...
  • Page 10 R E F R I G E R A N T S Y S T E M D I A G R A M Models : ASU15RLQ / AOU15RLQ ASU18RLQ/ AOU18RLQ Heat exchanger 3-Way ( INDOOR ) valve Muffler 2-Way...

  • Page 11: Circuit Diagram

    R410A WALL MOUNTED type INVERTER 4 . CIRCUIT DIAGRAM...
  • Page 12 CI R CUI T DI AG RAM Models : ASU15RLQ / AOU15RLQ ASU18RLQ AOU18RLQ CONTROL BOARD WHITE WHITE YELLOW WHITE INDOOR UNIT YELLOW CN201 BLUE BLUE WHITE SWITCH WHITE WHITE WHITE WHITE WHITE WHITE WHITE ORANGE YELLOW STEP MOTOR PINK...

  • Page 13: Description Of Each Control Operation

    R410A WALL MOUNTED type INVERTER 5 . DESCRIPTION OF EACH CONTROL OPERATION...

  • Page 14: Cooling Operation

    ( Table 1 : Compressor Frequency Range ) minimum maximum maximum frequency frequency frequency ASU15RLQ 18Hz 70Hz 90Hz ASU18RLQ 18Hz 70Hz 90Hz ( Fig. 1 : Limit of Maximum Frequency based on Outdoor Temperature ) Outside air Outside air Quiet temperature temperature 15/18RLQ...

  • Page 15: Heating Operation

    ( Table 2 : Compressor Frequency Range ) minimum maximum frequency frequency ASU15RLQ 18Hz 119Hz ASU18RLQ 18Hz 119Hz ( Fig.2 : Limit of Maximum Frequency based on Outdoor Temperature ) Outside air Outside air Quiet temperature temperature...

  • Page 16: Dry Operation

    Table 3. However, after the compressor is driven, the indoor unit shall run at operation frequency of 58Hz, for a minute. ( Table 3 : Compressor frequency ) Operating frequency ASU15RLQ 24Hz ASU18RLQ 24Hz ( Fig.3 : Compressor Control based on Room Temperature ) room room temperature temperature compressor ON Ts+3°F(1.5°C)

  • Page 17: Auto Changeover Operation

    4. AUTO CHANGEOVER OPERATION When the air conditioner is set to the AUTO mode by remote control, operation starts in the optimum mode from among the HEATING, COOLING, DRY and MONITORING modes. During operation, the optimum mode is automatically switched in accordance with temperature changes. The temperature can be set between 64°F(18°C) and 88°F(30°C) in 2°F(1°C) steps.

  • Page 18: Indoor Fan Control

    5. INDOOR FAN CONTROL (1).Fan speed ( Table 5 : Indoor Fan Speed ) ASU15/18RLQ Operation mode Air flow mode Speed (rpm) Heating 1,560 1,490 1,370 1,170 Quiet Cool air prevention S-Lo Cooling 1,560 1,320 1,090 Quiet (2).FAN OPERATION The airflow can be switched in 5 steps such as AUTO, QUIET, LOW, MED, HIGH, while the indoor fan only runs.
  • Page 19 (3).COOLING OPERATION Switch the airflow [AUTO], and the (Fig.6) indoor fan motor will run according airflow change - over ( Cooling:AUTO ) to a room temperature, as shown in When the room Figure 6. temperature rises On the other hand, if switched in HIGH mode +5°F(+2.5°C) [HIGH]...

  • Page 20: Outdoor Fan Control

    6. OUTDOOR FAN CONTROL (1). Fan Speed ( Table 6 : Outdoor fan speed ) (rpm) ZONE Cooling Heating ASU15/18RLQ 860/820/670/500 400~150 400~150 820/750/670/450 280~150 280~150 Refer to Fig1. (2). Fan Speed * It runs at 500(A-D ZONE)/200(E,F ZONE) rpm for 20/60 seconds after starting up the outdoor fan. * The outdoor fan speed mentioned avobe depends on the compressor frequency.

  • Page 21: Louver Control

    7. LOUVER CONTROL (1). VERTICAL LOUVER CONTROL (Function Range) Each time the button is pressed, the air direction range will change as follow: (Fig 9: Air Direction Range) (Operation Range) Cooling / Dry mode Heating mode Fan mode Use the air direction adjustments within the ranges shown above. The vertical airflow direction is set automatically as shown, in accordance with the type of operation selected.

  • Page 22: Compressor Control

    8. COMPRESSOR CONTROL (1). OPEARTION FREQUENCY RANGE The operation frequency of the compressor is different based on the operation mode as shown in the table 8. (Table 8 : Compressor Operation Frequency Range) Cooling Heating ASU15/18RLQ 18Hz 90Hz 18Hz 119Hz 24Hz (2).

  • Page 23: Timer Operation Control

    9. TIMER OPEARTION CONTROL The table 9 shows the available timer setting based on the product model. (Table 9 : Timer Setting) ON TIMER / OFF TIMER PROGRAM TIMER SLEEP TIMER ASU15/18RLQ (1). OPEARTION FREQUENCY RANGE OFF timer : When the clock reaches the set time, the air conditioner will be turned off. Operation mode Stop mode Set time of timer...
  • Page 24 (3). SLEEP TIMER If the sleep is set, the room temperature is monitored and the operation is stopped automatically. If the operation mode or the set temperature is change after the sleep timer is set, the operation is continued according to the changed setting of the sleep timer from that time ON. In the cooling operation mode When the sleep timer is set, the setting temperature is increased 2°F(1°C).

  • Page 25: Electronic Expansion Valve Control

    10. ELECTRONIC EXPANSION VALVE CONTROL The most proper opening of the electronic expansion valve is calculated and controlled under the present operating condition based on the following values. The compressor frequency, the temperatures detected by the discharge temperature sensor, the indoor heat exchanger sensor, the outdoor heat exchanger sensor, and the outdoor temperature sensor.

  • Page 26: Manual Auto Operation (Indoor Unit Body Operation)

    (It takes 33 minutes to complete the AIR CLEANING operation.) (Table 12 : COIL-DRY or AIR-CLEAN Operating Functions) Louver Compressor Main Unit Indoor Fan Speed Position Indication Frequency ASU15RLQ 900rpm 480rpm 36Hz COIL-DRY or AIR-CLEAN indication : ON ASU18RLQ Other indication : OFF 900rpm 480rpm 36Hz 05-13...

  • Page 27: Defrost Operation Control

    19. DEFROST OPERATION CONTROL (1). CONDITION OF STARTING THE DEFROST OPERATION The defrost operation starts when the outdoor heat exchanger temperature sensor detects the temperature lower than the values shown in Table 13. (Table 13 : Condition of starting Defrost Operation) Compressor operating time time defrosting Less than 20 minutes 20 to 60 minutes 60 minutes to 4 hours...
  • Page 28 Defrost Flow Chart The defrosting shall proceed by the integrating operation time and outdoor heat exchanger temperature as follows. Heating operation start : Compressor ON (Not defrosted for 10 minutes) (In case of 1st defrost) (In case of 2nd and later defrost) Compressor integrating Compressor integrating Compressor integrating...

  • Page 29: Off Defrost Operation Control

    20. OFF DEFROST OPEARTION CONTROL When operation stops in the [Heating operation] mode, if frost is adhered to the outdoor unit heat exchanger, the defrost operation will proceed automatically. In this time, if indoor unit operation lamp flashes slowly (7 sec ON / 2 sec OFF), the outdoor unit will allow the heat exchanger to defrost, and then stop.

  • Page 30: Various Protections

    LED starts blinking. (Table 15 : Discharge Temperature Over Rise Prevension Control / Release Temperature) Temperature Temperature Temperature ASU15RLQ 219°F(104°C) 214°F(101°C) 230°F(110°C) ASU18RLQ 219°F(104°C) 214°F(101°C) 230°F(110°C) Temperature Temperature Temperature *Outside temperature is E/F zone with ASU15RLQ Ta+165°F (74°C)
  • Page 31 (Table 18 : Cooling Pressure Over Rise Protection Function Temperature) Temperature ASU15RLQ 153°F(67°C) ASU18RLQ 153°F(67°C) (5). HIGH TEMPERATURE RELEASE CONTROL ( HEATING MODE ) On heating mode, the compressor frequency is controlled as following based on the detection value of the indoor heat exchanger temperature sensor.

  • Page 32: Refrigerant Caution -R410A

    R410A WALL MOUNTED type INVERTER 6 . REFRIGERANT CAUTION -R410A-...

  • Page 33: R410A Tools

    1. R410A TOOLS This air conditioner used R410A. TOOLS AND EQUIPMENT (R410A) For installation and servicing, it is necessary to prepare the tools and machines that are different from the previous Pressure control and Gas charging refrigerant. Circuit switching Safety charger Fig.4-13 Mark shows the exclusive use for R410A.

  • Page 34: Precaution For Installation

    2. PRECAUTION FOR INSTALLATION Precaution for installation Pipe diameter, recommended material and wall thickness Nominal diameter 1/4" 3/8" 1/2" 5/8" 3/4" 7/8" 1" 1 1/8" 1 1/4" 1 3/8" 1 1/2" (in) Outside diameter 6.35 9.52 12.70 15.88 19.05 22.22 25.40 28.58 31.75 34.92...
  • Page 35 Be careful not to mix moisture and contamination into the pipe Moisture contamination in the pipe is a cause of trouble. Air purge Always use a vacuum pump to purge air. Refrigerant charge Don't charge from the phase side. Do it always from the liquid phase side.

  • Page 36: Precaution For Servicing

    3. PRECAUTION FOR SERVICING Feature 1 Refrigerant oil is different from before. Precaution on Tools Refrigerant oil for Different point from New Refrigerant previous one Use the gauge manifold and charge hose Synthetic oil Absorbent character for New Refrigerant(HFC), which shall is high.

  • Page 37: New Refrigerant R410A

    4. NEW REFRIGERANT R410A What is HFC ? Phase-out schedule of HCFC according to Montreal protocol (HCFC consumption of 1989) + 100% = (CFC consumption of 1989) x 2.8% total abolition only service use started control 0.5% 1996 2000 2004 2010 2015 2020...
  • Page 38 Ozone Layer depleting mechanism sunbeam Ozone CFCl What is CFC and HCFC? CFC : Chloro-Fluoro-Carbon High ODP( ozone depletion potential ) chemical compound, including chlorine. (ODP:0.6-1.0) For example : R12 (for refrigerator and car air-conditioner) HCFC : Hydro-Chloro-Fluoro-Carbon Low ODP chemical compound, including chlorine and hydrogen. (ODP:0.02-01) For example : R22 (for air-conditioner) : Hydro-Fluoro-Carbon...
  • Page 39 Summary of R407C and R410A characteristics R407C R410A higher system similar pressure as R22 performance (possible to design Advantage Near-Azeotropic large equipment) refrigerant 1.6 times higher Zeotropic refrigerant pressure than R22 Disadvantage (handle with care) (difficult to design against pressure resistance) Large Air-Conditioners Suitable for Small Air-Conditioners...

  • Page 40: Defference From Conventional Model(R22) And Precautions

    5. DEFFERENCE FROM CONVENTIONAL MODEL (R22) AND PRECAUTIONS • Use new synthetic oils such as ester because HFC series refrigerant has less solubility with mineral oils conventionally used for R22. • As these new synthetic oils are easily influenced by moisture and dusts, they must be treated more care- fully than the conventional lubricating oils.

  • Page 41: Trouble Shooting

    R410A WALL MOUNTED type INVERTER 7 . TROUBLE SHOOTING 1. When the unit does not operate at all (Operation lamp and Timer lamp do not light up) 2. Self Diagnosis Function (Either Operation lamp or Timer lamp is blinking) * How to operate the self-diagnosis function * Self- diagnosis table and Check points 3.
  • Page 42 Does not operate at all (Operation Lamp and Timer Lamp do not light up) [Check Point] (1) Is the input power voltage from the exclusive circuit AC outlet normal? (2) Is the AC plug inserted to the AC outlet securely and not loose? Does not connected cable do wrong wiring? (4) Check if each connector is inserted securely.

  • Page 43: Self Diagnosis Function

    SELF-DIAGNOSIS FUNCTION This function memorizes the self-diagnosis function (lamp display) in the in door control P.C.Board when trouble occurs. (The memory contents are not destroyed even when the power cord is unplugged from the AC outlet.) The self-diagnosis function (lamp display) can also be switched between major classification display and minor classification display and precise diagnosis can be made.
  • Page 44 07-03...
  • Page 45 07-04...
  • Page 46 07-05...
  • Page 47 07-06...
  • Page 48 Serial Signal Receiving Error [Check Point] Check which has a cause of error, either Indoor unit or Outdoor unit. * Remove indoor unit front panel and cable xlampers and keep the terminal block clear so that it can be measured with a meter. * Remove AC power and reset the power, and press Test Operation switch on remote control.

  • Page 50: Trouble Shooting Method

    Trouble Shooting of Refrigerant Cycle [Diagnosis Table for Defective Component] : Item of most possible cause Cooling High Compressor Discharge IPM Protection Pressure Location error Temperature Error Protection Refrigerant leak Compressor failure(*) EEV failure (*) Thermistor failure (*) (*) Trouble Shooting Method (1) Checking method of the compressor failure Insert the AC plug and start up the cooling operation.

  • Page 51: Appending Data

    R410A WALL MOUNTED type INVERTER 8 . APPENDING DATA 1. Jumper setting of Indoor unit and Outdoor unit 2. Outdoor unit Pressure Value and Total Electric Current Curve 3. Thermistor Resistance Values 4. Capacity/Input data...
  • Page 52 JP (Jumper) Setting [Indoor Unit] ASU15/18RLQ - Remote control custom code When multiple number of indoor units are installed in the same room, erroneous receipt of the signal can be avoided by setting up the remote control custom code separately. To set up the remote control custom code, always set up the same code on both indoor unit PCB and remote control PCB.
  • Page 53 Outdoor Unit Low Pressure Value and Outdoor Total Electric Current Curve (Cooling) Model Name : ASU15RLQ [Condition] Ambient Indoor / Outdoor - Same temperature temperature Refrigerant Standard amount amount Piping 7.5m (Height difference 1m) length Power 60Hz - 230V voltage Operation TEST mode (Cooling), Hi Fan, Horizontal direction, Front air flow condition...
  • Page 54 Outdoor Unit High Pressure Value and Outdoor Total Electric Current Curve (Heating) Model Name : ASU15RLQ [Condition] Ambient Indoor 15 - 23degC, Outdoor 2 - 12degC temperature Refrigerant Standard amount amount Piping 7.5m (Height difference 1m) length Power 60Hz - 230V voltage Operation TEST mode (Heating), Hi Fan, Lower direction, Front air flow...
  • Page 55 Outdoor Unit Low Pressure Value and Outdoor Total Electric Current Curve (Cooling) Model Name : ASU18RLQ [Condition] Ambient Indoor / Outdoor - Same temperature temperature Refrigerant Standard amount amount Piping 7.5m (Height difference 1m) length Power 60Hz - 230V voltage...
  • Page 56 1. Operate on Heating mode, and press TEST button of remote control. 2. Operate continuously for 30 minutes. (After 60 minutes of operation, Test mode is released automatically.) (1) Indoor/Outdoor Temperature - Outdoor High Pressure Curve ASU18RLQ Indoor inlet temp :59°F(15°C) Indoor inlet temp :68°F(20°C) Indoor inlet temp :73°F(23°C)

  • Page 57: Thermistor Resistance Values

    Thermistor resistance values Room temperature thermistor Indoor heat exchanger thermistor Characteristics of room temperature thermistor Temp °F(°C) Resistance k Voltage (V) Temp °F(°C) Resistance k Voltage (V) 40.00 32.00 (0.00) 33.62 1.15 32.00 (0.00) 176.03 1.10 35.00 41.00 (5.00) 25.93 1.39 41.00 (5.00)

  • Page 58: Capacity/Input Data

    ASU15RLQ Capacity/Input data Heating <Capacity> Maximum 160% Indoor DB : 21.10 C operation Maximum operation 150% (Heating overload protection) 140% 130% 120% Without Frost 110% Rated operation 100% Maximum operation Current release works Without Frost With Frost Outdoor DB( C) <...
  • Page 59 Cooling <Capacity> 150% Indoor : 26.67/19.44 C 140% 130% 120% 110% 100% Outdoor DB( C) < Input > 120% Indoor : 26.67/19.44 C 110% 100% Outdoor DB( C) *Both capacity and input change largely when temperature is 10 or less degrees C, as outdoor fan speed is decreased due to low ambient temperature cooling control.
  • Page 60 ASU18RLQ Capacity/Input data Heating <Capacity> Maximum operation Current release works 140% IndoorDB:70 F 130% 120% Without Frost 110% 100% Current release works With Frost Rated operation Without Frost Outdoor DB( F) <Input> 180% IndoorDB:70 F 170% 160% Without Frost Maximum operation...
  • Page 61 Cooling <Capacity> 150% Indoor:80/65 140% 130% 120% 110% 100% Outdoor DB( F) <Input> 120% Indoor:80/65 110% 100% Outdoor DB( F) Both capacity and input decrease when temperature is 66 or less degrees F, for compressor frequency restrictions operate. Both capacity and input decrease when temperature is 104 or more degrees F, as compressor speed is decreased due to current release protection.

  • Page 62: Replacement Parts

    R410A WALL MOUNTED type INVERTER 9 . REPLACEMENT PARTS...
  • Page 63 RE P L A C E M E N T P ART S Models : ASU15RLQ ASU18RLQ 09-01...
  • Page 64 RE P L A C E M E N T P ART S Models : ASU15RLQ ASU18RLQ 09-02...
  • Page 65 RE P L A C E M E N T P ART S Models : AOU15RLQ AOU18RLQ 09-03...
  • Page 66 RE P L A C E M E N T P ART S PROCESS ATTACHMENT OF INVERTER ASSY INVERTER ASSY Tap tight screw (SEPARATER) (TERMINAL BRACKET) Do not run up the terminal board mounting metal on 2 location of hook. THERMISTOR (OUT TEMP) is passed here.
  • Page 67 RE P L A C E M E N T P ART S PROCESS The leads are connected with INVERTER ASSY MOTOR LEAD THERMISTOR ASSY (COND, DIS) THERMISTOR (OUT TEMP) SOLENOID LEAD COIL (EXP VLV) LEAD COMP LEAD WIRE CLAMPER REACTOR LEAD Cross Run the wire in front of bytly rubber sheet.
  • Page 68 RE P L A C E M E N T P ART S PROCESS The leads are connected with INVERTER ASSY (TERMINAL COVER) (BINDER) 0~10mm COMP LEAD is passed TERMINAL COVER the under. PCB side COMP side 09-06...
  • Page 69 RE P L A C E M E N T P ART S PROCESS Fixing of Thermistor lead and motor lead. THERMISTOR ASSY (SUC/DIS) THERMISTOR (OUT TEMP) MOTOR LEAD COIL(EXP VLV) B - B 120~140mm 200~230mm E - E 160~190mm 190~220mm 09-07...

  • Page 70: Installation Manual

    R410A WALL MOUNTED type INVERTER 10 . INSTALLATION MANUAL...
  • Page 73 1116, Suenaga, Takatsu-ku, Kawasaki 213-8502, Japan GS06212006 JUN 2006 Printed in Japan...

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