Daikin FCQ18PVJU Service Manual
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Daikin FCQ18PVJU Service Manual

Split system air conditioners skyair inverter r-410a heat pump 60hz p series
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SiUS28 - 902_a
Split System Air Conditioners
SkyAir Inverter
R-410A Heat Pump 60Hz
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Summary of Contents for Daikin FCQ18PVJU

  • Page 1 SiUS28 - 902_a Split System Air Conditioners SkyAir Inverter R-410A Heat Pump 60Hz P Series...

  • Page 2: Table Of Contents

    SiUS28-902_a SkyAir Inverter P Series R-410A Heat Pump 60Hz 1. Introduction ..................... v 1.1 Safety Considerations for Repair ............. v 1.2 Safety Considerations for Users ............. vi Part 1 General Information............1 1. Model Names and Power Supply............2 2. External Appearance ................3 2.1 Indoor Units....................
  • Page 3 SiUS28-902_a 3.6 Stopping Operation ................27 3.7 Pressure Equalization Prior to Startup ........... 28 4. Protection Control .................29 4.1 High Pressure Protection Control ............29 4.2 Low Pressure Protection Control ............30 4.3 Discharge Pipe Protection Control ............31 4.4 Inverter Protection Control ..............32 5.
  • Page 4 SiUS28-902_a 3.9 “C4” Indoor Unit: Malfunction of Thermistor (R2T) for Heat Exchanger ..................96 3.10 “C5” Indoor Unit: Malfunction of Thermistor (R3T) for Gas Pipes ... 97 3.11 “C9” Indoor Unit: Malfunction of Thermistor (R1T) for Suction Air ..98 3.12 “CA”...
  • Page 5 SiUS28-902_a 4. Troubleshooting by Indication on the Centralized Remote Controller............143 4.1 “UE” Malfunction of Transmission between Centralized Remote Controller and Indoor Unit ........143 4.2 “M1” P.C.B. Defect ................145 4.3 “M8” Malfunction of Transmission between Optional Controllers for Centralized Control ........146 4.4 “MA”...

  • Page 6: Safety Considerations

    Safety Considerations SiUS28-902_a SAFETY CONSIDERATIONS • If refrigerant gas is discharged during repair work, do not touch the discharged refrigerant gas. The refrigerant gas may cause frostbite. Read these SAFETY CONSIDERATIONS carefully before • Use only pipes, flare nuts, tools, and other materials performing any repair work.
  • Page 7 SiUS28-902_a Safety Considerations electrical appliances as it may cause an electrical CAUTION shock or fire. • Do not repair the electrical components with wet • Use an exclusive power circuit for the equipment. hands. Working on the equipment with wet hands Insufficient circuit amperage capacity may cause an may cause an electrical shock.

  • Page 8: Part 1 General Information

    SiUS28-902_a Part 1 General Information 1. Model Names and Power Supply............2 2. External Appearance ................3 2.1 Indoor Units....................3 2.2 Outdoor Units ................... 3 General Information...

  • Page 9: Model Names And Power Supply

    SiUS28-902_a Model Names and Power Supply 1. Model Names and Power Supply Indoor Unit Outdoor Unit Power Supply FCQ18PVJU RZQ18PVJU Ceiling Mounted Cassette Type FCQ24PVJU RZQ24PVJU (Multi Flow) FCQ30PVJU RZQ30PVJU FHQ18PVJU RZQ18PVJU VJ : 1φ, 208~230V, 60Hz Ceiling Suspended Type...

  • Page 10: External Appearance

    External Appearance SiUS28-902_a 2. External Appearance Indoor Units Ceiling mounted cassette type (Multi flow) FCQ18PVJU FCQ24PVJU FCQ30PVJU Ceiling suspended type FHQ18PVJU FHQ24PVJU FHQ30PVJU Wall mounted type FAQ18PVJU FAQ24PVJU Outdoor Units RZQ18PVJU RZQ24PVJU RZQ30PVJU General Information...

  • Page 11: Part 2 Specifications

    SiUS28-902_a Part 2 Specifications 1. Specifications ..................5 1.1 FCQ ......................5 1.2 FHQ ......................6 1.3 FAQ......................7 Specifications...

  • Page 12: Specifications

    Specifications SiUS28-902_a 1. Specifications Ceiling Mounted Cassette Type (Multi flow) Indoor unit FCQ18PVJU FCQ24PVJU FCQ30PVJU Model Outdoor unit RZQ18PVJU RZQ24PVJU RZQ30PVJU Power supply 1 phase 60Hz 208-230V 1 phase 60Hz 208-230V 1 phase 60Hz 208-230V Cooling capacity ¹ Btu/h 18,000...

  • Page 13: Fhq

    SiUS28-902_a Specifications Ceiling Suspended Type Indoor unit FHQ18PVJU FHQ24PVJU FHQ30PVJU Model Outdoor unit RZQ18PVJU RZQ24PVJU RZQ30PVJU Power supply 1 phase 60Hz 208-230V 1 phase 60Hz 208-230V 1 phase 60Hz 208-230V Cooling capacity ¹ Btu/h 18,000 24,000 30,000 Heating capacity ² Btu/h 20,000 27,000...

  • Page 14: Faq

    Specifications SiUS28-902_a Wall Mounted Type Indoor unit FAQ18PVJU FAQ24PVJU Model Outdoor unit RZQ18PVJU RZQ24PVJU Power supply 1 phase 60Hz 208-230V 1 phase 60Hz 208-230V Cooling capacity ¹ Btu/h 18,000 24,000 Heating capacity ² Btu/h 20,000 26,000 Indoor unit FAQ18PVJU FAQ24PVJU Color White (3.0Y8.5/0.5) White (3.0Y8.5/0.5)

  • Page 15: Part 3 List Of Electrical And Functional Parts

    SiUS28-902_a Part 3 List of Electrical and Functional Parts 1. List of Electrical and Functional Parts .............9 1.1 Outdoor Units ................... 9 1.2 Indoor Units.................... 10 List of Electrical and Functional Parts...

  • Page 16: List Of Electrical And Functional Parts

    List of Electrical and Functional Parts SiUS28-902_a 1. List of Electrical and Functional Parts Outdoor Units Model Remark Item Name Symbol RZQ18 RZQ24 RZQ30 (P.C.B. terminal) PVJU PVJU PVJU Type 2YC63HXD#ED Compressor Inverter — 1.7kW Output Motor 0.07kW — Fan motor Overcurrent relay —...

  • Page 17: Indoor Units

    SiUS28-902_a List of Electrical and Functional Parts Indoor Units Model Parts Name Symbol Remark 18PVJU 24PVJU 30PVJU Wired Remote BRC1D71 Controller Remote Option Controller Wireless Remote BRC7C812 Controller 1φ90W 6P Fan Motor Thermal Protector 266°F : OFF 176°F : ON Capacitor, fan motor 5.0μF 450VAC Motors...

  • Page 18: Part 4 Refrigerant Circuit

    SiUS28-902_a Part 4 Refrigerant Circuit 1. Refrigerant Circuit .................12 1.1 RZQ18·24·30PVJU ................12 2. Functional Parts Layout ................14 2.1 RZQ18·30PVJU ..................14 Refrigerant Circuit...

  • Page 19: Refrigerant Circuit Part

    SiUS28-902_a Refrigerant Circuit 1. Refrigerant Circuit RZQ18·24·30PVJU No. in refrigerant Symbol Name Major Function system diagram Inverter compressor is operated on frequencies between 52 Hz and 177 Hz by using Inverter compressor (INV.) the inverter. 17 steps Since the system is of air heat exchanging type, the fan is operated at 8-step rotation Inverter fan speed by using the inverter.
  • Page 20 Refrigerant Circuit SiUS28-902_a S1NPH S1NPL S1PH C : 3D062238B Refrigerant Circuit...

  • Page 21: Functional Parts Layout

    SiUS28-902_a Functional Parts Layout 2. Functional Parts Layout RZQ18·30PVJU Overview 1P241839E Refrigerant Circuit...

  • Page 22: Part 5 Function

    SiUS28-902_a Part 5 Function 1. Operation Mode ..................16 2. Basic Control..................17 2.1 Normal Operation................... 17 2.2 Compressor PI Control ................18 2.3 Electronic Expansion Valve PI Control ..........19 2.4 Cooling Operation Fan Control .............. 20 3. Special Control..................21 3.1 Startup Control..................21 3.2 Oil Return Operation ................

  • Page 23: Operation Mode

    SiUS28-902_a Operation Mode 1. Operation Mode Operation in stop mode Indoor unit stop or Indoor unit thermostat ON thermostat OFF Malfunction/Standby Restart standby Pressure (Compressor stop) equalization prior to startup Malfunction/ Standby Indoor unit stop or thermostat OFF Startup control •...

  • Page 24: Basic Control

    Basic Control SiUS28-902_a 2. Basic Control Normal Operation  Cooling Operation Actuator Operation Remarks Used for high pressure protection control, low pressure protection control, discharge pipe Compressor Compressor PI control temperature protection control, and compressor operating frequency upper limit control with inverter protection control.

  • Page 25: Compressor Pi Control

    SiUS28-902_a Basic Control Compressor PI Control Compressor PI Control Carries out the compressor capacity PI control to maintain Te at constant during cooling operation and Tc at constant during heating operation to ensure stable unit performance. [Cooling operation] Controls compressor capacity to adjust Te to Te : Low pressure equivalent saturation temperature achieve target value (TeS).

  • Page 26: Electronic Expansion Valve Pi Control

    Basic Control SiUS28-902_a Electronic Expansion Valve PI Control Main Electronic Expansion Valve EV1 Control Carries out the electronic expansion valve (Y1E) PI control to maintain the evaporator outlet superheated degree (SH) at constant during heating operation to make maximum use of the outdoor unit heat exchanger (evaporator).

  • Page 27: Cooling Operation Fan Control

    SiUS28-902_a Basic Control Cooling Operation Fan Control In cooling operation with low outdoor air temperature, this control is used to provide the adequate amount of circulation air with liquid pressure secured by high pressure control using outdoor unit fan. Pc>450 psi Pc: HP pressure sensor detection value STEP 8 Pc<261 psi...

  • Page 28: Special Control

    Special Control SiUS28-902_a 3. Special Control Startup Control On activation, the following control is performed to lighten the load of the compressor with liquid refrigerant located at the compressor at startup. Also, the position of the four-way valve is defined. 3.1.1 Startup Control in Cooling Operation Actuator Operation...

  • Page 29: Oil Return Operation

    SiUS28-902_a Special Control Oil Return Operation Oil discharged by the compressor to the field piping is collected by the oil return operation. 3.2.1 Oil Return Operation in Cooling Operation [Conditions to start] The cooling oil-returning operation is started under the following conditions: ...
  • Page 30 Special Control SiUS28-902_a 3.2.2 Oil Return Operation in Heating Operation [Conditions to start] The heating oil-returning operation is started under the following conditions:  Integrated amount of displaced oil  Timer (After the power is turned on, integrated operating-time is 2 hours and subsequently every 8 hours.) In addition, the integrated amount of displaced oil is derived from Tc, Te, and the compressor load.

  • Page 31: Defrosting Operation

    SiUS28-902_a Special Control Defrosting Operation The defrost operation is performed to solve frost on the outdoor unit heat exchanger when heating, and the heating capacity is recovered. [Conditions to start] The defrost operation is started under the following conditions:  Outdoor heat exchanger heat transfer co-efficiency ...

  • Page 32: Pump-Down Residual Operation

    Special Control SiUS28-902_a Pump-down Residual Operation When activating the compressor, if the liquid refrigerant remains in the heat-exchanger, the liquid enters into the compressor and dilutes oil therein resulting in a decrease of lubricity. Therefore, the pump-down residual operation is performed to collect the refrigerant in the heat- exchanger when the compressor is down.

  • Page 33: Restart Standby

    SiUS28-902_a Special Control Restart Standby Restart is not possible to prevent frequent power-on/off and to equalize pressure in the refrigerant system. Actuator Operation Remarks ⎯ Compressor Ta>86°F: STEP 4 ⎯ Outdoor unit fan Ta≤86°F: OFF ⎯ Four-way valve Keep former condition. ⎯...

  • Page 34: Stopping Operation

    Special Control SiUS28-902_a Stopping Operation When the system is down the actuator stops/clears all operations. 3.6.1 When System is in Stop Mode Actuator Operation Compressor Outdoor unit fan Four-way valve Keep former condition. Main electronic expansion valve (EV1) 0 pls Subcooling electronic expansion valve (EV2) 0 pls Hot gas bypass valve (SVP)

  • Page 35: Pressure Equalization Prior To Startup

    SiUS28-902_a Special Control Pressure Equalization Prior to Startup Before activating the compressor, the activation load is lightened by equalization across the compressor. In addition, inverters turn on electricity and capacitors are charged. Actuator Operation Remarks ⎯ Compressor Cooling:OFF ⎯ Outdoor unit fan Heating:Ta>78.8°F;...

  • Page 36: Protection Control

    Protection Control SiUS28-902_a 4. Protection Control High Pressure Protection Control This high pressure protection control is used to prevent the activation of protection devices due to abnormal increase of high pressure and to protect compressors against the transient increase of high pressure. [In cooling operation] Pc >...

  • Page 37: Low Pressure Protection Control

    SiUS28-902_a Protection Control Low Pressure Protection Control This low pressure protection control is used to protect compressors against the transient decrease of low pressure. [In cooling operation] Low pressure not limited Pe: LP pressure sensor detection value < 36 psi >...

  • Page 38: Discharge Pipe Protection Control

    Protection Control SiUS28-902_a Discharge Pipe Protection Control This discharge pipe protection control is used to protect the compressor internal temperature against a malfunction or transient increase of discharge pipe temperature. [INV. compressor] HTdi :Value of INV. compressor discharge pipe temperature (Tdi) compensated with outdoor air temperature Tp : Value of compressor port temperature calculated by Tc and Te, and suction...

  • Page 39: Inverter Protection Control

    SiUS28-902_a Protection Control Inverter Protection Control Inverter current protection control and inverter fin temperature control are performed to prevent tripping due to a malfunction, or transient inverter overcurrent, and fin temperature increase. [Inverter overcurrent protection control] Not limited •Inverter current ≤ XA &...

  • Page 40: Other Control

    Other Control SiUS28-902_a 5. Other Control Heating Operation Prohibition Heating operation is prohibited above 82°FDB outdoor air temperature.Outline of Control (Indoor Unit) Drain Pump Control 1. The drain pump is controlled by the ON/OFF buttons (4 button (1) - (4) given in the figure below).

  • Page 41: Drain Pump Control

    SiUS28-902_a Other Control 5.2.3 When the Float Switch is Tripped During Heating Operation: During heating operation, if the float switch is not reset even after the 5 minutes operation, 5 seconds stop, 5 minutes operation cycle ends, operation continues until the switch is reset. 5.2.4 When the Float Switch is Tripped and “...

  • Page 42: Louver Control For Preventing Ceiling Dirt

    Other Control SiUS28-902_a Louver Control for Preventing Ceiling Dirt We have added a control feature that allows you to select the range of air direction and adjust it to prevent the ceiling surrounding the air discharge outlet of ceiling mounted cassette type units from being soiled.

  • Page 43: Operation Range Of Remote Controller Temperature Sensor

    SiUS28-902_a Other Control Operation Range of Remote Controller Temperature Sensor Room temperature is controlled by the remote controller temperature sensor and return-air temperature sensor (unit-mounted temperature sensor) on the indoor unit. When the remote controller temperature sensor is set to Not Used in a field setting, the unit can be controlled only by unit mounted temperature sensor (or remote sensor).
  • Page 44 Other Control SiUS28-902_a Function...
  • Page 45 SiUS28-902_a Other Control Heating When heating, hot air rises to the top of the room which results in a lower temperature close to the floor where occupants are. This can cause the thermostat to turn off the unit before the lower part of the room reaches set-point temperature.

  • Page 46: Freeze Prevention

    Other Control SiUS28-902_a Freeze Prevention Freeze When the temperature detected by the liquid pipe temperature thermistor (R2T) of the indoor unit heat exchanger drops too low, the unit enters freeze prevention operation in accordance Prevention by Off with the following conditions, and is also set in accordance with the conditions given below. Cycle (Indoor Unit) Conditions for starting freeze prevention: Temperature is 30°F or less for total of 40 min., or...

  • Page 47: View Of Operations Of Swing Flaps

    SiUS28-902_a Other Control View of Operations of Swing Flaps Swing flaps work as following. Flap control Swinging Level Level Level Hot-start from defrosting Setting the wind direction Level Level Level Swinging Level Level Level Defrosting Setting the wind direction Level Level Level Swinging...

  • Page 48: Part 6 Test Operation

    SiUS28-902_a Part 6 Test Operation 1. Test Operation ..................42 1.1 Procedure and Outline ................42 1.2 Operation when Power is Turned On............. 45 2. Outdoor Unit P.C.B. Layout ..............46 3. Field Setting ..................47 3.1 Field Setting from Remote Controller............. 47 3.2 Field Setting from Outdoor Unit .............

  • Page 49: Test Operation

    SiUS28-902_a Test Operation 1. Test Operation Procedure and Outline Follow the following procedure to conduct the initial test operation after installation. 1.1.1 Check Work Prior to Turn Power Supply On Is the power supply single-phase 208-230V / 60Hz? Check the below items. Have you finished piping to the drain? •...

  • Page 50: Check Operation

    Test Operation SiUS28-902_a 1.1.3 Check Operation * During check operation, position the front panel in full view so as to avoid incorrect readings.* Check operation is mandatory for normal unit operation. (When the check operation is not executed, alarm code " "...
  • Page 51 SiUS28-902_a Test Operation No power is supplied to the outdoor unit. Turn the power on for the outdoor unit. The shutoff valve of an outdoor unit is left Open the gas-side shutoff valve and the liquid-side shutoff valve. closed. If the right indoor unit piping and wiring are Make sure that the right indoor unit piping and wiring are properly not properly connected to the outdoor unit.

  • Page 52: Operation When Power Is Turned On

    Test Operation SiUS28-902_a Operation when Power is Turned On 1.2.1 When Turning On Power First Time The unit cannot be run for up to 12 minutes to automatically set the master power and address (indoor-outdoor address, etc.). Status Outdoor unit Test lamp H2P ..

  • Page 53: Outdoor Unit P.c.b. Layout

    SiUS28-902_a Outdoor Unit P.C.B. Layout 2. Outdoor Unit P.C.B. Layout Outdoor unit P.C.B. (2) Set mode display (LED) (A2P) H1P H2P H3P H4P H5P H6P H7P (3) Mode setting switch MODE RETURN TEST RESET (1) Service monitor (A1P) Connection terminal for transmission use F1 F2 F1 F2 TO IN / D TO OUT / D...

  • Page 54: Field Setting

    Field Setting SiUS28-902_a 3. Field Setting Field Setting from Remote Controller Individual functions of indoor unit can be changed from the remote controller. At the time of installation or after service inspection / repair, make the local setting in accordance with the following description.
  • Page 55 SiUS28-902_a Field Setting 3.1.2 Wireless Remote Controller - Indoor Unit BRC7C812 BRC7E83 BRC7E818 1. When in the normal mode, push the button for 4 seconds or more, and operation then enters the “field set mode.” 2. Select the desired “mode No.” with the button.

  • Page 56: Simplified Remote Controller

    Field Setting SiUS28-902_a 3.1.3 Simplified Remote Controller BRC2A71 BRC2A71 REMOTE CONTROLLER: NAME AND FUNCTION OF EACH SWITCH AND DISPLAY DISPLAY “ ” (UNDER CENTRALIZED ON/OFF BUTTON CONTROL) When this display shows, the system is UNDER Press the button and the system will start. Press the CENTRALIZED CONTROL.
  • Page 57 SiUS28-902_a Field Setting 3.1.4 Setting Contents and Code No. – VRV Unit Field Setting Contents and Code No. SECOND CODE NO. Note)3 Mode No. FIRST Description of Setting Note)2 CODE No. Approx. Approx. Ultra-Long-Life 10,000 5,000 Type Filter Contamination-Heavy/ hours hours Light (Setting for display time to clean air filter) (Sets display...
  • Page 58 Field Setting SiUS28-902_a 3.1.5 Applicable Range of Field Setting Ceiling mounted cassette Ceiling suspended type Wall mounted type Setting type (Multi flow) Mode No. Switch Setting Contents    Filter sign  Ultra long life filter sign — — (20) Remote controller ...

  • Page 59: Detailed Explanation Of Setting Modes

    SiUS28-902_a Field Setting 3.1.6 Detailed Explanation of Setting Modes Filter Sign Setting If switching the filter sign ON time, set as given in the table below. Set Time Filter Specs. Lighting interval of the filter sign Setting (hours) Setting Mode No. Position Switch No.
  • Page 60 Field Setting SiUS28-902_a Setting of Airflow Direction Adjustment Range Make the following air flow direction setting according to the respective purpose. Setting Table Mode No. First Code No. Second Code No. Setting Upward (Draft prevention) Standard 13 (23) Downward (Ceiling soiling prevention) 3.1.7 Setting of Operation Control Mode from Remote Controller (Local Setting)
  • Page 61 SiUS28-902_a Field Setting How to Select Whether operation by remote controller will be possible or not for turning on/off, controlling Operation Mode temperature or setting operation mode is selected and decided by the operation mode shown in the right column of the following table. Example ON by remote OFF by remote...

  • Page 62: Field Setting From Outdoor Unit

    Field Setting SiUS28-902_a Field Setting from Outdoor Unit 3.2.1 Setting by push-button switches The following settings are made by pushbutton switches on P.C.B. LED display (Factory setting) MODE RETURN TEST RESET There are the following three setting modes.  Setting mode 1 (H1P off) Initial status (when normal) : Also indicates during “abnormal”.
  • Page 63 SiUS28-902_a Field Setting a. “Setting mode 1” Normally, “Setting mode 1” is set. In case of other status, push MODE button (BS1) one time and set to “Setting mode 1”. Display for malfunction/preparing/test-run LED display example ∗ The current state is displayed. Setting (displaying) item Normal Malfunction...
  • Page 64 Field Setting SiUS28-902_a b. “Setting mode 2” Setting item Description Push and hold the MODE button (BS1) for 5 seconds and set to Indoor unit forced Allows forced operation of indoor unit fan while unit is “Setting mode 2”. fan H stopped.
  • Page 65 SiUS28-902_a Field Setting k: ON h: OFF l: Blink Setting item display Setting condition display C/H selection MODE TEST Demand Setting item noise Master Slave ∗ Factory set k h h h h h k ∗ Normal operation Indoor unit forced fan H k h h h h k h Indoor forced fan H...
  • Page 66 Field Setting SiUS28-902_a k: ON h: OFF l: Blink c. Monitor mode LED display Setting item Data display l h h h h h h To enter the monitor mode, push the Various settings See below MODE button (BS1) when in l h h h k h k “Setting mode 1”.

  • Page 67: Detail Of Setting Mode

    SiUS28-902_a Field Setting Detail of Setting Mode 3.3.1 Cool / Heat Mode Switching The Cool / Heat Mode switching is carried out by remote controller fitted to indoor unit. This setting is not required for normal operation. (Factory set) 3.3.2 Setting of Low Noise Operation and Demand Operation Setting of Low Noise Operation By setting the low noise operation input to the outdoor unit P.C.B., you can lower operating noise by 2-3 dB.
  • Page 68 Field Setting SiUS28-902_a Setting of Demand Operation By setting the demand input to the outdoor unit P.C.B., the power consumption of unit operation can be saved suppressing the compressor operating condition. [Demand setting] Setting Standard for upper limit of power consumption Demand setting 1 Approx.
  • Page 69 SiUS28-902_a Field Setting   : ON : OFF : Blink    Setting Setting Setting No. indication Setting No. indication Setting Setting contents indication (Initial setting) contents contents H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P External ...
  • Page 70 Field Setting SiUS28-902_a 3.3.3 Setting of Refrigerant Recovery Mode When carrying out the refrigerant collection on site, fully open the respective expansion valves of indoor and outdoor units Both the outdoor unit and the indoor unit cannot be operated at this time. [Operation procedure] ...
  • Page 71 SiUS28-902_a Field Setting 3.3.5 Check Operation To prevent any trouble in the period of installation at site, the system is provided with a test operation mode enabling checks for incorrect wiring, stop valve left closed, and automatic determination of of piping length. CHECK OPERATION FUNCTION LED display (H1P~H7P) ( BLINK...

  • Page 72: Part 7 Troubleshooting

    SiUS28-902_a Part 7 Troubleshooting 1. Symptom-based Troubleshooting ............67 2. Troubleshooting by Remote Controller ..........70 2.1 The INSPECTION / TEST Button ............70 2.2 Self-diagnosis by Wired Remote Controller ........... 71 2.3 Self-diagnosis by Wireless Remote Controller........72 2.4 Operation of the Remote Controller’s Inspection / Test Operation Button ................
  • Page 73 SiUS28-902_a 3.27 “JC” Outdoor Unit: Malfunction of Low Pressure Sensor ...... 119 3.28 “L1” Outdoor Unit: Malfunction of P.C.B..........121 3.29 “L4” Outdoor Unit: Malfunction of Inverter Radiating Fin Temperature Rise ..........122 3.30 “L5” Outdoor Unit: Inverter Compressor Abnormal....... 123 3.31 “L8”...

  • Page 74: Symptom-Based Troubleshooting

    Symptom-based Troubleshooting SiUS28-902_a 1. Symptom-based Troubleshooting Symptom Supposed Cause Countermeasure The system does not start operation at all. Blowout of fuse(s) Turn Off the power supply and then replace the fuse(s). Cutout of breaker(s) • If the knob of any breaker is in its OFF position, turn ON the power supply.
  • Page 75 SiUS28-902_a Symptom-based Troubleshooting Symptom Supposed Cause Countermeasure COOL-HEAT The remote controller displays This remote controller has no Use a remote controller with selection is "UNDER CENTRALIZED option to select cooling operation. option to select cooling operation. disabled. CONTROL". The remote controller displays COOL-HEAT selection is made Use the COOL-HEAT selection "UNDER CENTRALIZED...
  • Page 76 Symptom-based Troubleshooting SiUS28-902_a Symptom Supposed Cause Countermeasure 11 The system <Indoor unit> These are operating sounds of Normal operation. produces Immediately after turning ON the electronic expansion valve of This sound becomes low after a sounds. the power supply, indoor unit the indoor unit.

  • Page 77: Troubleshooting By Remote Controller

    SiUS28-902_a Troubleshooting by Remote Controller 2. Troubleshooting by Remote Controller The INSPECTION / TEST Button The following modes can be selected by using the [Inspection/Test Operation] button on the remote control. Depress the Inspection/Test Operation button for more than 4 seconds. Indoor unit settings can be made Service data can be obtained.

  • Page 78: Self-Diagnosis By Wired Remote Controller

    Troubleshooting by Remote Controller SiUS28-902_a Self-diagnosis by Wired Remote Controller Explanation If operation stops due to malfunction, the remote controller’s operation LED blinks, and the malfunction code is displayed. (Even if stop operation is carried out, malfunction contents are displayed when the inspection mode is entered.) The malfunction code enables you to tell what kind of malfunction caused operation to stop.

  • Page 79: Self-Diagnosis By Wireless Remote Controller

    SiUS28-902_a Troubleshooting by Remote Controller Self-diagnosis by Wireless Remote Controller In the Case of If equipment stops due to a malfunction, the operation indicating LED on the light reception section flashes. BRC7C Type The malfunction code can be determined by following the procedure described below. The BRC7E Type malfunction code is displayed when an operation error has occurred.
  • Page 80 Troubleshooting by Remote Controller SiUS28-902_a  The lower digit of the code changes as shown below when the UP and DOWN buttons are pressed. Troubleshooting...
  • Page 81 SiUS28-902_a Troubleshooting by Remote Controller Troubleshooting...

  • Page 82: Operation Of The Remote Controller's Inspection / Test Operation Button

    Troubleshooting by Remote Controller SiUS28-902_a Operation of the Remote Controller’s Inspection / Test Operation Button Unit Malfunction code Inspection Normal display (No display) Malfunction code blinks when a malfunction occurs. Inspection/test Push the button. operation Unit Example of capacity code display 0 7 1...

  • Page 83: Remote Controller Service Mode

    SiUS28-902_a Troubleshooting by Remote Controller Remote Controller Service Mode How to Enter the Service Mode Service Mode 1. Select the mode No. Set the desired mode No. with the button. Operation (For wireless remote controller, Mode 43 only can be set.) Method 2.
  • Page 84 Troubleshooting by Remote Controller SiUS28-902_a Mode Function Contents and operation method Remote controller display example Malfunction Display malfunction history. hysteresis display The history No. can be changed with the Unit 1 button. Malfunction code 2-U4 Malfunction code History No: 1 - 9 1: Latest Display of sensor Display various types of data.

  • Page 85: Remote Controller Self-Diagnosis Function

    SiUS28-902_a Troubleshooting by Remote Controller Remote Controller Self-Diagnosis Function The remote controller switches are equipped with a self-diagnosis function so that more appropriate maintenance can be carried out. If a malfunction occurs during operation, the operation lamp, malfunction code and display of malfunctioning unit No. let you know the contents and location of the malfunction.
  • Page 86 Troubleshooting by Remote Controller SiUS28-902_a k: ON h: OFF l: Blink Malfunction Operation Inspection Unit No. Malfunction contents Page code lamp display Referred Indoor Unit Error of external protection device P.C.B. defect, E PROM defect Malfunction of drain level control system (S1L) Fan motor (M1F) lock, overload Malfunction of louver motor (M1S) Malfunction of moving part of electronic expansion...
  • Page 87 SiUS28-902_a Troubleshooting by Remote Controller k: ON h: OFF l: Blink Malfunction Operation Inspection Unit No. Malfunction contents Page code lamp display Referred Outdoor Unit Malfunction of power unit — Malfunction of transmission between inverter and control P.C.B. Malfunction of inverter radiating fin temperature rise sensor System Low pressure drop due to refrigerant shortage or...
  • Page 88 Troubleshooting by Remote Controller SiUS28-902_a Malfunction code indication by outdoor unit P.C.B. <Monitor mode> Contents of malfunction Malfunction To enter the monitor mode, push the code MODE (BS1) button when in In-phase malfunction of DIII-Net Detection of DIII-Net “Setting mode 1”. Abnormal discharge pressure HPS activated Abnormal suction pressure...
  • Page 89 SiUS28-902_a Troubleshooting by Remote Controller k: ON h: OFF l:Blink Confirmation of malfunction 1 Confirmation of malfunction 2 Confirmation of malfunction 3 Confirmation of malfunction 4 Malfunction code H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P ∗1 ∗1 ∗1...
  • Page 90 Troubleshooting by Remote Controller SiUS28-902_a <Monitor mode> Contents of malfunction Malfunction To enter the monitor mode, push the code MODE (BS1) button when in Faulty temperature sensor of inverter Faulty thermistor of inverter fin “Setting mode 1”. radiation fin Refrigerant shortage Refrigerant shortage alarm Abnormal power supply voltage Insufficient Inverter voltage...
  • Page 91 SiUS28-902_a Troubleshooting by Remote Controller k: ON h: OFF l:Blink Confirmation of malfunction 1 Confirmation of malfunction 2 Confirmation of malfunction 3 Confirmation of malfunction 4 Malfunction code H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P ∗1 ∗1 Display of contents of...

  • Page 92: Troubleshooting By Indication On The Remote Controller

    Troubleshooting by Indication on the Remote Controller SiUS28-902_a 3. Troubleshooting by Indication on the Remote Controller “ ” Indoor Unit: Error of External Protection Device Remote Controller Display Applicable All indoor unit models Models Method of Malfunction Detection Malfunction Decision Conditions ...

  • Page 93: A1" Indoor Unit: P.c.b. Defect

    SiUS28-902_a Troubleshooting by Indication on the Remote Controller “ ” Indoor Unit: P.C.B. Defect Remote Controller Display Applicable All indoor unit models Models Method of Check data from E²PROM. Malfunction Detection Malfunction When data could not be correctly received from the E²PROM Decision E²PROM : Type of nonvolatile memory.

  • Page 94: A3" Indoor Unit: Malfunction Of Drain Level Control System (S1L)

    Troubleshooting by Indication on the Remote Controller SiUS28-902_a “ ” Indoor Unit: Malfunction of Drain Level Control System (S1L) Remote Controller Display Applicable FCQ, FHQ (Option), FAQ (Option) Models Method of Float switch OFF detection Malfunction Detection Malfunction When rise of water level is not a condition and the float switch goes OFF. Decision Conditions ...

  • Page 95: Troubleshooting

    SiUS28-902_a Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector or parts could be damaged. Is power supply 208~230V provided? Provide 208~230V power supply. A short The float circuit connector is switch is connected to...

  • Page 96: A6" Indoor Unit: Fan Motor (M1F) Lock, Overload

    Troubleshooting by Indication on the Remote Controller SiUS28-902_a “ ” Indoor Unit: Fan Motor (M1F) Lock, Overload Remote Controller Display Applicable All indoor unit models Models Method of Detection by failure of signal for detecting number of turns to come from the fan motor Malfunction Detection Malfunction...

  • Page 97: A7" Indoor Unit: Malfunction Of Louver Motor (M1S)

    SiUS28-902_a Troubleshooting by Indication on the Remote Controller “ ” Indoor Unit: Malfunction of Louver Motor (M1S) Remote Controller Display Applicable FCQ, FHQ, FAQ Models Method of Utilizes ON/OFF of the limit switch when the motor turns. Malfunction Detection Malfunction When ON/OFF of the microswitch for positioning cannot be reversed even though the louver Decision motor is energized for a specified amount of time (about 30 seconds).
  • Page 98 Troubleshooting by Indication on the Remote Controller SiUS28-902_a Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts could be damaged. Is power supply 208~230V provided? Provide 208~230V power supply. Indoor unit is a model equipped Replace the indoor unit P.C.B.

  • Page 99: A9" Indoor Unit: Malfunction Of Moving Part Of

    SiUS28-902_a Troubleshooting by Indication on the Remote Controller “ ” Indoor Unit: Malfunction of Moving Part of Electronic Expansion Valve (Y1E) Remote Controller Display Applicable All indoor unit models Models Method of Malfunction Detection Malfunction Decision Conditions  Malfunction of moving part of electronic expansion valve Supposed ...
  • Page 100 Troubleshooting by Indication on the Remote Controller SiUS28-902_a ∗1: Coil check method for the moving part of the electronic expansion valve Disconnect the electronic expansion valve from the P.C.B. and check the continuity between the connector pins. (Normal) Pin No. 1.

  • Page 101: Af" Indoor Unit: Drain Level Above Limit

    SiUS28-902_a Troubleshooting by Indication on the Remote Controller “ ” Indoor Unit: Drain Level above Limit Remote Controller Display Applicable Models Method of Water leakage is detected based on float switch ON/OFF operation while the compressor is in Malfunction non-operation. Detection Malfunction When the float switch changes from ON to OFF while the compressor is in non-operation.

  • Page 102: Aj" Indoor Unit: Malfunction Of Capacity Determination Device

    Troubleshooting by Indication on the Remote Controller SiUS28-902_a “ ” Indoor Unit: Malfunction of Capacity Determination Device Remote controller display Applicable All indoor unit models Models Method of Capacity is determined according to resistance of the capacity setting adaptor and the memory Malfunction inside the IC memory on the indoor unit P.C.B., and whether the value is normal or abnormal is determined.

  • Page 103: C4" Indoor Unit: Malfunction Of Thermistor (R2T) For Heat Exchanger

    SiUS28-902_a Troubleshooting by Indication on the Remote Controller “ ” Indoor Unit: Malfunction of Thermistor (R2T) for Heat Exchanger Remote Controller Display Applicable All indoor unit models Models Method of Malfunction detection is carried out by temperature detected by heat exchanger thermistor. Malfunction Detection Malfunction...

  • Page 104: C5" Indoor Unit: Malfunction Of Thermistor (R3T) For Gas Pipes

    Troubleshooting by Indication on the Remote Controller SiUS28-902_a 3.10 “ ” Indoor Unit: Malfunction of Thermistor (R3T) for Gas Pipes Remote Controller Display Applicable All indoor unit models Models Method of Malfunction detection is carried out by temperature detected by gas pipe thermistor. Malfunction Detection Malfunction...

  • Page 105: C9" Indoor Unit: Malfunction Of Thermistor (R1T) For Suction Air

    SiUS28-902_a Troubleshooting by Indication on the Remote Controller 3.11 “ ” Indoor Unit: Malfunction of Thermistor (R1T) for Suction Air Remote Controller Display Applicable AII indoor unit models Models Method of Malfunction detection is carried out by temperature detected by suction air temperature Malfunction thermistor.

  • Page 106: Ca" Indoor Unit: Malfunction Of Thermistor For Discharge Air

    Troubleshooting by Indication on the Remote Controller SiUS28-902_a 3.12 “ ” Indoor Unit: Malfunction of Thermistor for Discharge Air Remote Controller Display Applicable AII indoor unit models Models Method of Malfunction detection is carried out by temperature detected by discharge air temperature Malfunction thermistor.

  • Page 107: Cj" Indoor Unit: Malfunction Of Thermostat Sensor In Remote Controller

    SiUS28-902_a Troubleshooting by Indication on the Remote Controller 3.13 “ ” Indoor Unit: Malfunction of Thermostat Sensor in Remote Controller Remote Controller Display Applicable AII indoor unit models Models Method of Malfunction detection is carried out by temperature detected by remote controller air Malfunction temperature thermistor.

  • Page 108: E1" Outdoor Unit: P.c.b. Defect

    Troubleshooting by Indication on the Remote Controller SiUS28-902_a 3.14 “ ” Outdoor Unit: P.C.B. Defect Remote Controller Display Applicable RZQ18~30PVJU Models Method of Check data from E²PROM Malfunction Detection Malfunction When data could not be correctly received from the E²PROM Decision E²PROM : Type of nonvolatile memory.

  • Page 109: E3" Outdoor Unit: Actuation Of High Pressure Switch

    SiUS28-902_a Troubleshooting by Indication on the Remote Controller 3.15 “ ” Outdoor Unit: Actuation of High Pressure Switch Remote Controller Display Applicable RZQ18~30PVJU Models Method of Abnormality is detected when the contact of the high pressure protection switch opens. Malfunction Detection Malfunction Error is generated when the HPS activation count reaches the number specific to the operation...
  • Page 110 Troubleshooting by Indication on the Remote Controller SiUS28-902_a Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts could be damaged. Check for the points shown below. Is the stop valve open? Is the HPS connector properly connected to the main P.C.B.? Does the high pressure switch have continuity?

  • Page 111: E4" Outdoor Unit: Actuation Of Low Pressure Sensor

    SiUS28-902_a Troubleshooting by Indication on the Remote Controller 3.16 “ ” Outdoor Unit: Actuation of Low Pressure Sensor Remote Controller Display Applicable RZQ18~30PVJU Models Method of Abnormality is detected by the pressure value with the low pressure sensor. Malfunction Detection Malfunction Error is generated when the low pressure is dropped under specific pressure.
  • Page 112 Troubleshooting by Indication on the Remote Controller SiUS28-902_a Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts could be damaged. Is the stop Open the stop valve. valve open? Mount a pressure gauge on the low-pressure service port. Connect the Service Checker.

  • Page 113: E5" Inverter Compressor Motor Lock

    SiUS28-902_a Troubleshooting by Indication on the Remote Controller 3.17 “ ” Inverter Compressor Motor Lock Remote Controller Display Applicable RZQ18~30PVJU Models Method of Inverter P.C.B. takes the position signal from UVW line connected between the inverter and Malfunction compressor, and the malfunction is detected when any abnormality is observed in the phase- current waveform.
  • Page 114 Troubleshooting by Indication on the Remote Controller SiUS28-902_a Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts could be damaged. Check the installation conditions. Is the stop valve open? Open the stop valve. Is the UVW wiring Connect correctly.

  • Page 115: E7" Malfunction Of Outdoor Unit Fan Motor

    SiUS28-902_a Troubleshooting by Indication on the Remote Controller 3.18 “ ” Malfunction of Outdoor Unit Fan Motor Remote Controller Display Applicable RZQ18~30PVJU Models Method of Malfunction of fan motor system is detected according to the fan speed detected by hall IC Malfunction when the fan motor runs.

  • Page 116: E9" Outdoor Unit: Malfunction Of Moving Part Of

    Troubleshooting by Indication on the Remote Controller SiUS28-902_a 3.19 “ ” Outdoor Unit: Malfunction of Moving Part of Electronic Expansion Valve (Y1E) Remote Controller Display Applicable RZQ18~30PVJU Models Method of Check disconnection of connector Malfunction Check continuity of expansion valve coil Detection Malfunction Error is generated under no common power supply when the power is on.
  • Page 117 SiUS28-902_a Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts could be damaged. Turn power supply off, and turn power supply on again. Return to normal? External factor other than malfunction (for example, noise etc.).

  • Page 118: F3" Outdoor Unit: Abnormal Discharge Pipe Temperature

    Troubleshooting by Indication on the Remote Controller SiUS28-902_a 3.20 “ ” Outdoor Unit: Abnormal Discharge Pipe Temperature Remote Controller Display Applicable RZQ18~30PVJU Models Method of Abnormality is detected according to the temperature detected by the discharge pipe Malfunction temperature sensor. Detection Malfunction When the discharge pipe temperature rises to an abnormally high level...

  • Page 119: F6" Outdoor Unit: Refrigerant Overcharged

    SiUS28-902_a Troubleshooting by Indication on the Remote Controller 3.21 “ ” Outdoor Unit: Refrigerant Overcharged Remote Controller Display Applicable RZQ18~30PVJU Models Method of Excessive charging of refrigerant is detected by using the heat exchanging deicer temperature Malfunction during a check operation. Detection Malfunction When the amount of refrigerant, which is calculated by using the heat exchanging deicer...

  • Page 120: H9" Outdoor Unit: Malfunction Of Thermistor (R1T) For Outdoor Air

    Troubleshooting by Indication on the Remote Controller SiUS28-902_a 3.22 “ ” Outdoor Unit: Malfunction of Thermistor (R1T) for Outdoor Air Remote Controller Display Applicable RZQ18~30PVJU Models Method of Malfunction is detected from the temperature detected by the outdoor air thermistor. Malfunction Detection Malfunction...

  • Page 121: J3" Outdoor Unit: Malfunction Of Discharge Pipe Thermistor (R2T)

    SiUS28-902_a Troubleshooting by Indication on the Remote Controller 3.23 “ ” Outdoor Unit: Malfunction of Discharge Pipe Thermistor (R2T) Remote Controller Display Applicable RZQ18~30PVJU Models Method of Malfunction is detected from the temperature detected by discharge pipe temperature Malfunction thermistor. Detection Malfunction When a short circuit or an open circuit in the discharge pipe temperature thermistor is detected.

  • Page 122: J5" Outdoor Unit: Malfunction Of Thermistor (R3T, R5T) For Suction Pipe 1, 2

    Troubleshooting by Indication on the Remote Controller SiUS28-902_a 3.24 “ ” Outdoor Unit: Malfunction of Thermistor (R3T, R5T) for Suction Pipe 1, 2 Remote Controller Display Applicable RZQ18~30PVJU Models Method of Malfunction is detected from the temperature detected by the thermistor for suction pipe 1, 2. Malfunction Detection Malfunction...

  • Page 123: J6" Outdoor Unit: Malfunction Of Thermistor (R4T) For Outdoor Unit Heat Exchanger

    SiUS28-902_a Troubleshooting by Indication on the Remote Controller 3.25 “ ” Outdoor Unit: Malfunction of Thermistor (R4T) for Outdoor Unit Heat Exchanger Remote Controller Display Applicable RZQ18~30PVJU Models Method of Malfunction is detected from the temperature detected by the heat exchanger thermistor. Malfunction Detection Malfunction...

  • Page 124: Ja" Outdoor Unit: Malfunction Of High Pressure Sensor

    Troubleshooting by Indication on the Remote Controller SiUS28-902_a 3.26 “ ” Outdoor Unit: Malfunction of High Pressure Sensor Remote Controller Display Applicable RZQ18~30PVJU Models Method of Malfunction is detected from the pressure detected by the high pressure sensor. Malfunction Detection Malfunction When the high pressure sensor is short circuit or open circuit.

  • Page 125: Troubleshooting

    SiUS28-902_a Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts could be damaged. The high pressure sensor is connected to X17A of Connect the high pressure sensor outdoor unit P.C.B.

  • Page 126: Jc" Outdoor Unit: Malfunction Of Low Pressure Sensor

    Troubleshooting by Indication on the Remote Controller SiUS28-902_a 3.27 “ ” Outdoor Unit: Malfunction of Low Pressure Sensor Remote Controller Display Applicable RZQ18~30PVJU Models Method of Malfunction is detected from pressure detected by low pressure sensor. Malfunction Detection Malfunction When the low pressure sensor is short circuit or open circuit. Decision Conditions ...
  • Page 127 SiUS28-902_a Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts could be damaged. The low pressure sensor is connected to X18A (blue) Connect the low pressure sensor of outdoor unit P.C.B.

  • Page 128: L1" Outdoor Unit: Malfunction Of P.c.b

    Troubleshooting by Indication on the Remote Controller SiUS28-902_a 3.28 “ ” Outdoor Unit: Malfunction of P.C.B. Remote Controller Display Applicable RZQ18~30PVJU Models  Detect malfunctions by current value during waveform output before compressor startup. Method of  Detect malfunctions by current sensor value during synchronized operation at the time of Malfunction startup.

  • Page 129: L4" Outdoor Unit: Malfunction Of Inverter Radiating Fin Temperature Rise

    SiUS28-902_a Troubleshooting by Indication on the Remote Controller 3.29 “ ” Outdoor Unit: Malfunction of Inverter Radiating Fin Temperature Rise Remote Controller Display Applicable RZQ18~30PVJU Models Method of Fin temperature is detected by the thermistor of the radiation fin. Malfunction Detection Malfunction When the temperature of the inverter radiation fin increases above 180°F.

  • Page 130: L5" Outdoor Unit: Inverter Compressor Abnormal

    Troubleshooting by Indication on the Remote Controller SiUS28-902_a 3.30 “ ” Outdoor Unit: Inverter Compressor Abnormal Remote Controller Display Applicable RZQ18~30PVJU Models Method of Malfunction is detected from current flowing in the power transistor. Malfunction Detection Malfunction When an excessive current flows in the power transistor. Decision (Instantaneous overcurrent also causes activation.) Conditions...

  • Page 131: L8" Outdoor Unit: Inverter Current Abnormal

    SiUS28-902_a Troubleshooting by Indication on the Remote Controller 3.31 “ ” Outdoor Unit: Inverter Current Abnormal Remote Controller Display Applicable RZQ18~30PVJU Models Method of Malfunction is detected by current flowing in the power transistor. Malfunction Detection Malfunction When overload in the compressor is detected. Decision Conditions ...
  • Page 132 Troubleshooting by Indication on the Remote Controller SiUS28-902_a Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts could be damaged. Output current check secondary current of the inverter is higher than X16.8A, Compressor overload 260sec.

  • Page 133: L9" Outdoor Unit: Inverter Start Up Error

    SiUS28-902_a Troubleshooting by Indication on the Remote Controller 3.32 “ ” Outdoor Unit: Inverter Start up Error Remote Controller Display Applicable RZQ18~30PVJU Models Method of Malfunction is detected from current flowing in the power transistor. Malfunction Detection Malfunction When overload in the compressor is detected during startup Decision Conditions ...

  • Page 134: Lc" Outdoor Unit: Malfunction Of Transmission Between Inverter And Control P.c.b

    Troubleshooting by Indication on the Remote Controller SiUS28-902_a 3.33 “ ” Outdoor Unit: Malfunction of Transmission between Inverter and Control P.C.B. Remote Controller Display Applicable RZQ18~30PVJU Models Method of Check the communication state between inverter P.C.B. and control P.C.B. by micro-computer. Malfunction Detection Malfunction...

  • Page 135: P4" Outdoor Unit: Malfunction Of Inverter Radiating Fin Temperature Rise Sensor

    SiUS28-902_a Troubleshooting by Indication on the Remote Controller 3.34 “ ” Outdoor Unit: Malfunction of Inverter Radiating Fin Temperature Rise Sensor Remote Controller Display Applicable RZQ18~30PVJU Models Method of Resistance of radiation fin thermistor is detected when the compressor is not operating. Malfunction Detection Malfunction...

  • Page 136: U0" Outdoor Unit: Low Pressure Drop Due To Refrigerant Shortage Or Electronic Expansion Valve Failure

    Troubleshooting by Indication on the Remote Controller SiUS28-902_a 3.35 “ ” Outdoor Unit: Low Pressure Drop Due to Refrigerant Shortage or Electronic Expansion Valve Failure Remote Controller Display Applicable RZQ18~30PVJU Models Method of Short of gas malfunction is detected by discharge pipe temperature thermistor and low pressure Malfunction saturation temperature.
  • Page 137 SiUS28-902_a Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts could be damaged. Low pressure Cooling Out of gas, closing of stop is 36psi or less.

  • Page 138: U2" Power Supply Insufficient Or Instantaneous Failure

    Troubleshooting by Indication on the Remote Controller SiUS28-902_a 3.36 “ ” Power Supply Insufficient or Instantaneous Failure Remote Controller Display Applicable RZQ18~30PVJU Models Method of Detection of voltage of main circuit capacitor built in the inverter and power supply voltage. Malfunction Detection Malfunction...
  • Page 139 SiUS28-902_a Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts could be damaged. Is the power supply voltage Correct power supply. 208~230V ±10%? CHECK 4 ( P.158) Check the inverter power transistor.

  • Page 140: U3" Check Operation Not Executed

    Troubleshooting by Indication on the Remote Controller SiUS28-902_a 3.37 “ ” Check Operation not Executed Remote Controller Display Applicable RZQ18~30PVJU Models Method of Check operation is executed or not Malfunction Detection Malfunction Malfunction is decided when the unit starts operation without check operation. Decision Conditions ...

  • Page 141: U4" Malfunction Of Transmission Between Indoor Units And Outdoor Units

    SiUS28-902_a Troubleshooting by Indication on the Remote Controller 3.38 “ ” Malfunction of Transmission between Indoor Units and Outdoor Units Remote Controller Display Applicable AII indoor unit models Models RZQ18~30PVJU Method of Microcomputer checks if transmission between indoor and outdoor units is normal. Malfunction Detection Malfunction...
  • Page 142 Troubleshooting by Indication on the Remote Controller SiUS28-902_a Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts could be damaged. the indoor or outdoor unit P.C.B. been replaced, or has the indoor - outdoor Push and hold the RESET or outdoor - outdoor unit button on the master outdoor...

  • Page 143: U5" Malfunction Of Transmission Between

    SiUS28-902_a Troubleshooting by Indication on the Remote Controller 3.39 “ ” Malfunction of Transmission between Remote Controller and Indoor Unit Remote Controller Display Applicable AII indoor unit models Models Method of In case of controlling with 2-remote controller, check the system using microcomputer is signal Malfunction transmission between indoor unit and remote controller (main and sub) is normal.

  • Page 144: U8" Malfunction Of Transmission Between

    Troubleshooting by Indication on the Remote Controller SiUS28-902_a 3.40 “ ” Malfunction of Transmission between Main and Sub Remote Controllers Remote Controller Display Applicable AII indoor unit models Models Method of In case of controlling with 2-remote controller, check the system using the microcomputer if Malfunction signal transmission between indoor unit and remote controller (main and sub) is normal.

  • Page 145: Ue" Malfunction Of Transmission Between Centralized Remote Controller And Indoor Unit

    SiUS28-902_a Troubleshooting by Indication on the Remote Controller 3.41 “ ” Malfunction of Transmission between Centralized Remote Controller and Indoor Unit Remote Controller Display Applicable AII indoor unit models Centralized controller Models Method of Microcomputer checks if transmission between indoor unit and centralized remote controller is Malfunction normal.
  • Page 146 Troubleshooting by Indication on the Remote Controller SiUS28-902_a Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts could be damaged. an indoor unit once connected been removed Reset power supply or its address simultaneously for all optional changed? controllers for centralized...

  • Page 147: Uf" System Is Not Set Yet

    SiUS28-902_a Troubleshooting by Indication on the Remote Controller 3.42 “ ” System is not Set yet Remote Controller Display Applicable All models of indoor units Models RZQ18~30PVJU Method of On check operation, the number of indoor units in terms of transmission is not corresponding to Malfunction that of indoor units that have made changes in temperature.

  • Page 148: Uh" Malfunction Of System, Refrigerant System Address Undefined

    Troubleshooting by Indication on the Remote Controller SiUS28-902_a 3.43 “ ” Malfunction of System, Refrigerant System Address Undefined Remote Controller Display Applicable AII indoor unit models Models RZQ18~30PVJU Method of Malfunction Detection Malfunction Decision Conditions  Improper connection of transmission wiring between outdoor unit and outdoor unit outside Supposed Causes control adaptor...
  • Page 149 SiUS28-902_a Troubleshooting by Indication on the Remote Controller Troubleshooting Caution Be sure to turn off the power switch before connecting or disconnecting the connector, or parts could be damaged. Does electricity a malfunction being introduce for occur even after 12 the first time after minutes elapses from the Normal...

  • Page 150: Troubleshooting By Indication On

    Troubleshooting by Indication on the Centralized Remote Controller SiUS28-902_a 4. Troubleshooting by Indication on the Centralized Remote Controller “ ” Malfunction of Transmission between Centralized Remote Controller and Indoor Unit Remote Controller Display Applicable AII indoor unit models Models Centralized Remote Controller Method of Microcomputer checks if transmission between indoor unit and centralized remote controller is normal.
  • Page 151 SiUS28-902_a Troubleshooting by Indication on the Centralized Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts could be damaged. an indoor unit once connected been removed Reset power supply or its address simultaneously for all optional changed?

  • Page 152: M1" P.c.b. Defect

    Troubleshooting by Indication on the Centralized Remote Controller SiUS28-902_a “ ” P.C.B. Defect Remote Controller Display Applicable Centralized remote controller Models Method of Malfunction Detection Malfunction Decision Conditions  Defect of centralized remote controller P.C.B. Supposed Causes Troubleshooting Replace the centralized remote controller P.C.B. Troubleshooting...

  • Page 153: M8" Malfunction Of Transmission Between

    SiUS28-902_a Troubleshooting by Indication on the Centralized Remote Controller “ ” Malfunction of Transmission between Optional Controllers for Centralized Control Remote Controller Display Applicable Centralized remote controller Models Method of Malfunction Detection Malfunction Decision Conditions  Malfunction of transmission between optional controllers for centralized control Supposed ...

  • Page 154: Ma" Improper Combination Of Optional Controllers For Centralized Control

    Troubleshooting by Indication on the Centralized Remote Controller SiUS28-902_a “ ” Improper Combination of Optional Controllers for Centralized Control Remote Controller Display Applicable Centralized remote controller Models Method of Malfunction Detection Malfunction Decision Conditions  Improper combination of optional controllers for centralized control Supposed ...
  • Page 155 SiUS28-902_a Troubleshooting by Indication on the Centralized Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts could be damaged. the wiring adaptor for Cannot be used in electrical appendices combination with a wiring connected? adaptor for electrical...

  • Page 156: Mc" Address Duplication, Improper Setting

    Troubleshooting by Indication on the Centralized Remote Controller SiUS28-902_a “ ” Address Duplication, Improper Setting Remote Controller Display Applicable Centralized remote controller Models Method of Malfunction Detection Malfunction Decision Conditions  Address duplication of centralized remote controller Supposed Causes Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts could be damaged.

  • Page 157: Troubleshooting By Indication On The Unified On/Off Controller

    SiUS28-902_a Troubleshooting by Indication on the Unified ON/OFF Controller 5. Troubleshooting by Indication on the Unified ON/ OFF Controller Operation Lamp Blinks Remote Operation lamp blinks Controller Display Applicable All models of indoor units Models Unified ON/OFF controller Method of Malfunction Detection Malfunction...
  • Page 158 Troubleshooting by Indication on the Unified ON/OFF Controller SiUS28-902_a Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts could be damaged. Is a malfunction code displayed on the Diagnose the cause with the remote controller? air conditioner's failure diagnosis manual.

  • Page 159: Display "Under Host Computer Integrate Control" Blinks (Repeats Single Blink)

    SiUS28-902_a Troubleshooting by Indication on the Unified ON/OFF Controller Display “Under Host Computer Integrate Control” Blinks (Repeats Single Blink) Remote “under host computer integrated control” (Repeats single blink) Controller Display Applicable Unified ON/OFF controller Models Centralized controller, Schedule timer Method of Malfunction Detection Malfunction...
  • Page 160 Troubleshooting by Indication on the Unified ON/OFF Controller SiUS28-902_a Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution the connector, or parts could be damaged. Has a once connected optional controller for centralized Reset power supply control been disconnected simultaneously for all optional or its address...
  • Page 161 SiUS28-902_a Troubleshooting by Indication on the Unified ON/OFF Controller Is the wiring adaptor for Cannot be used in electrical appendices combination with a wiring connected? adaptor for electrical appendices. Remove the wiring adaptor for electrical appendices and reset the power supply for all optional controllers for centralized control simultaneously.

  • Page 162: Display "Under Host Computer Integrate Control" Blinks (Repeats Double Blink)

    Troubleshooting by Indication on the Unified ON/OFF Controller SiUS28-902_a Display “Under Host Computer Integrate Control” Blinks (Repeats Double Blink) Remote “Under host computer integrated control” (Repeats double blink) Controller Display Applicable Unified ON/OFF controller Models Method of Malfunction Detection Malfunction Decision Conditions ...
  • Page 163 SiUS28-902_a Troubleshooting by Indication on the Unified ON/OFF Controller CHECK 1 Check for causes of rise in high pressure Referring to the Fault Tree Analysis (FTA) shown below, probe the faulty points. ¬Check to be sure the stop valve is open. Stop valve closed Local High pipe...
  • Page 164 Troubleshooting by Indication on the Unified ON/OFF Controller SiUS28-902_a CHECK 2 Check for causes of drop in low pressure Referring to the Fault Tree Analysis (FTA) shown below, probe the faulty points. [In cooling] ←Are the electrical characteristics normal? Faulty low pressure sensor Faulty (See *1.) compressor...
  • Page 165 SiUS28-902_a Troubleshooting by Indication on the Unified ON/OFF Controller CHECK 3 Check for Fan Motor Connector (1) Turn the power supply off. (2) With the fan motor connector disconnected, measure the resistance between each pin, then make sure that the resistance is more than the value mentioned in the following table. 1 White Measurement point Judgement...

  • Page 166: Part 8 Appendix

    SiUS28-902_a Part 8 Appendix 1. Piping Diagrams .................160 1.1 Outdoor Unit ..................160 1.2 Indoor Unit ..................161 2. Wiring Diagrams for Reference ............162 2.1 Outdoor Unit ..................162 2.2 Indoor Unit ..................163 3. Thermistor Resistance / Temperature Characteristics .......166 4.

  • Page 167: Piping Diagrams

    SiUS28-902_a Piping Diagrams 1. Piping Diagrams Outdoor Unit RZQ18PVJU RZQ24PVJU RZQ30PVJU S1NPH S1NPL S1PH C : 3D062238B Appendix...

  • Page 168: Indoor Unit

    Piping Diagrams SiUS28-902_a Indoor Unit FCQ18P / 24P / 30PVJU FHQ18P / 24P / 30PVJU FAQ18P / 24PVJU C:4D024460D R1T : Thermistor for suction air temperature R2T : Thermistor for liquid line temperature R3T : Thermistor for gas line temperature (in) Capacity Liquid...

  • Page 169: Wiring Diagrams For Reference

    SiUS28-902_a Wiring Diagrams for Reference 2. Wiring Diagrams for Reference Outdoor Unit RZQ18PVJU RZQ24PVJU RZQ30PVJU Appendix...

  • Page 170: Indoor Unit

    Wiring Diagrams for Reference SiUS28-902_a Indoor Unit FCQ18PVJU FCQ24PVJU FCQ30PVJU Appendix...
  • Page 171 SiUS28-902_a Wiring Diagrams for Reference FHQ18PVJU FHQ24PVJU FHQ30PVJU Appendix...
  • Page 172 Wiring Diagrams for Reference SiUS28-902_a FAQ18PVJU FAQ24PVJU Appendix...

  • Page 173: Thermistor Resistance / Temperature Characteristics

    SiUS28-902_a Thermistor Resistance / Temperature Characteristics 3. Thermistor Resistance / Temperature Characteristics Indoor unit For air suction For liquid pipe For gas pipe Outdoor unit For outdoor air For suction 1 For Heat exchanger For Suction 2 T°F T°C kΩ T°F T°C kΩ...
  • Page 174 Thermistor Resistance / Temperature Characteristics SiUS28-902_a For discharge T°F T°C kΩ T°F T°C kΩ T°F T°C kΩ — — — 140.0 60.0 52.8 266.0 130.0 — — — 143.6 62.0 48.9 269.6 132.0 -6.0 1120.0 147.2 64.0 45.3 273.2 134.0 -4.0 1002.5 150.8...

  • Page 175: Pressure Sensor

    SiUS28-902_a Pressure Sensor 4. Pressure Sensor = 1.38V-0.69 : Detected Pressure [High Side] = 0.57V-0.28 : Detected Pressure [Low Side] : High pressure : Output Voltage [High Side] V Detected Pressure : Low pressure : Output Voltage [Low Side] V V : Voltage (V) High Pressure (P Low Pressure (P...

  • Page 176: Part 9 Precautions For New Refrigerant (R-410A)

    SiUS28-902_a Part 9 Precautions for New Refrigerant (R-410A) 1. Precautions for New Refrigerant (R-410A) ........170 1.1 Outline ....................170 1.2 Service Tools ..................172 Precautions for New Refrigerant (R-410A)

  • Page 177: Precautions For New Refrigerant (R-410A)

    SiUS28-902 Precautions for New Refrigerant (R-410A) 1. Precautions for New Refrigerant (R-410A) Outline 1.1.1 About Refrigerant R-410A  Characteristics of new refrigerant, R-410A 1. Performance Almost the same performance as R-22 and R-407C 2. Pressure Working pressure is approximately 1.4 times more than R-22 and R-407C. 3.
  • Page 178 Precautions for New Refrigerant (R-410A) SiUS28-902  Thermodynamic characteristic of R-410A Temperature Steam pressure Density Specific heat at constant Specific enthalpy Specific entropy (kPa) (kg/m pressure (kJ/kgK) (kJ/kg) (kJ/KgK) Liquid Vapor Liquid Vapor Liquid Vapor Liquid Vapor Liquid Vapor Precautions for New Refrigerant (R-410A)

  • Page 179: Service Tools

    SiUS28-902 Precautions for New Refrigerant (R-410A) Service Tools R-410A is used under higher working pressure, compared to previous refrigerants (R-22,R-407C). Furthermore, the refrigerating machine oil has been changed from Suniso oil to Ether oil, and if oil mixing is occurred, sludge results in the refrigerants and causes other problems. Therefore, gauge manifolds and charge hoses that are used with a previous refrigerant (R-22,R-407C) can not be used for products that use new refrigerants.
  • Page 180 Precautions for New Refrigerant (R-410A) SiUS28-902 1. Flaring tool Flare gauge  Specifications • Dimension A Unit:mm Tube O.D. -0.4 Nominal size Class-2 (R-410A) Class-1 (Conventional) 6.35 9.52 13.2 13.0 12.70 16.6 16.2 15.88 19.7 19.4 19.05 24.0 23.3  Differences •...
  • Page 181 SiUS28-902 Precautions for New Refrigerant (R-410A) 2. Torque wrench  Specifications • Dimension B Unit:mm Nominal size Class-1 Class-2 Previous No change in tightening torque No change in pipes of other sizes  Differences • Change of dimension B Only 1/2", 5/8" are extended For class-1: R-407C For class-2: R-410A Dimension B...
  • Page 182 Precautions for New Refrigerant (R-410A) SiUS28-902 4. Leak tester  Specifications • Hydrogen detecting type, etc. • Applicable refrigerants R-410A, R-407C, R-404A, R-507A, R-134a, etc.  Differences • Previous testers detected chlorine. Since HFCs do not contain chlorine, new tester detects hydrogen.
  • Page 183 SiUS28-902 Precautions for New Refrigerant (R-410A) 6. Gauge manifold for R-410A  Specifications • High pressure gauge 15 to 770 psi (-76 cmHg to 53 kg/cm • Low pressure gauge 15 to 550 psi (-76 cmHg to 38 kg/cm 1/4" → 5/16" (2min → 2.5min) •...
  • Page 184 • Measurement is based on weight to prevent change of mixing ratio during charging. Regarding purchasing of service tools, please contact following address. Daikin U.S. Corporation (Dallas Office) 1645 Wallace Dr, Ste 110 Carrollton, TX 75006 "Tel: 1-972-245-1510 FAX: 1-972-245-1038"...
  • Page 185 SiUS28-902 Precautions for New Refrigerant (R-410A) Precautions for New Refrigerant (R-410A)
  • Page 186 Daikin Industries, Ltd.’s products are manufactured for export to numerous countries throughout the world. Daikin Industries, Ltd. does not have control over which products are exported to and used in a particular country. Prior to purchase, please therefore confirm with your local authorized importer, distributor and/or retailer whether this product conforms tot he applicable standards, and is suitable for use, in the region where the product will be used.

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