Page 1 SiUS331708EA Service Manual RXSQ24/36/48/60TAVJU Heat Pump 60 Hz...
Page 2 SiUS331708EA RXSQ-TAVJU VRV LIFE Heat Pump Unit R-410A 60 Hz ED Reference Refer to Engineering Data for the details of specifications, option list, etc. Item Model ED No. FXFQ-T EDUS391400-F14 FXFQ-P EDUS391000-F1 FXZQ-TA EDUS391776-F9 FXZQ-M EDUS391300-F9 FXUQ-P EDUS391437-F15 FXEQ-P EDUS391533-F16 FXDQ-M EDUS39-600-F2 VRV indoor unit...
Page 3 SiUS331708EA Part 2 Refrigerant Circuit ..............7 1. Refrigerant Circuit ..................8 1.1 Outdoor Unit ....................8 1.2 Indoor Unit....................14 1.3 Outdoor-Air Processing Unit............... 16 2. Functional Parts Layout ................17 2.1 RXSQ24/36TAVJU..................17 2.2 RXSQ48TAVJU..................19 2.3 RXSQ60TAVJU..................21 Part 3 Remote Controller ...............
Page 4 SiUS331708EA 5. Other Control.....................58 5.1 Demand Operation ..................58 5.2 Heating Operation Prohibition ..............58 5.3 Gas Furnace Operation Prohibition............58 5.4 Gas Furnace Operation Startup Prohibition ..........58 6. Outline of Control (Indoor Unit) ..............59 6.1 Operation Flowchart ................... 59 6.2 Set Temperature and Control Temperature ..........
Page 5 SiUS331708EA 3. Test Operation ..................131 3.1 Check Work Prior to Turning Power Supply ON ........131 3.2 Turn Power ON ..................131 3.3 Test Operation..................132 3.4 Gas Furnace Test Operation..............135 3.5 Error Codes and Corresponding Measures..........136 3.6 When Turning ON Power First Time ............
Page 6 SiUS331708EA 4.23 Combination Abnormality (between Indoor Unit PCB and Fan PCB)..188 4.24 Blower Motor HP Mismatch..............189 4.25 Indoor Blower Does Not Have Required Parameters to Function .... 190 4.26 Remote Sensor Abnormality ..............191 4.27 Humidity Sensor System Abnormality ............192 4.28 Infrared Presence/Floor Sensor Error ............
Page 7 SiUS331708EA 4.66 Poor Centralized Controller Combination..........247 4.67 Address Duplication, Poor Setting............249 4.68 Operation Lamp Blinking ................251 4.69 Central Control Indicator Lamp Blinking (One blink) ........ 253 4.70 Central Control Indicator Lamp Blinking (Two blinks) ......256 5. Check ...................... 257 5.1 High Pressure Check ................
Page 8 Safety Cautions SiUS331708EA 1. Safety Cautions Be sure to read the following safety cautions before conducting repair work. After the repair work is complete, be sure to conduct a test operation to ensure that the equipment operates normally, and explain the cautions for operating the product to the customer. This manual is for the person in charge of maintenance and...
Page 9 SiUS331708EA Safety Cautions Warning Be sure to discharge the capacitor completely before conducting repair work. The step-up capacitor supplies high-voltage electricity to the electrical components of the outdoor unit. A charged capacitor may cause an electrical shock. Do not turn the air conditioner on or off by plugging in or unplugging the power cable.
Page 10 Safety Cautions SiUS331708EA Caution Be sure to conduct repair work with appropriate tools. The use of inappropriate tools may cause injury. Be sure to check that the refrigerating cycle section has cooled down enough before conducting repair work. Working on the unit when the refrigerating cycle section is hot may cause burns.
Page 11 SiUS331708EA Safety Cautions Warning Be sure to use the specified cable for wiring between the indoor and outdoor units. Make the connections securely and route the cable properly so that there is no force pulling the cable at the connection terminals. Improper connections may cause excessive heat generation or fire.
Page 12 Safety Cautions SiUS331708EA Caution Installation of a leakage breaker is necessary in some cases depending on the conditions of the installation site, to prevent electrical shocks. Do not install the equipment in a place where there is a possibility of combustible gas leaks.
Page 13 SiUS331708EA Icons Used 2. Icons Used The following icons are used to attract the attention of the reader to specific information. Icon Type of Description Information Warning A warning is used when there is danger of personal injury. Warning Caution A caution is used when there is danger that the reader, through incorrect manipulation, may damage equipment, lose data, get Caution...
Page 14: Table Of Contents
SiUS331708EA Part 1 General Information 1. Model Names of Indoor/Outdoor Units............2 1.1 Indoor Unit....................2 1.2 Air Treatment Equipment ................3 1.3 Outdoor Unit ....................3 2. External Appearance................... 4 2.1 Indoor Unit....................4 2.2 Air Treatment Equipment ................5 2.3 Outdoor Unit ....................
Page 15: Model Names Of Indoor/Outdoor Units
SiUS331708EA Model Names of Indoor/Outdoor Units 1. Model Names of Indoor/Outdoor Units Indoor Unit Capacity Range (ton) 1.25 Power Supply, Standard Capacity Index Ceiling Mounted Cassette — — — — — (Round Flow with Sensing) Type FXFQ Ceiling Mounted Cassette —...
Page 16: Air Treatment Equipment
Model Names of Indoor/Outdoor Units SiUS331708EA Air Treatment Equipment Outdoor-Air Processing Unit Power Supply, Series Model Name Standard FXMQ 48MF 72MF Energy Recovery Ventilator (VAM series) Power Supply, Series Model Name Standard 300G 470G 600G 1200G : 1 phase, 208/230 V, 60 Hz U(VJU) : Standard symbol Outdoor Unit Capacity Range...
Page 17: External Appearance
SiUS331708EA External Appearance 2. External Appearance Indoor Unit Ceiling mounted cassette (Round flow with sensing) type Ceiling mounted duct type (Middle and high static pressure) FXFQ-T FXMQ-PB Shown with BYCQ125B-W1 Ceiling mounted cassette (Round flow) type Ceiling suspended type FXFQ-P FXHQ-M Shown with BYCP125K-W1 VISTA™...
Page 18: Air Treatment Equipment
External Appearance SiUS331708EA Air Treatment Equipment Outdoor-air processing unit Energy recovery ventilator (VAM series) FXMQ-MF VAM-G Outdoor Unit RXSQ24/36/48TAVJU RXSQ60TAVJU 2/3/4 ton 5 ton General Information...
Page 19: Connection Ratio
Capacity index of the outdoor units Max. connection ratio Type Min. connection ratio Types of connected indoor units VRV indoor units Single outdoor units 130% Outdoor Unit Model Name RXSQ24TAVJU RXSQ36TAVJU RXSQ48TAVJU RXSQ60TAVJU Capacity Range 2 ton 3 ton 4 ton 5 ton Capacity Index Max.
Page 20 SiUS331708EA Part 2 Refrigerant Circuit 1. Refrigerant Circuit ..................8 1.1 Outdoor Unit ....................8 1.2 Indoor Unit....................14 1.3 Outdoor-Air Processing Unit............... 16 2. Functional Parts Layout ................17 2.1 RXSQ24/36TAVJU..................17 2.2 RXSQ48TAVJU..................19 2.3 RXSQ60TAVJU..................21 Refrigerant Circuit...
Page 21: Refrigerant Circuit Part
SiUS331708EA Refrigerant Circuit 1. Refrigerant Circuit Outdoor Unit 1.1.1 RXSQ24/36TAVJU No. in piping Symbol Name Function diagram Inverter compressor is operated on frequencies between 16 rps and 100.5 rps by using Inverter compressor the inverter. Because the system is of an air heat exchange type, the fan is operated at 8-step rotation Inverter fan speed by using the inverter.
Page 22 Refrigerant Circuit SiUS331708EA Refrigerant Circuit...
Page 23 SiUS331708EA Refrigerant Circuit 1.1.2 RXSQ48TAVJU No. in piping Symbol Name Function diagram Inverter compressor is operated on frequencies between 15 rps and 109 rps by using the Inverter compressor inverter. Because the system is of an air heat exchange type, the fan is operated at 8-step rotation Inverter fan speed by using the inverter.
Page 24 Refrigerant Circuit SiUS331708EA Refrigerant Circuit...
Page 25 SiUS331708EA Refrigerant Circuit 1.1.3 RXSQ60TAVJU No. in piping Symbol Name Function diagram Inverter compressor is operated on frequencies between 15 rps and 109 rps by using the Inverter compressor inverter. Because the system is of an air heat exchange type, the fan is operated at 8-step rotation Inverter fan speed by using the inverter.
Page 26 Refrigerant Circuit SiUS331708EA Refrigerant Circuit...
Page 27: Indoor Unit
SiUS331708EA Refrigerant Circuit Indoor Unit Symbol Except No. in piping Name Function FXMQ-PB, FXTQ-TA, diagram FXMQ-PB FXTQ-TA, CXTQ-TA CXTQ-TA Used for gas superheated degree control while Electronic expansion in cooling or subcooled degree control while in valve heating. Suction air thermistor R1T (∗1) Used for thermostat control.
Page 28 Refrigerant Circuit SiUS331708EA FXDQ-M FXMQ-PB Gas piping connection port Gas piping connection port Liquid piping connection port Indoor heat exchanger Filter Filter Liquid piping connection port Filter Filter C: 4D034245R Indoor heat exchanger C: 4D043864N FXTQ-TA CXTQ-TA Gas piping connection port Indoor heat exchanger Liquid piping connection port...
Page 29: Outdoor-Air Processing Unit
SiUS331708EA Refrigerant Circuit Outdoor-Air Processing Unit FXMQ48/72MFVJU Gas pipe connection port Heat exchanger Filter Capillary tube Distributor Solenoid valve Liquid pipe connection port Check valve Filter Filter Electronic expansion valve C: 4D018650D No. in Electric piping Name Function symbol diagram Used to control the flow rate of refrigerant, and make the Electronic expansion valve SH control (∗1) while in cooling.
Page 30: Functional Parts Layout
Functional Parts Layout SiUS331708EA 2. Functional Parts Layout RXSQ24/36TAVJU Top view Low pressure sensor (S1NPL) High pressure sensor (S1NPH) Thermistor (Suction pipe 2) (R5T) Front view Solenoid valve coil (Hot gas) (Y2S) Four way valve coil (Y1S) Solenoid valve coil (Unload circuit) (Y3S) Inverter fan...
Page 31 SiUS331708EA Functional Parts Layout Side view Four way valve (Y1S) Thermistor (Outdoor air) (R1T) Thermistor (Suction pipe 1) (R3T) Thermistor (Heat exchanger deicer) (R4T) C: 1P342997M Refrigerant Circuit...
Page 32: Rxsq48Tavju
Functional Parts Layout SiUS331708EA RXSQ48TAVJU Front view Four way valve (Y1S) Four way valve coil (Y1S) Low pressure sensor (S1NPL) Thermistor (Suction pipe 2) (R5T) Solenoid valve (Unload circuit) coil Thermistor (Discharge pipe) (Y3S) (R2T) High pressure switch Thermistor (Liquid pipe) (S1PH) (R7T) High pressure sensor...
Page 33 SiUS331708EA Functional Parts Layout Side view Thermistor (Outdoor air) (R1T) Thermistor (Suction pipe 1) (R3T) Thermistor (Heat exchanger deicer) (R4T) C: 1P374828Q Refrigerant Circuit...
Page 34: Rxsq60Tavju
Functional Parts Layout SiUS331708EA RXSQ60TAVJU Front view Four way valve coil Inverter fan (M1F) Four way valve coil (Y1S) Thermistor (Suction pipe 2) (R5T) Thermistor (Discharge pipe) (R2T) Inverter fan Low pressure sensor (M2F) (S1NPL) High pressure sensor (S1NPH) High pressure switch (S1PH) Compressor (M1C)
Page 35 SiUS331708EA Functional Parts Layout Side view Thermistor (Subcooling heat exchanger gas pipe) (R6T) Thermistor (Suction pipe 1) (R3T) Thermistor (Outdoor air) (R1T) Electronic expansion valve/coil (Main) (Y1E) Electronic expansion valve/coil (Subcooling) (Y3E) Thermistor (Liquid pipe) (R7T) Thermistor (Heat exchanger deicer) (R4T) C: 1P441643F Refrigerant Circuit...
Page 36 SiUS331708EA Part 3 Remote Controller 1. Applicable Models ..................24 2. Names and Functions ................25 2.1 BRC1E73 ....................25 2.2 Wireless Remote Controller ............... 28 3. Main/Sub Setting..................29 3.1 BRC1E73 ....................29 3.2 When Wireless Remote Controller is Used Together......... 30 4.
Page 37: Applicable Models
SiUS331708EA Applicable Models 1. Applicable Models Wired remote controller Wireless remote Series controller Navigation FXFQ-T – FXFQ-P BRC082A42W (for BYFQ60C3W1W) FXZQ-TA BRC082A42S (for BYFQ60C3W1S) BRC082A41W (for BYFQ60B3W1) FXZQ-M BRC7E830 FXUQ-P – FXEQ-P FXDQ-M BRC4C82 BRC1E73 FXSQ-TA BRC082A43 FXMQ-PB BRC4C82 FXHQ-M BRC7E83 FXAQ-P BRC7E818...
Page 38: Names And Functions
Names and Functions SiUS331708EA 2. Names and Functions BRC1E73 1. Operation mode selector button 11. LCD (with backlight) 4. Up button 5. Down button 6. Right button 7. Left button 9. Operation lamp 8. On/Off button 3. Menu/OK button 10. Cancel button 2.
Page 39 SiUS331708EA Names and Functions 4. Up button Used to raise the setpoint. The item above the current selection will be highlighted. (The highlighted items will be scrolled continuously when the button is continuously pressed.) Used to change the selected item. 5.
Page 40 Names and Functions SiUS331708EA Service Check Function <Main Menu> Main Menu • Airflow Direction Airflow Direction • Individual Airflow Direction Individual Airflow Direction • Ventilation Ventilation • Schedule Schedule • Off Timer Off Timer • Celsius / Fahrenheit Celsius / Fahrenheit •...
Page 41: Wireless Remote Controller
SiUS331708EA Names and Functions Wireless Remote Controller ON OFF DOWN ON OFF TEMP TIME DOWN RESERVE CANCEL TIMER TEST MODE SWING TEST TEST DISPLAY (SIGNAL TRANSMISSION) FAN SPEED CONTROL BUTTON Press this button to select the fan speed, HIGH or This lights up when a signal is being transmitted.
Page 42: Main/Sub Setting
Main/Sub Setting SiUS331708EA 3. Main/Sub Setting BRC1E73 Situation The Main/Sub setting is necessary when 1 indoor unit is controlled by 2 remote controllers. When you use 2 remote controllers (control panel and separate remote controller), set one to Main and the other to Sub. Setting The remote controllers are factory setting to Main, so you only have to change one remote controller from Main to Sub.
Page 43: When Wireless Remote Controller Is Used Together
SiUS331708EA Main/Sub Setting 3.1.2 When an error occurred U5: there are 2 main remote controllers when power is turned ON Change the setting from Main to Sub on the remote controller you want to be Sub. U8: there are 2 sub remote controller when power is turned ON Change the setting from Sub to Main on the remote controller you want to be Main.
Page 44: Address Setting For Wireless Remote Controller
Address Setting for Wireless Remote Controller SiUS331708EA 4. Address Setting for Wireless Remote Controller If setting multiple wireless remote controllers to operate in one room, perform address setting for the receiver and the wireless remote controller. (This includes an individual remote controller control using the group operation.) (For the wiring for the group operation, please refer to the installation manual attached to the indoor unit and technical guide.) Setting for signal receiver PCB...
Page 45 SiUS331708EA Address Setting for Wireless Remote Controller Setting for wireless remote controller The address for the wireless remote controller is set to 1 at the factory. To change the setting, proceed as follows: 1. Press FILTER SIGN RESET button and INSPECTION/TEST button at the same time for 4 seconds to enter field setting mode.
Page 46: Centralized Control Group No. Setting
Centralized Control Group No. Setting SiUS331708EA 5. Centralized Control Group No. Setting BRC1E73 In order to conduct the centralized remote control using the central remote controller and the unified ON/OFF controller, Group No. settings should be made by group using the operating remote controller. Make Group No.
Page 47 SiUS331708EA Centralized Control Group No. Setting Note: For setting group No. of Energy recovery ventilator and wiring adaptor for other air conditioners, etc., refer to the instruction manual. NOTICE Enter the group No. and installation place of the indoor unit into the installation table. Be sure to keep the installation table with the operation manual for maintenance.
Page 48: Wireless Remote Controller
Centralized Control Group No. Setting SiUS331708EA Wireless Remote Controller Group No. setting by wireless remote controller for centralized control 1. When in the normal mode, press INSPECTION/TEST button for 4 seconds or more to enter field setting mode. 2. Set mode No. 00 with MODE button. 3.
Page 49: Service Mode
SiUS331708EA Service Mode 6. Service Mode BRC1E73 Operating the remote controller allows service data to be acquired and various services to be set. Basic screen is displayed. Press and Press the Cancel hold the button. Press the Cancel Cancel button once. button for 4 seconds or more.
Page 50 Service Mode SiUS331708EA Maintenance Menu Item 2 Remarks Indoor Unit Status FLOAT Float switch OPEN/CLOSE T1/T2 T1/T2 input from outside OPEN/CLOSE Suction air thermistor Heat exchanger liquid pipe thermistor Heat exchanger gas pipe thermistor Discharge air thermistor — — Outdoor Unit Status Unit No.
Page 51 SiUS331708EA Service Mode ∗1. (For FXTQ-TA, CXTQ-TA models) The actual fan speed is converted into the fan tap to be displayed. Therefore, if the fan speed is changed by controls or external factors, the airflow rate set with the remote controller may differ from the fan tap display. ∗2.
Page 52 SiUS331708EA Part 4 Functions and Control 1. Operation Mode ..................40 2. Basic Control.....................41 2.1 Normal Operation ..................41 2.2 Compressor PI Control................42 2.3 Electronic Expansion Valve PI Control............43 2.4 Cooling Operation Fan Control..............44 3. Special Control..................45 3.1 Startup Control ................... 45 3.2 Oil Return Operation ..................
Page 53: Operation Mode
SiUS331708EA Operation Mode 1. Operation Mode Operation in stop mode Indoor unit stop or Indoor unit thermostat ON thermostat OFF Error/Standby Restart standby Pressure (Compressor stop) equalization prior to startup Error/ Standby Indoor unit stop or thermostat OFF Startup control Pump down •...
Page 54: Basic Control
Basic Control SiUS331708EA 2. Basic Control Normal Operation Cooling Operation Electric symbol Outdoor unit actuator Operation Remarks 24/36 class 48 class 60 class Used for high pressure protection control, low pressure protection control, discharge pipe temperature protection control, and Compressor Compressor PI control compressor operating frequency upper limit control with inverter protection...
Page 55: Compressor Pi Control
SiUS331708EA Basic Control Compressor PI Control Carries out compressor capacity control to maintain Te at constant during cooling operation and Tc at constant during heating operation thus ensuring stable unit performance. Cooling operation Controls compressor capacity to achieve target Te value (TeS). Te: Low pressure equivalent saturation temperature TeS: Target temperature of Te (Varies depending on Te setting, operating frequency, etc.) (1) VRT control (Default)
Page 56: Electronic Expansion Valve Pi Control
Basic Control SiUS331708EA RXSQ24TAVJU RXSQ36TAVJU RXSQ48TAVJU RXSQ60TAVJU Step Step Step Step Cooling Heating Cooling Heating Cooling Heating Cooling Heating 17.5 17.5 17.5 17.5 17.5 17.5 17.5 17.5 20.5 20.5 20.5 20.5 20.5 20.5 20.5 20.5 24.5 28.5 28.5 28.5 28.5 28.5...
Page 57: Cooling Operation Fan Control
SiUS331708EA Basic Control Cooling Operation Fan Control In cooling operation with low outdoor air temperature, this control is used to provide an adequate amount of circulation air with liquid pressure secured by high pressure control from the outdoor fan. Furthermore, when outdoor temperature ≥ 20°C (68°F), the compressor will run in Step 7 or higher. When outdoor temperature ≥...
Page 58: Special Control
Special Control SiUS331708EA 3. Special Control Startup Control This control is used to equalize the pressure in the suction and discharge sides of the compressor prior to compressor startup, thus reducing startup loads. Furthermore, the inverter is turned ON to charge the capacitor. In addition, to avoid stresses to the compressor due to oil return, etc., after startup, the following control is made and the position of the four way valve is also determined.
Page 59 SiUS331708EA Special Control 3.1.2 Startup Control in Heating Operation Thermostat ON Electric symbol Startup control Outdoor unit Pressure equalization control actuator prior to startup 24/36 class 48 class 60 class STEP 1 STEP 2 Increases 2 steps every 20 seconds from minimum frequency Compressor M1C 0 Hz...
Page 60: Oil Return Operation
Special Control SiUS331708EA Oil Return Operation In order to prevent the compressor from running out of oil, oil return operation is conducted to recover oil that has flowed out from the compressor to the system side. 3.2.1 Oil Return Operation in Cooling HTdi : Compressor discharge pipe temperature (Tdi) compensated with outdoor air temperature Pc : High pressure sensor detection value Pe : Low pressure sensor detection value...
Page 61 SiUS331708EA Special Control 3.2.2 Oil Return Operation in Heating Pc : High pressure sensor detection value Pe : Low pressure sensor detection value Tc : High pressure equivalent saturation temperature Te : Low pressure equivalent saturation temperature Ts1 : Suction pipe temperature detected by thermistor R3T (suction pipe 1) Tb : Heat exchanger temperature Starting conditions Referring to the set conditions for the following items, start oil return operation in heating.
Page 62: Defrost Operation
Special Control SiUS331708EA Defrost Operation Pc : High pressure sensor detection value Pe : Low pressure sensor detection value Tc : High pressure equivalent saturation temperature Te : Low pressure equivalent saturation temperature Ts1 : Suction pipe temperature detected by thermistor R3T (suction pipe 1) Tb : Heat exchanger temperature Defrost operation is performed to melt frost on the outdoor heat exchanger when heating, and thus recover heating capacity.
Page 63: Pump Down Residual Operation
SiUS331708EA Special Control Pump Down Residual Operation When activating the compressor, if liquid refrigerant remains in the evaporator, the liquid enters the compressor and dilutes oil therein resulting in a decrease in lubricity. Therefore, pump down residual operation is performed to collect refrigerant in the evaporator when the compressor is stopped.
Page 64: Restart Standby
Special Control SiUS331708EA Restart Standby Restart is forced into standby to prevent the power from frequently turning ON and OFF and to equalize pressure in the refrigerant system. Ta: Outdoor air temperature Electric symbol Outdoor unit actuator Operation 24/36 class 48 class 60 class Compressor M1F, Ta >...
Page 65: Protection Control
SiUS331708EA Protection Control 4. Protection Control High Pressure Protection Control This high pressure protection control is used to prevent the activation of protection devices due to an abnormal increase in high pressure and to protect compressors against transient increases in high pressure. Cooling operation Pc >...
Page 66 Protection Control SiUS331708EA Heating operation High pressure drop High pressure not limited Pc: High pressure sensor detection value Pc > 3.46 MPa (502 psi) Pc < 3.27 MPa (474 psi) High pressure limited Compressor upper limit frequency: 5-step down from current compressor frequency After 10 sec.
Page 67: Low Pressure Protection Control
SiUS331708EA Protection Control Low Pressure Protection Control This low pressure protection control is used to protect compressors against transient decreases in low pressure. Cooling operation Low pressure not limited Pe: Low pressure sensor detection value < 0.34 MPa > 0.39 MPa (49.3 psi) (56.6 psi) Low pressure...
Page 68: Discharge Pipe Protection Control
Protection Control SiUS331708EA Discharge Pipe Protection Control This discharge pipe protection control is used to protect the compressor internal temperature against error or transient increase in discharge pipe temperature. Discharge pipe protectioncontrol not limited HTdi: Value of compressor discharge pipe temperature (Tdi) compensated with outdoor air temperature Value of compressor port temperature...
Page 69: Inverter Protection Control
SiUS331708EA Protection Control Inverter Protection Control Inverter current protection control and inverter fin temperature control are performed to prevent tripping due to error, transient inverter overcurrent, and fin temperature increase. Inverter overcurrent protection control Not limited Inverter current ≤ 13.7 A (24/36 class) •...
Page 70 Protection Control SiUS331708EA According to the current limit of direct current Not limited Compressor stopped Existing DC power limit • No DC power limit requirement. requirement. Compressor upper limit : Maximum frequency • Limited Inverter upper limit frequency: 1-step down from current compressor frequency Existing DC power •...
Page 71: Other Control
SiUS331708EA Other Control 5. Other Control Demand Operation In order to reduce power consumption, the outdoor unit capacity is reduced forcibly with control by using Demand Setting 1. To enable this operation, the additional setting of Constant Demand Setting is required. Demand setting 1 Level Standard for upper limit of power consumption...
Page 72: Outline Of Control (Indoor Unit)
Outline of Control (Indoor Unit) SiUS331708EA 6. Outline of Control (Indoor Unit) Operation Flowchart Cooling Operation Start (Option) Turn ON Aux. electric : OFF ∗4 power supply heater Humidifier : OFF Initialize electronic expansion valve Swing flap Detect louver lock prevention condition? The previous settings of airflow LED in remote...
Page 73 SiUS331708EA Outline of Control (Indoor Unit) ∗10 Program dry operation Fan Operation Program ∗8 Drain dry display : OFF pump kit (Option) ∗9 Aux. ∗4 : OFF electric heater Thermostat status (Option) Humidifier : OFF : Operating in L mode after it stops for 6 min. Operating in L mode Electronic YE :...
Page 74 Outline of Control (Indoor Unit) SiUS331708EA Heating Operation Drain : OFF pump kit Swing flap? ∗13 ∗13 Set wind direction Swing flap Is test run in progress? ∗18 defrost conditions for gas operation in furnace operation Depends on the intensity progress? established? of gas combustion.
Page 75 SiUS331708EA Outline of Control (Indoor Unit) ∗4. The control of auxiliary electric heater connected to FXTQ-TA models differ from this flowchart. For details, refer to Heater Control (FXTQ-TA Models) on page 79. ∗5. If the evaporator inlet temperature is kept at not more than –5°C (23°F) for a period of cumulative 10 min.
Page 76: Set Temperature And Control Temperature
Outline of Control (Indoor Unit) SiUS331708EA Set Temperature and Control Temperature 6.2.1 Without Optional Infrared Presence/Floor Sensor The relationship between remote controller set temperature and control target temperature is described below. • When the suction air thermistor is used for controlling (Default), the control target temperature is determined as follows to prevent insufficient heating in heating operation.
Page 77 SiUS331708EA Outline of Control (Indoor Unit) 6.2.2 With Optional Infrared Presence/Floor Sensor The relationship between remote controller set temperature and control target temperature is described below. The temperature difference for cooling ⇔ heating mode switching is 5°C (9°F). • • When using the floor temperature as the control target, the remote controller set temperature is equal to the actual control target temperature in heating operation.
Page 78: Remote Controller Thermistor
Outline of Control (Indoor Unit) SiUS331708EA Remote Controller Thermistor Temperature is controlled by both the remote controller thermistor and suction air thermistor for the indoor unit. (This is however limited to when the field setting for the remote controller thermistor is set to Use.) Note: When outdoor air is introduced to the air-conditioner with mixed into indoor air, the room...
Page 79 SiUS331708EA Outline of Control (Indoor Unit) Heating When heating, the hot air rises to the top of the room, resulting in the temperature being lower near the floor where the occupants are. When controlling by suction air thermistor only, the indoor unit may therefore be turned off by the thermostat before the lower part of the room reaches the set temperature.
Page 80: Thermostat Control
Outline of Control (Indoor Unit) SiUS331708EA Thermostat Control 6.4.1 Without Optional Infrared Presence/Floor Sensor Whether the thermostat is turned ON or OFF is determined by the difference between the remote controller set temperature and the actual detected room temperature (∗1). Normal operation ·...
Page 81 SiUS331708EA Outline of Control (Indoor Unit) 6.4.2 With Optional Infrared Presence/Floor Sensor Whether the thermostat is turned on or off is determined by the difference between the remote controller set temperature and the detected temperature around people. Normal operation · Cooling operation ∆T ≤...
Page 82 Outline of Control (Indoor Unit) SiUS331708EA 6.4.3 Thermostat Control with Operation Mode Set to AUTO When the operation mode is set to AUTO on the remote controller, the system will conduct the temperature control shown below. Furthermore, setting changes of the differential value (D) can be made referring to page 88 and later (Field Settings from Remote Controller).
Page 83: List Of Swing Flap Operations
SiUS331708EA Outline of Control (Indoor Unit) List of Swing Flap Operations Flap FXFQ FXEQ, FXHQ FXAQ Swing L (∗1) Swing Swing Swing Thermostat ON in program dry Airflow direction set L (∗1) Swing Swing Swing Swing Thermostat OFF in OFF or L program dry Airflow direction set Horizontal or Set...
Page 84: Hot Start Control (In Heating Operation Only)
Outline of Control (Indoor Unit) SiUS331708EA Hot Start Control (In Heating Operation Only) At startup with thermostat ON or after the completion of defrosting in heating operation, the indoor fan is controlled to prevent cold air from blasting out and ensure startup capacity. TH2: Temperature detected with the gas thermistor TC : High pressure equivalent saturated temperature Starting condition...
Page 85: Louver Control For Preventing Ceiling Dirt
SiUS331708EA Outline of Control (Indoor Unit) Louver Control for Preventing Ceiling Dirt FXFQ, FXZQ, FXEQ models We have added a control feature that allows you to select the range in which air direction can be adjusted in order to prevent the ceiling surrounding the air discharge outlet of ceiling mounted cassette type units from being soiled.
Page 86: Drain Pump Control
Outline of Control (Indoor Unit) SiUS331708EA Drain Pump Control 6.8.1 Normal Operation Float switch Thermostat (running) Error display Drain pump 5 min. • The float switch is ON in normal operation. • When cooling operation starts (thermostat ON), the drain pump turns ON simultaneously. •...
Page 87 SiUS331708EA Outline of Control (Indoor Unit) 6.8.3 If the Float Switch is OFF with the Thermostat OFF in Cooling Operation Float switch Thermostat (running) Error display Drain pump 5 min. 5 sec. • When the float switch turns OFF, the drain pump turns ON simultaneously. •...
Page 88: Electronic Expansion Valve Control
Outline of Control (Indoor Unit) SiUS331708EA Electronic Expansion Valve Control Electronic expansion valves in indoor units have the functions of conducting superheated degree control in cooling operation and subcooled degree control in heating operation. However, if the indoor units receive a control command such as a protection control command or a special control command from the outdoor unit, the units will give priority to the control command.
Page 89: Freeze-Up Prevention
SiUS331708EA Outline of Control (Indoor Unit) 6.10 Freeze-Up Prevention Freeze-Up Prevention by Off Cycle (Indoor Unit Individual Control) When the temperature detected by the liquid pipe temperature thermistor of the indoor heat exchanger drops too low, the unit enters freeze-up prevention control in accordance with the following conditions, and is also set in accordance with the conditions given below.
Page 90 Outline of Control (Indoor Unit) SiUS331708EA Note: When the indoor unit is a round flow or multi flow type, if the air outlet is set as dual-directional or tri- directional, the starting conditions will be changed as follows. Liquid pipe temperature ≤ 1°C (33.8°F) (for total of 15 minutes) Liquid pipe temperature ≤...
Page 91: Heater Control (Except Fxtq-Ta Models)
SiUS331708EA Outline of Control (Indoor Unit) 6.11 Heater Control (Except FXTQ-TA Models) Note: Optional PCB KRP1B ... is required. The heater control is conducted in the following manner. Normal control While in heating, the heater control (ON/ Set temperature OFF) is conducted as shown on the right. 2˚C 2˚C (3.6˚F)
Page 92: Heater Control (Fxtq-Ta Models)
Outline of Control (Indoor Unit) SiUS331708EA 6.12 Heater Control (FXTQ-TA Models) Note: Optional heater kit HKS... is required. For FXTQ-TA models, heater ON/OFF output from wiring adaptor interlocks with the operation of heater kit HKS….(When the heater 1 turns ON/OFF, heater output of wiring adaptor turns ON/OFF.) Fan residual operation also interlocks with the fan residual operation of heater kit HKS….
Page 93 SiUS331708EA Outline of Control (Indoor Unit) Condition A • No fan motor system error • High pressure condition: ON (∗1) • Liquid pipe temperature condition: ON (∗2) • Heater ON permission (Defrost/oil Return): 0 (∗4) & & • Not during defrost/oil return •...
Page 94 Outline of Control (Indoor Unit) SiUS331708EA 6.12.2 Heat Pump Lockout Control For heating operation, users can select to use electric heater. For this, signals are sent using ABC terminal of outdoor unit PCB. When the hot-water heating signal is received from the outdoor unit PCB, heating operation is performed only with the electric heater as manual backup operation.
Page 95: Gas Furnace Control (Cxtq-Ta Models)
SiUS331708EA Outline of Control (Indoor Unit) 6.13 Gas Furnace Control (CXTQ-TA Models) Outline When conditions for gas furnace operation are established, the system transits into the standby mode for pre-gas furnace operation. In this status, heating operation is not performed with either heat pump or gas furnace.
Page 96: 3-Step Thermostat Processing (Fxtq-Ta Models)
Outline of Control (Indoor Unit) SiUS331708EA Note: The airflow rate during gas furnace operation depends on the intensity of combustion heating and therefore may be different from the airflow setting displayed on the remote controller. 6.14 3-Step Thermostat Processing (FXTQ-TA Models) Outline The thermostat ON/OFF for the indoor unit is controlled in accordance with Thermostat step 1.
Page 97: 2-Step Thermostat Processing (Cxtq-Ta Models)
SiUS331708EA Outline of Control (Indoor Unit) 6.15 2-Step Thermostat Processing (CXTQ-TA Models) Outline The thermostat ON/OFF of the indoor unit is controlled in accordance with Thermostat step 1. The gas furnace ON/OFF is controlled in accordance with Thermostat step 2. When gas furnace operation requiring ON signal or water heater ON signal is sent from the outdoor unit, gas furnace ON/OFF is controlled in accordance with Thermostat step 1.
Page 98: Fan Control (Heater Residual) (Fxtq-Ta Models)
Outline of Control (Indoor Unit) SiUS331708EA 6.16 Fan Control (Heater Residual) (FXTQ-TA Models) Outline If the indoor heater turned OFF from ON during heating operation, the fan will keep operating for further period of time in order to cool the heater. Detail Residual ON •...
Page 99 SiUS331708EA Outline of Control (Indoor Unit) 6.17.3 Economizer When indoor and outdoor air temperatures are reversed, the compressor is stopped to let in the outdoor air to save energy. This operation is called economizer operation, and the equipment to detect indoor and outdoor air temperatures and open and close the damper to perform this operation is called an economizer.
Page 100 SiUS331708EA Part 5 Field Settings and Test Operation 1. Field Settings from Remote Controller ............88 1.1 Wired Remote Controller — BRC1E73 ............88 1.2 Wireless Remote Controller ............... 90 1.3 List of Field Settings for Indoor Unit ............91 1.4 Gas Furnace Set Up................. 109 1.5 List of Field Settings for Outdoor-Air Processing Unit ......
Page 101: Field Settings From Remote Controller
SiUS331708EA Field Settings from Remote Controller 1. Field Settings from Remote Controller Individual function 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. Wrong setting may cause error.
Page 102 Field Settings from Remote Controller SiUS331708EA Press Menu/OK button. Setting confirmation screen is displayed. <Setting confirmation screen> Select Yes and press Menu/OK button. Setting details are determined and field settings screen returns. In the case of multiple setting changes, repea t (3) to (7). After all setting changes are Press Menu/OK button.
Page 103: Wireless Remote Controller
SiUS331708EA Field Settings from Remote Controller Wireless Remote Controller UP button Mode No. Field setting mode DOWN button RESERVE button First code No. MODE button Second code No. INSPECTION/TEST button To set the field settings, you have to change: Mode No. First code No.
Page 104: List Of Field Settings For Indoor Unit
Field Settings from Remote Controller SiUS331708EA List of Field Settings for Indoor Unit : Factory setting Mode First Second Code No. Code Setting Contents (∗2) Approx. Approx. Ultra long life 10,000 5,000 Filter sign setting filter hrs. hrs. (Setting for display time to clean air filter) Approx.
Page 105 SiUS331708EA Field Settings from Remote Controller Mode First Second Code No. Code Setting Contents (∗2) Setting of airflow rate Refer to page 103 for details. Airflow direction setting F (4 directions) T (3 directions) — (Set when a blocking pad kit has been installed.) (2 directions) All direction 2 (∗9) Swing pattern settings...
Page 106 Field Settings from Remote Controller SiUS331708EA 1.3.1 Applicable Range of Field Settings Ceiling mounted 4-way blow One way Slim Ceiling mounted Ceiling Wall Floor Concealed Cased cassette type ceiling blow ceiling duct type suspended mounted standing floor handling Coil unit suspended cassette mounted...
Page 107 SiUS331708EA Field Settings from Remote Controller 1.3.2 Details of Field Settings for Indoor Unit Filter Sign Setting 10(20)-1 01: Long life filter 02: Ultra long life filter Setting Filter contamination heavy/light Light Heavy Light Heavy 10(20)-0 FXFQ-T FXFQ-P FXZQ-TA FXZQ-M FXUQ-P FXEQ-P 2,500 hrs.
Page 108 Field Settings from Remote Controller SiUS331708EA FXTQ-TA, CXTQ-TA Mode No. First Code No. Second Code No. Contents — 10 (20) Remote sensor thermistor Remote controller thermistor When the Second Code No. is set to 02, room temperature is controlled by the remote sensor thermistor. When the Second Code No.
Page 109 SiUS331708EA Field Settings from Remote Controller Note that the control is automatically switched to the one performed only by the suction air thermistor for indoor unit when the Second code No. is 01 during group control. To use the remote controller thermistor during group control, select the Second code No. 02 in First code No. 6. Mode No.
Page 110 Field Settings from Remote Controller SiUS331708EA Auxiliary Electric Heater ON/OFF Temperature Gas Furnace ON/OFF Temperature Thermostat Set temperature Thermostat Toff + S(∗1) Ton + S (∗1) Note: ∗1. S value varies automatically based on the room temperature trend. FXFQ-T, FXMQ-PB Second Code No.
Page 111 SiUS331708EA Field Settings from Remote Controller Second Code No. –4°C –3.5°C –3°C –2.5°C –2°C –1.5°C –100°C (–7.2°F) (–6.3°F) (–5.4°F) (–4.5°F) (–3.6°F) (–2.7°F) (–148°F) –98°C (–144.4°F) — — — — — — 0.5°C (0.9°F) 0°C (0°F) — –0.5°C (–0.9°F) — — –1°C (–1.8°F) —...
Page 112 Field Settings from Remote Controller SiUS331708EA Electric Heater Capacity Setting (for FXTQ-TA models) Second Code No. First Mode Model Code Heater (kW) heater kit FXTQ09TAVJUA — — — — — — — FXTQ09TAVJUD — — — — — — — FXTQ12TAVJUA —...
Page 113 SiUS331708EA Field Settings from Remote Controller Airflow Adjustment (AUTO) The volume of blow-off air is automatically adjusted to the rated quantity. Make settings before performing the test operation of the outdoor unit. Setting procedure (1) Make sure that electric wiring and duct construction have been completed. In particular, if the closing damper is installed on the way of the duct, make sure that it is open.
Page 114 Field Settings from Remote Controller SiUS331708EA Compensating the Floor Temperature (For units with the infrared presence/floor sensor only) Offset the detected value of the infrared floor sensor with a certain temperature. This setting should be used to have the actual floor temperature detected when, for example, the unit is installed close to a wall. Mode No.
Page 115 SiUS331708EA Field Settings from Remote Controller Thermostat Switching Differential value during thermostat ON/OFF control can be changed. Mode No. First Code No. Second Code No. Contents 1°C (1.8°F) 12 (22) 0.5°C (0.9°F) Airflow Setting when Heating Thermostat is OFF This setting is used to set airflow when heating thermostat is OFF. ∗...
Page 116 Field Settings from Remote Controller SiUS331708EA Setting of Airflow Rate Make the following setting according to the ceiling height. The second code No. is set to 01 at the factory. FXFQ07-24T, FXFQ09-30P, FXUQ18/24P Ceiling height First Code Second Mode No. Contents Code No.
Page 117 SiUS331708EA Field Settings from Remote Controller Swing Pattern Settings (For units with the infrared presence/floor sensor only) Set the flap operation in swing mode. With the factory swing, flaps facing each other are synchronized to operate, and flaps placed side by side are set to swing in an opposite direction to agitate airflow to reduce temperature irregularity.
Page 118 Field Settings from Remote Controller SiUS331708EA External Static Pressure Settings FXMQ-PB models Mode No. First Code No. Second Code No. Contents 30 Pa (0.12 inWG) (∗1) (∗3) 50 Pa (0.20 inWG) 60 Pa (0.24 inWG) 70 Pa (0.28 inWG) 80 Pa (0.32 inWG) 90 Pa (0.36 inWG) 100 Pa (0.40 inWG) 13 (23)
Page 119 SiUS331708EA Field Settings from Remote Controller Optional Kit Setting (UV lamp + Humidifier + Economizer) (for FXTQ-TA and CXTQ-TA models) Contents Economizer setting for Mode No. First Code No. Second Code No. UV lamp + humidifier fan Mech standby duration speed (minutes) Refer to controller...
Page 120 Second Code No. Contents Not individual 15 (25) Individual Display of Contact Center (For BRC1E73 only) You can turn OFF the display of "DAIKIN Contact Center" as "Contact for Service Display." Mode No. First Code No. Second Code No. Contents Displayed...
Page 121 SiUS331708EA Field Settings from Remote Controller Key-lock Pattern Settings (For BRC1E73 only) Setting of key-lock pattern for the remote controller Mode No. First Code No. Second Code No. Contents No operation allowed (Cancel procedure is displayed.) No operation allowed (Cancel procedure is not displayed.) No menu operation is allowed.
Page 122: Gas Furnace Set Up
Field Settings from Remote Controller SiUS331708EA Gas Furnace Set Up Set-up for gas furnace is possible only by using the DIP switches located on CXTQ-TA. Gas furnace’s DIP switch is not valid. Refer to the gas furnace’s installation manual for details of each setting menu.
Page 123: List Of Field Settings For Outdoor-Air Processing Unit
SiUS331708EA Field Settings from Remote Controller List of Field Settings for Outdoor-Air Processing Unit : Factory setting First Second Code No. Mode Setting Contents Code Filter contamination 2500 hr 1250 hr — — — — — — — — — —...
Page 124 Field Settings from Remote Controller SiUS331708EA 1.6.2 How to Select Operation Mode Whether operation by remote controller will be possible or not for turning ON/OFF, controlling temperature or setting operation mode is selected and decided by the operation mode given on the right edge of the table below. Example OFF by remote ON by remote...
Page 125: Field Settings From Outdoor Unit
SiUS331708EA Field Settings from Outdoor Unit 2. Field Settings from Outdoor Unit Capacity Setting Caution Be sure to carry out capacity setting after changing the main PCB (A1P) to spare PCB. (for RXSQ48/60TAVJU only) Attach the capacity setting adaptor corresponding to capacity class to connector X51A. Capacity setting is not required for RXSQ24/36TAVJU.
Page 126: Setting Mode And Monitor Mode
Field Settings from Outdoor Unit SiUS331708EA Setting Mode and Monitor Mode The following 3 modes can be changed over with the button switches on the PCB and you can find the present mode by the status of the H1P indicator. H1P H3P H5P H7P H2P H4P H6P MODE...
Page 127: Setting Mode 1
SiUS331708EA Field Settings from Outdoor Unit Setting Mode 1 This mode is used to set and check the following items. 1. Set items .... In order to make COOL/HEAT selection in a batch of outdoor unit group, change the setting. •...
Page 128: Setting Mode 2
Field Settings from Outdoor Unit SiUS331708EA Setting Mode 2 Setting item Description Press the MODE (BS1) button for 5 seconds and enter the setting mode Cool / heat unified Sets address for cool / heat unified operation. address Low noise / demand Address for low noise / demand operation address Used to conduct test operation without making changes to the...
Page 129 SiUS331708EA Field Settings from Outdoor Unit Setting item Description Heating comfort setting Selects comfort level of VRT heating. Heat pump would be resumed when the outdoor ambient Heat pump lockout temperature is recovered by differential above the heat pump release differential lockout temperature.
Page 130 Field Settings from Outdoor Unit SiUS331708EA Setting item display C/H selection Setting condition display MODE TEST Demand Setting item noise Master Slave ∗ Factory setting k h h h h h h ∗ Address k h h h h h k Binary number Cool / heat unified address...
Page 131 SiUS331708EA Field Settings from Outdoor Unit Setting item display C/H selection Setting condition display MODE TEST Demand Setting item noise Master Slave ∗ Factory setting k h h h h h h k h h h h h k –20.5°C (–5°F) k h h h h k h k h h h h k k –17.7°C (0°F)
Page 132 Field Settings from Outdoor Unit SiUS331708EA Setting item display C/H selection Setting condition display MODE TEST Demand Setting item noise Master Slave ∗ Factory setting k h h h h h k 60 % demand k h h h h k h ∗ 30 Demand setting 1 70 % demand k h h h k h h...
Page 133 SiUS331708EA Field Settings from Outdoor Unit Setting item display C/H selection Setting condition display MODE TEST Demand Setting item noise Master Slave ∗ Factory setting k h h h h h h 2.8°C (5°F) Auxiliary heater k h h h h h k ∗ maximum allowable 5.6°C (10°F) temperature release...
Page 134: Monitor Mode
Field Settings from Outdoor Unit SiUS331708EA Monitor Mode LED display Press the MODE (BS1) button and Setting item Data display enter the monitor mode. H3P H4P l h h h h h h Various setting See the note below. l h h h h h k Cool / heat unified address l h h h h k h Low noise / demand address...
Page 135 SiUS331708EA Field Settings from Outdoor Unit Press the SET (BS2) button and match with the LEDs No. 1 - 15, push the RETURN (BS3) button, and confirm the data for each setting. Data such as addresses and number of units is expressed as binary numbers; the two ways of expressing are as follows: The No.
Page 136: Setting Of Low Noise Operation And Demand Operation
Field Settings from Outdoor Unit SiUS331708EA Setting of Low Noise Operation and Demand Operation Setting of Low Noise Operation By connecting the external contact input to the low noise input of the external control adaptor for outdoor unit (optional), you can lower operating noise by 2-3 dB. When the low noise operation is automatically carried out at night (The external control adaptor for outdoor unit is not required) 1.
Page 137 SiUS331708EA Field Settings from Outdoor Unit Setting of Demand Operation By connecting the external contact input to the demand input of the external control adaptor for outdoor unit (optional), the power consumption of unit operation can be saved suppressing the compressor operating condition.
Page 138 Field Settings from Outdoor Unit SiUS331708EA Detailed Setting Procedure of Low Noise Operation and Demand Control 1. Setting mode 1 (H1P OFF) In setting mode 2, push the MODE (BS1) button one time. → The system enters setting mode 1 and the H1P goes off.
Page 139: Setting Of Refrigerant Recovery Mode
SiUS331708EA Field Settings from Outdoor Unit Setting of Refrigerant Recovery Mode When carrying out the refrigerant collection on site, fully open the respective electronic expansion valve of indoor and outdoor units. All indoor and outdoor unit’s operation are prohibited. Operation procedure (1) In setting mode 2 with units in stop mode, set the item 2-21 (refrigerant recovery / vacuuming mode) to ON.
Page 140: Check Operation
Field Settings from Outdoor Unit SiUS331708EA Note: • The outdoor air temperature must be between 18.3°C (65°F) and 40.6°C (105°F). • The operation is not possible when a vessel is attached to the liquid piping. • The compressor rotation speed must be at or above that of charge mode. (Confirm with the LED display on the outdoor unit PCB.) •...
Page 141: Setting Of Auxiliary Heater Control
SiUS331708EA Field Settings from Outdoor Unit 2.11 Setting of Auxiliary Heater Control To improve efficiency and lower install cost the auxiliary heater can be lockout based on outdoor temperature. Auxiliary heater maximum allowable temperature Auxiliary heater is allowed to energize when the outdoor air temperature is smaller than the auxiliary heater maximum allowable temperature.
Page 142: Setting Of Heat Pump Lockout And Emergency Heat Mode
Field Settings from Outdoor Unit SiUS331708EA 2.12 Setting of Heat Pump Lockout and Emergency Heat Mode Heat pump is locked out when the setting below and/or external input to ABC terminal has been made. Setting item display Setting condition display C/H selection MODE TEST...
Page 143 SiUS331708EA Field Settings from Outdoor Unit Heat pump lockout temperature Heat pump would be locked out when the outdoor air temperature is smaller than the heat pump lockout temperature. This setting is only effective when heat pump lockout mode has been set. When connecting with multiple gas furnaces, the field setting both 11(21)-1, 2 of indoor unit must be set to 07.
Page 144: Test Operation
Test Operation SiUS331708EA 3. Test Operation Follow the following procedure to conduct the initial test operation after installation. Check Work Prior to Turning Power Supply ON Is the power supply appropriate? • Check the below items. Have you finished a ductwork to drain? •...
Page 145: Test Operation
SiUS331708EA Test Operation Test Operation To start smoothly, a crankcase heater is equipped to the unit. To power up the crankcase heater in advance, be sure to turn on the power supply 6 hours before operation. Warning Be sure to inform other installers or attach the front panel well before leaving with the power supply turned on for the outdoor unit.
Page 146 Test Operation SiUS331708EA Caution Power supply has been turned on for outdoor unit, be careful to avoid electric shock. • Set the push buttons (BS1 ~ 5) after making sure the service monitoring lamp has been ON. • For setting method, see the "Service Precautions" label attached to the front panel of the outdoor unit. (Be sure to keep a record of the setting items to the "Service Precautions"...
Page 147 SiUS331708EA Test Operation 2. For normal operation Set the master unit (the indoor unit with cooling and heating option rights) For wired remote controller After test operation is completed, the symbol MASTER CONTROLLED blinks on all connected remote controllers. Set the master unit as per customer's request. (It is recommended to set the indoor unit with highest frequency of use as the master unit.) Press the operation mode changeover button on the remote controller of the master unit.
Page 148: Gas Furnace Test Operation
Test Operation SiUS331708EA Gas Furnace Test Operation Caution: Always use the remote controller to stop the test operation. The test should be performed with the following procedure. 1. All install process, including heat pump system, has been done. 2. Test operation of heat pump system has been successfully completed. 3.
Page 149: Error Codes And Corresponding Measures
SiUS331708EA Test Operation Error Codes and Corresponding Measures Please check the remote controller connected to the indoor unit for verification. Error code Description Solution High pressure switch activated (S1PH) Check the stop valve or (field) piping abnormality or the airflow on the air cooling heat exchanger. ·...
Page 150 Test Operation SiUS331708EA Error code Description Solution Defective indoor unit connection or mismatched Check if there are any other defective indoor models (R-410A, R-407C, RA, Hydrobox, etc.). units and verify if the indoor unit combination meets requirements. Defective indoor unit connection or mismatched Check if there are any other defective indoor models (R-410A, R-407C, RA, Hydrobox, etc.).
Page 151: When Turning On Power First Time
SiUS331708EA Test Operation 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 ..Blinks Can also be set during operation described above. Indoor unit If ON button is pushed during operation described above, the UH error indicator blinks.
Page 152 SiUS331708EA Part 6 Service Diagnosis 1. Servicing Items to be Confirmed ............. 142 1.1 Troubleshooting..................142 1.2 Precautions for Maintenance..............142 1.3 Refrigerant Properties (R-410A)............... 143 2. Symptom-Based Troubleshooting............144 2.1 Indoor Unit Overall ................... 144 2.2 With Optional Infrared Presence/Floor Sensor......... 147 2.3 With Gas Furnace ..................
Page 153 SiUS331708EA 4.29 Remote Controller Thermistor Abnormality ..........198 4.30 Outdoor Main PCB Abnormality ............... 199 4.31 Activation of High Pressure Switch ............200 4.32 Activation of Low Pressure Sensor ............202 4.33 Inverter Compressor Motor Lock.............. 204 4.34 Outdoor Fan Motor Abnormality ............... 206 4.35 Electronic Expansion Valve Coil Abnormality...........
Page 154 SiUS331708EA 5. Check ...................... 257 5.1 High Pressure Check ................257 5.2 Low Pressure Check ................258 5.3 Superheat Operation Check..............259 5.4 Power Transistor Check ................260 5.5 Refrigerant Overcharge Check..............261 5.6 Refrigerant Shortage Check..............262 5.7 Vacuuming and Dehydration Procedure ..........263 5.8 List of Inverter-Related Error Codes............
Page 155: Servicing Items To Be Confirmed
SiUS331708EA Servicing Items to be Confirmed 1. Servicing Items to be Confirmed Troubleshooting (1) Initial verification and troubleshooting 1. Properly understand the end user's needs and issues. 2. Check the cause of errors according to the description provided by the end user. 3.
Page 156: Refrigerant Properties (R-410A)
Servicing Items to be Confirmed SiUS331708EA (5) Precautions for operating in servicing mode (field setting): When a test operation is interrupted or after exiting service mode, please wait for at least one minute before entering service mode again. In case of continuous execution, the outdoor unit PCB may sometimes display an error code. If any error codes are displayed, press the RETURN (BS3) button.
Page 157: Symptom-Based Troubleshooting
SiUS331708EA Symptom-Based Troubleshooting 2. Symptom-Based Troubleshooting Indoor Unit Overall 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 158 Symptom-Based Troubleshooting SiUS331708EA Symptom Supposed Cause Countermeasure COOL/HEAT The remote controller displays This remote controller has no option Use a remote controller with option to select cooling operation. to select cooling operation. selection is UNDER CENTRALIZED disabled. CONTROL. The remote controller displays COOL/HEAT selection is made Use the COOL/HEAT selection using the COOL/HEAT selection...
Page 159 SiUS331708EA Symptom-Based Troubleshooting Symptom Supposed Cause Countermeasure 11 The system Indoor unit These are operating sounds of the Normal operation. produces Immediately after turning ON electronic expansion valve of the This sound becomes low after a sounds. the power supply, indoor unit indoor unit.
Page 160: With Optional Infrared Presence/Floor Sensor
Symptom-Based Troubleshooting SiUS331708EA With Optional Infrared Presence/Floor Sensor Condition Measure 1 "Louver operation different from setting" or "No downward Refer to the following table. airflow in heating operation" 2 Individual airflow direction setting different from the actual · Check the "Louver operation different from setting" error airflow direction diagnosis.
Page 161: With Gas Furnace
SiUS331708EA Symptom-Based Troubleshooting With Gas Furnace Symptom Supposed Cause The gas furnace does not start operation while the compressor 1 The gas furnace does not start operation. is during operation or under stop-control, or right after defrost IN or defrost OUT. Wait until the operation becomes stable. This function is performed only with outdoor units which support automatic switching between gas furnace and heat pump interlocking with room temperature.
Page 162: Service Check Function
Menu button blinks at the bottom of the screen. (2) Take corrective action. · Press the Menu/OK button to check the error code. Error code FXFQ07TVJU Applicable RXSQ24TAVJU · Take the corrective action specific to the model. model names Service Diagnosis...
Page 163: Wireless Remote Controller
SiUS331708EA Service Check Function Wireless Remote Controller If the unit stops due to an error, the operation indicating LED on the signal receiving part of indoor unit blinks. The error code can be determined by following the procedure described below. (The error code is displayed when an operation error has occurred.
Page 164 Service Check Function SiUS331708EA The lower digit of the code changes as shown below. 0 1 2 3 4 5 6 7 8 9 A H C J E F "UP" button "DOWN" button Continuous beep : Both upper and lower digits match. (Error code is confirmed.) 2 short beeps : The upper digit matches but the lower digit does not.
Page 165: Troubleshooting By Error Code
SiUS331708EA Troubleshooting by Error Code 4. Troubleshooting by Error Code Error Codes and Descriptions k: ON h: OFF l: Blink Operation Reference Error code Description lamp Page Indoor Unit External protection device abnormality Indoor unit PCB abnormality Drain level control system abnormality Fan motor lock, overload Indoor fan motor abnormality Blower motor not running...
Page 166 Troubleshooting by Error Code SiUS331708EA k: ON h: OFF l: Blink Operation Reference Error code Description lamp Page Outdoor Unit Inverter compressor instantaneous overcurrent Inverter compressor overcurrent Inverter compressor startup abnormality Transmission error (between microcomputers on the outdoor main PCB) Inverter circuit capacitor high voltage P4 (∗1) Radiation fin thermistor abnormality...
Page 167: Error Codes - Sub Codes
SiUS331708EA Troubleshooting by Error Code Error Codes - Sub Codes If an error code like the one shown below is displayed when the navigation remote controller (BRC1E series) is in use, make a detailed diagnosis or a diagnosis of the relevant unit. 4.2.1 Indoor Unit Troubleshooting Error code...
Page 168 Troubleshooting by Error Code SiUS331708EA Troubleshooting Error code Description of error Description of diagnosis Refer to the U4 flowchart. U4 - 01 Indoor-outdoor transmission error UA - 13 Refrigerant type error The type of refrigerant used for the indoor unit is different from that used for the outdoor unit.
Page 169: Error Code Indication By Outdoor Unit Pcb
SiUS331708EA Troubleshooting by Error Code Error Code Indication by Outdoor Unit PCB Monitor mode To enter the monitor mode, press Error Description Error Code the MODE (BS1) button when in PCB abnormality “Setting mode 1”. Abnormal high pressure switch High pressure switch activated Abnormal low pressure switch Low pressure switch activated Compressor lock...
Page 170 Troubleshooting by Error Code SiUS331708EA k: ON h: OFF l: Blink Confirmation of Error 1 Confirmation of Error 2 Confirmation of Error 3 Confirmation of Error 4 Error 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 171 SiUS331708EA Troubleshooting by Error Code Monitor mode Error Description Error Code To enter the monitor mode, press Inverter over-ripple protection Imbalance of inverter power supply the MODE (BS1) button when in voltage “Setting mode 1”. Defective temperature sensor of Defective thermistor of inverter fin inverter radiation fin Refrigerant shortage Refrigerant shortage alarm...
Page 172 Troubleshooting by Error Code SiUS331708EA k: ON h: OFF l: Blink Confirmation of Error 1 Confirmation of Error 2 Confirmation of Error 3 Confirmation of Error 4 Error 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 Display 1 of Display 2 of...
Page 173: External Protection Device Abnormality
SiUS331708EA Troubleshooting by Error Code External Protection Device Abnormality Error Code Applicable All indoor units Models Method of Error Detect open or short circuit between external input terminals in indoor unit. Detection Error Decision When an open circuit occurs between external input terminals with the remote controller set for Conditions external ON/OFF input.
Page 174 Troubleshooting by Error Code SiUS331708EA 4.4.1 External Protection Device Abnormality (FXTQ-TA and CXTQ-TA Only) A0-01 Error Code Applicable FXTQ-TA, CXTQ-TA Models Method of Error Detect open or short circuit between external input terminals in indoor unit. Detection Error Decision When an open circuit occurs between external input terminals. Conditions Supposed Actuation of external protection device...
Page 175: Indoor Unit Pcb Abnormality
SiUS331708EA Troubleshooting by Error Code Indoor Unit PCB Abnormality Error Code Applicable All indoor units Models Method of Error Data from EEPROM is checked. Detection Error Decision When data cannot be correctly received from the EEPROM Conditions EEPROM: Type of nonvolatile memory. Maintains memory contents even when the power supply is turned OFF.
Page 176: Drain Level Control System (S1L) Abnormality
Troubleshooting by Error Code SiUS331708EA Drain Level Control System (S1L) Abnormality Error Code Applicable FXFQ, FXZQ, FXUQ-P, FXEQ-P, FXDQ-M, FXSQ-TA, FXMQ-PB Models Method of Error By float switch OFF detection Detection Error Decision When rise of water level is not a condition and the float switch goes OFF Conditions Supposed 208-230 V power supply is not provided...
Page 177 SiUS331708EA Troubleshooting by Error Code The drain pump works when Check the drain piping for the power supply is reset for clogging or upward slope, etc. the indoor unit. voltage of drain pump terminals (∗2) is in accordance to the Replace the indoor unit main criteria (∗3) (within 5 PCB (A1P).
Page 178: Indoor Fan Motor (M1F) Lock, Overload
Troubleshooting by Error Code SiUS331708EA Indoor Fan Motor (M1F) Lock, Overload Error Code Applicable FXFQ, FXZQ-TA, FXUQ-P, FXEQ-P, FXSQ05-48TA, FXMQ07-12PB, FXAQ-P Models Method of Error Abnormal fan revolutions are detected by a signal output from the fan motor. Detection Error Decision When the fan revolutions do not increase Conditions Supposed...
Page 179 SiUS331708EA Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn OFF the power supply, and then wait for a period of 10 minutes. Are there any foreign matter Remove the foreign matter.
Page 180 Troubleshooting by Error Code SiUS331708EA ∗1: Check the following connectors. Note: Model Connector FXFQ-T X20A, Relay connector FXFQ09-30P X20A, Relay connector FXFQ36/48P X20A FXZQ-TA X20A, Relay connector FXUQ-P X20A, Relay connector FXEQ-P X20A FXSQ05-48TA FXMQ07-12PB FXAQ-P X20A ∗2. Resistance measuring points and judgment criteria. 1 —...
Page 181: Indoor Fan Motor Abnormality
SiUS331708EA Troubleshooting by Error Code Indoor Fan Motor Abnormality 4.8.1 Indoor Fan Motor Abnormality (FXDQ, FXHQ Models) Error Code Applicable FXDQ-M, FXHQ-M Models Method of Error This error is detected if there is no revolution detection signal output from the fan motor. Detection Error Decision When no revolutions can be detected even at the maximum output voltage to the fan...
Page 182 Troubleshooting by Error Code SiUS331708EA 4.8.2 Indoor Fan Motor Abnormality (FXSQ54TA, FXMQ15-54PB Models) Error Code Applicable FXSQ54TA, FXMQ15-54PB Models Method of Error Error from the current flow on the fan PCB Detection Error from the rotation speed of the fan motor in operation Error from the position signal of the fan motor Error from the current flow on the fan PCB when the fan motor starting operation Error Decision...
Page 183 SiUS331708EA Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn off the power and wait for 10 minutes. There is a Remove the foreign matter. foreign matter around the fan.
Page 184 Troubleshooting by Error Code SiUS331708EA Troubleshooting The resistance Replace the indoor fan among U, V, and W are unbalanced motor. or short circuited. Remove the signal connector from the fan motor and check the resistance (∗2). Between V and GND terminals, and between GND Replace the indoor fan and H...
Page 185: Blower Motor Not Running
SiUS331708EA Troubleshooting by Error Code Blower Motor Not Running Error Code Applicable FXTQ-TA Models Outline Error is issued if the indoor unit determines that the indoor fan motor cannot rotate, regardless of the rotation command from indoor unit. Error Decision Determining successive abnormalities Conditions Checks the rotation speed at 5-second intervals using the feedback of the fan motor.
Page 186: Indoor Fan Motor Status Abnormality
Troubleshooting by Error Code SiUS331708EA 4.10 Indoor Fan Motor Status Abnormality A6-20 Error Code Applicable FXTQ-TA Models Outline The indoor unit periodically receives control status information from the fan motor. Error is issued when the information shows abnormality. Error Decision If the information shows Power Limit or Temp Limit status, it will be deemed a MOTOR LIMIT Conditions abnormal operation.
Page 187: Low Indoor Airflow
SiUS331708EA Troubleshooting by Error Code 4.11 Low Indoor Airflow A6-21 Error Code Applicable FXTQ-TA Models Outline Error is issued if the indoor unit determines that the indoor fan motor rotation is insufficient, regardless of the rotation command from indoor unit. Error Decision Determining successive abnormalities Conditions...
Page 188: Swing Flap Motor Abnormality
Troubleshooting by Error Code SiUS331708EA 4.12 Swing Flap Motor Abnormality Error Code Applicable FXFQ, FXZQ-M, FXUQ-P, FXEQ-P, FXHQ-M, FXAQ-P Models Method of Error Utilizes ON/OFF of the limit switch when the motor turns. Detection Error Decision When ON/OFF of the micro-switch for positioning cannot be reversed even though the swing flap Conditions motor is energized for a specified amount of time (about 30 seconds).
Page 189 SiUS331708EA Troubleshooting by Error Code The relay cable has no Replace the power supply continuity. relay cable. When the airflow direction flap-cam mechanism is disconnected Replace the defective from the swing motor, swing motor. (∗2) operation is normal when turned ON again.
Page 190: Power Supply Voltage Abnormality
Troubleshooting by Error Code SiUS331708EA 4.13 Power Supply Voltage Abnormality Error Code Applicable FXSQ-TA, FXMQ-PB Models Method of Error Error is detected by checking the input voltage of the fan motor. Detection Error Decision When the input voltage of fan motor is 150 V or less, or 386 V or more. Conditions Supposed Defective power supply voltage.
Page 191: Blower Motor Stops For Over/Under Voltage
SiUS331708EA Troubleshooting by Error Code 4.14 Blower Motor Stops for Over/Under Voltage Error Code Applicable FXTQ-TA Models Outline The indoor unit periodically receives control status information from the fan motor. Error is issued when the information shows abnormality. Error Decision If the information shows Over/Under Voltage status, it will be deemed a MOTOR VOLTS abnormal Conditions operation.
Page 192: Electronic Expansion Valve Coil Abnormality, Dust Clogging
Troubleshooting by Error Code SiUS331708EA 4.15 Electronic Expansion Valve Coil Abnormality, Dust Clogging Error Code Applicable All indoor units Models Method of Error Electronic expansion valve coil conditions are checked via microcomputer. The electronic expansion valve main body is checked for dust clogging via microcomputer. Detection Error Decision Pin input for electronic expansion valve coil is abnormal when initializing microcomputer.
Page 193: Gas Furnace Abnormality
SiUS331708EA Troubleshooting by Error Code 4.16 Gas Furnace Abnormality AA-03 Error Code Applicable CXTQ-TA Models Method of Error Detects the error signal from the gas furnace when any error occurs on the gas furnace. The indoor Detection unit displays AA-03 for any sort of gas furnace abnormality. Error Decision The error status differs depending on each error code of the gas furnace.
Page 194: Drain Level Above Limit
Troubleshooting by Error Code SiUS331708EA 4.17 Drain Level Above Limit Error Code Applicable FXFQ, FXZQ, FXUQ-P, FXEQ-P, FXDQ-M, FXSQ-TA, FXMQ-PB Models Method of Error Water leakage is detected based on float switch ON/OFF operation while the compressor is not in Detection operation.
Page 195: Capacity Determination Device Abnormality
SiUS331708EA Troubleshooting by Error Code 4.18 Capacity Determination Device Abnormality Error Code Applicable All indoor units Models Method of Error Capacity is determined according to resistance of the capacity setting adaptor and the memory Detection inside the IC memory on the indoor unit PCB, and whether the value is normal or abnormal is determined.
Page 196: Transmission Abnormality (Between Indoor Unit Pcb And Fan Pcb)
Troubleshooting by Error Code SiUS331708EA 4.19 Transmission Abnormality (between Indoor Unit PCB and Fan PCB) Error Code Applicable FXSQ-TA, FXMQ-PB Models Method of Error Transmission conditions between the indoor unit main PCB (A1P) and fan PCB (A2P) are checked via microcomputer. Detection Error Decision When normal transmission is not carried out for a certain duration.
Page 197 SiUS331708EA Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Is the connector between indoor unit PCB (A1P) and fan Connect the connector accurately. PCB (A2P) accurately connected? (∗1) Confirm the condition of transmission on indoor unit...
Page 198: Blower Motor Communication Error
Troubleshooting by Error Code SiUS331708EA 4.20 Blower Motor Communication Error C1-07 Error Code Applicable FXTQ-TA Models Outline Error is issued if transmission abnormalities occur between indoor unit and fan motor. Error Decision If the response message from the fan motor is an abnormal message, and determined as such by Conditions the indoor unit, the indoor unit will execute a retry.
Page 199: Climate Talk Communication Error
SiUS331708EA Troubleshooting by Error Code 4.21 Climate Talk Communication Error C1-08 Error Code Applicable CXTQ-TA Models Method of Error Monitors the communication with the gas furnace connected to the Climate Talk Communication Detection terminal. Error Decision The error decision is made when the communication with the gas furnace is lost after once the initial setting for communication with the gas furnace completes.
Page 200: Thermistor Abnormality
Troubleshooting by Error Code SiUS331708EA 4.22 Thermistor Abnormality C4, C5, C9, CA Error Code Applicable C4, C5: All indoor units C9: except FXTQ-TA and CXTQ-TA models Models CA: FXMQ-PB models only Method of Error The error is determined by the temperature detected by the thermistor. Detection Error Decision The thermistor becomes disconnected or shorted while the unit is running.
Page 201: Combination Abnormality (Between Indoor Unit Pcb And Fan Pcb)
SiUS331708EA Troubleshooting by Error Code 4.23 Combination Abnormality (between Indoor Unit PCB and Fan PCB) Error Code Applicable FXSQ-TA, FXMQ-PB Models Method of Error Transmission conditions with the fan PCB (A2P) are checked using the indoor unit PCB (A1P). Detection Error Decision When the communication data of fan PCB (A2P) is determined as incorrect Conditions...
Page 202: Blower Motor Hp Mismatch
Troubleshooting by Error Code SiUS331708EA 4.24 Blower Motor HP Mismatch C6-01 Error Code Applicable FXTQ-TA Models Outline Error is issued if the manufacturer ID and output of the connected fan motor do not match those recognized by the indoor unit. Error Decision Gathers information on the manufacturer ID and output of the fan motor when initializing the fan Conditions...
Page 203: Indoor Blower Does Not Have Required Parameters To Function
SiUS331708EA Troubleshooting by Error Code 4.25 Indoor Blower Does Not Have Required Parameters to Function C6-02 Error Code Applicable FXTQ-TA Models Outline Indoor units perform required settings for control on the fan motor, but if the minimum required settings are not made then information indicating as such will be included among the periodic control status information.
Page 204: Remote Sensor Abnormality
Troubleshooting by Error Code SiUS331708EA 4.26 Remote Sensor Abnormality Error Code Applicable FXTQ-TA, CXTQ-TA Models Method of Error The error is detected by remote sensor temperature. Detection Error Decision The remote sensor becomes disconnected or shorted while the unit is running. Conditions Supposed Defective indoor unit thermistor (R1T) for room temperature...
Page 205: Humidity Sensor System Abnormality
SiUS331708EA Troubleshooting by Error Code 4.27 Humidity Sensor System Abnormality Error Code Applicable FXFQ Models Method of Error Even if an error occurs, operation still continues. Detection Error is detected according to the moisture (output voltage) detected by the moisture sensor. Error Decision When the moisture sensor is disconnected or short circuited Conditions...
Page 206: Infrared Presence/Floor Sensor Error
Troubleshooting by Error Code SiUS331708EA 4.28 Infrared Presence/Floor Sensor Error Error Code Applicable FXFQ-T, FXUQ-P Models Method of Error The contents of a failure vary with the detailed error code. Check the code and proceed with the Detection flowchart. Error Decision Error is detected based on sensor output signals Conditions Supposed...
Page 207 SiUS331708EA Troubleshooting by Error Code Troubleshooting Diagnosis procedure 1 Infrared presence sensor error (Error code CE-01) Is the connection of the connector on infrared presence sensor Connect the connector correctly. PCB (A4P) and the connector (∗1) on A2P normal? Is the connection of the Connect the connector correctly.
Page 208 Troubleshooting by Error Code SiUS331708EA Troubleshooting Diagnosis procedure 2 Infrared floor sensor error (Error code CE-02) Is the connection of the connector on infrared floor sensor PCB Connect the connector correctly. (A3P) and the connector (∗1) on A2P normal? Is the connection of the Connect the connector correctly.
Page 209 SiUS331708EA Troubleshooting by Error Code Troubleshooting Diagnosis procedure 3 Infrared floor sensor error (Error code CE-03) Is the connection of the connector on infrared floor sensor PCB Connect the connector correctly. (A3P) and the connector (∗1) on A2P normal? Is the connection of the Connect the connector correctly.
Page 210 Troubleshooting by Error Code SiUS331708EA Troubleshooting Diagnosis procedure 4 Infrared floor sensor error (Error code CE-04) Is the connection of the connector on infrared floor sensor PCB Connect the connector correctly. (A3P) and the connector (∗1) on A2P normal? Is the connection of the Connect the connector correctly.
Page 211: Remote Controller Thermistor Abnormality
SiUS331708EA Troubleshooting by Error Code 4.29 Remote Controller Thermistor Abnormality Error Code Applicable All indoor units Models Method of Error Error detection is carried out by the temperature detected by the remote controller thermistor. Detection Error Decision When the remote controller thermistor becomes disconnected or shorted while the unit is running. ∗...
Page 212: Outdoor Main Pcb Abnormality
Troubleshooting by Error Code SiUS331708EA 4.30 Outdoor Main PCB Abnormality Error Code Applicable All outdoor units Models Method of Error Abnormality is detected under the communication conditions in the hardware section between the Detection indoor unit and outdoor unit. Error Decision When the communication conditions in the hardware section between the indoor unit and the Conditions outdoor unit are not normal.
Page 213: Activation Of High Pressure Switch
SiUS331708EA Troubleshooting by Error Code 4.31 Activation of High Pressure Switch Error Code Applicable All outdoor units Models Method of Error Abnormality is detected when the contact of the high pressure protection switch opens. Detection Use the protection device circuit to test high pressure switch conduction. Error Decision Error is generated when the high pressure switch activation count reaches the number specific to Conditions...
Page 214 Troubleshooting by Error Code SiUS331708EA Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check for the points shown below. (1) Is the stop valve open? (2) Is the high pressure switch connector properly connected to the main PCB? (3) Does the high pressure switch have continuity? Are the three points...
Page 215: Activation Of Low Pressure Sensor
SiUS331708EA Troubleshooting by Error Code 4.32 Activation of Low Pressure Sensor Error Code Applicable All outdoor units Models Method of Error Abnormality is detected by the pressure value with the low pressure sensor. Detection Use the outdoor main PCB to determine the low pressure sensor pressure test value. Error Decision Error is generated when the low pressure drops below a specific pressure level.
Page 216 Troubleshooting by Error Code SiUS331708EA Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Is the stop Open the stop valve. valve open? Is the indoor unit failing? (Does the remote controller Eliminate the indoor unit error.
Page 217: Inverter Compressor Motor Lock
SiUS331708EA Troubleshooting by Error Code 4.33 Inverter Compressor Motor Lock Error Code Applicable All outdoor units Models Method of Error PCB takes the position signal from UVW line connected between the inverter and compressor, and Detection the error is detected when any abnormality is observed in the phase-current waveform. Error Decision This error will be output when the inverter compressor motor does not start up even in forced Conditions...
Page 218 Troubleshooting by Error Code SiUS331708EA Troubleshooting insulation resistance Replace the compressor. is low (i.e., not more than 100 kΩ.) Power OFF Check the compressor motor coil for any broken wire. Some phase has a broken wire. Restart the compressor, and then End of work check whether or not Defective pressure...
Page 219: Outdoor Fan Motor Abnormality
SiUS331708EA Troubleshooting by Error Code 4.34 Outdoor Fan Motor Abnormality Error Code Applicable All outdoor units Models Method of Error The fan motor circuit error is detected based on the rotation frequency detected by Hall IC during Detection the fan motor operation. Error Decision In the condition of fan motor rotation, the number of rotation is below the fixed number for more Conditions...
Page 220 Troubleshooting by Error Code SiUS331708EA Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Is the voltage between L1 and N of power terminal board Calibrate the power voltage. X1M within the power supply If L1 and N phases are voltage ±10%?
Page 221: Electronic Expansion Valve Coil Abnormality
SiUS331708EA Troubleshooting by Error Code 4.35 Electronic Expansion Valve Coil Abnormality Error Code Applicable All outdoor units Models Method of Error Check continuity of electronic expansion valve coil. Detection Error Decision No current is detected in the common (COM [+]) when power supply is ON. Conditions Supposed Defective electronic expansion valve coil...
Page 222: Discharge Pipe Temperature Abnormality
Troubleshooting by Error Code SiUS331708EA 4.36 Discharge Pipe Temperature Abnormality Error Code Applicable All outdoor units Models Method of Error Abnormality is detected according to the temperature detected by the discharge pipe thermistor. Detection Error Decision The discharge pipe temperature rises to an abnormally high level. Conditions The discharge pipe temperature rises suddenly.
Page 223: Thermistor Abnormality
SiUS331708EA Troubleshooting by Error Code 4.37 Thermistor Abnormality H9, J3, J5, J6, J7, J9 Error Code Applicable All outdoor units Models Method of Error Error is detected from the temperature detected by the thermistor (∗1). Detection Error Decision When the thermistor has short circuit or open circuit Conditions Supposed Defective thermistor...
Page 224: High Pressure Sensor Abnormality
Troubleshooting by Error Code SiUS331708EA 4.38 High Pressure Sensor Abnormality Error Code Applicable All outdoor units Models Method of Error Error is detected from the pressure detected by the high pressure sensor. Detection Error Decision The high pressure sensor is short circuit or open circuit. Conditions Pressure range: 0-4.3 MPa (0-624 psi) Supposed...
Page 225: Low Pressure Sensor Abnormality
SiUS331708EA Troubleshooting by Error Code 4.39 Low Pressure Sensor Abnormality Error Code Applicable All outdoor units Models Method of Error Error is detected from pressure detected by low pressure sensor. Detection Error Decision The low pressure sensor is short circuit or open circuit. Conditions Pressure range: 0-1.7 MPa (0-247 psi) Supposed...
Page 226: Pcb (For Inverter Compressor) Abnormality
Troubleshooting by Error Code SiUS331708EA 4.40 PCB (for Inverter Compressor) Abnormality Error Code Applicable All outdoor units Models Method of Error Error is detected based on the current value during waveform output before starting compressor. Detection Error is detected based on the value from current sensor during synchronous operation when starting the unit.
Page 227: Radiation Fin Temperature Rise Abnormality
SiUS331708EA Troubleshooting by Error Code 4.41 Radiation Fin Temperature Rise Abnormality Error Code Applicable All outdoor units Models Method of Error The radiation fin temperature is detected by the radiation fin thermistor. Detection Error Decision The radiation fin temperature exceeds a certain temperature. Conditions Supposed Activation of radiation fin thermistor...
Page 228: Inverter Compressor Instantaneous Overcurrent
Troubleshooting by Error Code SiUS331708EA 4.42 Inverter Compressor Instantaneous Overcurrent Error Code Applicable All outdoor units Models Method of Error Error is detected from current flowing in the power transistor. Detection Error Decision An excessive current flows in the power transistor. Conditions Supposed Defective compressor coil (disconnected, defective insulation)
Page 229: Inverter Compressor Overcurrent
SiUS331708EA Troubleshooting by Error Code 4.43 Inverter Compressor Overcurrent Error Code Applicable All outdoor units Models Method of Error Error is detected by current flowing in the power transistor. Detection Error Decision Overload in the compressor is detected. Conditions Supposed Compressor overload Causes Broken wire inside compressor...
Page 230: Inverter Compressor Startup Abnormality
Troubleshooting by Error Code SiUS331708EA 4.44 Inverter Compressor Startup Abnormality Error Code Applicable All outdoor units Models Method of Error Error is detected by the power transistor current Detection Error Decision Compressor overload during activation. Conditions Supposed Defective compressor Causes Large pressure difference before starting the compressor Defective PCB Troubleshooting...
Page 231: Transmission Error (Between Microcomputers On The Outdoor Main Pcb)
SiUS331708EA Troubleshooting by Error Code 4.45 Transmission Error (Between Microcomputers on the Outdoor Main PCB) Error Code Applicable All outdoor units Models Method of Error Transmission conditions between microcomputers on the outdoor main PCB are tested via Detection microcomputer. Error Decision No normal transmission after a certain period of time Conditions Supposed...
Page 232: Inverter Circuit Capacitor High Voltage
Troubleshooting by Error Code SiUS331708EA 4.46 Inverter Circuit Capacitor High Voltage Error Code Applicable All outdoor units Models Method of Error The voltage waveform of the main circuit capacitor of the inverter is used to check for errors. Detection Error Decision The above-mentioned voltage waveform looks like the waveform of the power supply with a Conditions missing phase...
Page 233: Radiation Fin Thermistor Abnormality
SiUS331708EA Troubleshooting by Error Code 4.47 Radiation Fin Thermistor Abnormality Error Code Applicable All outdoor units Models Method of Error Resistance of the following thermistor is detected when the compressor is not operating. Detection (1) Radiation fin thermistor (2) PCB circuit thermistor Error Decision When the resistance value of thermistor becomes a value equivalent to open circuited or short circuited status...
Page 234: Refrigerant Shortage
Troubleshooting by Error Code SiUS331708EA 4.48 Refrigerant Shortage Error Code Applicable All outdoor units Models Method of Error Refrigerant shortage check is conducted based on the discharge pipe thermistor temperature and Detection the low-pressure saturated temperature. Error Decision Microcomputer is used to determine and check for system refrigerant shortage. ∗The unit can keep operating but there is an unconfirmed error.
Page 235 SiUS331708EA Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Is the low pressure less or equal to 0.25 MPa Is it cooling? Short of refrigerant, closed stop (36.3 psi)? valve, or blocked cooling system.
Page 236: Power Supply Insufficient Or Instantaneous Abnormality
Troubleshooting by Error Code SiUS331708EA 4.49 Power Supply Insufficient or Instantaneous Abnormality Error Code Applicable All outdoor units Models Method of Error The main circuit capacitor voltage of the inverter and the power supply voltage is checked. Detection Error Decision The main circuit capacitor of the tested inverter has abnormal voltage or the power supply voltage Conditions is abnormal.
Page 237 SiUS331708EA Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Is the power supply voltage between L1 and L2, Calibrate the power voltage. L2 and L3, and L1 and L3 within If L2 and Phase N are disconnected, 208 V –10% to 230 V replace the distribution box.
Page 238: Check Operation Not Executed
Troubleshooting by Error Code SiUS331708EA 4.50 Check Operation Not Executed Error Code Applicable All outdoor units Models Method of Error Determined based on whether check operation is executed or not Detection Error Decision Error is decided when the unit starts operation without check operation. Conditions Supposed Check operation not executed...
Page 239: Transmission Error Between Indoor Units And Outdoor Unit
SiUS331708EA Troubleshooting by Error Code 4.51 Transmission Error between Indoor Units and Outdoor Unit Error Code Applicable All indoor and outdoor units Models Method of Error Microcomputer checks if transmission between indoor and outdoor units is normal. Detection Error Decision When transmission is not carried out normally for a certain amount of time Conditions Supposed...
Page 240 Troubleshooting by Error Code SiUS331708EA Troubleshooting Outdoor unit PCB Replace the outdoor main microcomputer monitor PCB (A1P). (HAP) blinks. Operation ready lamp (H2P) is blinking. Lamp does not go off Press and hold the RESET for 12 minutes or (BS5) button on the outdoor more.
Page 241: Transmission Error Between Remote Controller And Indoor Unit
SiUS331708EA Troubleshooting by Error Code 4.52 Transmission Error between Remote Controller and Indoor Unit Error Code Applicable All indoor units Models Method of Error In case of controlling with 2 remote controllers, check the system using microcomputer if signal Detection transmission between indoor unit and remote controller (main and sub) is normal.
Page 242: Transmission Error Between Main And Sub Remote Controllers
Troubleshooting by Error Code SiUS331708EA 4.53 Transmission Error between Main and Sub Remote Controllers Error Code Applicable All indoor units Models Method of Error In case of controlling with 2 remote controllers, check the system using microcomputer if signal Detection transmission between indoor unit and remote controller (main and sub) is normal.
Page 243: Transmission Error Between Indoor And Outdoor Units In The Same System
SiUS331708EA Troubleshooting by Error Code 4.54 Transmission Error between Indoor and Outdoor Units in the Same System Error Code Applicable All indoor units Models Method of Error Error signal for the other indoor units is detected within the system by outdoor unit PCB. Detection Error Decision The error decision is made on any other indoor unit within the system concerned.
Page 244: Improper Combination Of Indoor And Outdoor Units, Indoor Units And Remote Controller
Troubleshooting by Error Code SiUS331708EA 4.55 Improper Combination of Indoor and Outdoor Units, Indoor Units and Remote Controller Error Code Applicable All indoor units Models Method of Error A difference occurs in data by the type of refrigerant between indoor and outdoor units. Detection The number of indoor units is out of the allowable range.
Page 245 SiUS331708EA Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Is the outdoor unit PCB replaced by the backup Check the model name of the PCB? outdoor unit PCB and then replace the old one.
Page 246: Incorrect Gas Furnace Connecting Number
Troubleshooting by Error Code SiUS331708EA 4.56 Incorrect Gas Furnace Connecting Number Error Code Applicable CXTQ-TA Models Outline Two or more "CXTQ + gas furnace" and other indoor units other than CXTQ are connected. Error Decision Check that two or more "CXTQ + gas furnace" and other indoor units other than CXTQ are not Conditions connected.
Page 247: Incorrect Electric Heater Capacity Setting
SiUS331708EA Troubleshooting by Error Code 4.57 Incorrect Electric Heater Capacity Setting UA-17 Error Code Applicable FXTQ-TA Models Outline After attaching optional electric heater, if the electric heater capacity setting (11(21)-5) is made mistakenly for heaters not featured in the lineup, heating via unintended levels of airflow will be prevented.
Page 248: Address Duplication Of Centralized Controller
Troubleshooting by Error Code SiUS331708EA 4.58 Address Duplication of Centralized Controller Error Code Applicable All indoor units Models Method of Error The principal indoor unit detects the same address as that of its own on any other indoor unit. Detection Error Decision The error decision is made as soon as the abnormality aforementioned is detected.
Page 249: Transmission Error Between Centralized Controller And Indoor Unit
SiUS331708EA Troubleshooting by Error Code 4.59 Transmission Error between Centralized Controller and Indoor Unit Error Code Applicable All indoor units Models intelligent Touch Controller Centralized controller Method of Error Microcomputer checks if transmission between indoor unit and centralized controller is normal. Detection Error Decision When transmission is not carried out normally for a certain amount of time...
Page 250 Troubleshooting by Error Code SiUS331708EA Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check the indoor unit for which UE is displayed. Is the Go to the next page. transmission error (UE) caused on all indoor units?
Page 251 SiUS331708EA Troubleshooting by Error Code Troubleshooting Check the transmission wiring between Abnormal centralized controller for Correct the wiring. any broken wire. CHECK 15 Normal Check transmission wiring with the master Abnormal Correct the wiring. centralized controller for any broken wire. CHECK 15 Normal Has the...
Page 252: System Not Set
Troubleshooting by Error Code SiUS331708EA 4.60 System Not Set Error Code Applicable All indoor units All outdoor units Models Method of Error On check operation, the number of indoor units in terms of transmission is not corresponding to that Detection of indoor units that have made changes in temperature.
Page 253: System Abnormality, Refrigerant System Address Undefined
SiUS331708EA Troubleshooting by Error Code 4.61 System Abnormality, Refrigerant System Address Undefined Error Code Applicable All indoor units Models All outdoor units Method of Error An indoor unit without automatically set address is detected. Detection Error Decision The error decision is made as soon as the abnormality aforementioned is detected. Conditions Supposed Improper connection of transmission wiring between indoor-outdoor units...
Page 254 Troubleshooting by Error Code SiUS331708EA Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Does electricity an error being introduced occur even after for the first time after 12 minutes elapses installation or after an indoor from the time when Normal...
Page 255: Climate Talk Communication System Combination Error (Before Initial Setting For Communication Completes)
SiUS331708EA Troubleshooting by Error Code 4.62 Climate Talk Communication System Combination Error (Before Initial Setting for Communication Completes) UH-05 Error Code Applicable CXTQ-TA Models Method of Error Detects the type of the devices constituted in Climate Talk Communication. Detection Error Decision The error decision is made when any of the following conditions is established before elapsing 4 minutes after the power is turned on.
Page 256: Climate Talk Communication System Combination Error (After Initial Setting For Communication Completes)
Troubleshooting by Error Code SiUS331708EA 4.63 Climate Talk Communication System Combination Error (After Initial Setting for Communication Completes) UH-06 Error Code Applicable CXTQ-TA Models Method of Error Detects the type of the devices constituted in Climate Talk Communication. Detection Error Decision The error decision is made when any of the following conditions is established once the initial setting for communication with the gas furnace completes and after elapsing 4 minutes after the Conditions...
Page 257: Defective Pcb
SiUS331708EA Troubleshooting by Error Code 4.64 Defective PCB Error Code Applicable Centralized controller Models intelligent Touch Controller Schedule timer Method of Error DIII-NET polarity circuit defective conditions are used to detect the error. Detection Error Decision The test detects both positive polarity and negative polarity. Conditions Supposed Defective centralized controller PCB...
Page 258: Transmission Error (Between Centralized Controllers)
Troubleshooting by Error Code SiUS331708EA 4.65 Transmission Error (between Centralized Controllers) Error Code Applicable Centralized controller Models intelligent Touch Controller Schedule timer Method of Error DIII-NET communication data is used to detect the error. (Automatic reset) Detection Error Decision When the slave centralized controller is activated, there is no master centralized controller. Conditions The previously connected centralized controller is not responding.
Page 259 SiUS331708EA Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Is the centralized controller No. changed? Reset the power supply of (Number of centralized all the centralized controllers removed controllers.
Page 260: Poor Centralized Controller Combination
Troubleshooting by Error Code SiUS331708EA 4.66 Poor Centralized Controller Combination Error Code Applicable Centralized controller Models intelligent Touch Controller Schedule timer Method of Error DIII-NET communication data is used to detect the error. Detection Error Decision There are other centralized controllers but the schedule timer is set for individual use. Conditions There are multiple master centralized controllers.
Page 261 SiUS331708EA Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. The remote control adaptor (KRP2A series) Not available for combined use with is connected. remote control adaptor. Dismount the remote control adaptor, and then reset the power supply of all the centralized controllers.
Page 262: Address Duplication, Poor Setting
Troubleshooting by Error Code SiUS331708EA 4.67 Address Duplication, Poor Setting Error Code Applicable Centralized controller Models intelligent Touch Controller Schedule timer Method of Error DIII-NET communication data is used to detect the error. Detection Error Decision Multiple centralized controllers or intelligent Touch Controllers are connected, and the controllers Conditions are both set as master centralized controllers or slave centralized controllers.
Page 263 SiUS331708EA Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Is this the first test operation result using the intelligent Touch Controller? Is the master/slave setting of the centralized controller correct? Master/slave...
Page 264: Operation Lamp Blinking
Troubleshooting by Error Code SiUS331708EA 4.68 Operation Lamp Blinking Error Code Applicable ON/OFF controller Models All indoor units Method of Error DIII-NET communication data is used to detect the error. Detection Error Decision Conditions Supposed Defective transmission between the centralized controller and an indoor unit Causes Loosened setting connector of the master centralized controller Defective ON/OFF controller PCB...
Page 265 SiUS331708EA Troubleshooting by Error Code Troubleshooting Does the indoor all the indoor unit on which the error units experiencing Correct the setting of occurred set the transmission the group No. group No.? failure? Replace the centralized controller PCB. Is the master centralized controller Correct the wiring.
Page 266: Central Control Indicator Lamp Blinking (One Blink)
Troubleshooting by Error Code SiUS331708EA 4.69 Central Control Indicator Lamp Blinking (One blink) Error Code Applicable ON/OFF controller Models Centralized controller Method of Error DIII-NET communication data is used to detect the error. Detection Error Decision The previously connected centralized controller is not responding. Conditions Control range duplication There are multiple master centralized controllers.
Page 267 SiUS331708EA Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Are any connected centralized Concurrently reset the controllers removed or the power supply of all the address changed? centralized controllers.
Page 268 Troubleshooting by Error Code SiUS331708EA Troubleshooting Does the ON/OFF Do two or controller control range more ON/OFF controllers Modify the setting of the switch have duplicate connect? ON/OFF controller control setting? range setting switch. Reset the power supply of the ON/OFF controller. Does the remote control adaptor Not available for combined use with...
Page 269: Central Control Indicator Lamp Blinking (Two Blinks)
SiUS331708EA Troubleshooting by Error Code 4.70 Central Control Indicator Lamp Blinking (Two blinks) Error Code Applicable ON/OFF controller Models Method of Error DIII-NET communication data is used to detect the error. Detection Error Decision The indoor unit has no centralized control address set Conditions No indoor unit within the control range Supposed...
Page 270: Check
Check SiUS331708EA 5. Check High Pressure Check CHECK 1 Referring to the Fault Tree Analysis (FTA) shown below, probe the defective points. ←Check to be sure the stop valve is open. Stop valve closed Local High pipe ←Conduct visual checks for pipe conditions. pressure Bent or crashed pipe resistance...
Page 271: Low Pressure Check
SiUS331708EA Check Low Pressure Check CHECK 2 Referring to the Fault Tree Analysis (FTA) shown below, probe the defective points. [In cooling] Defective low pressure ←Is the pressure value checked with the Service Checker sensor Defective (∗1.) corresponding to the measurement value of the pressure sensor? compressor Defective ←Are the voltage characteristics normal?
Page 272: Superheat Operation Check
Check SiUS331708EA Superheat Operation Check CHECK 3 Referring to the Fault Tree Analysis (FTA) shown below, probe the defective points. Hot gas circuit clogging Defective hot Defective solenoid ← Are the coil resistance and insulation normal? gas bypass valve coil control Defective solenoid valve body...
Page 273: Power Transistor Check
SiUS331708EA Check Power Transistor Check CHECK 4 Perform the following procedures prior to check. (1) Power OFF. (2) Remove all the wiring connected to the PCB where power transistors are mounted on. * Preparing a multimeter in the analog system is [Preparation] recommended.
Page 274: Refrigerant Overcharge Check
Check SiUS331708EA Refrigerant Overcharge Check CHECK 6 In case of VRV Systems, the only way to judge as the overcharge of refrigerant is with operating conditions due to the relationship to pressure control and electronic expansion valve control. As information for making a judgment, refer to the information below. Diagnosis of overcharge of refrigerant 1.
Page 275: Refrigerant Shortage Check
SiUS331708EA Check Refrigerant Shortage Check CHECK 7 In case of VRV Systems, the only way to judge as the shortage of refrigerant is with operating conditions due to the relationship to pressure control and electronic expansion valve control. As information for making a judgment, refer to the information below. Diagnosis of shortage of refrigerant 1.
Page 276: Vacuuming And Dehydration Procedure
Check SiUS331708EA Vacuuming and Dehydration Procedure CHECK 8 Conduct vacuuming and dehydration in the piping system following the procedure for Normal vacuuming and dehydration described below. Furthermore, if moisture may get mixed in the piping system, follow the procedure for Special vacuuming and dehydration described below.
Page 277: List Of Inverter-Related Error Codes
SiUS331708EA Check List of Inverter-Related Error Codes CHECK 9 Code Name Condition for determining error Major cause Instantaneous overcurrent of • Inverter output current exceeds 59.1 A even • Liquid sealing inverter compressor instantaneously. • Defective compressor • Defective inverter PCB Overcurrent of inverter •...
Page 278: Concept Of Inverter-Related Error Codes
Check SiUS331708EA Concept of Inverter-Related Error Codes CHECK 10 Transmission error When transmissions between the microcomputers on the main PCB are not normal Instantaneous overcurrent of inverter compressor (When inverter output current exceeds 59.1 A even instantaneously) Overcurrent of inverter compressor (1) A current of 33.5 A or more continues for a period of consecutive 5 seconds.
Page 279: Thermistor Check
SiUS331708EA Check 5.10 Thermistor Check CHECK 11 Thermistor type of indoor units Indoor heat exchanger Indoor heat exchanger Suction air thermistor Discharge air thermistor (liquid) thermistor (gas) thermistor Model FXFQ-T Type C – Type J FXFQ-P Type D – FXZQ-TA Type A –...
Page 280 Check SiUS331708EA Table 2 Thermistor temperature Resistance (kΩ) (°C) (°F) Type A Type B Type C Type D Type E –30 –22 363.8 361.7719 – 336.7 362.4862 –25 –13 266.8 265.4704 – 253.1 265.9943 –20 –4 197.8 196.9198 – 191.2 197.3083 –15 148.2...
Page 281 SiUS331708EA Check Thermistor temperature Resistance (kΩ) (°C) (°F) Type F Type G Type H Type J Type K –30 –22 354.1 4759 3257.371 359.8518 350.6 –25 –13 259.7 3454 2429.222 265.0699 257.4 –20 –4 192.6 2534 1827.883 197.1476 191.0 –15 144.2 1877 1387.099...
Page 282: Pressure Sensor Check
Check SiUS331708EA 5.11 Pressure Sensor Check CHECK 12 4.15 4.15 Detected Pressure (MPa) = × V – × 0.5 (psi) (kg/cm (MPa) (MPa) = × V – × 0.5 51.0 5.0 1 MPa = 145 psi : High pressure (MPa) 45.9 : Low pressure (MPa) High Pressure (P...
Page 283: Master Unit Centralized Connector Setting Table
SiUS331708EA Check 5.12 Master Unit Centralized Connector Setting Table CHECK 13 The master unit centralized setting connector (CN1/X1A) is installed at the factory. • To independently use a single unit of the intelligent Touch Controller or a single unit of the centralized remote controller, do not dismount the master unit centralized setting connector (i.e., use the connector with the factory setting unchanged).
Page 284: Master/Slave Unit Setting Table
Check SiUS331708EA 5.13 Master/Slave Unit Setting Table CHECK 14 Combination of intelligent Touch Controller and Centralized Remote Controller Master Slave ∗ Pattern Master/ Master/ Master/ Master/ 1-00~4-15 5-00~8-15 1-00~4-15 5-00~8-15 Slave Slave Slave Slave Master Master Slave Slave Master — —...
Page 285: Broken Wire Check Of The Relay Wires
SiUS331708EA Check 5.14 Broken Wire Check of the Relay Wires CHECK 15 Procedure for checking indoor-outdoor unit transmission wiring for broken wires Turn OFF the power supply to all equipment, short circuit between the indoor-outdoor unit terminal F1 and F2 in outdoor unit, and then conduct continuity checks between the transmission wiring F1 and F2 of "Indoor Unit a"...
Page 286: Fan Motor Connector Check
Check SiUS331708EA 5.15 Fan Motor Connector Check CHECK 16 (1) Turn OFF the power supply. (2) Remove the connector (X106A, X107A) on the PCB to measure the resistance value. Judgment criteria: resistance value between each phase is within ±20% Connector for signal wires (X106A, X107A) 1 White 2 Orange...
Page 287 SiUS331708EA Check FXDQ-M, FXHQ-M, FXLQ-M, FXNQ-M, FXMQ-MF Blue Brown Orange Judgment criteria Measuring points 300 Ω White-Orange 150 Ω White-Red 300 Ω Yellow-Blue 150 Ω Yellow-Brown Yellow Red White RXSQ24/36TAVJU Measure the connector pin-to-pin resistance and make sure that the resistance value is within the range listed in the table below.
Page 288 SiUS331708EA Part 7 Appendix 1. Wiring Diagrams..................276 1.1 Outdoor Unit ..................... 276 1.2 Indoor Unit....................279 1.3 Air Treatment Equipment ................. 294 Appendix...
Page 289: Wiring Diagrams
SiUS331708EA Wiring Diagrams 1. Wiring Diagrams Outdoor Unit RXSQ24/36TAVJU Appendix...
Page 290 Wiring Diagrams SiUS331708EA RXSQ48TAVJU Appendix...
Page 291 SiUS331708EA Wiring Diagrams RXSQ60TAVJU Appendix...
Page 292: Indoor Unit
Wiring Diagrams SiUS331708EA Indoor Unit FXFQ07/09/12/15/18/24/30/36/48TVJU Appendix...
Page 293 SiUS331708EA Wiring Diagrams BYCQ125BGW1 (Self-Cleaning Decoration Panel for FXFQ-TVJU) Appendix...
Page 294 Wiring Diagrams SiUS331708EA FXFQ09/12/18/24/30/36/48PVJU Appendix...
Page 295 SiUS331708EA Wiring Diagrams FXZQ05/07/09/12/15/18TAVJU Appendix...
Page 296 Wiring Diagrams SiUS331708EA FXZQ07/09/12/15/18MVJU9 Appendix...
Page 297 SiUS331708EA Wiring Diagrams FXUQ18/24/30/36PVJU Appendix...
Page 298 Wiring Diagrams SiUS331708EA FXEQ07/09/12/15/18/24PVJU Appendix...
Page 299 SiUS331708EA Wiring Diagrams FXDQ07/09/12/18/24MVJU Appendix...
Page 300 Wiring Diagrams SiUS331708EA FXSQ05/07/09/12/15/18/24/30/36/48/54TAVJU Appendix...
Page 301 SiUS331708EA Wiring Diagrams FXMQ07/09/12/15/18/24/30/36/48/54PBVJU Appendix...
Page 302 Wiring Diagrams SiUS331708EA FXHQ12/24/36MVJU Appendix...
Page 303 SiUS331708EA Wiring Diagrams FXAQ07/09/12/18/24PVJU Appendix...
Page 304 Wiring Diagrams SiUS331708EA FXLQ07/09/12/18/24MVJU, FXNQ07/09/12/18/24MVJU Appendix...
Page 305 SiUS331708EA Wiring Diagrams FXTQ09/12/18/24/30/36/42/48/54/60TAVJUA(D) (SEE NOTE 4) 208/230 GROUND LUG HEATER KIT (SEE NOTE 5) DISCONNECT SWITCH WIRING INSTALLING AUX ALARM (ALARM) (SEE NOTE 1) (SEE NOTE 6) (SEE NOTE 1) 24VAC 24VAC RELAY IN (ACC-IN) HEATER KIT RELAY OUT OUTPUT (ACC-OUT) TB10...
Page 306 Wiring Diagrams SiUS331708EA CXTQ24/36/48/60TASBLU Appendix...
Page 307: Air Treatment Equipment
SiUS331708EA Wiring Diagrams Air Treatment Equipment 1.3.1 Outdoor-Air Processing Unit FXMQ48/72MFVJU Appendix...
Page 308 Wiring Diagrams SiUS331708EA 1.3.2 Energy Recovery Ventilator (VAM Series) VAM300/470/600GVJU Appendix...
Page 309 SiUS331708EA Wiring Diagrams VAM1200GVJU Appendix...
Page 310 Revision History Month / Year Version Revised contents 08 / 2017 SiUS331708E First edition 09 / 2018 SiUS331708EA Model addition: FXZQ05-18TAVJU, FXSQ05-54TAVJU...
Page 311 Improper installation can result in water or refrigerant leakage, electrical shock, fire or explosion. Use only those parts and accessories supplied or specified by Daikin. Ask a qualified installer or contractor to install those parts and accessories. Use of unauthorized parts and accessories or improper installation of parts and accessories can result in water or refrigerant leakage, electrical shock, fire or explosion.

This manual is also suitable for:

Rxsq36tavju Rxsq48tavju Rxsq60tavju

Daikin RXSQ24TAVJU Service Manual

Part 1 General Information

1 Model Names of Indoor/Outdoor Units

2 External Appearance

3 Connection Ratio

Refrigerant Circuit Part 2

1 Refrigerant Circuit

2 Functional Parts Layout

Part 3 Remote Controller

1 Applicable Models

2 Names and Functions

3 Main/Sub Setting

4 Address Setting for Wireless Remote Controller

5 Centralized Control Group No. Setting

6 Service Mode

Part 4 Functions and Control

1 Operation Mode

2 Basic Control

3 Special Control

4 Protection Control

5 Other Control

6 Outline of Control (Indoor Unit)

Part 5 Field Settings and Test Operation

1 Field Settings from Remote Controller

2 Field Settings from Outdoor Unit

3 Test Operation

Part 6 Service Diagnosis

1 Servicing Items to be Confirmed

2 Symptom-Based Troubleshooting

3 Service Check Function

4 Troubleshooting by Error Code

5 Check

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Chapters

Troubleshooting

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Summary of Contents for Daikin RXSQ24TAVJU