Daikin VRV IV-S RXTQ-TAVJU Series Service Manual

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SiUS331604E

Service

Manual

RXTQ36/48/60TAVJU

Heat Pump 60 Hz

Table of Contents

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Table of Contents

Troubleshooting

Summary of Contents for Daikin VRV IV-S RXTQ-TAVJU Series

Page 1 SiUS331604E Service Manual RXTQ36/48/60TAVJU Heat Pump 60 Hz...
Page 2 SiUS331604E RXTQ-TAVJU Heat Pump R-410A 60 Hz ED Reference For items below, please refer to Engineering Data. Item ED No. Page Remarks EDUS391400-F14 FXFQ-T EDUS391000-F1 FXFQ-P EDUS391300-F9 FXZQ-M EDUS391437-F15 FXUQ-P EDUS391533-F16 FXEQ-P EDUS39-600-F2 FXDQ-M Specifications - Indoor Unit EDUS391503-F4 FXMQ-PB EDUS39-900A-F11 FXMQ-M EDUS39-600-F5...
Page 3 SiUS331604E EDUS391400-F14 FXFQ-T EDUS391000-F1 FXFQ-P EDUS391300-F9 FXZQ-M EDUS391437-F15 FXUQ-P EDUS391533-F16 FXEQ-P EDUS39-600-F2 FXDQ-M Option List - Indoor Unit EDUS391503-F4 FXMQ-PB EDUS39-900A-F11 FXMQ-M EDUS39-600-F5 FXHQ-M EDUS391100-F6 FXAQ-P EDUS391502-F7 FXLQ-M, FXNQ-M EDUS391000-F12 FXTQ-PA Option List - Outdoor Unit EDUS331608-R RXTQ-T Option List - Energy EDUS711116 VAM-G Recovery Ventilator...
Page 4: Table Of Contents
SiUS331604E 2. Names and Functions ................20 2.1 BRC1E73 ....................20 2.2 Wireless Remote Controller ............... 22 3. MAIN/SUB Setting..................23 3.1 BRC1E73 ....................23 3.2 Wireless Remote Controller ............... 24 4. Centralized Control Group No. Setting............25 4.1 BRC1E73 ....................25 4.2 Wireless Remote Controller ...............
Page 5 SiUS331604E 6.11 Heater Control (FXTQ) ................67 6.12 4 Step Thermostat Processing (FXTQ) ............69 6.13 Interlocked with External Equipment (FXTQ) ..........70 Part 5 Field Setting ................ 72 1. Test Operation ..................73 1.1 Check Work Prior to Turning Power Supply ON ........73 1.2 Turn Power ON ..................
Page 6 SiUS331604E 4. Troubleshooting by Error Code ............... 135 4.1 External Protection Device Abnormality ........... 135 4.2 Indoor Unit PCB Abnormality ..............136 4.3 Drain Level Control System (S1L) Abnormality........137 4.4 Indoor Fan Motor (M1F) Lock, Overload ..........139 4.5 Indoor Fan Motor Abnormality..............142 4.6 Overload/Overcurrent/Indoor Fan Motor Lock..........
Page 7 SiUS331604E 4.45 Improper Combination of Indoor and Outdoor Units, Indoor Units and Remote Controller......... 200 4.46 Address Duplication of Centralized Controller.......... 202 4.47 Transmission Error between Centralized Controller and Indoor Unit ..203 4.48 System not Set ..................206 4.49 System Abnormality, Refrigerant System Address Undefined ....207 4.50 Defective PCB ..................
Page 8 Safety Cautions SiUS331604E 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. Caution Items The caution items are classified into Warning and...
Page 9 SiUS331604E Safety Cautions Warning Do not turn the air conditioner on or off by plugging in or unplugging the power cable. Plugging or unplugging the power cable to operate the equipment may cause an electrical shock or fire. Be sure to wear a safety helmet, gloves, and a safety belt when working in a high place (more than 2 m (6.5 ft)).
Page 10 Safety Cautions SiUS331604E Caution 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. Conduct welding work in a well-ventilated place. Using a welder in an enclosed room may cause oxygen deficiency.
Page 11 SiUS331604E Safety Cautions Warning When wiring between the indoor and outdoor units, make sure that the terminal cover does not lift off or dismount because of the cable. If the cover is not mounted properly, the terminal connection section may cause an electrical shock, excessive heat generation or fire.
Page 12 Safety Cautions SiUS331604E Caution Do not install the equipment in a place where there is a possibility of combustible gas leaks. If combustible gas leaks and remains around the unit, it may cause a fire. Check to see if parts and wires are mounted and connected properly, and if the connections at the soldered or crimped terminals are secure.
Page 13 SiUS331604E 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: Part 1 General Information
SiUS331604E Part 1 General Information 1. Model Names of Indoor/Outdoor Units............2 1.1 Indoor Unit....................2 1.2 Air Treatment Equipment ................2 1.3 Outdoor Unit ....................2 2. External Appearance...................3 2.1 Indoor Unit....................3 2.2 Air Treatment Equipment ................4 2.3 Outdoor Unit ....................4 3.
Page 15: Model Names Of Indoor/Outdoor Units
SiUS331604E Model Names of Indoor/Outdoor Units 1. Model Names of Indoor/Outdoor Units Indoor Unit Capacity Range 0.6 ton 0.8 ton 1 ton 1.25 ton 1.5 ton 2 ton 2.5 ton 3 ton 3.5 ton 4 ton 4.5 ton 6 ton Power Supply, Standard Capacity Index Ceiling Mounted Cassette...
Page 16: External Appearance
External Appearance SiUS331604E 2. External Appearance Indoor Unit Ceiling mounted cassette (Round flow with sensing) type Ceiling mounted duct type FXMQ-M FXFQ-T Shown with BYCQ125B-W1 Ceiling mounted cassette (Round flow) type Ceiling suspended type FXFQ-P FXHQ-M Shown with BYCP125K-W1 4 way ceiling mounted cassette (2’×2’) type Wall mounted type FXZQ-M FXAQ-P...
Page 17: Air Treatment Equipment
SiUS331604E External Appearance Air Treatment Equipment Outdoor air processing unit Energy recovery ventilator (VAM series) FXMQ-MF VAM-G Outdoor Unit RXTQ36TAVJU, RXTQ48TAVJU RXTQ60TAVJU 3/4 ton 5 ton General Information...
Page 18: Capacity Range
Capacity Range SiUS331604E 3. Capacity Range Combination Ratio Total capacity index of the indoor units Combination ratio = Capacity index of the outdoor units Max. combination ratio Type Min. combination ratio Types of connected indoor units VRV indoor units Single outdoor units 130% Outdoor Unit Model Name...
Page 19: Part 2 Refrigerant Circuit
SiUS331604E Part 2 Refrigerant Circuit 1. Refrigerant Circuit ..................7 1.1 RXTQ36TAVJU .................... 7 1.2 RXTQ48TAVJU .................... 9 1.3 RXTQ60TAVJU ..................11 2. Functional Parts Layout ................13 2.1 RXTQ36TAVJU ..................13 2.2 RXTQ48TAVJU ..................14 2.3 RXTQ60TAVJU ..................16 Refrigerant Circuit...
Page 20: Refrigerant Circuit Part
Refrigerant Circuit SiUS331604E 1. Refrigerant Circuit RXTQ36TAVJU No. in piping Symbol Name Function diagram Inverter compressor is operated on frequencies between 36 Hz and 195 Hz 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 21 SiUS331604E Refrigerant Circuit Refrigerant Circuit...
Page 22: Rxtq48Tavju
Refrigerant Circuit SiUS331604E RXTQ48TAVJU No. in piping Symbol Name Function diagram Inverter compressor is operated on frequencies between 36Hz and 195Hz 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 23 SiUS331604E Refrigerant Circuit Refrigerant Circuit...
Page 24: Rxtq60Tavju
Refrigerant Circuit SiUS331604E RXTQ60TAVJU No. in piping Symbol Name Function diagram Inverter compressor is operated on frequencies between 36Hz and 195Hz 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 25 SiUS331604E Refrigerant Circuit Refrigerant Circuit...
Page 26: Functional Parts Layout
Functional Parts Layout SiUS331604E 2. Functional Parts Layout RXTQ36TAVJU Top view Low pressure sensor (S1NPL) High pressure sensor (S1NPH) Solenoid valve (Unload circuit) (Y3S) Front view Four way valve Solenoid valve (Hot gas) (Y1S) (Y2S) Thermistor (Outdoor air) (R1T) Thermistor (Discharge pipe) (R2T) Thermistor (Suction pipe 1) High pressure switch...
Page 27: Rxtq48Tavju
SiUS331604E Functional Parts Layout RXTQ48TAVJU 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) (S1PH) (R7T) High pressure sensor...
Page 28 Functional Parts Layout SiUS331604E Side view Four way valve coil (Y1S) Thermistor (Outdoor air) lead wire (R1T) Thermistor (Outdoor air) (R1T) R2T, R3T, R4T, R5T, R6T, Y1E, S1NPH, S1NPL lead wire R2T, R5T, R6T, S1NPH, S1NPL lead wire R4T, Y1E lead wire Thermistor (Suction pipe 1) R3T lead wire...
Page 29: Rxtq60Tavju
SiUS331604E Functional Parts Layout RXTQ60TAVJU Front view Four way valve coil Compresser motor lead wire (M1C) Four way valve coil (Y3S) Thermistor (Suction pipe 2) Four way valve lead wire (R5T) (Y1S) Thermistor (Discharge pipe) (R2T) Fan motor (Upper) lead wire High pressure sensor (M1F) lead wire...
Page 30 Functional Parts Layout SiUS331604E Side view Electronic expansion valve (Main) (Y1E), Electronic expansion valve (Subcooling) (Y3E), High pressure sensor (S1NPH), Low pressure sensor (S1NPL) lead wire Thermistor (Subcooling) (R6T) Thermistor (Suction pipe 1) (R3T) Thermistor (Outdoor air) (R1T) Electronic expansion valve/coil (Main) (Y1E) Electronic expansion...
Page 31: Part 3 Remote Controller
SiUS331604E Part 3 Remote Controller 1. Applicable Models ..................19 2. Names and Functions ................20 2.1 BRC1E73 ....................20 2.2 Wireless Remote Controller ............... 22 3. MAIN/SUB Setting..................23 3.1 BRC1E73 ....................23 3.2 Wireless Remote Controller ............... 24 4. Centralized Control Group No. Setting............25 4.1 BRC1E73 ....................
Page 32: Applicable Models
Applicable Models SiUS331604E 1. Applicable Models Wired remote controller Wireless remote Series controller Navigation FXFQ – FXZQ BRC7E830 FXUQ – FXEQ FXDQ BRC4C82 FXMQ BRC1E73 FXHQ BRC7E83 FXAQ BRC7E818 FXLQ FXNQ – FXTQ Remote Controller...
Page 33: Names And Functions
SiUS331604E Names and Functions 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 34 Names and Functions SiUS331604E 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 35: Wireless Remote Controller
SiUS331604E 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 36: Main/Sub Setting
MAIN/SUB Setting SiUS331604E 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 37: Wireless Remote Controller
SiUS331604E MAIN/SUB Setting Wireless Remote Controller Introduction To set the wireless remote controller, you have to set the address for: The receiver of the wireless remote controller The wireless remote controller. Setting the Address for the Receiver The address for the receiver of the wireless remote controller is factory setting to 1. To change this setting, proceed as follows: Set the wireless address switch (SS2) on the PCB according to the table below.
Page 38: Centralized Control Group No. Setting
Centralized Control Group No. Setting SiUS331604E 4. 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 39 SiUS331604E 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 attached. NOTICE Enter the group No. and installation place of the indoor unit into the attached installation table. Be sure to keep the installation table with the operation manual for maintenance.
Page 40: Wireless Remote Controller
Centralized Control Group No. Setting SiUS331604E 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 41: Group No. Setting Example
SiUS331604E Centralized Control Group No. Setting Group No. Setting Example Centralized Remote Controller Indoor/Outdoor Outdoor/Outdoor Indoor/Outdoor Outdoor/Outdoor F1 F2 F1 F2 F1 F2 F1 F2 F1 F2 F1 F2 P1 P2 F1 F2 P1 P2 F1 F2 P1 P2 F1 F2 P1 P2 Group Control by Remote Controller Main 1-00...
Page 42: Service Mode
Service Mode SiUS331604E 5. Service Mode BRC1E73 Operating the remote controller allows service data to be acquired and various services to be set. Basic screen is displayed. Press the Cancel Press the button. Cancel Press and hold the Cancel button button for 4 seconds or more.
Page 43 SiUS331604E Service Mode Maintenance Menu Item 2 Remarks Indoor Unit Status 10.FLOAT 11.T1/T2 12.Unit No. Select the Unit No. you want to check. SkyAir 13.Th1 Suction air thermistor Suction air thermistor 14.Th2 Heat exchanger thermistor Heat exchanger liquid pipe thermistor 15.Th3 —...
Page 44: Part 4 Functions And Control
SiUS331604E Part 4 Functions and Control 1. Operation Mode ..................32 2. Basic Control..................... 33 2.1 Normal Operation ..................33 2.2 Compressor PI Control................34 2.3 Electronic Expansion Valve PI Control............35 2.4 Cooling Operation Fan Control..............36 3. Special Control..................37 3.1 Startup Control ...................
Page 45: Operation Mode
SiUS331604E 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 46: Basic Control
Basic Control SiUS331604E 2. Basic Control Normal Operation Cooling Operation Electric symbol Outdoor unit actuator Operation Remarks RXTQ36 RXTQ48 RXTQ60 TAVJU TAVJU TAVJU 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 47: Compressor Pi Control
SiUS331604E 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 48: Electronic Expansion Valve Pi Control
Basic Control SiUS331604E RXTQ36TAVJU RXTQ48/60TAVJU Step Frequency (Hz) Step Frequency (Hz) 52.5 52.5 61.5 61.5 67.5 85.5 100.5 112.5 118.5 115.5 121.5 128.1 145.5 163.5 154.5 163.5 181.5 178.5 196.5 211.5 223.5 232.5 244.5 253.5 253.5 265.5 277.5 289.5 301.5 ∗...
Page 49: Cooling Operation Fan Control
SiUS331604E 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 50: Special Control
Special Control SiUS331604E 3. Special Control Startup Control This control is used to equalize the pressure in the front and back 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 51 SiUS331604E Special Control 3.1.2 Startup Control in Heating Operation Thermostat ON Electric symbol Startup control Outdoor unit Pressure equalization control RXTQ36 RXTQ48 RXTQ60 actuator prior to startup STEP 1 STEP 2 TAVJU TAVJU TAVJU Increases 2 steps every 20 seconds from minimum frequency Compressor M1C M1C M1C 0 Hz...
Page 52: Oil Return Operation
Special Control SiUS331604E Oil Return Operation In order to prevent the compressor from running out of oil, oil return operation is conducted to recover oil that has flown 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 Pe : Low pressure sensor detection value Tc : High pressure equivalent saturation temperature...
Page 53 SiUS331604E 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 suction 1 thermistor Tb : Heat exchanger temperature Starting conditions Referring to the set conditions for the following items, start oil return operation in heating.
Page 54: Defrost Operation
Special Control SiUS331604E 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 suction 1 thermistor Tb : Heat exchanger temperature Defrost operation is performed to melt frost on the outdoor unit heat exchanger when heating, and thus recover heating capacity.
Page 55: Pump Down Residual Operation
SiUS331604E Special Control Pump down Residual Operation When activating the compressor, if liquid refrigerant remains in the heat exchanger, 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 heat exchanger when the compressor is down.
Page 56: Restart Standby
Special Control SiUS331604E 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 RXTQ36 RXTQ48 RXTQ60 TAVJU TAVJU...
Page 57: Protection Control
SiUS331604E 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 58 Protection Control SiUS331604E Heating operation High pressure drop Pc > 3.04 MPa (441 psi) High pressure not limited Pc: High pressure sensor detection value Pc < 2.89 MPa (419 psi) High pressure limited Compressor upper limit frequency: 1-step down from current compressor frequency After 10 sec.
Page 59: Low Pressure Protection Control
SiUS331604E 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 < 0.25 MPa > 0.39 MPa (36.3 psi) (56.6 psi) Low pressure...
Page 60: Discharge Pipe Protection Control
Protection Control SiUS331604E 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 protection HTdi: Value of compressor discharge pipe control not limited temperature (Tdi) compensated with outdoor air temperature •...
Page 61: Inverter Protection Control
SiUS331604E 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 ≤ 22 A •...
Page 62 Protection Control SiUS331604E 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 63: Other Control
SiUS331604E 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 64: Outline Of Control (Indoor Unit)
Outline of Control (Indoor Unit) SiUS331604E 6. Outline of Control (Indoor Unit) Operation Flow Chart Cooling Operation Start (Option) Turn ON Aux. electric : OFF 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 65 SiUS331604E Outline of Control (Indoor Unit) Program dry operation Heating Operation (option) Program ∗7 Drain dry display : OFF pump kit ∗8 Thermostat status Swing flap? : Operating ∗12 in L mode after it stops for 6 min. ∗12 Operating in L mode Set wind direction Swing flap Electronic...
Page 66: Set Temperature And Control Temperature
Outline of Control (Indoor Unit) SiUS331604E Set Temperature and Control Temperature 6.2.1 Without the Optional Infrared 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 67 SiUS331604E Outline of Control (Indoor Unit) 6.2.2 With the Optional Infrared 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). • •...
Page 68: Thermostat Control
Outline of Control (Indoor Unit) SiUS331604E Thermostat Control 6.3.1 Without the Optional Infrared 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). •...
Page 69 SiUS331604E Outline of Control (Indoor Unit) 6.3.2 With the Optional Infrared 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 ·...
Page 70 Outline of Control (Indoor Unit) SiUS331604E 6.3.3 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 refering to page 80 and later (Field Setting from Remote Controller).
Page 71: Operations Of Swing Flaps
SiUS331604E Outline of Control (Indoor Unit) Operations of Swing Flaps Flap FXFQ FXHQ FXAQ Swing Horizontal Horizontal Horizontal Hot start from defrosting operation Airflow direction set Horizontal Horizontal Horizontal Swing Horizontal Horizontal Horizontal Defrosting operation Airflow direction set Horizontal Horizontal Horizontal Swing Horizontal...
Page 72: Hot Start Control (In Heating Operation Only)
Outline of Control (Indoor Unit) SiUS331604E 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. Defrost ending or oil return ending Hot start ending conditions ·...
Page 73: Louver Control For Preventing Ceiling Dirt
SiUS331604E 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 74: Drain Pump Control
Outline of Control (Indoor Unit) SiUS331604E Drain Pump Control 6.7.1 Normal Operation Float switch Thermostat (running) Error display Drain pump 5 min. The float switch is OFF in normal operation. When cooling operation starts (thermostat ON), the drain pump turns ON simultaneously. After the thermostat turns OFF, the drain pump continues to operate for another 5 minutes.
Page 75 SiUS331604E Outline of Control (Indoor Unit) 6.7.3 If the Float Switch is ON with the Thermostat OFF in Cooling Operation Float switch Thermostat (running) Error display Drain pump 5 min. 5 sec. When the float switch turns ON, the drain pump turns ON simultaneously. If the float switch remains ON even after the residual operation of the drain pump has ended, the error code A3 is displayed on the remote controller.
Page 76: Electronic Expansion Valve Control
Outline of Control (Indoor Unit) SiUS331604E 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 77: Freeze-Up Prevention
SiUS331604E Outline of Control (Indoor Unit) 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 78 Outline of Control (Indoor Unit) SiUS331604E When the indoor unit is a round flow or multi flow type, if the air outlet is set as dual-directional or tri-directional, Note: 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 79: Heater Control (Optional Pcb Krp1B Series Is Required.)
SiUS331604E Outline of Control (Indoor Unit) 6.10 Heater Control (Optional PCB KRP1B series is required.) Heater control is conducted in the following manner. Normal control While in heating operation, heater control (ON/OFF) is Set temperature conducted as shown on the right. 2ºC 2ºC (3.6˚F)
Page 80: Heater Control (Fxtq)
Outline of Control (Indoor Unit) SiUS331604E 6.11 Heater Control (FXTQ) 6.11.1 Auxiliary Heater Control If heating is insufficient in heat pump system alone, an electrical heater is to be used as the auxiliary heater. The following shows the ON/OFF conditions for the electric heater. Fan H tap Thermostat OFF/Stop operation 120 seconds (∗2)
Page 81 SiUS331604E Outline of Control (Indoor Unit) 6.11.2 Heat Pump Lockout Mode During heating operation, users can select an electrical heater for heating. 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 heater as manual backup operation.
Page 82: Step Thermostat Processing (Fxtq)
Outline of Control (Indoor Unit) SiUS331604E Condition A • Heating mode • Thermostat step 1 = "ON" • Not during fan residual operation & • [Electrical heater setting] = "01" • [Electrical heater setting] = "03" & • Hot-water heater = "1" (ON) Condition B •...
Page 83: Interlocked With External Equipment (Fxtq)
SiUS331604E Outline of Control (Indoor Unit) 6.13 Interlocked with External Equipment (FXTQ) 6.13.1 Humidifier When a humidifier is connected onsite, the fan operates with the airflow rate set of the remote controller or with the H tap. • Remote control operation = ON &...
Page 84 Outline of Control (Indoor Unit) SiUS331604E 6.13.2 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 85: Part 5 Field Setting
SiUS331604E Part 5 Field Setting 1. Test Operation ..................73 1.1 Check Work Prior to Turning Power Supply ON ........73 1.2 Turn Power ON ..................73 1.3 Test Operation.................... 74 1.4 Error Codes and Corresponding Measures..........77 1.5 When Turning ON Power First Time ............79 1.6 When Turning ON Power the Second Time and Subsequent....
Page 86: Test Operation
Test Operation SiUS331604E 1. 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 87: Test Operation
SiUS331604E 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 88 Test Operation SiUS331604E 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 89 SiUS331604E 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 remote controllers connected here. Set the master unit as per customer's request.
Page 90: Error Codes And Corresponding Measures
Test Operation SiUS331604E Error Codes and Corresponding Measures Please check the remote controller connected to the indoor unit for verification. Error code Description Solution Primary code code High pressure switch activated (S1PH) Check the stop valve or (field) piping abnormality or the airflow on the air cooling heat exchanger.
Page 91 SiUS331604E Test Operation Error code Description Solution Primary code code Q1/Q2 or indoor-outdoor units wiring error Check (Q1/Q2) wiring. Q1/Q2 or indoor-outdoor units wiring error Check (Q1/Q2) wiring. System test operation ends abnormally. Re-execute the test operation. System mismatch Check if there are any other defective indoor Mismatched indoor unit models used (R-410A, units and verify if the indoor unit combination R-407C, RA, Hydrobox, etc.).
Page 92: When Turning On Power First Time
Test Operation SiUS331604E 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 error...
Page 93: Field Setting From Remote Controller
SiUS331604E Field Setting from Remote Controller 2. Field Setting 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 94 Field Setting from Remote Controller SiUS331604E Press Menu/OK button. Setting confirmation screen is displayed. <Setting confirmation screen> Select and press Menu/OK button. Setting details are determined and field settings screen returns. In the case of multiple setting changes, repeat “ ”...
Page 95: Wireless Remote Controller
SiUS331604E Field Setting 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 96: Setting Contents And Code No. For Indoor Units
Field Setting from Remote Controller SiUS331604E Setting Contents and Code No. for Indoor Units : Factory setting Mode First Description Second Code No. Details Code (∗2) 10(20) Filter contamination heavy/light Ultra Light Approx. Heavy Approx. — — (Setting for display time to clean air long life 10,000 5,000...
Page 97 SiUS331604E Field Setting from Remote Controller Details Mode First Description Second Code No. Code (∗2) 13(23) Setting of normal airflow — (19) (20) Selection of airflow direction F (4 directions) T (3 directions) W (2 — (Set when a sealing material kit has been installed.) directions) Swing pattern settings All direction...
Page 98 Field Setting from Remote Controller SiUS331604E 2.3.1 Detailed Explanation of Setting Modes (1) Filter Contamination Heavy/Light If switching the filter sign ON time, set as given in the table below. Second Code Standard Filter Long Life Filter Ultra Long Life Mode No.
Page 99 SiUS331604E Field Setting from Remote Controller (˚F) (˚C) 96.8 93.2 In cooling 89.6 Suction air Suction air Remote controller thermistor thermistor thermistor Suction air Suction air Remote controller 82.4 thermistor thermistor thermistor 78.8 75.2 71.6 (˚C) 62.6 66.2 69.8 73.4 80.6 84.2 87.8 91.4 98.6 (˚F)
Page 100 Field Setting from Remote Controller SiUS331604E When the unit is equipped with an infrared floor sensor: Mode No. Second Code No. First Code No. 10 (20) 11 (21) The thermistor to be used Remote controller thermistor — — — — Suction air thermistor —...
Page 101 SiUS331604E Field Setting from Remote Controller (6) Auxiliary Electric Heater ON/OFF Temperature Setting Thermostat Set temperature Thermostat <Ttsoff> <Ttson> Second Code No. Mode No. First Code No. Symbol –4°C –3.5°C –3°C –2.5°C –2°C –1.5°C <Ttson> (–7.2°F) (–6.3°F) (–5.4°F) (–4.5°F) (–3.6°F) (–2.7°F) 11 (21) –2°C...
Page 102 Field Setting from Remote Controller SiUS331604E (8) Setting the Rate of Human Detection (For units with the infrared presence sensor only) Set the sensitivity of the infrared presence sensor. • The infrared presence sensor can be disabled by selecting the Second code No. 04. (Note) When the infrared presence sensor is disabled, the remote controller menu does not display some functions such as the automatic draft reduction, energy-saving operation in absence and halt in absence.
Page 103 SiUS331604E Field Setting from Remote Controller (11) Compensating the Floor Temperature (When the unit is equipped with an infrared floor sensor) 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.
Page 104 Field Setting from Remote Controller SiUS331604E (14) Thermostat Differential Changeover Differential value during thermostat ON/OFF control can be changed. Second Code Mode No. First Code No. Contents 1ºC (1.8ºF) 12(22) 0.5ºC (0.9ºF) (15) Airflow Setting when Heating Thermostat is OFF This setting is used to set airflow when heating thermostat is OFF.
Page 105 SiUS331604E Field Setting from Remote Controller (18) Airflow Setting when Cooling Thermostat is OFF This is used to set airflow to LL airflow when cooling thermostat is OFF. Second Code Mode No. First Code No. Contents LL airflow 12 (22) Set fan speed (19) Setting of Normal Airflow Make the following setting according to the ceiling height.
Page 106 Field Setting from Remote Controller SiUS331604E (21) Swing Pattern Settings (In case of an infrared floor sensor is installed) 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 107 SiUS331604E Field Setting from Remote Controller (25) External Static Pressure Settings (for FXMQ model) Second Code Mode No. First 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)
Page 108 Contents Not equipped 15 (25) Equipped (32) Display of Contact Center (For BRC1E73 only) You can turn OFF the display of "DAIKIN Contact Center" as "Contact for Service Display." Second Code Mode No. First Code No. Contents Displayed 1b (2b)
Page 109: Outdoor-Air Processing Unit - Field Setting (Remote Controller)
SiUS331604E Field Setting from Remote Controller (35) Setting "Restricted / Permitted" for Airflow Block (For Sensing flow type only) Due to possibility of dew condensation, the airflow block function cannot be enabled when closure material kit, fresh air intake kit, natural / separately installed evaporation humidifier, or branch air duct is equipped. This setting will prevent the airflow bock is advertently set to ON.
Page 110 Field Setting from Remote Controller SiUS331604E 2.5.1 Contents of Control Modes Twenty modes consisting of combinations of the following five operation modes with temperature and operation mode setting by remote controller can be set and displayed by operation modes 0 through 19. ON/OFF control impossible by remote controller Used when you want to turn ON/OFF by centralized remote controller only.
Page 111 SiUS331604E Field Setting from Remote Controller 2.5.2 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 112: Field Setting From Outdoor Unit
Field Setting from Outdoor Unit SiUS331604E 3. Field Setting from Outdoor Unit Capacity Setting Caution Be sure to carry out capacity setting after changing the main PCB (A1P) to spare PCB. (for RXTQ48/60TAVJU only) Attach the capacity setting adaptor corresponding to capacity class to connector X51A. Capacity setting is not required for RXTQ36TAVJU.
Page 113: Setting Mode And Monitor Mode
SiUS331604E Field Setting from Outdoor Unit 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 (SET)
Page 114: Setting Mode 1
Field Setting from Outdoor Unit SiUS331604E 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. • COOL/HEAT selection (IND)....Used to select COOL or HEAT by individual outdoor unit (factory setting).
Page 115 SiUS331604E Field Setting from Outdoor Unit Procedure for changing COOL/HEAT selection setting Setting mode 1 is the initial status k ON (normal). In case of other status, h OFF press the MODE (BS1) button one l Blink time and return to the setting mode 1. COOL/HEAT select TEST MODE...
Page 116: Setting Mode 2
Field Setting from Outdoor Unit SiUS331604E Setting Mode 2 Setting item Description Press the MODE (BS1) button for 5 Cool / heat unified seconds and enter the setting mode 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 117 SiUS331604E Field Setting 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 ∗ Address k h h h h h k Binary number Cool / heat unified address...
Page 118 Field Setting from Outdoor Unit SiUS331604E 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 Level 1 (outdoor fan with 6 step or lower) k h h h h k h ∗...
Page 119 SiUS331604E Field Setting 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 –17.7°C (0°F) k h h h h h k –15°C (5°F) k h h h h k h –12.2°C (10°F)
Page 120: Monitor Mode
Field Setting from Outdoor Unit SiUS331604E Monitor Mode LED display Press the MODE (BS1) button and Setting item Data display enter the monitor mode. 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 121 SiUS331604E Field Setting from Outdoor Unit Press the BS2 (SET button) and match with the LEDs No. 1 - 15, push the BS3 (RETURN 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 122: Setting Of Low Noise Operation And Demand Operation
Field Setting from Outdoor Unit SiUS331604E 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 123 SiUS331604E Field Setting 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 124 Field Setting from Outdoor Unit SiUS331604E Detailed Setting Procedure of Low Noise Operation and Demand Control 1. Setting mode 1 (H1P off) In setting mode 2, push the BS1 (MODE button) one time. → The system enters setting mode 1 and the H1P goes off.
Page 125: Setting Of Refrigerant Recovery Mode
SiUS331604E Field Setting 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 No.21 (refrigerant recovery / vacuuming mode) to ON.
Page 126: Check Operation
Field Setting from Outdoor Unit SiUS331604E Check Operation To prevent any trouble in the period of installation on site, the system is provided with a test operation mode enabling check for incorrect wiring, stop valve left in closed, coming out (or misplacing with suction pipe thermistor) or discharge pipe thermistor and judgement of piping length, refrigerant overcharging, and learning for the minimum opening degree of electronic expansion valve.
Page 127: Setting Of Auxiliary Heater Control
SiUS331604E Field Setting from Outdoor Unit 3.10 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 ambient temperature is smaller than the auxiliary heater maximum allowable temperature.
Page 128: Setting Of Heat Pump Lockout And Emergency Heat Mode
Field Setting from Outdoor Unit SiUS331604E 3.11 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 129 SiUS331604E Field Setting from Outdoor Unit Heat pump lockout temperature Heat pump would be locked out when the outdoor ambient temperature is smaller than the heat pump lockout temperature. This setting is only effective when heat pump lockout mode has been set. Setting item display Setting condition display C/H selection...
Page 130: Part 6 Service Diagnosis
SiUS331604E Part 6 Service Diagnosis 1. Servicing Items to be Confirmed .............119 1.1 Troubleshooting..................119 1.2 Precautions for Maintenance..............119 1.3 Refrigerant Properties (R-410A)............... 120 2. Symptom-based Troubleshooting ............121 2.1 Indoor Unit Overall ................... 121 2.2 With the Optional Infrared Floor Sensor........... 124 3.
Page 131 SiUS331604E 4.29 Low Pressure Sensor Abnormality ............181 4.30 PCB (for Inverter Compressor) Abnormality..........182 4.31 Radiation Fin Temperature Rise Abnormality .......... 183 4.32 Inverter Compressor Instantaneous Overcurrent ........184 4.33 Inverter Compressor Overcurrent............. 185 4.34 Inverter Compressor Startup Abnormality ..........186 4.35 Transmission Error (Between Microcomputers on the Outdoor Main PCB) ......
Page 132: Servicing Items To Be Confirmed
Servicing Items to be Confirmed SiUS331604E 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 133: Refrigerant Properties (R-410A)
SiUS331604E Servicing Items to be Confirmed (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 button (BS3).
Page 134: Symptom-Based Troubleshooting
Symptom-based Troubleshooting SiUS331604E 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 135 SiUS331604E Symptom-based Troubleshooting 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 136 Symptom-based Troubleshooting SiUS331604E 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 137: With The Optional Infrared Floor Sensor
SiUS331604E Symptom-based Troubleshooting With the Optional Infrared 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 138: Service Check Function
Service Check Function SiUS331604E 3. Service Check Function Wired Remote Controller 3.1.1 BRC1E73 <Main Menu> • Airflow direction • Quick start • Ventilation • Energy saving options • Schedule • Filter auto clean • Maintenance information • Configuration • Current settings Main Menu screen •...
Page 139 SiUS331604E Service Check Function The following message is displayed on the screen when an error (or a warning) occurs during operation. Check the error code and take the corrective action specified for the particular model. Screen Operation lamp (1) Check if it is an error or warning. Operation Status Display The operation lamp (green) starts to...
Page 140: Wireless Remote Controller
Service Check Function SiUS331604E Wireless Remote Controller If unit stops due to an error, the operation indicating LED on the signal receiving part of indoor unit flashes. The error code can be determined by following the procedure described below. (The error code is displayed when an operation error has occurred.
Page 141 SiUS331604E Service Check Function 2. Change the UNIT No. with Normal mode UP or DOWN button. 1. Press INSPECTION/TEST button to enter the inspection mode. If no button is pressed for 1 minute, equipment returns to normal mode. 3. Press MODE button.
Page 142: Error Codes And Descriptions
Service Check Function SiUS331604E 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 (S1L) abnormality Indoor fan motor (M1F) lock, overload Indoor fan motor abnormality Overload/overcurrent/indoor fan motor lock Swing flap motor abnormality...
Page 143 SiUS331604E Service Check Function k: ON h: OFF l: Blink Error code Operation Reference Description lamp Page System Refrigerant shortage Power supply insufficient or instantaneous abnormality Check operation not executed Transmission error between indoor units and outdoor units Transmission error between remote controller and indoor unit Transmission error between main and sub remote controllers Transmission error between indoor and outdoor units in the same system Improper combination of indoor and outdoor units, indoor units and remote...
Page 144: Error Code Indication By Outdoor Unit Pcb
Service Check Function SiUS331604E Error Code Indication by Outdoor Unit PCB Monitor mode To enter the monitor mode, press Contents of Error 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 145 SiUS331604E Service Check Function 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 146 Service Check Function SiUS331604E Monitor mode Contents of Error 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 147 SiUS331604E Service Check Function 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 of contents of Display of contents of...
Page 148: Troubleshooting By Error Code
Troubleshooting by Error Code SiUS331604E 4. 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 149: Indoor Unit Pcb Abnormality
SiUS331604E 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 150: Drain Level Control System (S1L) Abnormality
Troubleshooting by Error Code SiUS331604E Drain Level Control System (S1L) Abnormality Error Code Applicable FXFQ, FXZQ, FXUQ, FXEQ, FXDQ, FXMQ-PB, FXMQ-M (Option), FXAQ (Option) 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 151 SiUS331604E 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 208- Replace the indoor unit main 230 V (within 5 minutes of PCB (A1P).
Page 152: Indoor Fan Motor (M1F) Lock, Overload
Troubleshooting by Error Code SiUS331604E Indoor Fan Motor (M1F) Lock, Overload Error Code Applicable FXFQ, FXUQ, FXEQ, FXMQ07-12PB, FXAQ 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 Broken wires in, short circuit of, or disconnection of connectors from the fan motor harness...
Page 153 SiUS331604E 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 matters Remove the foreign matters.
Page 154 Troubleshooting by Error Code SiUS331604E ∗1: Check the following connectors. Note: Model Connector FXFQ-T X20A, Relay connector FXFQ09-30P X20A, Relay connector FXFQ36/48P X20A FXUQ X20A, Relay connector FXEQ X20A FXMQ07-12PB FXAQ X20A ∗2. Resistance measuring points and judgment criteria. 1 — —...
Page 155: Indoor Fan Motor Abnormality
SiUS331604E Troubleshooting by Error Code Indoor Fan Motor Abnormality 4.5.1 Indoor Fan Motor Abnormality (FXDQ, FXHQ Models) Error Code Applicable FXDQ, FXHQ 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 156 Troubleshooting by Error Code SiUS331604E 4.5.2 Indoor Fan Motor Abnormality (FXMQ15-54PB) Error Code Applicable FXMQ15-54PB Models Method of Error Error from the current flow on the fan PCB Detection Error from the RPM 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 An overcurrent flows.
Page 157 SiUS331604E 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 158 Troubleshooting by Error Code SiUS331604E 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 159: Overload/Overcurrent/Indoor Fan Motor Lock
SiUS331604E Troubleshooting by Error Code Overload/Overcurrent/Indoor Fan Motor Lock Error Code Applicable FXMQ-M Models Method of Error This error is detected by detecting that the individual power supply for the fan turns OFF. Detection Error Decision When it is not detected that the individual power supply for the indoor fan turns ON while in Conditions operation.
Page 160: Swing Flap Motor Abnormality
Troubleshooting by Error Code SiUS331604E Swing Flap Motor Abnormality Error Code Applicable FXFQ, FXZQ, FXUQ, FXEQ, FXHQ, FXAQ 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 161 SiUS331604E 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 162: Power Supply Voltage Abnormality
Troubleshooting by Error Code SiUS331604E Power Supply Voltage Abnormality Error Code Applicable 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 163: Electronic Expansion Valve Coil Abnormality, Dust Clogging
SiUS331604E Troubleshooting by Error Code 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 micro-computer. Detection The electronic expansion valve main body is checked for dust clogging via micro-computer. Error Decision Pin input for electronic expansion valve coil is abnormal when initializing micro-computer.
Page 164 Troubleshooting by Error Code SiUS331604E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Power is supplied. Replace the electronic expansion valve main body. Electronic expansion valve is Shut the power supply OFF after connected to X7A connection and then restart.
Page 165: Drain Level Above Limit
SiUS331604E Troubleshooting by Error Code 4.10 Drain Level Above Limit Error Code Applicable FXFQ, FXZQ, FXDQ, FXMQ Models Method of Error Water leakage is detected based on float switch ON/OFF operation while the compressor is not in Detection operation. Error Decision When the float switch changes from ON to OFF while the compressor is not in operation.
Page 166: Capacity Determination Device Abnormality
Troubleshooting by Error Code SiUS331604E 4.11 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 167: Transmission Abnormality (Between Indoor Unit Pcb And Fan Pcb)
SiUS331604E Troubleshooting by Error Code 4.12 Transmission Abnormality (between Indoor Unit PCB and Fan PCB) Error Code Applicable FXMQ-PB Models Method of Error Transmission conditions between the indoor unit main PCB (A1P) and fan PCB (A2P) are checked via micro-computer. Detection Error Decision When normal transmission is not carried out for a certain duration.
Page 168 Troubleshooting by Error Code SiUS331604E 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 169: Thermistor Abnormality
SiUS331604E Troubleshooting by Error Code 4.13 Thermistor Abnormality C4, C5, C9, CA Error Code Applicable C4, C5, C9: All indoor units CA: FXMQ-PB models only Models 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 170: Combination Abnormality (Between Indoor Unit Pcb And Fan Pcb)
Troubleshooting by Error Code SiUS331604E 4.14 Combination Abnormality (between Indoor Unit PCB and Fan PCB) Error Code Applicable 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 Supposed...
Page 171: Remote Sensor Abnormality
SiUS331604E Troubleshooting by Error Code 4.15 Remote Sensor Abnormality Error Code Applicable FXTQ Models Method of Error The error is detected out by temperature detected by remote sensor. Detection Error Decision When the remote sensor becomes disconnected or shorted while the unit is running. Conditions Supposed Defective indoor unit thermistor (R1T) for air inlet...
Page 172: Humidity Sensor System Abnormality
Troubleshooting by Error Code SiUS331604E 4.16 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 173: Infrared Presence/Floor Sensor Error
SiUS331604E Troubleshooting by Error Code 4.17 Infrared Presence/Floor Sensor Error Error Code Applicable FXFQ-T 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 174 Troubleshooting by Error Code SiUS331604E Troubleshooting Diagnosis procedure 1 Infrared presence sensor error (Error code CE-01) Is the connection of the adaptor Connect the connector correctly. PCB connector X9A normal? (∗) Is the connection of the Connect the connector correctly. sensor connector normal? Check infrared presence sensor output;...
Page 175 SiUS331604E Troubleshooting by Error Code Troubleshooting Diagnosis procedure 2 Infrared floor sensor error (Error code CE-02) Is the connection of the adaptor Connect the connector correctly. PCB connector X9A normal? (∗) Is the connection of the Connect the connector correctly. sensor connector normal? Check infrared floor sensor output;...
Page 176 Troubleshooting by Error Code SiUS331604E Troubleshooting Diagnosis procedure 3 Infrared floor sensor error (Error code CE-03) Is the connection of the adaptor Connect the connector correctly. PCB connector X9A normal? (∗) Is the connection of the Connect the connector correctly. sensor connector normal? Check infrared floor sensor output;...
Page 177 SiUS331604E Troubleshooting by Error Code Troubleshooting Diagnosis procedure 4 Infrared floor sensor error (Error code CE-04) Is the connection of the adaptor Connect the connector correctly. PCB connector X9A normal? (∗) Is the connection of the Connect the connector correctly. sensor connector normal? Check infrared floor sensor output;...
Page 178: Remote Controller Thermistor Abnormality
Troubleshooting by Error Code SiUS331604E 4.18 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. (See Detection note.) Error Decision When the remote controller thermistor becomes disconnected or shorted while the unit is running. ∗...
Page 179: Outdoor Main Pcb Abnormality
SiUS331604E Troubleshooting by Error Code 4.19 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 180: Activation Of High Pressure Switch
Troubleshooting by Error Code SiUS331604E 4.20 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 181 SiUS331604E Troubleshooting by Error Code 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 182: Activation Of Low Pressure Sensor
Troubleshooting by Error Code SiUS331604E 4.21 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 183 SiUS331604E 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 stop Open the stop valve. valve open? Is the indoor unit failing? (Does the remote controller Eliminate the indoor unit error.
Page 184: Inverter Compressor Motor Lock
Troubleshooting by Error Code SiUS331604E 4.22 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 185 SiUS331604E Troubleshooting by Error Code 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 186: Outdoor Fan Motor Abnormality
Troubleshooting by Error Code SiUS331604E 4.23 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 hole 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 187 SiUS331604E 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 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 188: Electronic Expansion Valve Coil Abnormality
Troubleshooting by Error Code SiUS331604E 4.24 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 189 SiUS331604E Troubleshooting by Error Code ∗1: Measure the connector pin-to-pin resistance and make sure that the resistance value is within Note: the range listed in the table below. Determine the type according to the connector wire color and measure the resistance. RXTQ36TAVJU X21A (Y1E) (White) 1...
Page 190: Discharge Pipe Temperature Abnormality
Troubleshooting by Error Code SiUS331604E 4.25 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 191: Refrigerant Overcharged
SiUS331604E Troubleshooting by Error Code 4.26 Refrigerant Overcharged Error Code Applicable All outdoor units Models Method of Error Excessive charging of refrigerant is detected by using the outdoor air temperature, heat exchanger Detection deicer temperature and liquid pipe temperature during a check operation. Error Decision During a check operation, the amount of refrigerant will be calculated based on the outdoor Conditions...
Page 192: Thermistor Abnormality
Troubleshooting by Error Code SiUS331604E 4.27 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 193: High Pressure Sensor Abnormality
SiUS331604E Troubleshooting by Error Code 4.28 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 194: Low Pressure Sensor Abnormality
Troubleshooting by Error Code SiUS331604E 4.29 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 195: Pcb (For Inverter Compressor) Abnormality
SiUS331604E Troubleshooting by Error Code 4.30 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 196: Radiation Fin Temperature Rise Abnormality
Troubleshooting by Error Code SiUS331604E 4.31 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 197: Inverter Compressor Instantaneous Overcurrent
SiUS331604E Troubleshooting by Error Code 4.32 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 198: Inverter Compressor Overcurrent
Troubleshooting by Error Code SiUS331604E 4.33 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 199: Inverter Compressor Startup Abnormality
SiUS331604E Troubleshooting by Error Code 4.34 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 200: Transmission Error (Between Microcomputers On The Outdoor Main Pcb)
Troubleshooting by Error Code SiUS331604E 4.35 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 201: Inverter Circuit Capacitor High Voltage
SiUS331604E Troubleshooting by Error Code 4.36 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 202: Radiation Fin Thermistor Abnormality
Troubleshooting by Error Code SiUS331604E 4.37 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 203: Refrigerant Shortage
SiUS331604E Troubleshooting by Error Code 4.38 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 204 Troubleshooting by Error Code SiUS331604E 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 205: Power Supply Insufficient Or Instantaneous Abnormality
SiUS331604E Troubleshooting by Error Code 4.39 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 invertor has abnormal voltage or the power supply voltage Conditions is abnormal.
Page 206 Troubleshooting by Error Code SiUS331604E 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 207: Check Operation Not Executed
SiUS331604E Troubleshooting by Error Code 4.40 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 is not executed.
Page 208: Transmission Error Between Indoor Units And Outdoor Units
Troubleshooting by Error Code SiUS331604E 4.41 Transmission Error between Indoor Units and Outdoor Units Error Code Applicable All indoor and outdoor units Models Method of Error Micro-computer 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 209 SiUS331604E Troubleshooting by Error Code Troubleshooting Outdoor unit PCB Replace the outdoor main micro-computer 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 button on the outdoor unit more.
Page 210: Transmission Error Between Remote Controller And Indoor Unit
Troubleshooting by Error Code SiUS331604E 4.42 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 controller, check the system using micro-computer is signal Detection transmission between indoor unit and remote controller (main and sub) is normal. Error Decision Normal transmission does not continue for specified period.
Page 211: Transmission Error Between Main And Sub Remote Controllers
SiUS331604E Troubleshooting by Error Code 4.43 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 controller, check the system using micro-computer if signal Detection transmission between indoor unit and remote controller (main and sub) is normal. Error Decision Normal transmission does not continue for specified period.
Page 212: Transmission Error Between Indoor And Outdoor Units In The Same System
Troubleshooting by Error Code SiUS331604E 4.44 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 213: Improper Combination Of Indoor And Outdoor Units, Indoor Units And Remote Controller
SiUS331604E Troubleshooting by Error Code 4.45 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 214 Troubleshooting by Error Code SiUS331604E 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 215: Address Duplication Of Centralized Controller
SiUS331604E Troubleshooting by Error Code 4.46 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 216: Transmission Error Between Centralized Controller And Indoor Unit
Troubleshooting by Error Code SiUS331604E 4.47 Transmission Error between Centralized Controller and Indoor Unit Error Code Applicable All indoor units intelligent Touch Controller Models Centralized controller Method of Error Micro-computer 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 217 SiUS331604E Troubleshooting by Error Code 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 displayed. Is the transmission error ) caused on all indoor units? Is the power supply of...
Page 218 Troubleshooting by Error Code SiUS331604E Troubleshooting Check the transmission wiring between Abnormal centralized controller for Correct the wiring. any broken wire. CHECK 13 Normal Check transmission wiring with the master Abnormal Correct the wiring. centralized controller for any broken wire. CHECK 13 Normal Has the...
Page 219: System Not Set
SiUS331604E Troubleshooting by Error Code 4.48 System not Set Error Code Applicable All indoor 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. Error Decision The error is determined as soon as the abnormality aforementioned is detected through checking Conditions...
Page 220: System Abnormality, Refrigerant System Address Undefined
Troubleshooting by Error Code SiUS331604E 4.49 System Abnormality, Refrigerant System Address Undefined Error Code Applicable All indoor units Models 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 and outdoor-outdoor...
Page 221 SiUS331604E Troubleshooting by Error Code 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 222: Defective Pcb
Troubleshooting by Error Code SiUS331604E 4.50 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 223: Transmission Error (Between Centralized Controllers)
SiUS331604E Troubleshooting by Error Code 4.51 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 224 Troubleshooting by Error Code SiUS331604E 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 225: Poor Centralized Controller Combination
SiUS331604E Troubleshooting by Error Code 4.52 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 226 Troubleshooting by Error Code SiUS331604E 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 227: Address Duplication, Poor Setting
SiUS331604E Troubleshooting by Error Code 4.53 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 are Conditions both set as master centralized controllers or slave centralized controllers.
Page 228 Troubleshooting by Error Code SiUS331604E 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 229: The Operation Lamp Blinks
SiUS331604E Troubleshooting by Error Code 4.54 The Operation Lamp Blinks 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 230 Troubleshooting by Error Code SiUS331604E Troubleshooting Continued from the previous page Does all the indoor the indoor unit on which the error occurred units experiencing Correct the setting of set the group No.? transmission the group No. failure? Replace the centralized controller PCB.
Page 231: Central Control Indicator Lamp Blinks (One Blink)
SiUS331604E Troubleshooting by Error Code 4.55 Central Control Indicator Lamp Blinks (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 232 Troubleshooting by Error Code SiUS331604E 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 233 SiUS331604E Troubleshooting by Error Code Troubleshooting Continued from the previous page Is the ON/OFF Do two or controller control range more ON/OFF controllers Modify the setting of the setting switch set connect? ON/OFF controller control duplicately? range setting switch. Reset the power supply of the ON/OFF controller.
Page 234: Central Control Indicator Lamp Blinks (Two Blinks)
Troubleshooting by Error Code SiUS331604E 4.56 Central Control Indicator Lamp Blinks (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 235: Check
SiUS331604E Troubleshooting by Error Code 4.57 Check CHECK 1 Check for causes of rise in high pressure 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.
Page 236 Troubleshooting by Error Code SiUS331604E CHECK 2 Check for causes of drop in low pressure 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 Defective sensor (∗1.)
Page 237 SiUS331604E Troubleshooting by Error Code CHECK 3 Check the factors of superheat operation 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...
Page 238 Troubleshooting by Error Code SiUS331604E CHECK 4 Power transistor check 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 tester in the analog system is recommended. [Preparation] A tester in the digital system with diode check function will be ·...
Page 239 SiUS331604E Troubleshooting by Error Code CHECK 6 Check for overcharge of refrigerant 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 judgement, refer to the information below.
Page 240 Troubleshooting by Error Code SiUS331604E CHECK 7 Check for shortage of refrigerant 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 judgement, refer to the information below.
Page 241 SiUS331604E Troubleshooting by Error Code CHECK 8 Vacuuming and dehydration procedure 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 242 Troubleshooting by Error Code SiUS331604E CHECK 9 List of inverter-related error codes 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 •...
Page 243 SiUS331604E Troubleshooting by Error Code CHECK 10 Concept of inverter-related error codes 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...
Page 244 Troubleshooting by Error Code SiUS331604E CHECK 11 Thermistor Resistance / Temperature Characteristics Thermistor type of indoor units Model Indoor heat exchanger Indoor heat exchanger Discharge air Suction air thermistor (liquid) thermistor (gas) thermistor thermistor FXFQ-T Type C – FXFQ-P Type D –...
Page 245 SiUS331604E Troubleshooting by Error Code 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 –...
Page 246 Troubleshooting by Error Code SiUS331604E 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...
Page 247 SiUS331604E Troubleshooting by Error Code CHECK 12 Voltage measurement Point High pressure sensor Main PCB (A1P) X17A (black) Black Micro-computer White A/D input Measure DC voltage here. Low pressure sensor Main PCB (A1P) X18A (white) Black White Micro-computer A/D input Measure DC voltage here.
Page 248 Troubleshooting by Error Code SiUS331604E Pressure sensor and voltage characteristics 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 249 SiUS331604E Troubleshooting by Error Code CHECK 13 Broken wire check for the connecting wires 1. Procedure for checking outdoor-outdoor unit transmission wiring for broken wires: On the system shown below, turn OFF the power supply to all equipment, short circuit between the outdoor-outdoor unit terminal F1 and F2 in "Outdoor Unit A"...
Page 250 Troubleshooting by Error Code SiUS331604E CHECK 14 Master unit centralized connector setting table 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 251 SiUS331604E Troubleshooting by Error Code CHECK 15 Master-slave unit setting table 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 252: Part 7 Appendix
SiUS331604E Part 7 Appendix 1. Wiring Diagrams..................240 1.1 Outdoor Unit ..................... 240 1.2 Indoor Unit....................243 1.3 Air Treatment Equipment ................. 255 Appendix...
Page 253: Wiring Diagrams
SiUS331604E Wiring Diagrams 1. Wiring Diagrams Outdoor Unit RXTQ36TAVJU Appendix...
Page 254 Wiring Diagrams SiUS331604E RXTQ48TAVJU Appendix...
Page 255 SiUS331604E Wiring Diagrams RXTQ60TAVJU Appendix...
Page 256: Indoor Unit
Wiring Diagrams SiUS331604E Indoor Unit FXFQ07/09/12/15/18/24/30/36/48TVJU Appendix...
Page 257 SiUS331604E Wiring Diagrams FXFQ09/12/18/24/30/36/48PVJU Appendix...
Page 258 Wiring Diagrams SiUS331604E FXZQ07/09/12/15/18MVJU9 Appendix...
Page 259 SiUS331604E Wiring Diagrams FXUQ18/24/30/36PVJU Appendix...
Page 260 Wiring Diagrams SiUS331604E FXEQ07/09/12/15/18/24PVJU Appendix...
Page 261 SiUS331604E Wiring Diagrams FXDQ07/09/12/18/24MVJU Appendix...
Page 262 Wiring Diagrams SiUS331604E FXMQ07/09/12/15/18/24/30/36/48/54PBVJU Appendix...
Page 263 SiUS331604E Wiring Diagrams FXMQ72/96MVJU Appendix...
Page 264 Wiring Diagrams SiUS331604E FXHQ12/24/36MVJU Appendix...
Page 265 SiUS331604E Wiring Diagrams FXAQ07/09/12/18/24PVJU Appendix...
Page 266 Wiring Diagrams SiUS331604E FXLQ07/09/12/18/24MVJU FXNQ07/09/12/18/24MVJU Appendix...
Page 267 SiUS331604E Wiring Diagrams FXTQ12/18/24/30/36/42/48/54PAVJU Appendix...
Page 268: Air Treatment Equipment
Wiring Diagrams SiUS331604E Air Treatment Equipment 1.3.1 Outdoor Air Processing Unit FXMQ48/72MFVJU Appendix...
Page 269 SiUS331604E Wiring Diagrams 1.3.2 Energy Recovery Ventilator (VAM Series) VAM300/470/600GVJU Appendix...
Page 270 Wiring Diagrams SiUS331604E VAM1200GVJU Appendix...
Page 271 Revision History Month / Year Version Revised contents 06 / 2016 SiUS331604E First edition...
Page 272 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 unauthorised parts and accessories or improper installation of parts and accessories can result in water or refrigerant leakage, electrical shock, fire or explosion.

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Daikin VRV IV-S RXTQ-TAVJU Series Service Manual

Table of Contents

Part 1 General Information

1 Model Names of Indoor/Outdoor Units

2 External Appearance

3 Capacity Range

Refrigerant Circuit Part 2

Part 2 Refrigerant Circuit

1 Refrigerant Circuit

2 Functional Parts Layout

Part 3 Remote Controller

1 Applicable Models

2 Names and Functions

3 MAIN/SUB Setting

4 Centralized Control Group No. Setting

5 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 Setting

1 Test Operation

2 Field Setting from Remote Controller

3 Field Setting from Outdoor Unit

Part 6 Service Diagnosis

1 Servicing Items to be Confirmed

2 Symptom-Based Troubleshooting

3 Service Check Function

4 Troubleshooting by Error Code

Part 7 Appendix

Quick Links

Chapters

Troubleshooting

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Summary of Contents for Daikin VRV IV-S RXTQ-TAVJU Series