Page 1 SiE21-205 Service Manual Split System Air Conditioners Sky Air B-Series R-410A [Applied Models] SkyAir: Heat Pump SkyAir: Cooling Only...
Page 2: Table Of Contents
Si21-205 Split-System Air Conditioners Sky Air B-Series R410A 1. Introduction ................... vii 1.1 Safety Cautions ..................vii Part 1 Model Name and Power Supply .........1 1. Models.....................2 1.1 Model Name and Power Supply .............. 2 1.2 External Appearance ................3 Part 2 Functions ................5 1.
Page 3 Si21-205 1.5 Detailed Explanation of Setting Modes..........60 1.6 Centralized Group No. Setting............... 64 2. Settings Concerning Maintenance ............65 2.1 Indoor Unit PCB..................65 2.2 Outdoor Unit PCB (25/35 class) ............67 2.3 Outdoor Unit PCB (50/60 class) ............69 3.
Page 4 Si21-205 Part 8 Troubleshooting .............117 1. Troubleshooting Based on Equipment Condition........119 1.1 Equipment does not operate............... 120 1.2 Indoor fan operates, but compressor does not........121 1.3 Cooling / Heating operation starts but stops immediately....123 1.4 After shutting down, equipment does not restart for a while....124 1.5 Equipment operates but does not provide cooling.
Page 5 Si21-205 6.11 Output Over Current Detection............179 6.12 Insufficient Gas..................181 6.13 Over-voltage Detection................ 183 6.14 High Pressure Control in Cooling ............184 6.15 Checks for Outdoor Unit (25/35 class) ..........186 7. Troubleshooting for Outdoor Unit (50/60 class) ........195 7.1 OL Activation (Compressor Overload)..........
Page 6 Si21-205 3.4 Removal of Propeller Fan and Fan Motor ........... 273 3.5 Removal of Compressor Noise Absorption Pad ........275 3.6 Removal of Partition Plate and Reactor ..........277 3.7 Removal of Four Way Valve and Motor Valve........280 3.8 Removal of Compressor..............283 4.
Page 7 Si21-205 Table of Contents...
Page 8: Introduction
Si21-205 Introduction 1. Introduction Safety Cautions Cautions and Be sure to read the following safety cautions before conducting repair work. Warnings The caution items are classified into “ Warning” and “ Caution”. The “ Warning” items are especially important since they can lead to death or serious injury if they are not followed closely.
Page 9: Cautions Regarding Products After Repair
Introduction Si21-205 Caution Do not repair the electrical components with wet hands. Working on the equipment with wet hands can cause an electrical shock. Do not clean the air conditioner by splashing water. Washing the unit with water can cause an electrical shock. Be sure to provide the grounding when repairing the equipment in a humid or wet place, to avoid electrical shocks.
Page 10: Inspection After Repair
Si21-205 Introduction Warning Be sure to use the specified cable to connect between the indoor and outdoor units. Make the connections securely and route the cable properly so that there is no force pulling the cable at the connection terminals. Improper connections can cause excessive heat generation or fire.
Page 11: Using Icons
Introduction Si21-205 Caution Check to see if the parts and wires are mounted and connected properly, and if the connections at the soldered or crimped terminals are secure. Improper installation and connections can cause excessive heat generation, fire or an electrical shock. If the installation platform or frame has corroded, replace it.
Page 12: Part 1 Model Name And Power Supply
Si21-205 Part 1 Model Name and Power Supply 1. Models.....................2 1.1 Model Name and Power Supply .............. 2 1.2 External Appearance ................3 Model Name and Power Supply...
Page 13: Models
Models Si21-205 1. Models Model Name and Power Supply Indoor Units Outdoor Units Power Supply FFQ25BV1B RXS25BVMB FFQ25BV1B RKS25BVMB FFQ35BV1B RXS35BVMB FFQ35BV1B RKS35BVMB 1φ, 230V, 50Hz FFQ50BV1B RXS50BVMB FFQ50BV1B RKS50BVMB FFQ50BV1B RS50BVMB Ceiling Mounted Multi-flow Cassette Type FFQ50BV1B RXS50BVMA 1φ, 240V, 50Hz FFQ50BV1B RKS50BVMA FFQ60BV1B...
Page 14: External Appearance
Si21-205 Models External Appearance Indoor Units FHQ-BU FFQ-B Remote Controller Wired Type Wireless Type Outdoor Units 25/35 Class 50/60 Class Model Name and Power Supply...
Page 15 Models Si21-205 Model Name and Power Supply...
Page 16: Part 2 Functions
Si21-205 Part 2 Functions 1. List of Functions ..................6 Functions...
Page 17: List Of Functions
List of Functions Si21-205 1. List of Functions FFQ / FHQ Ceiling Mounted Ceiling Suspended Multi-flow Cassette Type (FHQ) Items Improved Points and Functions Type (FFQ) 25~60BV1B 35~60BUV1B Indoor Units Model Type Outdoor Units Appearance Improved Main Reduction of Dimensions or Improvement Weight Reduction of Operation Sound...
Page 18: Part 3 Specifications
Si21-205 Part 3 Specifications 1. Specifications ..................8 1.1 Ceiling Mounted Cassette Type .............. 8 1.2 Ceiling Suspended Type ............... 14 Specifications...
Page 19: Specifications
Specifications Si21-205 1. Specifications Ceiling Mounted Cassette Type 1.1.1 25 class 230V, 50Hz Indoor Units FFQ25BV1B FFQ25BV1B Model Outdoor Units RXS25BVMB RKS25BVMB 2.5 (1.0~3.0) 2.5 (1.0~3.0) 1 Cooling Capacity (Min~Max) Btu/h 8,550 (3,400~10,250) 8,550 (3,400~10,250) kcal/h 2,150 (860~2,580) 2,150 (860~2,580) 3.2 (1.0~4.5) —...
Page 20 Si21-205 Specifications 1.1.2 35 class 230V, 50Hz Indoor Units FFQ35BV1B FFQ35BV1B Model Outdoor Units RXS35BVMB RKS35BVMB 3.4 (1.0~3.7) 3.4 (1.0~3.7) 1 Cooling Capacity (Min.~Max.) Btu/h 11,600 (3,400~12,600) 11,600 (3,400~12,600) kcal/h 2,920 (860~3,180) 2,920 (860~3,180) 4.5 (1.0~5.0) — 1 Heating capacity (Min.~Max.) Btu/h 15,350 (3,400~17,050) —...
Page 21 Specifications Si21-205 1.1.3 50 class 230V, 50Hz Indoor Units FFQ50BV1B FFQ50BV1B FFQ50BV1B Model Outdoor Units RXS50BVMB RKS50BVMB RS50BVMB 4.7 (0.9~5.6) 4.7 (0.9~5.6) 1 Cooling Capacity (Min~Max) Btu/h 16,050 (3,050~19,100) 16,050 (3,050~19,100) 16,050 kcal/h 4,040 (770~4,820) 4,040 (770~4,820) 4,040 5.5 (0.9~7.0) —...
Page 22 Si21-205 Specifications 240V, 50Hz Indoor Units FFQ50BV1B FFQ50BV1B Model Outdoor Units RXS50BVMA RKS50BVMA 4.7 (0.9~5.6) 4.7 (0.9~5.6) 1 Cooling Capacity (Min.~Max.) Btu/h 16,050 (3,050~19,100) 16,050 (3,050~19,100) kcal/h 4,040 (770~4,820) 4,040 (770~4,820) 5.5 (0.9~7.0) — 1 Heating capacity (Min.~Max.) Btu/h 18,750 (3,050~23,900) —...
Page 23 Specifications Si21-205 1.1.4 60 class 230V, 50Hz Indoor Units FFQ60BV1B FFQ60BV1B FFQ60BV1B Model Outdoor Units RXS60BVMB RKS60BVMB RS60BVMB 5.8 (0.9~6.0) 5.8 (0.9~6.0) 1 Cooling Capacity (Min~Max) Btu/h 19,800 (3,050~20,450) 19,800 (3,050~20,450) 19,800 kcal/h 5,000 (770~5,160) 5,000 (770~5,160) 5,000 7.0 (0.9~8.0) —...
Page 24 Si21-205 Specifications 240V, 50Hz Indoor Units FFQ60BV1B FFQ60BV1B Model Outdoor Units RXS60BVMA RKS60BVMA 5.8 (0.9~6.0) 5.8 (0.9~6.0) 1 Cooling Capacity (Min.~Max.) Btu/h 19,800 (3,050~20,450) 19,800 (3,050~20,450) kcal/h 5,000 (770~5,160) 5,000 (770~5,160) 7.0 (0.9~8.0) — 1 Heating capacity (Min.~Max.) Btu/h 23,900 (3,050~27,300) —...
Page 25: Ceiling Suspended Type
Specifications Si21-205 Ceiling Suspended Type 1.2.1 35 class 230V, 50Hz Indoor Units FHQ35BUV1B FHQ35BUV1B Model Outdoor Units RXS35BVMB RKS35BVMB 3.4 (1.0~3.7) 3.4 (1.0~3.7) 1 Cooling Capacity (Min.~Max.) Btu/h 11,600 (3,400~12,600) 11,600 (3,400~12,600) kcal/h 2,920 (860~3,180) 2,920 (860~3,180) 4.1 (1.0~5.0) — 1 Heating Capacity (Min.~Max.) Btu/h 14,000 (3,400~17,050)
Page 26 Si21-205 Specifications 1.2.2 50 class 230V, 50Hz Indoor Units FHQ50BUV1B FHQ50BUV1B FHQ50BUV1B Model Outdoor Units RXS50BVMB RKS50BVMB RS50BVMB 5.0 (0.9~5.6) 5.0 (0.9~5.6) 1 Cooling Capacity (Min.~Max.) Btu/h 17,050 (3,050~19,100) 17,050 (3,050~19,100) 17,050 kcal/h 4,300 (770~4,820) 4,300 (770~4,820) 4,300 6.0 (0.9~7.0) —...
Page 27 Specifications Si21-205 1.2.3 60 class 230V, 50Hz Indoor Units FHQ60BUV1B FHQ60BUV1B FHQ60BUV1B Model Outdoor Units RXS60BVMB RKS60BVMB RS60BVMB 5.7 (0.9~6.0) 5.7 (0.9~6.0) 1 Cooling Capacity (Min.~Max.) Btu/h 19,450 (3,050~20,450) 19,450 (3,050~20,450) 19,450 kcal/h 4,900 (770~5,160) 4,900 (770~5,160) 4,900 7.2 (0.9~8.0) —...
Page 28: Part 4 Remote Controller
Si21-205 Part 4 Remote Controller 1. Wired Remote Controller...............18 1.1 Features ....................18 1.2 Installation ..................... 20 2. Wireless Remote Controller ..............22 2.1 Features ....................22 Remote Controller...
Page 29: Wired Remote Controller
Wired Remote Controller Si21-205 1. Wired Remote Controller Features BRC1C61, BRC1C517 FFQ-B, FHQ-BU BRC1C61, BRC1C517 TEST AVAILABLE TEST 3PA59583-16Z-1 Remote Controller...
Page 30 Si21-205 Wired Remote Controller TIMER MODE START/STOP BUTTON ON/OFF BUTTON Press the button and the system will start. Press the button again and the system will TIMER ON/OFF BUTTON stop. OPERATION LAMP (RED) INSPECTION/TEST OPERATION BUTTON The lamp lights up during operation. This button is used only by qualified service DISPLAY “...
Page 31: Installation
Wired Remote Controller Si21-205 Installation 1. Remove the upper part of remote controller. Insert minus screwdriver into the Upper Part of Remote slots in the lower part of remote Controller controller (2 places), and remove the upper part of remote controller. The PC board is mounted in the upper part of remote controller.
Page 32 Si21-205 Wired Remote Controller 3. Wire the indoor unit NOTE When wiring, run the wiring away the Connect the terminals on top of the upper part of remote power supply wiring in order to avoid controller (P1, P2), and the terminals of the indoor unit (P1, receiving electric noise (external noise).
Page 33: Wireless Remote Controller
Wireless Remote Controller Si21-205 2. Wireless Remote Controller Features Names and Function Model Series Name of Option FFQ-B FHQ-BU H / P BRC7E530W BRC7E63W Remote Controller C / O BRC7E531W BRC7E66 ON OFF DOWN ON OFF TEMP TIME DOWN RESERVE CANCEL TIMER TEST MODE...
Page 34 Si21-205 Wireless Remote Controller TIMER RESERVE/CANCEL BUTTON DISPLAY “ ” (SIGNAL TRANSMISSION) This lights up when a signal is being AIR FLOW DIRECTION ADJUST transmitted. BUTTON DISPLAY “ ” “ ” “ ” “ ” OPERATION MODE SELECTOR “ ” (OPERATION MODE) BUTTON This display shows the current OPER- Press this button to select OPERATION...
Page 35 Wireless Remote Controller Si21-205 Remote Controller...
Page 36: Part 5 Field Piping And Wiring
Si21-205 Part 5 Field Piping and Wiring 1. Field Piping and Wiring .................26 1.1 Precautions for New Refrigerant (R410A) ..........26 1.2 Refrigerant Piping, Drain Piping, and Wiring for FFQ Model ....35 1.3 Refrigerant Piping, Drain Piping, and Wiring for FHQ Model ....44 Field Piping and Wiring...
Page 37: Field Piping And Wiring
Field Piping and Wiring Si21-205 1. Field Piping and Wiring Precautions for New Refrigerant (R410A) 1.1.1 Outline About Refrigerant R410A Characteristics of new refrigerant, R410A 1. Performance Almost the same performance as R22 and R407C 2. Pressure Working pressure is approx. 1.4 times more than R22 and R407C. 3.
Page 38 Si21-205 Field Piping and Wiring Thermodynamic characteristic of R410A Temperature Steam pressure Density Specific heat at constant Specific enthalpy Specific entropy (˚C) (kPa) (kg/m pressure (kJ/kgK) (kJ/kg) (kJ/KgK) Liquid Vapor Liquid Vapor Liquid Vapor Liquid Vapor Liquid Vapor Field Piping and Wiring...
Page 39: Refrigerant Cylinders
Field Piping and Wiring Si21-205 1.1.2 Refrigerant Cylinders Cylinder specifications 2 The cylinder is painted refrigerant color (pink). 2 The cylinder valve is equipped with a siphon tube. Cylinder Refrigerant can be charged in liquid state with cylinder in upright position. Caution: Do not lay cylinder on its side during charging, since it cause refrigerant in gas state to enter the system.
Page 40: Service Tools
Si21-205 Field Piping and Wiring 1.1.3 Service Tools R410A is used under higher working pressure, compared to previous refrigerants (R22,R407C). Furthermore, the refrigerating machine oil has been changed from Suniso oil to Ether oil, and if oil mixing is occurred, sludge results in the refrigerants and causes other problems. Therefore, gauge manifolds and charge hoses that are used with a previous refrigerant (R22,R407C) can not be used for products that use new refrigerants.
Page 41 Field Piping and Wiring Si21-205 1. Flaring tool Flare gauge Specifications 2 Dimension A Unit:mm Tube O.D. -0.4 Nominal size Class-2 (R410A) Class-1 (Conventional) 6.35 9.52 13.2 13.0 12.70 16.6 16.2 15.88 19.7 19.4 19.05 24.0 23.3 Differences 2 Change of dimension A Dimension A For class-1: R407C For class-2: R410A...
Page 42 Si21-205 Field Piping and Wiring 2. Torque wrench Specifications 2 Dimension B Unit:mm Nominal size Class-1 Class-2 Previous No change in tightening torque No change in pipes of other sizes Differences 2 Change of dimension B Only 1/2", 5/8" are extended For class-1: R407C For class-2: R410A Dimension B...
Page 43 Field Piping and Wiring Si21-205 4. Leak tester Specifications 2 Hydrogen detecting type, etc. 2 Applicable refrigerants R410A, R407C, R404A, R507A, R134a, etc. Differences 2 Previous testers detected chlorine. Since HFCs do not contain chlorine, new tester detects hydrogen. 5. Refrigerant oil (Air compal) Specifications 2 Contains synthetic oil, therefore it can be used for piping work of every refrigerant cycle.
Page 44 Si21-205 Field Piping and Wiring 2 Temperature scale indicates the relationship between pressure and temperature in gas saturated state. Differences 2 Change in pressure 2 Change in service port diameter 7. Charge hose for R410A (Hose with ball valve) Specifications 2 Working pressure 5.08 MPa (51.8 kg/cm 2 Rupture pressure 25.4 MPa (259 kg/cm 2 Available with and without hand-operate valve that prevents refrigerant from outflow.
Page 45 Field Piping and Wiring Si21-205 9. Weigher for refrigerant charge Specifications 2 High accuracy TA101A (for 10-kg cylinder) = ± 2g TA101B (for 20-kg cylinder) = ± 5g 2 Equipped with pressure-resistant sight glass to check liquid refrigerant charging. 2 A manifold with separate ports for HFCs and previous refrigerants is equipped as standard accessories.
Page 46: Refrigerant Piping, Drain Piping, And Wiring For Ffq Model
Si21-205 Field Piping and Wiring Refrigerant Piping, Drain Piping, and Wiring for FFQ Model 1.2.1 Refrigerant Piping Work For FFQ Model <For refrigerant piping of outdoor units, see the installation manual attached to the outdoor unit.> <Execute heat insulation work completely on both sides of the gas piping and the liquid piping.
Page 47 Field Piping and Wiring Si21-205 Not recommendable but in case of emergency You must use a torque wrench but if you are obliged to install the unit without a torque wrench, you may follow the installation method mentioned below. After the work is finished, make sure to check that there is no gas leak. When you keep on tightening the flare nut with a spanner, there is a point where the tightening torque suddenly increases.
Page 48 Si21-205 Field Piping and Wiring • Make absolutely sure to execute heat insulation works on the pipe-connecting section after checking gas leakage by thoroughly studying the following figure and using the attached heat insulating materials for fitting (8) and (9). (Fasten both ends with the clamps (4).) (Refer to Fig.
Page 49 Field Piping and Wiring Si21-205 • Drain socket • Wrap the attached sealing pad (10) over the clamp and drain hose to insulate. Clamp (2) Clamp (2) (attached) Large sealing pad (10) (attached) (attached) Drain hose (1) Tape (Gray) (attached) Fig.
Page 50 Si21-205 Field Piping and Wiring Drain pipe Fig. 23 (mm) Service drain outlet (with rubber plug) (Use this outlet to drain water from Plastic container the drain pan) for pouring <Adding water through air outlet> (Tube should be about 100 mm long.) [Method of adding water] Control box lid...
Page 51 Field Piping and Wiring Si21-205 1.2.3 Wiring Example For FFQ Model For the wiring of outdoor units, refer to the installation manual attached to the outdoor units. Confirm the system type. • Pair type (Refer to Fig. 25) 1 remote controller controls 1 indoor unit. (standard system) •...
Page 52 Si21-205 Field Piping and Wiring 1.2.4 Electric Wiring Work For FFQ Model • All field supplied parts and materials and electric works must conform to local codes. • Use copper wire only. • For electric wiring work, refer to also “...
Page 53 Field Piping and Wiring Si21-205 Connection of wiring between units, ground wire and for the remote control cord (Refer to Fig. 29) • Wiring between units and ground wire Remove the control box lid and connect wires of matching number to the power supply terminal block (4P)inside.
Page 54 Si21-205 Field Piping and Wiring Observe the notes mentioned below when wiring to the power supply terminal block. Tightening torque for the terminal blocks. • Use the correct screwdriver for tightening the terminal screws. If the blade of screwdriver is too small, the head of the screw might be damaged, and the screw will not be properly tightened.
Page 55: Refrigerant Piping, Drain Piping, And Wiring For Fhq Model
Field Piping and Wiring Si21-205 Refrigerant Piping, Drain Piping, and Wiring for FHQ Model 1.3.1 Refrigerant Piping Work 〈For refrigerant piping of outdoor units, see the installation manual attached to the outdoor unit.〉 〈Execute heat insulation work completely on both sides of the gas piping and the liquid piping.
Page 56 Si21-205 Field Piping and Wiring Not recommendable but in case of emergency You must use a torque wrench but if you are obliged to install the unit without a torque wrench, you may follow the installation method mentioned below. After the work is finished, make sure to check that there is no gas leak. When you keep on tightening the flare nut with a spanner, there is a point where the tightening torque suddenly increases.
Page 57 Field Piping and Wiring Si21-205 Small sealing pad (9) (attached) Fig. 13 Wrap from the bottom up Insulation for gas pipe (6) (attached) Gas piping Liquid piping Insulation for liquid pipe (7) (attached) Clamp (4) (attached) (× 4) Attach to the bottom (For both gas piping and liquid piping) (1) For piping facing back.
Page 58: Drain Piping Work
Si21-205 Field Piping and Wiring 1.3.2 Drain Piping Work (1) Carry out the drain piping. • Make sure piping provides proper drainage. • You can select whether to bring the drain piping our from the rear right, right, rear left, or left. For rear right-facing and right-facing situations, refer to “1.3.1.
Page 59 Field Piping and Wiring Si21-205 • Insulate the clamp bracket and drain hose from the bottom using the included sealing pad (8). (Refer to Fig. 21) • Be sure to insulate all drain piping running indoors. • Do not allow any slack to gather in the drain hose inside the indoor unit. (Refer to Fig. 22) (Slack in the drain hose can cause the suction grille to break.) (2) Check to make sure the drain flows smoothly after piping is complete.
Page 60: Wiring Example
Si21-205 Field Piping and Wiring 1.3.3 Wiring Example For the wiring of outdoor units, refer to the installation manual attached to the outdoor units. Confirm the system type. • Pair or Multi system : 1 remote controller controls 1 indoor unit. (standard system) (Refer to Fig.
Page 61: Electric Wiring Work
Field Piping and Wiring Si21-205 Note: 1. All transmission wiring except for the remote controller wires is polarized and must match the terminal symbol. 2. In case of group control, perform the remote controller wiring to the master unit when connecting to the simultaneous operation system.
Page 62 Si21-205 Field Piping and Wiring Connection of wiring between units and for the remote control cord (Refer to Fig. 27) • Wiring between units Holding the control box lid, loosen the two securing screws, remove the control box lid, match up the phases on the power source terminal block inside (3P), and make the connections.
Page 63 Field Piping and Wiring Si21-205 Observe the notes mentioned below when wiring to the terminals. Tightening torque for the terminal screws. • Use the correct screwdriver for tightening the terminal screws. If the blade of screwdriver is too small, the head of the screw might be damaged, and the screw will not be properly tightened.
Page 64: Part 6 Field Setting
Si21-205 Part 6 Field Setting 1. Method of Field Set (Reset after Maintenance Inspection/Repair)........54 1.1 Explanation.................... 54 1.2 Field Setting................... 55 1.3 Initial Setting Contents................57 1.4 Local Setting Mode No................58 1.5 Detailed Explanation of Setting Modes..........60 1.6 Centralized Group No.
Page 65: Method Of Field Set (Reset After Maintenance Inspection/Repair)
Method of Field Set (Reset after Maintenance Inspection/Repair) Si21-205 1. Method of Field Set (Reset after Maintenance Inspection/Repair) Explanation Field set is carried out from the remote controller. At time of installation, or after maintenance inspection/repair, carry out field set according to the explanation below. Incorrect settings will cause a malfunction to occur.
Page 66: Field Setting
Si21-205 Method of Field Set (Reset after Maintenance Inspection/Repair) Field Setting 1.2.1 Wired Remote Controller Notes: (Field setting must be made from the remote controller in accordance with the installation conditions.) Setting can be made by changing the “Mode number”, “FIRST CODE NO.”, and “SECOND CODE NO.”.
Page 67 Method of Field Set (Reset after Maintenance Inspection/Repair) Si21-205 1.2.2 Wireless Remote Controller Note: If optional accessories are mounted on the indoor unit, the indoor unit setting may have to be changed. Refer to the instruction manual (optional hand book) for each optional accessory. Procedure 1.
Page 68: Initial Setting Contents
Si21-205 Method of Field Set (Reset after Maintenance Inspection/Repair) Initial Setting Contents Setting Contents Filter Filter Sign High Air Selection Air Flow Air Flow External Long Simul- Sign Estimation of Outlet of Air Direction Direction Static Life Speed taneous Accumulated Velocity Flow Adjust...
Page 69: Local Setting Mode No
Method of Field Set (Reset after Maintenance Inspection/Repair) Si21-205 Local Setting Mode No. Example To set the filter sign time to “filter contamination - heavy” for all units in a group: Set mode No. to “10,” setting switch No. to “0,” and setting position No. to “02.” Table (FHQ &...
Page 70 Si21-205 Method of Field Set (Reset after Maintenance Inspection/Repair) Notes: 1. Setting is made in all units in a group. To set for individual indoor units or to check the setting, use the mode Nos. (with “2” in upper digit) in parentheses ( ). 2.
Page 71: Detailed Explanation Of Setting Modes
Method of Field Set (Reset after Maintenance Inspection/Repair) Si21-205 Detailed Explanation of Setting Modes 1.5.1 Air Flow Direction Setting (FFQ) Set the air flow direction of indoor units as given in the table below. (Set when optional air outlet blocking pad has been installed.) The second code No. is factory set to “01.” Setting Table Mode No.
Page 72 Si21-205 Method of Field Set (Reset after Maintenance Inspection/Repair) 1.5.5 Fan Speed Changeover When Thermostat is OFF (FFQ & FHQ) By setting to “Set Fan Speed,” you can switch the fan speed to the set fan speed when the heating thermostat is OFF. ∗...
Page 73 Method of Field Set (Reset after Maintenance Inspection/Repair) Si21-205 Address Setting <Setting from the remote controller> (It is Factory Set 1. Hold down the “ ” button and the “ ” button for at least 4 seconds, to get the FIELD SET MODE. (Indicated in the display area in the figure at below). to “1”) 2.
Page 74 Si21-205 Method of Field Set (Reset after Maintenance Inspection/Repair) After Setting Stick the Unit No. label at decoration panel air discharge outlet as well as on the back of the wireless remote controller. Wireless remote controller Unit No. label Decoration panel PRECAUTIONS Set the Unit No.
Page 75: Centralized Group No. Setting
Method of Field Set (Reset after Maintenance Inspection/Repair) Si21-205 Centralized Group No. Setting If carrying out centralized control with a central remote controller and unified ON/OFF controller, you have to set the group No. for each group by remote controller. To set the group No., first turn on the power supply of the central remote controller, unified ON/OFF controller and indoor unit.
Page 76: Settings Concerning Maintenance
Si21-205 Settings Concerning Maintenance 2. Settings Concerning Maintenance Indoor Unit PCB FFQ-B Capacity setting adaptor Service monitor LED Field Setting...
Page 77 Settings Concerning Maintenance Si21-205 FHQ-B Capacity setting adaptor Service monitor Field Setting...
Page 78: Outdoor Unit Pcb (25/35 Class)
Si21-205 Settings Concerning Maintenance Outdoor Unit PCB (25/35 class) Outline of PCB PCB(1) PCB(2) 1P101935-1K Detail of PCB (1) Connect to S11 on PCB (2) 3P100242-1B Field Setting...
Page 79 Settings Concerning Maintenance Si21-205 Detail of PCB (2) Field Setting...
Page 80: Outdoor Unit Pcb (50/60 Class)
Si21-205 Settings Concerning Maintenance Outdoor Unit PCB (50/60 class) PCB(1): Control PCB (outdoor unit) FU2(3.15A) S101 (R2865) PCB(2): Power Supply PCB Service Monitor PCB FU1(30A) HAC1 LED-A S102 (R2867) (R2866) Field Setting...
Page 81 Settings Concerning Maintenance Si21-205 FU201 (3.15A) (R2868) CN11 CN14 (R2869) Field Setting...
Page 82: Maintenance Mode Setting
Si21-205 Maintenance Mode Setting 3. Maintenance Mode Setting Procedure 1. Enter the field set mode. Continue to push the inspection / test operation button for a minimum of 4 seconds. 2. Enter the maintenance mode. After having entered the field set mode, continue to push the inspection / test operation button for a minimum of 4 seconds.
Page 83 Maintenance Mode Setting Si21-205 Field Setting...
Page 84: Part 7 Function And Control
Si21-205 Part 7 Function and Control 1. Indoor Unit.....................74 1.1 Function Outline ..................74 1.2 Electric Function Parts................75 1.3 Function Details..................76 2. Outdoor Unit (25/35 class) ..............86 2.1 Function of Thermistor................86 2.2 Mode Hierarchy ..................88 2.3 Frequency Control ................. 89 2.4 Controls at Mode Changing / Start-up ...........
Page 85: Indoor Unit
Indoor Unit Si21-205 1. Indoor Unit Function Outline FFQ-B, FHQ-B (Input) (Output) Indoor Unit Thermostat Control Two thermostats used, suction Suction Sensor(R1T) and remote controller. Fan Motor Monitoring Function Drain Pump Heat Exchanger Sensor Cool/Heat Automatic Optional for FHQ (R2T) Function Heat Exchanger Sensor Program Dry...
Page 86: Electric Function Parts
Si21-205 Indoor Unit Electric Function Parts FFQ – BV1B Capacity Remarks Wired remote controller BRC1C517 Optional (BRC1C61 for Australia) Accessory Wireless remote Heat pump BRC7E530W Optional controller Accessory Cooling only BRC7E531W Electronic control unit [2P095006-2] EC0280 Fan motor [3P104408-1] 4P 55W Fan motor capacitor 4.0MF 440VAC Swing flap motor...
Page 87: Function Details
Indoor Unit Si21-205 Function Details Thermostat Control Initial setting Set temperature Cooling thermostat ON Cooling thermostat OFF Heating thermostat OFF Heating thermostat ON Freeze-up The thermostat turns OFF under the following temperature conditions to prevent freezing of the Protection indoor unit heat exchanger. The motorized valve is controlled to maintain the indoor unit heat exchanger temperature Control (Te) above 0˚C.
Page 88 Si21-205 Indoor Unit Condensation Avoidance Continuous 30 minutes operation of cooling One hour drying Control (FHQ Only) After continuous 30 minutes of operation with downward The unit operation can be reset with changing operation horizontal blade position, change the blade position to mode into "heating"...
Page 89 Indoor Unit Si21-205 -2 Operations when an occurrence of water level abnormality -2-a) Behavior between occurrence and recovery of water level abnormality After compressor stops due to water level abnormality, drain pump is operated intermittently, i.e. min ON, sec OFF and min ON. (*1) The intermittent operation is executed regardless of recovery of water level abnormality during the intermittent operation.
Page 90 Si21-205 Indoor Unit . Heating -1 Basic operation In heating operation of the unit equipped with a humidifier, when "Interlocking of drain pump / humidifier" (15(25)- ) is set to "yes" (02), the drain pump operates 20-min OFF and -min ON repeatedly during compressor is in operation.
Page 91 Indoor Unit Si21-205 - -a)- When a water level abnormality occurs during drain pump OFF The abnormality is determined when 80 seconds elapse from compressor stop. Other than above, behavior is same as 2-2-a). Occurrence of drain water level abnormality Intermittent operation (*1) sec 80 sec Water level abnormality...
Page 92 Si21-205 Indoor Unit Using Conditions (Applicable models: FHQ & FFQ only) for Remote Remote controller thermostat is equipped only in wired remote controller. Even when “ use remote controller thermostat ” is selected in service mode, the remote Controller controller thermostat may not be used. Thermostat <...
Page 93 Indoor Unit Si21-205 Program Dry The points of thermostat ON or OFF are determined according to the suction air temperature at Operation the startup of unit operation. The set temperature and flow rate are not displayed on remote controller. Function Operation startup Thermostat (Differential)
Page 94 Si21-205 Indoor Unit Fan and flap operations Flap Remote Controller FHQ & FFQ Indication Heating Hot Start from Defrost In Swing Horizontal Swing Operation Operation In Airflow Horizontal Set Position Direction Setting Defrost In Swing Horizontal Swing Operation In Airflow Horizontal Set Position Direction Setting...
Page 95 Indoor Unit Si21-205 Mode Conflict [Overview] While the indoor unit for another room and the outdoor unit are operating, when the indoor unit for the own room is activated, the operation mode which can be selected in the own room has some restrictions as mentioned below.
Page 96 Si21-205 Indoor Unit Non-operating [Overview] Room Dew After operating an indoor unit for the own room in the cooling mode or dry mode, stop the unit using the remote controller. Under the condition, when an unit for another room is started Prevention Fan operation in the heating mode, the fan in the own room may rotate in the LL mode even though Control...
Page 97: Outdoor Unit (25/35 Class)
Outdoor Unit (25/35 class) Si21-205 2. Outdoor Unit (25/35 class) Function of Thermistor 2.1.1 Heat Pump Model Electrontic expansion valve Four way valve Compressor (R3077) A Outdoor Heat 1. The outdoor heat exchanger thermistor is used for controlling target discharge temperature. Exchanger Set a target discharge temperature depending on the outdoor and indoor heat exchanger temperature.
Page 98 Si21-205 Outdoor Unit (25/35 class) 2.1.2 Cooling Only Model Electrontic expansion valve Compressor (R3078) A Outdoor Heat 1. The outdoor heat exchanger thermistor is used for controlling target discharge temperature. Exchanger Set a target discharge temperature depending on the outdoor and indoor heat exchanger temperature.
Page 99: Mode Hierarchy
Outdoor Unit (25/35 class) Si21-205 Mode Hierarchy Outline There are two modes; the mode selected in user’s place (normal air conditioning mode) and forced operation mode for installation and providing service. Detail 1. For heat pump model There are following modes; stop, cooling (includes drying), heating (include defrosting) Air conditioner control mode Forced operating mode Forced cooling (for Pump Down Operation)
Page 100: Frequency Control
Si21-205 Outdoor Unit (25/35 class) Frequency Control Outline Frequency will be determined according to the difference between room and set temperature. The function is explained as follows. 1. How to determine frequency. 2. Frequency command from an indoor unit. (The difference between a room temperature and the temperature set by the remote controller.) 3.
Page 101 Outdoor Unit (25/35 class) Si21-205 3. Determine lower limit frequency Set a maximum value as an lower limit frequency among the frequency lower limits of the following functions: Pressure difference upkeep. 4. Determine prohibited frequency There is a certain prohibited frequency such as a power supply frequency. Indoor Frequency Command (∆D signal) The difference between a room temperature and the temperature set by the remote controller will be taken as the “∆D signal”...
Page 102: Controls At Mode Changing / Start-Up
Si21-205 Outdoor Unit (25/35 class) Controls at Mode Changing / Start-up 2.4.1 Preheating Operation Outline Operate the inverter in the open phase operation with the conditions including the preheating command (only for heat pump model) from the indoor, the outdoor air temperature and discharge pipe temperature.
Page 103: Discharge Pipe Temperature Control
Outdoor Unit (25/35 class) Si21-205 Discharge Pipe Temperature Control Outline The discharge pipe temperature is used as the compressor's internal temperature. If the discharge pipe temperature rises above a certain level, the operating frequency upper limit is set to keep this temperature from going up further. Detail Divide the Zone (R2836)
Page 104: Freeze-Up Protection Control
Si21-205 Outdoor Unit (25/35 class) Freeze-up Protection Control Outline During cooling operation, the signals being sent from the indoor unit allow the operating frequency limitation and then prevent freezing of the indoor heat exchanger. (The signal from the indoor unit must be divided into the zones as the followings. Detail Conditions for Start Controlling Judge the controlling start with the indoor heat exchanger temperature after 2 sec from...
Page 105: Fan Control
Outdoor Unit (25/35 class) Si21-205 Fan Control Outline Fan control is carried out according to the following priority. 1. Fan ON control for electric component cooling fan 2. Fan control when defrosting 3. Fan OFF delay when stopped 4. ON/OFF control when cooling operation 5.
Page 106: Moisture Protection Function 2
Si21-205 Outdoor Unit (25/35 class) 3. The set of a constant DOA1CG, DOA2CG, DOA3CG, FCG7 and FCG8 have constants for Cooling / Heating separately and these constants are distinguished with a suffix c/w. Outdoor temperature DOA2CG DOA1CG DOA4CG DOA3CG The lower Cancelled FCG7 FCG8...
Page 107: Defrost Control
Outdoor Unit (25/35 class) Si21-205 2.12 Defrost Control Outline Heat Pump Only Defrosting is carried out by the cooling cycle (reverse cycle). The defrosting time or outdoor heat exchanger temperature must be more than its fixed value when finishing. Detail Conditions for Starting Defrost The starting conditions must be made with the outdoor air temperature and heat exchanger temperature.
Page 108: Electronic Expansion Valve Control
Si21-205 Outdoor Unit (25/35 class) 2.13 Electronic Expansion Valve Control Outline The following items are included in the electronic expansion valve control. Electronic expansion valve is fully closed 1. Electronic expansion valve is fully closed when turning on the power. 2.
Page 109 Outdoor Unit (25/35 class) Si21-205 2.13.1 Fully Closing with Power ON Initialize the electronic expansion valve when turning on the power, set the opening position and develop pressure equalizing. 2.13.2 Pressure Equalization Control When the compressor is stopped, open and close the electronic expansion valve and develop pressure equalization.
Page 110 Si21-205 Outdoor Unit (25/35 class) 2.13.7 Control when frequency is changed When the target discharge pipe temperature control is active, if the target frequency is changed for a specified value in a certain time period, cancel the target discharge pipe temperature control and change the target opening of the electronic expansion valve according to the shift.
Page 111: Malfunctions
Outdoor Unit (25/35 class) Si21-205 2.14 Malfunctions 2.14.1 Sensor Malfunction Detection Sensor malfunction may occur either in the thermistor or current transformer (CT) system. Relating to Thermistor Malfunction 1. Outdoor heat exchanger thermistor 2. Discharge pipe thermistor 3. Fin thermistor 4.
Page 112: Forced Operation Mode
Si21-205 Outdoor Unit (25/35 class) 2.15 Forced Operation Mode Outline Forced operating mode includes only forced cooling. Detail Forced Cooling Item Forced Cooling Forced operation 1) The outdoor unit is not abnormal allowing conditions and not in the 3-minute stand-by mode.
Page 113: Outdoor Unit (50/60 Class)
Outdoor Unit (50/60 class) Si21-205 3. Outdoor Unit (50/60 class) Function of Thermistor 3.1.1 Heat Pump Model Electrontic expansion valve Four way valve Compressor (R3077) A Outdoor Heat 1. The outdoor heat exchanger thermistor is used for controlling target discharge temperature. Set a target discharge temperature depending on the outdoor and indoor heat exchanger Exchanger temperature.
Page 114 Si21-205 Outdoor Unit (50/60 class) 3.1.2 Cooling Only Model Electrontic expansion valve Compressor (R3078) A Outdoor Heat 1. The outdoor heat exchanger thermistor is used for controlling target discharge temperature. Exchanger Set a target discharge temperature depending on the outdoor and indoor heat exchanger temperature.
Page 115: Mode Hierarchy
Outdoor Unit (50/60 class) Si21-205 Mode Hierarchy Outline There are two modes; the mode selected in user’s place (normal air conditioning mode) and forced operation mode for installation and providing service. Detail 1. For heat pump model There are following modes; stop, cooling (includes drying), heating (include defrosting) Air conditioner control mode Forced operating mode Forced cooling (for Pump Down Operation)
Page 116: Frequency Control
Si21-205 Outdoor Unit (50/60 class) Frequency Control Outline Frequency will be determined according to the difference between room and set temperature. The function is explained as follows. 1. How to determine frequency. 2. Frequency command from an indoor unit. (The difference between a room temperature and the temperature set by the remote controller.) 3.
Page 117 Outdoor Unit (50/60 class) Si21-205 3. Determine lower limit frequency Set a maximum value as an lower limit frequency among the frequency lower limits of the following functions: Pressure difference upkeep. 4. Determine prohibited frequency There is a certain prohibited frequency such as a power supply frequency. Indoor Frequency Command (∆D signal) The difference between a room temperature and the temperature set by the remote controller will be taken as the “∆D signal”...
Page 118: Controls At Mode Changing / Start-Up
Si21-205 Outdoor Unit (50/60 class) Controls at Mode Changing / Start-up 3.4.1 Preheating Operation Outline Operate the inverter in the open phase operation with the conditions including the preheating command (only for heat pump model) from the indoor, the outdoor air temperature and discharge pipe temperature.
Page 119: Discharge Pipe Temperature Control
Outdoor Unit (50/60 class) Si21-205 Discharge Pipe Temperature Control Outline The discharge pipe temperature is used as the compressor's internal temperature. If the discharge pipe temperature rises above a certain level, the operating frequency upper limit is set to keep this temperature from going up further. Detail Divide the Zone (R2836)
Page 120: Freeze-Up Protection Control
Si21-205 Outdoor Unit (50/60 class) Freeze-up Protection Control Outline During cooling operation, the signals being sent from the indoor unit allow the operating frequency limitation and then prevent freezing of the indoor heat exchanger. (The signal from the indoor unit must be divided into the zones as the followings. Detail Conditions for Start Controlling Judge the controlling start with the indoor heat exchanger temperature after 2 sec from...
Page 121: Fan Control
Outdoor Unit (50/60 class) Si21-205 Fan Control Outline Fan control is carried out according to the following priority. 1. Fan ON control for electric component cooling fan 2. Fan control when defrosting 3. Fan OFF delay when stopped 4. ON/OFF control in cooling operation 5.
Page 122: Low Hz High Pressure Limit
Si21-205 Outdoor Unit (50/60 class) 3.11 Low Hz High Pressure Limit Outline Heat Pump Only Set the upper limit of high pressure in a low Hz zone. Set the upper limit of the indoor heat exchanger temperature by its operating frequency of Hz. Separate into three zones, reset zone, unchanged zone and drooping zone and the frequency control must be carried out in such zones.
Page 123: Electronic Expansion Valve Control
Outdoor Unit (50/60 class) Si21-205 3.13 Electronic Expansion Valve Control Outline The following items are included in the electronic expansion valve control. Electronic expansion valve is fully closed 1. Electronic expansion valve is fully closed when turning on the power. 2.
Page 124 Si21-205 Outdoor Unit (50/60 class) 3.13.1 Fully Closing with Power ON Initialize the electronic expansion valve when turning on the power, set the opening position and develop pressure equalizing. 3.13.2 Pressure Equalization Control When the compressor is stopped, open and close the electronic expansion valve and develop pressure equalization.
Page 125 Outdoor Unit (50/60 class) Si21-205 3.13.7 Control when frequency is changed When the target discharge pipe temperature control is active, if the target frequency is changed for a specified value in a certain time period, cancel the target discharge pipe temperature control and change the target opening of the electronic expansion valve according to the shift.
Page 126: Malfunctions
Si21-205 Outdoor Unit (50/60 class) 3.14 Malfunctions 3.14.1 Sensor Malfunction Detection Sensor malfunction may occur either in the thermistor or current transformer (CT) system. Relating to Thermistor Malfunction 1. Outdoor heat exchanger thermistor 2. Discharge pipe thermistor 3. Fin thermistor 4.
Page 127: Forced Operation Mode
Outdoor Unit (50/60 class) Si21-205 3.15 Forced Operation Mode Outline Forced operating mode includes only forced cooling. Detail Forced Cooling Item Forced Cooling Forced operation 1) The outdoor unit is not abnormal allowing conditions and not in the 3-minute stand-by mode.
Page 128: Part 8 Troubleshooting
Si21-205 Part 8 Troubleshooting 1. Troubleshooting Based on Equipment Condition........119 1.1 Equipment does not operate............... 120 1.2 Indoor fan operates, but compressor does not........121 1.3 Cooling / Heating operation starts but stops immediately....123 1.4 After shutting down, equipment does not restart for a while....124 1.5 Equipment operates but does not provide cooling.
Page 129 Si21-205 6.5 Discharge Pipe Temperature Control ..........169 6.6 Position Sensor Abnormality ............... 170 6.7 CT or Related Abnormality ..............171 6.8 Thermistor or Related Abnormality (Outdoor Unit) ......173 6.9 Electrical Box Temperature Rise ............175 6.10 Radiation Fin Temperature Rise............177 6.11 Output Over Current Detection............
Page 130: Troubleshooting Based On Equipment Condition
Si21-205 Troubleshooting Based on Equipment Condition 1. Troubleshooting Based on Equipment Condition Equipment Condition Remedy Equipment does not operate. See page 120 Indoor fan operates, but compressor does See page 121 not. Cooling / heating operation starts but stops See page 123 immediately.
Page 131: Equipment Does Not Operate
Troubleshooting Based on Equipment Condition Si21-205 Equipment does not operate. Applicable Model All models of SkyAir series Error Detection Method Error Generating Condition Possible Causes Fuse blown or disorder of contact in operation circuit Faulty operation switch or contact point Faulty magnetic switch for fan motor Activation or fault of overcurrent relay for fan motor Faulty overcurrent relay for compressor...
Page 132: Indoor Fan Operates, But Compressor Does Not
Si21-205 Troubleshooting Based on Equipment Condition Indoor fan operates, but compressor does not. Applicable Model All models of SkyAir series Method of Malfunction Detection Malfunction Decision Conditions Possible Causes Faulty thermistor Faulty indoor/outdoor unit PCB Faulty magnetic switch Faulty power transistor Faulty compressor Troubleshooting...
Page 133 Troubleshooting Based on Equipment Condition Si21-205 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. · Indoor unit fan runs at set airflow rate. · (In cooling operation) When air thermistor ambient temperature is higher than set temperature ·...
Page 134: Cooling / Heating Operation Starts But Stops Immediately
Si21-205 Troubleshooting Based on Equipment Condition Cooling / Heating operation starts but stops immediately. Applicable Model All models of SkyAir series Error Detection Method Error Generating Condition Possible Cause Excess charge of refrigerant Air intrudes into refrigerant system Faulty magnetic switch for outdoor unit fan motor Faulty aux.
Page 135: After Shutting Down, Equipment Does Not Restart For A While
Troubleshooting Based on Equipment Condition Si21-205 After shutting down, equipment does not restart for a while. Applicable Model All models of SkyAir series Error Detection Method Error Generating Condition Possible Cause Overcurrent relay (for compressor) Compressor protection thermostat Overcurrent relay may act due to the following reasons Lower voltage of power supply Excess level of high pressure Insufficient size of power cable...
Page 136: Equipment Operates But Does Not Provide Cooling
Si21-205 Troubleshooting Based on Equipment Condition Equipment operates but does not provide cooling. Applicable Model All models of SkyAir series Error Detection Method Error Generating Condition Possible Cause Overcurrent relay (for compressor) Compressor protection thermostat Overcurrent relay may act due to the following reasons Lower voltage of power supply Excess level of high pressure Insufficient size of power cable...
Page 137 Troubleshooting Based on Equipment Condition Si21-205 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Be sure to turn off power switch before connect or disconnect connector, Caution Caution or parts damage may be occurred. or parts damage may be occurred. Measure the temperature of Measure the temperature of suction air and supply air.
Page 138: Equipment Operates But Does Not Provide Heating
Si21-205 Troubleshooting Based on Equipment Condition Equipment operates but does not provide heating. Applicable Model All models of SkyAir series Error Detection Method Error Generating Condition Possible Cause Excess charge of refrigerant Air intrudes into refrigerant system Faulty magnetic switch for outdoor unit fan motor Faulty aux.
Page 139: Equipment Discharges White Mist
Troubleshooting Based on Equipment Condition Si21-205 Equipment discharges white mist. Applicable Model All models of SkyAir series Error Detection Method Error Generating Condition Possible Cause Humid installation site Installation site is dirty and with dense oil mists. Soiled heat exchanger Clogged air filter Malfunction of fan motor Troubleshooting...
Page 140: Equipment Produces Loud Noise Or Shakes
Si21-205 Troubleshooting Based on Equipment Condition Equipment produces loud noise or shakes. Applicable Model All models of SkyAir series Error Detection Method Error Generating Condition Possible Cause Faulty installation Excess charge of refrigerant Air intrudes into refrigerant system Flushing noise due to refrigerant shortage. (Sound of shoo...) Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution...
Page 141: Equipment Discharges Dust
Troubleshooting Based on Equipment Condition Si21-205 Equipment discharges dust. Applicable Model All models of SkyAir series Error Detection Method Error Generating Condition Possible Cause Carpet spread room Animal's hair Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred.
Page 142: Remote Controller Lcd Displays "88
Si21-205 Troubleshooting Based on Equipment Condition 1.10 Remote controller LCD displays "88". Applicable Model All models of SkyAir series Error Detection Method Error Generating Condition Possible Cause Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred.
Page 143: Swing Flap Does Not Operate
Troubleshooting Based on Equipment Condition Si21-205 1.11 Swing flap does not operate. Applicable FFQ-B, FHQ-BU Models Method of Utilizes ON/OFF of the limit switch when the motor turns. Malfunction Detection Malfunction When ON/OFF of the micro switch for positioning cannot be reversed even through the swing flap motor for a specified amount of time (about 30 seconds).
Page 144: Self-Diagnosis By Remote Controller
Si21-205 Self-Diagnosis by Remote Controller 2. Self-Diagnosis by Remote Controller The INSPECTION/TEST Button Explanation The following modes can be selected by using the [Inspection/Test Operation] button on the remote control. Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred.
Page 145: Self-Diagnosis By Wired Remote Controller
Self-Diagnosis by Remote Controller Si21-205 Self-Diagnosis by Wired Remote Controller Explanation If operation stops due to malfunction, the remote controller’s operation LED blinks, and malfunction code is displayed. (Even if stop operation is carried out, malfunction contents are displayed when the inspection mode is entered.) The malfunction code enables you to tell what kind of malfunction caused operation to stop.
Page 146: Self-Diagnosis By Wireless Remote Controller
Si21-205 Self-Diagnosis by Remote Controller Self Diagnosis by Wireless Remote Controller If equipment stops due to a malfunction, the operation indicating LED on the light reception section flashes. The malfunction code can be determined by following the procedure described below. (The malfunction code is displayed when an operation error has occurred.
Page 147 Self-Diagnosis by Remote Controller Si21-205 Normal status Enters inspection mode from normal status when the INSPECTION/ TEST button is pressed. 1 Press INSPECTION/TEST button. If no button is pressed for 1 minute, equipment returns to normal status. Press MODE selector button.
Page 148: Remote Controller Display Malfunction Code And Contents
Si21-205 Self-Diagnosis by Remote Controller Remote Controller Display Malfunction Code and Contents Code Malfunction / Remarks Indoor unit’s PC board faulty Drain water level abnormal Freeze-up protector “or stopped by high pressure control” Indoor fan motor overloaded, overcurrent or locked (Note 1) Swing flap motor malfunction/Lock Failure of Drain System Air cleaner faulty...
Page 149: Self-Diagnosis By Led
Self-Diagnosis by LED Si21-205 3. Self-Diagnosis by LED Self-Diagnosis with the LED on the Indoor Unit Foreword Troubleshooting can be carried out by service monitor LED (green). (Blinks when normal) : LED on : LED off : LED blinks — : No connection with troubleshooting Microcomputer Contents/Processing Normal Monitor...
Page 150: Error Codes And Led Indication
Si21-205 Error Codes and LED Indication 4. Error Codes and LED Indication Symbols : Blinks : On : Off — : No connection with troubleshooting : High probability of malfunction : Possibility of malfunction : Low probability of malfunction — : No possibility of malfunction (do not replace) System Remote Location of Malfunction...
Page 151 Error Codes and LED Indication Si21-205 Indoor Unit Indoor Remote Location of Malfunction Contents of Malfunction Details of Controller Malfunction Unit Display (Reference Page) Display Other PC Board than PC Outdoor Indoor Remote Board Controller Unit Unit Normal → to outdoor unit —...
Page 152 Si21-205 Error Codes and LED Indication Outdoor Unit Reference Page Code Indication Description 25/35 class 50/60 class OL activation (compressor overload) Compressor lock DC fan lock — Input over current detection Four way valve abnormality Discharge pipe temperature control High pressure control in cooling Position sensor abnormality CT or related abnormality Outdoor air thermistor or related abnormality...
Page 153: Troubleshooting For Indoor Unit
Troubleshooting for Indoor Unit Si21-205 5. Troubleshooting for Indoor Unit Failure of Indoor Unit PC Board Remote Controller Display Applicable FFQ-B & FHQ-BU Models Method of Check data from E∑PROM. Malfunction Detection Malfunction When data could not be correctly received from the E∑PROM Decision E∑PROM : Type of nonvolatile memory.
Page 154: Malfunction Of Drain Water Level System (Float Type)
Si21-205 Troubleshooting for Indoor Unit Malfunction of Drain Water Level System (Float Type) Remote Controller Display Applicable FFQ-B & FHQ-BU Models Method of By float switch OFF detection Malfunction Detection Malfunction When rise of water level is not a condition and the float switch goes OFF. Decision Conditions Supposed...
Page 155 Troubleshooting for Indoor Unit Si21-205 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. If “A3” is detected by a PC board which is not mounted with X15A, the PC board is defective. Is the short-circuit Is drain...
Page 156: Failure Of Drain System
Si21-205 Troubleshooting for Indoor Unit Failure of Drain System Remote Controller Display Applicable FHQ-BU Models Method of Water leakage is detected based on float switch ON/OFF operation while the compressor is in Malfunction non-operation. Detection Malfunction When the float switch changes from ON to OFF while the compressor is in non-operation. Decision Conditions Supposed...
Page 157: Indoor Unit Fan Motor Lock
Troubleshooting for Indoor Unit Si21-205 Indoor Unit Fan Motor Lock Remote Controller Display Applicable FHQ-BU Models Method of Detection by failure of signal for detecting number of turns to come from the fan motor Malfunction Detection Malfunction When number of turns can’t be detected even when output voltage to the fan is maximum Decision Conditions Supposed...
Page 158: Malfunction Of Indoor Unit Fan Motor
Si21-205 Troubleshooting for Indoor Unit Malfunction of Indoor Unit Fan Motor Remote Controller Display Applicable FFQ-B Models Method of Detection of abnormal fan speed by signal from the fan motor Malfunction Detection Malfunction When fan speed does not increase Decision Conditions Supposed Disconnection, short circuit or disengagement of connector in fan motor harness...
Page 159 Troubleshooting for Indoor Unit Si21-205 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.1 Turn off the power supply. Refer to P.162 Is there any foreign matter Remove the foreign matter.
Page 160: Swing Flap Motor Malfunction / Lock
Si21-205 Troubleshooting for Indoor Unit Swing Flap Motor Malfunction / Lock Remote Controller Display Applicable FHQ-BU Models Method of Utilizes ON/OFF of the limit switch when the motor turns. Malfunction Detection Malfunction When ON/OFF of the microswitch for positioning cannot be reversed even though the swing flap Decision motor is energized for a specified amount of time (about 30 seconds).
Page 161 Troubleshooting for Indoor Unit Si21-205 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. the connectors correctly connected Connect correctly. to X29A and X14A on the PC board? the limit switch's transfer Connect correctly.
Page 162: Failure Of Capacity Setting
Si21-205 Troubleshooting for Indoor Unit Failure of Capacity Setting Remote Controller Display Applicable FFQ-B, FHQ-BU Models Method of Capacity is determined according to resistance of the capacity setting adaptor and the memory Malfunction inside the IC memory on the indoor unit PC board, and whether the value is normal or abnormal is determined.
Page 163: Malfunction Of Heat Exchanger Thermistor (R2T)
Troubleshooting for Indoor Unit Si21-205 Malfunction of Heat Exchanger Thermistor (R2T) Remote Controller Display Applicable FFQ-B, FHQ-BU Models Method of Malfunction detection is carried out by temperature detected by heat exchanger sensor. Malfunction Detection Malfunction When the heat exchanger thermistor becomes disconnected or shorted while the unit is running. Decision Conditions Supposed...
Page 164: Malfunction Of Heat Exchanger Thermistor (R3T)
Si21-205 Troubleshooting for Indoor Unit Malfunction of Heat Exchanger Thermistor (R3T) Remote Controller Display Applicable FFQ-B, FHQ-BU Models Method of Malfunction detection is carried out by temperature detected by heat exchanger sensor (R3T). Malfunction Detection Malfunction When the heat exchanger thermistor becomes disconnected or shorted while the unit is running. Decision Conditions Supposed...
Page 165: Malfunction Of Suction Air Thermistor
Troubleshooting for Indoor Unit Si21-205 5.10 Malfunction of Suction Air Thermistor Remote Controller Display Applicable FFQ-B, FHQ-BU Models Method of Malfunction detection is carried out by temperature detected by suction air temperature sensor. Malfunction Detection Malfunction When the suction air temperature sensor’s thermistor becomes disconnected or shorted while Decision the unit is running.
Page 166: Malfunction Of Remote Controller Thermistor
Si21-205 Troubleshooting for Indoor Unit 5.11 Malfunction of Remote Controller Thermistor Remote Controller Display Applicable FFQ-B, FHQ-BU Models Method of Even if remote controller thermistor is faulty, system is possible to operate by system thermistor. Malfunction Malfunction detection is carried out by temperature detected by remote controller thermistor. Detection Malfunction When the remote controller thermistor becomes disconnected or shorted while the unit is...
Page 167: Transmission Error (Between Indoor And Outdoor Unit)
Troubleshooting for Indoor Unit Si21-205 5.12 Transmission Error (Between Indoor and Outdoor Unit) Remote Controller Display Applicable FFQ-B, FHQ-BU Models Method of Microcomputer checks if transmission between indoor and outdoor units is normal. Malfunction Detection Malfunction When transmission is not carried out normally for a certain amount of time Decision Conditions Supposed...
Page 168: Transmission Error (Between Indoor Unit And Remote Controller)
Si21-205 Troubleshooting for Indoor Unit 5.13 Transmission Error (Between Indoor Unit and Remote Controller) Remote Controller Display Applicable FFQ-B, FHQ-BU Models Method of Microcomputer checks if transmission between indoor unit and remote controller is normal. Malfunction Detection Malfunction When transmission is not carried out normally for a certain amount of time Decision Conditions Supposed...
Page 169: Transmission Error (Between Main And Sub Remote Controller)
Troubleshooting for Indoor Unit Si21-205 5.14 Transmission Error (Between Main and Sub Remote Controller) Remote Controller Display Applicable FFQ-B, FHQ-BU Models Method of In case of controlling with 2- remote controller, check the system using microcomputer if signal transmission between indoor unit and remote controller (main and sub) is normal. Malfunction Detection Malfunction...
Page 170: Malfunction Of Field Setting Switch
Si21-205 Troubleshooting for Indoor Unit 5.15 Malfunction of Field Setting Switch Remote Controller Display Applicable FFQ-B, FHQ-BU Models Method of Malfunction Detection Malfunction Incorrect field setting The number of indoor units connected to this system is more than limited. Decision Conditions Supposed Indoor-Outdoor, Indoor-Indoor transmission line...
Page 171 Troubleshooting for Indoor Unit Si21-205 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Is the number of indoor Connect correctly. units connected this sytem correct? Is the remote controller Connect the remote controller connected to one or more correctly.
Page 172: Centralized Address Setting Error
Si21-205 Troubleshooting for Indoor Unit 5.16 Centralized Address Setting Error Remote Controller Display Applicable FFQ-B, FHQ-BU Models Method of Indoor unit microcomputer detects and judges the centralized address signal according to the Malfunction transmission between indoor units. Detection Malfunction When the microcomputer judges that the centralized address signal is duplicated Decision Conditions Supposed...
Page 173: Checks For Indoor Unit
Troubleshooting for Indoor Unit Si21-205 5.17 Checks for Indoor Unit Check No. 1 Check for Fan Motor Connector (Power Supply Line) (1) Turn the power supply off. With the relay connector disconnected, measure the resistance between UVW phases of the connector (3 cores) at the motor side, then make sure that the resistance between each phase is balanced and not short-circuited.
Page 174 Si21-205 Troubleshooting for Indoor Unit Check No. 2 Check for Thermistors Disconnect the thermistor connector from PC board, then measure the resistance by using a tester. Unit : kΩ Thermistor temperature and resistance characteristics Temperature ˚C -6.0 90.8 88.0 -4.0 81.7 79.1 -2.0...
Page 175: Troubleshooting For Outdoor Unit (25/35 Class)
Troubleshooting for Outdoor Unit (25/35 class) Si21-205 6. Troubleshooting for Outdoor Unit (25/35 class) OL Activation (Compressor Overload) Remote Controller Display Method of A compressor overload is detected through compressor OL. Malfunction Detection Malfunction If the compressor OL is activated twice, the system will be shut down. Decision The error counter will reset itself if this or any other error does not occur during the following 60-minute compressor running time (total time).
Page 176: Compressor Lock
Si21-205 Troubleshooting for Outdoor Unit (25/35 class) Compressor Lock Remote Controller Display Method of A compressor lock is detected by checking the compressor running condition through the Malfunction position detection circuit. Detection Malfunction The system judges the compressor lock, and stops due to over current. Decision The system judges the compressor lock, and cannot operation with position detection within 15 seconds after start up.
Page 177: Input Over Current Detection
Troubleshooting for Outdoor Unit (25/35 class) Si21-205 Input Over Current Detection Remote Controller Display Method of An input over-current is detected by checking the input current value being detected by CT with Malfunction the compressor running. Detection Malfunction The following CT input with the compressor running continues for 2.5 seconds. Decision Cooling: Above 11A, Heating: Above 13A Conditions...
Page 178: Four Way Valve Abnormality
Si21-205 Troubleshooting for Outdoor Unit (25/35 class) Four Way Valve Abnormality Remote Controller Display Method of The indoor air temperature thermistor, the indoor unit heat exchanger thermistor, the outdoor Malfunction temperature thermistor and the outdoor unit heat exchanger thermistor are checked to see if they function within their normal ranges in the operating mode.
Page 179 Troubleshooting for Outdoor Unit (25/35 class) Si21-205 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.5 Refer to P.188 Four way valve coil Correct. disconnected (loose)? Check No.6 Refer to P.189 Harness out of connector? Reconnect.
Page 180: Discharge Pipe Temperature Control
Si21-205 Troubleshooting for Outdoor Unit (25/35 class) Discharge Pipe Temperature Control Remote Controller Display Method of The discharge pipe temperature control (stop, frequency drooping, etc.) is checked with the Malfunction temperature being detected by the discharge pipe thermistor. Detection Malfunction If a stop takes place 6 times successively due to abnormal discharge pipe temperature, the Decision system will be shut down.
Page 181: Position Sensor Abnormality
Troubleshooting for Outdoor Unit (25/35 class) Si21-205 Position Sensor Abnormality Remote Controller Display Method of A compressor startup failure is detected by checking the compressor running condition through Malfunction the position detection circuit. Detection Malfunction The compressor fails to start in about 15 seconds after the compressor run command signal Decision is sent.
Page 182: Ct Or Related Abnormality
Si21-205 Troubleshooting for Outdoor Unit (25/35 class) CT or Related Abnormality Remote Controller Display Method of A CT or related error is detected by checking the compressor running frequency and CT- Malfunction detected input current. Detection Malfunction The compressor running frequency is below 62 Hz and the CT input is below 0.1 V. Decision (The input current is also below 0.5 A.) If this error repeats 4 times, the system will be shut down.
Page 183 Troubleshooting for Outdoor Unit (25/35 class) Si21-205 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.12 Turn off the power and turn it on Refer to P.193 again.
Page 184: Thermistor Or Related Abnormality (Outdoor Unit)
Si21-205 Troubleshooting for Outdoor Unit (25/35 class) Thermistor or Related Abnormality (Outdoor Unit) P4, J3, J6, H9 Remote Controller Display Method of This type of error is detected by checking the thermistor input voltage to the microcomputer. Malfunction [A thermistor error is detected by checking the temperature.] Detection Malfunction The thermistor input is above 4.96 V or below 0.04 V with the power on.
Page 185 Troubleshooting for Outdoor Unit (25/35 class) Si21-205 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.6 Refer to P.189 Turn on the power again. Error displayed again Reconnect.
Page 186: Electrical Box Temperature Rise
Si21-205 Troubleshooting for Outdoor Unit (25/35 class) Electrical Box Temperature Rise Remote Controller Display Method of An electrical box temperature rise is detected by checking the radiation fin thermistor with the Malfunction compressor off. Detection Malfunction With the compressor off, the radiation fin temperature is above 122˚C. (Reset is made when the Decision temperature drops below 113˚C.) Conditions...
Page 187 Troubleshooting for Outdoor Unit (25/35 class) Si21-205 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.6 WARNING Turn off the power and turn it on Refer to P.189 again.
Page 188: Radiation Fin Temperature Rise
Si21-205 Troubleshooting for Outdoor Unit (25/35 class) 6.10 Radiation Fin Temperature Rise Remote Controller Display Method of A radiation fin temperature rise is detected by checking the radiation fin thermistor with the Malfunction compressor on. Detection Malfunction If the radiation fin temperature with the compressor on is above 81˚C, Decision If a radiation fin temperature rise takes place 4 times successively, the system will be shut down.
Page 189 Troubleshooting for Outdoor Unit (25/35 class) Si21-205 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.6 Turn off the power and turn it on Refer to P.189 again to get the system started.
Page 190: Output Over Current Detection
Si21-205 Troubleshooting for Outdoor Unit (25/35 class) 6.11 Output Over Current Detection Remote Controller Display Method of An output over-current is detected by checking the current that flows in the inverter DC section. Malfunction Detection Malfunction A position signal error occurs while the compressor is running. Decision A speed error occurs while the compressor is running.
Page 191 Troubleshooting for Outdoor Unit (25/35 class) Si21-205 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. ∗ An output over-current may result from wrong internal wiring. If the wires have been disconnected and Check No.7 reconnected for part replacement, for example, and the system is interrupted by an output over-current, take the following procedure.
Page 192: Insufficient Gas
Si21-205 Troubleshooting for Outdoor Unit (25/35 class) 6.12 Insufficient Gas Remote Controller Display Method of Gas shortage detection I : A gas shortage is detected by checking the CT-detected input current Malfunction value and the compressor running frequency. Gas shortage detection II : A gas shortage is detected by checking the difference between Detection indoor unit heat exchanger temperature and room temperature as well as the difference between outdoor unit heat exchanger temperature and room temperature.
Page 193 Troubleshooting for Outdoor Unit (25/35 class) Si21-205 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.4 Refer to P.187 Any thermistor Reconnect in position. disconnected? * Discharge pipe thermistor * Indoor / outdoor unit heat exchanger thermistor * Room temperature thermistor Check No.6...
Page 194: Over-Voltage Detection
Si21-205 Troubleshooting for Outdoor Unit (25/35 class) 6.13 Over-voltage Detection Remote Controller Display Method of An abnormal voltage rise is detected by checking the specified over-voltage detection circuit. Malfunction Detection Malfunction An over-voltage signal is fed from the over-voltage detection circuit to the microcomputer Decision (The voltage is over 400V).
Page 195: High Pressure Control In Cooling
Troubleshooting for Outdoor Unit (25/35 class) Si21-205 6.14 High Pressure Control in Cooling Remote Controller Display Method of High-pressure control (stop, frequency drop, etc.) is activated in the cooling mode if the Malfunction temperature being sensed by the heat exchanger thermistor exceeds the limit. Detection Malfunction Activated when the temperature being sensed by the heat exchanger thermistor rises above...
Page 196 Si21-205 Troubleshooting for Outdoor Unit (25/35 class) Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.4 Check the installation space. Refer to P.187 Check No.7 Abnormal Check No.6 Installation condition Change the air outlet grille Refer to P.189...
Page 197: Checks For Outdoor Unit (25/35 Class)
Troubleshooting for Outdoor Unit (25/35 class) Si21-205 6.15 Checks for Outdoor Unit (25/35 class) 6.15.1 Fan Motor Connector Output Check Check No.01 1. Check connector connection. 2. Check motor power supply voltage output (pins 4-7 and 4-8). 3. Check motor control voltage (pins 4-3). 4.
Page 198 Si21-205 Troubleshooting for Outdoor Unit (25/35 class) 6.15.2 Electronic Expansion Valve Check Check No.4 Conduct the followings to check the electronic expansion valve (EV). 1. Check to see if the EV connector is correctly inserted in the PCB. Compare the EV unit and the connector number.
Page 199 Troubleshooting for Outdoor Unit (25/35 class) Si21-205 6.15.3 Four Way Valve Performance Check Check No.5 Turn off the power and turn it on again. ∗ Four way valve coil Cooling / dry : No continuity Start the heating-mode run. Heating : Continuity S80 voltage at DC 180-220 V with Replace the outdoor unit...
Page 200 Si21-205 Troubleshooting for Outdoor Unit (25/35 class) 6.15.4 Thermistor Resistance Check Check No.6 Remove the connectors of the thermistors on the PCB, and measure the resistance of each thermistor using tester. The relationship between normal temperature and resistance is shown in the graph and the table below.
Page 201 Troubleshooting for Outdoor Unit (25/35 class) Si21-205 6.15.5 Installation Condition Check Check No.7 Installation condition check Check the allowable Abnormal Change the position of the air dimensions of the air suction discharge grille or the and discharge area. installation location. Normal Does the discharged...
Page 202 Si21-205 Troubleshooting for Outdoor Unit (25/35 class) 6.15.7 Outdoor Unit Fan System Check (With AC Motor) Check No.9 Check the outdoor fan system. Abnormal Check the Does the outdoor fan motor lead wire Repair. fan rotate? connector for secure connection. Normal Does Are the...
Page 203 Troubleshooting for Outdoor Unit (25/35 class) Si21-205 6.15.8 Power Supply Waveforms Check Check No.10 Measure the power supply waveform between pins 1 and 3 on the terminal board, and check the waveform disturbance. Check to see if the power supply waveform is a sine wave (Fig.1). Check to see if there is waveform disturbance near the zero cross (sections circled in Fig.2) [Fig.1] [Fig.2]...
Page 204 Si21-205 Troubleshooting for Outdoor Unit (25/35 class) 6.15.10Capacitor Voltage Check Check No.12 < Measuring method > Before measuring, operate the unit for several minutes, then shut down the operation by force using the circuit breaker. If the unit is shut down using the remote controller instead of the circuit breaker, the capacitor discharges the electric load, thus disallowing accurate measurement.
Page 205: Hall Ic Check
Troubleshooting for Outdoor Unit (25/35 class) Si21-205 <Measuring positions> MULTIMETER (DC, VOLTAGA RANGE) TRM1 S90 THERMISTOR LEAD WIRE S80 FOUR WAY VALVE LEAD WIRE (Heating Pump only) S70 FAN MOTOR LEAD WIRE REACTOR LEAD WIRE COMPRESSOR LEAD WIRE (R2956) 6.15.12Hall IC Check Check No.16 1.
Page 206: Troubleshooting For Outdoor Unit (50/60 Class)
Si21-205 Troubleshooting for Outdoor Unit (50/60 class) 7. Troubleshooting for Outdoor Unit (50/60 class) OL Activation (Compressor Overload) Remote Controller Display Method of A compressor overload is detected through compressor OL. Malfunction Detection Malfunction If the compressor OL is activated twice, the system will be shut down. Decision The error counter will reset itself if this or any other error does not occur during the following 60-minute compressor running time (total time).
Page 207: Compressor Lock
Troubleshooting for Outdoor Unit (50/60 class) Si21-205 Compressor Lock Remote Controller Display Method of A compressor lock is detected by checking the compressor running condition through the Malfunction position detection circuit. Detection Malfunction The position detection circuit detects a compressor frequency of below 10 Hz for 20 seconds Decision or a frequency of above 160 Hz.
Page 208: Dc Fan Lock
Si21-205 Troubleshooting for Outdoor Unit (50/60 class) DC Fan Lock Remote Controller Display Method of A fan motor or related error is detected by checking the high-voltage fan motor rpm being Malfunction detected by the hall IC. Detection Malfunction The fan does not start in 30 seconds even when the fan motor is running. Decision The system will be shut down if the error occurs 16 times.
Page 209: Input Over Current Detection
Troubleshooting for Outdoor Unit (50/60 class) Si21-205 Input Over Current Detection Remote Controller Display Method of An input over-current is detected by checking the input current value being detected by CT with Malfunction the compressor running. Detection Malfunction The following CT input with the compressor running continues for 2.5 seconds. Decision CT input : Above 20 A The system will be shut down if the error occurs 16 times.
Page 210 Si21-205 Troubleshooting for Outdoor Unit (50/60 class) Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.7 ∗ An input over-current may result from wrong internal wiring. If the wires have been disconnected and reconnected for part replacement, for example, and the system is interrupted by an input over-current, Refer to P.223 take the following procedure.
Page 211: Four Way Valve Abnormality
Troubleshooting for Outdoor Unit (50/60 class) Si21-205 Four Way Valve Abnormality Remote Controller Display Method of The room temperature thermistor, the indoor unit heat exchanger thermistor, the outdoor Malfunction temperature thermistor and the outdoor unit heat exchanger thermistor are checked to see if they function within their normal ranges in the operating mode.
Page 212 Si21-205 Troubleshooting for Outdoor Unit (50/60 class) Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.5 Refer to P.221 Four way valve coil Correct. disconnected (loose)? Check No.6 Refer to P.222 Harness out of connector? Reconnect.
Page 213: Discharge Pipe Temperature Control
Troubleshooting for Outdoor Unit (50/60 class) Si21-205 Discharge Pipe Temperature Control Remote Controller Display Method of The discharge pipe temperature control (stop, frequency drooping, etc.) is checked with the Malfunction temperature being detected by the discharge pipe thermistor. Detection Malfunction If a stop takes place 6 times successively due to abnormal discharge pipe temperature, the Decision system will be shut down.
Page 214: Position Sensor Abnormality
Si21-205 Troubleshooting for Outdoor Unit (50/60 class) Position Sensor Abnormality Remote Controller Display Method of A compressor startup failure is detected by checking the compressor running condition through Malfunction the position detection circuit. Detection Malfunction The compressor fails to start in about 15 seconds after the compressor run command signal Decision is sent.
Page 215: Ct Or Related Abnormality
Troubleshooting for Outdoor Unit (50/60 class) Si21-205 CT or Related Abnormality Remote Controller Display Method of A CT or related error is detected by checking the compressor running frequency and CT- Malfunction detected input current. Detection Malfunction The compressor running frequency is below 55 Hz and the CT input is below 0.1 V. Decision (The input current is also below 1.25 A.) If this error repeats 4 times, the system will be shut down.
Page 216: Si21
Si21-205 Troubleshooting for Outdoor Unit (50/60 class) Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.12 Turn off the power and turn it on Refer to P.226 again.
Page 217: Thermistor Or Related Abnormality (Outdoor Unit)
Troubleshooting for Outdoor Unit (50/60 class) Si21-205 Thermistor or Related Abnormality (Outdoor Unit) P4, J3, J6, H9 Remote Controller Display Method of This type of error is detected by checking the thermistor input voltage to the microcomputer. Malfunction [A thermistor error is detected by checking the temperature.] Detection Malfunction The thermistor input is above 4.96 V or below 0.04 V with the power on.
Page 218 Si21-205 Troubleshooting for Outdoor Unit (50/60 class) Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.6 Turn on the power again. Refer to P.222 Error displayed again Reconnect.
Page 219: Electrical Box Temperature Rise
Troubleshooting for Outdoor Unit (50/60 class) Si21-205 7.10 Electrical Box Temperature Rise Remote Controller Display Method of An electrical box temperature rise is detected by checking the radiation fin thermistor with the Malfunction compressor off. Detection Malfunction With the compressor off, the radiation fin temperature is above 80˚C. (Reset is made when the Decision temperature drops below 70˚C.) Conditions...
Page 220 Si21-205 Troubleshooting for Outdoor Unit (50/60 class) Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.6 WARNING Turn off the power and turn it on Refer to P.222 again.
Page 221: Radiation Fin Temperature Rise
Troubleshooting for Outdoor Unit (50/60 class) Si21-205 7.11 Radiation Fin Temperature Rise Remote Controller Display Method of A radiation fin temperature rise is detected by checking the radiation fin thermistor with the Malfunction compressor on. Detection Malfunction If the radiation fin temperature with the compressor on is above 90˚C, Decision If a radiation fin temperature rise takes place 4 times successively, the system will be shut down.
Page 222 Si21-205 Troubleshooting for Outdoor Unit (50/60 class) Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.6 Turn off the power and turn it on Refer to P.222 again to get the system started.
Page 223: Output Over Current Detection
Troubleshooting for Outdoor Unit (50/60 class) Si21-205 7.12 Output Over Current Detection Remote Controller Display Method of An output over-current is detected by checking the current that flows in the inverter DC section. Malfunction Detection Malfunction A position signal error occurs while the compressor is running. Decision A speed error occurs while the compressor is running.
Page 224 Si21-205 Troubleshooting for Outdoor Unit (50/60 class) Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. ∗ An output over-current may result from wrong internal wiring. If the wires have been disconnected and Check No.7 reconnected for part replacement, for example, and the system is interrupted by an output over-current, take the following procedure.
Page 225: Insufficient Gas
Troubleshooting for Outdoor Unit (50/60 class) Si21-205 7.13 Insufficient Gas Remote Controller Display Method of Gas shortage detection I : A gas shortage is detected by checking the CT-detected input current Malfunction value and the compressor running frequency. Gas shortage detection II : A gas shortage is detected by checking the difference between Detection indoor unit heat exchanger temperature and room temperature as well as the difference between outdoor unit heat exchanger temperature and room temperature.
Page 226 Si21-205 Troubleshooting for Outdoor Unit (50/60 class) Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.4 Refer to P.220 Any thermistor Reconnect in position. disconnected? * Discharge pipe thermistor * Indoor / outdoor unit heat exchanger thermistor * Room temperature thermistor Check No.6...
Page 227: Low-Voltage Detection
Troubleshooting for Outdoor Unit (50/60 class) Si21-205 7.14 Low-voltage Detection Remote Controller Display Method of An abnormal voltage rise or drop is detected by checking the detection circuit or DC voltage Malfunction detection circuit. Detection Malfunction An over-voltage signal is fed from the over-voltage detection circuit to the microcomputer, or Decision the voltage being detected by the DC voltage detection circuit is judged to be below 150 V for 0.1 second.
Page 228: High Pressure Control In Cooling
Si21-205 Troubleshooting for Outdoor Unit (50/60 class) 7.15 High Pressure Control in Cooling Remote Controller Display Method of High-pressure control (stop, frequency drop, etc.) is activated in the cooling mode if the Malfunction temperature being sensed by the heat exchanger thermistor exceeds the limit. Detection Malfunction Activated when the temperature being sensed by the heat exchanger thermistor rises above...
Page 229 Troubleshooting for Outdoor Unit (50/60 class) Si21-205 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check No.4 Check the installation space. Refer to P.220 Check No.7 Abnormal Check No.6 Installation condition Change the air outlet grille check...
Page 230: Checks For Outdoor Unit (50/60 Class)
Si21-205 Troubleshooting for Outdoor Unit (50/60 class) 7.16 Checks for Outdoor Unit (50/60 class) 7.16.1 Fan Motor Connector Output Check Check No.01 1. Check connector connection. 2. Check motor power supply voltage output (pins 4-7 and 4-8). 3. Check motor control voltage (pins 4-3). 4.
Page 231 Troubleshooting for Outdoor Unit (50/60 class) Si21-205 7.16.2 Electronic Expansion Valve Check Check No.4 Conduct the followings to check the electronic expansion valve (EV). 1. Check to see if the EV connector is correctly inserted in the PCB. Compare the EV unit and the connector number.
Page 232 Si21-205 Troubleshooting for Outdoor Unit (50/60 class) 7.16.3 Four Way Valve Performance Check Check No.5 Turn off the power and turn it on again. ∗ Four way valve coil Cooling / dry : No continuity Start the heating-mode run. Heating : Continuity S80 voltage at DC 180-220 V with Replace the outdoor unit...
Page 233 Troubleshooting for Outdoor Unit (50/60 class) Si21-205 7.16.4 Thermistor Resistance Check Check No.6 Remove the connectors of the thermistors on the PCB, and measure the resistance of each thermistor using tester. The relationship between normal temperature and resistance is shown in the graph and the table below.
Page 234 Si21-205 Troubleshooting for Outdoor Unit (50/60 class) 7.16.5 Installation Condition Check Check No.7 Installation condition check Check the allowable Abnormal Change the position of the air dimensions of the air suction discharge grille or the and discharge area. installation location. Normal Does the discharged...
Page 235 Troubleshooting for Outdoor Unit (50/60 class) Si21-205 7.16.6 Discharge Pressure Check Check No.8 Discharge pressure check High Replace compessor. Open the stop valve. Is the stop valve open? Is the Replace the pipe installed at connection pipe deformed? the site. Dirty Are the heat exchanger and Clean.
Page 236 Si21-205 Troubleshooting for Outdoor Unit (50/60 class) 7.16.8 Power Supply Waveforms Check Check No.10 Measure the power supply waveform between pins 1 and 3 on the terminal board, and check the waveform disturbance. Check to see if the power supply waveform is a sine wave (Fig.1). Check to see if there is waveform disturbance near the zero cross (sections circled in Fig.2) [Fig.1] [Fig.2]...
Page 237 Troubleshooting for Outdoor Unit (50/60 class) Si21-205 7.16.10Capacitor Voltage Check Check No.12 Before this checking, be sure to check the main circuit for short-circuit. Checking the capacitor voltage With the circuit breaker still on, measure the voltage according to the drawing of the model in question.
Page 238: Main Circuit Electrolytic Capacitor Check
Si21-205 Troubleshooting for Outdoor Unit (50/60 class) 7.16.12Main Circuit Electrolytic Capacitor Check Check No.14 Checking the main circuit electrolytic capacitor Never touch any live parts for at least 10 minutes after turning off the circuit breaker. If unavoidably necessary to touch a live part, make sure there is no DC voltage using the tester.
Page 239 Troubleshooting for Outdoor Unit (50/60 class) Si21-205 Troubleshooting...
Page 240: Part 9 Removal Procedure
Si21-205 Part 9 Removal Procedure 1. FFQ25/35/50/60BV1B.................230 1.1 Removal of Suction Grille ..............230 1.2 Removal of Air Filter ................231 1.3 Removal of Decoration Panel.............. 232 1.4 Removal of Horizontal Vane..............234 1.5 Removal of Swing Motor ..............236 1.6 Removal of Switch Box................
Page 241: Ffq25/35/50/60Bv1B
FFQ25/35/50/60BV1B Si21-205 1. FFQ25/35/50/60BV1B Removal of Suction Grille Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Removing the suction grille To remove the suction grille, slide the two tabs simultaneously and pull the suction grille down slowly.
Page 242: Removal Of Air Filter
Si21-205 FFQ25/35/50/60BV1B Removal of Air Filter Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Removing the air filter Open the suction grille. (See the "Removal of Suction Grille".) (S2632) Disengage the hooks of...
Page 243: Removal Of Decoration Panel
FFQ25/35/50/60BV1B Si21-205 Removal of Decoration Panel Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Removing the decoration panel Remove the switch box cover and disconnect the connector of swing motor from the harness connector of electric...
Page 244 Si21-205 FFQ25/35/50/60BV1B Procedure Points Step Turn the provisional hanger to disengage it from the hook of switch box, and slide the decoration panel in the arrow direction to remove the panel. (S2640) (S2641) Removal Procedure...
Page 245: Removal Of Horizontal Vane
FFQ25/35/50/60BV1B Si21-205 Removal of Horizontal Vane Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Removing the decoration panel Refer to the "Removal of Decoration Panel" Remove the padding at Peel not the anti-sweat four corners of frame material but only sealing...
Page 246 Si21-205 FFQ25/35/50/60BV1B Procedure Points Step Remove the horizontal vane. (S2646) Removal Procedure...
Page 247: Removal Of Swing Motor
FFQ25/35/50/60BV1B Si21-205 Removal of Swing Motor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Removing the decoration panel Fixing screw Refer to the "Removal of Decoration Panel" Pull out the swing motor harness from the wiring groove.
Page 248: Removal Of Switch Box
Si21-205 FFQ25/35/50/60BV1B Removal of Switch Box Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Remove decoration panel first. Fixing screw Remove the lid of (M4×12) switch box. (Two pieces of M4 screws) Capacitor...
Page 249: Removal Of Fan Rotor And Fan Motor
FFQ25/35/50/60BV1B Si21-205 Removal of Fan Rotor and Fan Motor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Remove the switch box. Remove the bell mouth (Two screws) A convex protrusion is provided at the position of bell mouth fixing screw to...
Page 250 Si21-205 FFQ25/35/50/60BV1B Procedure Points Step 2. Removing the fan motor Disconnect the harness connector for motor from the motor. Washer faced bolt Remove the three washer faced bolts. (S2656) Pull down the fan motor slowly. (S2657) Removal Procedure...
Page 251: Removal Of Drain Pan
FFQ25/35/50/60BV1B Si21-205 Removal of Drain Pan Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Remove the drain socket to drain water from the drain hole. Remove the 4 mounting screws to remove the drain pan.
Page 252: Removal Of Drain Pump
Si21-205 FFQ25/35/50/60BV1B Removal of Drain Pump Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Removing the drain pump Remove two screws fixing float switch ass'y. (Screw and ) Screw Screw...
Page 253: Installation Of Drain Pump
FFQ25/35/50/60BV1B Si21-205 1.10 Installation of Drain Pump Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Installing the drain pump Put the lead wire in the wiring groove properly, fix the drain pump ass'y with screw...
Page 254 Si21-205 FFQ25/35/50/60BV1B Procedure Points Step Insert the float switch ass'y. At this time, put the lead wires in the wiring groove properly. (S2661) Install the drain pump together with the float switch with screw When install the drain pan, put the lead wires of float switch and drain pump in wiring groove Screw...
Page 255: Replacement Of Heat Exchanger Thermistor
FFQ25/35/50/60BV1B Si21-205 1.11 Replacement of Heat Exchanger Thermistor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Disconnect the grounding terminal from the header. (S2670) Pull apart the thermistor ass'y and motor lead Fan motor lead wire Thermistor ass'y...
Page 256 Si21-205 FFQ25/35/50/60BV1B Procedure Points Step Take out the two tie Heat resistance tie wrap is Anti sweat tube wraps fixing the anti used. Be sure to use a heat sweat tube of header resistance tie wrap when and thermistor. installing new thermistor. ∗Heat resistance tie wrap (Be sure not to take out other tie wrap.)
Page 257: Replacement Of Heat Exchanger
FFQ25/35/50/60BV1B Si21-205 1.12 Replacement of Heat Exchanger Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Removing the heat exchanger Remove the refrigerant This work should be pipe after completion of performed with two refrigerant collection...
Page 258 Si21-205 FFQ25/35/50/60BV1B Procedure Points Step 2. Installing the heat exchanger Groove of ceiling polystyrene foam. Insert the heat exchanger in the groove of ceiling polystyrene foam properly, and bring the tube plate section of heat exchanger into intimate contact with the polystyrene partition plate correctly.
Page 259 FFQ25/35/50/60BV1B Si21-205 Procedure Points Step ∗ Heat resistance tie wrap Reinstall the lead wire of thermistor and anti Parts No.:1278921 Anti sweat tube sweat tube on the (Drg No.:4SA90202-1) original position by using two pieces of heat resistance tie wrap. (S2673) Put the heat exchanger partition plate inside...
Page 260 Si21-205 FFQ25/35/50/60BV1B Procedure Points Step Install the drain pan putting the lead wire of float switch and drain pump into the wire groove securely. When install the drain pan, put the lead wires in wiring groove and pass the lead wires above the black sealing material on the drain pan securely.
Page 261: Replacement Of Pc Board
FFQ25/35/50/60BV1B Si21-205 1.13 Replacement of PC Board Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Procedure Points Step 1. Removing the PC Board Remove the switch box cover. Air temperature thermistor : X19A High tension cable of transformer : X11A (M4 screw×2) Low tension cable of transformer : X10A...
Page 262 Si21-205 FFQ25/35/50/60BV1B Procedure Points Step 2. Installing the PC board and re-wiring inside the Lead wire of swing motor :X36A switch box High roltage cable of transformer :X11A Engage the PC board Low roltage cable of transformer :X10A Outdoor unit connection wire :X27A with two claws shown in Wire of remote controller...
Page 263 FFQ25/35/50/60BV1B Si21-205 Procedure Points Step Re-connect the outdoor Be sure to fix the lead wire to unit connection wire, be connected to the the earth wire and wire connector X10A for low- Power of remote controller as transformer tension cable of transformer they were, and fix them to the switch box with tie securely with tie wrap.
Page 264: Replacement Of Receiver Section Of Wireless Remote Controller
Si21-205 FFQ25/35/50/60BV1B 1.14 Replacement of Receiver Section of Wireless Remote Controller Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Procedure Points Step 1. Removing the receiver Transmission parts box section Remove two screws of the transmission parts...
Page 265 FFQ25/35/50/60BV1B Si21-205 Procedure Points Step 2. Installing the receiver section Pass through the lead wire of the receiver section, and insert the corner cover. (S2700) Put the wire in the wiring groove on the hooking piece securely. Hooking piece (S2701) Install the switch box When install the decoration and the decoration...
Page 266: Fhq35/50/60Buv1B
Si21-205 FHQ35/50/60BUV1B 2. FHQ35/50/60BUV1B Removal of Air Filter and Suction Grille Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Push the 2 tabs and open the suction grilles. Push the air filter installation panel from 2 places in the direction...
Page 267: Removal Of Electrical Parts And Pc Boards
FHQ35/50/60BUV1B Si21-205 Removal of Electrical Parts and PC Boards Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Loosen the 2 screws of the control box cover and remove the control box cover.
Page 268 Si21-205 FHQ35/50/60BUV1B Procedure Points Step Disconnect the connector mounted on the PC board. Remove the PC board installation screw. Slide the PC board to the left away from the tabs on the right, and remove the PC board. Removal Procedure...
Page 269: Removal Of Horizontal Blade
FHQ35/50/60BUV1B Si21-205 Removal of Horizontal Blade Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Gently bend the support plate located at the center of the horizontal blade, and detach the center shaft.
Page 270: Removal Of Fan Rotor And Fan Motor
Si21-205 FHQ35/50/60BUV1B Removal of Fan Rotor and Fan Motor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Push the 2 tabs of the fan housing toward the inside with your fingers, and pull out the fan housing.
Page 271 FHQ35/50/60BUV1B Si21-205 Procedure Points Step Slide the intermediate bearing to the right and remove the fan rotor ass’y. Cut off the tie-wrap of connectors the glass tube cover Connector (1) handles high over the fan motor voltage (220-240 V), so be connector.
Page 272: Removal Of Fan Bearing
Si21-205 FHQ35/50/60BUV1B Removal of Fan Bearing Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Remove the fan rotor according to the procedures for removing the fan rotor and fan motor.
Page 273: Removal Of Bottom Panel And Drain Pan
FHQ35/50/60BUV1B Si21-205 Removal of Bottom Panel and Drain Pan Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Remove the 7 bottom panel installation screws (2 each on the left and right, 3 in the rear), and remove the bottom panel.
Page 274: Removal Of Swing Motor
Si21-205 FHQ35/50/60BUV1B Removal of Swing Motor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Remove the screw from the right side panel. Slide the right side panel toward the front and detach it.
Page 275: Outdoor Unit (25/35 Class)
Outdoor Unit (25/35 class) Si21-205 3. Outdoor Unit (25/35 class) Removal of External Casing Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points The stop valve cover can be removed when the fixed screw is removed.
Page 276 Si21-205 Outdoor Unit (25/35 class) Step Procedure Points Remove the three screws on the left side. Remove the one fixed The left side plate and the screw in the rear of the bellmouth can be removed top plate. Once lift the all at once.
Page 277: Removal Of Bellmouth
Outdoor Unit (25/35 class) Si21-205 Removal of Bellmouth Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points The bellmouth is Remove the bellmouth from attached to the front the front plate after removing plate with two screws the two screws which are set...
Page 278: Removal Of Pcb And Electrical Box
Si21-205 Outdoor Unit (25/35 class) Removal of PCB and Electrical Box Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work . Step Procedure Points 1. Remove the shelter. The shelter has five hooks. Be sure to avoid forgetting to Undo the five hooks restore the shelter and to...
Page 279 Outdoor Unit (25/35 class) Si21-205 Step Procedure Points Remove the four screws fixing the PCB. Disconnect the six wire harness. Disconnect the two There is another reactor connectors of the located on bottom frame. reactor. Fasten clamp materials as before when re-assembling. Removal Procedure...
Page 280 Si21-205 Outdoor Unit (25/35 class) Step Procedure Points Undo the eight hooks The PCB has eight hooks. and the PCB can be disengaged. Disconnect the three wires from the PCB. Removal Procedure...
Page 281 Outdoor Unit (25/35 class) Si21-205 Step Procedure Points The PCB can completely be released. 3. Remove the electrical box. Remove the two screws fixing the electrical box. Removal Procedure...
Page 282 Si21-205 Outdoor Unit (25/35 class) Step Procedure Points Lift and remove the electrical box. 4. Remove the molded interconnect device (MID). Remove the one screw fixing the MID. Removal Procedure...
Page 283 Outdoor Unit (25/35 class) Si21-205 Step Procedure Points Slide the MID upward and release. Removal Procedure...
Page 284: Removal Of Propeller Fan And Fan Motor
Si21-205 Outdoor Unit (25/35 class) Removal of Propeller Fan and Fan Motor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work . Step Procedure Points 1. Disconnect the fan motor Remove the external plates connector S70.
Page 285 Outdoor Unit (25/35 class) Si21-205 Step Procedure Points Remove the fan motor. Removal Procedure...
Page 286: Removal Of Compressor Noise Absorption Pad
Si21-205 Outdoor Unit (25/35 class) Removal of Compressor Noise Absorption Pad Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work . Step Procedure Points 1. Remove the right side plate. Remove the three screws for removing right side...
Page 287 Outdoor Unit (25/35 class) Si21-205 Step Procedure Points Pull out the noise absorption pad for the body. Pull out the top pad of Since the slit prepared for the noise absorption the piping on the noise (a). absorption pad is torn easily, remove the pad carefully.
Page 288: Removal Of Partition Plate And Reactor
Si21-205 Outdoor Unit (25/35 class) Removal of Partition Plate and Reactor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work . Step Procedure Points 1. Remove the partition plate. Remove the two screws fixing the partition plate.
Page 289 Outdoor Unit (25/35 class) Si21-205 Step Procedure Points When restoring the partition plate, fit the hook into the bottom frame. 2. Remove the reactor. The reactor can be released by removing the fixed screw. 3. Remove the reactor assembly. Remove the one screw fixing the reactor assembly to the bottom frame.
Page 290 Si21-205 Outdoor Unit (25/35 class) Step Procedure Points Slide the reactor assembly this side and release. Removal Procedure...
Page 291: Removal Of Four Way Valve And Motor Valve
Outdoor Unit (25/35 class) Si21-205 Removal of Four Way Valve and Motor Valve Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work . Step Procedure Points 1. Remove the parts around the four way valve.
Page 292 Si21-205 Outdoor Unit (25/35 class) Step Procedure Points Remove the motor valve coil. Confirm that the refrigerant is completely Caution empty in the refrigerant Be careful about four-way circuit before starting valve, pipes and so on, which work. were heated up by a gas brazing machine, so as not to Provide a protective get burnt on your hands.
Page 293 Outdoor Unit (25/35 class) Si21-205 Step Procedure Points Heat up the brazing parts and withdraw the pipes connected to the In case that the removal seems four way valve by pliers to be hard; and so on. 1. Remove the piping connection part (brazing part) which is easy to remove and restore.
Page 294: Removal Of Compressor
Si21-205 Outdoor Unit (25/35 class) Removal of Compressor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work . Step Procedure Points 1. Remove the parts around Be careful so as not to burn the compressor.
Page 295 Outdoor Unit (25/35 class) Si21-205 Step Procedure Points The mounting nut for Remove the four way valve the compressor is only and the motor valve also so one piece. as not to be burnt out. Remove the nut by an open-end wrench.
Page 296 Si21-205 Outdoor Unit (25/35 class) Step Procedure Points Confirm that the refrigerant is completely empty in the refrigerant Warning! circuit before starting Since it may happen that work. refrigeration oil in the compressor will catch fire, Be sure to apply prepare wet cloth so as to nitrogen’s replacement extinguish the fire quickly.
Page 297: Outdoor Unit (50/60 Class)
Outdoor Unit (50/60 class) Si21-205 4. Outdoor Unit (50/60 class) Removal of the Panels and Plates Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points 1. Remove the panels and plates.
Page 298 Si21-205 Outdoor Unit (50/60 class) Procedure Points Step The front grille has four claws. Slide the discharge grille upwards and remove it. Loosen the six screws of the front panel. Push the front panel and undo the claw. Lift the clamp plate and remove it.
Page 299 Outdoor Unit (50/60 class) Si21-205 Procedure Points Step Undo the right side Lift the front panel and claw, and then the left remove it while pushing the side claws. right side panel inwards. Remove the front panel. Lift the front panel and undo the left side claws.
Page 300 Si21-205 Outdoor Unit (50/60 class) Procedure Points Step 2. Remove the stop valve cover. Loosen the screw of the stop valve cover. Pull down the stop valve cover to undo the claws and remove it. The stop valve cover has six claws.
Page 301: Removal Of The Fan Motor / Propeller Fan
Outdoor Unit (50/60 class) Si21-205 Removal of the Fan Motor / Propeller Fan Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Remove the top panel and the front panel. Shelter 1.
Page 302 Si21-205 Outdoor Unit (50/60 class) Procedure Points Step 2. Remove the fan motor. Disconnect the connector for fan motor (S70). The illustration shows arrangement of the fan motor lead wire. Removal Procedure...
Page 303 Outdoor Unit (50/60 class) Si21-205 Procedure Points Step Unscrew the washer- fitted nut (M10) of the propeller fan with a spanner. Align mark of the propeller fan with D-cut section of the motor shaft when reassembling. Remove the four screws from the fan motor.
Page 304 Si21-205 Outdoor Unit (50/60 class) Procedure Points Step Pull the fan motor out. Put the lead wire through the back of the motor when reassembling. (so as not to be entangled with the propeller fan) (R2697) Removal Procedure...
Page 305: Removal Of The Pcb / Electrical Box
Outdoor Unit (50/60 class) Si21-205 Removal of the PCB / Electrical Box Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Remove the top panel and the front panel. 1.
Page 306 Si21-205 Outdoor Unit (50/60 class) Procedure Points Step Insert the two claws of the lower part and the one claw of the upper back when Claw reassembling. (R2701) 2. Disconnect harnesses. Loosen the fixing screw Service monitor PCB of the cable way board. LED A (Green) LEDA(Green) A B C...
Page 307 Outdoor Unit (50/60 class) Si21-205 Procedure Points Step Push the claw up to release the cable way board. Open the cable way board. Disconnect the Power supply PCB harnesses from the V3(varistor) HAC1 power supply PCB. HL (black) ···· to the terminal strip HE2 (yellow / green) ····...
Page 308 Si21-205 Outdoor Unit (50/60 class) Procedure Points Step Loosen the screw of the control PCB. Undo the two claws and release the control PCB from the ditch of the front side. Disconnect the harnesses while opening the control PCB. S10: to the terminal strip AC2: to the terminal strip...
Page 309 Outdoor Unit (50/60 class) Si21-205 Procedure Points Step Disconnect the connectors. S31: to the SPM S32: to the SPM S33: to the MID S71: to the MID S91: fin thermistor Control PCB (outdoor unit) S10: to the terminal strip S20: electronic expansion valve S31: to CN14 of the S32: to CN11 of the...
Page 310 Si21-205 Outdoor Unit (50/60 class) Procedure Points Step Disconnect the relaying wire connector for the compressor. Release the clamp by pliers. (R2715) Disconnect the reactor harness. Removal Procedure...
Page 311 Outdoor Unit (50/60 class) Si21-205 Procedure Points Step Pull the clamp and draw the thermistor harness out from the back of the electrical box. Loosen the screw of the electrical box. Removal Procedure...
Page 312 Si21-205 Outdoor Unit (50/60 class) Procedure Points Step Release the clamp of the four way valve harness. (R2720) Lift the electrical box and remove it. Removal Procedure...
Page 313: Removal Of The Reactor
Outdoor Unit (50/60 class) Si21-205 Removal of the Reactor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Remove the electrical box. 1. Remove the partition plate . Release the clamp by pliers.
Page 314 Si21-205 Outdoor Unit (50/60 class) Procedure Points Step Lift the partition plate and remove it. Loosen the screw. Slide the reactor and remove it from the partition plate. Removal Procedure...
Page 315: Removal Of The Sound Blanket
Outdoor Unit (50/60 class) Si21-205 Removal of the Sound Blanket Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Disconnect the harness of each thermistor. Release the discharge Pay attention to the direction pipe thermistor.
Page 316 Si21-205 Outdoor Unit (50/60 class) Procedure Points Step Remove the sound Since the piping ports on the blanket (side-outer). sound blanket (side-outer) are torn easily, remove the blanket carefully. Remove the sound blanket (top-upper). Remove the sound blanket (top-lower). Remove the sound Since the piping ports on the blanket (side-inner).
Page 317: Removal Of The Four Way Valve
Outdoor Unit (50/60 class) Si21-205 Removal of the Four Way Valve Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Loosen the screw of the Provide a protective sheet or four way valve coil.
Page 318: Removal Of The Electronic Expansion Valve
Si21-205 Outdoor Unit (50/60 class) Removal of the Electronic Expansion Valve Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Remove the electronic expansion valve coil. Remove the sheets of putty.
Page 319: Removal Of The Compressor
Outdoor Unit (50/60 class) Si21-205 Removal of the Compressor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work. Step Procedure Points Remove the terminal cover. Disconnect the lead Be careful so as not to burn wires of the the compressor terminals or compressor.
Page 320 Si21-205 Outdoor Unit (50/60 class) Procedure Points Step Unscrew the nut of the compressor. Accumulator Compressor Remove the putty of the accumulator. Before working, Warning make sure that the Ventilate when refrigerant refrigerant is empty leaks during the work. in the circuit. (If refrigerant contacts fire, it Be sure to apply will cause to arise toxic gas.)
Page 321 Outdoor Unit (50/60 class) Si21-205 Removal Procedure...
Page 322: Part 10 Appendix
Si21-205 Part 10 Appendix 1. Piping Diagrams..................312 1.1 Indoor Units ..................312 1.2 Outdoor Units (25/35 class)..............313 1.3 Outdoor Units (50/60 class)..............315 2. Wiring Diagrams..................317 2.1 Indoor Units ..................317 2.2 Outdoor Units (25/35 class)..............319 2.3 Outdoor Units (50/60 class)..............320 Appendix...
Page 323: Piping Diagrams
Piping Diagrams Si21-205 1. Piping Diagrams Indoor Units FFQ 25/35/50/60 BV1B Indoor heat exchanger MODEL FFQ25 · 35BV1B FFQ50 · 60BV1B 12.7 Field piping φ C1220T-O Outdoor unit Field piping φ C1220T-O Indoor unit 4D039335 FHQ 35/50/60 BUV1B Indoor heat exchanger MODEL FHQ35BUV1B FHQ50 ·...
Page 324: Outdoor Units (25/35 Class)
Si21-205 Piping Diagrams Outdoor Units (25/35 class) RKS25BVMB OUTDOOR UNIT OUTDOOR TEMPERETURE HEAT EXCHANGER THERMISTOR 7.9CuT 7.9CuT HEAT EXCHANGER THERMISTOR MOTOR OPERATED VALVE CAPILLARY TUBE 1 7.9CuT 6.4CuT 6.4CuT MUFFLER CAPILLARY TUBE 2 WITH FILTER PROPELLER FAN MUFFLER WITH FILTER MUFFLER WITH FILTER...
Page 325 Piping Diagrams Si21-205 RXS25BVMB OUTDOOR UNIT OUTDOOR TEMPERATURE HEAT EXCHANGER THERMISTOR 7.9CuT 7.9CuT HEAT EXCHANGER THERMISTOR MOTOR OPERATED VALVE CAPILLARY TUBE 1 7.9CuT 6.4CuT 6.4CuT MUFFLER FILTER CAPILLARY TUBE 2 WITH FILTER PROPELLER FAN LIQUID RECEIVER WITH FILTER 9.5CuT MUFFLER WITH FILTER FOUR WAY...
Page 326: Outdoor Units (50/60 Class)
Si21-205 Piping Diagrams Outdoor Units (50/60 class) RKS50BVMA, RKS50BVMB, RS50BVMB OUTDOOR UNIT HEAT EXCHANGER OUTDOOR AIR TEMPERATURE THERMISTOR 7.9CuT 12.7CuT 7.9CuT CAPILLARY TUBE 1 7.9CuT MUFFLER 7.9CuT WITH REFRIGERANT FLOW FILTER 6.4CuT 7.9CuT COOLING HEAT EXCHANGER THERMISTOR CAPILLARY TUBE 2 7.9CuT CAPILLARY TUBE 3 PROPELLER FAN...
Page 327 Piping Diagrams Si21-205 RXS50BVMA, RXS50BVMB OUTDOOR UNIT HEAT EXCHANGER OUTDOOR AIR TEMPERATURE THERMISTOR 7.9CuT 12.7CuT 7.9CuT CAPILLARY TUBE 1 7.9CuT MUFFLER 7.9CuT WITH REFRIGERANT FLOW FILTER 6.4CuT 7.9CuT COOLING HEAT EXCHANGER CAPILLARY TUBE 2 THERMISTOR HEATING 7.9CuT CAPILLARY TUBE 3 PROPELLER FAN 12.7CuT FOUR WAY...
Page 328: Wiring Diagrams
Si21-205 Wiring Diagrams 2. Wiring Diagrams Indoor Units FFQ 25/35/50/60 BV1B : CONNECTER DISCRIMINATION COLOUR FOR COMPONENTS. : CONNECTER COLOUR FOR COMPONENTS. : CONNECTER COLOUR FOR PRINTED CIRCUIT BOARD. t˚ IN CASE OF SIMULTANEOUS t˚ t˚ OPERATION SYSTEM INDOOR UNIT INDOOR UNIT ( MASTER ) ( SLAVE )
Page 329 Wiring Diagrams Si21-205 FHQ 35/50/60 BUV1B : CONNECTER DISCRIMINATION COLOUR FOR COMPONENTS. : CONNECTER COLOUR FOR COMPONENTS. IN CASE OF SIMULTANEOUS t˚ : CONNECTER COLOUR FOR PRINTED CIRCUIT BOARD. OPERATION SYSTEM t˚ t˚ INDOOR UNIT INDOOR UNIT TO OUTDOOR X19A X18A X17A ( MASTER )
Page 330: Outdoor Units (25/35 Class)
Si21-205 Wiring Diagrams Outdoor Units (25/35 class) RKS25BVMB, RKS35BVMB t˚ indoor ( FIN ) PCB1 PCB2 MRM20 TRM1 MRM10 3.15A ˚C FIELD WIRING. NOTE 1. REFER TO THE NAMEPLATE FOR THE POWER REQUIREMENTS. t˚ t˚ t˚ X30A 2. IF THE REFRIGERANT PIPING EXCEEDS 15M, CUT THE LEAD LINE MARKED "J7"...
Page 331: Outdoor Units (50/60 Class)
Wiring Diagrams Si21-205 Outdoor Units (50/60 class) RKS 50/60 BVMA, RKS 50/60 BVMB, RS 50/60 BVMB PCB2 FU201 3.15A MRM20 + + + HAC1 MRM10 X11A CT1 H2 CN11 R12T CN14 3.15A TO INDOOR UNIT t˚ PCB1 S101 POWER SUPPLY ~50Hz 220-240V ~60Hz 220-230V FIELD WIRING...
Page 332: Index
Si21-205 Index Numerics outdoor unit fan system check (with DC motor) ............224 3 minutes stand-by .........91, 107 power supply waveforms check ....225 power transistor check ........226 thermistor resistance check ......222 A1 .................142 turning speed pulse input on the outdoor unit A3 .................143 PCB check ........
Page 333 Si21-205 electronic expansion valve control ....97, 112 four way valve performance check ....188, 221 error codes four way valve switching ....... 91, 107 A1 ..............142 freeze-up protection control ....76, 93, 109 A3 ..............143 frequency control ........... 89, 105 A6 ............146, 147 front panel ............
Page 334 Si21-205 list of mode No..........58 power supply PCB ......... 69, 296 range of air flow direction ........60 power supply waveforms check ....192, 225 wireless remote controller ........61 power transistor check ........ 193, 226 low Hz high pressure limit ........111 preheating operation ........
Page 335 Si21-205 shelter ............267, 290 between indoor unit and remote controller ... 157 sound blanket ............305 between main and sub remote controller ..158 specifications ............8 troubleshooting based on equipment condition SPM ...............70 After shutting down, equipment does not stop valve cover ...........264, 289 restart for a while.
Page 336 Si21-205 Drawings & Flow Charts INSPECTION/TEST button ......... 133 installation condition check ......190 address setting ............62 insufficient gas ..........181 appearance insufficient gas control ......... 100 indoor units ............3 inverter units refrigerant system check ..192 outdoor units ............3 remote controller ..........3 low Hz high pressure limit ........
Page 337 Si21-205 RXS60BVMB ..........316 between main and sub remote controller ..158 position sensor abnormality ......170 troubleshooting based on equipment condition power supply PCB ..........69 after shutting down, equipment power supply waveforms check ....192 does not restart for a while....124 power transistor check ........
Page 338 Daikin Europe N.V. is approved by LRQA for its Quality Daikin units comply with the European regulations that Management System in accordance with the ISO9001 guarantee the safety of the product. standard. ISO9001 pertains to quality assurance regarding design, development, manufacturing as well as to services related to the product.

Daikin Sky Air B-Series R-410A Service Manual

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