Related Manuals for Daikin SM-12-012
Summary of Contents for Daikin SM-12-012
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Page 1: Service Manual
Air Conditioners Service Manual Split Inverter SM-12-012 Service Manual SM-Inverter_(i) -
Page 2: Inverter Single Split
1.0 Introduction Inverter Air conditioning technology is today’s solution for superior comfort, higher efficiency and better energy saving. This Service Manual will intro Daikin Inverter Residential and Light Commercial product. INVERTER Y Series Single Split (Residential, Light Commercial) INDOORS OUTDOORS 1.1 INVERTER SINGLE SPLIT... - Page 3 Disable Auto Random Restart function: Series I Series II To disable the auto random restart function, kindly cut off the jumper J_AUTO as highlighted in attachment. Please be informed that after disable auto random restart, unit is not able to restart with last state memory after power resume from failure.
- Page 4 2.0 Algorithm and Control INDOOR BASIC FUNCTIONS Residential and Light Commercial The system has 5 operating modes. The mode selection is done from indoor using handset. The operating modes are: • Cool • Heat • • Auto • Cool Mode: When Tr ≥...
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Page 5: Fan Mode
Heat Mode: When Ts > Tr - 1.0°C • Comp, ID Fan and OD Fan ON. When Tr ≥ Ts + 1.5°C • Compressor and Outdoor Fan OFF. Indoor Fan off if indoor coil ≤ 20°C. • Tr = Room Temperature Ts = Set Temperature When heating load is too small, and the room temperature still rising above compressor cut off point, compressor will stop. - Page 6 • Heating operation: Tr < Ts ID-OD COMMUNICATION Master by outdoor unit. Indoor controller board will transmit signal to outdoor controller board every 0.5s. Outdoor unit will response to indoor once the valid data is received. If the data communication line between indoor and outdoor disrupted for 15s continuously, compressor will stop, OD fan stop with fan OFF timer.
- Page 7 THERMISTORS IN ARXN/ RXN-LV1B(9) FUNCTIONS OF THERMISTOR Thermistor Functions Used for discharge superheat (SH) & EXV control. Discharge pipe Used for defrost control. Also used for inverter current protection control in Outdoor coil Series II. Used for defrost & outdoor fan speed control. Also used for PMV, overall Outdoor air current protection &...
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Page 8: Auto Restart
MINIMUM RUN CONTROL To prevent frequent compressor ON/OFF & to allow pressure equalization • The compressor will be on 3 minutes stand-by after turning OFF before it is allowed to turn ON. • OD fan OFF delay to improve pressure equalization & to prevent refrigerant from entering into evaporator. -
Page 9: Defrost Control
ATXN/FTXN-LV and ARXN/RXN-LV(1B/1B9): DEFROST CONTROL Condition for entering defrost • Compressor minimum run time – 6 minutes OR • Compressor accumulated run time of 45 minutes if Outdoor coil < 3°C. Condition for terminating defrost • OD coil > 12°C or •... - Page 10 ROTATION REGULATING FUNCTIONS Upper limit rotation Limit Rotation Command Rotation Target Rotation Lower limit rotation Starting Rotation Defrost* * Defrost control for heat pump model only STARTING ROTATION STARTING CONTROL To avoid excessive oil discharge from compressor or to promote oil lubrication during startup. To prevent liquid flood back to the compressor.
- Page 11 COMMAND ROTATION Cut in upon termination of Starting Control. Achieve capacity control by controlling the compressor rotation based on : • Temperature difference between set and room temperature, ∆T. • Limit Rotation. • Defrost control. Fuzzy Control Based on temperature difference, ∆T, current fan speed setting & current indoor operating mode at every 30 seconds interval.
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Page 12: High Pressure Protection
Zone Control Compressor is stopped when a certain limit reaches the stop zone for abnormality Stop correction. Drop Frequency will be dropped with a timer setting. Keep Frequency is maintained at lower/upper limit. Frequency will be increased with a timer setting. Reset Frequency lower/upper limit is canceled and returned to command rotation. -
Page 13: Discharge Pipe Temperature Control
DISCHARGE PIPE TEMPERATURE CONTROL Used as a measure of the compressor’s internal temperature. Compressor frequency is control to keep this temperature from going up further when it rises above a certain level. If compressor discharge temperature >102°C (111°C) for the first time, this control starts and set the current frequency as upper limit. - Page 14 OVERALL CURRENT CONTROL To monitor the overall current and to restrict the compressor upper limit rotation in order to prevent circuit breakers from exceeding the rated capacity. Detected during compressor running. Model ARXN/ RXN25 9.5A ARXN/ RXN35 10.0A ARXN/ RXN50 12.0A ARXN/ RXN60 12.0A...
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Page 15: Service Diagnosis
3.0 Service Diagnosis From indoor units • When any error occurs, indoor LED display will keep blinking – green light: • The blinking pattern not indicate error details • The error details have to retrieve from handset in error code form. LED blinks here Indoor Wireless Handset: BRC52A61/A62 Using wireless handset BRC52A61/A62 to retrieve error code:... - Page 16 3. ID unit buzzer will produce a long beep if the handset error code matched with unit error. 4. A short and two consecutive beeps is Not the unit error. 5. The code display will cancel itself if the button is not pressed for 1 minute. How to Retrieved Last State Error: 1) Remove battery from remote controller.
- Page 17 Using wired handset BRC51A61/A62: The error will show at the LCD display. BRC51A61 can retrieved last state memory by : Press SLEEP & TIMER ACTIVE simultaneously for 5 seconds and the error will be flashed. Service Manual SM-Inverter_(i)
- Page 18 Error code description for Inverter: ERROR CODE ERROR DESCRIPTION RXN50,60 LV1B(9) RXN25,35LV1B(9) √ √ Normal √ √ INDOOR PCB ERROR √ DRAIN PUMP ABNORMAL √ √ ANTIFREEZE PROTECTION √ √ INDOOR FAN MOTOR ABNORMAL √ AIR SWING MOTOR LOCK INDOOR HEAT EXCHANGER √...
- Page 19 √ √ AC CURRENT SENSOR ERROR OUTDOOR AIR THERMISTOR √ √ SHORT/OPEN COMPRESSOR DISCHARGE PIPE THERMISTOR √ √ SHORT/OPEN/MISPLACED OUTDOOR HEAT EXCHANGER √ √ THERMISTOR SHORT/ OPEN ELECTRICAL BOX TEMPERATURE RISE √ ( compressor off ) HEAT SINK OVERHEAT ( compressor √...
- Page 20 Error Code: Description Indoor unit PCB abnormality Supposed Cause 1) Faulty indoor PCB 2) Faulty connector connection at indoor Troubleshooting Description Water Pump Error Supposed Cause 1.) Faulty drain pump or float switch 2.) Improper drain piping work or drain pipe blockage Troubleshooting Service Manual SM-Inverter_(i)
- Page 21 Description Anti-freeze protection or High Pressure Control Supposed Cause 1) Indoor air filter, heat exchanger block due to dust accumulation. 2) Indoor air short circuit. 3) Indoor coil thermistor faulty. 4) Indoor PCB faulty. 5) Fan blower dirty Troubleshooting Refer to next page Service Manual SM-Inverter_(i)
- Page 22 Service Manual SM-Inverter_(i)
- Page 23 Description Fan Motor or Related Abnormality Supposed Cause 1) Indoor fan motor winding short, or the motor lead wire broken 2) Indoor PCB faulty. Troubleshooting Service Manual SM-Inverter_(i)
- Page 24 Description Indoor Coil Thermistor short/ open Supposed Cause 1) Thermistor , connector faulty 2) Indoor PCB faulty Troubleshooting Description Indoor Room Thermistor Short /Open Supposed Cause 1) Thermistor , connector faulty 2) Indoor PCB faulty Troubleshooting Service Manual SM-Inverter_(i)
- Page 25 Description Outdoor PCB error Supposed Cause 1. Micro Controller program run-away due to external factor such as Noise, Momentary voltage drop, Momentary power failure. 2. Damage of EEPROM 3. Faulty outdoor unit PCB Troubleshooting Check the outdoor condition Power on and off again Replace outdoor PCB Error Again? Carry grounding work...
- Page 26 Service Manual SM-Inverter_(i)
- Page 27 Description High Pressure protection Supposed Cause 1) faulty high pressure switch , connector or wire harness 2) Indoor filter, outdoor coil dirty. 3) Outdoor fan not running, unit overcharge, stop valve is closed. Troubleshooting Service Manual SM-Inverter_(i)
- Page 28 Description Low Pressure protection Supposed Cause 1.) faulty high pressure switch , connector or wire harness 2.) Indoor filter, outdoor coil dirty. 3.) Outdoor fan not running, unit overcharge, stop valve is closed. Troubleshooting Service Manual SM-Inverter_(i)
- Page 29 Description Compressor Overload detected through compressor OL Supposed Cause Refrigerant Shortage 4 way valve malfunction Outdoor unit PCB defective Water mixed in the local piping Electronic expansion valve defective Troubleshooting Service Manual SM-Inverter_(i)
- Page 30 Description Compressor lock Supposed Cause The system will be shut down if the error occurs 16 times. Compressor locked Compressor harness disconnect Troubleshooting Turn off the power. Disconnect the harness U, V and W Check with the inverter checker Correct the power supply Normal? Turn off the power and reconnect the harness.
- Page 31 Description DC Fan Lock Supposed Cause -Fan motor breakdown -Harness or connector disconnected between fan motor and PCB or in poor contact Troubleshooting Service Manual SM-Inverter_(i)
- Page 32 Description Input Over Current Detection Supposed Cause -over current due to compressor failure -over current due to defective outdoor unit PCB -over current due to defective power transistor -over current due to short-circuit Troubleshooting Measure the input current Input current flowing Replace the outdoor unit above its stop level? Check outdoor fan motor,...
- Page 33 Description EXV error Supposed Cause EXV faulty EXV connected wrongly Troubleshooting Description 4 way valve error Supposed Cause Thermistor defective Connector in poor contact 4 way valve defective Outdoor PCB defective Insufficient gas Foreign substance mixed in refrigerant Service Manual SM-Inverter_(i)
- Page 34 Troubleshooting 4 way valve coil or harness disconnected / Reconnect loose ? Check the continuity of the 4 way valve coil and harness Disconnect the harness Replace the 4 way from the connector. valve coil Resistance between harness about 3k ? Check the 4 way valve Replace outdoor switching output.
- Page 35 Description Discharge pipe overheat Supposed Cause Refrigerant shortage Four way valve malfunctioning Discharge pipe thermistor defective Outdoor PCB defective Water mixed in the local piping EXV defective Stop Valve defective Troubleshooting Description Heat exchanger overheat Supposed Cause The installation space is not large enough Faulty outdoor unit fan Faulty EXV Faulty defrost thermistor...
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Page 36: Troubleshooting
Troubleshooting Check outdoor installation condition Change outdoor Any abnormal? location. Clean outdoor coil. Check outdoor fan motor Fan motor running Change fan motor smoothly Check outdoor coil *Refer thermistor resistance table thermistor resistance Resistance Change thermistor normal? Check refrigerant level, EXV, stop valve and condenser ambient temperature Refer to the type... - Page 37 Description Compressor sensor system error Supposed Cause -Reactor disconnection -Compressor disconnection -Outdoor unit PCB defective -Compressor defective Troubleshooting Service Manual SM-Inverter_(i)
- Page 38 Description Compressor feedback detection error Supposed Cause Compressor relay cable disconnected Compressor itself defective Outdoor PCB defective Stop valve closed Input voltage out of specification Troubleshooting Check for short circuit Replace the outdoor unit Normal PCB, outdoor unit fan Check the electrolytic capacitor voltage Compressor harness connected as specified? Reconnect as specified...
- Page 39 Description AC current sensor error Supposed Cause Internal wiring broken Outdoor unit PCB defective Troubleshooting Service Manual SM-Inverter_(i)
- Page 40 H9, J3,J5, J6,J7, J8, J9, P4 Description Thermistor or related abnormality H9 : Outdoor air thermistor short/open J3 : Compressor discharge pipe thermisotr short/open J5 : Suction pipe thermistor short/open J6 : Outdoor heat exchanger thermistor short/open J7 : Subcooling heat exchanger thermistor short/open J8: Liquid pipe thermistor short/open J9 : Gas pipe thermistor short/open P4: Heat sink thermistor short/open...
- Page 41 Description Outdoor control box overheat Supposed Cause Fin temperature rise due to defective outdoor unit fan Fin temperature rise due to short circuit Fin thermistor defective Connector in poor contact Outdoor unit PCB defective Troubleshooting Service Manual SM-Inverter_(i)
- Page 42 Description Heat sink overheat Supposed Cause - Fin temperature rise due to short circuit - Fin temperature rise due to defective outdoor unit fan - Fin thermistor defective - Connector in poor contact - Outdoor unit PCB defective - Silicon grease is not applied properly on the hat radiation fin after replacing outdoor unit PCB.
- Page 43 Description IPM error/IGBT error Supposed Cause Over current due to defective power transistor Over current due to wrong internal wiring Over current due to abnormal supply voltage Over current due to defective PCB Error detection due to defective PCB Over- current due to closed stop valve Over current due to compressor failure Over current due to poor installation condition Connection between main board and IPM board is not properly connect...
- Page 44 Description Insufficient gas Supposed Cause Refrigerant shortage Refrigerant leakage Stop valve closed EXV defective Discharge pipe thermistor defect Indoor and outdoor unit coil thermistor not in actual location or defect Service Manual SM-Inverter_(i)
- Page 45 Troubleshooting Service Manual SM-Inverter_(i)
- Page 46 Description DC voltage out of range Supposed Cause Supply voltage not as specified DC voltage detection circuit defective Troubleshooting Check the supply voltage Supply voltage as Correct the specified? power supply Change outdoor Description Communication error (between indoor and outdoor) Supposed Cause Faulty outdoor unit PCB Faulty indoor unit PCB...
- Page 47 Service Manual SM-Inverter_(i)
- Page 48 Description Communication error (outdoor PCB & IPM PCB) Supposed Cause Wrong models interconnected Wrong indoor unit PCB mounted Indoor unit PCB defective Wrong outdoor unit PCB mounted or defective Troubleshooting Check the models number Check the combination of the models Service Manual SM-Inverter_(i)
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Page 49: Wiring Connection
4.0 Wiring Connection ATXN/ FTXN 25/35 LV1B(9) & ARXN/ RXN 25/35 LV1B(9) Service Manual SM-Inverter_(i) - Page 50 ATXN/ FTXN 50/60 LV1B(9) & ARXN/ RXN50/60 LV1B(9) Service Manual SM-Inverter_(i)
- Page 51 Refrigerant Diagram: ATXN/ FTXN 25/35/50/60 LV1B(9) Service Manual SM-Inverter_(i)
- Page 52 ARXN/ RXN 25/35/50/60 LV1B(9) Appendix: Resistance value when 25°C : Service Manual SM-Inverter_(i)
- Page 53 ARXN/ RXN50/60 ARXN/ RXN 25/35 LV1B(9) LV1B(9) Indoor Wall Mounted Ceiling Concealed, ------ Ceiling Cassette, Ceiling Mounted Outdoor Table 1: Resistance R25 = 10K ohm Table 2: Resistance R25 = 20K ohm Service Manual SM-Inverter_(i)
- Page 54 Temperature ( ° ° ° ° C) Resistance value (k Ω Ω Ω Ω ) 211.0 150.0 116.5 88.0 67.2 51.9 40.0 31.8 25.0 20.0 16.0 13.0 10.6 Service Manual SM-Inverter_(i)