SERVICE MANUAL MUZ-FE09NA MUZ-FE12NA MUZ-FE18NA OUTDOOR UNIT. No. OBH543 REVISED EDITION-A. Models HFC

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1 SPLIT-TYPE AIR CONDITIONERS Revision A: MUZ-FE18NA has been added. Please void OBH543. OUTDOOR UNIT SERVICE MANUAL HFC utilized R410A. OBH543 REVISED EDITION-A Models MUZ-FE09NA MUZ-FE12NA MUZ-FE18NA Indoor unit service manual MSZ-FE NA Series (OBH542) CONTENTS MUZ-FE09NA MUZ-FE12NA 1. TECHNICAL CHANGES 2 2. PART NAMES AND FUNCTIONS 2 3. SPECIFICATION 3 4. OUTLINES AND DIMENSIONS 5 5. WIRING DIAGRAM 6 6. REFRIGERANT SYSTEM DIAGRAM 7 7. DATA 9 8. ACTUATOR CONTROL SERVICE FUNCTIONS TROUBLESHOOTING DISASSEMBLY INSTRUCTIONS 36 PARTS CATALOG (OBB543) TM NOTE: RoHS compliant products have <G> mark on the spec name plate.

2 Revision A: MUZ-FE18NA has been added. 1 TECHNICAL CHANGES MUZ-FE09NA MUZ-FE12NA MUZ-FE18NA 1. New model 2 PART NAMES AND FUNCTIONS MUZ-FE09NA MUZ-FE12NA Air inlet (back and side) Piping Drain hose Air outlet Drain outlet MUZ-FE18NA Air inlet (back and side) Piping Drain hose Air outlet Drain outlet 2

3 3 SPECIFICATION Outdoor unit model MUZ-FE09NA MUZ-FE12NA MUZ-FE18NA Cooling 1 Btu/h 9,000 (2,800~9,000) 12,000 (2,800~12,000) 18,000 (8,200~25,200) Heating 47 1 Btu/h 10,900 (3,000~18,000) 13,600 (3,000~21,000) 21,600 (7,500~29,700) Capacity Rated Heating 17 2 Btu/h 12,500 13,600 19,300 Capacity Rated (Minimum~Maximum) Power consumption Rated (Minimum~Maximum) Cooling 1 W 580 (160~650) 930 (160~960) 1,270 (570~2,280) Heating 47 1 W 710 (150~2,250) 950 (150~2,250) 1,540 (520~2,420) Power consumption Rated Heating 17 2 W 1,730 1,780 2,180 EER 1 [SEER] 3 Cooling 15.5 [26.0] 12.9 [23.0] 14.2 [20.2] HSPF IV 4 Heating COP Heating Power supply V, phase, Hz 208/230, 1, 60 Max. fuse size (time delay) A Min. circuit ampacity A Fan motor F.L.A Model SNB130FQAH SNB172FQKMT Compressor R.L.A L.R.A Refrigeration oil L (Model) 0.45 (NEO22) 0.40 (FV50S) Refrigerant control Linear expansion valve Sound level 1 Cooling db(a) Heating db(a) Defrost method Reverse cycle W in. 31-1/2 33-1/16 Dimensions D in. 11-1/4 13 H in. 21-5/8 34-5/8 Weight Ib External fi nish Munsell 3Y 7.8/1.1 Remote controller Wireless type Control voltage (by built-in transformer) VDC Refrigerant piping t supplied Refrigerant pipe size Liquid in. 1/4 (0.0315) 3/8 (0.0315) (Min. wall thickness) Gas in. 3/8 (0.0315) 5/8 (0.0315) Connection method Indoor Flared Flared Outdoor Flared Flared Between the indoor Height difference ft & outdoor units Piping length ft Refrigerant charge (R410A) 2 lb. 9 oz. 4 lb. 3 oz. NOTE: Test conditions are based on AHRI 210/240. 1: Rating conditions (Cooling) Indoor: 80 FDB, 67 FWB, Outdoor: 95 FDB, (75 FWB) Rated frequency (Heating) Indoor: 70 FDB, 60 FWB, Outdoor: 47 FDB, 43 FWB Rated frequency 2: (Heating) Indoor: 70 FDB, 60 FWB, Outdoor: 17 FDB, 15 FWB Maximum frequency 3

4 Test condition 3, 4 ARI Mode Test SEER (Cooling) HSPF (Heating) "A-2" Cooling Steady State at rated compressor Speed "B-2" Cooling Steady State at rated compressor Speed "B-1" Cooling Steady State at minimum compressor Speed "F-1" Cooling Steady State at minimum compressor Speed "E-V" Cooling Steady State at Intermediate compressor Speed 5 "H1-2" Heating Steady State at rated compressor Speed "H3-2" Heating at rated compressor Speed "H0-1" Heating Steady State at minimum compressor Speed "H1-1" Heating Steady State at minimum compressor Speed "H2-V" Heating at Intermediate compressor Speed 5 Indoor air condition ( F) Outdoor air condition ( F) Dry bulb Wet bulb Dry bulb Wet bulb (75) (65) (65) (53.5) (69) : At Intermediate compressor Speed = ("Cooling rated compressor speed" - "minimum compressor speed") / 3 + "minimum compressor speed". OPERATING RANGE (1) POWER SUPPLY Rated voltage Guaranteed voltage (V) Outdoor unit 208/230 V 1 phase 60 Hz Min Max. 253 (2) OPERATION Intake air temperature ( F) Mode Condition Indoor Outdoor DB WB DB WB Standard temperature Cooling Maximum temperature Minimum temperature Maximum humidity 78 % Standard temperature Heating Maximum temperature Minimum temperature

5 4 OUTLINES AND DIMENSIONS MUZ-FE09NA MUZ-FE12NA 1-3/4 Air in 15-3/4 Drain hole 1-5/8 Air in 11/16 12 ~ 12-3/4 13-9/16 REQUIRED SPACE 4 in. or more Unit: inch Basically open 4 inch or more without any obstruction in front and on both sides of the unit. 4 in. or more 7/8 Air out 1-9/16 2-3/8 13/16 Oval hole 29/ /4 8 in. or more 14 in. or more handle Open two sides of left, right, or rear side. 11-1/ /8 21-5/8 Liquid pipe Gas pipe :1/4 (flared) :3/8 (flared) 13/ / / / /2 2-23/ /32 MUZ-FE18NA REQUIRED SPACE 20 in. or more 16-7/16 Air in Drain hole 1-9/16 1-5/8 4 in. or more 4 in. or more /16 Air out 6-7/ /16 2-holes 13/32 13/16 20 in. or more 14 in. or more 33-1/16 4-5/16 3-3/16 Service panel 34-5/8 Liquid refrigerant pipe joint Refrigerant pipe (flared) Ø 3/ / /2 3-29/ /16 Gas refrigerant pipe joint Refrigerant pipe (flared) Ø 5/8 5

6 5 WIRING DIAGRAM MUZ-FE09NA MUZ-FE12NA MUZ-FE18NA 6

7 6 REFRIGERANT SYSTEM DIAGRAM MUZ-FE09NA MUZ-FE12NA Refrigerant pipe ø3/8 (with heat insulator) Flared connection Flared connection Refrigerant pipe ø1/4 (with heat insulator) Muffler Stop valve (with service port) Stop valve (with strainer) 4-way valve Discharge temperature thermistor RT62 Service port Muffler Service port Compressor Defrost thermistor RT61 Capillary tube O.D I.D /8 (ø3.0 ø ) Expansion valve Capillary tube O.D I.D /16 (ø3.0 ø ) Outdoor heat exchanger Strainer #100 Outdoor heat exchanger temperature thermistor RT68 Ambient temperature thermistor RT65 R.V. coil heating ON cooling OFF Refrigerant flow in cooling Refrigerant flow in heating Unit: inch MUZ-FE18NA Refrigerant pipe ø5/8 (with heat insulator) 4-way valve Muffler #100 Service port Flared connection Stop valve (with service port) Service port Discharge temperature thermistor RT62 Defrost thermistor RT61 Outdoor heat exchanger Ambient temperature thermistor RT65 Flared connection Refrigerant pipe ø3/8 (with heat insulator) Stop valve Strainer #100 Compressor LEV Strainer #100 Capillary tube O.D I.D /16 (ø4.0 ø ) Outdoor heat exchanger temperature thermistor RT68 R.V. coil heating ON cooling OFF Refrigerant flow in cooling Refrigerant flow in heating 7

8 MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE Model Max. Length A Refrigerant piping: ft. Max. Height difference B Piping size O.D: in. MUZ-FE09NA MUZ-FE12NA /8 1/4 MUZ-FE18NA /8 3/8 Gas Liquid Indoor unit Max. Height difference B Max. Length A Outdoor unit ADDITIONAL REFRIGERANT CHARGE (R410A: oz.) NOTE: Refrigerant piping exceeding 25 ft. requires additional refrigerant charge according to the calculation. Model MUZ-FE09NA MUZ-FE12NA Outdoor unit precharged Refrigerant piping length (one way): ft lb. 9 oz Calculation: X oz. = 1.08/5 oz. / ft. (Refrigerant piping length (ft.) - 25) NOTE: Refrigerant piping exceeding 33 ft. requires additional refrigerant charge according to the calculation. Model Outdoor unit precharged Refrigerant piping length (one way): ft MUZ-FE18NA 4 lb. 3 oz Calculation: X oz. = 2.96/5 oz. / ft. (Refrigerant piping length (ft.) - 33) 8

9 7 DATA MUZ-FE09NA MUZ-FE12NA MUZ-FE18NA 7-1. PERFORMANCE DATA 1) COOLING CAPACITY Indoor air Outdoor intake air DB temperature ( F) Model IWB ( F) TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC MUZ-FE09NA MUZ-FE12NA MUZ-FE18NA NOTE: 1. IWB : Intake air wet-bulb temperature TC : Total Capacity (x10 3 Btu/h) SHC : Sensible Heat Capacity (x10 3 Btu/h) TPC : Total Power Consumption (kw) 2. SHC is based on 80 F of indoor Intake air DB temperature. 2) COOLING CAPACITY CORRECTIONS Refrigerant piping length (one way: ft.) 25 (std.) MUZ-FE09NA MUZ-FE12NA MUZ-FE18NA ) HEATING CAPACITY Indoor air Outdoor intake air WB temperature ( F) Model IDB ( F) TC TPC TC TPC TC TPC TC TPC TC TPC TC TPC TC TPC MUZ-FE09NA MUZ-FE12NA MUZ-FE18NA NOTE: 1. IDB : Intake air dry-bulb temperature TC : Total Capacity (x10 3 Btu/h) TPC : Total Power Consumption (kw) 2. Above data is for heating operation without any frost. How to operate with fixed operational frequency of the compressor. 1. Press the EMERGENCY OPERATION switch on the front of the indoor unit, and select either EMERGENCY COOL mode or EMERGENCY HEAT mode before starting to operate the air conditioner. 2. The compressor starts with operational frequency. 3. The fan speed of the indoor unit is High. 4. This operation continues for 30 minutes. 5. In order to release this operation, press the EMERGENCY OPERATION switch twice or once, or press any button on the remote controller. 9

10 7-2. PERFORMANCE CURVE Cooling Indoor air Wet-bulb temperature difference ( F) Total power consumption (kw) Capacity correction factors MUZ-FE09NA Cooling capacity (at Rated frequency) SHF at rating condition = 0.76 Airflow = 307 CFM Indoor intake air WB temperature ( F) Outdoor intake air DB temperature ( F) Indoor intake air Wet-bulb temperature( F) Outdoor intake air Dry-bulb temperature( F) MUZ-FE12NA Total power consumption (kw) SHF at rating condition = 0.73 Airflow = 350 CFM Indoor intake air WB temperature ( F) Outdoor intake air DB temperature ( F) MUZ-FE18NA Total power consumption (kw) SHF at rating condition = 0.84 Airflow = 634 CFM Indoor intake air WB temperature ( F) Outdoor intake air DB temperature ( F) This value of frequency is not the same as the actual frequency in operating. Refer to 7-5 and 7-6 for the relationships between frequency and capacity. 10

11 Heating Indoor air Dry-bulb temperature difference ( F) Capacity correction factor Heating capacity (at Rated frequency) Indoor intake air Dry-bulb temperature ( F) Outdoor intake air Wet-bulb temperature ( F) MUZ-FE09NA Total power consumption (kw) Indoor intake air DB temperature ( F) Airflow = 381 CFM Outdoor intake air WB temperature ( F) MUZ-FE12NA Total power consumption (kw) Airflow = 420 CFM Indoor intake air DB temperature ( F) Outdoor intake air WB temperature ( F) MUZ-FE18NA Total power consumption (kw) Indoor intake air DB temperature ( F) Airflow = 738 CFM Outdoor intake air WB temperature ( F) This value of frequency is not the same as the actual frequency in operating. Refer to 7-5 and 7-6 for the relationships between frequency and capacity. 11

12 7-3. CONDENSING PRESSURE Cooling Data is based on the condition of indoor humidity 50 %. Air flow should be set to High speed. MUZ-FE09NA (PSIG) 580 Condensing pressure Indoor DB temperature ( F) ( F) Outdoor ambient temperature (PSIG) ( F) Outdoor ambient temperature Suction pressure Indoor DB temperature ( F) MUZ-FE12NA (PSIG) 580 Condensing pressure Indoor DB temperature ( F) ( F) Outdoor ambient temperature (PSIG) ( F) Outdoor ambient temperature Suction pressure Indoor DB temperature ( F) MUZ-FE18NA Condensing pressure (PSIG) Indoor DB temperature ( F) ( F) Outdoor ambient temperature Suction pressure (PSIG) Indoor DB temperature ( F) ( F) Outdoor ambient temperature 12

13 Heating Data is based on the condition of outdoor humidity 75%. Air flow should be set to High speed. Data is for heating operation without any frost. MUZ-FE09NA (PSIG) (PSIG) Hz Hz ( F) ( F) Condensing pressure Indoor DB temperature ( F) Outdoor ambient temperature Suction pressure Indoor DB temperature ( F) Outdoor ambient temperature MUZ-FE12NA (PSIG) 400 Condensing pressure Indoor DB temperature ( F) Outdoor ambient temperature 58Hz (PSIG) ( F) Suction pressure Indoor DB temperature ( F) Outdoor ambient temperature 58Hz ( F) MUZ-FE18NA (PSIG) 480 Condensing pressure Indoor DB temperature ( F) 58Hz ( F) Outdoor ambient temperature (PSIG) 240 Suction pressure Indoor DB temperature ( F) 58Hz ( F) Outdoor ambient temperature 13

14 7-4. STANDARD OPERATION DATA Total Electrical circuit Refrigerant circuit Indoor unit Outdoor unit Model MSZ-FE09NA MSZ-FE12NA MSZ-FE18NA Item Unit Cooling Heating Cooling Heating Cooling Heating Capacity Btu/h 9,000 10,900 12,000 13,600 18,000 21,600 SHF Input kw Rated frequency Hz Indoor unit MSZ-FE09NA MSZ-FE12NA MSZ-FE18NA V, Power supply phase, 208/230, 1, 60 Hz Input kw Fan motor current A 0.19/ / / / /0.51 Outdoor unit MUZ-FE09NA MUZ-FE12NA MUZ-FE18NA V, Power supply phase, 208/230, 1, 60 Hz Input kw Comp. current A 2.38/ / / / / /5.17 Fan motor current A 0.35/ / /1.02 Condensing pressure PSIG Suction pressure PSIG Discharge temperature F Condensing temperature F Suction temperature F Comp. shell bottom temperature F Ref. pipe length ft. 25 Refrigerant charge (R410A) 2 lb. 9 oz. 4 lb 3 oz. Intake air temperature DB F WB F Discharge air temperature DB F WB F Fan speed (High) rpm 1,020 1,120 1,120 1,220 1,300 Airfl ow (High) CFM 307 (Wet) (Wet) (Wet) 738 Intake air temperature DB F WB F Fan speed rpm Airfl ow CFM 1,102 1,187 1,102 1,187 1,769 1,701 14

15 7-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY MUZ-FE09NA Correction of Cooling capacity Correction of Cooling total input Correction of Heating capacity Correction of Heating total input Capacity correction factors Input correction factors Capacity correction factors Input correction factors (Hz) (Hz) (Hz) (Hz) The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor MUZ-FE12NA 1.5 Correction of Cooling capacity Correction of Cooling total input Correction of Heating capacity Correction of Heating total input 2.5 Capacity correction factors Input correction factors Capacity correction factors Input correction factors (Hz) (Hz) (Hz) (Hz) The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor MUZ-FE18NA 1.5 Correction of Cooling capacity Correction of Cooling total input Correction of Heating capacity 2.0 Correction of Heating total input Capacity correction factors Input correction factors Capacity correction factors Input correction factors (Hz) (Hz) (Hz) The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor (Hz) The operational frequency of compressor 7-6. HOW TO OPERATE FIXED-FREQUENCY OPERATION (Test run operation) 1. Press EMERGENCY OPERATION switch to start COOL or HEAT mode (COOL: Press once, HEAT: Press twice). 2. Test run operation starts and continues to operate for 30 minutes. 3. Compressor operates at rated frequency in COOL mode or 58 Hz in HEAT mode. 4. Indoor fan operates at High speed. 5. After 30 minutes, test run operation finishes and EMERGENCY OPERATION starts (operation frequency of compressor varies). 6. To cancel test run operation (EMERGENCY OPERATION), press EMERGENCY OPERATION switch or any button on remote controller. 15

16 8 ACTUATOR CONTROL MUZ-FE09NA MUZ-FE12NA MUZ-FE18NA 8-1. OUTDOOR FAN MOTOR CONTROL The fan motor turns ON/OFF, interlocking with the compressor. [ON] The fan motor turns ON 5 seconds before the compressor starts up. [OFF] The fan motor turns OFF 15 seconds after the compressor has stopped running. Compressor ON OFF 5 seconds 15 seconds Outdoor fan motor ON OFF 8-2. R.V. COIL CONTROL Heating ON Cooling OFF Dry OFF NOTE: The 4-way valve reverses for 5 seconds right before start-up of the compressor. <COOL> <HEAT> 5 seconds 5 seconds ON Compressor OFF R.V.coil ON OFF Outdoor fan ON motor OFF 8-3. RELATION BETWEEN MAIN SENSOR AND ACTUATOR Sensor Purpose Compressor LEV Actuator Outdoor fan motor R.V. coil Indoor fan motor Discharge temperature thermistor Protection Cooling: Coil frost prevention Indoor coil temperature thermistor Heating: High pressure protection Cooling: High pressure protection Defrost thermistor Heating: Defrosting Fin temperature thermistor Protection Outdoor heat exchanger temperature thermistor High pressure protection Ambient temperature thermistor Low ambient temperature operation 16

17 9 SERVICE FUNCTIONS MUZ-FE09NA MUZ-FE12NA MUZ-FE18NA 9-1. CHANGE IN DEFROST SETTING Changing defrost finish temperature <JS> To change the defrost finish temperature, cut/solder the JS wire of the outdoor inverter P.C. board (Refer to ). JS Jumper Soldered (Initial setting) ne (Cut) Defrost finish temperature MUZ-FE09/12NA MUZ-FE18NA 41 F (5 C) 50 F (10 C) 50 F (10 C) 64 F (18 C) 9-2. PRE-HEAT CONTROL SETTING PRE-HEAT CONTROL When moisture gets into the refrigerant cycle, it may interfere the start-up of the compressor at low outside temperature. The pre-heat control prevents this interference. The pre-heat control turns ON when outside temperature is 68 F (20 C) or below. When pre-heat control is turned ON, compressor is energized. (About 50 W) <JK> To activate the pre-heat control, cut the JK wire of the inverter P.C. board (Refer to ). NOTE: When the inverter P.C. board is replaced, check the Jumper wires, and cut/solder them if necessary. 10 TROUBLESHOOTING MUZ-FE09NA MUZ-FE12NA MUZ-FE18NA CAUTIONS ON TROUBLESHOOTING 1. Before troubleshooting, check the following 1) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for miswiring. 2. Take care of the following during servicing 1) Before servicing the air conditioner, be sure to turn OFF the main unit first with the remote controller, then after confirming the horizontal vane is closed, turn off the breaker and/or disconnect the power plug. 2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the electronic control P.C. board. 3) When removing the electrical parts, be careful of the residual voltage of smoothing capacitor. 4) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the components. 5) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires. <Incorrect> <Correct> Lead wiring Housing point 3. Troubleshooting procedure 1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality. To make sure, check how many times the abnormality indication is flashing on and off before starting service work. 2) Before servicing, check that the connector and terminal are connected properly. 3) When the electronic control P.C. board seems to be defective, check the copper foil pattern for disconnection and the components for bursting and discoloration. 4) Refer to 10-2 and

18 10-2. FAILURE MODE RECALL FUNCTION Outline of the function This air conditioner can memorize the abnormal condition which has occurred once. Even though LED indication listed on the troubleshooting check table (10-3.) disappears, the memorized failure details can be recalled. MSZ-FE09NA MSZ-FE18NA 1. Flow chart of failure mode recall function for the indoor/outdoor unit MSZ-FE12NA Operational procedure The cause of abnormality cannot be found because the abnormality does not recur. Setting up the failure mode recall function Turn ON the power supply. <Preparation of the remote controller> While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time, press RESET button. First, release RESET button. And release the other two buttons after all LCD in operation display section of the remote controller is displayed after 3 seconds. Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit. 1 Does POWER lamp (MSZ-FE09/12NA)/the upper lamp of OPERATION INDICATOR lamp (MSZ-FE18NA) on the indoor unit blink at the interval of 0.5 seconds? Blinks: Either indoor or outdoor unit is abnormal. Beep is emitted at the same timing as the blinking of POWER lamp (MSZ-FE09/12NA)/the upper lamp of OPERATION INDICATOR lamp (MSZ- FE18NA). 2 Judgment of indoor/outdoor abnormality (Blinks) Before blinking, does POWER lamp (MSZ-FE09/12NA)/the upper lamp of OPERATION INDICATOR lamp (MSZ-FE18NA) stay ON for 3 seconds? Stays ON for 3 seconds (without beep): The outdoor unit is abnormal. (OFF) Indoor unit is normal. But the outdoor unit might be abnormal because there are some abnormalities that can not be recalled with this way. Confi rm if outdoor unit is abnormal according to the detailed outdoor unit failure mode recall function. (Refer to ) 1. Regardless of normal or abnormal condition, a short beep is emitted once the signal is received. The indoor unit is abnormal. Check the blinking pattern, and confi rm the abnormal point with the indoor unit failure mode table. (Refer to indoor unit service manual.) Make sure to check at least two consecutive blinking cycles. 2 The outdoor unit is abnormal. Check the blinking pattern, and confi rm the abnormal point with the outdoor unit failure mode table. (Refer to ) Make sure to check at least two consecutive blinking cycles. 3 Releasing the failure mode recall function Release the failure mode recall function by the following procedures. Turn OFF the power supply and turn it ON again. Press RESET button of the remote controller. Repair the defective parts. Deleting the memorized abnormal condition After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall function" mentioned above. Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit. Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted. Release the failure mode recall function according to "Releasing the failure mode recall function" mentioned above. NOTE: 1. Make sure to release the failure mode recall function once it is set up, otherwise the unit cannot operate properly. 2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized. 2. Blinking pattern when the indoor unit is abnormal: 2.5-second OFF Blinking at 0.5- second interval 2.5-second OFF Blinking at 0.5- second interval ON OFF Beeps Repeated cycle Beeps Repeated cycle Beeps Repeated cycle 3.Blinking pattern when the outdoor unit is abnormal: Blinking at second OFF 3-second ON second interval 2.5-second OFF 3-second ON Blinking at 0.5- second interval ON OFF beep Repeated cycle Beeps beep Repeated cycle Beeps Repeated cycle 18

19 2. Flow chart of the detailed outdoor unit failure mode recall function Operational procedure The outdoor unit might be abnormal. Confi rm if outdoor unit is abnormal according to the following procedures. Confi rm that the remote controller is in the failure mode recall function. With the remote controller headed towards the indoor unit, press TOO COOL or TOO WARM button to adjust the set temperature to 77 F (25 C) Regardless of normal or abnormal condition, 2 short beeps are emitted as the signal is received. Does POWER lamp(msz-fe09/12na)/the upper lamp of OPERATION INDICATOR lamp(msz- FE18NA) on the indoor unit blink at the interval of 0.5 seconds? Blinks: The outdoor unit is abnormal. Beep is emitted at the same timing as the blinking of POWER lamp (MSZ-FE09/12NA)/the upper lamp of OPERATION INDICATOR lamp (MSZ-FE- 18NA). 2 (Blinks) (OFF) The outdoor unit is abnormal. Check the blinking pattern, and confi rm the abnormal point with the outdoor unit failure mode table ( ). Make sure to check at least two consecutive blinking cycles. 2 The outdoor unit is normal. Releasing the failure mode recall function Release the failure mode recall function by the following procedures. Turn OFF the power supply and turn it ON again. Press RESET button of the remote controller. Release the failure mode recall function according to the left mentioned procedure. Repair the defective parts. Deleting the memorized abnormal condition After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall function" ( ). Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit. Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted. Release the failure mode recall function according to "Releasing the failure mode recall function" mentioned above. NOTE: 1. Make sure to release the failure mode recall function once it is set up, otherwise the unit cannot operate properly. 2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized. 2.Blinking pattern when outdoor unit is abnormal: 2.5-second OFF 3-second ON Blinking at 0.5- second interval 2.5-second OFF 3-second ON Blinking at 0.5- second interval ON OFF beep Repeated cycle Beeps beep Repeated cycle Beeps Repeated cycle 19

20 3. Outdoor unit failure mode table OPERATION INDICATOR POWER lamp Upper lamp (Indoor unit) Abnormal point (Failure mode/protection) LED indication (Outdoor P.C. board) 20 Condition Remedy Indoor/ outdoor unit failure mode recall function Outdoor unit failure mode recall function OFF ne (rmal) 2-time fl ash 2.5 seconds OFF 3-time fl ash 2.5 seconds OFF 4-time fl ash 2.5 seconds OFF 5-time fl ash 2.5 seconds OFF 6-time fl ash 2.5 seconds OFF 7-time fl ash 2.5 seconds OFF 8-time fl ash 2.5 seconds OFF 9-time fl ash 2.5 seconds OFF 10-time fl ash 2.5 seconds OFF 11-time fl ash 2.5 seconds OFF 12-time fl ash 2.5 seconds OFF 14-time fl ash 2.5 seconds OFF Outdoor power system Discharge temperature thermistor Defrost thermistor Fin temperature thermistor P.C. board temperature thermistor Ambient temperature thermistor Overcurrent 1-time fl ash every 2.5 seconds 3-time fl ash 4-time fl ash 2-time fl ash 11-time fl ash Compressor synchronous 12-time fl ash abnormality (Compressor startup failure protection) Discharge temperature High pressure Fin temperature/ P.C. board temperature Outdoor fan motor nvolatile memory data MUZ-FE18NA Power module Discharge temperature DC voltage Each phase current of compressor 7-time fl ash 5-time fl ash 6-time fl ash 8-time fl ash 9-time fl ash Overcurrent Compressor openphase 2.5 seconds 10-time fl ash OFF Stop valve (Closed valve) 14-time fl ash Overcurrent protection stop is continuously performed 3 times within 1 minute after the compressor gets started. Thermistor shorts or opens during compressor running. Large current fl ows into intelligent power module. Waveform of compressor current is distorted. Temperature of discharge temperature thermistor exceeds 241 F (116 C), compressor stops. Compressor can restart if discharge temperature thermistor reads 212 F (100 C) or less 3 minutes later. Temperature of indoor coil thermistor exceeds 158 F (70 C) in HEAT mode. Temperature of defrost thermistor exceeds 158 F (70 C) in COOL mode. Temperature of fi n temperature thermistor on the inverter P.C. board exceeds 167 ~ 176 F (75 ~ 80 C), or temperature of P.C. board temperature thermistor on the inverter P.C. board exceeds 158 ~ 167 F (70 ~ 75 C). Outdoor fan has stopped 3 times in a row within 30 seconds after outdoor fan start-up. nvolatile memory data cannot be read properly. The interphase short circuit occurs in the output of the intelligent power module (IPM). The compressor winding shorts circuit. Temperature of discharge temperature thermistor has been 122 F (50 C) or less for 20 minutes. DC voltage of inverter cannot be detected normally. Each phase current of compressor cannot be detected normally. Large current fl ows into intelligent power module (IPM). The open-phase operation of compressor is detected. The interphase short circuit occurs in the output of the intelligent power module (IPM). The compressor winding shorts circuit. Closed valve is detected by compressor current. Reconnect connectors. Refer to "How to check inverter/ compressor". Check stop valve. Refer to "Check of outdoor thermistors". Defective outdoor thermistors can be identifi ed by checking the blinking pattern of LED. Reconnect compressor connector. Refer to "How to check inverter/ compressor". Check stop valve. Reconnect compressor connector. Refer to "How to check inverter/ compressor". Check refrigerant circuit and refrigerant amount. Refer to "Check of LEV". Check refrigerant circuit and refrigerant amount. Check stop valve. Check around outdoor unit. Check outdoor unit air passage. Refer to "Check of outdoor fan motor". Refer to "Check of outdoor fan motor". Refer to "Check of inverter P.C. board". Replace the inverter P.C. board. Refer to "How to check inverter/ compressor". Refer to "Check of LEV". Check refrigerant circuit and refrigerant amount. Refer to "How to check inverter/ compressor". Reconnect compressor connector. Refer to "How to check inverter/ compressor". Check stop valve NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (10-3.). OPERATION INDICATOR POWER lamp: MSZ-FE09/12NA Upper lamp: MSZ-FE18NA

21 10-3. TROUBLESHOOTING CHECK TABLE. Symptom LED indication Outdoor unit 1-time fl ash every does not operate. 2.5 seconds 6-time fl ash 11-time fl ash 14-time fl ash 'Outdoor unit 2-time fl ash stops and restarts 3 minutes later' is repeated. 3-time fl ash Outdoor unit operates. 4-time fl ash 5-time fl ash 8-time fl ash 10-time fl ash 12-time fl ash 13-time fl ash 1-time fl ash 3-time fl ash 4-time fl ash Abnormal point/ Condition Outdoor power system Condition Overcurrent protection stop is continuously performed 3 times within 1 minute after the compressor gets started, or failure of restart of compressor has repeated 24 times. Outdoor thermistors Discharge temperature thermistor, fi n temperature thermistor, defrost thermistor, outdoor heat exchanger temperature thermistor, P.C. board temperature thermistor or ambient temperature thermistor shorts or opens during compressor running. Outdoor control system Serial signal Stop valve/ Closed valve Outdoor unit (Other abnormality) Overcurrent protection nvolatile memory data cannot be read properly. [POWER lamp (MSZ-FE09/12NA)/the upper lamp of OPERA- TION INDICATOR lamp (MSZ-FE18NA) of the indoor unit lights up or fl ashes 7 times.] The communication fails between the indoor and outdoor unit for 3 minutes. Closed valve is detected by compressor current. Outdoor unit is defective. Large current fl ows into intelligent power module. MUZ-FE09/12NA When overcurrent protection occurs within 10 seconds after compressor starts, compressor restarts after 15 seconds. Discharge temperature overheat protec- F (116 C), compressor stops. Compressor can restart if dis- Temperature of discharge temperature thermistor exceeds 241 tion charge temperature thermistor reads 212 F (100 C) or less 3 minutes later. Fin temperature /P.C. board temperature thermistor overheat protection High pressure protection Compressor synchronous abnormality Outdoor fan motor Each phase current of compressor Temperature of fi n temperature thermistor on the heat sink exceeds 167 ~ 176 F (75 ~ 80 C) or temperature of P.C. board temperature thermistor on the inverter P.C. board exceeds 158 ~ 167 F (70 ~ 75 C). Temperature of indoor coil thermistor exceeds 158 F (70 C) in HEAT mode. Temperature of outdoor heat exchanger temperature thermistor exceeds 158 F (70 C) in COOL mode. The waveform of compressor current is distorted. Outdoor fan has stopped 3 times in a row within 30 seconds after outdoor fan start-up. Each phase current of compressor cannot be detected normally. Remedy Reconnect connector of compressor. Refer to "How to check inverter/compressor". Check stop valve. Refer to "Check of outdoor thermistors". Replace inverter P.C. board. Refer to "How to check miswiring and serial signal error. Check stop valve. Refer to "Flow chart of the detailed outdoor unit failure mode recall function". Reconnect connector of compressor. Refer to "How to check inverter/compressor". Check stop valve. Check refrigerant circuit and refrigerant amount. Refer to "Check of LEV". Check around outdoor unit. Check outdoor unit air passage. Refer to "Check of outdoor fan motor". Check refrigerant circuit and refrigerant amount. Check stop valve. Reconnect connector of compressor. Refer to "How to check inverter/compressor". Refer to "Check of outdoor fan motor. Refer to "Check of inverter P.C. board. Refer to "How to check inverter/compressor". DC voltage DC voltage of inverter cannot be detected normally. Refer to "How to check inverter/compressor". Frequency drop by Current from power outlet is nearing Max. fuse size. The unit is normal, but check the current protection following. Frequency drop by high pressure protection Frequency drop by defrosting in COOL mode Frequency drop by discharge temperature protection Temperature of indoor coil thermistor exceeds 131 F (55 C) in HEAT mode, compressor frequency lowers. Indoor coil thermistor reads 46 F (8 C) or less in COOL mode, compressor frequency lowers. Temperature of discharge temperature thermistor exceeds 232 F (111 C), compressor frequency lowers. NOTE: 1. The location of LED is illustrated at the right fi gure. Refer to LED is lighted during normal operation. The fl ashing frequency shows the number of times the LED blinks after every 2.5-second OFF. Flashing (Example) When the fl ashing frequency is 2. Check if indoor fi lters are clogged. Check if refrigerant is short. Check if indoor/outdoor unit air circulation is short cycled. Check refrigerant circuit and refrigerant amount. Refer to "Check of LEV". Refer to "Check of outdoor thermistors". Inverter P.C. board (Parts side) LED Flashing MUZ-FE09 /12NA 0.5-second ON 0.5-second ON LED MUZ-FE 18NA ON OFF 2.5-second OFF 2.5-second OFF 21

22 . Symptom LED indication Outdoor unit operates. 7-time fl ash 8-time fl ash Abnormal point/ Condition Low discharge temperature protection MUZ-FE09/12NA PAM protection PAM: Pulse Amplitude Modulation MUZ-FE18NA Zero cross detecting circuit Condition Temperature of discharge temperature thermistor has been 122 F (50 C) or less for 20 minutes. The overcurrent fl ows into IGBT (Insulated Gate Bipolar transistor: TR821) or the bus-bar voltage reaches 320 V or more, PAM stops and restarts. Zero cross signal for PAM control cannot be detected. Remedy Refer to "Check of LEV". Check refrigerant circuit and refrigerant amount. This is not malfunction. PAM protection will be activated in the following cases: 1 Instantaneous power voltage drop (Short time power failure) 2 When the power supply voltage is high time fl ash Inverter check mode The connector of compressor is disconnected, inverter check mode starts. Check if the connector of the compressor is correctly connected. Refer to "How to check inverter/compressor". 22

23 10-4. TROUBLE CRITERION OF MAIN PARTS MUZ-FE09NA MUZ-FE12NA MUZ-FE18NA Part name Check method and criterion Figure Defrost thermistor (RT61) Ambient temperature thermistor (RT65) Outdoor heat exchanger temperature thermistor (RT68) Discharge temperature thermistor (RT62) Fin temperature thermistor (RT64) Measure the resistance with a tester. Refer to Test point diagram and voltage, 1. Inverter P.C. board, the chart of thermistor. Measure the resistance with a tester. Before measurement, hold the thermistor with your hands to warm it up. Refer to Test point diagram and voltage, 1. Inverter P.C. board, the chart of thermistor. Compressor Measure the resistance between terminals using a tester. (Winding temperature: -4 ~ 104 F (-20 ~ 40 C)) U-V U-W V-W rmal MUZ-FE09/12NA MUZ-FE18NA 1.52 ~ 2.17 Ω 0.83 ~ 1.18 Ω WHT RED BLK W V U Outdoor fan motor R. V. coil (21S4) Measure the resistance between lead wires using a tester. (Part temperature: -4 ~ 104 F (-20 ~ 40 C)) Color of lead wire RED BLK BLK WHT WHT RED rmal 11 ~ 16 Ω Measure the resistance using a tester. (Part temperature: 14 ~ 104 F (-10 ~ 40 C)) rmal 0.97 ~ 1.38 kω WHT RED BLK W V U Expansion valve coil (LEV) Measure the resistance using a tester. (Part temperature: 14 ~ 104 F (-10 ~ 40 C)) Color of lead wire WHT RED RED ORN YLW BRN BRN BLU rmal 37 ~ 54 Ω WHT RED ORN LEV YLW BRN BLU 23

24 10-5. TROUBLESHOOTING FLOW A How to check inverter/compressor Disconnect the connector between compressor and the intelligent power module (IPM). Check the voltage between terminals. See Check of open phase. Are the voltages balanced? Replace the inverter P.C. board. Check the compressor. See Check of compressor. B Check of open phase With the connector between the compressor and the intelligent power module disconnected, activate the inverter and check if the inverter is normal by measuring the voltage balance between the terminals. Output voltage is V. (The voltage may differ according to the tester.) << Operation method>> Start cooling or heating operation by pressing EMERGENCY OPERATION switch on the indoor unit. (TEST RUN OPERA- TION: Refer to 7-6.) <<Measurement point>> at 3 points BLK (U) - WHT (V) Measure AC voltage between the lead wires at 3 points. BLK (U) - RED (W) WHT(V) - RED (W) NOTE: 1. Output voltage varies according to power supply voltage. 2. Measure the voltage by analog type tester. 3. During this check, LED of the inverter P.C. board fl ashes 9 times. (Refer to ) C Check of compressor Refer to Check of compressor winding. Is the compressor normal? Refer to Check of compressor operation time. Does the compressor operate continuously? OK. Replace the compressor. Refer to Check of compressor start failure. 24

25 D Check of compressor winding Disconnect the connector between the compressor and intelligent power module, and measure the resistance between the compressor terminals. <<Measurement point>> at 3 points BLK - WHT BLK - RED Measure the resistance between the lead wires at 3 points. WHT - RED <<Judgement>> Refer to [Ω] Abnormal [short] Infinite [Ω] Abnormal [open] NOTE: Be sure to zero the ohmmeter before measurement. E Check of compressor operation time Connect the compressor and activate the inverter. Then measure the time until the inverter stops due to over current. <<Operation method>> Start heating or cooling operation by pressing EMERGENCY OPERATION switch on the indoor unit. (TEST RUN OPERATION: Refer to 7-6.) <<Measurement>> Measure the time from the start of compressor to the stop of compressor due to overcurrent. F Check of compressor start failure <<Judgement>> 0 second 1 second 2 seconds 10 seconds 10 minutes Compressor starts Abnormal (IPM failure) (Compressor winding short) Abnormal (Compressor lock out) (Starting defect) Abnormal (Poor contact,) (Outdoor P.C. board defect) (Disconnected connector) Abnormal (Refrigerant circuit defect) (Closed valve) rmal Confi rm that 1~4 is normal. Electrical circuit check 1. Contact of the compressor connector 2. Output voltage of inverter P.C. board and balance of them (See ) 3. Direct current voltage between DB61(+) and (-) (MUZ-FE09/12NA)/JP715(+) and JP30(-) (MUZ-FE18NA) on the inverter P.C. board 4. Voltage between outdoor terminal block S1-S2 Does the compressor run for 10 seconds or more after it starts? Check the refrigerant circuit. Check the stop valve. After the compressor is heated with a drier, does the compressor start? 1 Compressor start failure. Activate pre-heat control. (Refer to 9-2. "PRE-HEAT CONTROL SETTING") Replace the compressor. 1 Heat the compressor with a drier for about 20 minutes. Do not recover refrigerant gas while heating. 25 Heating part

26 G Check of outdoor thermistors Disconnect the connector of thermistor in the outdoor P.C. board (see below table), and measure the resistance of thermistor. Is the thermistor normal? (Refer to ) Replace the thermistor except RT64. When RT64 is abnormal, replace the inverter P.C. board. Reconnect the connector of thermistor. Turn ON the power supply and press EMERGENCY OPERATION switch. Does the unit operate for 10 minutes or more without showing thermistor abnormality? OK. (Cause is poor contact.) Replace the inverter P.C. board. MUZ-FE09NA MUZ-FE12NA Thermistor Symbol Connector, Pin. Board Defrost RT61 Between CN641 pin1 and pin2 Discharge temperature RT62 Between CN641 pin3 and pin4 Fin temperature RT64 Between CN642 pin1 and pin2 Inverter P.C. board Ambient temperature RT65 Between CN643 pin1 and pin2 Outdoor heat exchanger temperature RT68 Between CN644 pin1 and pin3 MUZ-FE18NA Thermistor Symbol Connector, Pin. Board Defrost RT61 Between CN671 pin1 and pin2 Discharge temperature RT62 Between CN671 pin3 and pin4 Fin temperature RT64 Between CN673 pin1 and pin2 Inverter P.C. board Ambient temperature RT65 Between CN672 pin1 and pin2 Outdoor heat exchanger temperature RT68 Between CN671 pin5 and pin6 H Check of R.V. coil First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to In case CN721 (MUZ-FE09/12NA)/CN602 (MUZ-FE18NA) is disconnected or R.V. coil is open, voltage is generated between the terminal pins of the connector although no signal is being transmitted to R.V. coil. Check if CN721 (MUZ-FE09/12NA)/CN602 (MUZ-FE18NA) is connected. Unit operates COOL mode even if it is set to HEAT mode. Disconnect connector between the compressor and the intelligent power module. Turn ON the power supply and press EMERGENCY OPERATION switch twice (HEAT mode). Is there 208/230 VAC between CN721 (MUZ- FE09/12NA)/CN602 (MUZ-FE18NA) and on the inverter P.C. board 3 minutes after the power supply is turned ON? Replace the inverter P.C. board. Unit operates HEAT mode even if it is set to COOL mode. Disconnect connector between the compressor and the intelligent power module. Turn ON the power supply and press EMERGENCY OPERATION switch once (COOL mode). Replace the 4-way valve. Is there 208/230 VAC between CN721 (MUZ- FE09/12NA)/CN602 (MUZ-FE18NA) and on the inverter P.C. board 3 minutes after the power supply is turned ON? Replace the 4-way valve. 26 Replace the inverter P.C. board.

27 I Check of outdoor fan motor MUZ-FE09NA MUZ-FE12NA Disconnect CN932 from the inverter P.C. board, and measure the resistance of the outdoor fan motor. Is the outdoor fan motor normal? (Refer to 10-4.) Replace the inverter P.C. board. Replace the outdoor fan motor. MUZ-FE18NA Disconnect the connectors CN931 and CN932 from the inverter P.C. board. Check the connection between the connector CN931 and CN932. Is the resistance between each terminal of outdoor fan motor normal? (Refer to 10-4.) Disconnect CN932 from the inverter P.C. board, and turn on the power supply. Rotate the outdoor fan motor manually and measure the voltage of CN931. Between 1(+) and 5(-) Between 2(+) and 5(-) Between 3(+) and 5(-) Replace the outdoor fan motor. (Fixed to either 5 or 0 VDC) Does the voltage between each terminal become 5 and 0 VDC repeatedly? Does the outdoor fan motor rotate smoothly? Replace the inverter P.C. board. 27

28 J Check of power supply MUZ-FE09NA MUZ-FE12NA Disconnect the connector (CN61) between compressor and intelligent power module. Turn ON power supply and press EMERGENCY OPERATION switch. Rectify indoor/outdoor connecting wire. Does POWER lamp on the indoor unit light up? Is there voltage 208/230 VAC between the indoor terminal block S1 and S2? Replace the indoor electronic control P.C. board. Is there bus-bar voltage VDC between DB61 (+) and DB61 ( ) on the inverter P.C. board? (Refer to ) Does LED on the inverter P.C. board light up or fl ash? (Refer to ) Replace the inverter P.C. board VDC Check the electric parts in main circuit. If light up, OK. If fl ash, refer to DB61 Inverter P.C. board (Solder side) 28

29 MUZ-FE18NA Disconnect the connector between compressor and intelligent power module. Turn ON power supply and press EMERGENCY OPERATION switch. Rectify indoor/outdoor connecting wire. Does the upper lamp of OPERATION INDICATOR on the indoor unit light up? Is there voltage 208/230 VAC between the indoor terminal block S1 and S2? Replace the indoor electronic control P.C. board. Is there bus-bar voltage VDC between JP715 (+) and JP30 ( ) on the inverter P.C. board? (Refer to ) Does LED on the inverter P.C. board light up or fl ash? (Refer to ) Replace the inverter P.C. board. Check the electric parts in main circuit. If LED lights up, it is OK. If LED fl ashes, refer to JP30 JP VDC 29

30 K Check of LEV (Expansion valve) Turn ON the power supply. <Preparation of the remote controller> While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time, press RESET button. First, release RESET button. And release the other two buttons after all LCD except the set temperature in operation display section of the remote controller is displayed after 3 seconds. MSZ-FE09NA MSZ-FE12NA MSZ-FE18NA Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit. 1 Expansion valve operates in full-opening direction. 1. Regardless of normal or abnormal condition, a short beep is emitted once the signal is received. Do you hear the expansion valve "click, click "? Do you feel the expansion valve vibrate on touching it? OK. Is LEV coil properly fi xed to the expansion valve? Does the resistance of LEV coil have the characteristics? (Refer to 10-4.) Replace the LEV coil. Properly fi x the LEV coil to the expansion valve. Measure each voltage between connector pins of CN724 on the inverter P.C. board. 1. Pin (-) Pin (+) 2. Pin (-) Pin (+) 3. Pin (-) Pin (+) 4. Pin (-) Pin (+) Is there about 3 ~ 5 VAC between each? NOTE: Measure the voltage by an analog tester. Replace the inverter P.C. board. Replace the expansion valve. NOTE: After check of LEV, do the undermentioned operations. 1. Turn OFF the power supply and turn ON it again. 2. Press RESET button on the remote controller. 30

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