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OUTDOOR UNIT SERVICE MANUAL Wireless type Models MUZ-FD09NA MUZ-FD09NA- U1 MUZ-FD12NA MUZ-FD12NA- U1 HFC utilized R410A CONTENTS No. OBH498 Indoor unit service manual MSZ-FD•NA Series (OBH497) NOTE: RoHS compliant products have mark on the spec name plate. 1. TECHNICAL CHANGES ··································· 3 2. PART NAMES AND FUNCTIONS ····················· 3 3. SPECIFICATION ················································ 4 4. OUTLINES AND DIMENSIONS ························ 6 5. WIRING DIAGRAM ············································ 7 6. REFRIGERANT SYSTEM DIAGRAM ··············· 8 7. DATA ·································································· 9 8. ACTUATOR CONTROL ··································· 15 9. SERVICE FUNCTIONS ··································· 16 10. TROUBLESHOOTING ····································· 16 11. DISASSEMBLY INSTRUCTIONS ···················· 32 PARTS CATALOG (OBB498) TM 2 1 TECHNICAL CHANGES MUZ-FD09NA MUZ-FD12NA MUZ-FD09NA - U1 MUZ-FD12NA - U1 1. New model 2 PART NAMES AND FUNCTIONS MUZ-FD09NA MUZ-FD12NA Air inlet Piping Drain hose Air outlet Drain outlet 3 3 SPECIFICATION Outdoor unit model MUZ-FD09NA MUZ-FD12NA Capacity Rated (Minimum~Maximum) Cooling 1 Btu/h 9,000 (2,800~9,000) 12,000 (2,800~12,000) Heating 47 1 Btu/h 10,900 (3,000~18,000) 13,600 (3,000~21,000) Capacity Rated Heating 17 2 Btu/h 7,700 8,300 Power consumption Rated (Minimum~Maximum) Cooling 1 W 650 (160~650) 960 (160~960) Heating 47 1 W 750 (150~2,400) 980 (150~2,400) Power consumption Rated Heating 17 2 W 1,730 1,780 EER 1 [SEER] 3 Cooling 13.8 [23.0] 12.5 [22.0] HSPF IV(V) 4 Heating 10.55 (7.4) 10.55 (7.4) COP Heating 1 4.30 4.10 External nish Munsell 3Y 7.8/1.1 Power supply V , phase , Hz 208/230 , 1 , 60 Max. fuse size (time delay) A 15 Min. circuit ampacity A 12 Fan motor F.L.A 0.56 Model SNB130FQAH Compressor R.L.A 8.6 L.R.A 10.8 Refrigerant control Liner expansion valve Sound level 1 Cooling dB(A) 48 48 Heating dB(A) 49 49 Defrost method Reverse cycle W in. 31-1/2 Dimensions D in. 11-1/4 H in. 21-5/8 Weight Ib. 80 Remote controller Wireless type Control voltage (by built-in transformer) VDC 12 - 24 Refrigerant piping Not supplied Refrigerant pipe size (Min. wall thickness) Liquid in. 1/4 (0.0315) Gas in. 3/8 (0.0315) Connection method Indoor Flared Outdoor Flared Between the indoor & outdoor units Height differ ence ft. 40 Piping length ft. 65 Refrigerant charge (R410A) 2 lb. 9 oz. Refrigeration oil (Model) NE022 NOTE : Test conditions are based on ARI 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 4 Test condition 3, 4 ARI Mode Test Indoor air condition Outdoor air condition Dry bulb (°F) Wet bulb (°F) Dry bulb (°F) Wet bulb (°F) "A" Cooling Steady State at rated compressor Speed 80 67 95 (75) "B-2" Cooling Steady State at rated compressor Speed 80 67 82 (65) SEER (Cooling) HSPF (Heating) "B-1" Cooling Steady State at minimum compressor Speed 80 67 82 (65) Low ambient Cooling Steady State at minimum compressor Speed 80 67 67 (53.5) Intermediate Cooling Steady State at Intermediate compressor Speed 5 80 67 87 (69) Standard Rating-Heating at rated compressor Speed 70 60 47 43 Low temperature Heating at rated compressor Speed 70 60 17 15 Max temperature Heating at minimum compressor Speed 70 60 62 56.5 High temperature Heating at minimum compressor Speed 70 60 47 43 Frost Accumulation at rated compressor Speed 70 60 35 33 Frost Accumulation at Intermediate compressor Speed 5 70 60 35 33 5 : At Intermediate compressor Speed =("Cooling rated compressor speed" - "minimum compressor speed") / 3 + "minimum compressor speed". OPERATING RANGE (1) POWER SUPPLY Rated voltage Guaranteed Voltage Outdoor unit (2) OPERATION 208/230 V 1 phase 60 Hz Min.187 V 208 V 230 V Max.253 V Intake air temperature (°F) Mode Condition lndoor Outdoor DB WB DB WB Cooling Heating Standard temperature 80 67 95 — Maximum temperature 90 73 115 — Minimum temperature 67 57 14 — Maximum humidity 78 % — Standard temperature 70 60 47 43 Maximum temperature 80 67 75 65 Minimum temperature 70 60 14 13 5 4 OUTLINES AND DIMENSIONS MUZ-FD09NA Unit: inch MUZ-FD12NA REQUIRED SPACE Basically open 4 inch or more 4 / 3 - 1 Air in 15-3/4 Air in Air out Drain hole 1-5/8 1-9/16 6 1/ 11 4 / 3- 2 1 ~ 21 6 1/ 9- 31 4 in. or more without any obstruction in front and on both sides of the unit. 4 in. or more 14 in. or more 8 / 5- 12 7/8 handle 2 2- 3/8 13/16 Oval hole 29/32 11-1/4 17/32 8 in. or more Open two sides of left, right, or rear side. 3 / 1 - 1 1 2 3 / 3 1 2 8 / 7 - 5 11-29/32 5-15/16 19-11/16 Liquid pipe :1/4 (flared) Gas pipe :3/8 (flared) 6-23/32 31-1/2 2-23/32 6 5 WIRING DIAGRAM MUZ-FD09NA MUZ-FD12NA 7 6 REFRIGERANT SYSTEM DIAGRAM MUZ-FD09NA Unit:inch MUZ-FD12NA Refrigerant pipe ø3/8 (with heat insulator) Muffler Stop valve (with service port) 4-way valve Discharge Outdoor heat exchanger temperature thermistor RT68 Muffler Outdoor heat exchanger Flared connection temperature thermistor RT62 Service port Service port Compressor Defrost thermistor RT61 Capillary tube Ambient temperature thermistor RT65 Flared connection Stop valve (with strainer) Capillary tube O.D. 0.118 × I.D. 0.071 × 23-5/8 (ø3.0 × ø1.8 × 600) Expansion valve Strainer #100 R.V. coil heating ON cooling OFF Refrigerant pipe 1/4 (with heat insulator) O.D. 0.118 × I.D. 0.079 × 9-7/16 (ø3.0 × ø2.0 × 240) Refrigerant flow in cooling Refrigerant flow in heating MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE Refrigerant piping : ft Piping size O.D : in Model MUZ-FD09NA Max. Length A Max. Height difference B Gas Liquid MUZ-FD12NA 65 40 3/8 1/4 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 Outdoor unit precharged Refrigerant piping length (one way) : ft 25 30 40 50 60 65 MUZ-FD09NA MUZ-FD12NA 2 lb. 9 oz. 0 1.62 4.86 8.10 11.34 12.96 Calculation : X oz. = 1.62/ 5 oz./ ft x (Refrigerant piping length (ft) - 25) NOTE : Refrigerant piping exceeding 25 ft. requires additional refrigerant charge according to the calculation. 8 7 DATA MUZ-FD09NA MUZ-FD12NA 7-1. PERFORMANCE DATA 1) COOLING CAPACITY Indoor air Outdoor intake air DB temperature (˚F) Model MUZ-FD09NA MUZ-FD12NA IWB 75 85 95 105 115 (˚F) TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC 71 11.0 6.9 0.58 10.3 6.5 0.63 9.7 6.1 0.68 9.0 5.6 0.72 8.3 5.2 0.75 67 10.4 7.9 0.55 9.7 7.4 0.60 9.0 6.8 0.65 8.4 6.4 0.69 7.7 5.8 0.72 63 9.8 8.8 0.52 9.1 8.1 0.58 8.5 7.6 0.62 7.7 6.9 0.66 7.0 6.3 0.69 71 14.7 8.8 0.85 13.7 8.2 0.94 12.9 7.7 1.01 12.0 7.2 1.06 11.0 6.6 1.10 67 13.9 10.2 0.81 13.0 9.5 0.89 12.0 8.8 0.96 11.2 8.1 1.02 10.3 7.5 1.07 63 13.1 11.3 0.77 12.1 10.5 0.85 11.3 9.7 0.92 10.3 8.9 0.98 9.4 8.1 1.02 NOTE : 1. IWB : Intake air wet-bulb temperature TC : Total Capacity (x103Btu/h) SHC : Sensible Heat Capacity (x103Btu/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.) 40 65 MUZ-FD09NA MUY-FD12NA 1.0 0.954 0.878 3) HEATING CAPACITY Indoor air Outdoor intake air WB temperature (˚F) Model MUZ-FD09NA MUZ-FD12NA IDB 15 25 35 43 45 55 (˚F) TC TPC TC TPC TC TPC TC TPC TC TPC TC TPC 75 6.3 0.56 7.9 0.66 9.4 0.73 10.6 0.77 11.0 0.78 12.4 0.81 70 6.7 0.54 8.2 0.64 9.6 0.71 10.9 0.75 11.2 0.77 12.7 0.80 65 6.9 0.52 8.6 0.62 10.0 0.69 11.2 0.73 11.6 0.74 13.0 0.78 75 7.9 0.73 9.9 0.86 11.8 0.96 13.3 1.00 13.7 1.02 15.5 1.06 70 8.4 0.71 10.2 0.84 12.0 0.93 13.6 0.98 14.0 1.00 15.8 1.04 65 8.6 0.68 10.7 0.81 12.4 0.91 14.0 0.96 14.4 0.97 16.2 1.02 NOTE : 1. IDB : Intake air dry-bulb temperature TC : Total Capacity (x103 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 7-2. PERFORMANCE CURVE Cooling MUZ-FD09NA MUZ-FD12NA y t ic a p a c l a t o T n o it p m u s n o c r e w o p l a t ) h / u t B 3 0 1 ( ) W k ( 13 12 11 10 9 8 7 0.7 0.6 0.5 SHF at rating condition = 0.76 Airflow = 307 CFM Indoor intake air WB temperature (°F) Indoor intake air WB temperature (°F) 71 67 63 7167 63 y t ic a p a c l a t o T n o it p m u s n o c r e w o p l a t ) h / u t B 3 0 1 ( ) W k ( 15 14 13 12 11 10 9 1.2 1.1 1.0 0.9 0.8 0.7 SHF at rating condition = 0.73 Airflow = 350 CFM Indoor intake air WB temperature (°F) Indoor intake air WB temperature (°F) 71 67 63 71 67 63 o T Heating 65 75 85 95 105 115 o T Outdoor intake air DB temperature (°F) 65 75 85 95 105 115 Outdoor intake air DB temperature (°F) MUZ-FD09NA MUZ-FD12NA y t ic a p a c l a t o T n o it p m u s n o c r e w o p l a t ) h / u t B 3 0 1 ( ) W k ( 12 10 8 6 0.8 0.6 0.4 Airflow = 381 CFM Indoor intake air DB temperature (°F) Indoor intake air DB temperature (°F) 65 70 75 75 70 65 y t ic a p a c l a t o T n o it p m u s n o c r e w o p l a t o T ) h / u t B 3 0 1 ( ) W k ( 20 18 16 14 12 10 8 6 1.1 1.0 0.9 0.8 0.7 0.6 Airflow = 420 CFM Indoor intake air DB temperature (°F) Indoor intake air DB temperature (°F) 65 70 75 75 70 65 o 15 25 35 45 55 T Outdoor intake air WB temperature (°F) 15 25 35 45 55 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. 10 7-3. CONDENSING PRESSURE Cooling Data is based on the condition of indoor humidity 50 %. Air flow should be set to High speed. MUZ-FD09NA (PSIG) 580 540 e r (PSIG) 180 u s s e r p g n is n e d n o C 500 460 420 380 340 300 260 Indoor DB temperature (°F) 8680 7570 e r u s s e r p n o it c u S 175 170 165 160 155 150 145 140 135 130 125 120 Indoor DB temperature (°F) 86 80 75 70 68 70 75 80 85 90 95 100 105(°F) Outdoor ambient temperature MUZ-FD12NA (PSIG) 580 540 e r 68 70 75 80 85 90 95 100 105(°F) Outdoor ambient temperature (PSIG) 180 u s s e r p g n is n e dn o C 500 460 420 380 340 300 260 Indoor DB temperature (°F) 8680 7570 e r u s s e r p n o it c u S 175 170 165 160 155 150 145 140 135 130 125 120 Indoor DB temperature (°F) 86 80 75 70 68 70 75 80 85 90 95 100 105(°F) Outdoor ambient temperature 68 70 75 80 85 90 95 100 105(°F) Outdoor ambient temperature 11 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-FD09NA (PSIG) (PSIG) 400 380 170 Indoor DB temperature(°F)75 e r u s s e r p g n is n e 360 340 320 300 280 260 240 75 70 65 e r u s s e r p n o i t 160 150 140 130 120 110 70 65 Indoor DB temperature (°F) 58Hz 58Hz c d u n 220 S o C 200 180 160 140 14 20 25 30 35 40 45 50 55 60 65 70(°F) Outdoor ambient temperature 100 90 80 70 60 14 20 25 30 35 40 45 50 55 Outdoor ambient temperature 60 65 70(°F) MUZ-FD12NA (PSIG) (PSIG) 400 380 170 Indoor DB temperature(°F)75 e r u s s e r p g n is n e 360 340 320 300 280 260 240 75 70 65 e r u s s e r p n o i t 160 150 140 130 120 110 70 65 Indoor DB temperature (°F) 58Hz 58Hz c d u n 220 S o C 200 180 160 140 14 20 25 30 35 40 45 50 55 60 65 70(°F) Outdoor ambient temperature 100 90 80 70 60 14 20 25 30 35 40 45 50 55 Outdoor ambient temperature 12 60 65 70(°F) 7-4. STANDARD OPERATION DATA Model MSZ-FD09NA MSZ-FD12NA Item Unit Cooling Heating Cooling Heating Capacity Btu/h 9,000 10,900 12,000 13,600 SHF — 0.76 — 0.73 — l a t Input kW 0.650 0.750 0.960 0.980 o T Rated frequency Hz 35 43 51 54 Indoor unit MSZ-FD09NA MSZ-FD12NA V, Power supply phase, Hz 208/230 , 1 , 60 Input kW 0.018 0.024 0.024 0.030 t i u Fan motor current A 0.19/0.17 0.25/0.23 0.25/0.23 0.32/0.29 c r i c Outdoor unit MUZ-FD09NA MUZ-FD12NA l a V, c i r t c e lE Power supply phase, Hz 208/230 , 1 , 60 Input kW 0.632 0.726 0.936 0.950 Comp. current A 2.96/2.68 3.39/3.06 4.40/3.97 4.43/4.01 Fan motor current A 0.35/0.32 Condensing pressure PSIG 376 355 402 392 Suction pressure PSIG 154 108 148 104 t i Discharge temperature ˚F 143 144 161 159 u c r i Condensing temperature ˚F 112 108 117 115 c t n Suction temperature ˚F 51 46 51 45 a r e Comp. shell bottom temperature ˚F 144 128 146 129 g i r f e Ref. pipe length ft. 25 R Refrigerant charge (R410A) 2 lb. 9 oz. Intake air temperatureDB ˚F 80 70 80 70 WB ˚F 67 60 67 60 t i Discharge air temperatureDB ˚F 59 100 56 105 n u r WB ˚F 56 — 54 — o o d Fan speed (High) rpm 1,020 1,120 1,120 1,220 n I Airfl ow (High) CFM 307 (Wet) 381 350 (Wet) 420 Intake air temperatureDB ˚F 95 47 95 47 t i n WB ˚F — 43 — 43 u r o Fan speed rpm 810 870 810 870 o d t Airfl ow CFM 1,102 1,187 1,102 1,187u O 13 7-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY MUZ-FD09NA s r o tc a f n o it c e r r o c y ti c a pa C Correction of Cooling capacity 1.5 1.0 0.5 s r o tc a f n o it c e r r o c tu p n I Correction of Cooling total input 1.5 1.0 0.5 s r o tc a f n o it c e r r o c y ti c a pa C 2.0 1.5 1.0 0.5 Correction of Heating capacity s r o t c a f n o i t c e r r o c t u p n I Correction of Heating total input 3.0 2.0 1.0 0 50 100 150 (Hz) 0 50 100 150 (Hz) 0 50 100 150 (Hz) 0 50 100 150 (Hz) The operational frequency of compressor MUZ-FD12NA Correction of Cooling capacity 1.5 s r The operational frequency of compressor Correction of Cooling total input 1.5 s r The operational frequency of compressor Correction of Heating capacity 1.5 The operational frequency of compressor Correction of Heating total input o tc a f n o it c e r r o c y ti c a pa C 1.0 0.5 s r o tc a f n o it c e r r o c tu p n I 1.0 0.5 o tc a f n o it c e r r o c y ti c a pa C 1.0 0.5 s r o tc a f n o it c e r r o c tu p n I 2.0 1.0 (Hz) 0 50 100 150 (Hz) 0 50 100 150 The operational frequency of compressor 0 50 100 150 (Hz) 0 50 100 150 (Hz) The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor 7-6. TEST RUN OPERATION (How to operate fixed-frequency operation) 1. Press EMERGENCY OPERATION switch to 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. 14 8 ACTUATOR CONTROL MUZ-FD09NA MUZ-FD12NA 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. 5 seconds 15 seconds ON Compressor OFF ON Outdoor fan motor 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. ON OFF Compressor R.V.coil ON OFF 5 seconds 5 seconds Outdoor fan motor ON OFF 8-3. RELATION BETWEEN MAIN SENSOR AND ACTUATOR Actuator Sensor Purpose Compressor LEV Outdoor fan motor R.V. coil Indoor fan Discharge temperature thermistor Protection ○ ○ Indoor coil temperature thermistor Cooling : Coil frost prevention ○ Heating : High pressure protection ○ ○ Defrost thermistor Cooling : High pressure protection ○ ○ motor Heating : Defrosting ○○○○○ Fin temperature thermistor Protection ○ ○ Outdoor heat exchanger temperature thermistor High pressure protection ○○○ Ambient temperature thermistor Low ambient temperature operation ○○○ 15 9 SERVICE FUNCTIONS MUZ-FD09VA MUZ-FD12VA 9-1. CHANGE IN DEFROST SETTING Changing defrost finish temperature To change the defrost finish temperature, cut/solder the JS wire of the outdoor inverter P.C. board. (Refer to 10-6-1.) Jumper Defrost fi nish temperature Soldered JS (Initial setting) 41 °F (5 °C) None (Cut) 50 °F (10 °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 tempera ture. 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) To activate the pre-heat control, cut the JK wire of the inverter P.C. board. (Refer to 10-6.1) NOTE: When the inverter P.C. board is replaced, check the Jumper wires, and cut/solder them if necessary. 10 TROUBLESHOOTING MUZ-FD09NA MUZ-FD12NA 10-1. 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 con firming 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 to 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. 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 10-3. 16 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. This mode is very useful when the unit needs to be repaired for the abnormality which doesn't recur. 1. Flow chart of failure mode recall function for the indoor/outdoor unit Operational procedure The cause of abnormality cannot be found because the abnormality doesn't recur. Setting up the failure mode recall function Turn ON the power supply. 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. 1. Regardless of normal or ab normal condition, a short beep 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 is emitted once the signal is received. Does POWER lamp on the indoor unit blink at the interval of 0.5 seconds? Blinks: Either indoor or outdoor unit is abnormal. Beep is emit ted at the same timing as the blinking of POWER lamp. 2 Yes No (OFF) Indoor unit is normal. But the outdoor unit might be abnormal because there are some abnor malities that can't be recalled with this way. Confi rm if outdoor unit is abnormal according to the detailed outdoor unit failure mode recall function. (Refer to 10-2.2) Judgment of indoor/outdoor abnormality (Blinks) Before blinking, does POWER lamp stay ON for 3 seconds? Stays ON for 3 seconds (without beep): The outdoor unit is abnormal. No The indoor unit is abnormal. Yes The outdoor 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 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 Check the blinking pattern, and confi rm the abnormal point with the outdoor unit failure mode table. (Refer to 10-2.3) Make sure to check at least two consecutive blinking cycles. 3 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's 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 ON OFF Blinking at 0.5- second interval Beeps 2.5-second OFF Blinking at 0.5- second interval Beeps Beeps Repeated cycle Repeated cycle 3.Blinking pattern when the outdoor unit is abnormal: Blinking at 0.5- Repeated cycle Blinking at 0.5- 2.5-second OFF 3-second ON ON OFF second interval 2.5-second OFF 3-second ON second interval No beep Beeps Repeated cycle No beep Beeps Repeated cycle Repeated cycle 17 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). 1 Does POWER lamp on the indoor unit blink at the interval of 0.5 seconds? 1. Regardless of normal or abnormal condition, 2 short beeps are emitted as the signal is received. Blinks: The outdoor unit is abnormal. Beep is emitted at the same timing as the blinking of POWER lamp. 2 Yes (Blinks) The outdoor unit is abnormal. No (OFF) Check the blinking pattern, and confi rm the abnormal point with the out door unit failure mode table (10-2.3.). Make sure to check at least two consecutive blinking cycles. 2 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 The outdoor unit is normal. Release the failure mode recall function accord ing to the left mentioned procedure. After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall function" (10-2.1.). 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" men tioned above. NOTE: 1. Make sure to release the failure mode recall function once it's 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 ON Blinking at 0.5- second interval 2.5-second OFF 3-second ON Blinking at 0.5- second interval OFFNo beep Beeps Repeated cycle No beep Beeps Repeated cycle Repeated cycle 18 3. Outdoor unit failure mode table POWER lamp (Indoor unit) Abnormal point (Failure mode / protection) LED indication (Outdoor P.C. board) Condition Correspondence Indoor/outdoor unit failure mode recall function Outdoor unit failure mode recall function OFF None (Normal) — — —— — 2-time fl ash 2.5 seconds OFF 3-time fl ash Outdoor power system — thermistor 1-time fl ash every Overcurrent protection stop is •• continuously performed 3 times within 1 minute after the compressor gets started. • Reconnect connectors. Refer to 10-5. "How to check inverter/ compressor". Check stop valve. ○ ○ Discharge temperature 2.5 seconds Thermistor shorts or opens during compressor running. Refer to 10-5. 2.5 seconds OFF Defrost thermistor Fin temperature thermistor 3-time fl ash • ○ ○ "Check of outdoor thermistors". Defective outdoor thermistors can be 2.5 seconds OFF thermistor 4-time fl ash identifi ed by checking the blinking pattern of LED. P.C. board temperature Ambient temperature 2.5 seconds OFF 4-time fl ash thermistor 2-time fl ash 2.5 seconds OFF Overcurrent 11-time fl ash 2.5 seconds OFF Large current fl ows into intelligent power module. Reconnect compressor 2.5 seconds OFF — ○ Compressor synchronous • • • 2.5 seconds OFF Waveform of compressor current is connector. Refer to 10-5. "How to check inverter/ compressor". Check stop valve. 12-time fl ash distorted. Reconnect compressor • abnormality (Compressor connector. start-up failure protection) • — ○ Refer to 10-5. "How to check inverter/ compressor". 5-time fl ash 2.5 seconds OFF Discharge temperature Temperature of discharge temperature • thermistor exceeds 241 °F (116 °C), compressor stops. Check refrigerant circuit and refrigerant amount. — Compressor can restart if discharge temperature thermistor reads 212 °F (100 °C) or less 3 minutes later. • — ○ Refer to 10-5. "Check of LEV". 6-time fl ash 2.5 seconds High pressure Temperature of indoor coil thermistor • exceeds 158 °F (70 °C) in HEAT mode. Check refrigerant circuit and refrigerant OFF 7-time fl ash — temperature 7-time fl ash Temperature of defrost thermistor exceeds 158 °F (70 °C) in COOL mode. • — ○ amount. Check stop valve. 2.5 seconds OFF Fin temperature/ P.C. board 2.5 seconds OFF Temperature of fi n temperature • thermistor on the inverter P.C. board exceeds 167 ~ 176 °F (75 ~ 80 °C), or • Check around outdoor unit. Check outdoor unit air temperature of P.C. board temperature thermistor on the inverter P.C. board exceeds 158 ~ 167 °F (70 ~ 75 °C). • — ○ passage. Refer to 10-5. "Check of outdoor fan motor". 8-time fl ash 2.5 seconds OFF 9-time fl ash Outdoor fan motor — Nonvolatile memory data 5-time fl ash Outdoor fan has stopped 3 times in a • row within 30 seconds after outdoor fan start-up. Refer to 10-5. "Check of outdoor fan motor". Refer to 10-5. "Check of inverter P.C. board". — ○ 2.5 seconds OFF 2.5 seconds OFF Nonvolatile memory data cannot be read properly. Replace the inverter •○ ○ P.C. board. 10-time fl ash 2.5 seconds Discharge temperature Temperature of discharge temperature • thermistor has been 122 °F (50 °C) or Refer to 10-5. "Check of LEV". OFF 11-time fl ash — DC voltage 8-time fl ash less for 20 minutes. • — ○ Check refrigerant circuit and refrigerant amount. 2.5 seconds OFF DC voltage of inverter cannot be detected normally. Refer to 10-5. "How 2.5 seconds • to check inverter/ Each phase current of — ○ OFF 12-time fl ash compressor 9-time fl ash 2.5 seconds OFF Each phase current of compressor cannot be detected normally. open-phase 10-time fl ash compressor". 2.5 seconds OFF Overcurrent Compressor 2.5 seconds OFF Large current fl ows into intelligent power module (IPM). The open-phase operation of compressor is detected. • • — ○ Reconnect compressor connector. Refer to 10-5. "How to check inverter/ 14-time fl ash Stop valve (Closed valve) 14-time fl ash The interphase short out occurs in the output of the intelligent power module (IPM). The compressor winding shorts out. compressor". 2.5 seconds OFF 2.5 seconds OFF Closed valve is detected by compressor current. •Check stop valve ○ ○ NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (10-3.). 19 10-3. TROUBLESHOOTING CHECK TABLE No. Symptom LED indication Abnormal point/ Condition Condition Correspondence does not oper ate. 1-time fl ash every Outdoor unit 1 2 2.5 seconds Outdoor power sys tem 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, P.C. board temperature thermistor or ambi ent temperature thermistor shorts or opens during compressor running. Reconnect connector of compres sor. Refer to 10-5. "How to check in verter/ compressor". Check stop valve. Refer to 10-5. "Check of outdoor thermistors". 3Outdoor control sys tem Nonvolatile memory data cannot be read properly. (POWER lamp of the indoor unit lights up or fl ashes 7-time.) 4 6-time fl ash 2.5 seconds OFF Serial signal The communication fails between the indoor and outdoor unit •Replace inverter P.C. board. for 3 minutes. Refer to 10-5. "How to check • 5 11-time fl ash 2.5 seconds OFF Stop valve/ miswiring and serial signal error. Closed valve Closed valve is detected by compressor current. •Check stop valve. 2.5 seconds OFF Outdoor unit 14-time fl ash (Other abnormality) Outdoor unit is defective. Refer to 10-2.2. "Flow chart of the 6 7 'Outdoor unit stops and restarts 3 min utes later' is repeated. • 2-time fl ash 2.5 seconds OFF Overcurrent protec tion Large current fl ows into intelligent power module. • When overcurrent protection occurs within 10 seconds after compressor starts, compressor restarts after 15 seconds. • • 2.5 seconds OFF Discharge tempera ture overheat protec tion Temperature of discharge temperature thermistor exceeds 241 detailed outdoor unit failure mode recall function". Reconnect connector of compres sor. Refer to 10-5. "How to check in verter/compressor". Check stop valve. 3-time fl ash 8 4-time fl ash 2.5 seconds OFF Fin temperature /P.C. board temperature thermistor overheat 9 protection • °F (116 °C), compressor stops. Compressor can restart if dis charge temperature thermistor reads 212 °F (100 °C) or less 3 • minutes later. Temperature of fi n temperature thermistor on the heat sink ex ceeds 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). Check refrigerant circuit and refrig erant amount. Refer to 10-5. "Check of LEV". Check around outdoor unit. Check outdoor unit air passage. Refer to 10-5. "Check of outdoor fan motor". 105-time fl ash 2.5 seconds OFF High pressure pro tection Indoor coil thermistor exceeds 158 °F (70 °C) in HEAT mode. Defrost thermistor exceeds 158 °F (70 °C) in COOL mode. Check refrigerant circuit and refrig erant amount. • • Check stop valve. 2.5 seconds OFF Compressor syn chronous abnormal ity The waveform of compressor current is distorted. Reconnect connector of compres sor. 8-time fl ash • 11 • 2.5 seconds OFF Outdoor fan motor Outdoor fan has stopped 3 times in a row within 30 seconds Refer to 10-5. "How to check in verter/compressor". 10-time fl ash after outdoor fan start-up. Refer to 10-5. "Check of outdoor • 12 • 13 12-time fl ash 2.5 seconds OFF Each phase current fan motor. Refer to 10-5. "Check of inverter P.C. board. of compressor Each phase current of compressor cannot be detected nor mally Refer to 10-5. "How to check in verter/compressor". • 14 13-time fl ash 2.5 seconds OFF DC voltage DC voltage of inverter cannot be detected normally. Refer to 10-5. "How to check in verter/compressor". • 15 Outdoor unit operates. 1-time fl ash 2.5 seconds OFF Frequency drop by current protection Current from power outlet reaches the protection current, and compressor frequency lowers. The unit is normal, but check the ••• 2.5 seconds OFF Frequency drop by following. Check if indoor fi lters are clogged. 3-time fl ash high pressure pro tection Temperature of indoor coil thermistor exceeds 131 °F (55 °C) in HEAT mode, compressor frequency lowers. Check if refrigerant is short. Check if indoor/outdoor unit air cir 16 4-time fl ash Frequency drop by defrosting in COOL mode Indoor coil thermistor reads 46 °F (8 °C) or less in COOL mode, compressor frequency lowers. • culation is short cycled. 2.5 seconds OFF Frequency drop by discharge tempera ture protection Temperature of discharge temperature thermistor exceeds 232 °F (111 °C), compressor frequency lowers. Check refrigerant circuit and refrig erant amount. 17 •• Refer to 10-5. "Check of LEV". Refer to 10-5. "Check of outdoor thermistors". NOTE: 1. The location of LED is illustrated at the right fi gure. Refer to 10-6.1. 2. 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". 0.5-second ON 0.5-second ON ON OFF2.5-second OFF 2.5-second OFF Inverter P.C. board(Parts side) LED Flashing → 20 No. Symptom LED indication Abnormal point/ Condition Condition Correspondence operates. 7-time fl ash Outdoor unit 2.5 seconds OFF Low discharge tem perature protection Temperature of discharge temperature thermistor has been 122 °F (50 °C) or less for 20 minutes. Refer to 10-5. "Check of LEV". •• 18 2.5 seconds OFF PAM protection PAM: Check refrigerant circuit and refrig erant amount. 8-time fl ash 19 Pulse Amplitude Modulation The overcurrent fl ows into IGBT (Insulated Gate Bipolar tran sistor : TR821) or when the bus-bar voltage reaches 320 V or more, PAM stops and restarts. This is not malfunction. PAM protec tion will be activated in the following cases; 1 Instantaneous power voltage drop (Short time power failure) 2 When the power supply voltage is high. 2.5 seconds OFF Inverter check mode The connector of compressor is disconnected, inverter check 9-time fl ash 20 mode starts. Check if the connector of the com pressor is correctly connected. • Refer to 10-5. "How to check inverter/ compressor". 21 10-4. TROUBLE CRITERION OF MAIN PARTS MUZ-FD09NA MUZ-FD12NA Part name Check method and criterion Figure Defrost thermistor (RT61) Ambient temperature thermistor (RT65) Outdoor heat ex changer temperature thermistor (RT68) Discharge tem perature thermistor (RT62) Fin temperature thermistor (RT64) Measure the resistance with a tester. Refer to 10-6. "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 10-6. "Test point diagram and voltage",1. "Inverter P.C. board", the chart of thermistor. Measure the resistance between terminals using a tester. (Winding temperature : -4 ~ 104 °F (-20 ~ 40 °C)) WHT RED BLK Compressor Normal U-V V-W1.52 ~ 2.17 Ω U-W Measure the resistance between lead wires using a tester. 2 3 1 W U V (Part temperature : 14 ~ 104 °F (-10 ~ 40 °C)) WHT RED BLK Outdoor fan motor R. V. coil (21S4) Color of lead wire Normal RED – BLK WHT – RED 11 ~ 16 Ω BLK – WHT Measure the resistance using a tester. (Part temperature : 14 ~ 104 °F (-10 ~ 40 °C)) Normal 970 ~ 1380 Ω Measure the resistance using a tester. (Part temperature : 14 ~ 104 °F (-10 ~ 40 °C)) 2 3 1 W U V WHT Expansion valve coil (LEV) Color of lead wire Normal WHT – RED 37 ~ 54 Ω RED – ORN YLW – BRN BRN – BLU RED ORN W L Y LEV N R B UL B 22 10-5. TROUBLESHOOTING FLOW POWER lamp fl ashes 5-times. Outdoor unit does not operate. A How to check inverter/ compressor Disconnect the connector (CN61) between compressor and the intelligent power module (IPM). Check the voltage between terminals. Are the voltages balanced? Yes No See 10-5. "Check of open phase". Replace the inverter P.C. board. Check the compressor. See 10-5. "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 balance of voltage between the terminals. Output voltage 115 V << Operation method>> Start cooling or heating operation by pressing EMERGENCY OPERATION switch on the indoor unit. (TEST RUN OPERATION : Refer to 7-6.) <> at 3 points BLK (U)-WHT (V) BLK (U)-RED (W) WHT(V)-RED (W) Measure AC voltage between the lead wires at 3 points. 9-time flash 2.5-second OFF 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 10-6.1.) C Check of compressor Refer to 10-5. "Check of compressor winding". Is the compressor normal? Yes Refer to 10-5. "Check of compressor Replace the compressor. No operation time". Does the compressor operate continuously? Yes OK. Refer to 10-5. "Check of compressor start failure". No 23 D Check of compressor winding ●Disconnect the connector (CN61) between the compressor and intelligent power module, and measure the resistance between the compressor terminals. <> at 3 points BLK-WHT BLK-RED WHT-RED <> Refer to 10-4. Measure the resistance between the lead wires at 3 points. 0[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. <> Start heating or cooling operation by pressing EMERGENCY OPERATION switch on the indoor unit. (TEST RUN OPERATION : Refer to 7-6.) <> Measure the time from the start of compressor to the stop of compressor due to overcurrent. F Check of compressor start failure Confi rm that 1~4 is normal. • Electrical circuit check <>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) Normal Contact of the compressor connector (including CN61) 1. 2. Output voltage of inverter P.C. board and balance of them (See 10-5. ) 3. Direct current voltage between DB61(+) and (-) 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? No After the compressor is heated with a drier, Check the refrigerant circuit. Yes Check the stop valve. does the compressor start? 1 Replace the compressor. No Yes Compressor start failure. Activate pre-heat control. (Refer to 9-2. "PRE-HEAT CONTROL SETTING") 1 Heat the compressor with a drier for about 20 minutes. Do not recover refrigerant gas while heating. Heating part 24 POWER lamp flashes 6-time. The thermistors in the outdoor unit are abnormal. 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 10-6.1.) Replace the thermistor except RT64. When RT64 is Yes Reconnect the connector of thermistor. No abnormal, replace the inverter P.C. board. Turn ON the power supply and press EMERGENCY OPERATION switch. Does the unit operate for 10 minutes or more without showing thermistor abnormality? Yes OK. (Cause is poor contact.) No Replace the inverter P.C. board. Thermistor Symbol Connector, Pin No. Board Defrost RT61 Between CN641 pin1 and pin2 Discharge temperature RT62 Between CN641 pin3 and pin4 Fin temperature RT64 Between CN642 pin1 and pin2 Ambient temperature RT65 Between CN643 pin1 and pin2 Outdoor heat exchanger temperature RT68 Between CN644 pin1 and pin3 H Check of R.V. coil Inverter P.C. board First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to 10-4. In case CN721 is not connected or R.V. coil is open, voltage is generated between the terminal pins of the connector although any signal is not being transmitted to R.V. coil. Check if CN721 is connected. Unit operates COOL mode even if it is set to HEAT mode. Disconnect connector (CN61) between the compressor and the intelligent power module. Turn ON the power supply and press EMERGENCY OPERATION switch twice (HEAT mode). Is there 230 VAC between CN721 and on the inverter P.C. board 3 minutes after the power supply is turned ON? No Yes Replace the 4-way valve. Replace the inverter P.C. board. Unit operates HEAT mode even if it is set to COOL mode. Disconnect connector (CN61) between the compressor and the intelligent power module. Turn ON the power supply and press EMERGENCY OPERATION switch once (COOL mode). Is there 230 VAC between CN721 and on the inverter P.C. board 3 minutes after the power supply is turned ON? Yes No Replace the 4-way valve. Replace the inverter P.C. board. 25 Outdoor fan motor does not operate. I Check of outdoor fan motor 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 outdoor fan motor. No Yes Replace the inverter P.C. board. Inverter does not operate. J Check of power supply Disconnect the connector (CN61) between compressor and intelligent power module. Turn ON power supply and press EMERGENCY OPERATION switch. Does POWER lamp on the indoor unit light up? Yes Is there voltage 280 ~ 370 VDC between DB61 (+) and DB61 (–) on the inverter P.C. board? (Refer to 10-6.1.) No Check the electric parts in main circuit. No Yes Rectify indoor/ outdoor connecting wire. Yes Is there voltage 208 / 230 VAC between the indoor terminal block S1 and S2? No Dose LED on the inverter P.C. board light up or fl ash? (Refer to 10-6.1.) No Yes If light up, OK. Replace the indoor electronic control P.C. board. Replace the inverter P.C. board. 280 ~ 370 VDC If fl ash, refer to 10-3. DB61 Inverter P.C. board (Solder side) 26 Heating/Cooling does not work sufficiently. K Check of LEV (Expansion valve) Turn ON the power supply. 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 ection 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 Expansion valve operates in full-opening direction. Do you hear the expansion valve "click, 1. Regardless of normal or abnormal condition, a short beep is emitted once the signal is received. click·······"? Do you feel the expansion valve vibrate on touching it ? No Yes OK. Is LEV coil properly fi xed to the expansion valve? Yes Does the resistance of LEV coil have the characteristics? (Refer to 10-4.) No Replace the LEV coil. No Yes 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. Yes Replace the expansion valve. No Replace the inverter P.C. board. 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. 27 Outdoor fan motor does not operate, or stops immediately after starting up. L Check of inverter P.C. board Check the outdoor fan motor. (Refer to10-5. .) Is the fuse (F901) blown on the in verter P.C. board? No Check the connection of the connectors (CN932) of the outdoor fan motor. If the connection is poor, make it correct. Operate the outdoor unit by starting EMERGENCY OPERATION. Check the LED indication on the in verter P.C. board. Does the LED fl ash 10-time? Yes (10-time fl ash) Replace the inverter P.C. board. Yes No Inverter P.C. board (Solder side) CN932 Check the corresponding parts following LED indication. (Refer to 10-3.) 28 • Unit cannot operate neither by the remote controller nor by EMERGENCY OPERATION switch. Indoor unit does not operate. • POWER lamp flashes ON and OFF in every 0.5 seconds. Outdoor unit doesn't operate. M How to check miswiring and serial signal error (outdoor unit does not work) Turn OFF the power supply. Is there rated voltage in the power supply? Yes Turn ON the power supply. Is there rated voltage between outdoor terminal block S1 and No Check the power supply. S2? No Check the wiring. Yes Press EMERGENCY OPERATION switch once. Does AREA-L lamp light up? Yes Is serial signal error indicated 6 minutes later? Yes A Turn OFF the power supply. No No Is there any miswiring, poor contact, or wire disconnection of the indoor/outdoor connect ing wire? No Yes Correct them. B 1. Miswiring may damage indoor electronic control P.C. Check once more if the indoor/outdoor connecting wire is not miswiring. Short-circuit outdoor terminal block S2 and S3. 1 Turn ON the power supply. Does the LED on the inverter P.C. board or the outdoor electronic control P.C. board board during the operation. Be sure to confi rm the wiring is correct before the opera tion starts. 3. Be sure to check this within 3 minutes after turning ON. After 3 minutes, LED blinks 6 times. Even when the inverter P.C. board or the outdoor electronic control P.C. board is normal, LED blinks 6 times after 3 minutes. Replace the inverter P.C. board or the out door electronic control P.C. board. repeat "3.6-second-OFF and 0.8-second ON quick blinking"? 3 Yes Turn OFF the power supply. No (Lighted or not lighted) 2 2. Be careful to the residual voltage of smoothing capacitor. Remove the short-circuit between outdoor terminal block S2 and S3. A Turn ON the power supply. No Is there any error of the in door/outdoor connecting wire, such as the damage of the wire, Yes Replace the indoor/ outdoor connecting wire. Turn OFF inverter-controlled lighting • equipment. Turn OFF the power supply and then • turn ON again. Press EMERGENCY OPERATION • switch. Is there amplitude of 10 to 20 VDC between outdoor terminal block S2 and S3? Yes intermediate connection, poor contact to the terminal block? No Is there any error of the in Is serial signal error indicated 6 minutes later? • • No Reinstall either the unit or the light each other away. Attach a fi lter on remote Is there rated voltage between indoor terminal block S1 and S2? Yes No door/outdoor connecting wire, such as the damage of the wire, intermediate connection, poor contact to the terminal block? No Yes Replace the indoor/ outdoor connecting wire. Yes B control receiv ing section of the indoor unit. Replace the indoor electronic control P.C. board. Be sure to release the failure-mode recall function after checking. 29 N Electromagnetic noise enters into TV sets or radios Is the unit grounded? No Ground the unit. Yes Is the distance between the antennas and the indoor unit within 9.91 ft., or is the distance between the antennas and the outdoor unit within 9.91 ft.? No Is the distance between the TV sets or radios and the indoor unit within 3.28 ft., or is the distance between the TV sets or radios and the outdoor unit within 9.91 ft.? No Are the antennas damaged? Is the coaxial cable damaged? Is there any poor contact in the anten Yes Yes Extend the distance between the antennas and the indoor unit, and/or the antennas and the outdoor unit. Extend the distance between the TV sets and/or radios and the indoor unit, or the TV sets or radios and the outdoor unit. Replace or repair the antenna. Replace or repair the coaxial cable. na wiring?Yes No Is the indoor/outdoor connecting wire of the air conditioner and the wiring of the antennas close? Yes No Extend the distance between the indoor/outdoor connecting wire of the air conditioner and the wir ing of the antennas. Even if all of the above conditions are fulfi lled, the electromagnetic noise may enter, depending on the electric fi eld strength or the installation condition (combination of specifi c conditions such as antennas or wiring). Check the followings before asking for service. 1. Devices affected by the electromagnetic noise TV sets, radios (FM/AM broadcast, shortwave) 2. Channel, frequency, broadcast station affected by the electromagnetic noise 3. Channel, frequency, broadcast station unaffected by the electromagnetic noise 4. Layout of ; indoor/outdoor unit of the air conditioner, indoor/outdoor wiring, grounding wire, antennas, wiring from antennas, receiver 5. Electric fi eld intensity of the broadcast station affected by the electromagnetic noise 6. Presence or absence of amplifi er such as booster 7. Operation condition of air conditioner when the electromagnetic noise enters in 1) Turn OFF the power supply once, and then turn ON the power supply. In this situation, check for the electromagnetic noise. 2) Within 3 minutes after turning ON the power supply, press OPERATE/STOP (ON/OFF) button on the remote controller for power ON, and check for the electromagnetic noise. 3) After a short time (3 minutes later after turning ON), the outdoor unit starts running. During operation, check for the elec tromagnetic noise. 4) Press OPERATE/STOP (ON/OFF) button on the remote controller for power OFF, when the outdoor unit stops but the indoor/outdoor communication still runs on. In this situation, check for the electromagnetic noise. 30 10-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MUZ-FD09NA MUZ-FD12NA Smoothing Smoothing Smoothing Back side of unit DB61 DC260 ~300 V (-) (+) capacitor (C63) capacitor (C62) Fuse(F801) capacitor (C61) Fuse(F701) 250 V 3.15 A AC 208 / 230 V Fuse(F901) 250 V 3.15 A Output to drive com pressor (LDU, LDV, LDW) 250 V 3.15 A R.V.coil (CN721) 208 / 230 VAC AC208/230 V Front side of unit r o o dt u o e v ir d o t tu pt u O ) 239 N C ( r o to m n a f e r u t a r e p m e t n iF 4 6 T R/ r o t s i m r e ht ) 246 N C( r e gn a hc x e ta e h r o o dt u O r o t s i m r e ht e r u t a r e p m e t ) 446 N C( 86 T R/ e r u t a r e p m e t tn e ib m A 5 6 T R/ r o t s i m r e ht ) 346 N C( r o t s i m r e ht ts o r fe D ) 14 6N C( 16 T R/ e r u t a r e p m e t e gr a hc s iD 2 6 T R/ r o t s i m r e ht ) 146 N C( LEV connector (CN724) Jumper wire for changing defrost setting (JS) Jumper wire for pre-heat control setting (JK) ) Ω k( e c n a t s is Defrost thermistor(RT61) Ambient temperature thermistor(RT65) Outdoor heat exchanger temperature thermistor(RT68) 200 100 180 90 160 80 Discharge temperature thermistor(RT62) 700 140 70 ) 600 120 60 Ω k ( ) 500 100 50 e Ω c k n ( 400 80 a 40 e t c s i n s a Fin temperature thermistor(RT64) e R 30 20 10 0 t s i s e R -4 14 32 50 68 86 104 Temperature(°F) 60 300 e R 40 200 20 100 0 0 32 50 68 86 104 122 140 158 176 194 212 230 248 Temperature(°F) 32 50 68 86 104 122 140 158 176 Temperature(°F) 31 11 DISASSEMBLY INSTRUCTIONS <"Terminal with locking mechanism" Detaching points> The terminal which has the locking mechanism can be detached as shown below. There are two types ( Refer to (1) and (2)) of the terminal with locking mechanism. The terminal without locking mechanism can be detached by pulling it out. Check the shape of the terminal before detaching. (1) Slide the sleeve and check if there is a locking lever or not. (2) The terminal with this connector has the locking mechanism. Sleeve Locking lever Slide the sleeve. Pull the terminal while pushing the locking lever. Hold the sleeve, and pull out the terminal slowly. Connector 11-1. MUZ-FD09NA MUZ-FD12NA NOTE : Turn OFF power supply before disassembling. OPERATING PROCEDURE PHOTOS 1. Removing the cabinet (1) Remove the screw fixing the service panel. (See Photo 1.) (2) Pull down the service panel and remove it. (See Photo 1.) (3) Remove the screws fixing the conduit cover. (See Photo 2.) (4) Remove the conduit cover. (See Photo 2.) (5) Disconnect the power supply wire and indoor/outdoor connecting wire. (6) Remove the screws fixing the top panel. (See Photo 1.) (7) Remove the top panel. (See Photo 1.) (8) Remove the screws fixing the cabinet. (9) Remove the cabinet. (10) Remove the screws fixing the back panel. (11) Remove the back panel. Photo 2 Screw of the conduit cover Photo 1 Screws of the top panel Screws of the cabinet Screw of the cabinet Screws of the top panel Service panel Back panel Screw of the service panel Hooks Conduit cover Conduit plate 32 32 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board (1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the lead wire to the reactor and the following connectors; CN721 (R.V.coil) CN932 (Fan motor) CN641 (Defrost thermistor and discharge temperature ther mistor) CN643 (Ambient temperature thermistor) CN644 (Outdoor heat exchanger temperature thermistor) CN724 (LEV) (3) Remove the compressor connector (CN61). (4) Remove the screws fixing the relay panel. (See Photo 3.) (5) Remove the inverter assembly. (See Photo 4.) (6) Remove the screw of the ground wire and screw of the T.B.support. (See Photo 4.) (7) Remove the inverter P.C. board from the inverter assembly. Photo 3 Screws of the relay panel 3. Removing R.V. coil (1) Remove the cabinet and panels. (Refer to 1.) (2) Remove the R.V. coil. (See Photo 5.) Photo 4 (inverter assembly) Heat sinkInverter P.C. board Screw of the T.B.support T.B.support 4. Removing the discharge temperature thermistor, defrost thermistor and outdoor heat exchanger tem perature thermistor. (1) Remove the cabinet and panels. (Refer to 1.) (2) Pull out the discharge temperature thermistor from its hold er. (See Photo 5.) (3) Pull out the defrost thermistor from its holder. (See Photo 6.) (4) Pull out the outdoor heat exchanger temperature thermistor from its holder. (See Photo 6.) Photo 5 Screw of the ground wire R.V. coil Discharge temperature thermistor 33 OPERATING PROCEDURE PHOTOS 5. Removing outdoor fan motor (1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the connectors for outdoor fan motor. (3) Remove the propeller nut. (See Photo 7.) (4) Remove the propeller. (See Photo 7.) (5) Remove the screws fixing the fan motor. (See Photo 7.) (6) Remove the fan motor. 6. Removing the compressor and 4-way valve (1) Remove the cabinet and panels. (Refer to 1.) (2) Remove the inverter assembly. (Refer to 2.) (3) Recover gas from the refrigerant circuit. NOTE: Recover gas from the pipes until the pressure Photo 6 Outdoor heat exchanger tempera ture thermistor Defrost thermistor gauge shows 0 PSIG. (4) Detach the welded part of the suction and the discharge pipe connected with compressor. (5) Remove the nuts of compressor legs. (6) Remove the compressor. (7) Detach the welded part of pipes connected with 4-way valve. (See Photo 8.) Photo 7 Screws of the outdoor fan motor Propeller Photo 8 Propeller nut Welded parts of 4-way valve 34 35 TM HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN Copyright 2008 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Jan. 2008. No. OBH498 7 Made in Japan New publication, effective Jan. 2008 Specifications subject to change without notice.