Mitsubishi Electronics MUZ-FD12NA manual

SER VICE MANUAL CONTENTS 1. TECHNICAL CHANGES ··································· 3 2. P ART NAMES AND FUNCTIONS ····················· 3 3. SPECIFICA TION ················································ 4 4. OUTLINES AND DIMENSIONS ······?[...]

2 Revision A: • 3. SPECIFICA TION has been corrected.[...]

3 3 1 TECHNICAL CHANGES MUZ-FD09NA MUZ-FD09NA - U1 MUZ-FD12NA MUZ-FD12NA - U1 1. New model P ART NAMES AND FUNCTIONS 2 MUZ-FD09NA MUZ-FD12NA Air outlet Drain outlet Piping Drain hose Air inlet[...]

4 4 3 SPECIFICA TION 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 12,500 13,600 Power consumption Rated (Minimum~Maximum) Cooling 1 W 650 (160~650) 960 (160~960) Heat[...]

5 5 T est condition ARI Mode T est Indoor air condition Outdoor air condition Dry bulb (°F) Wet bulb (°F) Dry bulb (°F) Wet bulb (°F) SEER (Cooling) "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) "B-1" Cooling Steady State at minim[...]

6 6 OUTLINES AND DIMENSIONS 4 Unit: inch MUZ-FD09NA MUZ-FD12NA Liquid pipe :1/4 (flared) Gas pipe :3/8 (flared) 6-23/32 2 5-7/8 2-23/32 1-3/4 15-3/4 12 ~ 12-3/4 13-9/16 11 / 1 6 1-9/16 7/8 21-5/8 1 1-1/32 13/32 31-1/2 19-1 1/16 5-15/16 1 1-29/32 17/32 29/32 1 1-1/4 Air in handle Air in Air out 2- 3/8 13/16 Oval hole Drain hole 1-5/8 REQUIRED SP ACE[...]

7 7 5 WIRING DIAGRAM MUZ-FD09NA MUZ-FD12NA[...]

8 6 REFRIGERANT SYSTEM DIAGRAM Unit:inch MUZ-FD09NA MUZ-FD12NA Outdoor heat exchanger Flared connection Defrost thermistor RT6 1 Discharge temperature thermistor RT6 2 Service port Service port Flared connection Stop valve (with strainer) Stop valve (with service port) Refrigerant flow in cooling Compressor 4-way valve Refrigerant flow in heating R[...]

9 D ATA 7 MUZ-FD09NA MUZ-FD12NA 7-1. PERFORMANCE DA T A 1) COOLING CAP ACITY Model Indoor air Outdoor intake air DB temperature ( ˚ F) IWB 75 85 95 105 1 15 ( ˚ F) TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC MUZ-FD09NA 71 1 1.0 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 [...]

10 10 7-2. PERFORMANCE CURVE 65 70 75 75 70 65 12 10 6 8 Indoor intake air DB tem perat ure (°F) = 381 CFM Airflow 15 25 35 45 55 Outdoor intake air WB temperature (°F) 0.4 0.6 0.8 Indoor intak e air DB temperat ure (°F ) T otal power consumption (kW) T otal capacity (1 0 3 Btu/h) 65 70 75 75 70 65 20 18 16 14 8 6 12 10 1.1 0.6 Indoor intake air[...]

11 11 7-3. CONDENSING PRESSURE Cooling Data is based on the condition of indoor humidity 50 %. Air flow should be set to High speed. MUZ-FD12NA (PSIG) Condensing pressure 86 80 75 70 68 70 75 80 85 90 95 100 105(°F) 120 125 130 135 140 145 150 155 160 165 170 175 180 Suction pressure Outdoor ambient temperature Indoor DB temperature (°F) (PSIG) 8[...]

75 70 65 (PSIG) (PSIG) Condensing pressure Outdoor ambient temperature 14 20 25 30 35 40 45 50 55 60 65 70 (°F) 220 200 180 160 140 240 260 280 320 300 340 360 380 400 Ind oor DB tem perat ure( °F) 75 70 65 Suction pressure Outdoor ambient temperature 14 20 25 30 35 40 45 50 55 58Hz 58Hz 60 65 70(°F) 80 70 60 90 100 11 0 120 130 140 150 160 170 [...]

13 13 7-4. ST ANDARD OPERA TION DA T A Model MSZ-FD09NA MSZ-FD12NA Item Unit Cooling Heating Cooling Heating T otal Capacity Btu/h 9,000 10,900 12,000 13,600 SHF — 0.76 — 0.73 — Input kW 0.650 0.750 0.960 0.980 Rated frequency Hz 35 43 51 54 Electrical circuit Indoor unit MSZ-FD09NA MSZ-FD12NA Power supply V, phase, Hz 208/230 , 1 , 60 Input [...]

14 7-5. CAP ACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY Capacity correction factors Input correction factors Input correction factors Capacity correction factors Correction of Cooling capacity The operational frequency of compressor Correction of Cooling total input The operational frequency of compressor Correction of Heating total inp[...]

15 15 8 ACTUA TOR CONTROL MUZ-FD09NA MUZ-FD12NA 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 ON OFF Outdoor fan motor Compressor 5 second[...]

16 SER VICE FUNCTIONS 9 9-1. CHANGE IN DEFROST SETTING Changing defrost finish temperature <JS> T o 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 JS Soldered (Initial setting) 41°F (5°C) None (Cut) 50°F (10°C) MUZ-FD09V A MUZ-FD12V [...]

17 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 [...]

18 Does POWER lamp 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. 2 Ye s (Blinks ) No (OFF) The outdoor unit might be abnormal. Con fi rm if outdoor unit is abnormal according to the following procedures. Operational procedure Con fi [...]

19 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 Outdoor power system ?[...]

20 10-3. TROUBLESHOOTING CHECK T ABLE No. Symptom LED indication Abnormal point/ Condition Condition Correspondence 1 Outdoor unit does not oper- ate. 1-time fl ash every 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 compr[...]

21 No. Symptom LED indication Abnormal point/ Condition Condition Correspondence 18 Outdoor unit operates. 7-time fl ash 2.5 seconds OFF Low discharge tem- perature protection T emperature of discharge temperature thermistor has been 122°F (50°C) or less for 20 minutes. Refer to 10-5. "Check of LEV". Check refrigerant circuit and refri[...]

22 10-4. TROUBLE CRITERION OF MAIN P ARTS 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) Measure the resistance with a tester . Refer to 10-6. “T est point diagram and voltage”, 1. “Inverter P .C. board”,[...]

23 10-5. TROUBLESHOOTING FLOW Are the voltages balanced? Disconnect the connector (CN61) between compressor and the intelligent power module (IPM). Replace the inverter P .C. board. Check the voltage between terminals. Check the compressor . See 10-5. “Check of compressor”. No Ye s See 10-5. “Check of open phase”. ● With the connector bet[...]

24 F Check of compressor start failure D Check of compressor winding E Check of compressor operation time ● Disconnect the connector (CN61) between the compressor and intelligent power module, and measure the resistance between the compressor terminals. <<Measurement point>> at 3 points BLK-WHT BLK-RED WHT -RED <<Judgement>&g[...]

25 Is the thermistor normal? (Refer to 10-6.1.) Reconnect the connector of thermistor . T urn ON the power supply and press EMERGENCY OPERA TION switch. No Replace the thermistor except RT64. When R T64 is abnormal, replace the inverter P .C. board. Does the unit operate for 10 minutes or more without showing thermistor abnormality? OK. (Cause is p[...]

26 I Check of outdoor fan motor J Check of power supply Is the outdoor fan motor normal? (Refer to 10-4.) Replace the outdoor fan motor . Disconnect CN932 from the inverter P .C. board, and measure the resistance of the outdoor fan motor . Replace the inverter P .C. board. No Ye s Is there voltage 208/230 V AC between the indoor terminal block S1 a[...]

27 Press OPERA TE/ST OP (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. OK. NOTE : After check of LEV , do the undermentioned operations. 1. T urn OFF the power supply and turn ON it again. 2. Press RESET butt[...]

28 Check the outdoor fan motor . (Refer to10-5. .) Is the fuse (F901) blown on the in- verter P .C. board? 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 OPERA TION. Check the LED indication on the in- verter P .C. board. Does the [...]

29 M How to check miswiring and serial signal error T urn OFF the power supply . Is there rated voltage in the power supply? Ye s No T urn ON the power supply . Check the power supply . Is there rated voltage between outdoor terminal block S1 and S2? No Check the wiring. Press EMERGENCY OPERA TION switch once. Does AREA-L lamp light up? <Con fi[...]

30 N Electromagnetic noise enters into TV sets or radios Ye s Is the unit grounded? No Ground the unit. Ye s 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 Extend the distance between the antennas and the indoor unit, and/or the antennas and [...]

31 10-6. TEST POINT DIAGRAM AND VOL T AGE -4 14 32 50 68 86 104 0 10 20 30 40 50 60 70 80 90 100 T emperature(°F) Defrost thermistor(RT61) Ambient temperature thermistor(RT65) Outdoor heat exchanger temperature thermistor(RT68) T emperature(°F) Discharge temperature thermistor(RT62) 32 50 68 86 104 122 140 158 176 194 212 230 248 0 100 200 300 40[...]

32 1 1-1. MUZ-FD09NA MUZ-FD12NA NOTE : T urn OFF power supply before disassembling. OPERA TING 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 cov[...]

33 OPERA TING PROCEDURE PHOT OS 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; <Inverter P .C. board> CN721 (R.V .coil) CN932 (Fan motor) CN641 (Defrost thermistor and discharge temperature ther- mistor) CN643 ([...]

34 OPERA TING PROCEDURE PHOT OS 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[...]

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HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAP AN Copyright 2008 MITSUBISHI ELECTRIC ENGINEERING CO.,L TD Distributed in Mar . 2008. No. OBH498 REVISED EDITION-A 7 Distributed in Jan. 2008. No. OBH498 7 Made in Japan New publication, effective Mar . 2008 Specifications subject to change without notice. TM[...]