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Mitsubishi Electronics MUZ-FD12NA - page 1
SER VICE MANUAL CONTENTS 1. TECHNICAL CHANGES ··································· 3 2. P ART NAMES AND FUNCTIONS ····················· 3 3. SPECIFICA TION ················································ 4 4. OUTLINES AND DIMENSIONS ······? ...
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Mitsubishi Electronics MUZ-FD12NA - page 2
2 Revision A: • 3. SPECIFICA TION has been corrected. Revision B: • 7. DA T A has been corrected. ...
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Mitsubishi Electronics MUZ-FD12NA - page 3
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 ...
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Mitsubishi Electronics MUZ-FD12NA - page 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) Heatin ...
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Mitsubishi Electronics MUZ-FD12NA - page 5
5 T est condition ARI Mode T est Indoor air condition (°F) Outdoor air condition (°F) Dry bulb Wet bulb Dry bulb Wet bulb 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 minimum compressor ...
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Mitsubishi Electronics MUZ-FD12NA - page 6
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 ...
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Mitsubishi Electronics MUZ-FD12NA - page 7
7 7 5 WIRING DIAGRAM MUZ-FD09NA MUZ-FD12NA ...
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Mitsubishi Electronics MUZ-FD12NA - page 8
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 ...
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Mitsubishi Electronics MUZ-FD12NA - page 9
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 ( ˚ F) 75 85 95 105 1 15 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 ...
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Mitsubishi Electronics MUZ-FD12NA - page 10
10 10 7-2. PERFORMANCE CURVE 65 70 75 75 70 65 12 10 6 4 8 Indoor intake air DB tem perat ure (°F) = 381 CFM Airflow 15 52 5 3 5 4 5 5 5 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 18 16 14 8 6 12 10 0.6 0.5 Indoor intake ...
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Mitsubishi Electronics MUZ-FD12NA - page 11
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 ...
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Mitsubishi Electronics MUZ-FD12NA - page 12
75 70 65 (PSIG) (PSIG) Condensing pressure Outdoor ambient temperature 15 5 1 0 2 02 53 03 54 04 55 05 56 06 5 7 0 (°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 15 20 5 1 0 2 53 03 54 04 55 05 5 58Hz 58Hz 60 65 70(°F) 80 70 60 50 90 100 11 0 120 13 ...
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Mitsubishi Electronics MUZ-FD12NA - page 13
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 ...
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Mitsubishi Electronics MUZ-FD12NA - page 14
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 ...
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Mitsubishi Electronics MUZ-FD12NA - page 15
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 ...
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Mitsubishi Electronics MUZ-FD12NA - page 16
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 ...
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Mitsubishi Electronics MUZ-FD12NA - page 17
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. 10-2. F AILURE MODE RECALL FUNCTION 1. Flow chart of failure mode recall function for the indoor/outdoor ...
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Mitsubishi Electronics MUZ-FD12NA - page 18
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 ...
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Mitsubishi Electronics MUZ-FD12NA - page 19
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 ? ...
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Mitsubishi Electronics MUZ-FD12NA - page 20
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 ...
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Mitsubishi Electronics MUZ-FD12NA - page 21
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 ...
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Mitsubishi Electronics MUZ-FD12NA - page 22
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”, ...
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Mitsubishi Electronics MUZ-FD12NA - page 23
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 ...
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Mitsubishi Electronics MUZ-FD12NA - page 24
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 be- tween the compressor terminals. <<Measurement point>> at 3 points BLK - WHT BLK - RED WHT - RED <<Judgemen ...
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Mitsubishi Electronics MUZ-FD12NA - page 25
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 ...
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Mitsubishi Electronics MUZ-FD12NA - page 26
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 ...
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Mitsubishi Electronics MUZ-FD12NA - page 27
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 ...
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Mitsubishi Electronics MUZ-FD12NA - page 28
28 Check the outdoor fan motor . (Refer to 10-5. .) 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 ...
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Mitsubishi Electronics MUZ-FD12NA - page 29
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 ...
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Mitsubishi Electronics MUZ-FD12NA - page 30
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 ...
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Mitsubishi Electronics MUZ-FD12NA - page 31
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 ...
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Mitsubishi Electronics MUZ-FD12NA - page 32
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 ...
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Mitsubishi Electronics MUZ-FD12NA - page 33
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 ( ...
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Mitsubishi Electronics MUZ-FD12NA - page 34
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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Mitsubishi Electronics MUZ-FD12NA - page 35
35 ...
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Mitsubishi Electronics MUZ-FD12NA - page 36
HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAP AN © Copyright 2008 MITSUBISHI ELECTRIC CO.,L TD Distributed in Nov . 2008. No. OBH498 REVISED EDITION-B 5 Distributed in Mar . 2008. No. OBH498 REVISED EDITION-A 7 Distributed in Jan. 2008. No. OBH498 7 Made in Japan New publication, effective Nov . 2008 Specifications s ...
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