Instruction/ maintenance manual of the product MSZ-FD09NA Mitsubishi Electronics
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SER VICE MANUAL CONTENTS 1. TECHNICAL CHANGES ······································· 3 2. P ART NAMES AND FUNCTIONS ····················· 4 3. SPECIFICA TION ················································ 5 4.
2 Revision A: • 3. SPECIFICA TION has been corrected..
3 1 TECHNICAL CHANGES MSZ-FD09NA MSZ-FD12NA 1. New model..
4 4 P ART NAMES AND FUNCTIONS 2 MSZ-FD09NA MSZ-FD12NA i-see control operation i-see Sensor constantly measure floor/wall temperature to automatically adjust to the set temperature by estimating the temperature actually perceived by a person inside the room ("sensible temperature").
5 5 3 SPECIFICA TION Indoor model MSZ-FD09NA MSZ-FD12NA Power supply V , phase, Hz 208/230 , 1 , 60 Max. fuse size (time delay)/ Disconnect switch A1 5 Min.
6 6 3-2. OUTLET AIR SPEED AND COVERAGE RANGE ● The air coverage range is the figure up to the position where the air speed is 1 ft./sec., when air is blown out horizon- tally from the unit properly at the High speed position.
7 7 4 OUTLINES AND DIMENSIONS Unit : inch MSZ-FD09NA MSZ-FD12NA 30-7/8 31-3/8 1/2 1-7/8 2-3/16 11 - 5 / 8 27-1/16 3/4 2-5/16 6-1/4 1-1 1/16 2-1 1/16 2-3/16 3-15/16 1/2 10-1/8 1/4 Installation plate Pi.
8 5 WIRING DIAGRAM MSZ-FD09NA MSZ-FD12NA.
9 REFRIGERANT SYSTEM DIAGRAM 6 MSZ-FD09NA MSZ-FD12NA Refrigerant flow in cooling Refrigerant flow in heating Unit:inch Indoor heat exchanger Flared connection Room temperature thermistor RT1 1 Flared .
10 7 SER VICE FUNCTIONS 7-1. TIMER SHORT MODE For service, set time can be shortened by short circuit of JPG and JPS the indoor electronic control P .C. board. The time will be shortened as follows. (Refer to 9-7.) Set time : 1-minute 1-second Set time : 3-minute 3-second (It takes 3 minutes for the compressor to start operation.
11 NOTE: • The operation settings are memorized when 10 seconds have passed after the indoor unit was operated with the remote controller . • If main power is turned OFF or a power failure occurs while AUTO ST ART/ST OP timer is active, the timer setting is cancelled.
12 8 MICROPROCESSOR CONTROL WIRELESS REMOTE CONTROLLER MSZ-FD09NA MSZ-FD12NA ON TIMER button CLOCK SET button TIME SET buttons FORW ARD button BACKW ARD button OFF TIMER button RESET button V ANE CONT.
13 8-1. COOL ( ) OPERA TION (1) Press OPERA TE/ST OP (ON/OFF) button. POWER lamp of the indoor unit turns on with a beep tone. (2) Select COOL mode with OPERA TION SELECT button. (3) Press TEMPERA TURE buttons (TOO W ARM or TOO COOL button) to select the desired temperature.
14 8-4. AUTO CHANGE OVER ··· AUTO MODE OPERA TION Once desired temperature is set, unit operation is switched automatically between COOL and HEA T operation. Mode selection (1) Initial mode When unit starts the operation with AUTO operation from of f; • If the room temperature is higher than the set temperature, operation starts in COOL mode.
15 (3) Positioning T o confirm the standard position, the vane moves until it touches the vane stopper . Then the vane is set to the selected angle. Confirming of standard position is performed in the following cases: (a) The operation starts or finishes (including timer operation).
16 ( 10 ) POWERFUL ( ) operation. The air conditioner automatically adjusts the fan speed and the set temperature, and operates the POWERFUL mode. The POWERFUL mode is automatically released 15 minutes after operation starts, and the operation mode returns to the mode prior to POWERFUL operation 2.
17 8-6. i-see CONTROL OPERA TION The sensors constantly measure the room and floor/wall temperatures to automatically adjust to the set temperature by esti- mating the temperature actually perceived by a person inside the room (“sensory temperature”).
18 Indoor unit installation location and air-conditioning area ·Be sure to set the slide switch inside the remote controller to an appropriate position in accordance with the installed position of the indoor unit. If the switch is not set correctly , the air conditioner may not function properly .
19 Operation and operating range i-see sensor moves 30 degrees from the center in both right and left side. i-see Sensor operates as follows in accordance with AREA setting made with the remote controller .
20 8-8. TIMER OPERA TION 1. How to set the time (1) Check that the current time is set correctly . NOTE : T imer operation will not work without setting the current time. Initially “0:00 AM” blinks at the current time dis- play of TIME MONIT OR, so set the current time correctly with CLOCK SET button.
21 8-1 1. Changing temperature indication (°F/°C) 8-9. EMERGENCY/TEST OPERA TION In case of test run operation or emergency operation, use EMERGENCY OPERA TION switch on the right side of the indoor unit. Emergency operation is available when the remote controller is missing, has failed or the batteries of the remote controller run down.
22 9-1. CAUTIONS ON TROUBLESHOOTING 1. Before troubleshooting, check the following 1) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for miswiring.
23 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 (9-4.) 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 .
24 2. Indoor unit failure mode table POWER Abnormal point (Failure mode) Condition Correspondence Not lighted Normal — — 1-time fl ash every 0.5-second Room temperature thermistor The room temperature thermistor short or open circuit is detected every 8 seconds during op- eration.
25 9-3. INSTRUCTION OF TROUBLESHOOTING Indoor unit oper- ates. Outdoor unit doesn't operate. If blinking of OPERA TION INDI- CA T OR lamp cannot be checked, it can be checked with failure mode recall function. Indoor unit operates. Outdoor unit doesn't operate normally .
26 9-4. TROUBLESHOOTING CHECK T ABLE Before taking measures, make sure that the symptom reappears for accurate troubleshooting. When the indoor unit has started operation and the following detection method has detected an abnormality (the first detection after the power ON), the indoor electronic control P .
27 AREA R POWER L No. Abnormal point Operation indicator lamp Symptom Condition Correspondence 1 MXZ type Operation mode setting POWER lamp is lighted.
28 28 9-5. TROUBLE CRITERION OF MAIN P ARTS MSZ-FD09NA MSZ-FD12NA Part name Check method and criterion Figure Room temperature therm- istor (RT1 1) Indoor coil thermistor (RT12, R T13) Measure the resistance with a tester . Refer to 9-7. "T est point diagram and voltage", "Indoor electronic control P .
29 29 A Check of indoor fan motor 9-6. TROUBLESHOOTING FLOW The indoor fan motor error has occurred, and the indoor fan doesn't operate. T urn OFF the power supply . Is there any foreign matter that interferes the rotation of the line fl ow fan? Ye s No Remove the foreign matter and adjust the line fl ow fan.
30 30 B Check of remote controller and indoor electronic control P .C. board Check if the remote controller is exclusive for this air conditioner . Does the unit operate with the remote controller? OK Ye s No (Not clear) Replace the batteries. (Refer to 9-1.
31 31 C Check of indoor electronic control P .C. board and indoor fan motor T urn OFF the power supply . Remove indoor fan motor connector CN21 1, vane motor connector CN151 and the i-see Sensor motor connector CN1 10 from the indoor electronic control P .
32 32 D 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.
33 33 E 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.
34 MSZ-FD09NA MSZ-FD12NA Indoor electronic control P .C. board 9-7. TEST POINT DIAGRAM AND VOL T AGE Room temperature thermistor (RT1 1) Indoor coil thermistor (RT12, RT13) T emperature (°F) Resistance (k Ω ) 32 50 68 86 104 122 140 Release of Auto restart function Solder the Jumper wire JR07 (Refer to 7-3.
35 2. Power monitor receiver P .C. board 3. Monitor P .C. board.
36 MSZ-FD09NA MSZ-FD12NA NOTE : T urn OFF power supply before disassembling. OPERA TING PROCEDURE PHOTOS 1. Removing the panel (1) Hold both sides of the front panel and lift the front panel until it is level. Pull the hinges forward to remove the front panel.
37 OPERA TING PROCEDURE PHOTOS 2. Removing the electronic control P .C. board, the power monitor receiver P .C. board, i-see Sensor , SW P .C. board and the terminal block (1) Remove the panel (refer to 1.) and the corner box. (2) Remove the screw of the conduit cover .
38 OPERA TING PROCEDURE PHOTOS 3. Removing the electrical box (1) Remove the panel (Refer to 1.) and the corner box. (2) Remove the indoor/outdoor connecting wire, the sensor holder , the electrical cover and the ground wire. (Refer to 2.) (3) Disconnect the following connectors on the electronic con- trol P .
39 OPERA TING PROCEDURE PHOTOS 6. Removing the horizontal vane motor (1) Remove the nozzle assembly . (Refer to 4.) (2) Remove the screws of the horizontal vane motor unit, and pull out the horizontal vane motor unit. (3) Remove the screws of the horizontal vane motor unit cover .
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. OBH497 REVISED EDITION-A 7 Distributed in Jan. 2008. No. OBH497 7 Made in Japan New publication, effective Mar .
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