Service manual

ManualsBrandsMitsubishi ManualsAir ConditionerMXZ-A26

SERVICE MANUAL

CONTENTS

1. TECHNICAL CHANGES ····································3

2. PART NAMES AND FUNCTIONS······················3

3. SPECIFICATION·················································5

4. NOISE CRITERIA CURVES·······························6

5. OUTLINES AND DIMENSIONS ·························7

6. WIRING DIAGRAM ············································8

7. REFRIGERANT SYSTEM DIAGRAM················8

8. MICROPROCESSOR CONTROL ······················9

9. SERVICE FUNCTIONS ····································17

10. TROUBLESHOOTING······································19

11. DISASSEMBLY INSTRUCTIONS·····················26

12. PARTS LIST······················································28

Wireless type

Models

MSC-A07YV -

(WH)

MSC-A09YV -

(WH)

MSC-A12YV -

(WH)

MSC-A07YV -

MSC-A09YV -

MSC-A12YV -

No. OB329

HFC

utilized

R410A

SPLIT-TYPE, AIR CONDITIONERS

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

Indication of model name

NOTE:

•This manual describes technical data of indoor units.

•As for outdoor units MU-A07/A09/A12YV - , refer to the service manual OB330.

•As for outdoor units MUH-A07/A09/A12YV - , refer to the service manual OB331.

•As for outdoor units MUX-A10/A19/A20/A25/A26WV - , refer to the service manual OB307 REVISED

EDITION-A.

•As for outdoor units MUX-A22WV - , refer to the service manual OB318.

•As for outdoor units MXZ-A18/A26/A32WV - , refer to the service manual OB319.

OB329-1.qxp 03.12.3 1:16 PM Page 1

Summary of content (32 pages)

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OB329-1.qxp 03.12.3 1:16 PM Page 1 SPLIT-TYPE, AIR CONDITIONERS SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS HFC No. OB329 utilized SERVICE MANUAL R410A Wireless type Models MSC-A07YV MSC-A09YV MSC-A12YV - E1 (WH) E1 (WH) E1 (WH) CONTENTS Indication of model name MSC-A07YV MSC-A09YV MSC-A12YV - E1 E1 E1 1. TECHNICAL CHANGES ····································3 2. PART NAMES AND FUNCTIONS······················3 3. SPECIFICATION·················································5 4.
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OB329-1.qxp 03.12.
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OB329-1.qxp 03.12.3 1:16 PM 1 Page 3 TECHNICAL CHANGES MSC-A07WV- E1 ➔MSC-A07YV- E1 MSC-A09WV- E1 ➔MSC-A09YV- E1 MSC-A12WV- E1 ➔MSC-A12YV- E1 1. Design of front panel has changed. 2. Air filter has changed to the catechin air filter.
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OB329-1.qxp 03.12.3 1:16 PM Page 4 MSC-A07YV- E1 MSC-A09YV- E1 MSC-A12YV- E1 ACCESSORIES 1 Installation plate 1 2 Installation plate fixing screw 4 o 25 mm 5 3 Remote controller holder 1 4 Fixing screw for 3 3.
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03.12.3 1:16 PM 3 Page 5 SPECIFICATION Indoor model Function Indoor unit power supply Fan motor Electrical data Capacity Air flow(High/Med.w/Low w) Power outlet Running current Power input Power factor Fan motor current Model Winding resistance(at 20:) Dimensions WOHOD Weight Air direction Sound level(High/Med.w/Loww ) Fan speed(High/Med.w/Loww ) Fan speed regulator Thermistor RT11(at 25:) Thermistor RT12(at 25:) Remote controller model Special remarks OB329-1.
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OB329-1.qxp 03.12.
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03.12.3 1:16 PM 5 Page 7 OUTLINES AND DIMENSIONS MSC-A07YV - E1 MSC-A09YV - E1 Unit: mm 4.5 133.5 231.5 Installation plate INDOOR UNIT Indoor unit 271 81.5 81.5 326 42 41 2.5 783 81.5 326 Wall hole [65 242 Air in 58 { 30 19 110 Air out Power supply cord Lead to right 1.0m Lead to left 0.3m 162 Installation plate Liquid line [6.35-0.5m Gas line [9.52-0.43m Insulation [37 O.D [21 I.
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OB329-1.qxp 03.12.3 1:16 PM 6 Page 8 WIRING DIAGRAM MSC-A07YV - E1 MSC-A09YV - E1 MSC-A12YV - E1 MODELS WIRING DIAGRAM INDOOR UNIT TO OUTDOOR TB UNIT L CONNECTING BRN FOR 3 MUH OR MXZ TYPE N 12V FOR MU OR MUX TYPE 12V BRN RED BLU BLU 2 WHT 1 BLK GRN CIRCUIT BREAKER NAME SYMBOL RT12 CN201 3 2 1 CN202 2 1 CN 111 RT11 T11 NR11 CN 121 1 3 5 C11 F11 SR141 3 BLK GRY YLW BRN WHT RED CN211 MV 5 POWER MONITOR, RECEIVER P.C.
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OB329-1.qxp 03.12.3 1:16 PM 8 Page 9 MICROPROCESSOR CONTROL MSC-A07YV - E1 MSC-A09YV - E1 MSC-A12YV - E1 Once the operation mode are set, the same operation mode can be repeated by simply turning the OPERATE/STOP (ON/OFF) button ON. Indoor unit receives the signal with a beep tone. When the system turns off, 3-minute time delay will operate to protect system from overload and compressor will not restart for 3 minutes.
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OB329-1.qxp 03.12.3 1:16 PM Page 10 3. Coil frost prevention ① Temperature control When the indoor coil thermistor RT12 reads 4°C or below(MSC-A07/A09YV) / 0°C or below(MSC-A12YV) for 5 minutes, the coil frost prevention mode starts. The indoor fan operates at the set speed and the compressor stops for 5 minutes. After that, if RT12 still reads below 4°C (MSC-A07/A09YV) / 0°C (MSC-A12YV), this mode is prolonged until the RT12 reads over 4°C (MSC-A07/A09YV) / 0°C (MSC-A12YV).
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OB329-1.qxp 03.12.3 1:16 PM Page 11 Operation time chart Example Thermostat ON ON OFF OFF ON ON Indoor fan OFF Outdoor fan Compressor OFF OFF ON ON ON OFF OFF ON 8 min. OFF 3 min. 4 min. 1 min. 4. Coil frost prevention The operation is as same as coil frost prevention during COOL operation.(Refer to 8-1.3.) However when coil frost prevention works while the indoor fan is OFF, its speed becomes set speed. 8-3.
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OB329-1.qxp 03.12.3 1:16 PM Page 12 (3) Warm air control. When the following any condition of 1 (a. ~ c.) and the condition of 2 are satisfied at the same time, warm air control works. 1 a.) When outdoor unit starts operating in HEAT mode. b.) When cold air prevention has been released. c.) When defrosting has been finished 2 When the temperature of indoor coil thermistor RT12 is less than 37°C. When warm air control works, the fan speed changes as follows to blow out warm air gradually.
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OB329-1.qxp 03.12.3 1:16 PM Page 13 (4) The initial set temperature is decided by the initial room temperature.
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OB329-1.qxp 03.12.3 1:16 PM Page 14 8-6. FAN MOTOR CONTROL (1) Rotational frequency feedback control The indoor fan motor is equipped with a rotational frequency sensor, and outputs signal to the microprocessor to feedback the rotational frequency. Comparing the current rotational frequency with the target rotational frequency (High,Med.,Low), the microprocessor controls SR141 and adjusts fan motor electric current to make the current rotational frequency close to the target rotational frequency.
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OB329-1.qxp 03.12.3 1:16 PM Page 15 (7) Cold air prevention in HEAT operation When any of the following conditions occurs in HEAT operation, the horizontal vane angle changes to Angle 1 automatically to prevent cold air blowing on users. ① Compressor is not operating. ➁ Defrosting is performed. ➂ Indoor coil thermistor RT12 reads 24: or below. ➃ Indoor coil thermistor RT12 temperature is raising from 24°C or below, but it does not exceed 28:.
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OB329-1.qxp 03.12.3 1:16 PM Page 16 (4) Press HR. and MIN. button to set the timer. Time setting is 10-minute units. HR. and MIN. button will work when “ ” or “ ” mark is flashing. These marks disappear in 1 minute. After setting the ON timer, check that OPERATION INDICATOR lamp of the indoor unit lights.
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OB329-1.qxp 03.12.3 1:16 PM 9 Page 17 SERVICE FUNCTIONS MSC-A07YV - E1 MSC-A09YV - E1 MSC-A12YV - E1 9-1. TIMER SHORT MODE For service, set time can be shortened by short circuit of JPG and JPS the electronic control P.C. board. The time will be shortened as follows. (Refer to page 25.) Set time : 1 minute ➔ 1-second Set time : 3 minutes ➔ 3-second (It takes 3 minutes for the compressor to start operation. However, the starting time is shortened by short circuit of JPG and JPS.) 9-2. P.C.
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OB329-1.qxp 03.12.3 1:16 PM Page 18 9-3. REMOTE CONTROLLER (How to set the type) This remote controller setting needs to be switched according to the type of air conditioner (COOL & HEAT or COOL ONLY). If the setting is incorrect, the air conditioner does not operate normally. Therefore, check if the setting corresponds to the type of air conditioner. If not, correct the setting as shown below. Slide switch Type COOL & HEAT COOL ONLY The position of the slide switch 9-4.
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OB329-1.qxp 03.12.3 1:16 PM 10 Page 19 TROUBLESHOOTING MSC-A07YV - E1 MSC-A09YV - E1 MSC-A12YV - E1 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 mis-wiring. 2. Take care the following during servicing.
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OB329-1.qxp 03.12.3 1:16 PM Page 20 10-2. Instruction of troubleshooting MSC-A07YV - E1 MSC-A09YV - E1 MSC-A12YV - E1 Start Indoor unit operates. Outdoor unit doesn't operate normally. Indoor unit operates. Outdoor unit doesn't operate. Outdoor unit operates in only Test Run operation. Outdoor unit doesn't operate even in Test Run operation. Check room temperature thermistor. Refer to "Test point diagram and voltage" on page 25.
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OB329-1.qxp 03.12.3 1:16 PM Page 21 10-3. Troubleshooting check table • The following indication does not depend on the shape of lamp. flashing Operation Indicator · Flashing of the OPERATION INDICATOR lamp (on the left-hand side) indicates possible abnormalities. · The OPERATION INDICATOR lamp (on the left-hand side) is lighting during normal operation. ❈ Before taking measures, make sure that the symptom reappears, for accurate troubleshooting. Self check table No.
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OB329-1.qxp 03.12.3 1:16 PM Page 22 10-4. Trouble criterion of main parts MSC-A07YV - E1 MSC-A09YV - E1 MSC-A12YV - E1 Figure Check method and criterion Part name Room temperature thermistor (RT11) Measure the resistance with a tester.
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OB329-1.qxp 03.12.3 1:16 PM Page 23 Indoor unit operates by pressing the EMERGENCY OPERATION switch, but doesn’t operate with the remote controller. B Check of remote controller and receiver P.C. board wCheck the remote controller is exclusive for this air conditioner. Switch on the remote controller. Is LCD display on the remote controller displayed? No Replace the batteries. (Refer to page 19.) (not clear) Yes Remove batteries, then set them back and press the RESET button.
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OB329-1.qxp 03.12.3 1:16 PM Page 24 When OPERATION INDICATOR lamp flashes 0.5-second intervals or 1-time. Outdoor unit does not operate. D How to check mis-wiring and serial signal error w 1 Set the switch(SW2-2) on indoor electronic control P.C. board to MU or MUX type, when the outdoor unit is MU or MUX type. If the setting is MUH or MXZ type, the unit does not work. Start w 2 Short circuit of JPG and JPS on the indoor electronic control P.C.
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03.12.3 1:16 PM Page 25 TEST POINT DIAGRAM AND VOLTAGE MSC-A07YV - E1 MSC-A09YV - E1 MSC-A12YV - E1 Indoor electronic control P.C. board Fuse 250V AC 3.15A } Indoor fan motor 230 V AC Varistor (NR11) 12V DC { +-- } Power supply input 230 V AC R132 Indoor coil thermistor (RT12) Room temperature thermistor (RT11) } Timer short mode point JPG, JPS (Refer to page 17.) Emergency operation switch SW2 (Refer to page 18.) 1 sets the Auto restart function ON/ OFF.
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OB329-1.qxp 11 03.12.3 1:16 PM Page 26 DISASSEMBLY INSTRUCTIONS <"Terminal with lock mechanism" Detaching points> In case of terminal with lock mechanism, detach the terminal as shown below. There are two types ( Refer to (1) and (2)) of the terminal with lock mechanism. The terminal with no lock mechanism can be removed by pulling it out. Check the shape of the terminal and work. (1) Slide the sleeve and check if there is a locking lever or not.
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OB329-1.qxp 03.12.3 1:16 PM Page 27 OPERATING PROCEDURE PHOTOS 3. Removing the electrical box (1) (2) (3) (4) (5) (6) (7) Remove the front panel. (Refer to 1.) Remove the electrical cover. (Refer to 2.) Remove the V.A. clamp. (Refer to 2.) Remove the cord clamp. (Refer to 2.) Remove the terminal block. (Refer to 2.) Remove the screw of ground wire. (Refer to 2.
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OB329-1.qxp 03.12.3 1:16 PM 12 Page 28 PARTS LIST MSC-A07YV - E1 (WH) MSC-A09YV - E1 (WH) MSC-A12YV - E1 (WH) 12-2. ACCESSORY AND REMOTE CONTROLLER 12-1. INDOOR UNIT STRUCTURAL PARTS 1 (W) 11 10 9 (W) 8 2 3 7 (See page 30.) 4 5 6 (W) (W) These figures show about MSC-A12YV. 12-1. INDOOR UNIT STRUCTURAL PARTS Symbol No. Part No.
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OB329-1.qxp 03.12.3 1:16 PM Page 29 MSC-A07YV - E1 (WH) MSC-A09YV - E1 (WH) MSC-A12YV - E1 (WH) 12-4. INDOOR UNIT HEAT EXCHANGER 12-3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS 19 SLEEVE BEARING 18 21 (W) 16 17 15 2 1 ROOM TEMPERATURE THERMISTOR 3 13 12 22 14 4 11 23 5 FUSE 6 VARISTOR 7 8 9 10 (W) This figure shows about MSC-A12YV. 12-3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS Part number that is circled is not shown in the illustration. No.
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OB329-1.qxp 03.12.3 1:16 PM Page 30 12-5. AIR CLEANING FILTER ● AIR CLEANING FILTER removes fine dust of 0.01 micron from air by means of static electricity. ● Normal life of AIR CLEANING FILTER is 4 months. However, when it becomes dirty, replace it as soon as possible. ● Clogged AIR CLEANING FILTER may reduce the air conditioner capacity or cause frost on the air outlet. ● DO NOT reuse AIR CLEANING FILTER even if it is washed. ● DO NOT remove or attach AIR CLEANING FILTER during unit operation.
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OB329-1.qxp 03.12.3 1:16 PM Page 32 HEAD OFFICE: MITSUBISHI DENKI BLDG.,2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN C Copyright 2003 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Dec. 2003. No.OB329 6 Made in Japan New publication, effective Dec. 2003 Specifications subject to change without notice.