Mitsubishi Electronics MS24WN manual

SER VICE MANUAL CONTENTS 1. FEA TURES ·························································3 2. P ART NAMES AND FUNCTIONS ······················4 3. SPECIFICA TION·················································6 4. D[...]

Revision: • Parts No. has been changed due to the color change of outdoor unit parts. WHITE ➔ NEW WHITE (Brighter) • Capillary tube has been added to parts list. CAPILLARY TUBE (T APER PIPE) [ 0.14X [ 0.09X1-31/32 E02 784 936 Part number Part name Model MU24WN Page 47 OB311--1.qxp 04.1.13 9:53 AM Page 2[...]

3 FEA TURES 1 “I FEEL CONTROL” IN OUR LCD WIRELESS REMOTE CONTROLLER WITH ON/OFF PROGRAM TIMER Mitsubishi Electric’s new wireless remote controller incorporates a number of advanced features that provide even greater con- trol and ease-to-use. It has a liquid crystal display which indicates such information as mode, fan speed and temperature [...]

4 P ART NAMES AND FUNCTIONS 2 INDOOR UNIT MS24WN Installation plate Installation plate fixing screw 4 x 25 mm(0.16 x 0.98 in.) Remote controller holder Fixing screw for 3 3.5 x 16 mm(0.14 x 0.63 in.) (Black) Battery (AAA) for remote controller Wireless remote controller Felt tape (Used for left or left-rear piping) 1 7 1 2 2 1 1 1 2 3 4 5 6 7 MS24W[...]

5 REMOTE CONTROLLER MS24WN ON/OFF TOO COOL PM AM TOO WARM ON/OFF FAN TOO WARM TOO COOL VANE MODE STOP START HR. MIN. WIDE VANE LONG I FEEL COOL DRY PM CLOCK AM RESET CLOCK FAN Open the front lid. Signal transmitting section Operation display section OPERA TE/ ST OP (ON/ OFF)button TEMPERA TURE buttons OPERA TION SELECT button F AN SPEED CONTROL but[...]

6 3 Notes : T est conditions are based on ARI 210/240 ❈ 1 : Rating conditions (cooling) — Indoor : 80˚FDB, 67˚FWB, Outdoor : 95˚FDB, (75˚FWB) ❈ 2 : Rating conditions (cooling) — Indoor : 80˚FDB, 67˚FWB, Outdoor : 82˚FDB, 65˚FWB Operating Range Item Model Cooling capacity Power consumption EER [SEER] INDOOR UNIT MODEL External finish[...]

7 w Height difference should be within 25ft. regardless of which unit, indoor or outdoor position is high. w Max. Height difference 25ft. Additional Piping Max. length A Indoor unit Outdoor unit MAX. HEIGHT DIFFERENCE Outside diameter Minimum W all thickness Outside diameter Minimum W all thickness MS24WN MU24WN Additional piping Max. length : ft. [...]

8 D ATA 4 4-1. PERFORMANCE DA T A 1) COOLING CAP ACITY MS24WN MU24WN Model Refrigerant piping length ( one way ) 1.0 25ft. (std.) 0.954 40ft. 0.923 50ft. MS24WN 2) COOLING CAP ACITY CORRECTIONS Model Indoor air Outdoor intake air DB temperature ( ˚F ) 71 67 63 TC 27.9 26.4 24.9 SHC 13.9 16.7 19.0 TPC 1.93 1.82 1.74 TC 26.1 24.6 23.0 SHC 13.0 15.5 [...]

9 4-3. Condensing pressure Data is based on the condition of indoor humidity 50%. Air flow should be set at High. MU24WN 70 75 80 85 90 95 100 104 ( ° F) 40 50 60 70 80 90 100 70 75 80 85 90 95 100 104( ° F) 160 180 200 220 240 260 280 300 86 80 75 70 Condensing pressure Outdoor ambient temperature (PSIG) 86 80 75 70 Indoor DB temperature Indoor [...]

10 ✻ Control voltage Power supply voltage to serial signal circuit is 12V DC. V oltage between 1 1 + and 3 3 -- on in-out terminal block will be 12V DC peak. •Both wirings can be applied. MS24WN INDOOR UNIT INDOOR UNIT 115V 60Hz 1 [ , 2wires OUTDOOR UNIT 208/230V 60Hz 1 [ , 3 wires SIGNAL WIRE 2 wires 12V DC OUTDOOR UNIT 208/230V 60Hz 1 [ , 3 w[...]

11 4-6. OUTLET AIR SPEED AND COVERAGE RANGE Model MS24WN Mode FAN COOL 565 487 Air flow (CFM) Air speed (ft./sec.) Coverage range (ft.) Function Dry Wet 34.2 29.4 20.1 17.2 4-7. ADDITIONAL REFRIGERANT CHARGE (R22(oz.)) MS24WN MU24WN Outdoor unit precharged (up to 25ft.) 4 lb. 5 oz. 25ft. 0 30ft. 0.81 35ft. 1.62 Refrigerant piping length (one way) 4[...]

12 OUTLINES AND DIMENSIONS 5 MS24WN INDOOR UNIT Unit: inch 6-3/8 3/4 2-5/16 1-7/8 5/16 12-3/8 10-1/16 1-7/8 1/8 3-7/8 3-7/8 6-13/16 6-13/16 16-5/16 16-5/16 3/16 8-7/8 8-15/16 9-15/16 31-1/8 2-3/16 42-1/16 43-5/16 12-13/16 Air out Air in Insulation [ 1-1/8 Drain hose [ 5/8 (Connected part O.D) { Liquid line [ 3/8 19-1 1/16 Gas line [ 3/4 16-15/16 In[...]

13 MU24WN OUTDOOR UNIT 4 13/32 39-3/8 For 10 units or less 7-7/8 Outdoor Unit-Necessary surrounding clearance (Concentrated installation) The upper side must be open. Outdoor Unit-Necessary surrounding clearance 7-7/8 13/32 13/32 13/32 Note:Allow adequate upper clearance 5-29/32 19-1 1/16 19-1 1/16 Service space Front opening R13/16 R13/16 1 max. S[...]

14 6 MS24WN MU24WN MODEL WIRING DIAGRAM MODEL WIRING DIAGRAM INDOOR UNIT OUTDOOR UNIT OUTDOOR ELECTRONIC CONTROL P .C. BOARD FROM INDOOR UNIT CONNECTING WIRES 12V DC TO INDOOR UNIT CONNECTING WIRES 1 15V 1 phase 60Hz BLK RED FROM INDOOR UNIT CONNECTING WIRE RED RED GROUND GRN/YL W RED BLU VL T BLU 7 POWER SUPPL Y 208/230V 1 phase 60Hz BLK 1 52C 2 R[...]

15 REFRIGERANT SYSTEM DIAGRAM 7 Indoor heat exchanger Outdoor heat exchanger Flared connection Room temperature thermistor RT1 1 Indoor coil thermistor RT13(sub) Discharge temperature thermistor RT62 Flared connection Stop valve Stop valve (with service port) Capillary tube O.D.0.14 ✕ I.D.0.09 ✕ 1-31/32 Refrigerant flow in cooling Compressor Re[...]

16 When the system is restarted after 2 hours and more, the operation mode is determined by the room temper- ature at start-up of the operation. 8 MICROPROCESSOR CONTROL Once the operation mode is set, the same operation mode can be repeated by simply turning the OPERA TE/ST OP(ON/OFF) button ON. Indoor unit receives the signal with a beep tone. Wh[...]

17 Mode COOL mode of "I FEEL CONTROL" DRY mode of "I FEEL CONTROL" Initial room temperature Initial set temperature 79 - F or more 77 - F to 79 - F more than 55 - F , less than 77 - F 75 - F Initial room temperature minus 4 - F Initial room temperature minus 4 - F ❈ 1 w 1 When the system is restarted with the remote controller[...]

18 Operation time chart Example Thermostat Indoor fan Outdoor fan Compressor ON 8 min. 1 min. 3 min. ON OFF OFF OFF OFF OFF ON ON ON ON ON ON OFF OFF OFF 3. Coil frost prevention The operation is as same as coil frost prevention during COOL mode of “I FEEL CONTROL”. Indoor fan operates at the set speed and the compressor stops for 5minutes, bec[...]

19 8-3. DR Y ( ) OPERA TION (1) Press OPERA TE/ST OP(ON/OFF) button. OPERA TION INDICA TOR lamp of the indoor unit turns on with a beep tone. (2) Select DRY mode with the OPERA TION SELECT button. (3) The microprocessor reads the room temperature and determines the set temperature. Set tempera- ture is as shown on the right chart. Thermostat (SET T[...]

20 (3) Positioning The vane is once pressed to the vane stopper below to confirm the standard position and then set to the desired angle. Confirming of standard position is performed in case of follows. (a) When the OPERA TE/ST OP(ON/OFF) button is pressed(POWER ON/OFF). (b) When the vane control is changed from AUTO to MANUAL. (c) When the SWING i[...]

21 Air flow direction Air flow blowing range 6 1 23 45 SWING 2. V ertical vane (1) V ane motor drive This model is equipped with a stepping motor for the vertical vane. The rotating direction, speed, and angle of the motor are controlled by pulse signals (approx. 12V) transmitted from indoor microprocessor . (2) The vertical vane angle and mode cha[...]

22 8-8. EMERGENCY -TEST OPERA TION In case of test run operation or emergency operation, use the EMERGENCY OPERA TION switch on the front of the indoor unit. Emergency operation is available when the remote controller is missing, has failed or the batteries of remote controller run down. The unit will start and the OPERA TION INDICA TOR lamp will l[...]

8-9. LEV control LEV (Expansion valve) is controlled by “Thermostat ON” commands given from the unit. Controlled range Basic specification Minimum : 54 pulse, Maximum : 500 pulse Drive speed 30 ~ 90 pulse / second Opening set Stop of indoor unit Opening in stop : 150 pulse ➔ LEV opening is set to becomes 500 pulse after 3 minutes passed. Remo[...]

24 2 When the temperature difference RT between indoor coil thermistor (main) RT12 and indoor coil thermistor (sub) RT13 in the indoor unit is 4deg. or more for a fixed time at cool or dry operation, the target discharge temperature is changed. After the temperature is changed, when temperature difference RT is 6deg. or more, the target temperature[...]

25 9 SER VICE FUNCTIONS 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 37.) Set time : 1 minute ➔ 1-second Set time : 3 minute ➔ 3-second (It takes 3 minutes for the compressor to start operation. However , the[...]

26 How to release “AUTO REST ART FUNCTION” 1 T urn off the main power for the unit. 2 Pull out the indoor electronic control P .C. board and the display P .C.board. (Refer to page 40.) 3 Solder the Jumper wire or the Resistor 220 Ω to the JR07 on the indoor electronic control P .C.board. (Refer to page 37.) Operation 1 If the main power (1 15[...]

27 TROUBLESHOOTING 10 MS24WN MU24WN Lead wiring Housing point 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. T ake care the following during servicing. 1) Before servicing the air conditioner , first be sure to turn o[...]

28 10-2. Instruction of troubleshooting Start Indoor unit operates. Outdoor unit doesn't operate. Indoor unit doesn't receive the signal from remote controller . OPERA TION INDICA TOR lamp on the indoor unit is flashing on and off. Outdoor unit operates in only T est Run operation. Outdoor unit doesn't operate even in T est Run opera[...]

29 1. T roubleshooting check table Before taking measures, make sure that the symptom reappears for accurate troubleshooting. Self check table • The following indication applies regardless of shape of the indicator . Operation Indicator · Flashing of the OPERA TION INDICA TOR lamp (on the left-hand side) indicates possible abnormalities. · The [...]

30 MS24WN MU24WN Part name Figure Check method and criterion Measure the resistance between the terminals with a tester . (Part temperature 14˚F ~ 104˚F) Compressor(MC) INNER PROTECTOR 320 i 9 - F OPEN 198 i 20 - F CLOSE Indoor fan motor(MF) INNER PROTECTOR 275 i 9 - F OPEN 187 i 27 - F CLOSE Normal T erminal C – R C – S 0.74 " ~ 0.91 &q[...]

31 Replace the receiver P .C. board. Replace the remote controller . Replace the batteries.(Refer to page 27.) Switch on the remote controller . Repair or replace the indoor fan motor . Resolder it. Disconnect lead wires from connector CN21 1 on the indoor electronic control P .C. board. Measure resistance between lead wires : No.1 and No.4 and the[...]

32 Check of indoor electronic control P .C. board C The unit doesn’t operate with the remote controller . Also, the OPERA TION INDICA TOR lamp doesn’t light up by pressing the EMERGENCY OPERA TION switch. Check the both “parts side”and “pattern side” of indoor electronic control P .C. board visually . Replace the fuse. Is fuse(F1 1) blo[...]

33 Check of outdoor unit D Compressor and / or outdoor fan doesn’t operate. Is there 208/230V AC between L1 - L2 on the outdoor terminal block ? No Check the outdoor power supply and connection of wiring. Ye s Compressor does not operate. Ye s 3minutes after the power supply turns ON, is there 208/230V AC between A1-A2 on the compressor contactor[...]

34 Check of outdoor unit E Compressor and / or outdoor fan motor doesn’t stop. After 30 seconds, does compressor stop? No Ye s Is there 208/230V AC between A1-A2 on the compressor contactor(52C)? Ye s 1 T urn OFF the power supply . 2 After 30 seconds, turn ON the power supply again. 3 Operate the unit in COOL mode by pressing the EMERGENCY OPERA [...]

35 F F How to check mis-wiring T urn OFF the power supply . T urn ON the power supply . T urn ON the EMERGENCY OPERA TION switch. (any mode possible) Make sure the unit emits a beep tone. Replace the outdoor electronic control P .C.board. ❈ Press the OPERA TE/STOP(ON/OFF) button on the remote controller to send signal. T urn OFF the power supply [...]

36 Check of outdoor thermistor Measure resistance between CN 662 3 and 4 . No Ye s Replace the thermistor . Measure resistance between CN 662 1 and 2 . Connect CN662. T urn ON the power supply and press the EMERGENCY OPERA TION switch. Does the resistance of thermistor have the characteristics on page 38? No Ye s Does the unit operate 10 minutes or[...]

37 TEST POINT DIAGRAM AND VOL T AGE MS24WN Indoor electronic control P .C. board Fan motor power supply Fuse (F1 1) 250V AC 3.15A } Power supply input 1 15V AC + } 5V DC Indoor coil thermistor(RT12(main)) T imer short mode point (JPS, JPG) (Refer to page 25.) Emergency operation switch + } 12V DC Indoor coil thermistor[RT12(main), RT13(sub)] Room t[...]

38 MU24WN Outdoor electronic control P .C. board Fuse (F61) 3.15A / 250V } 12V DC } 5V DC + + Temperature( - F ) Discharge temperature thermistor(RT62) Resistance(k " ) 32 50 68 86 104 122 140 158 176 194 212 230 248 0 100 200 300 400 500 600 700 800 900 Ambient temperature thermistor (RT63) 0 10 20 30 40 50 60 70 80 90 100 Resistance(k "[...]

39 MODE THERMOST A T 52C CONT ACTOR INDOOR F AN SPEED COOL & COOL mode of I FEEL CONTROL DRY & DRY mode of I FEEL CONTROL FA N ON OFF ON OFF OFF ON OFF OFF OFF for 2 min. after unit starts operation Repeat of 8 min. ON/ 3min. OFF operation or 2 min. ON/3 min. OFF operation Repeat of 4 min. OFF/ 1 min. ON operation AUTO or set speed AUTO or [...]

40 DISASSEMBL Y INSTRUCTIONS 11 1 1-1. MS24WN INDOOR UNIT (1) Slide the sleeve and check if there is a locking lever or not. (2) The terminal with this connector is a terminal with lock mechanism. 1 Slide the sleeve. 2 Pull the terminal while pushing the locking lever . 1 Hold the sleeve, and pull out the terminal slowly . In case of terminal with [...]

4. Removing the vane motor (1) Remove the front panel. (Refer to 1.) (2) Remove the electrical cover . (Refer to 2.) (3) Remove the lead wire of vane motor . (Refer to 3.) (4) Remove the R.L. holder . (5) Pull out the drain hose from the nozzle assem- bly , remove the nozzle assembly . (6) Remove the screws of the vane motor , disconnect the connec[...]

42 1 1-2. MU24WN OUTDOOR UNIT OPERA TING PROCEDURE PHOTOS Photo 1 Photo 2 Photo 4 Photo 3 1. Removing the cabinet (1) Remove the screws of the top panel and the top panel. (2) Remove the screw of the service panel. T o remove the service panel, pull it down toward you and unhook the catches on the both sides. (3) Remove the screw of the cover panel[...]

43 OPERA TING PROCEDURE PHOTOS Photo 5 Photo 6 Photo 7 Heat exchanger Accumulator Stop valve Compressor Soundproof felt Screw of the separator Screws of the rear guard Screws of the rear guard Screws of the rear panel 4. Removing the heat exchanger and compressor (1) Remove the screws of the rear panel. Remove the screws of the valve bed and the va[...]

44 12 P ARTS LIST MS24WN (W) 12-1. INDOOR UNIT STRUCTURAL P ARTS MS24WN E02 527 970 E02 527 234 E02 527 000 E02 408 142 E02 527 067 E02 527 010 E02 527 100 E02 527 975 E02 530 007 INST ALLA TION PLA TE BOX ( W ) FRONT P ANEL ASSEMBL Y ( W ) CA TCH SCREW CAP ( W ) GRILLE ( W ) AIR FIL TER CORNER BOX RIGHT LAMP P ANEL Symbol in Wiring Diagram Q'[...]

45 MS24WN E02 527 302 E02 408 509 E02 001 504 E02 408 702 E02 527 235 E02 527 040 E02 527 041 E02 784 382 E02 784 385 E02 527 034 E02 784 300 E02 448 303 E02 408 303 E02 527 333 E02 528 329 E02 527 468 E02 784 452 E02 527 308 E02 545 375 E02 527 307 E02 528 034 E02 529 034 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 LINE FLOW F AN BEAR[...]

46 MU24WN 12-5. OUTDOOR UNIT STRUCTURAL P ARTS, ELECTRICAL P ARTS AND FUNCTIONAL P ARTS 1 3 5 30 2 28 27 10 7 25 6 11 31 8 4 2 13 22 14 26 24 29 9 23 16 15 12 21 20 B A 9 17 18 19 OB311--2.qxp 04.1.13 10:02 AM Page 46[...]

47 MU24WN 12-5. OUTDOOR UNIT STRUCTURAL P ARTS, ELECTRICAL P ARTS AND FUNCTIONAL P ARTS MU24WN E02 813 297 E02 528 309 E02 527 630 E02 784 301 E02 214 501 E07 070 508 E02 813 290 E02 813 232 E02 819 009 E02 784 521 E02 528 493 E02 527 640 E02 527 506 E02 784 900 E02 527 662 E02 527 661 E07 001 641 E07 012 641 E02 474 642 E02 813 245 E02 813 006 E02[...]

13 OPTIONAL P ARTS . New publication, effective Jan. 2004 Specifications subject to change without notice. C C Copyright 2003 MITSUBISHI ELECTRIC ENGINEERING CO.,L TD. Distributed in Jan. 2004. No. OB31 1 REVISED EDITION-A 6 Distributed in Mar . 2003. No. OB31 1 17 13-2. AIR CLEANING FIL TER ● AIR CLEANING FIL TER removes fine dust of 0.01 micron[...]

3400 Lawrenceville Suwanee Road ● Suwanee, Georgia 30024 Toll Free: 800-433-4822 ● Toll Free Fax: 800-889-9904 www.mrslim.com Specifications are subject to ch ange without no tice.[...]