Page 2 - • Capillary tube has been added to parts list.; Part number
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 (TAPER 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 Pag...
Page 3 - FEATURES; Model
3 FEATURES 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 infor...
Page 4 - PART NAMES AND FUNCTIONS; INDOOR UNIT; Grille; OUTDOOR UNIT
4 PART NAMES AND FUNCTIONS 2 INDOOR UNIT MS24WN Installation plateInstallation plate fixing screw 4 x 25 mm(0.16 x 0.98 in.)Remote controller holderFixing screw for 3 3.5 x 16 mm(0.14 x 0.63 in.) (Black) Battery (AAA) for remote controllerWireless remote controller Felt tape (Used for left or left-r...
Page 5 - REMOTE CONTROLLER
5 REMOTE CONTROLLER MS24WN ON/OFF TOO COOL P M A M TOO WARM ON/OFF FAN TOO WARM TOO COOL VANE MODE STOP START HR. MIN. WIDE VANE LONG I FEEL COOL DRY P M C L O C K A M RESET CLOCK FAN Open the front lid. Signal transmitting section Operation display section OPERATE/ STOP (ON/ OFF)button TEMPERATURE ...
Page 6 - Operating Range; SPECIFICATION
6 3 Notes : Test 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 capacityPower consumptionEER [SEER]IND...
Page 7 - MAX. HEIGHT DIFFERENCE
7 w Height difference should be within 25ft. regardless of which unit, indoor or outdoor position is high. w Max. Height difference 25ft. Additional PipingMax. length A Indoor unit Outdoor unit MAX. HEIGHT DIFFERENCE Outside diameter Minimum Wall thickness Outside diameter Minimum Wall thickness MS2...
Page 8 - DATA; ) COOLING CAPACITY CORRECTIONS
8 DATA 4 4-1. PERFORMANCE DATA 1) COOLING CAPACITY MS24WN MU24WN Model Refrigerant piping length (one way) 1.0 25ft. (std.) 0.954 40ft. 0.923 50ft. MS24WN 2) COOLING CAPACITY 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 1.8...
Page 10 - Control voltage; Total; POWER SUPPLY
10 ✻ Control voltage Power supply voltage toserial signal circuit is 12V DC. Voltage 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 WIRE2 wires ...
Page 12 - OUTLINES AND DIMENSIONS
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) { Liqu...
Page 14 - WIRING DIAGRAM
14 6 MS24WN MU24WN MODEL WIRING DIAGRAM MODEL WIRING DIAGRAM INDOOR UNIT OUTDOOR UNIT OUTDOOR ELECTRONIC CONTROL P.C. BOARD FROM INDOOR UNITCONNECTING WIRES12V DC TO INDOOR UNITCONNECTINGWIRES115V1 phase 60Hz BLK RED FROM INDOOR UNITCONNECTING WIRE RED RED GROUND GRN/YL W RED BLU VLT BLU 7 POWERSUPP...
Page 15 - REFRIGERANT SYSTEM DIAGRAM
15 REFRIGERANT SYSTEM DIAGRAM 7 Indoor heat exchanger Outdoor heat exchanger Flared connection Room temperaturethermistorRT11 Indoor coil thermistorRT13(sub) DischargetemperaturethermistorRT62 Flared connection Stop valve Stop valve(with service port) Capillary tubeO.D.0.14 ✕ I.D.0.09 ✕ 1-31/32 Refr...
Page 16 - MICROPROCESSOR CONTROL; lighted; INDOOR UNIT DISPLAY SECTION; Example
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 modecan be repeated by simply turning theOPERATE/STOP(ON/OFF) button ON.Indoor un...
Page 17 - Fuzzy control; Indoor fan speed control
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 sys...
Page 19 - Set temperature; Coil frost prevention is as same as COOL mode of “I FEEL CONTROL”.; High; (1) Rotational frequency feedback control
19 8-3. DRY ( ) OPERATION (1) Press OPERATE/STOP(ON/OFF) button. OPERATION INDICATOR lamp of the indoor unitturns on with a beep tone. (2) Select DRY mode with the OPERATION SELECT button. (3) The microprocessor reads the room temperature and determines the set temperature. Set tempera-ture is as sh...
Page 20 - AUTO
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 OPERATE/STOP(ON/OFF) button is pressed(POWER ON/OFF).(b) When the vane control is chan...
Page 21 - Horizontal AIR FLOW blowing range
21 Air flow direction Air flow blowing range 6 1 2 3 4 5 SWING 2. Vertical vane(1) Vane motor drive This model is equipped with a stepping motor for the vertical vane. The rotating direction, speed, and angle of the motorare controlled by pulse signals (approx. 12V) transmitted from indoor microproc...
Page 22 - OPERATION INDICATOR lamp; PROGRAM TIMER; The OFF timer and ON timer can be used in combination.; ” or “
22 8-8. EMERGENCY-TEST OPERATION In case of test run operation or emergency operation, use the EMERGENCY OPERATION switch on the front of theindoor unit. Emergency operation is available when the remote controller is missing, has failed or the batteries of remotecontroller run down. The unit will st...
Page 24 - LEV opening
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 diff...
Page 25 - SERVICE FUNCTIONS; NOTE : For remodelling, take out the batteries; Table 1
25 9 SERVICE 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 c...
Page 26 - How to release “AUTO RESTART FUNCTION”; Turn off the main power for the unit.; Operation; power button of the remote controller is off.
26 How to release “AUTO RESTART FUNCTION” 1 Turn 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 3...
Page 27 - TROUBLESHOOTING; Lead wiring; components for bursting and discoloration.; How to replace batteries; Weak batteries may cause the remote controller malfunction.; RESET button; Remove the front lid and insert batteries.
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. Take care the following during servicing. 1) Before servici...
Page 29 - Troubleshooting check table
29 1. Troubleshooting 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 OPERATION INDICATOR lamp (on the left-hand side)...
Page 30 - Trouble criterion of main parts
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 PROTECTOR320 i 9 - F OPEN 198 i 20 - F CLOSE Indoor fan motor(MF) INNER PROTECTOR275 i 9 - F OPEN 187 i 27 - F CLOSE Normal Ter...
Page 31 - When OPERATION INDICATOR lamp flashes 3-time.
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 CN211 on the indoor electronic control P.C. board.Measure resistance...
Page 32 - Check of indoor electronic control P.C. board
32 Check of indoor electronic control P.C. board C The unit doesn’t operate with the remote controller.Also, the OPERATION INDICATOR lamp doesn’t light up by pressing the EMERGENCY OPERATION switch. Check the both “parts side”and “pattern side” of indoor electronic control P.C. board visually. Repla...
Page 33 - Check of outdoor unit; Compressor and / or outdoor fan doesn’t operate.
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. Yes Compressor does not operate. Yes 3minutes after the power supply turns ON, is there 208/230...
Page 34 - Compressor and / or outdoor fan motor doesn’t stop.
34 Check of outdoor unit E Compressor and / or outdoor fan motor doesn’t stop. After 30 seconds, does compressor stop? No Yes Is there 208/230V AC between A1-A2 on the compressor contactor(52C)? Yes 1 Turn OFF the power supply. 2 After 30 seconds, turn ON the power supply again. 3 Operate the unit i...
Page 35 - How to check mis-wiring; Yes
35 F F How to check mis-wiring Turn OFF the power supply. Turn ON the power supply. Turn ON the EMERGENCY OPERATION switch. (any mode possible) Make sure the unit emits a beep tone. Replace the outdoor electronic control P.C.board. ❈ Press the OPERATE/STOP(ON/OFF) button onthe remote controller to s...
Page 36 - Check of outdoor thermistor
36 Check of outdoor thermistor Measure resistance between CN 662 3 and 4 . No Yes Replace the thermistor. Measure resistance between CN 662 1 and 2 . Connect CN662.Turn ON the power supply and press the EMERGENCY OPERATION switch. Does the resistance of thermistor havethe characteristicson page 38? ...
Page 37 - Power supply input
37 TEST POINT DIAGRAM AND VOLTAGEMS24WN Indoor electronic control P.C. board Fan motor power supply Fuse (F11) 250V AC 3.15A } Power supply input 115V AC + } 5V DC Indoor coil thermistor(RT12(main)) Timer short mode point(JPS, JPG)(Refer to page 25.) Emergency operation switch + } 12V DC Indoor coil...
Page 38 - DC
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 2...
Page 39 - ON; • COIL FROST PREVENTION; COMPRESSOR CONTACTOR; • EACH MODE
39 MODE THERMOSTAT 52C CONTACTOR INDOOR FAN SPEED COOL & COOL modeof I FEEL CONTROL DRY & DRY modeof I FEEL CONTROL FAN 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 mi...
Page 40 - DISASSEMBLY INSTRUCTIONS; OPERATING PROCEDURE; Photo 2; Removing the front panel
40 DISASSEMBLY INSTRUCTIONS 11 11-1. 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 ...
Page 42 - Photo 1; Removing the cabinet
42 11-2. MU24WN OUTDOOR UNIT OPERATING 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. To remove the service panel, pull it down toward you and unhook thecatches on the both s...
Page 43 - Photo 5; Removing the heat exchanger and compressor
43 OPERATING PROCEDURE PHOTOS Photo 5 Photo 6 Photo 7 Heat exchanger Accumulator Stop valve Compressor Soundprooffelt Screw of theseparator 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...
Page 44 - PARTS LIST; Symbol; EXCHANGER; Part number that is circled is not shown in the illustration.
44 12 PARTS LIST MS24WN (W)12-1. INDOOR UNIT STRUCTURAL PARTS MS24WN E02 527 970E02 527 234E02 527 000E02 408 142E02 527 067E02 527 010E02 527 100E02 527 975E02 530 007 INSTALLATION PLATEBOX (W)FRONT PANEL ASSEMBLY (W)CATCHSCREW CAP (W)GRILLE (W)AIR FILTERCORNER BOX RIGHT LAMP PANEL Symbol in Wiring...
Page 45 - Part numbers that are circled are not shown in the illustration.
45 MS24WN E02 527 302E02 408 509E02 001 504E02 408 702E02 527 235E02 527 040E02 527 041E02 784 382E02 784 385E02 527 034E02 784 300E02 448 303E02 408 303E02 527 333E02 528 329E02 527 468E02 784 452E02 527 308E02 545 375E02 527 307E02 528 034E02 529 034 123456789 10 11 1213141516171819202122 LINE FLO...
Page 46 - AND FUNCTIONAL PARTS
46 MU24WN12-5. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS 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
Page 48 - OPTIONAL PARTS; DO NOT reuse AIR CLEANING FILTER even if it is washed.; Additional
13 OPTIONAL PARTS . New publication, effective Jan. 2004Specifications subject to change without notice. C C Copyright 2003 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD. Distributed in Jan. 2004. No. OB311 REVISED EDITION-A 6Distributed in Mar. 2003. No. OB311 17 13-2. AIR CLEANING FILTER ● AIR CLEANING ...
Page 49 - 400 Lawrenceville Suwanee Road; Specifications are subject to change without notice.
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 change without notice.
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