Mitsubishi Electric Mr.Slim MSH24WN Service Manual
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Mitsubishi Electric Mr.Slim MSH24WN Service Manual

Split-type, heat pump air conditioners wireless type
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

SERVICE MANUAL

Wireless type
Models
MSH24WN
INDOOR UNIT
Indication of model name
MSH24WN
OUTDOOR UNIT
Indication of model name
MUH24WN
·
MUH24WN
(W)
CONTENTS
1. FEATURES ·························································3
2. PART NAMES AND FUNCTIONS······················4
3. SPECIFICATION·················································6
4. DATA···································································8
5. OUTLINES AND DIMENSIONS ·······················13
6. WIRING DIAGRAM ··········································15
7. REFRIGERANT SYSTEM DIAGRAM ··············16
8. MICROPROCESSOR CONTROL ····················17
9. SERVICE FUNCTIONS ····································29
Remote
10. TROUBLESHOOTING······································31
controller
11. DISASSEMBLY INSTRUCTIONS·····················44
12. PARTS LIST······················································48
13. OPTIONAL PARTS ······················BACK COVER
C
Revision:
PARTS LIST have been partially modified.
Please void OB310.
The Slim Line.
From Mitsubishi Electric.
US
No. OB310
REVISED EDITION-A
TM

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Summary of Contents for Mitsubishi Electric Mr.Slim MSH24WN

  • Page 1: Table Of Contents

    7. REFRIGERANT SYSTEM DIAGRAM ··············16 MSH24WN 8. MICROPROCESSOR CONTROL ····················17 9. SERVICE FUNCTIONS ····································29 Remote 10. TROUBLESHOOTING······································31 controller 11. DISASSEMBLY INSTRUCTIONS·····················44 12. PARTS LIST······················································48 13. OPTIONAL PARTS ······················BACK COVER OUTDOOR UNIT Indication of model name MUH24WN The Slim Line. From Mitsubishi Electric.
  • Page 2 Revision: • Parts No. has been changed due to the color change of outdoor unit parts. WHITE NEW WHITE (Brighter) • Capillary tubes have been added to parts list. Model Part number Page Part name CAPILLARY TUBE (TAPER PIPE) MUH24WN E02 785 936 [0.17X[0.12X11-13/16 CAPILLARY TUBE (TAPER PIPE)

  • Page 3: Features

    It has a liquid crystal display which indicates such information as mode, fan speed and temperature selected as well as the programmed ON/OFF timer. It is also equipped with “I Feel Control”, a unique Mitsubishi Electric fea- ture that allows the user to adjust the temperature to exactly the level he or she wants simply by tapping the button that describes present conditions : “Too Cool”...

  • Page 4: Part Names And Functions

    PART NAMES AND FUNCTIONS INDOOR UNIT MSH24WN Grille Air inlet Deodorizing filter (option) (Gray sponge type) Air cleaning filter (option) (White bellows type) Remote control Front panel receiving section Horizontal vane Air filter Remote controller Vertical vane Operation section Display section...

  • Page 5: Remote Controller

    REMOTE CONTROLLER MSH24WN Signal transmitting section Operation display section OPERATE /STOP (ON /OFF)button ON/OFF WARM COOL TEMPERATURE buttons Open the front lid. CLOCK ON/OFF WARM COOL VANE button FAN SPEED CONTROL button STOP (Horizontal vane button) I FEEL COOL OFF-TIMER button...

  • Page 6: Specification

    SPECIFICATION Model Item MSH24WN Cooling 22,000 Btu/h Heating 47 Capacity Btu/h 23,600 Heating 17 13,500 Btu/h Cooling 2,220 Power Heating 47 2,230 consumption Heating 17 1,730 [SEER] Cooling 9.9 (10.0) HSPF IV (V) Heating 6.8 (5.9) Heating 3.10 INDOOR UNIT MODEL...
  • Page 7 Outdoor unit Outside Outside Wall Wall diameter diameter thickness thickness Gas : 16-15/16 Gas : [ 3/8 MSH24WN MUH24WN [ 5/8 0.0315 0.0285 Liquid : 19-11/16 Liquid : MAX. HEIGHT DIFFERENCE Indoor unit w Height difference should be within Refrigerant Piping 25ft.

  • Page 8: Data

    DATA MSH24WN MUH24WN 4-1. PERFORMANCE DATA 1) COOLING CAPACITY (208V/ 230V) Indoor air Outdoor intake air DB temperature ( ˚F ) Model ( ˚F ) 27.0 13.4 1.98 25.2 12.5 2.16 23.7 11.7 2.33 22.0 10.9 2.45 20.2 10.1 2.55 MSH24WN 25.5...

  • Page 9: Performance Curve

    4-2. PERFORMANCE CURVE MSH24WN MUH24WN Cooling SHF at rating condition = 0.63 = 487CFM Airflow Bypass Factor = 0.19 208V/230V 208V/230V 65 70 75 80 85 90 95 100 105 110 115 Outdoor intake air DB temperature (°F) Heating Airflow...
  • Page 10 4-3. Condensing pressure Data is based on the condition of indoor humidity 50%. Air flow should be set to High speed. MSH24WN (Cooling) (PSIG) (PSIG) 68 70 104(°F) 68 70 104(°F) Outdoor ambient temperature Outdoor ambient temperature MSH24WN Data is based on the condition of outdoor humidity 75%.

  • Page 11: Standard Operation Data

    4-4. STANDARD OPERATION DATA Model MSH24WN Cooling Heating Item Unit 23,600 Capacity 22,000 Btu / h Total 0.63 – — 2.22 2.23 Input Indoor unit MSH24WN Power supply 115V 60Hz 1[ Input 0.071 0.62 Fan motor current Aux. heater current –...
  • Page 12 Outdoor unit Refrigerant piping length (one way) precharged Model (up to 25ft.) 25ft. 30ft. 35ft. 40ft. 45ft. 50ft. 4 lb. 0 oz. 1.61 3.22 4.83 6.44 8.05 MSH24WN MUH24WN CALCULATION : Xoz. = 1.61/ 5oz./ft. x (Additional Piping Length-25) ft.

  • Page 13: Outlines And Dimensions

    OUTLINES AND DIMENSIONS MSH24WN Unit: inch INDOOR UNIT Installation plate Indoor unit 3-7/8 6-13/16 42-1/16 16-5/16 16-5/16 3-7/8 6-13/16 Wall hole [ 2-15/16 8-7/8 3/16 43-5/16 Installation plate Liquid line [ 3/8 19-11/16 Gas line [ 3/4 16-15/16 Insulation [ 1-15/16 O.D Air in [ 1-1/4 I.D...
  • Page 14 MUH24WN Unit: inch OUTDOOR UNIT Outdoor Unit-Necessary surrounding clearance 7-9/32 19-11/16 7-9/32 Air intake Note:Allow adequate upper clearance 13/32 13/32 Air intake Front opening Air outlet Terminal block for power line 34-1/4 13/32 Terminal block for indoor and outdoor unit connection Service space 11-7/8 19-11/16...

  • Page 15: Wiring Diagram

    WIRING DIAGRAM MSH24WN MODEL WIRING DIAGRAM INDOOR UNIT RT13 CN201 HIC1 TO OUTDOOR RT12 UNIT CONNECTING CN112 WIRES NR11 12V DC FROM OUTDOOR UNIT TRANS CONNECTING WIRES SR141 TAB12 POWER SUPPLY CN211 115V 1 phase RT11 ELECTRONIC CONTROL P.C. BOARD...

  • Page 16: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM Unit: inch MSH24WN MUH24WN INDOOR UNIT OUTDOOR UNIT Strainer Refrigerant pipe [5/8 #100 4-way valve (with heat insulator) Muffler Stop valve Indoor coil Indoor SERVICE thermistor (with service port) heat Outdoor PORT exchanger RT12(main) heat Flared connection...

  • Page 17: Microprocessor Control

    MICROPROCESSOR CONTROL MSH24WN MUH24WN WIRELESS REMOTE CONTROLLER Signal transmitting section Once the operation mode is set, the same operation mode can be repeated by simply turning the OPERATE/STOP (ON/OFF) button ON. Operation display section Indoor unit receives the signal with a beep tone.
  • Page 18 (4) The initial set temperature is decided by the initial room temperature. Model Initial room temperature Initial set temperature 79-F or more 75-F COOL mode of "I FEEL CONTROL" Initial room temperature 77-F to 79-F minus 4-F DRY mode of Initial room temperature 73-F to 77-F "I FEEL CONTROL"...
  • Page 19 Operation chart Example Compressor Outdoor fan (continuously at set speed) Indoor fan 3. Discharge temperature protection The compressor is controlled by the temperature of discharge temperature thermistor RT62 for excess rise protection of compressor discharge pressure. • Compressor When the temperature of discharge temperature thermistor RT62 goes to 248°F or more, the compressor is turned OFF. After 3 minutes since the compressor has been turned OFF, if the temperature of discharge temperature thermistor RT62 becomes 212°F or less, the compressor is turned ON.
  • Page 20 8-1-3. HEAT mode of “I FEEL CONTROL” 1. Indoor fan speed control Difference between room temperature and set temperature Initial temperature difference Fan speed during operation (1) In AUTO the fan speed is as follows. Set temperature minus room temperature: 4 degrees or more················································· High Set temperature minus room temperature: Between 2 and 4 degrees ·····································...
  • Page 21 4. Defrosting Defrosting of outdoor heat exchanger is controlled by deicer P.C. board, with detection by the defrost thermistor RT61. (1) Starting conditions of defrost When all conditions of a) ~ c) are satisfied, the defrosting operation starts. a) Under the heat operation, the compressor cumulative operation time exceeds 40 minutes without the defrosting opera- tion working.
  • Page 22 5. 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. (HEAT) (COOL / DRY) 5 sec.
  • Page 23 8-5. INDOOR 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 feed back 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.
  • Page 24 (5) STOP (operation OFF) and ON-TIMER standby. When the following cases occur, the horizontal vane returns to the closed position. (a) When the OPERATE/STOP (ON/OFF) button is pressed (POWER OFF). (b) When the operation is stopped by the emergency operation. (c) When the ON-TIMER is on standby.
  • Page 25 (3) Positioning The vane is once pressed to the vane stopper to confirm the standard position and then set to the desired angle. Confirming of standard position is performed under following conditions. (a) When the OPERATE/STOP(ON/OFF) button is pressed (POWER ON/OFF). (b) When the SWING is started or finished.
  • Page 26 PROGRAM TIMER • The OFF timer and ON timer can be used in combination. • “ ” and “ ” display shows the order of the OFF timer and ON timer operation. (Example 1) The current time is 8:00 PM. (Example 2) The current time is 11:00 AM.
  • Page 27 8-9. LEV control LEV (Expansion valve) is controlled by “Thermostat ON” commands given from the unit. Controlled range Minimum : 54 pulse, Maximum : 500 pulse 30 ~ 90 pulse / second Drive speed Opening set The setting is always in opening direction. (To close the LEV, it is closed to the pulse smaller than the one which is set finally.
  • Page 28 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.

  • Page 29: Service Functions

    SERVICE FUNCTIONS MSH24WN MUH24WN 9-1. COMPULSORY DEFROSTING MODE FOR SERVICE By short circuit of the connector JPG1 and R871 on the outdoor deicer P.C. board, defrosting mode can be accomplished regardless of the defrost interval restriction. Defrost thermistor RT61 must read below 27°F. (Refer to page 42.) 9-2.
  • Page 30 Table 1 1 unit operation 2 units operation 3 units operation 4 units operation No. 1 unit No modification Same as at left Same as at left Same as at left No. 2 unit – Solder J1 Same as at left Same as at left No.

  • Page 31: Troubleshooting

    TROUBLESHOOTING MSH24WN MUH24WN 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 servicing the air conditioner, first be sure to turn off the remote controller to stop the unit, and then after con- firming the horizontal vane is closed, turn off the breaker and / or disconnect the power plug.
  • Page 32 10-2. Instruction of troubleshooting Start OPERATION Indoor unit Indoor unit Indoor unit INDICATOR operates. operates. doesn't receive lamp on the Outdoor unit Outdoor unit indoor unit is the signal from doesn't doesn't operate flashing on remote controller. operate. normally. and off. Outdoor unit Indoor unit Unit doesn't...
  • Page 33 1. Troubleshooting check table • The following indication applies regardless of shape of the indicator. flashing · Flashing of the OPERATION INDICATOR lamp (on the left-hand side) indicates possible Operation Indicator 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.
  • Page 34 2. Trouble criterion of main parts MSH24WN MUH24WN Part name Check method and criterion Figure Room temperature Measure the resistance with a tester. (Part temperature 50˚F ~ 86˚F) thermistor(RT11) Normal Abnormal Indoor coil thermistor Open or short-circuit (RT12(main), RT13(sub)) 8 k" ~ 20 k"...

  • Page 35: Check Of Indoor Fan Motor

    When OPERATION INDICATOR lamp flashes 3-time. Indoor fan motor doesn’t operate. Turn OFF the power supply. Check of indoor fan motor Check connector CN211 visually. Is soldered point of the connector Are lead wires connected? Resolder it. correctly soldered? Reconnect the lead wires. Disconnect lead wires from connector CN211 on the indoor electronic control P.C.

  • Page 36: Check Of Indoor Electronic Control P.c. Board

    The unit doesn’t operate with the remote controller. Also, the OPERATION INDICATOR lamp doesn’t light up by press- ing the EMERGENCY OPERATION switch. Check of indoor electronic control P.C. board Check the both “parts side” and “pattern Varistor (NR11) side” of indoor electronic control P.C. board visually.

  • Page 37: Check Of Outdoor Unit

    Compressor and/ or outdoor fan motor doesn’t operate. Check of outdoor unit Turn ON the power supply. Is there 208/230V AC Check the outdoor power supply to between on the and connection of wiring. outdoor terminal block Compressor does not operate. Is there 5V DC between Is there 208/230V AC Make the connection...
  • Page 38 Compressor and / or outdoor fan motor doesn’t stop. Check of outdoor unit 1 Turn OFF the power supply. 2 After 30 seconds, turn ON the power supply again. 3 Operate the unit in COOL or HEAT mode by pressing the EMERGENCY OPERATION switch. 4 Operate the unit for 1 minute or more and stop it by pressing the EMERGENCY OPERATION switch again.

  • Page 39: How To Check Mis-Wiring

    When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second. Outdoor unit doesn’t operate. How to check mis-wiring Start Turn OFF the power supply. Turn ON the power supply. Is the power voltage to terminal blocks of Rectify the wiring. indoor/outdoor units normal? Turn ON the EMERGENCY OPERATION switch.

  • Page 40: Check Of Lev (Expansion Valve)

    When OPERATION INDICATOR lamp flashes 10-time. Heating/ Cooling doesn't operate. Check of LEV (Expansion valve) 1 During pressing the OPERATION SELECT button and the TOO COOL button on the remote controller, press the RESET button. 2 First, release the RESET button. 1 During pressing the OPERATION SELECT (After 3 seconds, confirm all displays of the remote button and the TOO COOL button on the...
  • Page 41 TEST POINT DIAGRAM AND VOLTAGE MSH24WN Indoor electronic control P.C. board Varistor(NR11) Fan motor power supply Power supply input 115V AC 5V DC Fuse (F11) 250V AC 3.15A Room temperature thermistor(RT11) Indoor coil R132 thermistor(RT12(main)) Indoor coil thermistor(RT13(sub)) Emergency operation...
  • Page 42 MUH24WN Outdoor deicer P.C. board Defrost thermistor (RT61) Ambient temperature thermistor (RT63) Discharge temperature thermistor(RT62) -4 14 32 50 68 86 104 32 50 68 86 104 122 140 158 176 194 212 230 248 Temperature(-F) Temperature(-F) CN661 1-2 CN662 1-2 CN662 3-4 Defrost thermistor Discharge...
  • Page 43 RELAY OPERATION MSH24WN COMPRESSOR CONTACTOR • EACH MODE MODE THERMOSTAT 52C CONTACTOR INDOOR FAN SPEED COOL & COOL mode AUTO or set speed of I FEEL CONTROL OFF for 2 min. after AUTO or set speed unit starts operation. DRY &...

  • Page 44: Disassembly Instructions

    2Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. Connector 11-1. MSH24WN INDOOR UNIT PHOTOS OPERATING PROCEDURE 1. Removing the front panel Photo 1 (1) Remove the screw caps of the front panel. Front panel Remove the screws.
  • Page 45 OPERATING PROCEDURE PHOTOS 3. Removing the electrical box Photo 3 Screws of the ground wire (1) Remove the front panel. (Refer to 1.) (2) Remove the electrical cover. (Refer to 2.) (3) Disconnect the connector of the indoor coil thermistor (CN112), the fan motor connector (CN211 and Fan motor CN121) and the vane motor connector (CN151) on the connectors...
  • Page 46 11-2. MUH24WN OUTDOOR UNIT OPERATING PROCEDURE PHOTOS Photo 1 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 the Screws of the top panel catches on the both sides.
  • Page 47 OPERATING PROCEDURE PHOTOS 4. Removing the heat exchanger and compressor (1) Remove the screws of the rear panel. Remove the screws Photo 5 of the valve bed and the valve bed. (The valve bed is fixed Screws of the by the catches on the right and left sides. Lift it to remove.) rear guard Open the rear panel to the rear to remove.

  • Page 48: Parts List

    PARTS LIST MSH24WN (W) 12-1. INDOOR UNIT STRUCTURAL PARTS 12-2. INDOOR UNIT HEAT EXCHANGER CATCH Optional parts SCREW (See back cover.) 12-1. INDOOR UNIT STRUCTURAL PARTS Part number that is circled is not shown in the illustration. Q'ty/unit Symbol Part No.

  • Page 49: Electrical Parts

    MSH24WN (W) 12-4. ACCESSORY AND 12-3. INDOOR UNIT FUNCTIONAL PARTS AND REMOTE CONTROLLER ELECTRICAL PARTS SLEEVE BEARING ROOM TEMPERATURE THERMISTOR FUSE VARISTOR 12-3. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS Part numbers that are circled are not shown in the illustration.
  • Page 50 MUH24WN 12-5. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS...
  • Page 51 MUH24WN 12-5. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol in Wiring Part No. Part Name Remarks MUH24WN Diagram TOP PANEL NEW WHITE(Brighter) E02 813 297 RT62, RT63 E02 528 309 THERMISTOR...

  • Page 52: Optional Parts

    DEODORIZING FILTER and AIR CLEANING FILTER can be attached on either side. Deodorizing filter (Gray sponge type) C C Copyright 2004 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Jan. 2004. No.OB310 REVISED EDITION-A 6 New publication, effective Jan. 2004 Distributed in Mar. 2003. No.OB310 17...
  • Page 53 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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