Mitsubishi Electric MJ-E15BX-S1-IT Service Manual
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Mitsubishi Electric MJ-E15BX-S1-IT Service Manual

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DEHUMIDIFIER
SERVICE MANUAL
Model
CONTENTS
1. Product specifi cations ···································································································2
2. Outer Dimensions ··········································································································3
3. Names and Functions of Parts ······················································································3
4. Wiring Diagram ···············································································································5
1)
Wiring Diagram ········································································································5
2)
Board Diagram ·········································································································5
5. Function ··························································································································6
6. Timing Charts ················································································································14
7. Circuit Diagram ··············································································································16
8. Technical points ············································································································18
9. Troubleshooting Procedure ··························································································19
1)
Troubleshooting fl owchart ·······················································································19
2)
Key Component Check Procedures ········································································21
3)
Error Indications and Corrective Actions ·································································22
4)
Self diagnostic test program ····················································································22
10. Troubleshooting ············································································································24
11. Maintenance ···················································································································26
12. Disassembly and Reassembly Hints ···········································································30
13. Parts Catalog ·················································································································34
14. Precautions ····················································································································46
MJ-E15BX-S1-IT
ADVANCED AND EVER ADVANCING
MITSUBISHI ELECTRIC
Sold from 2010
2010
No.MJW-10010

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  • Page 1: Table Of Contents

    ADVANCED AND EVER ADVANCING MITSUBISHI ELECTRIC 2010 DEHUMIDIFIER No.MJW-10010 SERVICE MANUAL MJ-E15BX-S1-IT Model Sold from 2010 CONTENTS 1. Product specifi cations ···································································································2 2. Outer Dimensions ··········································································································3 3. Names and Functions of Parts ······················································································3 4. Wiring Diagram ···············································································································5 Wiring Diagram ········································································································5 Board Diagram ·········································································································5...

  • Page 2: Product Specifi Cations

    1. Product specifi cations Mode MJ-E15BX-S1-IT Item Dehumidifying capacity 15.0 (30°C room temperature, 80% relative humidity) (liters/day) High Operating noise levels(dB) Power supply Single phase, 220-240V, 50Hz (phases,V,Hz) Power consumption (W) Operating current (A) Starting current (A) Color tone Mocha Dimensions 568×390×205...

  • Page 3: Outer Dimensions

    2. Outer Dimensions 20.5 3. Names and Functions of Parts Control Panel CHILD LOCK lamp Tank FULL lamp DEO-DRY lamp Lights while child lock is The lights up to warn that the water tank is full. Lights during deodorizing CURRENT HUMIDITY Indicator active.
  • Page 4 Front Back Air intake Control panel Main air outlet Handle Louvre Filter cover Back air outlet Sensor Do not cover. Silver ion sterilizing and deodorizing fi lter Power plug Accessory Wheel (4) Silver ion sterilizing and deodorizing fi lter Tank Hereafter referred to as simply “sliver ion fi...

  • Page 5: Wiring Diagram

    4. Wiring Diagram 1) Wiring Diagram Floating element Tube temperature Power plug thermistor Run capacitor Solenoid valve Compressor Cool air damper Power/control board Warm air Cool air motor motor Stepping Warm air motor damper HUM.S P101 P100 Board-in connector Operation control board 2) Board Diagram [Operation control board] [Power/control board]...

  • Page 6: Function

    5. Function Function List Operation mode Compressor — — Cool air fan — — Warm air fan — — Solenoid valve — — Swing louvre Upward Closed Fully Damper — Cool air Warm air — — — — Dehumidifying Dehumidifying closed Laundry ☆...
  • Page 7 Laundry Operation 1. HIGH ① Control Summary (a) Dehumidifying operates continuously regardless of the humidity. (b) The constant compressor, cool air and warm air fans operate continuously. Target part Compressor Cool air fan Warm air fan Solenoid valve Louvre Damper Operation Dehumidifying Operation...
  • Page 8 ② Startup conditions (a) When operation is on while LAUNDRY operations are selected (b) When LAUNDRY operations are selected by operating the LAUNDRY switch ③ Stopping condition 1 (a) Average humidity and temperature are measured 30 minutes after starting LAUNDRY operations, and every 10 minutes from then on.
  • Page 9 Dehumidifying operation 1. Automatic Operation 22˚C 29˚C 36˚C Temperature 20˚C 27˚C 34˚C Humidity table Set humidity Dehumidifi cation Dehumidifi er mode Dehumidifi er mode Circulate Dehumidifi er mode Circulate Dehumidifi er mode Cool air fan Humidity Rank3 Rank3 Rank3 Rank5 variation table 2 Warm air fan Dehumidifi...
  • Page 10 2. Low Operation ① Control Summary (a) Dehumidifying operates continuously regardless of the humidity. (b) The constant compressor, cool air and warm air fans operate continuously. (c) By reducing the rank of the blower fan compared to high operation, the dehumidifi cation function is decreased during operation.(Creating low noise) Target part Compressor...
  • Page 11 3. COOL AIR/VARY Operation ① Control Summary (a) Dehumidifying operates continuously regardless of the humidity. (b) The constant compressor, cool air and warm air fans operate continuously. (c) Perform cool air operation by placing the damper position in cool air mode. (d) Control fl...
  • Page 12 DRYING INSIDE operation ① Control Summary (a) Prevents the growth of mildew by drying the moisture accumulated on the heat exchanger when the dehumidifi er is off. (b) DRYING INSIDE operation does not depend on a full water level to operate. (c) The following operations are performed during DRYING INSIDE operation.
  • Page 13 Blower fan rank Cool air (EVA) Fan rank Air Amount [m /min] Rotation speed [rpm] 1,100 1,100 1,200 1,200 Warm air (COND) Fan rank Air Amount [m /min] Rotation speed [rpm] 1,100 1,150 1,100 1,000 1,000 * The amount of air and the rotation speed values are standards. The values change depending on differences in the motor and the fi...

  • Page 14: Timing Charts

    6. Timing Charts...

  • Page 16: Circuit Diagram

    7. Circuit Diagram SOLENOID VALVE WARM COOL WARM AIR DAMPER COOL AIR DAMPER LOUVRE...

  • Page 18: Technical Points

    8. Technical points The amount of dehumidifying becomes less in winter. When the temperature and humidity are low, the amount of water collected is decreased. In winter, because the temperature is lower than in summer, the effect of the dehumidifi er is greatly reduced as shown in the graph below.

  • Page 19: Troubleshooting Procedure

    9. Troubleshooting Procedure 1) Troubleshooting fl owchart The unit does not operate Start Abnormal Restore AC power supply Check AC power supply Normal Blown Has the fuse blown out? Replace fuse Not blown Is the float switch turned on? Mechanical check •...
  • Page 20 Step 3 Does the compressor operate? (NO if stalled) Is there an overcurrent? Replace compressor *The compressor does not operate for (Surface is hot) 3 minutes after turning the power ON or OFF. Check connectors Is the continuity of the Replace motor protector motor protector no good? (Normal: CLOSE;...

  • Page 21: Key Component Check Procedures

    2) Key Component Check Procedures Component name Testing procedure Detach the connector and measure the resistance using a multimeter (component temperature: 10°C to 30°C). Tube temperature Normal Abnormal sensing thermistor P15 Between P15 pins: 8.0kΩ to 20.8kΩ Open or shorted Detach the connector and measure the resistance using a multimeter Room temperature and (component temperature: 10°C to 30°C).

  • Page 22: Error Indications And Corrective Actions

    3) Error Indications and Corrective Actions Indication Error (failure) Corrective action (Timer display) P31, 32 connector out of position Room temperature thermistor blowout Check the P31, 32 connection. Check the room temperature and humidity sensor Room temperature thermistor short board. Room temperature and humidity sensor board failure P15 connector out of position...
  • Page 23 (2) LED monitor display ●  Start Press the LAUNDRY switch and the DEHUMIDIFYING switch 4 times together when the power is off. Turn on the power within 2 seconds. ●  Mode select Use the OFF timer switch to change the diagnostic modes (0 to 8). ● ...

  • Page 24: Troubleshooting

    Troubleshooting For the symptoms listed below, refer to the remedies listed right. Symptom Cause/Remedy Air passed through the re-heating coil is warm. Unlike an air conditioner, the unit is not capable of cooling a whole room. The unit blows warm air Using the unit in a closed room will instead cause the room temperature to rise.
  • Page 25 Symptom Cause/Remedy Since the unit uses two fans and two motors in addition to the cool air function, the The operating operating sound becomes loud compared to models without a cool air function. This is not sound is loud a malfunction. If the operating sound bothers you, use the unit set to DEHUMIDIFYING LOW. Check to see if the unit is on a slope or uneven surface.

  • Page 26: Maintenance

    Maintenance Maintenance Do not use detergents, cleaning agents for heat exchange equipment, abrasive powders, chemically treated dusters, gasoline, benzene, thinners or other solvents, as they can damage the unit or the water tank, which may result in leakage. Once Every Two Weeks Silver Ion Filter, Air Intake, and Sensor Clogging with dust and the like reduces the effectiveness of the dehumidifying.
  • Page 27 Once Every Three Months Silver Ion Filter (Soak in Water) Soaking the silver ion fi lter in water enables you to remove fi ne dust and odor from the silver ion fi lter. <Preparation> Soak the silver ion fi lter in Press the POWER switch to turn off the water.
  • Page 28 Replacement Parts Maintenance (cont.) The silver ion fi lter becomes depleted over time. Replace it when necessary. Cleaning Replacing the silver ion fi lter Water tank · Main unit Although the silver ion fi lter lasts roughly 2 Wipe with a soft cloth. years, replace it when: You have soaked the fi...

  • Page 30: Disassembly And Reassembly Hints

    Disassembly and Reassembly Hints 1. Removing the water tank Step 1) Pull out the tank. Tank 2. Removing the fi lter cover and rear case Step 1) Hold the fi lter cover tabs, pull the fi lter cover (See Figure 1) toward you, and remove.
  • Page 31 Top case 4. Removing the control board setscrews ※ Pic. 1 Pic. 2 <<Removing the power supply board>> Operation Step 1) Remove the water tank, the left and right cases, control board the rear case, and the front case following the steps in sections 1 to 3 above.
  • Page 32 5. Removing the blower fan assembly Pic. 1 Step 1) Remove the water tank, the side case, the front case, and the rear case following the steps in sections 1 to 4 above. 2) Remove each connector (8) from the power/ Fan assembly control board, and remove the power/control board box assembly.
  • Page 33 6. Removing the drain pan assembly Pic. 1 Step 1) Remove the water tank, the front case, the rear Drain EVA case, the left and right cases, and the blower fan Setscrew Drain EVA assembly following the steps in sections 1 to 5 above.

  • Page 34: Parts Catalog

    Parts Catalog MJ-E15BX-S1-IT Model Structural Disassembly Diagram [Case and tank structural relationship]...
  • Page 35 Model MJ-E15BX-S1-IT Parts List [Case and tank structural relationship] Notes: 1. Circled reference numbers indicate performance parts. 2. New parts and the parts that are used only with these models lack compatibility. 3. Those parts that are marked by are of critical importance for sustaining safety and performance. Use specifi...
  • Page 36 MJ-E15BX-S1-IT Model Structural Disassembly Diagram [Case and tank structural relationship]...
  • Page 37 Model MJ-E15BX-S1-IT Parts List [Case and tank structural relationship] Notes: 1. Circled reference numbers indicate performance parts. 2. New parts and the parts that are used only with these models lack compatibility. 3. Those parts that are marked by are of critical importance for sustaining safety and performance. Use specifi...
  • Page 38 MJ-E15BX-S1-IT Model Structural Disassembly Diagram [Case and fan structural relationship]...
  • Page 39 Model MJ-E15BX-S1-IT Parts List [Case and fan structural relationship] Notes: 1. Circled reference numbers indicate performance parts. 2. New parts and the parts that are used only with these models lack compatibility. 3. Those parts that are marked by are of critical importance for sustaining safety and performance. Use specifi...
  • Page 40 MJ-E15BX-S1-IT Model Structural Disassembly Diagram [Case and fan structural relationship]...
  • Page 41 Model MJ-E15BX-S1-IT Parts List [Case and fan structural relationship] Notes: 1. Circled reference numbers indicate performance parts. 2. New parts and the parts that are used only with these models lack compatibility. 3. Those parts that are marked by are of critical importance for sustaining safety and performance. Use specifi...
  • Page 42 MJ-E15BX-S1-IT Model Structural Disassembly Diagram [Drain pan components]...
  • Page 43 Model MJ-E15BX-S1-IT Parts List [Drain pan components] Notes: 1. Circled reference numbers indicate performance parts. 2. New parts and the parts that are used only with these models lack compatibility. 3. Those parts that are marked by are of critical importance for sustaining safety and performance. Use specifi...
  • Page 44 MJ-E15BX-S1-IT Model Structural Disassembly Diagram [Heat exchanger components]...
  • Page 45 Model MJ-E15BX-S1-IT Parts List [Heat exchanger components] Notes: 1. Circled reference numbers indicate performance parts. 2. New parts and the parts that are used only with these models lack compatibility. 3. Those parts that are marked by are of critical importance for sustaining safety and performance. Use specifi...

  • Page 46: Precautions

    Continuing to operate the unit may result in Do not insert your fi ngers, bar, or fi re, electric shock, or malfunctions. Contact things that burn easily your dealer or Mitsubishi Electric Service such as paper into an Centre for consultation. air outlet or air intake.
  • Page 47 CAUTION Do not cover an air outlet or air intake Do not use the unit for special with laundry, cloth, curtain, etc. purposes, such as preservation of food, art or scientifi c works. This results in poor ventilation and may cause heat This may negatively generation/fi...
  • Page 48 Precautions (cont.) Precautions (cont.) CAUTION Install the unit in a location Switch the unit off and unplug where the fl oor is fl at and stable. from the power source when cleaning it. If the unit falls over, the water collected in the water tank may leak damaging surrounding objects and in turn result in fi...
  • Page 49 Issued in 2010.06...

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