DEHUMIDIFIER SERVICE MANUAL Model 2013 No.MJW-E-1207A MJ-E21BG-S1-IT Sold from 2013 CONTENTS 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15.
1. Precautions Note) This page is extracted from the instruction manual.
Note) This page is extracted from the instruction manual. 2.
Note) This page is extracted from the instruction manual.
3. Specifications Note) This page is extracted from the instruction manual. 4.
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2) Board Diagram [Power control board] [Operation control board] 7
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7. Technical Points ■ Coolant Circuit φ6.35 Compressor Coolant flow Dehumidifying Defrosting φ5 φ5 φ6.35 Tube temperature sensing thermistor Solenoid valve Fan (closed when dehumidifying and open when defrosting) Heat exchanger (heat radiation) Blow Capillary tube φ5.0×φ4.0 Humidity sensor Heat exchanger (cooling) φ6.35 Intake Room temperature sensing thermistor φ6.35 φ6.35 Capillary tube φ2.0×φ0.8×φ340 ■ Performance curve Note) This page is extracted from the instruction manual.
8. Precautions for failure diagnosis The following precautions should be observed in order to perform troubleshooting safely and correctly. The following diagrams indicate circumstances where danger can result from mishandling the unit. WARNING Mishandling may result in fatal or serious injury, or fire. CAUTION Mishandling may result in minor or damage to your home or property ,etc. Meanings of graphic symbols are explained below.
9. Troubleshooting procedure 1) Failure diagnosis flowchart Are error codes displayed? “E0” “E1” “E7” “E8” “A1” “A2” “A3” “A6” “P4” NO Does the power lamp light by turning the power on? YES Refer to “Error Indications and CorrectiveActions,” and follow the procedures. NO Check the continuity of power cord. NG Replace the power cord. OK OK YES Check the current fuse of power control board (2A/250V). NG Replace the power control board.
A B Does the compressor operate? NO YES Is the operating environment YES low temperature? (less than 2°C) NO Dehumidification may not be OK possible in low temperature environments. (The compressor does not operate by detecting abnormal low temperature) NG Check if there is no disconnection NG or contact failure of the connector (P5) and connector pins of power control board. Insert the connector OK and connector pins securely. NG OK Check the current fuse of NG motor protector (2A/250V).
C D Does the solenoid valve operate? NO (Shorten J301 and J302) YES Check if there is no disconnection NG or contact failure of the connector (P3) and connector pins of power control board. Insert the connector and connector pins securely. NG OK NG Check the resistance of the solenoid valve coil.(P3 connector) Nornal:Between the pin1 and pin2 2.0kȍ-2.2kȍ Abnormal:Open or short Replace the solenoid valve coil. OK NG Replace the power control board. OK NG OK Replace the operation control board.
E Only a small quantity of water is dehumidified. NO YES Is the operating environment YES low humidity and low temperature? NO Is there any dust on the room YES temperature and humidity sensor? Dehumidication may not be OK possible in low humidity and low temperature environments. Explain the performance curve on P9. Remove the dust from the room OK temperature and humidity sensor.
2) Simple Check Table for Main Parts Component name Tube temperature sensing thermistor Room temperature and humidity sensor board Testing procedure Detach the connector and measure the resistance using a multimeter (component temperature: 10℃ to 30℃). Normal Abnormal Between P11 pins: 8.0kΩ to 20.8kΩ Open or shorted Detach the connector and measure the resistance using a multimeter (component temperature: 10℃ to 30℃).
3) Error Indications and Corrective Actions Indication (Timer display) Error (failure) E0 P10 connector out of position Room temperature thermistor blowout E1 Room temperature thermistor short Room temperature and humidity sensor board failure E7 P11 connector out of position Tube temperature thermistor blowout E8 Tube temperature thermistor short Tube temperature sensor failure A1 Microprocessor failure RAM error A2 Frequency determination error (When power is on) A3 Frequency determination
(2) LED, LCD and fan tests ① Start: Press the MODE and HUMIDITY SELECTION buttons simultaneously 4 times when the power is off. Press the POWER button within 2 seconds. ② Mode select: Use the OFF/ON TIMER button to change the diagnosis mode (0 - 5).
10. Troubleshooting Note) This page is extracted from the instruction manual.
11. Maintenance Note) This page is extracted from the instruction manual.
Note) This page is extracted from the instruction manual.
12. Service Checklist (1) Points to be checked after completing repairing After completing repairing, check the all items below to prevent re-repair. Check items Check Was the proper tool used? Are the parts on the parts catalog used? Verify that there is no problem in the lead wire (layout and connection) and/or clamp. Verify that there is no defect, such as lead wire caught in other parts, damage, and/or intermediate connection.
13. Precautions for Disassembly and Reassembly The following precautions should be observed in order to perform disassembly and reassembly safely and correctly. The following diagrams indicate circumstances where danger can result from mishandling the unit. WARNING Mishandling may result in fatal or serious injury, or fire. CAUTION Mishandling may result in minor or damage to your home or property etc. Meanings of graphic symbols are explained below.
CAUTION Wear protective gloves. Keep children away. Wear gloves Failure to do so may result in injuries by the edge of metal, electric shock, and/or burns caused by contact with hot section. Keep away Failure to do so may result in electric shock and/or injuries when moving the unit or using a measuring device. Do not put the unit where it may burn. Check the firmness of installation location. This may cause fire, or combustion. Do not install unit Perform operation check after reassembly.
14. Disassembly and Reassembly Hints 【Precautions for disassembly】 Ɣ&RQQHFWLRQ VKRXOG EH SHUIRUPHG ZLWKRXW IDLO HVSHFLDOO\ ZKHQ VFUHZV DUH XVHG IRU LW 7LJKWHQ WKH VFUHZV LQ WKDW FDVH Ɣ:KHQ WKH FDEOH WLH IL[LQJ WKH OHDG ZLUH LV FXW EH VXUH WR UHSODFH LW ZLWK D QHZ RQH Ɣ5HPRYHG OHDG ZLUH VKRXOG EH IL[HG WR D FODPSHU HWF DQG SHUIRUP ZLULQJ (1)Removing the water tank ①Open the front door and pull out the water tank.
(3)Removing and replacing the front casing assembly ①Remove the water tank. ĺ （Reference:(1)Removing the water tank) Special setscrews ③ ②Removing the front panel assembly and air filter. ĺ 5HIHUHQFH 5HPRYLQJ WKH IURQW panel and air filter) ④ ④ Catch(left side:1) Catch(Right side:1) ③5HPRYH WKH VSHFLDO VHWVFUHZV DQG front casing assembly setscrews(4).
(5)Removing and replacing the power control board ①Remove the power control board box lid. ĺ 5HIHUHQFH 5HPRYLQJ DQG UHSODFLQJ WKH front casing assembly) Remove all connectors from the power control board Power control board ② ②Remove all connectors from the power control board to remove the power control ERDUG ĺ 5HPRYLQJ DQG UHSODFLQJ WKH SRZHU control board) (6)Removing and replacing the condenser for compressor and tube temperature thermister ①Remove the power control board box lid.
(8)Removing and replacing the stepping motor and temperature/humidity sensor ①5HPRYH WKH UHDU FDVLQJ ĺ 5HIHUHQFH (7)Removing the rear casing) ② ③ Connector(P10) ②Remove the connector P20 and stepping motor setscrews(2) to remove the stepping PRWRU ĺ 5HPRYLQJ DQG UHSODFLQJ WKH stepping motor) Connector(P20) Stepping motor setscrews ③Remove the connector P10 and tape to separate the lead wire from the blower fan guide casing.
(10)Removing and replacing the blower fan and blower fan motor ①Removing the rear casing. ĺ 5HIHUHQFH 5HPRYLQJ WKH UHDU casing) Blower fan Blower fan guide casing Blower fan locknut ③ Catch ③ ④ ②Remove the power control board. ĺ 5HIHUHQFH 5HPRYLQJ DQG replacing the power control board) ③Remove the blower fan locknut(1) to remove the blower fan.
(12)Removing and replacing the float switch ①Remove the blower fan assembly. ĺ 5HIHUHQFH 5HPRYLQJ DQG UHSODFLQJ WKH EORZHU IDQ DVVHPEO\ Drainpan assembly Heat exchanger assembly ② ②Remove the float switch form the drainpan DVVHPEO\ ĺ 5HPRYLQJ DQG UHSODFLQJ WKH IORDW VZLWFK Float switch (13)Removing the drainpan ①Remove the blower fan assembly.
(14)Removing and replacing the compressor/heat exchanger assembly ①Remove the drainpan assembly.
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Model MJ-E21BG-S1-IT Parts List 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 and are of critical importance for sustaining safety and performance. Use specified parts atreplacement. 4. When ordering parts without part numbers, use the design number. The order may take a while to process. Exploded View Matching No.
Model MJ-E21BG-S1-IT Exploded View 209 213 212 211 206 207 205 216 214 210 218 A 208 220 204 219 Ins t Borouction k 201 217 215 34 202 203 221
Model MJ-E21BG-S1-IT Parts List 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 and are of critical importance for sustaining safety and performance. Use specified parts atreplacement. 4. When ordering parts without part numbers, use the design number. The order may take a while to process. Exploded View Matching No.
Model MJ-E21BG-S1-IT Exploded View 301 306 A 307 303 E C 302 B D 309 36 304 308 305
Model MJ-E21BG-S1-IT Parts List 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 and are of critical importance for sustaining safety and performance. Use specified parts atreplacement. 4. When ordering parts without part numbers, use the design number. The order may take a while to process. Exploded View Matching No.
Model MJ-E21BG-S1-IT Exploded View 419 411 412 A 401 403 402 413 414 415 416 406 417 418 404 421 405 407 408 409 420 38 422 410
Model MJ-E21BG-S1-IT Parts List 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 and are of critical importance for sustaining safety and performance. Use specified parts atreplacement. 4. When ordering parts without part numbers, use the design number. The order may take a while to process. Exploded View Matching No.
