Service Technician Manual
Contents
1. KL 1 4 TR g d 3 5 9 Se c RAS 4 SH QOO 0 041 K TO RELAY FCBA 17 AHNB20WBUS AHNB11WBUS Relay PCBA 25 o 5 TRANSFORMER TiCTLV2 NL 4 gt AHNB20WBUS only LEDCB LED BOARD ETE 182. Service Technician Manual GE REFRESH AHNB20WBUS AHNB11WBUS DEHUMIDIFIER Content ON 0 3 11 12 13 14 15 16 17 Outer Parts How the Dehumidifier Works Installation Brief Operations Fast Function Test Disassembly of Outer Parts Disassembly of PCBA and Fan Motor Disassembly of Defrost Sensor Micro Switch Compressor Terminals Locating Refrigerant Leaks Evacuation and Recharging Replacement of Refrigerant System Normal Conditions and User Checklist Complaints and Solutions Matrix Exploded Component Views Part List Circuit diagram Preface Purpose This service manual provides various service information containing the mechanical electrical and electronic parts Be sure to read the manual prior to servicing the unit Safety Precaution 1 When servicing the unit unplug the power cord 2 After servicing the unit make an insulation resistance test to protect the customer from being exposed to shock hazards Isolation resistance 1MQ 500V 1sec Specifications Model AHNB20WBUS AHNB11WBUS Function For ambient temperature 5 35 Capacity 30 C RH80 Power AC 220 240V ac 50Hz Power 20L day 11L day Consumption Control Micro control automatic defrosting 2 fan speeds Unique air purifying function Auto pause when bucket is full Net Weight 10 7 Kg 10 kg Dimensions W310 x D270 x H575 mm Refrigerant HFC
3. defrosting often 3 When the noise occurs Is the unit well in place 18 the filter dirty 13 Complaints and Solutions Matrix Control panel defect LED failure Replace LED or CPU PCBA Button failure Repair the button Dehumidifier does not full lights Empty or take out the bucket and operate both restore in place compressor and fan No power Check power supply motor do not operate Poor plug contact Replace or repair plug In the off condition Turn on the unit CPU or Relay PCBA failure Replace CPU PCBA or Relay PCBA Fan motor runs but Relay PCBA failure Replace Relay PCBA compressor does not run Compressor failure Check wires overload protector Not in 3 minute protection capacitor and compressor Frost or ice forms on Compressor just started Normal Disappear within 30 40 minute evaporator Unit short of refrigerant Repair leak and recharge designated quantity Fan motor failure Replace fan motor Insufficient Low relative humidity Turn off the unit or choose the dehumidification Air Purify function air circulation Move to obtain unobstructed air Air filter or heat exchangers circulation clogged with dust and dirt Clean replace air filter and heat exchangers Water drips on floor Drain passage clogged Clean the passage Leak in water bucket Replace water bucket Water bucket overflows Check reed switch and float activation Poor drain ho
4. air outlet before operating the unit b Must fit the bucket properly 1 Operating Air Filter Only Defrost Full High 04 SELECT ON OFF AHNB20WBUS 1 Plug the power cord to the proper power source press ON OFF key to start the unit 2 Press the select key 3 to activate the functions O in this order 3 Press the timer key to select the appropriate turn off time If Timer Indicator doesn t on the unit is not programmed to turn off automatically 4 Press the lon key AHNB20WBUS to start the lonizer Press the ION key again to stop the ionizer 5 Press the ON OFF key Q again to turn off the unit Unplug the cord when the unit is not expected to be used for a long period of time Note A protection mechanism prevents the compressor to start within 3 minutes after the unit is turned off Function Keys on OFF 9 Timer Key 8 AHNB20WBUS i Brief Operation 1 Indicators Full Blinks when the bucket is full or not in place Please empty the bucket or restore it in the correct position Defrost Blinks when defrosting It will auto return to dehumidifying Air Filter Only The unit only filters the air and does not dehumidify High Lit when running at high dehumidification speed Low Lit when running at normal dehumidification speed 8 Hours The unit will be shu
5. 00470 41202960 10500070 68000193 53100140 11501170 80003550 13202120 Suction Tube DS 84002820 45900100 05000050 74800180 Motor DS 220 230 e N gt RIB 0 o IN gt z2 2 2 AD COIN DIO BO O Oo 410 O1 BRIO 5 O co Oo IN DIO O9 410 O1 IWIN O N Oo 2 3 1 4 1 3 1 3 1 3 1 3 1 3 a jea 05 art No 11000740 40004630 41202970 41202980 42200570 42200560 11000730 11000750 DSWATER 311000790 246600180 11000700 11000710 11000780 SRELAY2NI 11000770 11501180 05000060 11000720 11501160 11200530 12000700 11501150 11501120 57000860 SCPUNI 00 PCBA CPU DS 14320412 1 1 5 23 3 4X44 41714400408 TH DT 4x10 14400410 TH DT 4x10 Y 14300301 PH DT 3x6 D Motor DS 220 230 74800180 53100580 16200020 14800620 41202990 41202380 41202680 41200470 41202960 10500070 68000193 53100570 11501170 80003560 13202130 84002830 45900100 05000050 Capacity 0 5uf 450v 9 N 8 5 AHNB20WBUS AHNB11WBUS CPU PCBA RTCC ai 4 70 MECR RYSVAASA 54 oscil
6. 134a i Outer Parts The Control Panel lonizer Timer Function Condition AHNB20WBUS Indicators Indicators Indicators AHNB20WBUS oes 6 9 t 8H Air Filter Only Defrost Full High M 2H SELECT ON OFF AHNB11WBUS Air Filter Only Defrost Full High SELECT t Function Key ON OFF Handle Air Outlet Five steps adjustable 4 Charcoal Filter Air inlet back 4 Drain Connector back Handle to lift the bucket Water Level Indicator Window Bucket use the handle to carry it refer to Page 5 How the Dehumidifier Works The dehumidifier as shown in the figure consists of a small refrigerant system and a fan The fan pulls humid air from the room across the cold evaporator where the water drips off into a water bucket or a drain hose The air then passes over the warm condenser and slightly increases in temperature Dry and Warm air out Condenser Evaporator Fan Humid air in Drain Pan Drain Passage Bucket Compressor Working Principle Side View Defrosting Control Under temperature around 59C frost may generate on the evaporator A defrost sensor fixed on the evaporator will sense the icing condition and stop the compressor but remain the fan through microcomputer control for 6 minutes defrosting
7. Then retrieve the compressor running at least 12 minutes Installation 1 To Set the Unit Keep a clearance of at least 5 cm at the back of the unit for air intake Do not insert small gt objects into the cabinet this may damage the unit Put the machine stable horizontal surface or water may leak Space and Capacity 30 80 RH 27 C 60 R c b d b Generally this 20 11 L day 30 C 8096 unit can serve a room of 60 32 square meter For a high moisture or open place the capable area may be less than 50 26 square meter d For a low moisture or closed place the capable area may be larger than 70 37 square meter For a room larger than 70 37 square meters it is recommended to use 2 or more units 0 10 20 30 40 50 60 70 at different corners Dehumidifying Capacity L day Room Area m Continuous Drainage You may use a hose with an outer diameter of 12 7 mm 1 2 inch for continuous drainage 1 Use a screwdriver to remove the knockout at the back Attach the tubing to the connector through the hole 2 The tubing should be lead to the drain with no sharp bends To Move the Unit 1 To move the unit use the retractable handle 2 Unplug the cord and empty the water bucket before moving the unit 3 Before operating the unit make sure the bucket is well in place Brief Operations Before Using a Turn the multi directional
8. gh refrigerant to enter the system that would raise the pressure to 40 to 50 p s i gauge pressure Close valve C Leak test low side of the system Run compressor for a few minutes then leak test the high side There should be no leaks You are now ready for final evacuation Recharging Condenser After evacuation leaving valve B closed observe liquid level in charging cylinder Check rating label for correct refrigerant charge Open valve C and allow proper charge to enter the system Close valve C Use pinch off tool clamp on to the process tube Using a tube cutter cut process tube about 2 inches from pinch off tool Solder process tube closed Then leak test the pinch off connection Copper Tube Evacuation and Recharging 11 Replacement of Refrigerant System Note 1 Do not replace a system component unless an unrepairable leak or malfunction is found within the component 2 When replacing components be careful not to damage adjacent parts when using a torch on soldered joints If necessary use a sheet of asbestos as a heat shield and wrap a wet cloth around the tubing to reduce heat transfer 3 After servicing always leak test the entire system especially new joints before final recharging Clean off any soldering flux if used from the joints before leak testing as flux can seal off pinhole leaks that would show up later 4 Replace the refrigerant filter whenever a refrigerant component i
9. ing will not permanently correct the problem and may lead to a compressor burn out If a leak is suspected attempt to find it before opening the system Leaks particularly small ones are easier to find if the surrounding air is not contaminated with refrigerant from the system Leaks are more easily found if the system is pressured to at least 75 p s i gauge If necessary attach a line piercing valve to the compressor process tube and add enough refrigerant to test Most leaks can be found with a Halide torch However for very small leaks it may be necessary to use an Electronic Leakage Detector or the bubble method to pinpoint the leaks Note Be sure the system has a positive pressure before using the bubble method of leak testing A vacuum within the system could draw in moisture and other contaminates Evacuation Cut compressor process tube purge system slowly so as not to blow out system oil Purge to a well ventilated area or outside atmosphere Use solder rod to weld on a new process tube Connect vacuum pump to compressor through process tube Start vacuum pump slowly open manifold valve A and B and leave valve C closed Operate vacuum pump until vacuum of 600 microns is obtained Close vacuum pump suction valve B and observe vacuum gauge for a few minutes A rise in pressure would indicate a possible leak or moisture is still present in the system With valve B still closed stop the vacuum pump Open valve C and allow enou
10. n Motor First remove the case Refer to Page 8 Remove the nut and washers which fasten the fan Note the left hand screw shaft Then remove the screws which fasten the fan motor To reinstall refer to the above removal procedures Disassembly of Defrost Sensor Reed Switch Compressor Terminals Defrost Sensor 2 First remove the case a Unplug the sensor wire from the CPU PCBA b Release the sensor tip fixed on the evaporator coil To reinstall refer the above removal procedures Wee b AS Note the sensor tip should firmly fit in the tube at the original position Water Level Switch Reed Switch im First remove the case Refer to Page 9 c Unlock the locking tabs to move out the shield plate for access of the switch To reinstall refer to the above removal procedures 57 A 272424 m Note Connect the wires to the common and NC poles Compressor Terminals First remove the case d Remove the clamp and terminal cover Pull out the starting relay and the overload Protector Unplug the wires To reinstall refer to the above removal procedures d 10 Locating Refrigerant Leaks Evacuation Recharging Refrigerant Leaks An undercharge of refrigerant is usually caused by a leak in the system Such leaks must be located and repaired before evacuating and recharging as simply adding refrigerant or recharg
11. ompressor or Repair CPU PCBA or Defrost Two Red LED Flash Sensor YES Full indicator and Defrost indicator blink Select button Disassembly of Outer Parts Air Filter 5 1 Turn off the machine and pull out the filter at the back 2 Do not wash the Charcoal Filter Please replace it with a new filter after 3 to 6 months recommended 3 Contact with your dealer should you need a new Charcoal Filter Bucket Turn off the unit first 1 To remove the bucket first pull it out 2 Lift it by the handle inside the bucket To reinstall refer to the above removal procedures Case Unplug the cord first 1 Remove the bucket 2 Remove the filter cover 3 Remove the handle by push slightly inward 4 Then remove 15 2 screws which fasten the front case and rear case and the base 8 To reinstall refer to the above removal procedures Disassembly and Fan Motor PCBA CPU PCBA Relay PCBA First remove the case Refer to Page 8 Remove the screws that fasten the PCBA Unplug the wires from connectors To reinstall the components refer to the above removal procedures and the wiring diagram Circuit Diagram Water Level Switch Defrost Sensor TAB1 RLY2 Overload Protector capacitor Compressor capacitor Wiring Diagram Fan and Fa
12. s replaced or the refrigerant is recharged so as to prevent moisture corrosion to the components Replace the System Components E First remove the case Refer to Page 8 B Pierce process tube to discharge the refrigerant B Remove 2 screws which fasten the upper chassis and remove the chassis along with the control panel B Unbraze the interconnecting tube Evaporator amp Condenser Capillary Covered Defrost with Gum Sensor B To reinstall a component replace repair evacuate charge refrigerant leak test pinch off silver solder the process tube and refer to the above removal procedures at the component to be removed Compressor Sub Tube Discharge Tube Filter Suction Tube with Wrap The Tubing Lett Side View 12 Normal Conditions User Checklist Normal Conditions It is normal that 1 The compressor is controlled to stay at least 3 minutes after it stop and after plugged to the power so as to ensure a smooth start This will extend the life of the unit User Checklist 1 When unit fails to run Is FULL blinking Is the bucket in a stable position Check and reset the bucket Is power cord unplugged 15 the power Is the unit defrosting Defrost blinking 2 When the performance seems low Is the filter dirty Clean or replace it 18 the inlet or the outlet covered 18 the room temperature or humidity low
13. se connection Check drain hose Noisy operation Tubing hits case Adjust tubing Fan loose or hits something Check the fan and remove foreign Internal compressor noise objects Replace compressor 14 o gt e o 5 Q gt lt L 277 4 7 NE nnnm 7 S __ o7 e 1 N y 15 AHNB20WBUS AHNB11WBUS art No 11000740 40004550 41202970 41202980 42200510 42200500 11000730 11000750 DSWATER 311000790 246600180 11000700 1 an ront Case DS 11000710 11000780 DSRELAY2 PCBA RELAY DS 220 311000770 311501180 05000060 11000720 11501160 311200530 Co m a ponent gt o R2 ND gt 22 4 05 1 4 CO O Oo JN 0 O1 5 O5 51 0 co 00 4 0 O1 2 D 05 011 fo O 4 4 2 412000700 311501150 Air Guide Blade 311501120 757000760 DSCPU 00 PCBA CPU DS AC Power Cord 2PIN DS 714320412 4 44 714400408 TH DT 4x10 4 714400410 TH DT 4x10 Y 714300301 PH DT 3x6 D 73000030 lonizer 230V 5 1 53100450 16200020 14800620 41202990 41202470 41202470 412
14. t off automatically after 8 hours 4 Hours The unit will be shut off automatically after 4 hours 2 Hours The unit will be shut off automatically after 2 hours lonizer Lit when the lonizer is on AHNB20WBUS 1 To Empty the Bucket 1 When the bucket is full of water the unit stops and the Full indicator blinks 2 Do not remove the bucket immediately as the unit may still working or shutting down Removing the bucket too fast may cause some water dripping 3 To remove the bucket pull it out and lift it carefully 4 After pouring out the water clean the bucket and restore in place To Pull out To lift To restore Fast Function Test The following procedure is for maintenance test only AHNB20WBUS AHNB20WBUS FEOL 42 0 4 Air Filter Only Defrost Full High ON OFF AHNB11WBUS Start when unplugged 1 Press the Select button 2 Plug the machine 7 7 Q 8H 2 Air Filter Only Defrost Full High SELECT 3 Release the Select button Change or Repair CPU PCBA or Relay All LED Hi Fan fon lon NO PCBA or Fan Motor or lon AHNB20WBUS Press and release the Select button again NO Change or Repair CPU PCBA gt or Relay PCBA or Relay PCBA or Fan Motor or Compressor Lo Fan ON Compressor Press and release the Select button again Lo Fan 1 OFF C
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