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21

DW-71-H

TROUBLESHOOTING AND CORRECTIVE ACTIONS

1.  Checking the use state and handling

When you receives any complaint from user, you must make correct judgment for proper troubleshooting.  There  are
many cases where incorrect information from user and preconception of troubles impede correct troubleshooting.
The following information will be useful for servicing personnel.
When receiving complaint from user, ask him to check as follows before requesting repair.

Checking

Symptom

Unit does not 
operate when 
power ON/OFF 
button is preesed.

The dehumidifying
capacity is low.

Humidity does not
decrease in each of
the operating modes.

Unit operation is
noisy.

Water is leaking.

Is the water tank set properly ?

Is the water tank full ?

Is the unit plugged properly ?

Is the power supply OK ?

Is the front filter  and air filter clogged ?

Is the air outlet or intake closed ?

Is the temperature and the humidity of your room too low ?

Is your room too wide ?

Are the windows, outlet/intake doors opened and closed frequently ?

Do you have a steam generating device such as an oil stove in your room ?

Is the dehumidifier installed properly and without play ?

Is your floor steady ?

Is the front filter clogged ?

Did the unit topple, or was it tilted or dropped ?

Is the pipe connection or hose connection for the continous drainage all right ?

Summary of Contents for DW-71-H

Page 1: ... OF OPERATION 17 TROUBLESHOOTING AND CORRECTIVE ACTIONS 21 LIST OF TROUBLES AND CORRECTIVE ACTIONS 22 ADAPTATION TO 96 CHLOROFLUOROCARBON REGULATIONS 25 HFC 134a CYCLE REPAIR PROCEDURE 26 PACKING 34 REPLACEMENT PARTS LIST 35 TABLE OF CONTENTS In the interests of user safety Required by safety regulations in some countries the set should be restored to its original condition and only parts identica...

Page 2: ... to water splashes This can cause electric shock or fire Do not install the unit at locations where oil or combustible gas leakage can occur Leaked oil or gas near the unit can cause fire Donotputavesselcontainingwatersuchasvaseontheunit Dripped water on the unit can lower the rate of electric insulation resulting in electric shock electrical leakage or fire This unit is for in door use only Do no...

Page 3: ...reeze and undrained water might spill in the room When operating Warning Important Do not stick your finger or any object into the air outlets or intake The rotating internal fan can cause injuries Do not operate the unit with voltages other than the rated voltage of 230V This can result in electric shock or fire Do not use an extension power supply cord or share the socket with other electrical a...

Page 4: ...t the air from passing and result in overheating or fire 5 cm or more Do not stand or sit on the unit Injury can be resulted if you fall down or the unit topples Do not wash the unit directly with water This can result in electric shock Do not place the unit near combustible equipment or under direct sunlight This can affect the combustible performance of the equipment Do not unplug by pulling the...

Page 5: ...ire Repair Warning Do not disassemble the dehumidifier Do not modify the unit This can cause fire electric shock or injuries This unit should not be disassembled or repaired by persons other than qualified technician Otherwise this might be resulted in fire electric shock or injuries Unplug from the socket When any abnormality for example burning smell is found turn the power off unplug the unit a...

Page 6: ...Discharge water elbow Overall size Weight Power supply cord Dehumidification enable area Refrigerant SPECIFICATION DW 71 H 6 3 L day daily dehumidifying capacity in conditions of room temperature 27 C and relative humidity 60 230V 50Hz 1 0A 187W 190W Rorary compressor output 100W model XB357RCA Plate type with forced draft Plate type with forced draft Hot gas defrosting ø160 sirocco fan Shading Co...

Page 7: ...ure may increase by about 2 5 C depending upon the operating conditions outside temperature room size As the drying and dehumidifying machine is used in closed room the room temperature rises in the summer Even when the drying and dehumidifying machine is used the humidity lower than approx 50 cannot be maintained There is no possibility however of excessive drying Principle of dehumidifying funct...

Page 8: ...diagonally downward direction Continuous drainage hole Used for draining water continuously Power supply cord Carrying handle Pull out the handle when moving the unit Carrying handle Cord clamp Plug Control Panel FULL lamp Lights when the water tank is full DEFROSTING lamp Lights when defrosting is carried out DEHUMIDIFYING lamp Lights during dehumidifying operation DRYING CLOTHES indicator lamp L...

Page 9: ... humidity The graph shows the dehumidifying capacity at specified temperature and humidity 1 Dehumidifying mode The fan motor runs slowly and continuously 2 Drying clothes mode The fan motor runs continuously with high speed air flow rate is increased by 20 The fan sucks the wet air into the dehumidifier The air is cooled by the cooler and the water vapor is condensed Dews on the cooler flow down ...

Page 10: ...ts about 12 the defrosting is ended and the normal operation is resumed The defrosting time is about 5 to 10 minutes 4 Hot gas defrosting system In the defrosting mode the solenoid valve is actuated and opened so that the hot gas flows in the arrow direction shown in the figure to remove the frost on the cooler In the defrosting mode the solenoid valve is actuated and opened so that the hot gas fl...

Page 11: ...lbow into the unit Return the water tank Open the front door and let the open end of the hose pass through the hole Remove the water tank and punch out the continuous drainage hole on the back of the unit using a screwdriver and finish the edge with a knife Continuous draining hole A commercially available hose with a 15 mm inside diameter 10 mm or more Drain hose elbow Push the drain hose elbow i...

Page 12: ...side of main unit Screw A 2 Remove four screws on the rear of main body Screw B Two screws on the bottom of main body are longer 3 Remove one screw at the center on the rear of main body Screw C Use the special screwdriver which matches the shape of the screw head as shown in the drawing The special screwdriver is used as a countermeasure to make the qualified engineer of the manufacturer or its r...

Page 13: ... fan motor If the fan motor failed to run be sure to replace the fan together with the fan motor The fan vibrates more remarkably causing growing noise After removing the front and rear parts of main unit 1 Disconnect the connector of power supply PWB Screw Casing Display PWB harness Power supply PWB For fan motor Harness fixing rib Fan fixing screw Screw Casing Screw Screw Transfomer cover The tr...

Page 14: ...ver to the right and then remove the remaining screws arrow mark Figure 4 2 below 2 Remove the connector Screw Up Screw To the right Screw Front part of main unit Switch box Red Low Screw Orange High Upper Gray Com Lower For compressor cord For defrosting lamp For magnetic coil For control For fan motor For power switch For power cord Waterproof rubber Waterproof rubber Switch box Button B for sel...

Page 15: ... part of main unit disengage the rib of dew pan with which the switch holder is engaged and withdraw the switch holder FULL switch ass y Switch holder Rib Fixture Terminal cover CN B 1 IS 187 natural color Shinagawa Shoko Purple Red IS 187 natural color Shinagawa Shoko To FULL switch IS 187 natural color Shinagawa Shoko To FULL switch Orange Capacitor 4µF 430VAC Red Orange Blue Gray Insert into ho...

Page 16: ...tank and insert the opposite side into the hole 3 Be sure to ascertain that the float flange lies on the protrusion of water tank Unless it lies on the protrusion operation is disabled 14 Removing the transformer 1 Remove the front and rear parts of main unit 2 Remove the power supply cover 3 Remove the screws 2 pcs fixing the transformer cover 4 Disconnect the connector of power supply PWB 11 Rem...

Page 17: ...17 DW 71 H CIRCUIT DIAGRAM AND EXPLANATION OF OPERATION Circuit diagram ...

Page 18: ...18 DW 71 H ...

Page 19: ...borted and the regular operation is restored 3 Water fullness detection When the water tank is filled fully with water or the tank has not been installed correctly the water fullness state is set The compressor fan motor and solenoid valve are stopped and the FULL lamp lights When the water fullness state is cancelled the operation mode preceding to the water fullness state is resumed The defrosti...

Page 20: ...20 DW 71 H 3 Location of PWB parts 1 Power supply PWB Parts side 2 Operation PWB Parts side ...

Page 21: ...ying capacity is low Humidity does not decrease in each of the operating modes Unit operation is noisy Water is leaking Is the water tank set properly Is the water tank full Is the unit plugged properly Is the power supply OK Is the front filter and air filter clogged Is the air outlet or intake closed Is the temperature and the humidity of your room too low Is your room too wide Are the windows o...

Page 22: ... sub winding Capacitor Power is not supplied when the switch lever is pressed ON FULL indication appears Capacitor opened or short circuited Protector opened Voltage detected Check parts of compressor Voltage not detected Check drive parts of compressor Power supply voltage not within 230V 10 When the compressor is started voltage is below 209V Sub winding opened Capacitor opened Replace the FULL ...

Page 23: ... short circuited Power is supplied continuously even when the water tank is removed The float does not function normally Improper installation Contact failure FULL circuit wiring failure Lower than 1 C Overcharge Fan motor failure Defrosting thermistor failure Operation PWB ass y failure Defrosting thermistor failure Improper insertion of defrosting thermistor Connector contact failure Power PWB a...

Page 24: ...24 DW 71 H ReferencesThermistor resistance Thermistor for defrosting Temperature C Resistance kΩ 5 0 237 1 0 179 5 2 5 156 6 5 0 137 0 10 0 105 3 12 0 95 02 15 0 81 59 20 0 63 65 25 0 49 99 ...

Page 25: ...rigerator refrigerant bomb and charging cylinder for HFC 134a and vacuum pump for R 12 and the other tools which are designated HFC 134a special for dehumidifier are special for the dehumidifier Here add the check valve of special tools for dehumidifier when using the vacuum pump for R 12 Take care to clearly discriminate the tools during use Moreover it is necessary to surely wash and clean new p...

Page 26: ... leaking part irrespective of whether it is at low pressure side or high pressure side Use the service parts of Dryer filter set for HFC 134a CDRY A001FBK0 with two evacuation pipes 1 List of service tools for dehumidifier specific use and common use For dehumidifier only Equipment name Gauge manifold Charging hose ass y Charging cylinder 3 way reducer for charging cylinder Check valve prevention ...

Page 27: ...the servicing time Primary evacuation 5 min Gas charging approx 30 g Secondary evacuation 30 min Gas charging specified quantity Vacuum of secondary evacuation must be at least 1 Torr or below In case of primary charge charge the coolant from the low pressure side and discharge from the high pressure side In case of secondary charge charge from the high pressure side Caution 1 When evacuating be s...

Page 28: ...uge manifold apply pressure approx 70 x 104 Pa approx 7 kg cm2 and check for leak with soapy water or testing liquid Monju If leak is found thoroughly wipe off the soapy water from the leaking part and then lower the nitrogen pressure so as to prevent entry of water into the pipe Caution Never use any flux when brazing Entry of water into the pipe causes cycle troubles Low pressuer High pressuer T...

Page 29: ...ing Additional valve opening Low pressuer High pressuer Gauge manifold Low pressure pipe side High pressure pipe side Dehumidifier Refrigeration cycle 3 way reducer 3 8 3 8 10mm Liquid side Gas side Charging cylinder for HFC 134a Charge gas adijusting valves Valve opening Purge the inside of cylinder and hose Valve closing Valve opening Valve closing Valve opening Valve closing Valve closing Liqui...

Page 30: ...ose the liquid side valve of charging cylinder and the high pressure valve of gauge manifold close all the valves To power source on off 1 2 3 4 Socket for vacuum pump Start of vacuum pump Check valve for vacuum pump Vacuum pump for R 12 Valve opening Valve opening Valve opening Low pressuer High pressuer Gauge manifold Low pressure pipe side High pressure pipe side Dehumidifier Refrigeration cycl...

Page 31: ...cle Take care so that the air does not enter into the cycle Never allow reduction of gauge pressure below 1 0 kgf cm2 G 10 Tighten the joint A which has been loosed in Step 7 above Slightly open the liquid side valve of charging cylinder and close A discharging gas Purge the inside of hose on A off Check valve for vacuum pump Vacuum pump for R 12 1 2 3 4 4 5 6 7 8 Valve opening Valve opening down ...

Page 32: ...igeration cycle Liquid side Gas side Charging cylinder for HFC 134a on off Check valve for vacuum pump Vacuum pump for R 12 1 2 3 4 4 4 Valve opening Valve closing Valve opening Siowly Valve closing Valve opening Siowly Valve closing Valve closing Valve closing Low pressuer High pressuer Gauge manifold Low pressure pipe side High pressure pipe side Dehumidifier Refrigeration cycle Liquid side Gas ...

Page 33: ...in that the temperature of discharge pipe and condenser rises on off Check valve for vacuum pump Vacuum pump for R 12 Valve opening Valve closing Valve closing Valve closing Valve closing Tight close the servise pipe and braze the front end Tight close the servise pipe and braze the front end Valve closing 1 2 3 4 5 Low pressuer High pressuer Gauge manifold Low pressure pipe side High pressure pip...

Page 34: ...flaps with staples Tape 40mm x 40mm Tow places at both sides fold back the tape Tape 25mm x 150mm fold back the tape Front door Water tank Tape 25mm x 150mm fold back the tape Power cord catch Power cord Fix the bottom flaps with staples Fix flaps with 4 staples Case 6 Insert the edges of outer top flaps of case into the slits of inner flaps to close the top Inner flap Outer flap Case Plug Plug pr...

Page 35: ...08FBF0 Evaporating pan 1 AL 2 23 FFLO A007FBF0 Float 1 AG 2 24 JHND A001FBF0 Tank handle 1 AF 2 25 PTNKNA012FBRA Drain tank 1 AQ 2 26 LANG A030FBW0 Motor fixing angle 1 AH 2 27 NFANSA003FBE0 Centrifagal fan 1 AN 2 28 PDUC A007FBF0 Casing 1 AN 2 29 FBOX A010FBF0 Control box 1 AR 2 30 GWAKPA009FBFB Filter frame 1 AP 2 32 LHLD A006CDF0 Switch holder 1 AF 2 33 PLEV A004FBF0 Switch lever 1 AD 2 34 GCOV...

Page 36: ...FBE0 Poly bag 1 AD 90 5 MJNT A001FBFA Pipe joint 1 AB 90 6 SSAKA010JWRE0 Poly bag 1 AA 90 7 TINSEA005FBR0 Operation manual English 1 AN 90 8 SPADPA003FBE0 Plug protector 1 AE 90 9 TGAN A058WRR0 Warning label 1 AF 90 10 TCAUHA008FBR0 Caution label 1 AE 90 11 TSPCNA102FBR0 Name plate 1 AE 90 12 SPADPA002FBE0 Protect sheet 1 AD HOW TO ORDER REPLACEMENT PARTS To have your order filled prompty and corr...

Page 37: ...28 1 3 2 26 2 4 2 3 1 11 6 8 2 2 4 2 2 27 2 32 6 10 6 6 6 2 6 3 6 7 4 1 2 18 2 8 2 17 2 33 2 35 1 8 2 20 2 22 6 5 6 4 6 9 6 1 2 16 1 10 6 12 6 13 1 7 6 14 2 21 2 19 2 46 2 15 6 11 2 14 2 23 2 24 2 25 2 9 2 36 2 37 2 41 1 12 1 1 2 39 2 42 1 13 2 5 2 30 2 7 2 38 2 40 2 43 2 45 1 14 1 2 1 5 2 44 ...

Page 38: ...38 DW 71 H ...

Page 39: ...39 DW 71 H ...

Page 40: ...40 DW 71 H 96 SHARP CORP YU0 10E Printed in Japan ...

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