Lg Dh400ey7, Dh404ey7, Dh400my7, Ld40ey7, Ld40y7 Service Manual

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Dehumidifier

SERVICE MANUAL

MODELS: DH300EY7/DH305Y7/DH300MY7/DH305T7

LD40Y7/DH400MY7 DH404EY7/DH400EY7/LD40EY7 DH504ELY7/LD50ELY7/LD50EBL/DH500MY7 LD65ELY7

CAUTION

- BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

- ONLY FOR AUTHORIZED SERVICE.

—2—

1. PREFACE

1.1 SAFETY PRECAUTIONS...........................................................................................................................3

1.2 FEATURES AND DIMENSIONS ................................................................................................................3

1.2.1 FEATURES........................................................................................................................................3

1.2.2 DIMENSIONS ....................................................................................................................................3

1.3 MODEL NAMES .........................................................................................................................................4

1.4 SPECIFICATIONS......................................................................................................................................4

1.5 CONTROL TYPE........................................................................................................................................5

1.5.1 MECHANICAL TYPE.........................................................................................................................5

1.5.2 ELECTRONIC TYPE .........................................................................................................................5

1.6 HOW TO OPERATE DEHUMIDIFIER ........................................................................................................6

1.6.1 HOW DOES THE DEHUMIDIFIER WORK? .....................................................................................6

1.6.2 LOCATION FOR THE DEHUMIDIFIER.............................................................................................6

1.6.3 MICRO SWITCH................................................................................................................................6

1.6.4 AUTO DEFROST...............................................................................................................................6

1.6.5 HUMIDITY CONTROLLER................................................................................................................7

2. CIRCUIT DIAGRAM............................................................................................................................8

DISASSEMBLY INSTRUCTIONS

3.1 MECHANICAL PARTS.............................................................................................................................15

3.1.1 BUCKET AND AIR FILTER.............................................................................................................15

3.1.2 FRONT CASE AND TOP COVER...................................................................................................15

3.1.3 CABINET AND CONTROL BOX.....................................................................................................15

3.2 CONTROL PARTS ..................................................................................................................................16

3.2.1 POWER CORD ASSEMBLY...........................................................................................................16

3.2.2 SENSOR ASSEMBLY.....................................................................................................................16

3.2.3 PWB(PCB) ASSEMBLY, MAIN.......................................................................................................16

3.2.4 CAPACITOR....................................................................................................................................16

3.2.5 MICRO SWITCH ASSEMBLY.........................................................................................................16

3.2.6 COIL ASSEMBLY, SOLENOID.......................................................................................................17

3.2.7 CONTROL PANEL..........................................................................................................................17

3.2.8 FAN AND MOTOR...........................................................................................................................18

3.2.9 DRAIN PAN.....................................................................................................................................18

3.3 REFRIGERATING CYCLE.......................................................................................................................19

3.3.1 CONDENSER, EVAPORATOR AND CAPILLARY TUBE...............................................................19

3.3.2 ROTARY COMPRESSOR ..............................................................................................................19

3.4 HOW TO REPLACE REFRIGERATION SYSTEM...................................................................................20

4. TROUBLESHOOTING GUIDE...................................................................................................22

5. EXPLODED VIEWS..........................................................................................................................24

6. REPLACEMENT PARTS LIST...................................................................................................32

CONTENTS

—3—

1. PREFACE

This Service Manual provides various service information, including the mechanical and electrical parts. This dehumidifier was manufactured and assembled under the strict quality control procedures.

The refrigerant is charged at the factory. Be sure to read the safety precaution prior to servicing the unit.

1.1 SAFETY PRECAUTIONS

• Disconnect the power supply before servicing or replacing any component.

• Do not cut off the grounding prong or alter the plug in any manner.

1.2 FEATURES AND DIMENSIONS

1.2.1 FEATURES

• Quiet operation

• High efficiency

• Adjustable humidistat

• Automatic defrost

• Automatic shut-off

• Bucket-full indicator light

• Easy roll casters

• Removable & large capacity bucket.

• Washable air filter

• Two-speed fan

• Drain hose connection.

• Low temperature operation (DH504ELY7/LD50ELY7/LD50EBLY7/LD65ELY7)

1.2.2 DIMENSIONS (mm/in)

Figure 1

385 (15

)

FAN

SPEED

TIMER

High Low

Continuous On. 4Hr. On/Off 2Hr. On/Off

HUMIDITY CONTROL

BUCKET

FULL

POWER

AUTO RESTART

HUMIDITY SETTING

340 (13

)

540 (21

)

ENERGY STAR

1.3 MODEL NAMES

MODEL NAME

CAPACITY (Pints/24hrs) 30 40 50 65

DH305Y7, DH300MY7 DH400MY7,LD40Y7 DH500MY7 -

CONTROL

PANEL

MECHANICAL TYPE

ELECTRONIC TYPE

DH305T7

DH300EY7

DH404Y7 LD65ELY7

DH400EY7,LD40EY7

DH504EL

LD50EL

LD50EBLY7

1.4 SPECIFICATIONS

DH504ELY7

MODELS

ITEMS

POWER SUPPLY(Phase,V,Hz) INPUT(W RUNNING CURRENT(A ENERGY FACTOR(L/kw.h REFRIGERAN REFRIGERANT CHARGE, oz(g

SOLENOID VALVE*

COMPRESSOR MODEL No. SD074SW QA075CDB QA114CBD

PROTECTOR

CAPACITO

MOTOR ASSEMBLY,SINGL

SWITCH ASSEMBLY,MICRO OUTSIDED MENSIONS WxHxD,mm(in)

NET WEIGHT,kg(lbs

) 560 560 8 0

)

) 1.05 1.50 1.75 1.60

) 4.94(140) 5.82 9.17(260) 8.64(245)

OPEN

THERMISTOR

R 40µF, 270VAC 35µF, 270VAC 35µF, 270VAC

E Shaded pole motor, 72W/1.4A, Thermal cutoff:266°F/130°C

)

DH305Y7 DH300MY7 DH300EY7

SD074SW

35µF, 270VAC

20.1

DH305T7

5.1

5.29(150)

QA064CBA

(

)

44.3

DH400MY7, LD40Y

DH404EY

DH400EY7, LD40EY

OVERLOAD PROTECTOR FOR COMPRESSOR

INTERNAL PROTECTOR(FUSE)FOR MOTOR

385X540X340(15 5/32 x 21 1/4 x 13 3/8)

255

5.0 7.6

(165)

33.8

(44.5

20.

LD50ELY7

DH500MY7

LD50EBLY7

1Ø, 115V,60Hz

R22

°F(1±0.5°C)

°F(10±0.5°C)

Using Temp/Humid.:-4~122°F(-20~50°C)/95%RH

Rating:7W/90mA

15A/250VAC

) 22.5(49.6) 22.2(48.9)

LD65ELY

Shaded pole motor, 91W/1.8A,

Thermal cutoff:266

°F/130°C

*NOTE:Specifications are subject to minor change without notice for further improvement.

—4—

—5—

Humidity Control

• When you first use the dehumidifier, turn the humidity control to 5 or 6. If you still have moisture, turn the humidity control to a higher setting. MAX is the highest setting.

• When excess moisture and dampness odors are gone, adjust the control to a lower setting. Use the dehumidifier as long as excess moisture is present.

Fan Speed

• The fan control adjusts the fan speed. Set the fan control to HIGH for maximum moisture removal. When the humidity has been reduced and quiet operation is preferred, set the fan control to

LOW.

Bucket Full Indicator

• This light glows when the water bucket is full and needs to be emptied.

Power

• Operation starts when this button is pressed and stops when the button is pressed again.

Auto Shut-Off

• This light glows when the bucket is full, or when the bucket is removed or not placed in the proper position. In these cases the Water Level Control Switch shuts off the dehumidifier.

• When the light glows, check the bucket condition.

Fan Speed

• This controls the speed of the airflow.

• High: Fan speed is set to high.

• Low: Fan speed is set to low.

• When Fan Speed button is pressed, the fan speed

mode is changed.

Timer

• Press this button to select type of operation.

• Select continuous On for uninterrupted operation.

• Select either 2 or 4 hr. On/Off for cycled operation:

The unit will operate for 2 or 4 hours, and then shut off completely for 2 or 4 hours. The cycle repeats until you change the setting.

• When Timer button is pressed, the Timer indicator lights shift as follow from 2hr.On/Off to 4hr.On/Off.

Auto Restart

•

Once power is restored after a power outage, the unit returns to its previous operation setting after a 2 minute delay. The fan runs immediately when the power is restored.

Figure 2

Figure 3

Humidity Control

• This button controls the humidity in the room.

• Press button to raise the humidity setting.

• Press button to lower the humidity setting.

• The humidity setting can be set to a permanent "On"

setting or to a specific humidity setting between 35% and 70% in 5% increments.

• "On" setting: Dehumidifier runs continuously regardless of humidity condition.

• 35% - 70% setting: Dehumidifier runs on and off according to surrounding humidity conditions.

1.5 CONTROL TYPE

1.5.1 Mechanical type

1.5.2 Electronic type

Auto

Shut-Off

Off

Humidity Control

Constantly On. 4hr. On/Off 2hr. On/Off

TIMER

FAN

SPEED

High Low

Max

HUMIDITY

SETTING

Fan Speed

HUMIDITY CONTROL

High

Low

BUCKET

FULL

AUTO RESTART

POWER

—6—

1.6.1 HOW DOES THE DEHUMIDIFIER WORK?

Moist, humid air is drawn over a cold refrigerated dehumidifying coil. Moisture in the air condenses on this coil and drains into a bucket (or through the bucket into a hose and drain).

Dry, clean air is drawn over the condenser where it is actually heated several degrees and discharged out the rear grill into the room. (See Figure 4)

■ It is normal for the surrounding air to become

slightly warmer as the dehumidifier operates.

This warming effect further reduces the relative humidity of the surrounding air.

1.6.2 LOCATION FOR THE DEHUMIDIFIER

Allow at least 12 inches of space on all sides of the unit for good air circulation. (See Figure 5)

■ The dehumidifier must be operated in an enclosed

area to be most effective.

■ Close all doors, windows and other outside

openings to the room.

Place the dehumidifier in a location that does not restrict air flow into the front grille or out the rear grille.

The operation of dehumidifier in a basement will have little or no effect in drying an adjacent enclosed storage area, such as a closet, unless there is adequate circulation of air in and out of the area.

Fan

Side View

Condenser

Evaporator

Motor

Compressor

Rear Grille

Bucket

Dry

Air Out

Humid

Air In

12"

Figure 4

Figure 5

1.6 HOW TO OPERATE DEHUMIDIFIER

1.6.3 MICRO SWITCH

The micro switch assembly, which is located on the drain pan of inside unit, automatically shuts off the dehumidifier when the bucket is full (note, the Auto Shut Off lights, to indicate bucket must be emptied). The bucket replaces in its place, the unit again turns itself on.

1.6.4 AUTO DEFROST

When frost builds up on the cooling coils, the unit will automatically cycle off until the frost disappears. The fan continues to run.

NOTE: The unit will not operate satisfactorily if the room temperature is below 65˚F(18˚C). If the dehumidifier is

operated in low temperature conditions frost can form in the evaporator coil and the unit will cycle ON/OFF repeatedly. In this case, please check your room temperature conditions and stop the unit.

NOTE:

The low temperature operation feature in the DH504ELY7, DH50ELY7 and DH65ELY7 models will continuously cycle up to a temperature of 42°F(6°C).

—7—

1.6.5 HUMIDITY CONTROLLER

1.6.5.1 Mechanical Type

The humidity control can be set anywhere between Off and Max for normal operation.

If you need more dehumidification, turn the Humidity Control toward Max. If you need less dehumidification, turn the Humidity Control toward Off.

The relative humidity range is from 20% to 80%. (See Figure 6)

Turn the Humidity Control to Off to stop the unit manually.

1.6.5.2 Electronic Type

The humidity control can be set 'on' or 35%-70% RH(Relative Humidity) for normal operation. (See Figure 7)

If you need drier air, press the Humidity Control button. If you need moister air, press the Humidity Control

button. Press the Power button to stop the unit manually.

HUMIDITY

CONT

ROL

HUMIDITY

SETTING

42% R.H

40%

7(30%)

6(35%)4(50%)

3(60%)

2(70%)

1(80%)

5(42%)

8(25%)

9(20%)

Max.Off

DEAD DIAL

Figure 6

Figure 7

2. CIRCUIT DIAGRAM

• MODEL : DH305Y7, DH300MY7

NO.

POWER CORD ASSEMBLY

SWITCH, ROCKER

MOTOR ASSEMBLY

CAPACITOR

COMPRESSOR, SET

OLP

PWB(PCB) ASSEMBLY, DISPLAY

SENSOR ASSEMBLY

SWITCH ASSEMBLY, ROTARY

SWITCH ASSEMBLY, MICRO

PWB(PCB) ASSEMBLY, MAIN

S: SERVICE PARTS A: ALTERNATE PARTS N: NOT SERVICE PARTS

DESCRIPTION

DH305Y7

DH300MY7

TBZ30871801

EAF35787201

PART NO.

DH305T7

6411A20001Z

6600FX5001G

4681A20040Q

0CZZA20005J

TBZ31057901

6750U3L001A

6871A20289B

6877A30013L

6601A30006A

6600A30003C

6871A10142A

Q'TY

PER SET

MARKS

RE-

—8—

—9—

• MODEL : DH300EY7

S: SERVICE PARTS A: ALTERNATE PARTS N: NOT SERVICE PARTS

Q'TY

PER SET

RE-

MARKS

DESCRIPTION

POWER CORD ASSEMBLY

MOTOR ASSEMBLY

CAPACITOR

COMPRESSOR, SET

OLP

PWB(PCB) ASSEMBLY, DISPLAY

SENSOR ASSEMBLY

SWITCH ASSEMBLY, MICRO

PWB(PCB) ASSEMBLY, MAIN

DH300EY7

6411A20001Z

4681A20040Q

0CZZA20005J

2520UCBS005

6750U-L082A

6871A20600A

6877A30013L

6600A30003C

6871A20888A

PART NO.

NO.

—10—

• MODEL :DH400MY7/LD40Y7

Q'TY

PER SET

RE-

MARKS

DESCRIPTION

POWER CORD ASSEMBLY

SWITCH, ROCKER

MOTOR ASSEMBLY

CAPACITOR

COMPRESSOR (ROTARY), SET

OLP (ASSEMBLY)

PWB(PCB) ASSEMBLY, DISPLAY

SENSOR ASSEMBLY

SWITCH ASSEMBLY, ROTARY

SWITCH ASSEMBLY, MICRO

PWB(PCB) ASSEMBLY, MAIN

DH400MY7/LD40Y7

6411A20001Z

6600FX5001G

4681A20040Q

0CZZA20005N

2520UCAS003

6750U-L103A

6871A20289B

6877A30013L

6601A30006A

6600A30003C

6871A10142A

PART NO.

S: SERVICE PARTS A: ALTERNATE PARTS N: NOT SERVICE PARTS

NO.

—11—

• MODEL :DH404EY7/DH400EY7/LD40EY7

Q'TY

PER SET

RE-

MARKS

NO.

POWER CORD ASSEMBLY

MOTOR ASSEMBLY

CAPACITOR

COMPRESSOR,SET

OLP

PWB(PCB) ASSEMBLY,DISPLAY

SENSOR ASSEMBLY

SWITCH ASSEMBLY,MICRO

PWB(PCB) ASSEMBLY,MAIN

S: SERVICE PARTS A: ALTERNATE PARTS N: NOT SERVICE PARTS

DESCRIPTION

DH404EY7/DH400EY7

PART NO.

LD40EY7

6411A20001Z

4681A20040Q

0CZZA20005N

TBZ30871801

EAF35787201

6871A20600A

6877A30013L

6600A30003C

6871A20888A

—12—

• MODEL :DH500MY7

Q'TY

PER SET

RE-

MARKS

DESCRIPTION

POWER CORD ASSEMBLY

SWITCH, ROCKER

MOTOR ASSEMBLY

CAPACITOR

COMPRESSOR (ROTARY), SET

OLP (ASSEMBLY)

PWB(PCB) ASSEMBLY, DISPLAY

SENSOR ASSEMBLY

SWITCH ASSEMBLY, ROTARY

SWITCH ASSEMBLY, MICRO

PWB(PCB) ASSEMBLY, MAIN

DH500MY7

6411A20001Z

6600FX5001G

4681A20040J

0CZZA20005J

2520UCBA010

6750U3L001A

6871A20289B

6877A30013L

6601A30006A

6600A30003C

6871A10142A

PART NO.

S: SERVICE PARTS A: ALTERNATE PARTS N: NOT SERVICE PARTS

NO.

—13—

• MODEL : DH504ELY7

WIRINGWIRING

BK(HI)

RD(LOW)

MOTOR

K B

O.L.P

BK(BR) (L)

OR(COM)

GN/YL

WH(BL) (N)

GN/YL

COMP.

RO T

ICA

P AC

RO T

ICA

P AC

DIA GRAMDIA GRAM

OL-Y

AC1

AC2

FUSE 250V T3.15A

MAIN PCB

IH-YR

POWER TRANS

CN-SEN

CN-FAN

CN-

RY-COMP

4 3

PSID-NC

BUCKET S/W

HUMIDITY SENSOR

THERMIS

TOR

3854A20247V3854A2024

B.C.P YALPSID

NO.

DESCRIPTION

PART NO.

DH504ELY7

POWER CORD ASSEMBLY

MOTOR ASSEMBLY

CAPACITOR

COMPRESSOR (ROTARY), SET

OLP.

PWB(PCB) ASSEMBLY, DISPLAY

SENSOR ASSEMBLY

SWITCH ASSEMBLY, MICRO

PWB(PCB) ASSEMBLY, MAIN

COIL ASSEMBLY, SOLENOID

6411A20001Z

EAU32357501

0CZZA20005J

3H00660V

2520UCBA010

6750U3L001A

6871A20600A

6877A30013L

6600A30003C

6871A20888A

6421A20003K

S: SERVICE PARTS A: ALTERNATE PARTS N: NOT SERVICE PARTS

Q'TY

PER SET

1 S

RE-

MARKS

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