Sharp WH-237DP, WH-247D Service Manual

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SHARP SERVICE MANUAL

ELECTRIC WATER HEATER

MODELS

WH-237DP WH-247D

In the interests of user-safety (Required by safety regulations in some countries) the set should be restore to its original condition and only parts identical to those speciﬁ ed should be used.

TABLE OF CONTENTS

PARTS IDENTIFICATION AND SPECIFIC INFORMATION ..............................................

Page

EXTERNAL DIMENSION ...................................................................................................

CAUTION FOR USE ..........................................................................................................

HOW TO USE ....................................................................................................................

WIRING DIAGRAM ............................................................................................................

INST ALLA TION ADVICE ....................................................................................................

ELECTRIC WIRE CONNECTIONS ....................................................................................

SHOWER SET ....................................................................................................................

REPLACING METHOD FOR MAIN PARTS .......................................................................

TROUBLESHOOTING .......................................................................................................

CIRCUIT DIAGRAM (PCB-A) .............................................................................................

SERVICE PARTS LIST .......................................................................................................

SHARP CORPORATION

5-8

8-10

11-16

19-21

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Shower head

Shower stand

PARTS IDENTIFICATION

Main breaker

Power cord and ground wire

Body ELB lamp Power lamp Control lamp Display

Temperature control button

ELB button

Shower hose

Breaker angle support

Model Rated voltage

Rated frequency Power consumptions Water supply system

Water temperature control

SPECIFIC INFORMATION

WH-237DP WH-247D

220

3,500

Single point

Electronic control automatic constant

temperature - approximately 32

Power SW. button

Water volume knob

Main water valve

4,500

C - 48oC

Minimum pressure Maximum pressure Product dimension (W x H x D) IP number Weight (kg)

0.02 MPa (0.21 Bar)

0.34 MPa (3.39 Bar) 236 x 378 x 86

IP25

2.4

Note : Temperature of inlet water is approximately 25oC and ﬂ ow rate is 2.3 liters/min.

: 1 MPa (Megapascal) = 10.2 Kilograms/Square centimeter.

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EXTERNAL DIMENSION

236

378

Front

(Unit in mm.)

Side

Fig. 1

CAUTION FOR USE

1. Always turn off the main breaker before making any repairs to your electric water heater.

2. Do not install water valve or faucet at hot water outlet. (Fig. 2)

3. Do not spray water on this electric water heater or put water towels on it. (Fig. 3)

4. Do not cover the shower head with hands or towels or fold the shower hose. (Fig. 4)

Water valve

Water inlet

Fig. 2 Fig. 3 Fig. 4

Water outlet

5. If you see the light within your house is ﬂ ashing from time to time while showering due to irregularity of electricity, the water temperature may change and this is not unusual.

6. When using other valves with the water heater (sharing the main water pipe), the water pressure will be reduced and water will ﬂ ow slowly, therefore the temperature will rise temporary before revert back. This is not a heater malfunction. Please turn the water volume knob or press the temperature volume button appropriately.

7. In the event of thunder and lightning storm, turn off the main breaker to prevent the damage that may occur on this appliance.

8. Close supervision is necessary in order to check on the water temperature when used by children, elderly, patients and disabled person.

9. In case of water outage, press the Power SW. button and check whether the power lamp (red) and the ELB lamp indicator (green) are off (to avoid water automatically ﬂ owing when you are not in the bathroom after tap water ﬂ ow resumes).

10. While we using a product if that is stop working immediately as we do not know the cause, please inform the SHARP service center for proceed to repair.

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HOW TO USE

BEFORE USE

The installation work is to be done by the Authorized “SHARP” Dealer. The electric home shower unit must earthed. Special skill is required. Never try to repair the unit by yourself.

1. Open the main water valve from the home main water pipe.

2. Open the main breaker switch.

3. Push up ELB breaker to activate the heater electrical system.

4. Press the Power SW. button on the heater. Normal temperature water will ﬂ ow and the ELB lamp indicator (green) will illuminate.

5. Turn the water volume knob clockwise or counterclockwise to increase or decrease water from the shower head (see the water volume knob detail in water temperature adjustment).

6. Press the temperature button to adjust the desired temperature. The power lamp (red) will be illuminated and the warm water will ﬂ ow from the shower head (see the detail in water temperature adjustment).

7. After use, press the Power SW. button to shut the heater off and water will stop ﬂ owing and the electricity will be cut. For the next use, just simply press the Power SW. button and the water will ﬂ ow at the prevailing volume and temperature. Note : In case of electricity or tap water outage while using, always press the Power SW. button before leaving the bathroom.

ADJUSTMENT WATER TEMPERATURE

1. Using the temperature control button.

1.1. The heater will automatically set the default temperature when starts. The factory value is 34oC which can be modiﬁ ed according to user preferences by adjust the water temperature to the desired temperature and lock the temperature by holding any of the temperature control button for 3 seconds. The temperature indicator will ﬂ ash 3 times. * Do not set to high default temperature as children may turn on the heater by themselves and get hurt.

1.2. Changing from the default temperature can simply be done by pressing the temperature control button up and down to adjust the temperature according the preference, which can be set between 32oC - 48oC. When pressed, the “beep” tone will be heard and the temperature will change by a degree.

1.3. The temperature indicator displays the preset temperature.

ELB lamp

Power lamp

Control lamp

Temperature button

ELB checker button

1.4. The new temperature can be adjusted anytime. If you do not want to bath at the default temperature, see section 1.2.

1.5. The heater will remember the preset temperature during the bath though the heater has been turned off temporary. (The heater will revert back to the default temperature if it is off for more than 2.5 minutes).

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1.6. If the control lamp is orange means that the water temperature is automatically controlled. Illuminated : The water temperature will be controlled at the preset level. Flash : Water ﬂ ows too much and the warm water temperature is out of control. If the incoming water temperature upward then press the temperature button and the control lamp will illuminate.

1.7. If the control lamp ﬂ ash, the water volume knob should be reduced by turning the water volume knob counterclockwise until the lamp stops ﬂ ashing. (If the incoming water ﬂ ows too much and the warm water temperature is out of control then the control lamp will ﬂ ash).

1.8. Bath a cold water by pressing the temperature button until the temperature is lower then 32 The indicator will display OF and ﬂ ashes 3 times. Press the temperature button again when OF is ﬂ ashing and OF (off) will stop ﬂ ashing and the (orange) lamp will also be off.

2. Using the water volume knob. Turn the button clockwise to increase water volume knob.

Turn the button counterclockwise to decrease volume.

3. Using the Power SW. button. Press the button and the ELB lamp indicator will illuminate and water will ﬂ ow from the shower

head, press the button again to turn off the heater.

WIRING DIAGRAM

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INST ALLATION ADVICE

1. BEFORE INSTALLATION

Please check water pressure before operating this unit. Minimum water pressure : 0.02 MPa (0.21 Bar). Maximum water pressure : 0.34 MPa (3.39 Bar). Please follow the picture below to check water pressure. Water shall overﬂ ow at the end of the tube within 2.3 meters above the faucet.

About 2.3 meters

Fig. 5

2. INSTALLATION THE UNIT

2.1. Preparing installation area. The unit must be mounted to the wall in a vertical position only. (See in the picture)

Leave this unit away from the wall for both sides more than 200 millimeters.

The minimum height of 1.50 meters to the lower edge of the unit must be observed.

Fig. 6

2.2. Removing the unit cover.

Remove the screw underneath the unit. Open the cover by lifting from the bottom.

Screw

Over 1.50 meters

Fig. 7

Fig. 8

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2.3. Mounting the unit to the wall. Drill two 6 millimeters holes in the wall with approximately 25 millimeters in depth. Install wall anchors into the holes. Screw the top wall anchors, leave screw length around 8-10 millimeters and hang the unit on the screw then marked the position in order to drill another 2 holes at the bottom, drill the holes and install the rest of wall anchors then fasten all of 4 screws.

6 mm.

25 mm.

Fig. 9

2.4. Assemble the cover with the heater. Place the cover for the space palm to plug the wire pole the same place on the circuit. Assemble the cover from the bottom of the heater and push tight on the top of cover.

Tighten screws to attach the cover with the heater to the same position.

PCB control

Back cover

Pull

Put in

Wire connect

Fig. 11

Fig. 10

2.5. The shower assembly. The joint the shower hose counterclockwise with the shower head.

Notiﬁ cation in connecting the shower hose.

Shower head

Joint

Shower hose

Fig. 12

Connect to the shower head.

Connect to the unit.

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2.6. Installation the shower stand. Ensure that the shower stand located in the level that the top part of the shower head is not

higher than the top part of the unit when hanging the shower head. (See in the picture) The angle of shower head holder can adjust into 2 levels.

Fig. 13

3. PIPING INSTALLATION

1. Connection point between the unit and the water volume knob and twist the shower hose by hands until it tight. Do not use any tools during assembly because it may cause the damage to plastic components.

2. Tighten the connection into the thread located at the bottom of the water volume knob. Force gauge do not exceed 40 kgf.cm.

3. Connect water inlet pipe and water outlet pipe as shown in the picture.

Shower head

Water inlet

O-ring ﬁ xer

Filter

Water volume knob

Shower hose

O-ring

Use pipe at least 15 cm. in length

Main water valve

Fig. 14

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ELECTRIC WIRE CONNECTIONS

1. Be sure to cut off the main power supply switch every time before starting any electrical work Use dual insulated wire with at least 4 square meters cross-section (WH-237DP).

Use dual insulated wire with at least 6 square meters cross-section (WH-247D). Connect electric wire to the unit from the main switch board through the main breaker which is located outside the bathroom. Wire connection must be permanent.

Bathroom

Main breaker

Fig. 15

Earth ground

2. Electric wire connection to the unit can be done by 2 methods. (as illustrated) Drill a small hole at the

rubber to insert the wire on side or at the rear of the unit.

Ground wire

Connect the wire on side of the unit.

Fig. 16

Connect the wire at rear of the unit.

Ground wire

Peel the wire and connect to the ELB checker by connecting the high voltage cable to the terminal “L” and connect neutrons wire into the terminal “N”. Use screwdriver to tighten the wires. (Force gauge approximately 12 kgf.cm). If the wires are connected into the wrong terminal, the unit will not work properly. It may result in damage to the circuit or may cause danger to the user.

12 mm.

20 mm.

(Force gauge 12 kgf.cm)

Fig. 17

30 mm.

Ground wire

50 mm.

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3. The ground wire must be connected to grounding point on the unit. Grounding process.

Ground rod installation, select the area where moisture stored in the soil and away from ﬂ ood area with no sand or limestone. The diameter of ground rod is not less than 16 millimeters and the length is not less than 240 centimeters. Embed the ground rod at least 30 centimeters in depth from ground surface.

4. Ground resistance must be less than 5 ohm.

5. After grounding process is completed, if ground resistance is higher than 5 ohm, additional ground

rod must be embedded. Leave the additional one away from the previous ground rod at least equal to the length of ground rod. Connect them together in parallel.

Tools for embedded

At least 30 cm.

Ground surface

Ground rod

Fig. 18

SHOWER SET

Shower heads allow users to adjust into 3 types by simply twisting the shower head cover as show the picture.

JET TYPE

COMFORT TYPE

SPRA Y TYPE

LEFT

RIGHT

Match the sign with you designed type.

Fig. 19

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REPLACING METHOD FOR MAIN PARTS

REMOVE OF SHOWER HOSE

1. Turn out the joint body between the body with the shower hose manually. Never use other tools to avoid breaking plastic parts.

Body

Shower hose

Fig. 20

REMOVE OF BODY

1. Remove the screw underneath the unit.

2. Open the cover by lifting from the bottom.

3. Disconnect the connecting wire for PCB from the PCB control.

4. Now the body is free.

Screw

Body

Back cover

Fig. 21

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REMOVE OF POWER SWITCH BUTTON

1. Remove the body in accordance with “REMOVE OF BODY”.

2. Push the claws of the guide pin by ﬂ at screwdriver and remove the guide pin from the body.

3. Now the power SW. button is free.

Body

Guide pin

Power SW. button

Remove the guide pin

Flat screwdriver

Fig. 22

REMOVE OF PUSH SWITCH SET

1. Remove the body in accordance with “REMOVE OF BODY”.

2. Remove 2 screws holding the push SW. set to the back cover.

3. Now the push SW. set is free.

Body

Micro SW.

Back cover

Push SW. set

Screw

Fig. 23

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REMOVE OF TRIAC

1. Remove the body in accordance with “REMOVE OF BODY”.

2. Disconnect 3 lead wires from the triac.

3. Remove 2 screws holding to the heater tank ass’y.

4. Now the triac is free.

Breaker lead wire

Screw

Triac

White lead wire Brown lead wire

Triac lead wire

Heater tank

Fig. 24

REMOVE OF REED SWITCH

1. Remove the body in accordance with “REMOVE OF BODY”.

2. Disconnect reed SW. lead wires from the PCB-1.

3. Remove 2 screws holding the reed SW. from the body valve.

4. Now the reed SW. is free.

Note : Tighten the mounting screws of the reed switch at the speciﬁ ed torque ; 3-4 kgf.cm.

Screw

Reed SW.

Reed SW. lead wire

Body valve

Fig. 25

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REMOVE OF BODY VALVE ASS’Y AND WATER OUTLET

1. Remove the body in accordance with “REMOVE OF BODY”.

2. Remove the reed SW. in accordance with “REMOVE OF REED SWITCH”.

3. Remove the push SW. set in accordance with “REMOVE OF PUSH SWITCH SET”.

4. Detach 2 clamping springs holding the body valve ass’y and the water outlet to the heater tank ass’y.

5. Remove 2 screws holding the body valve ass’y.

6. Remove 2 screws holding the water outlet.

7. Now the body valve ass’y and the water outlet are free.

Clamping spring

Heater tank

Screw

Water outlet

Screw

Fig. 26

Body valve ass’y

Back cover

REMOVE OF HEATER TANK ASS’Y

1. Remove the triac in accordance with “REMOVE OF TRIAC”.

2. Remove the body valve ass’y and the water outlet in accordance with “REMOVE OF BODY VALVE ASS’Y and WATER OUTLET”.

3. Remove the screw to L-Wire Earth from heater tank ass’y.

4. Remove the screw holding cable tie from the heater tank support.

5. Remove 2 screws holding triac lead wire (brown) and thermostat lead wire (yellow) to the heater tank ass’y.

6. Remove 2 screws holding the thermostat to the heater tank ass’y.

7. Remove the thermistor ass’y from the heater tank ass’y.

8. Now the heater tank ass’y is free.

Screw

Cable tie

Screw

Triac lead wire brown

Lead wire brown

Lead wire yellow

Screw

L-wire earth

Heater tank

Heater tank support

Thermistor ass’y

Breaker lead wire black

Thermostat lead wire yellow

Screw

Thermostat

Back cover

Fig. 27

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REMOVE OF PCB CONTROL

1. Remove the body in accordance with “REMOVE OF BODY”.

2. Pull out all lead wires from the PCB control.

3. Remove 3 screws holding the PCB control.

4. Now the PCB control is free.

Fig. 28

Screw

PCB control

Back cover

REMOVE OF DISPLAY BOARD

1. Remove the body in accordance with “REMOVE OF BODY”.

2. Pull out the connecting wire for PCB from the display board.

3. Remove 2 screws holding display board to digital key top.

4. Now the display board is free.

Digital key top

Display board

Body

Connecting wire for PCB

Screw

Fig. 29

Page 16

REMOVE OF BREAKER

1. Remove the body in accordance with “REMOVE OF BODY”.

2. Remove split pin holding the breaker angle support to the breaker.

3. Remove 2 screws holding 2 breaker lead wires to the breaker.

4. Remove 2 screws holding the breaker to the back cover.

5. Now the breaker is free.

Split pin

Breaker angle support

Breaker lead wire

Fig. 30

Screw Breaker lock

Breaker

Back cover

ERROR DISPLAY

Display shows and sounds short beep 10 times. Then the power lamp is not lights up, ELB lamp

is lights up. Possible cause : The water is not supply or the water pressure is too low. Display shows and sounds short beep 2 times, long beep 1 time and so on until 8 times. Then the power lamp is not lights up, ELB lamp is lights up. Possible cause : The water pressure is too low and the temperature is too high in the heater tank. So that the thermostat is cut off. Display shows and sounds long beep 5 times. Then the power lamp is not lights up, ELB lamp is lights up. Possible cause : The temperature is too high in the heater tank. So that thermostat is cutoff.

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TROUBLESHOOTING

Problem Possible cause Corrective action

Water is not hot.

- ELB lamp is not lights up.

- Power lamp is not lights up.

- Control lamp is not lights up.

Water is not hot.

- ELB lamp is lights up.

- Power lamp is not lights up.

- Control lamp is not lights up. Water is not hot.

- ELB lamp is lights up.

- Power lamp is lights up.

- Control lamp is blink or lights up. Water is not hot.

Power switch button is defected.

ELB breaker is cut off or defected.

Main SW. is closed. Thermostat trip (Cut off). Reed SW. is defected. Body valve ass’y is defected. PCB control is defected. Triac ass’y is defected. PCB control is defected.

PCB control is defected.

Check or replace the mechanical parts in power switch button. Check electrical leakage point from any lead wire or replace the ELB breaker. Open main SW. Reset thermostat. Replace the reed SW. Check or replace the body valve ass’y . Replace PCB control. Replace triac ass’y. Replace the PCB control.

Replace the PCB control.

- ELB lamp is lights up.

- Power lamp is lights up

- Control lamp is not lights up. Press the Temp. control button to high level water is not hot.

Water ﬂ ow out from shower ass’y is too low.

Water is not ﬂ ow out from shower ass’y.

PCB control is defected.

O-ring is clogged. Shower ass’y is clogged. Main water valve is open too low. Main water valve is closed. Water volume is closed. Power switch button is defected.

Replace the PCB control.

Check and clean the O-ring. Check and clean the shower course. Open main water valve to increase. Open main water valve. Open water volume. Check or replace the mechanical parts in power switch button.

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CIRCUIT DIAGRAM (PCB-A)

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SERVICE PARTS LIST

Model WH-237DP

REF. NO

1-1 71P107 INSTRUCTION BOOK 1 1-2 71P100 SET PACKING CASE 1 1-3 71P101 CARTON BOX 1 1-4 71P102 NAME PLATE 1 1-5 71P104 WIRING DIAGRAM STICKER 1 1-6 71J105 LOWER PAD 1 1-7 71J106 UPPER PAD 1

2-1 71P200SET BODY SET 1 2-2 71M219 GUIDE PIN 2 2-3 71P212 POWER SW. BUTTON 1 2-4 71M307 GUIDE PIN SPRING 1 2-5 71P203 ELB KNOB 1 2-6 7N6182 BREAKER ANGLE SUPPORT 1 2-7 7N706 SPLIT PIN 1 2-8 71J214 BREAKER LOCK 2

2-9 7A220 CLAMPING SPRING 2 2-10 7K102 WATER OUTLET 1 2-11 7D9241 PLUG 2 2-12 71J201 BACK COVER 1 2-13 7D601 AC LINE CLAMP 1 2-14 7N608 RUBBER CAP 1 2-15 71M216SET PUSH SWITCH SET 1 2-16 71M410ASY BODY VALVE ASS’Y 1 2-17 71J305 HEATER TANK SUPPORT 1 2-18 71M301SET HEATER TANK SET 1 2-19 71J306 CABLE TIES 1 2-20 71C204ASY SHOWER ASS’Y 1 2-21 7A9012ASY SHOWER HOSE ASS’Y 1 2-22 7A910 SHOWER STAND 1 2-23 7G801ASY WATER INLET BODY ASS’Y 1 2-24 7A912 O-RING FIXER 1

3-1 7A605 BREAKER 220V, 30A 1

3-2 7H625 PCB CONTROL 1

3-3 7H630 CONNECTING WIRE FOR PCB 1

3-4 7U626 DISPLAY BOARD 1

3-5 71M411 BREAKER LEAD WIRE BLACK 1

3-6 7D2101 MICRO SWITCH 1

3-7 7R405 REED SWITCH ASS’Y 1

3-8 71P412 LEAD WIRE FOR PCB - A CN3 1

3-9 71J407 TRIAC LEAD WIRE BROWN 1 3-10 7R128ASY THERMISTOR ASS’Y 1 3-11 7N1261 THERMOSTAT 85 3-12 71M410 THERMOSTAT LEAD WIRE YELLOW 1 3-13 7G127ASY TRIAC ASS’Y 600V, 25A 1 3-14 7N509 LEAD WIRE EARTH 1

PARTS CODE

(FEC)

DESCRIPTION Q’TY PRICE

PRINTING & PACKAGING MATERIAL

MECHANICAL PARTS

ELECTRIC PARTS

Page 20

Model WH-247D

REF. NO

1-1 71P107 INSTRUCTION BOOK 1 1-2 71R100 SET PACKING CASE 1 1-3 71R101 CARTON BOX 1 1-4 71R102 NAME PLATE 1 1-5 71P104 WIRING DIAGRAM STICKER 1 1-6 71J105 LOWER PAD 1 1-7 71J106 UPPER PAD 1

2-1 71R200SET BODY SET 1 2-2 71M219 GUIDE PIN 2 2-3 71M212 POWER SW. BUTTON 1 2-4 71M307 GUIDE PIN SPRING 1 2-5 71J203 ELB KNOB 1 2-6 7N6182 BREAKER ANGLE SUPPORT 1 2-7 7N706 SPLIT PIN 1 2-8 71J214 BREAKER LOCK 2

2-9 7A220 CLAMPING SPRING 2 2-10 7K102 WATER OUTLET 1 2-11 7D9241 PLUG 2 2-12 71J201 BACK COVER 1 2-13 7D601 AC LINE CLAMP 1 2-14 7N608 RUBBER CAP 1 2-15 71M216SET PUSH SWITCH SET 1 2-16 71M410ASY BODY VALVE ASS’Y 1 2-17 71J305 HEATER TANK SUPPORT 1 2-18 71N301SET HEATER TANK SET 1 2-19 71J306 CABLE TIES 1 2-20 71A204ASY SHOWER ASS’Y 1 2-21 7A901ASY SHOWER HOSE ASS’Y 1 2-22 7A910 SHOWER STAND 1 2-23 7G801ASY WATER INLET BODY ASS’Y 1 2-24 7A912 O-RING FIXER 1

3-1 7A605 BREAKER 220V, 30A 1

3-2 7J625 PCB CONTROL 1

3-3 7H630 CONNECTING WIRE FOR PCB 1

3-4 7U626 DISPLAY BOARD 1

3-5 71N411 BREAKER LEAD WIRE BLACK 1

3-6 7D2101 MICRO SWITCH 1

3-7 7R405 REED SWITCH ASS’Y 1

3-8 71R412 LEAD WIRE FOR PCB - A CN3 1

3-9 71K407 TRIAC LEAD WIRE BROWN 1 3-10 7R128ASY THERMISTOR ASS’Y 1 3-11 7N1261 THERMOSTAT 85 3-12 71N410 THERMOSTAT LEAD WIRE YELLOW 1 3-13 7J127ASY TRIAC ASS’Y 600V, 25A 1 3-14 7P509 LEAD WIRE EARTH 1

PARTS CODE

(FEC)

DESCRIPTION Q’TY PRICE

PRINTING & PACKAGING MATERIAL

MECHANICAL PARTS

ELECTRIC PARTS

Page 21