Midea MWH-38EU3-GR User manual

Instant Electric Water Heater
The diagram above is just for reference. Please take the
appearance of the actual product as the standard.
Instruction Manual
For Model:
Thank you very much for purchasing our water heater. Before installing and operating your
water heater, please read this manual carefully and keep it for future reference.
The user needs to test the built-in earth leakage circuit breaker(ELCB) at least once a month.
MWH-38EU3-GR
MWH-38EU5-GR
MWH-38EU3-RS-GR
MWH-38EU5-RS-GR

1
TABLE OF CONTENTS
TITLE PAGE
1.Cautions ...........................................................................................................................(2)
2.Product introduction .........................................................................................................(3)
3.Unit installation .................................................................................................................(7)
4.Methods of using ............................................................................................................(10)
5.Maintenance................................................................................................................... (11)
6.Troubleshooting..............................................................................................................(12)
Sincerely thank you for selecting our electric water heater. Please read this manual carefully
before use; correctly grasp the methods for installation and use of this electrical water heater, to
make full use of its excellent performances. Please do preserve the instruction manual for future
reference.

2
This water heater is for household, and it can be installed wherever place that need hot water.
Plug is not used for this water heater; this water heater must be connected directly with power
switch that comes with leakage-protection. Please distinguish live line (red/brown), neutral line
(blue) and earth line (green/yellow) during installation.
Do check whether the amperes of the household wiring enough before installation, and
dedicated circuit must be used when installation.
Before installing this water heater, check and confirm the earth electrode on the socket is reliably
earthed, without electricity.
The hot water from the water heater may cause scald, please test the temperature of the hot
water before use.
The distance between water heater installed and water output should be as nearby as possible
to avoid loss of heat.
The electric water heater may be damaged if the water hardness is too high. To ensure longer
product lifespan, please install and put it into use on condition that the local water hardness is
less than 450mg/L (CaCO3)
In time of lightning/thunder, switch “Off” the Miniature Circuit Breaker (MCB) in advance to
protect the water heater against possible damage.
Inspection on the built-in ELCB (once a month) to avoid a hazard to users such as damage to
property, serious injury or death.
Do cut-off power supply before any maintenance. Any maintenance or adjustment towards this
product by non-professional is highly prohibited.
The damage power cord must be replaced by a good power cord provided by the manufacturer,
and the replacement should be done by a qualified technician or engineer or professionals of
the similar products.
In order to avoid a hazard due to inadvertent resetting of the Earth Leakage Circuit Breaker
(ELCB), this appliance must not be supplied through an external switching device, such as timer
or connected to a circuit that is regularly switched “On” and “Off” by the utility.
Water heater is equipped with adjustable flow capacity safety valve. For safety use, please do
not change its installation location and do not block its water outlet.
For any improper installation and incorrect operation of this product, our company will not be
liable for any responsibility.
This water heater can be used for other purpose, eg. Washing hands, dishes or foods, and so on.
(Multi directional water supply is not available).
When the shower is used by someone such as child, old person, sick person and physical
handicapped person, the concern person is kindly requested to pay attention and check the
shower temperature by using hand from time to time.
To prevent personal injury, injury to others and property damage, the instructions below must be
followed. Incorrect operation due to failure to follow instructions will cause harm or damage.
WARNING
Special Cautions
The water heater should be earthed before use. Please ensure that the resistance of
household earth wire is <4Ω.Using water heater without earthed is highly prohibited.
!
1. CAUTIONS
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2. PRODUCT INTRODUCTION
2.1 Technical Performance Parameters
Model
Rated Voltage
Rated Frequency
Rated Power
Rated Current
Dia. Of Wire Core
Air Switch
Rated Pressure
Minimum Flow Rate
Minimum Pressure
Maximum Pressure
Protection Class
Water Proof Class
Products Size
Knob Quantity
1.5 Liters/minute
IP25
3800W
0~16A
2.5mm²
≥20A
240V~
50Hz
0 MPa
0.03 MPa
0.3 MPa
I
232×406×103 mm
1
MWH-38EU3-GR MWH-38EU3-RS-GR
MWH-3EU5-GR MWH-3EU5-RS-GR

4
2.2 Parts Identification
PRODUCT STRUCTURE FOR
MWH-38EU5-GR MWH-38EU5-RS-GR
PRODUCT STRUCTURE FOR
MWH-38EU3-GR MWH-38EU3-RS-GR
Silicon control
Flow Sensor
Flow Sensor
DC pump
Water inlet
Thermal
Terminal Block
Terminal Block
cut out
Main control board
Main control
board
Temperature
sensor
Temperature
sensor
Tank
Tank
Water outlet
Display board
Silicon control
Water inlet
Thermal
cut out
Water outlet
Display board

2.3 Internal Wire Diagram
5
WIRING DIAGRAM FOR
MWH-38EU3-GR MWH-38EU3-RS-GR
WIRING DIAGRAM FOR
MWH-38EU5-GR MWH-38EU5-RS-GR
⑧：DC Pump
⑦：Display Board
⑥：Main Control Board
⑤：Silicon Control
④：Flow Switch
③：Heating Elements
②：Terminal Block
①：Thermal cut out
3
7
5
1
2
N
PE L
G
T1
T2
8
4
6
NL
T1 G
N
CN1
CN8
CN5
CN6
T1
CN2
CN4
RL1RL2
CN2
7
CN2
⑦：Display Board
⑥：Main Control Board
⑤：Silicon Control
④：Flow Switch
③：Heating Elements
②：Terminal Block
①：Thermal cut out
3
5
1
2
N
PE L
G
T1
T2
4
6
NL
T1 G
N
CN1
CN8
CN5
CN6
T1
CN4
RL1RL2
7

6
3.1 Installation Instruction
3.2 Power Cord Installation
Check the capacity of power circuit;
Power cord installation;
Water heater installation;
Plumbing connection;
Power supply connection;
①
②
③
④
⑤
Water Supply.
Step 1 Step 2
⑥
3. UNIT INSTALLATION
Step 3 Step 4
Step 5 Step 6
Remove the screws at the bottom of the unit. Lift
up the Main Switch Knob and Power Knob to
make it free. Remove the front plate gently.
Gash the middle of the film of the power cord
jacket with a sharp knife in order to put into
power lines.
Tighten the wire-pressing plate with screws to
primary position, ensure that the power cord not
be pulled out more than 60N.
Remove the power cord wire pressing plate and
keep the screws.
Screw the power cord into the jacket for
installation of wire pressing plate.
Connect the power cord to wiring terminals; the
method is as shown in picture.

7
3.3 Water Heater Installation
3.4 Plumbing Connection
①
②
③
④
⑤
NOTE
The installation position of neutral line (blue), live line (brown/red) and earth line
(green/yellow) should be corresponding to the other end on wiring terminals.
Make sure the distance between the unit and surrounding wall is not less than 300mm, so
that to have enough space for maintenance purpose.
Determinethe position of four fixing screws (attached with the unit), make four holes with
corresponding depth in the wall by means of a drill and drive a wall plug into the hole.
Drive in the screws on the top and ensure certain distance between screw head and wall
(See Fig.1)
Mount the unit on the wall and tighten with two screws at bottom, connect the wires and
install top cover with the screws.
Determine installation position of the unit according to length of power cord / position
of air switch (Distance between bottom and floor should be ≥1.6m).
①
②
Shower flexible tube should be connected with water outlets and shower head separately,
attached sealing ring should be used at end face.
Water valve with filter should be installed at water inlet of the unit, sealing ring with filter
should be used at end face. (See Fig.2).
(Fig.1)
WARNING
Metallic / chromed hose and conductive control valve shall not be used.
!
150
295
10

8
3.5 Power Supply Connection
3.6 Water Supply
①
②
③
Choose air switch with leakage protection according to power of water heater;
When connecting the water heater to electric network, please pay attention to connect live
line (red/brown), neutral line (blue) and earth line (yellow/green) with corresponding line in
electric network.
Adjust power selection knob to“OFF”;
(Fig.2)
NOTE
Water flow adjusting valve with filter must be used when install the unit. Blue marker
stands for water inlet, red marker stands for water outlet. Do not overexert to avoid
damaging the water heater.
NOTE
A private power cord should be used for this unit. After connecting to electric network,
please check the earth condition and make sure the earth resistance is <4Ω.
Water flow
adjusting
valve with
filter
Power
knob
wire
L(Red)
N(Blue)
E(Yellow/Green)
Circuit
breaker
To main line
Valve
Valve
Outlet Inlet
After all the plumbing is finished connecting, open water inlet valve of the product and supply
water to the unit to drain away air inside until there is stable water flow comes out from shower
head. Check whether there is leakage at joints or not. If there is, check whether the connecting
parts are fastened or not, then re-supply water.

9
4.1 The display screen function display
4. METHODS OF USING
Functional description
Function
Safety sign
The “Safety sign ” is displayed normally，Machine
trouble-free,If “Safety sign ” twinkling flicker, is it means
the heater cannot be connected to the Ground firmly.
The function icon displayed，water heater not heated,
the outlet water is cold.
The function icon displayed，the water heater is in the
morning model,the default set temperature 40°C.
The function icon displayed，the water heater is in the
night model,the default set temperature 36°C.
The function icon displayed，the water heater is in the
night model,the default set temperature 36°C.
Temperature unit
Power icon displays power output status, Max for full
power.
Cold water model
Morning model
Night model
Display icon
Temperature value
Unit
Power icon

10
4.2 The button function
4.3 Knob function
4.4 Functional operation
NOTE
In the heat state,when the outlet temperature is greater than 55℃, The thermal cut out
will cut off,and the water heater stops working.When the outlet temperature is less than
40℃, the water heater will work again.
Leakage circuit
detection
Press “Test” button,water heater leakage circuit detection.
Repeat press the button,Water heater recovery.
Functional description
Function
Display icon
Pump function
Mode selection
Press “Pump” button,the pump will be turned on or off.
Press “Mode” button,the water heater will switch in
“Cold ” “Morning” “Night” these three modes.
Rotate the knob to adjust the power, increase the power clockwise until the maximum,
counterclockwise to reduce the power, until the minimum.
4.4.1 Temperature regulation function
4.4.2 Pump operation（FOR MWH-38EU3-**）
4.4.3 Mode parameter setting
Turn on the power,water heater initial set temperature 38 ℃,rotating knob to adjust temperature,
temperature allows the adjusting range of 30 ℃to 48 ℃.
Raise the temperature：clockwise rotating the knob，the temperature is raise，until 48℃.
Reduce the temperature：Counterclockwise rotating the knob，the temperature is reduced,
until 30 ℃.
Open punp：Press “Pump” button,the pump will begin to work.
Close the punp：Press “Pump” button,the pump will stop working.
When the water flow does not meet the requirements of the water heater, press "pump" 3s ，
pump will be force to start，the pump will continue to work，when the water flow reaches the
requirements of the water heater. If the water flow still cannot meet the requirements of the
water heater, the pump will be closed.
In the current mode, the long press "mode" button 3s,the ystem enters the parameter setting
state,and screen will flicker. Turn the knob to set the temperature to the desired value，Press
the "mode" button again and the parameters are set successfully.
①
①
②
②
③

11
4.5 Operating Of The Unit
Leakage Testing
To Adjust Water Flow
Switch on the power supply, screen lights up and the digital peripheral strokes
turn. the unit will take self-inspection for 2s, “ELCB”; When the water flow
exceeds 1.5L/min,rotate the knob clockwise to switch on heating power rotate
switch, heating indicator light will be on, the unit start to work.
Rotate the handle of water flow adjusting valve to adjust the water flow.
Electricity Leakage Protection
When the electricity leakage testing circuit is working normally, if the leakage current is bigger than
certain value between 7.5mA and 15mA,
the display will closed,no heating; it can only be used after
the failure is excluded. (When electricity leakage is tested, red and green indicator lights are all off,
stop heating and close the pump system.)
To Adjust Water Temperature
Rotate the handle of water flow adjusting valve to adjust to proper water flow. Adjust power by rotating
knob, clockwise rotate, power will be increased and water temperature increase accordingly or vice
versa.
NOTE
For first time using, ensure electrify after the unit is filled fully with water and there is
stable water flow comes out from shower head.
The electric water heater may be damaged if the water hardness is too high. To
guarantee the normal service life, please install and put it into use on condition that the
local water hardness is less than 450mg/L (CaCO3).
If the water flow is small and power is high while using the unit, outlet water temperature is rather
high; the unit will stop heating automatically. At this time, please lower the power and adjust the
water flow faster in order to avoid inconsistency of water temperature.
Use After Overheating Protection
When the unit is working under normal condition, press “PUMP”, The pump will start immediately and
while press again, the pump stops.
To Activate Pump Function (For MWH-38EU3-**)
When the water heater is working normally (including working state of PUMP),
press “TEST” button, if the leakage test circuit is no problem,
the display will
closed, and the unit will not heat. Press “RESET”, testing
will be canceled, and
the display will be on, the unit will be back to working state set before. If the
circuit leaks, press “RESET” button can’t cancel leakage testing,
“the screen
does not light up, it means the water heater has problems and can’t be used; all the
buttons are invalid, heating
stopped, and pump will be closed. If “Safety sign ”
twinkling flicker,
is it means the heater cannot be connected to the Ground firmly.
Please check the
Grounding before usage.

12
5. MAINTENANCE
WARNING
Do cut off power supply before maintenance, to avoid danger like electric shock.
!
6. TROUBLESHOOTING
This electric water heater should be installed at the place without sunshine or rain spray.
Please cut off power supply if not use for long time.
Please blow down the water for about 10 seconds to drain away the impurities in the pipe before
connecting the water source tothe electric water heater to avoid blockage of water heater.
If long time no use the unit, check the water heater first before use. Electrify after the water
flows out stably.
Do not spray water to air switch or heater body directly, to avoid moist.
Please cut off the power in the weather of thunder and rain to avoid damaging the water heater.
If not use for long period of time, please cut off water inlet to prolong the lifespan of the water
heater.
Check the power cord connecting terminals frequently to make sure that they are well and
reliably contacted, no overheating phenomenon, and grounding is good or not.
Disassembly shower head and sealing ring with filter to clean periodically.
DECLARATION: this water heater can only be maintained by authorized service personnel,
incorrect installation and using method may cause serious injury or loss of property.
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SUGGESTIONS
1. Check whether power
is cut
2. Contact authorized
service personnel for
repair.
1. Rotate “TEMP” knob
2. Repair or replacement
the PCB
1. Press the reset handle
of the thermal cut out
after checking and
troubleshooting
2. Change the heating
elements
3. Adjustable water flow
4. Change the flow sensor
5. Open the flow switch
and clean the rotor
1. Wait for restoration of
running water supply;
2. Open the inlet valve of
running water.
Adjust the heating power
lower, make the water
bigger.
1.Check the grounding
2. Contact authorized
service personnel for repair
.
Contact authorized service
personnel for repair.
REASONS
1. Power supply error;
2. PCB error;
3. Electricity leaks.
1. The “TEMP” knob is off;
2.
3. The water flow
insufficient 1.2L/min;
PCB error;
4. Impurities clogging the
rotor of the flow switch.
1. The running water
supply is cut off;
2. The inlet valve of running
water is not open.
1. Water pressure is not
stable.
2. Outlet water temperature
is too high, overheating
pr
otection again and
again.
1.Ground damage
2. PCB error;
PUMP error.
Temperture sensor
is broken
Change the temperture
sensor
SYMPTOMS
The heating indicator light
is off and the outlet
water is cold.
The outlet water is cold.
Switch on the power
supply,
Screen display
“E5” and flashing
No water flows out from
the shower head.
Outlet water temperature
sometimes is hot,
sometimes is cold.
Pressure can’t be
increased.
1. The thermal cut out
is cut off (Screen
display “E3”)
2. Heating elements
is broken
Screen display E1
Safety sign twinkling
flicker

Alat Pemanas Air Segera Elektrik
Diagram di atas hanya untuk rujukan. Sila jadikan penampilan produk
yang sebenar sebagai standard.
Panduan Pengguna
Terima kasih kerana telah membeli alat pemanas air kami. Sila baca buku panduan ini
dengan teliti sebelum memasang dan mengendalikan alat pemanas air anda, dan disimpan
untuk rujukan kelak.
Pengguna harus menguji pemutus litar bocor ke bumi (ELCB) terbina dalam
sekurang-kurangnya sekali setiap bulan.
For Model: MWH-38EU3-GR
MWH-38EU5-GR
MWH-38EU3-RS-GR
MWH-38EU5-RS-GR

Terima kasih kerana memilih alat pemanas air kami. Sila baca buku panduan ini dengan teliti
sebelum penggunaan; mengetahui cara-cara pemasangan dan penggunaan yang betul bagi
memanfaatkan keunggulan prestasinya dengan sepenuhnya. Sila simpan buku panduan ini
untuk rujukan kelak.
1
KANDUNGAN
Tajuk mukasurat
1.Amaran............................................................................................................................(2)
2.Pengenalan Produk.........................................................................................................(3)
3.Pemasangan Unit............................................................................................................(7)
4.Cara-cara Penggunaan .................................................................................................(10)
5.Penyelenggaraan........................................................................................................... (11)
6.Penyelesaian Masalah......................................................................................................(12)

2
Amaran Khas
1. AMARAN
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Arahan-arahan berikut wajib dipatuhi bagi mengelakkan kecederaan peribadi, kecederaan
terhadap orang lain dan kerosakan harta benda. Pengendalian yang salah akibat tidak
mematuhi arahan berikut bakal menimbulkan kecederaan atau kerosakan.
Unit ini adalah untuk kegunaan di rumah, dan ia sesuai dipasang di mana-mana tempat yang
memerlukan air panas.
Unit ini tidak menggunakan plag. Ia mesti disambungkan terus pada suis kuasa yang
dilengkapi dengan perlindungan kebocoran. Sila bezakan dawai hidup (merah/perang), dawai
neutral (biru) dan dawai bumi (hijau/kuning) sewaktu pemasangan.
Periksa sama ada kawasan pendawaian di rumah adalah bersesuaian sebelum pemasangan,
dan pastikan litar rekaan khas digunakan ketika pemasangan.
Sebelum memasang unit ini, periksa dan pastikan elektrod bumi pada soket dibumikan dengan
sempurna dan tidak mengandungi sebarang arus elektrik.
Air panas yang mengalir keluar dari unit ini mungkin mengakibatkan kelecuran, sila periksa
suhu air panas sebelum penggunaan.
Jarak antara tempat pemasangan unit ini dengan output air hendaklah seberapa dekat yang
mungkin bagi mengelakkan kehilangan haba.
Unit ini mungkin akan rosak jika kekerasan air adalah terlalu tinggi. Untuk jangka hayat produk
yang lebih panjang, sila pastikan unit ini dipasang dan digunakan di tempat dengan tahap
kekerasan air tempatan kurang daripada 450mg/L (CaCO3).
Ketika berkilat/berguruh, matikan Pemutus Litar Kenit (MCB) bagi melindungi unit ini daripada
kerosakan yang mungkin timbul.
Periksa ELCB (pemutus litar bocor ke bumi) terbina dalam sekali setiap bulan bagi
mengelakkan kebahayaan terhadap pengguna, seperti kerosakan harta benda, kecederaan
serius atau kematian.
Putuskan bekalan elektrik sebelum melakukan sebarang kerja penyelenggaraan. Sebarang
kerja penyelenggaraan atau penyelarasan terhadap unit ini oleh orang yang bukan pakar
adalah dilarang sama sekali.
Kord kuasa yang rosak mesti diganti dengan kord kuasa yang disediakan khas oleh pengilang,
dan kerja penggantian mesti dilakukan oleh juruteknik berkelayakan atau jurutera atau pakar
dalam produk yang seumpamanya.
Bagi mengelakkan kebahayaan akibat Pemutus Litar Bocor ke Bumi (ELCB) diset semula
secara tidak sengaja, unit ini tidak boleh dibekalkan melalui peranti pertukaran luaran, seperti
pemasa atau disambungkan pada litar yang kerap “dihidupkan” atau “dimatikan” mengikut
kegunaan.
Unit ini dilengkapi dengan injap keselamatan bagi mengawal kapasiti aliran air. Demi
keselamatan penggunaan, jangan sesekali mengubahsuai kedudukan injap atau menutup
outlet airnya.
Pihak Syarikat tidak akan menanggung sebarang tanggungjawab ke atas pemasangan atau
pengendalian yang tidak betul.
Unit ini boleh digunakan untuk kegunaan lain seperti membasuh tangan, pinggan mangkuk
atau makanan, dan sebagainya (tidak disediakan bekalan air pelbagai arah).
Apabila unit ini digunakan oleh individu seperti kanak-kanak, warga tua, pesakit atau orang
kurang upaya, penjaga mereka hendaklah memberi perhatian dan memeriksa suhu air mandi
dengan tangan dari masa ke semasa.
Kanak-kanak harus diawasi bagi memastikan mereka tidak bermain dengan perkakas ini.

1.5 Liters/minute
IP25
3800W
0~16A
2.5mm²
≥20A
240V~
50Hz
0 MPa
0.03 MPa
0.3 MPa
I
232×406×103 mm
1
AMARAN
!
Alat Pemanas Air ini mesti dibumikan sebelum penggunaan. Sila pastikan rintangan dawai
bumi kegunaan rumahtangga adalah <4Ω. Penggunaan alat pemanas air tanpa
pembumian adalah dilarang sama sekali.
3
2. PENGENALAN PRODUK
2.1 Parameter Prestasi Teknikal
Model
Voltan Kadaran
Frekuensi Kadaran
Kuasa Kadaran
Arus Kadaran
Diameter Teras Dawai
Suis Udara
Tekanan Kadaran
Kadar Aliran Minimum
Tekanan Minimum
Tekanan Maksimum
Kelas Perlindungan
Kelas Kalis Air
Saiz Produk
Kuantiti Tombol
MWH-38EU3-GR MWH-38EU3-RS-GR
MWH-3EU5-GR MWH-3EU5-RS-GR

4
2.2 Identifikasi Bahagian
Kawalan Silikon
Pam DC
Inlet air
Pemutus
termal
Blok terminal
Blok terminal
Papan kawalan utama
Papan kawalan
utama
Tangki
Tangki
Outlet air
Inlet air
Outlet air
Papan paparan
Kawalan Silikon
Pemutus
termal
Panel paparan
Struktur Produk untuk
MWH-38EU3-GR MWH-38EU3-RS-GR
Struktur Produk untuk
MWH-38EU5-GR MWH-38EU5-RS-GR
Sensor suhu
Sensor suhu

2.3 Diagram Pendawaian Dalaman
5
Diagram Pendawaian Untuk
MWH-38EU3-GR MWH-38EU3-RS-GR
Diagram Pendawaian Untuk
MWH-38EU5-GR MWH-38EU5-RS-GR
3
7
5
1
2
N
PE L
G
T1
T2
8
4
6
NL
T1 G
N
CN1
CN8
CN5
CN6
T1
CN2
CN4
RL1RL2
CN2
7
CN2
⑧
⑦
⑥
⑤
④
③
②
①
⑦
⑥
⑤
④
③
②
①
3
5
1
2
N
PE L
G
T1
T2
4
6
NL
T1 G
N
CN1
CN8
CN5
CN6
T1
CN4
RL1RL2
7
Pemutus termal
Blok terminal
Elemen pemanasan
Suis aliran air
Kawalan silikon
Papan Kawalan Utama
Papan paparan
Pam DC
Pemutus termal
Blok terminal
Elemen pemanasan
Suis aliran air
Kawalan silikon
Papan Kawalan Utama
Papan paparan