Midea DFS55HK User manual

DFS55HK
USER MANUAL
Warning: All the contents of this Guide have been checked carefully. If there are any printing errors OR
misunderstanding, please contact Midea customer service team.
It will be compiled into the new version of the guide without any notice if there are any technical improvements.
The diagram above is just for reference. Please treat the appearance of the actual product as final.
Instant Electric Water Heater

01
Thank you for choosing Midea! Please read this user manual be carefully before
using this new appliance to ensure that you have a better understanding of the
product features, and know how to operate this product in a safe way.
CONTENTS
0
02
1
10
08
13
14
15
16
04
05
07
17
INDEX
SAFETY INSTRUCTIONS
SPECIFICATIONS
PRODUCT OVERVIEW
QUICK START GUIDE
PRODUCT INSTALLATION
OPERATION INSTRUCTIONS
CLEANING AND MAINTENANCE
TROUBLESHOOTING
TRADEMARKS, COPYRIGHTS AND LEGAL STATEMENT
DISPOSAL AND RECYCLING
DATA PROTECTION NOTICE

The following safety guidelines are intended to prevent unforeseen risks or damage from
unsafe or incorrect operation of the appliance. Please check the packaging and appliance
upon arrival to make sure everything is intact and ensure a safe operation. If you find any
damage within 7days after purchase, please contact the retailer or dealer. Please note
that modifications or alterations to the appliance are not allowed due to the safety
concern. Unintended use may cause hazards and loss of warranty claims. Please refer to
the terms & conditions at the warranty card or Midea HK ocial website.
Intended Use
SAFETY INSTRUCTIONS
02
Warning
Caution
This signal indicates a hazard with a low level of risk which, if not
avoided, may result in minor or moderate injury.
Read these operating instructions carefully and attentively before using/commissioning the
unit and keep them in the immediate vicinity of the installation site or unit for later use!
Explanation of Symbols
Warning
This signal indicates a hazard with a medium level of risk which, if not
avoided, may result in death or serious injury.
Note
This signal indicates important information (e.g. damage to property),
but no danger involved.
Caution
Explanation of Symbols
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.
Special Cautions
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.
Please check whether the amperes of the household wiring is enough before
installation. Dedicated circuit must be used for such installation.
Before installing this water heater, check and confirm that the earth electrode on the
socket is reliably earthed without electricity pass through.
The hot water from the water heater may cause scald, please test the temperature of
the hot water before use.
The distance between where the water heater installed and the water output should
be as nearby as possible in order to avoid heat loss.
CAUTION
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03
The electric water heater may be damaged if the water hardness is too high. To ensure
longer product lifespan, please install and use under the condition that local water
hardness is less than 450mg/L (CaCO3)
In time of lightning/thunder, switch “O” the Miniature Circuit Breaker (MCB) in
advance to protect the water heater against possible damage.
Cut-o power supply before any maintenance. Any maintenance or alteration towards
this product by non-professional is highly prohibited.
If the power cord is damaged, please stop use the appliance immediately and contact
Midea customer service center for product maintenance.
In order to avoid a hazard due to inadvertent resetting of the Earth Leakage Circuit
Breaker (ELCB), this appliance must not be able to have electricity supplied through
an external switching device, such as timer or connected to a circuit that is regularly
switched “On” and “O” by the utility.
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 dierent purpose, eg. Washing hands, dishes or
foods, and so on. (Multi directional water supply is not available).
We declare that DSF55HK unit be connected only to a supply with the relevant system
impedance no more than 0.161 ohm. Restrictions to connection may be imposed by
the supply authority on the use of equipment in the actual relevant system impedance
at the interface point on the user’s premise exceeds 0.161 ohm.
CAUTION
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Warning
The water heater should be earthed before use. Please ensure that the resistance of
household earth wire is ＜4 . Installing device without earthed is highly prohibited.
The means for disconnection from the supply mains having a contact separation in all
poles that provide full disconnection under overvoltage category III conditions must
be incorporated in the fixed wiring in accordance with the wiring rules.
The way of fixation described do not involve the use of adhesives as they are not
considered as one of the reliable fixation methods.
The water inlet of this appliance shall not be connected to inlet water obtained from
any other water heating system.
This device is not intended for the use of drinking water supply.
This appliance can be used by children aged 3 and above and persons with reduced
physical, sensory or mental capabilities or lack of experience and knowledge if they
have been given supervision or instruction concerning the use of the appliance in a
safe way and understand the hazards involved.
Cut o power supply before maintenance, to avoid danger like electric shock.Children
shall not play with the appliance. Cleaning and maintenance shall not be made by
children without supervision.
The water inlet pressure shall not exceed the value marked on the rating label. If it
does, a pressure reducing valve must be installed.

04
SPECIFICATIONS
Product Model DFS55HK
5700W
24.7A
15mA
0.8MPa
1.5Liters/minute
0.8Liters/minute
I
IPX4
220×185×70 mm
≥25A
Rated Voltage
Rated Current
Rated Power
Rated Frequency
Wire Specification
Air Switch Specification
Leakage protection action current
Starting Water Flow
Ending Water Flow
Protection Class
Water Proof Class
Products Size
1.7kgNet Weight
Maximum Water Pressure
50Hz
220-240V~
2.5mm

05
Product introduction
PRODUCT OVERVIEW
Front shell
Display
Operation panel
Water flow sensor
Water inlet pipe
Water inlet blue
marking sleeve
Water inlet
temperature sensor
Flow regulating valve
Main control board
Outlet water
temperature sensor
Outlet pipe red
marking sleeve
Outlet pipe
Posterior shell
Heating tube
Power cord

06
Pruduct structure
BC
A
D
DFS55HK
A
B
C
D
220
185
70
142
(Note:All dimensions are in mm)
Internal Wire Diagram
Thermostat / Thyristor board/ Thyristor /
Power supply board/ ⑥Display panel /
INSTALLATION OF ELECTRICAL SCHEMATICS
Heater /
⑦Flow sensor /
⑧Temperature sensor

07
Accessories
1. Connecting the power cord 2. Turn on the tap
3. Start up 4. Temperature adjustment
5. If necessary, the water flow can be
adjusted, for example, when the
temperature cannot reach the preset
setting
Earthing
220-240V~
MAX
MIN
QUICK START GUIDE
Before First Use
Plastic expansion tube Mounting screws
1.
2.
The water heater is correctly installed as required
For the first time, water shall be supplied before power supply
Note

08
Installation Instruction
Check the capacity of power circuit
Water Heater Installation
PRODUCT INSTALLATION
1. Check the capacity of power circuit;
2. Water heater installation;
3. Plumbing connection;
4. Power cord installation;
5. Water Supply.
To install DFS55HK, the copper wire core of the wire must be greater than 2.5mm.
The air switch with leakage protection should be greater than 25A.
The meter specification is greater than 40A.
The ground wire must be reliably grounded.
1.
2.
3.
The water heater should be installed in an unobstructed position under the basin to
facilitate user operation.
The distance between the water heater and the surrounding walls should be more
than 20cm, which is convenient for future maintenance.
According to the installation hole position of the rear shell of the machine, draw lines
on the wall to mark the position, then drill holes on the solid wall with an electric drill.
Put a plastic expansion pipe into the hole and fix the water heater to the wall with
screws.
The distance between the hot water outlet of the water heater and the hot water use
point should be as short as possible to reduce heat loss and for water saving.
The installation position of air switch must be higher than the valve and the product
inlet / outlet pipe.
1.
2.
3.
4.
5.
6.
Wall
Two expansion screws
79mm
Two self tapping screws

09
Plumbing Connection
Put a gasket on the water inlet joint of the water heater.
Put a gasket on the water outlet connector of the water heater and connect the hose
assembly of the faucet as shown in the figure.
1.
2.
Wash basin
Tee joint
Hose
Cold water inlet valve
Hose
Water tap
Air switch
Power cord
Electric water heater
Intake Outlet
Blue marker stands for water inlet, red marker stands for water outlet. Do not overexert
to avoid damaging the water heater.
Note

10
Power Cord Installation
1.
2.
Cut o the power supply.
Connect the power line to the air switch with leakage protection, and pay attention to
the screw that it must be tighten but not loosened. otherwise it will cause fire (red or
brown is the live line L, blue is the zero line N, and yellow or green is the ground line
E.)
1.
2.
To make the water heater work automatically, the water pressure at inlet should be
no less than 0.03MPa and water flux should be no less than 1.5L/min.
The water heater begins to work after the outlet valve and the power switch being
switched on, Whereas, the water heater stop working after the valve and the power
switch being switched o. We can change the water temperature at outlet by
adjusting the valve.
Water Supply
After all the plumbing connection is completed, 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 watertap. Check whether there is leakage at joints. If so, check whether
the connecting parts are fastened, then re-supply water.
Methods of using
OPERATION INSTRUCTIONS
Operation interface
Temperature Icon
Power Icon
Set temperature
Adjustment key
On / off key
Error Icon
Grounding Icon

11
1. On / o:
After the power is turned on, press the on / o key to start and shut down the
machine.
2.
3.
Set temperature
When the machine is turned on, press the adjustment key to adjust the temperature，
With each click, set the temperature to increase or decrease by 1 ℃, and set the
temperature adjustment range: 30-48 ℃; If there is no operation for 5 seconds, the
setting result is automatically confirmed, and the system enters the working state.
Power selection
In the power on state, press the plus / minus temperature adjustment key at the same
time to enter the limited maximum power selection mode.
Operation instructions
The factory default adjustment is at the maximum position
Note
4.
5.
Power function setting description
Long press the plus or minus temperature adjustment key to enter the power selection
state. The kW icon is lit up, showing that power and flashing. In this state, press the up
and down temperature adjustment keys to switch the power. The maximum power is
adjusted between 3.6kW, 4.4kW and 5.7kW. 5S passed without operation, the power
selection is confirmed, the kW Icon is o, the setting is successful, and the power
selection mode is exited.
Flow settting
Adjust the flow regulating valve on the left side of the machine to regulate the inlet
water flow, so as to limit the flow and make the outlet water temperature can meet the
set temperature requirements. Operation method: Insert a slotted screwdriver into the
hole of the regulating valve on the left side of the machine and rotate in an anti-clock-
wise direction. The larger the rotation angle is, the smaller the flow is.(the maximum
rotation angle is 90 °.)
MAX
MIN

12
6. Grounding indication
When the icon is on, it means that the machine has no potential safety hazards and can
be used safely;
When the icon flashes once a second, it indicates that the ground wire is not connect-
ed or in a poor connection.
7. Error indication
When the error icon is on, it means that the machine has no fault and can be used
normally.When the icon flashes once a second, it means that the machine has an error,
and the machine will not be able to use, so it is necessary to be repaired.
1. Swtich on and o the heating function: In standby mode, the "safety sign" is on, which
can turn on and o the heating and adjust the water temperature. If the heating is not
started within 5 minutes, the display screen will only display the "safety sign" and the
"grounding sign".
(1)
(2)
Start the heating function: using the flow sensor to detect only. When the detected
flow is greater than 1.5L/min, the water heater starts to work and enters the
heating state. At this time, the "°C" icon is on
Turn o the heating function: using the flow sensor to detect only. When the
detected water flow is less than 0.8L/min, the water heater will stop heating and
the icon of "°C" will be gone. The water heater will be in standby state. If the
heating is not restarted after 5 minutes, the display screen is o and only 'safety
sign' and 'grounding sign' are left.
2. Grounding prompt function：In standby mode, prompt whether the water heater is
connected to the ground
3. Temperature adjustment function：The default initial setting temperature of the water
heater is 38 °C, which can be adjusted by pressing the key to set the target tempera-
ture of the outlet water. The allowable temperature adjustment range is 30 °C - 48 °C.
(1)
(2)
Normal connection: when the water heater is connected with the ground wire, the
"grounding identification" icon is on
Not normally connected: when the ground wire of the water heater and the home
ground wire are not normally connected, the "grounding identification" icon
flashes every second
Other functions
Under the full power heating, when the dierence between the outlet water temperature
and the set temperature is more than 2 °C, the "°C" icon and the set temperature flash
once a second to remind the user to reduce the flow.
Note

13
CLEANING AND MAINTENANCE
This water heater can only be maintained by authorized technicians. Incorrect installa-
tion and using method may cause serious injury or loss of property.
This electric water heater should be installed at a place without sunshine or rain spray.
Please cut o power supply it is not used for a long time.
If the device hasn't been used for a long time, please double-check the water heater
before using again. Make sure no filth in water inlet hose, water outlet hose and
sprayer. Electrify only after the water flow become stable.
Do not spray water to switch or heater body directly, to avoid humidity.
Please cut o the power under thunder and rain to avoid damaging the water heater.
Check the power cord connection terminals frequently to make sure that they are in
good condition and reliably connected, no overheating, and grounding is good.
It is suggested to clean the water heater and sprayer frequently. After closing the
valve and switching o the power, wipe o all the dirt with a clean cloth. If necessary,
the outer shell can be washed as well. However, you must dry up the housing after
cleaning. If the water flow is not smooth, please loosen the screws to clean up the
sprayer and the filter in the water heater.
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DECLARATION:
4.
5.
Constant temperature function：The water heater tracks the inlet temperature and
inlet flow, and automatically calculates the output power to ensure that the outlet
temperature is stable within the range near the set temperature
Error protection function：In the standby state, check the quality of hardware such as
inlet and outlet temperature sensors
(1)
(2)
(3)
Function of detecting the outlet water temperature sensor: when the outlet water
temperature sensor is detected to be open circuited or short circuited, the "set
temperature" icon on the display screen will flash (once a second) to display E1,
which cannot be heated and maintenance is needed.
Function of detecting the water inlet temperature sensor: when the water inlet
temperature sensor is detected to be short circuited or open circuited, the "set
temperature" icon on the display screen will flash (once a second) to display E2,
which cannot be heated and maintenance is needed.
Overtemperature protection function: when the outlet water temperature exceeds
85 ℃, disconnect the relay and stop working. The display screen displays E3
(flashing once a second). After the error is fix, it can be recovered after power o

14
TROUBLESHOOTING
REASONS SUGGESTIONSSYMPTOMS
Low temperature
or low water
output
The security icon
flashes
Check whether there is
power failure
Inform professionals to repair
Replace the outlet water
temperature sensor
Set the temperature higher
Press the start button to start
the machine
Replace the water inlet
temperature sensor
Waiting for normal water
supply
Power failure
Power board failure
Water outlet temperature
sensor short circuit or open
circuit fault
If the outlet water
temperature exceeds 85 ℃, it
is defined as dry burning
error
Poor contact of ground wire
Main control board fault
Inlet water flow is less than
starting flow (1.5l/min)
Plug in the power
supply but there is
no display on the
screen
Display E1
Display E2
Display E3
No hot water from
hot water outlet
Water heater does
not start heating
The current set temperature
is low
Not powered on
The outlet water
temperature is unstable,
sometimes cold and
sometimes hot
Increase inflow flow
Backwash from the water
outlet for several minutes
before use;Inform the
professional maintenance
personnel to clean the
impurities in the flow sensor
Notify professional mainte-
nance personnel to repair
Stop using it immediately
and inform the professional
maintenance personnel
Water cut o
Electric water heater is not
reliably grounded
Use when the water
pressure rises
Open the water inlet valve
Water pressure too low
Inform professionals to
repair
Water inlet temperature
sensor short circuit or open
circuit fault
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Action of high temperature
protection
Inform professionals to
repair
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Inlet valve not opened
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The water pressure is unstable,
and the water flow is varying
Use after the water flow is
stable
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●Blocked flow sensor

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from using any part of an Midea trademark. Use of Midea trademark for commercial
purposes without the prior written consent of Midea may constitute trademark
infringement or unfair competition in violation of relevant laws.
This manual is created by Midea and Midea reserves all copyrights thereof. No entity or
individual may use, duplicate, modify, distribute in whole or in part this manual, or
bundle or sell with other products without the prior written consent of Midea.
All the described functions and instructions were up to date at the time of printing this
manual. However, the actual product may vary due to improved functions and designs.
TRADEMARKS, COPYRIGHTS
AND LEGAL STATEMENT
15

DISPOSAL AND RECYCLING
Important instructions for environment
Compliance with the WEEE Directive and Disposing of the Waster Product:
This product complies with EU WEEE Directive (2012/19/EU). This product bears a
classification symbol for waster electrical and electronic equipment (WEEE).
This symbol indicates that this product shall not be disposed
with other household wastes at the end of its service life. Used
device must be returned to ocial collection point for
recycling of electrical electronic devices. To find these
collection systems please contact to your local authorities or
retailer where the product was purchased. Each household
performs important role in recovering and recycling of old
appliance. Appropriate disposal of used appliance helps
prevent potential negative consequences for the environment
and human health.
Compliance with RoHS Directive
The product you have purchased complies with EU RoHS Directive (2011/65/EU). It does
not contain harmful and prohibited materials specified in the Directive.
Package information
Packaging materials of the product are manufactured from
recyclable materials in accordance with our National Environ-
ment Regulations. Do not dispose of the packaging materials
together with the domestic or other wastes. Take them to the
packaging material collection points designated by the local
authorities.
16

DATA PROTECTION NOTICE
For the provision of the services agreed with the customer,
we agree to comply without restriction with all stipulations of applicable data protection
law, in line with agreed countries within which services to the customer will be delivered.
Generally, our data processing is to fulfil our obligation under contract with you and for
product safety reasons, to safeguard your rights in connection with warranty and
product registration questions. In some cases, but only if appropriate data protection is
ensured, personal data might be transferred to recipients located outside of the Europe-
an Economic Area.
Further information are provided on request. You can contact our Data Protection
Ocer via [email protected]. To exercise your rights such as right to object your
personal date being processed for direct marketing purposes, please contact us via
[email protected]. To find further information, please follow the QR Code.
17

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