Instant Electric Water Heater

1. Cautions

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. Installation must be carried out by qualified personnel and in compliance with local authority regulations.

Special Cautions

• This water heater is for household use and can be installed wherever hot water is needed, e.g., for washing hands, dishes, or food. (Multi-directional water supply is not available).
• A plug is not used for this water heater; the appliance must be connected directly to a power switch that includes leakage protection. Please distinguish the live line (red/brown), neutral line (blue), and earth line (green/yellow) during installation.
• Do check whether the household wiring amperage is sufficient before installation, and a dedicated circuit must be used.
• Before installing this water heater, check and confirm the earth electrode on the socket is reliably earthed and without electricity.
• The water heater should be installed indoors where the temperature stays above 0°C. If the water inside the water heater has frozen, it is forbidden to turn on the water heater before the ice melts.
• Hot water from the appliance may cause scalds; please test the temperature of the hot water before use.
• The distance between the installed water heater and the water output should be as near as possible to avoid heat loss.
• The electric water heater may be damaged if the water hardness is too high. To ensure a longer product lifespan, please install and use it only if the local water hardness is less than 450mg/L (CaCO3).
• In case of lightning/thunder, switch "Off" the Miniature Circuit Breaker (MCB) in advance to protect the water heater against possible damage.
• Inspect the built-in ELCB (Earth Leakage Circuit Breaker) once a month to avoid hazards such as property damage, serious injury, or death.
• Do cut off power supply before any maintenance. Any maintenance or adjustment to this product by non-professionals is highly prohibited.
• A damaged 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 similar products.
• 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 a timer, or connected to a circuit that is regularly switched "On" and "Off" by the utility.
• The water heater is equipped with an adjustable flow capacity safety valve. For safety use, please do not change its installation location and do not block its water outlet.
• The heater must be permanently connected to the electricity supply, direct from the consumer unit via a double-pole linked switch with a minimum contact gap of 3mm in both poles. The switch must be readily accessible, clearly identifiable, and out of reach of persons using a fixed bath or shower. The wiring must be connected to the switch without the use of a plug or socket outlet.
• The appliance is not to be used by children or persons with reduced physical, sensory, or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction. Children should be supervised not to play with the appliance.
• The shower head must be descaled regularly. When the shower is used by someone such as a child, elderly person, sick person, or physically handicapped person, the responsible person is kindly requested to pay attention and check the shower temperature by using their hand from time to time.
• For any improper installation and incorrect operation of this product, Midea will not be liable for any responsibility.

⚠️ WARNING

The water heater should be earthed before use. Please ensure that the resistance of the household earth wire is <4Ω. Using the water heater without earthing is highly prohibited.

2. Product Introduction

2.1 Technical Performance Parameters

2.2 Parts Identification

The product structure diagram for the DSK**P5 model displays the external and internal components. Key parts include the water inlet, water outlet, heating elements assembly, thermal cut-out, temperature sensor, flow sensor, main control board, indicator light board, and control knobs.

2.3 Internal Wire Diagram

The wiring diagram for the DSK**P5 model shows the electrical connections. It details the main control board's link to the temperature sensor, flow sensor, indicator light and key board, terminal block, ELCB (Earth Leakage Circuit Breaker), relay, silicon control, and heating elements. The terminal block facilitates connection to the power supply (Live, Neutral, Earth).

3. Unit Installation

3.1 Installation Instruction

• Check the capacity of the power circuit.
• Power cord installation.
• Water heater installation.
• Plumbing connection.
• Power supply connection.
• Water supply.

3.2 Power Cord Installation

1. Remove the screws at the bottom of the unit. Lift up the Main Switch Knob and Power Knob to make them free. Remove the front plate gently.
2. Remove the power cord wire pressing plate and keep the screws.
3. Gash the middle of the film of the power cord jacket with a sharp knife to insert the power lines.
4. Screw the power cord into the jacket for installation of the wire pressing plate.
5. Tighten the wire-pressing plate with screws to the primary position, ensuring that the power cord is not pulled out more than 60N.
6. Connect the power cord to the wiring terminals as shown in the diagram.

NOTE: The installation position of the neutral line (blue), live line (brown/red), and earth line (green/yellow) should correspond to the other end on the wiring terminals.

3.3 Water Heater Installation

• Determine the installation position of the unit according to the length of the power cord and the position of the air switch (Distance between the bottom and the floor should be 1.6m).
• Make sure the distance between the unit and the surrounding wall is not less than 300mm to allow enough space for maintenance purposes.
• Determine the position of four fixing screws (attached with the unit), make four holes with corresponding depth in the wall using a drill, and drive a wall plug into each hole.
• Drive in the screws on the top and ensure a certain distance between the screw head and the wall (See Fig. 1).
• Mount the unit on the wall and tighten with two screws at the bottom, connect the wires, and install the top cover with screws.

Figure 1 illustrates recommended installation clearances. The unit requires a minimum 300mm space from surrounding walls for maintenance. The recommended height from the floor to the bottom of the unit is approximately 1.6m. The unit is mounted using screws at the top and secured with screws at the bottom.

3.4 Plumbing Connection

• A water valve with a filter should be installed at the water inlet of the unit; a sealing ring with a filter should be used at the end face (See Fig. 2).
• The shower flexible tube should be connected with the water outlets and shower head separately, with a sealing ring used at the end face.

⚠️ WARNING

Metallic / chromed hose and conductive control valve shall not be used.

Figure 2 depicts plumbing connections. A water valve equipped with a filter must be installed at the water inlet. The blue marker signifies the water inlet, and the red marker indicates the water outlet. A water flow adjusting valve with a filter is mandatory. The use of metallic/chromed hoses and conductive control valves is prohibited.

3.5 Power Supply Connection

• Adjust the power selection knob to "OFF".
• Choose an air switch with leakage protection according to the water heater's power.
• When connecting the water heater to the electric network, please pay attention to connecting the live line (red/brown), neutral line (blue), and earth line (yellow/green) with the corresponding lines in the electric network.

NOTE: A private power cord should be used for this unit. After connecting to the electric network, please check the earth condition and make sure the earth resistance is <4Ω.

3.6 Water Supply

• After all plumbing is finished, open the water inlet valve of the product and supply water to the unit to drain away air inside until there is a stable water flow coming out from the shower head.
• Check whether there is leakage at the joints. If there is, check whether the connecting parts are fastened, then re-supply water.

4. Methods of Using

4.1 Operating Of The Unit

• Switch on the power supply; the unit will perform a self-inspection for 2 seconds. The "ELCB" green indicator light will turn on (under the condition of no electricity leakage).
• When the water flow exceeds 1.2L/min, rotate the knob clockwise to switch on the heating power. The heating indicator light will turn on, and the unit will start to work.

4.2 Leakage Testing

• When the water heater is working normally, press the "TEST" button. If the leakage test circuit is functioning correctly, the "ELCB" green indicator light will turn off, and the unit will stop heating.
• Press "RESET" to cancel the test; the "ELCB" green indicator light will turn on, and the unit will return to its previously set working state.
• If the circuit leaks, pressing the "RESET" button will not cancel the leakage test. The "EARTH", "ELCB", and "POWER" indicator lights will be twinkling/flickering, indicating a problem with the water heater, and it cannot be used. All buttons will be invalid, and heating will stop.

4.3 To Adjust Water Flow

Rotate the handle of the water flow adjusting valve to adjust the water flow.

4.4 Electricity Leakage Protection

When the electricity leakage testing circuit is working normally, if the leakage current exceeds a certain value between 7.5mA and 15mA, the "EARTH", "ELCB", and "POWER" indicator lights will be twinkling/flickering, and heating will stop. The unit can only be used after the fault is excluded. (When electricity leakage is tested, red and green indicator lights are all off, and heating stops.)

4.5 To Adjust Water Temperature

• Rotate the handle of the water flow adjusting valve to adjust to the proper water flow.
• Adjust the power by rotating the knob; clockwise rotation increases power and consequently water temperature, or vice versa.

4.6 Use After Overheating Protection

• If the water flow is small and the power is high during use, the outlet water temperature will be very high. The unit will stop heating automatically.
• At this time, please lower the power and increase the water flow to avoid inconsistency in water temperature.

NOTE: For first-time use, ensure power is supplied only after the unit is fully filled with water and there is a stable water flow from the 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 use it on the condition that the local water hardness is less than 450mg/L (CaCO3).

5. Maintenance

• This electric water heater should be installed in a place without direct sunshine or rain spray. Please cut off power supply if not in use for a long time.
• Please blow down the water for about 10 seconds to drain away impurities in the pipe before connecting the water source to the electric water heater to avoid blockage.
• If the unit has not been used for a long time, check the water heater first before use. Supply power only after water flows out stably.
• Do not spray water directly onto the air switch or heater body to avoid moisture.
• Please cut off the power during thunder and rain weather to avoid damaging the water heater.
• If not in use for a long period, please cut off the water inlet to prolong the lifespan of the water heater.
• Check the power cord connecting terminals frequently to ensure they are well and reliably contacted, show no overheating phenomenon, and are properly grounded.
• Disassemble the shower head and sealing ring with a filter to clean periodically.

DECLARATION: This water heater can only be maintained by authorized service personnel. Incorrect installation and usage methods may cause serious injury or loss of property.

⚠️ WARNING

Do cut off power supply before maintenance to avoid dangers like electric shock.

6. Troubleshooting