Midea MWH Series Instant Electric Water Heater Instruction Manual

Midea MWH Series Instant Electric Water Heater

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. 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 performance. Please preserve the instruction manual for future reference.

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 to the local authority regulations.

Special Cautions

• This water heater is for households, and it can be installed wherever place needs hot water. The plug is not used for this water heater; this water heater must be connected directly with a power switch that comes with leakage protection. Please distinguish the live line (red/brown), neutral line (blue) and earth line (green/yellow) during installation.
• Do check whether the amperes of the household wiring are enough before installation and a 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 the 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 a longer product lifespan, please install and put it into use on condition that the local
• water hardness is less than 450mg/L (CaCO3)
• In times 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 the power supply before any maintenance. Any maintenance or adjustment towards this product by non-professionals is highly prohibited.
• The 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.
• 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 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.
• 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 another 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 a child, old person, sick person, and physically handicapped person, the concerned person is kindly requested to pay attention and check the shower temperature by using hand from time to time.
• The heater must be permanently connected to the electricity supply, direct from the consumer unit via a double pole-linked
•  Using a water heater without being earthed is highly prohibited. switch with a minimum contact gap of 3mm in both poles. The switch must be readily accessible and clearly identifiable and out of reach of a person using a fixed bath or shower. The wiring must be connected to the switch without the use of a plug or socket outlet.

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

PRODUCT INTRODUCTION

Technical Performance Parameters

**Parts Identification

**

PRODUCT STRUCTURE FOR MWH-38P3 & MWH-38P3-RS

PRODUCT STRUCTURE FOR MWH-38P5

Internal Wire Diagram

UNIT INSTALLATION

1. Check the capacity of the power circuit;
2. Power cord installation;
3. Water heater installation;
4. Plumbing connection;
5. Power supply connection;
6. Water Supply.

Power Cord Installation

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

Water Heater Installation

• Determine the installation position of the unit according to the length of the power cord/position of air switch (Distance between bottom and floor should be ≥1.6m).
• Make sure the distance between the unit and the surrounding wall is not less than 300mm so that to have enough space for maintenance purposes.
• Determine the position of four fixing screws (attached with the unit), make four holes with corresponding depths 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 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 top cover with the screws.

Plumbing Connection

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

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

A water flow adjusting valve with a filter must be used when install the unit. The blue marker stands for water inlet, red marker stands for water outlet. Do not overexert to avoid damaging the water heater.

1. Adjust power selection knob to“OFF”;
2. Choose air switch with leakage protection according to the power of the water heater;
3. When connecting the water heater to electric network, please pay attention to connecting live line (red/brown), neutral line (blue) and earth line (yellow/green) with the corresponding line 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.

Water Supply
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.

METHODS OF USING

Operating Of The Unit
Switch on the power supply, the unit will take self-inspection for 2s, “ELCB” green indicator light will be 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 rotate switch, heating indicator light will be on, the unit starts to work.

Leakage Testing
When the water heater is working normally (including the working state of PUMP), Press the “TEST” button, if the leakage test circuit is no problem, “ELCB” green the indicator light will be off, and the unit will not heat. Press “RESET”, and testing will be canceled, and the “ELCB” green indicator light will be on, the unit will be back to the working state set before. If the circuit leaks, press the “RESET” button can’t cancel leakage testing, “EARTH”、“ELCB” and “POWER” indicator light is twinkling flicker, it means the water heater has problems and can’t be used; all the buttons are invalid, heating is stopped, and the pump will be closed.

To Adjust Water Flow
Rotate the handle of the 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 a certain value between 7.5mA and 15mA, the “EARTH”、“ELCB” and “POWER” indicator light will be twinkling flicker, 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.

To Activate Pump Function (For MWH-38P3 & MWH-38P3-RS)
When the unit is working under normal conditions, press “PUMP”, The pump will start immediately and has been working until the water flow is insufficient 1.2L/min for more than 3 seconds.

To Adjust Water Pressure (For MWH-38P3 & MWH-38P3-RS)
The water pressure is increased when Pump is started; Rotate Pump knob to adjust water pressure, rotate clockwise, water pressure is increased and vice versa.

Use After Overheating Protection
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.

For first time using, ensure electrify after the unit is filled fully with water and there is stable water flow coming out 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 put it into use on condition that the local water hardness is less than 450mg/L (CaCO3).

MAINTENANCE

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 to the 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 the grounding is good or not. Disassemble the 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.

TROUBLESHOOTING

References

• Midea - Make yourself at Home - World's Number 1 Appliance Producer
• Midea - Make yourself at Home - World's Number 1 Appliance Producer

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