WM-P400GX - Water pump HITACHI - Free user manual and instructions

Product Type	Water Pump
Model	WM-P400GX
Brand	Hitachi
Power Rating	400 W
Voltage	220-240 V
Frequency	50/60 Hz
Max Flow Rate	60 L/min
Max Head	30 m
Inlet/Outlet Size	1 inch (25 mm)
Housing Material	Cast Iron
Impeller Material	Stainless Steel
Protection Class	IPX4
Dimensions (L x W x H)	30 x 20 x 25 cm
Weight	5 kg
Operating Mode	Manual / Auto
Thermal Protection	Yes
Maintenance	Clean filter regularly
Spare Parts Available	Yes, through authorized service
Warranty	2 years (check local terms)

Frequently Asked Questions - WM-P400GX HITACHI

How do I install the Hitachi WM-P400GX water pump?

Ensure the pump is placed on a stable, level surface. Connect the inlet pipe to the water source and outlet pipe to the desired delivery point. Use the provided fittings and seal all connections with Teflon tape. Plug into a properly grounded outlet.

What should I do if the pump does not start?

Check the power supply and ensure the plug is firmly connected. Verify that the thermal overload protection has not tripped; if so, allow the pump to cool down and reset. Also check that the float switch (if applicable) is not stuck in the 'off' position.

How do I prime the pump before first use?

Remove the priming plug on the pump casing and fill the chamber with water until it overflows. Replace the plug tightly. This ensures the pump has a water seal and can operate without dry running damage.

What maintenance does the pump require?

Periodically clean the inlet filter to prevent clogging. Check for leaks at connections. Inspect the power cord for damage. For long storage, drain the pump completely and store in a dry place.

Can the pump run dry?

No, running the pump dry can damage the seals and motor. The pump should always be primed and have a continuous water supply. The thermal protection will shut off the motor if overheating occurs, but repeated dry runs can cause permanent damage.

What is the maximum suction lift of the WM-P400GX?

The maximum suction lift is typically 8 meters, but this is dependent on altitude and the specific gravity of the fluid. For optimal performance, keep the suction line as short and straight as possible.

How do I adjust the pressure switch?

The pressure switch is preset from the factory. To adjust, remove the cover and turn the adjustment screw clockwise to increase cut-in pressure and counterclockwise to decrease. Refer to the manual for exact settings. Improper adjustment may cause short cycling.

What type of fluid can the pump handle?

This pump is designed for clean water only. Do not use with flammable, corrosive, or abrasive liquids. For dirty water or sewage, use a dedicated pump.

Why is the pump cycling on and off frequently?

Frequent cycling can be caused by a leak in the system, a faulty pressure switch, or a pressure tank that has lost its air charge. Check for leaks and ensure the tank pressure is set correctly (typically 2-3 psi below cut-in pressure).

Where can I find spare parts?

Spare parts are available through authorized Hitachi service centers. Use your model number WM-P400GX to order. Common consumables include the impeller, seals, and capacitors.

USER MANUAL WM-P400GX HITACHI

HITACHI Inspire the Next

MODEL : WM-P400GX / WM-P750GX

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INVERTER PUMP

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Please read and understand these instructions well before use, and kindly use them correctly.

Do not disassemble, repair or modify the unit unless you are a professional repairman.

The unit must always be earthed and a circuit breaker installed specifically for use with the unit.

Do not use the pump when the pump cover is removed.

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Do not place objects on the pump.

For the first-time-machine operation after it has been installed, please open the hopper cap then pour in the water.

1. While filling water, it must not be overflow and be careful the water touching any electrical element such as motor, electronic parts, etc.

(For Pump lower than 300w, water must be filled approximately 200 cc.)

(For Pump lower than 350w, water must be filled approximately 600 cc.)

* In case of deep pump or over horizontal machine operation, which may affect to the time of pump water.

In the event of a malfunction in the motor that is happened from adjusting mode without carefulness. Please check according to the following instruction.

In the event that water is not used for 3-4 consecutive days or more, there is a possibility that sediment will settle inside the pump. In this case, turn on the water at the stopcock for approximately 5-6 minutes. When the water appears cleaner, it may be used.

The LED usually displays the water discharge pressure, such as when 290 is equal to 240kPa (in order to reduce the STAND-BY power, the LED will turn off after 10 minutes). For details, please refer to 'Display' (p16). If the pump malfunctions, the LED will display the malfunction, and the pump will cease to function accordingly.

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Maintenance is quite difficult in restricted areas; therefore, for ease of maintenance, please leave an appropriate amount of space above, behind or surrounding the pump.