Warning:

• Before installing and using the product, please read the instruction manual carefully and keep it properly.
• Before using the electric pump, it must be reliably grounded, and a leakage protection device should be installed.
• Do not use water containing sediment or metal powder; the medium temperature must be below 95°C.
• During installation, a leakage protector must be installed and properly grounded.
• Strictly prohibit running the pump without water (dry operation).
• Fill with water before first use.

Application Scenario

Suitable for various household water supply applications, such as villas, duplex apartments, and bungalows. It can be used to boost household tap water pressure, draw water from wells, or increase pressure for rooftop water tanks.

Conditions of Use

1. Before first use, fill the pump chamber with water and make sure the pipeline has no leaks.
2. This product has a built-in frequency converter and must not be used as a submersible pump. Do not place it in water to avoid damage.
3. The product will only operate when the water pressure in the pipeline reaches a certain level. The solid impurities in the water must not exceed 0.19% by volume, and the particle size must not exceed 0.2 mm.
4. Manual mode operates continuously without automatic shutdown. It must not run dry and should only be used in emergencies when faults occur; otherwise, machine damage may result. The temperature of the conveyed medium must not exceed 95 °C.
5. Power supply frequency: 50/60 Hz; voltage: single-phase AC 220 V; voltage fluctuation range: 160–280 V.

Installation and Operation Instructions

1. Do not run the pump dry without water or priming.
   The pump body must be filled with water before switching on.
2. The pump must be placed in a horizontal position!
   When connecting the water inlet, pay attention to the water flow direction.
3. After installation, ensure the piping is completely sealed.
   Check adapters and valves for leaks. After stopping water use, close the valve to prevent loss of pressure that could cause the pump to keep running.

YC-F Operating Instructions

YC-B Operating Instructions

Operating Instructions

Power On/Off Button:
Controls the start and stop of the water pump. When a fault occurs, press this button to reset.

Increase Button (+):
In water tower mode, press to increase pressure or operation time.

Decrease Button (−):
In water tower mode, press to decrease pressure or operation time.

Press “+” and Power Button simultaneously:
Switch to Constant Pressure Mode.

Press “−” and Power Button simultaneously:
Switch to Water Tower Mode.

Long Press Power Button (3 seconds):
Enter Emergency Start Mode.

Press “+” and “−” simultaneously:
Enter Function Calibration Interface (see detailed explanation in function interface section).

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Mode Description

Constant Pressure Mode:
This is the default mode. No settings or adjustments are required.
Once powered on, the system operates automatically.
If the water pressure does not meet usage demand, use the Increase (+) or Decrease (−) buttons to adjust the pressure.

Water Tower Mode:
When the water tower needs filling, switch to this mode to enable timed auto start.
The default initial runtime is 0.5 hours (30 minutes).
Press the Increase (+) button to extend the duration in 0.5-hour increments, up to 48 hours.
To reduce the runtime, press the Decrease (−) button.

Emergency Start Mode:
In emergency cases where the system cannot start normally, press and hold the power button to manually control motor speed.
The default target speed is 1000 rpm.
Press the Increase (+) button to raise the speed in 100 rpm increments, or the Decrease (−) button to reduce it.

If overheating, overload, or sensor failure occurs, the system will alarm.
Emergency mode should be used only temporarily and not for long-term operation.

Product Parameters:

Performance Parameters

TECHNICAL DATA

Model	Power (w)	Rated Flow (m³/h)	Rated Head (m)	Max Flow (m³/h)	Max Head (m)	Max Speed (r/min)	Inlet/Outlet (mm)
YC-B-400	400	2.5	22	4.8	40	4200	25
YC-B-700	700	3.5	30	5.8	50	4600	25
YC-B-900	900	4	30	6.5	60	4300	25

Setting Page Description

Setting Code	Setting Description
C1	Pressure calibration setting. Minimum value: 0, maximum value: 2.0, default initial value: 1.0. Used to calibrate the current pressure display value.
C2	Low water pressure threshold setting. Minimum value: 0, maximum value: 1.0, default initial value: 0.5. When the actual water pressure remains below this threshold for an extended period (as set by the “Low Water Delay Time”), a low-water fault is reported.
C3	Low water delay time setting. Minimum value: 1, maximum value: 5, default initial value: 3. Unit: minutes.
C4	Pump start pressure ratio setting. Minimum value: 50, maximum value: 90, default initial value: 70. When the actual water pressure is lower than (set pressure × start pressure ratio), the pump will start.
C5	Low water temperature alarm switch. 0 = Off, 1 = On. Default is Off.
C6	High water temperature alarm threshold setting. Minimum value: 25, maximum value: 80, default initial value: 80. When the water temperature exceeds this threshold, a high temperature alarm is triggered.
C7	Low water temperature alarm switch. 0 = Off, 1 = On. Default is On.
C8	Pressure upper limit adjustment. Maximum value: 8.0.
C9	Logical option for pressure deviation judgment. When value = 0, the deviation between the set and actual pressure is ignored. When value = 1, the CA setting value is used for judgment.
CA	Pressure deviation ratio. The higher the value, the slower and smoother the outlet pressure change, but the response time will be slower. Default value: 3, minimum value: 2, maximum value: 20.
F1–F4	Motor parameters. Not adjustable by the user.

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Function Description

Function	Notes
Low-Water Protection	When the pump fails to draw in water or the pressure remains below 0.5 (default) for more than 30 seconds (default), a “Low-Water” fault alarm will occur. The “Low-Water” indicator light will flash. When the water inlet or water supply resumes, press the reset/start button to clear the fault and restore normal operation.
Anti-Freeze Protection	When the internal water temperature of the pump is below 3°C and the pump has not operated for a while, the system enters anti-freeze protection mode. The motor will intermittently run for 5 minutes (or a user-set duration) to prevent freezing. During this process, the “Low-Water” indicator light will flash.

Fault Troubleshooting Table

Fault Code	Description	Solution
E01	Low voltage	Check controller input voltage
E02	High voltage	Check controller input voltage
E03	Sensor fault	Check connection between controller and sensor
E04	Module over-temperature	Check controller cooling
E05	Software overflow	Contact after-sales service
E06	Hardware overflow	Contact after-sales service
E07	Current sampling offset error	Contact after-sales service
E08	Start-up failure	Contact after-sales service
E09	Phase-loss fault	Check motor connection wiring
E10	Stall fault	Check whether there are foreign objects in the pump cavity
E11	Communication fault 01	Check connection between main board and panel
E12	High-temperature alarm	Wait for water temperature to drop or raise threshold
E22	Communication fault 02	Check connection between main board and panel
E21	Communication fault 03	Check connection between main board and panel

Solutions for Pump Not Starting or Not Stopping

Fault	Cause	Diagnosis Method	Solution
Pump not starting	The water tower or water tank mode has not reached the set time, so the pump cannot start	Observe if the indicator light for tower/tank mode is on	Wait until the long-delay timer finishes, then switch to constant pressure mode
Pump not starting	Pump stop button pressed	Observe if the logo light is always on	Press the start/stop button once
Pump not starting	Pipeline already filled with water	Manually stop the pump and observe the actual pressure change. If the actual pressure is greater than the set start pressure ratio (default 70%)	Increase the set pressure. If even at maximum the actual pressure is still higher than the start pressure ratio (default 70%), go to setting C8 to lower the set pressure upper limit
Pump not starting	Low water level alarm or the water level has stayed below the value (default 0.5m) for more than 3 minutes	Check whether the water tank is empty	Confirm whether the inlet pipe has sucked in air. Check whether the sensor is dry. If the maximum detected water pressure is lower than 0.5, go to setting C2 to calibrate or adjust the water level probe
Pump not starting	Pump failure	Check if the failure indicator light is on, and whether the digital tube shows a fault code	Refer to the manual or video for fault code troubleshooting
Pump not stopping	Inlet pipe without a check valve	Close the outlet valve, press the start/stop button, and observe whether the pressure drops. If there is a drop, the check valve is installed; if not, it’s missing	Install a check valve at the water inlet
Pump not stopping	Set pressure too low	Close the outlet valve, and if the actual pressure is less than the set stop pressure ratio (default 70%)	Lower the stop pressure setting or increase the shutoff pressure
Pump not stopping	Pipeline leakage	Close the outlet valve, press the start/stop button, and observe whether the pressure slowly decreases	Check the pipeline and faucets for leaks
Pump not stopping	Pressure tank membrane damage or air loss	Use a screwdriver to press the valve core inside the pressure tank air nozzle. If air comes out steadily, the tank is fine. If water comes out, the membrane is damaged. If neither air nor water comes out, the tank is full of water.	Recharge the pressure tank with air or replace the damaged membrane (slowly inflate with a hand pump or inflator until water flows out properly)