Automatic Self Cleaning Filter for Heating and Ventilating Air Conditioning System

How It Works
The system is designed with a two-stage filtration process. First, a coarse pre-filter captures large particles, while the second stage uses a stainless steel fine screen to remove smaller impurities. As dirt accumulates on the inner surface of the fine screen, it forms a filter cake that enhances filtration efficiency. When the pressure differential reaches a preset threshold, the factory-provided control system initiates a backwashing cycle. This process uses a targeted backwash method to suction dirt off the screen, similar to a vacuum cleaner, and directs it through a rinse valve to the drain. The dirt collector rotates, ensuring full coverage of the screen during each cleaning cycle. This entire process takes just seconds without interrupting the system flow.

Control Method
The filter includes a differential switch and integrator. Once the pressure drop reaches a set point, the PLC controller activates the rinse cycle, ensuring efficient and automatic operation.

Features
Compact design, low water consumption, fine filtration, and minimal pressure drop make this filter ideal for various applications.

Applications
1. Chilling water treatment: Cooling towers, water supply systems, air conditioning units, and heat exchangers.
2. Raw water treatment: Surface water, lakes, seawater, tank water, and well water for removing sand, algae, and organisms.
3. Industrial water: Cooling towers, polishing processes, ion exchange, spraying, heat exchange plants, rolling mills, and casting facilities.
4. Irrigation: Farms, golf courses, lawns, and agricultural fields.
5. Recycled water systems.

Filter Degree

Micron	100	120	150	200	400	800	1500	3000
Mesh	150	120	100	80	40	20	10	5

Horizontal Type


 

Model	Pipe	T/H	Filter Area (cm²)	Drain (mm)	Water Consumption (L)	Motor (Kw)	Weight (KG)
XLQ-50XM	50	20	1500	50	75	0.55	85
XLQ-80XM	80	50	1500	50	75	0.55	87
XLQ-100XM	100	80	3000	50	150	0.55	210
XLQ-125XM	125	100	3000	50	150	0.55	212
XLQ-150XM	150	150	7000	50	150	0.55	220
XLQ-200XM	200	300	7000	50	150	0.55	220
XLQ-250XM	250	450	11000	80	400	0.55	395
XLQ-300XM	300	600	11000	80	400	0.55	405
XLQ-350XM	350	900	13500	80	400	0.55	625

 

Install Way	Horizontal
Unit Capacity	15-900T/H, Achieve parallel install to achieve big capacity
Min Work Pressure	0.25Mpa
Max Work Pressure	1.0Mpa, 1.6Mpa
Micron	80-500um
Control Way	Differential pressure, time and manual
Max Temperature	65ºC (reach to 100ºC if required)
Back Wash Time	50-90S
Rotating Speed	14-20rpm
Clean Way	Scanning type
Differential Pressure in Cleaning	0.01-0.08Mpa
Back Wash Water Consumption	Approximate 280-310kg
Voltage	AC220V 380V, 50Hz, 3PH, Controller: 220V
Motor Power	0.37Kw
Material	Carbon steel with anti-corrosion painting
Screen	Multi stainless steel mesh + PVC structure
Drain Valve	Cast iron with anti-corrosion painting
PLC controller

Pressure Drop VS Flow Rate



Vertical Type


 

Model	Pipe	T/H	Filter area(cm²)	Drain(mm)	Water consumption (L)	motor(KW)	weight(KG)
XLQ-200XT	200	300	7500	50	250	0.55	340
XLQ-250XT	250	450	11000	80	400	0.55	350
XLQ-300XT	300	650	11000	80	400	0.55	365
XLQ-350XT	350	900	13800	80	400	0.55	630
XLQ-400XT	400	1200	13800	80	400	0.55	650
XLQ-350XT	350	1500	13800	80	400	0.55	690

 

Install Way	Vertical installation
Unit Capacity	15-900T/H, Achieve parallel install to achieve big capacity
Min Work Pressure	0.25Mpa
Max Work Pressure	1.0Mpa, 1.6Mpa
Micron	20-500um
Control Way	Differential pressure, time and manual
Max Temperature	65ºC (reach to 100ºC if required)
Back Wash Time	60-120S
Rotating Speed	14-20rpm
Clean Way	Scanning type
Differential Pressure in Cleaning	0.01-0.08Mpa
Back Wash Water Consumption	Approximate 500kg
Voltage	AC220V 380V, 50Hz, 3PH, Controller: 220V
Motor Power	0.37Kw
Material	Carbon steel with anti-corrosion painting
Screen	316SS (Woven, multi-layer sintered, wedge)
Drain Valve	cast iron with anti-corrosion painting
PLC controller

Pressure Drop VS Flow Rate





Installation Notice

1. A check valve must be installed at the filter outlet. Avoid return pressure and backflow to prevent damage to the screen.
2. If the system working pressure exceeds 0.8MPa, install a break valve on the drain pipe to reduce impact on the screen.
3. Check the motor rotation direction. Immediately cut power if it rotates backward (anti-clockwise).
4. Install all parts according to the arrow directions.
5. Avoid sudden pressure release at the outlet. For example, if a branch valve is opened suddenly at the outlet under normal pressure of 1.3MPa, it may cause an instant large pressure difference, damaging the screen.
6. Ensure the filter operates within the correct working pressure and capacity.
7. If alarms occur, open the bypass valve for temporary backwashing solutions.
8. Ensure the control box has a stable power supply. In case of power failure, open the bypass valve, close the inlet and outlet valves, and turn off the control box switch.


Installation View



The video of working principle: https://www.youtube.com/watch?v=61YAxgeWdro
 

 

Installation Requirement

1. Keep enough space for filter installation and maintenance.
2. Drainage pipe length should not exceed 20m. Avoid sharp turns and keep the outlet pipe parallel to the ground.

Water Filter Testing

1. Close the inlet and outlet valves before testing. Open the bypass valve to clean any dirt in the pipes.
2. Gradually open the inlet valve until water flows into the filter and air exits from the housing.
3. Check for leaks at the joints and verify the inlet and outlet pressure gauges. Connect power when the system reaches operating pressure.
4. Set the drainage time based on the system pressure data.
5. If the test is normal, gradually open the outlet valve and close the bypass valve to resume normal filtering.
6. Observe several differential pressure changes and drainage cycles. Finish the test if everything is normal.

The equipment can be put into operation directly after trial testing. Users can adjust settings as needed. Changing relay programs or parameters is not recommended.

First Operation Notice: Follow these steps for the first operation: Check the drainage pipe connection. Ensure no upward incline. Verify that all connections are tight. Place the control box in a dry environment. Connect the power cord; a green light indicates normal operation. Ensure electrical parts remain dry. Do not allow water to enter the control box.


Internal Fitting







 

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