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BF-3030 Three period heating,water feeding and timing controller

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Functions overview

BF-3030, featuring compact construction but powerful functions, can be widely used in solar water heating systems, solar and heat pump water heating systems, etc.

The controller enables the timed heating and water feeding functions respectively to be performed in three defined time segments (i.e., cycles) every day, and allows users to set the water level for each timed water feeding cycle separately.It also features some other important functions, such as thermostatic water feeding, forced water feeding at low water level, and protection against dry heating in case of water-shortage.

The current water temperature, current time, and current water level can be displayed in real time during operation (the water level is displayed in 4 colors).

With the manual water feeding and manual electric heating functions, it is able to ensure easy system commissioning and manual intervention.

Thanks to the wide range of rated power supply, the controller is able to ensure stable, reliable and durable operation by adapting to AC80V240V power supply.


Main Features

  • One-channel 240K NTC temperature sensor input, one-set AT35-7 water level sensor input

  • One-channel heating control NO/NC contact output, two-channel water feeding NO contact output

  • Display of time, temperature and water level (in percentage)

  • Able to control the heating operation by setting up 3 cycles every day

  • Able to control the water feeding operation by setting up 3 cycles every day

  • Able to set up the full water level for 3 water feeding cycles separately

  • Automatically activate the thermostatic water feeding mode out of timed heating and water feeding cycles

  • Manual heating, manual water feeding

  • Temperature measurement deviation correction

  • Forced water feeding to 50% in case of water level <   30% (can be disenabled)

  • Protect against dry heating in case of water level <   30%

  • Keep the running time after power failure

  • Memorize the control parameters for a long time after power failure

Specifications and Technical Data

Packing List of Product

1. Main unit

2. 1 x NTC (240K) temperature sensing wire, 1 x AT35-7 water level sensing wire kit

3. User instructions

4. M29 water level pinboard

5. Waterproof cover

6. Mounting bracket

Overall Dimensions (mm)

58 (L) × 78 (W) × 85 (T)

Installation and Dimensions (mm)

Window-mounted, opening size: 51 (L) ×71 (W)


Net weight: 0.474 Kg

Gross weight: 0.624 Kg

Power Supply and Consumption Power

AC (80240)V, 2W

Operating Conditions

-10℃ ~ 50℃

Display Mode

LED digital display


Push-type membrane keys


One-channel 240K NTC thermistor temperature sensor input, measuring range: -20140 ℃;

One-channel AT35-7 water level sensor input, measuring range: 0%, 30%, 50%, 80%, 100%.


1. One-channel relay NO/NC contact temperature control output, two-channel relay NO contact water feeding output.

2. Current capacity of each channel contact: 6 A (resistive load) and 1 A (inductive load)

Able to control a 1000W electric heater or a 200W motor or water pump. AC contactor required for capacity expansion in case of larger load.

Timing Range


Measurement Range

Display range of temperature sensor measurement: 099 ℃

Measurement range of water level sensor: 0%, 30%, 50%, 80%, 100%.

Setting Range

Setting range of temperature: 099℃

Setting range of water level: 0%, 30%, 50%, 80%, 100%.

Control Range

Control range of temperature: 099℃

Control range of water level: 0%, 30%, 50%, 80%, 100%

Other Parameters

1. Temperature sensing wire can be extended by 100 m with ordinary wire for long-distance connection

2. Memorize the set parameter for a long time after power failure

3. Temperature control hysteresis difference: 2-20℃

4. Setting range of refilling water level: 0%, 30%, 50%, 80%, 100%

5. The controller, if fully charged, can keep running for more than 72 hours after power failure

Power Supply and Input & Output Ports


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