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BF-HS50 Return water controller of water tank and water pipe

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Functions overview

BF-HS50 water return controller is specially designed to control water return in pipelines, which can be triggered either by temperature or by water flow switch.


[Working Principle]:

(1) If triggered by temperature, the water return operation will be activated as long as the temperature is lower than the set value, provided the cycle time (00:0023:59 (min:sec)) elapses, and will last for the delay time (00:05 ~ 30:00 (min:sec)) before it is deactivated.

(2) If triggered by water flow switch, the water return operation will be activated once the water flow switch is actuated and will last for the delay time (00:05 ~ 30:00) before it is deactivated.HS50 features a pipeline anti-freeze circulation function, which can effectively prevent pipelines from freezing.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-channel water flow switch input

  • One-channel NO/NC contact output

  • Temperature display

  • Set up cycle to detect water return

  • Adjustable water return delay time

  • Adjustable water return temperature

  • Anti-freeze circulation

  • Memory protection after power failure

Specifications and Technical Data

Packing List of Product

1. Main unit

2. 1 x NTC (240K) temperature sensing wire

3. User instructions

4. 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: 0.240 Kg

Gross weight: 0.305 Kg

Power Supply and Consumption Power

AC (80240)V, 2W

Operating Conditions

-10℃ ~ 50℃

Display Mode

LED digital display


Push-type membrane keys


Two-channel (240K) NTC thermistor temperature sensor input, measurement range: -20 ℃120 ℃


1. One-channel relay NO/NC contact temperature control outputs; two-channel relay NO/NC contact temperature difference circulation outputs

2. Current capacity of each output 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.

Measurement Range

Display range of measurement in HT zone: 0120 ℃

Display range of measurement in LT zone: 099 ℃

Setting Range

Range of temperature control value: upper limit 090 ℃, lower limit 090 ℃

Range of temperature difference value: upper limit 230 ℃, lower limit 130 ℃

Control Range

Range of temperature control value: upper limit 090 ℃, lower limit 090 ℃

Range of temperature difference value: upper limit 230 ℃, lower limit 130 ℃

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. Setting range of anti-freeze activation temperature: -46 ℃

4. Setting range of anti-freeze deactivation temperature: 010 ℃

5. Setting range of water return delay time: 00:0530:00 (min:sec)

Power Supply and Input & Output Ports

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