HS-BLH-R1LV-P2.0 Instant Electric Water Heater PCBA

# HS-BLH-R1LV-P2.0 Instant Electric Water Heater PCBA

The HS-BLH-R1LV-P2.0 is a customizable instant electric water heater PCBA designed for residential and commercial point-of-use water-heating equipment. Combined with the HS-CN-24030-5KEY-C1.3 display board, it integrates wide-voltage operation, five-key touch control, adjustable power settings, water-flow detection, intelligent constant-temperature control, setting memory, and multiple safety protection functions.

## Wide-Voltage Power Supply Design

The standard switching power supply version supports an input voltage range of 85–280 VAC, making the PCBA suitable for markets with different mains voltage conditions. An optional transformer-based version supporting 180–265 VAC is also available.

During sample verification, the switching power supply version operated continuously for eight hours at 280 VAC without abnormal behavior. The transformer version also completed an eight-hour continuous operation test at 265 VAC.

## Three Adjustable Power Settings

The controller provides three configurable power settings:

- 3.5 kW

- 4.5 kW

- 5.5 kW

Pressing and holding the constant-temperature key for five seconds during operation activates the power-setting mode. The selected power setting can be stored in memory for future operation.

The final rated power depends on the complete appliance design, including the heating element, power components, wiring, terminals, and heat-dissipation structure.

## Five-Key Touch Control

The display board features a five-key touch interface with the following functions:

- Power level selection

- Temperature decrease

- Power on/off

- Temperature increase

- Constant-temperature mode

The touch keys can operate through a 4 mm glass panel or a 2 mm plastic panel. Pressing and holding the increase or decrease key for more than one second enables continuous adjustment. Each valid key operation is confirmed by an audible buzzer tone.

## Intelligent Display and Sleep Mode

After power is applied, the controller produces one buzzer tone and performs a full-screen display check. When no water flow is detected, the display enters sleep mode after 30 seconds. Water flow automatically wakes the display.

The display can indicate:

- Inlet water temperature

- Set temperature

- Actual outlet temperature

- Water-flow status

- Heating status

- Constant-temperature mode

- Intelligent temperature-control status

- Energy-saving status

- Excessive water-flow warning

The heating indicator illuminates only when the heating circuit is active.

## Constant-Temperature Control

The adjustable temperature range is 30–55°C. A 50K NTC sensor is used for temperature detection, while the control program supports automatic constant-temperature calibration and parameter memory.

The controller remembers the selected temperature and power setting after shutdown. Its default state after power is applied is power-off, helping prevent unintended automatic heating.

Under sample test conditions with a 26°C inlet water temperature and flow rates of 1.5–3.0 L/min, the tested 30–48°C setpoints stabilized within 20 seconds after initial temperature-learning calibration.

## Water-Flow Detection

The controller uses a four-wire water-flow switch to manage heating activation and shutdown.

- Activation flow rate: 1.4 L/min

- Shutoff flow rate: 1.2 L/min

An excessive water-flow indicator is also available to help users identify operating conditions that may affect the outlet water temperature.

## Integrated Safety Protection

The instant electric water heater control board supports multiple fault-detection and protection functions, including:

- Over-temperature protection

- Leakage-current protection

- Inlet temperature sensor open-circuit detection

- Inlet temperature sensor short-circuit detection

- Outlet temperature sensor open-circuit detection

- Outlet temperature sensor short-circuit detection

- Zero-crossing fault detection

- Communication fault protection

- Excessive water-flow indication

When the detected temperature reaches 65°C or above, the controller stops heating and activates an alarm. Heating automatically resumes after the temperature decreases to 50°C.

The leakage detection range is 15–28 mA, with a measured sample value of 25 mA.

## Sample Reliability Verification

The sample completed a series of internal verification tests, including:

- Eight-hour continuous operation at 280 VAC

- Eight-hour operation at 65°C and 90% RH

- Complete-appliance dielectric testing at 1,800 V and 5 mA for one minute

- Fluorescent-lamp switching interference testing repeated 30 times

- Normal-temperature water testing

- Circulating-water testing

- Constant-temperature testing at different flow rates and setpoints

The specified operating environment is −15°C to 65°C with a relative humidity range of 10–95% RH.

## Application Scenarios

This instant electric water heater PCBA is suitable for:

- Instant electric shower heaters

- Wall-mounted electric water heaters

- Kitchen instant water heaters

- Washbasin water heaters

- Compact household hot-water appliances

- Commercial point-of-use water heaters

- Customized OEM and ODM water-heating equipment

## OEM and ODM Manufacturing Support

With 15 years of PCBA manufacturing and product development experience, SunSam provides hardware development, firmware programming, SMT assembly, wave soldering, display-board production, functional testing, traceability management, and volume manufacturing services.

The board dimensions, connectors, display icons, key layout, power settings, temperature range, protection thresholds, sensor logic, and control program can be customized according to the customer’s appliance design.

From prototype verification to volume production, SunSam provides a complete instant electric water heater PCBA solution for appliance manufacturers and brand customers.