W1209 Digital Temperature Controller Switch 12V DC — Heat / Cool Thermostat Module - AA178

Description:

Meet the W1209 Digital Temperature Controller Switch — a compact, powerful, and easy-to-use thermostat module to automate heating or cooling systems based on temperature thresholds. This module is ideal for incubators, greenhouses, aquarium controllers, HVAC systems, and many DIY embedded automation projects.

With a user-friendly interface (three push-buttons), built-in microcontroller (no programming charge), and a robust relay output, the W1209 delivers reliable temperature control in a small form factor. It supports both heating and cooling control modes, hysteresis settings, delay start, limit alarms, and temperature calibration — making it versatile for many control tasks.

Specifications:

• Model Type: Temperature Controller
• Voltage Rating: 12VDC
• Model No.: XH W1209
• Accuracy: ± 0.1°C
• Refresh Rate: 0.5 Sec
• Measuring inputs: NTC10K
• Cable Length: 50cm
• Output Type: 1 Channel Relay Output
• Max Capacity: 10A

Lights, LED Status Descriptions:

• Indicator: Off. The relay is switched off. Always indicate the relay is closed.
• LED: Shows LL is the sensor open, showing HH is out of range, the thermostat will be forced to close the relay, and the display --- as high-temperature protection.

Wiring & Usage Instructions:

• Power Input: Connect +12 V DC to VCC, and the negative side to GND. Ensure stable voltage.
• Sensor Connection: Insert the provided NTC sensor into the white connector (polarity-insensitive).
• Load Connection: Wire your heating/cooling device through the relay contacts (K0 / K1 / COM). Choose normally open vs normally closed based on usage.
• Set Temperature: Press SET once to adjust the trigger temperature; use + / – to change it (steps of 0.1 °C).
• Configure Parameters: Long-press SET (≈5 seconds) to enter menu P0–P6. Use + / – to navigate and set hysteresis, limits, mode (C/H), delay, calibration, alarm.
• Return to Display: After ~5 seconds of no button activity, module returns to showing measured temperature.
• Behavior:
  • Cooling mode (P0 = C): relay turns ON when measured temperature ≥ setpoint; turns OFF when drops below (minus hysteresis).
  • Heating mode (P0 = H): relay turns ON when measured temperature ≤ setpoint; turns OFF when rises above (plus hysteresis).
  • High-temp alarm (P6) triggers relay OFF if threshold exceeded; display shows ---.
• ⚠️ Tip: Avoid placing sensor too close to the module’s heat-emitting components (relay), or you may get false readings.

Package Included:

• 1 x W1209 Digital Temperature Controller Switch