8902RHKLD Tuya WiFi thermostat for FCU and floor heating
Key Specifications
· 2-in-1 thermostat for FCU (fan coil) and water floor heating
· WiFi Tuya App (optional)
· Built-in two-pipe & four-pipe systems with integrated AC/UFH control program
· 86×86×43mm · 146g
The 8902RHKLD is a Tuya WiFi thermostat for FCU and floor heating systems. It features built-in 2-pipe and 4-pipe control logic with integrated AC and floor heating programs. The compact 86x86x43mm size and 146g weight make it easy to install in standard wall boxes.
This thermostat supports Modbus RTU communication. For official protocol details, visit the Modbus Organization website.
Why Choose 8902RHKLD Tuya WiFi thermostat for FCU and floor heating
· FCU + Floor Heating Combo – One thermostat controls both fan coil unit (chilled/hot water) and hydronic floor heating
· 2-Pipe / 4-Pipe Ready – Built-in support for two-pipe and four-pipe fan coil systems with integrated control logic
· WiFi Tuya App – Optional smart control via Tuya App for remote operation and scheduling
· Compact Size – 86×86×43mm fits standard wall boxes
· Lightweight – Only 146g for easy installation
Operation Functions
1. Basic Operation Modes
– Power On/Off: One-key control to turn the thermostat on or off.
– Cooling Mode: Provides cooling and controls the cooling valve.
– Heating Mode: Provides heating and controls the heating valve.
– Fan Mode: Runs fan only without cooling or heating.
– Fan Speed: Adjustable to Low, Medium, High, and Auto.
2. Temperature Adjustment
– Manually set desired temperature between 5°C and 35°C.
– High precision temperature control with ±1°C accuracy.
3. Child Lock & Timer Function
– Child Lock: Prevents misoperation by children.
– Timer: Supports 3-period cycle timer for auto on/off control.
4. Sleep Mode
– Automatically adjusts temperature for comfortable sleeping.
– Runs for 8 hours then exits automatically, saving energy.
5. Time Setting
– Allows manual time adjustment.
– WiFi version syncs time automatically from the internet.
6. Temperature Calibration
– Calibrates temperature display for accurate reading.
7. Power Failure Memory
– Restores previous settings automatically after power recovery.
8. Anti-Freezing Protection (Optional)
– Activates output automatically at low temperature to prevent freezing.
9. Fault Alarm
– Shows E1 code and stops output when sensor error occurs.
10. Factory Reset
– Restores all parameters to default settings.
11. Advanced Settings
– System type, temperature limits, fan control, backlight, and more customizable parameters.