8819RHKLD FCU & Floor Heating Thermostat
Key Specifications
· Integrated AC & floor heating thermostat for fan coil unit (FCU) and hydronic floor heating (water system)
· WiFi Tuya App (optional) · RS485 connecting interface (optional)
· Built-in two-pipe & four-pipe systems with integrated AC/UFH control program
· 86×86×43mm · 146g
Why Choose 8819RHKLD
· WiFi Tuya App – Optional remote control via Tuya App for smart scheduling and operation
· RS485 Modbus – Optional RS485 interface for building automation and central control
· 2-Pipe / 4-Pipe Ready – Built-in support for two-pipe and four-pipe fan coil systems with integrated AC and floor heating control logic
· FCU + Floor Heating Combo – One thermostat controls both fan coil (chilled/hot water) and water floor heating terminals
· 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.