The HL109 FCU series is a highly cost effective standalone thermostat with basic and stable functionalities. It controls room temperature by driving normal 3-Speed fan and On-Off valve (2/4 pipe) of a FCU.
The ViviD Series color touchscreen thermostat combines a sleek color display with a concise, intuitive user interface for smooth, efficient daily interaction. As a smart room thermostat, it delivers precise temperature control while offering practical comfort features such as a nighttime dimmer, configurable display and scenario mode control, so the device adapts to how a space is actually used throughout the day.
Beyond local operation, the ViviD-Series thermostat supports programmable local schedules and remote control via a free mobile app, making it easy for homeowners, facility managers and installers to improve comfort while reducing energy consumption. This makes it a strong fit as a hydronic floor heating thermostat and as a control solution for combined FCU (fan coil unit) + hydronic floor heating systems, where accurate, zone-level temperature control is essential.
For system integrators, the ViviD Series includes one RS-485 port, enabling seamless integration into a BA (Building Automation) System via the Modbus-RTU protocol — making it suitable not only for residential projects but also for commercial and light-commercial HVAC control networks that require centralized monitoring and management.
Color Touch Screen
A vivid, responsive 480×320 color TFT display delivers clear temperature readouts and an intuitive touch interface for effortless daily control.
Configurable Display & Adjustable Brightness
Display layout and brightness can be customized to match the room environment, keeping information legible day and night.
Nighttime Dimmer
Automatically reduces screen brightness at night to avoid disturbing sleep while keeping essential temperature information visible.
Button Lock with User Privilege Access
Protects settings from accidental or unauthorized changes — useful in shared spaces, hotels, and commercial buildings.
Scenario Mode Control
Lets users switch between preset comfort modes (e.g. Home, Away, Sleep) for fast, one-touch adjustment of heating behavior.
Upon Power Restoration
Automatically resumes the last operating state after a power interruption, so heating schedules aren't lost during outages.
Programmable Schedule & On/Off Timer
Supports a 7-day, 4-event weekly schedule, allowing precise, automated temperature control tailored to daily routines.
Remote Sensor / Room Card Input (1 UI)
One universal input can connect a remote temperature sensor or a hotel-style room card switch for flexible installation scenarios.
Linked Control Output (1 DO)
A dedicated digital output enables linked control of an external device such as a valve actuator or ventilation fan.
Anti-Freezing Protection
Automatically activates heating when room temperature drops below a safe threshold, protecting pipework and equipment from freeze damage.
Configurable Hysteresis
Allows fine-tuning of the temperature control band to balance comfort and equipment cycling frequency.
OTA Firmware Updates
Supports over-the-air updates, keeping the thermostat's features and security current without on-site reprogramming.
Wi-Fi + RS-485 Dual Communication
Combines Wi-Fi connectivity for app-based remote control with an RS-485 Modbus-RTU port for professional BA system integration — giving installers flexibility for both residential and commercial projects.
| Parameter | Detail |
| Room temperature accuracy | ±1°C |
| Display temperature resolution | 0.1°C |
| Display | Color TFT screen, 480 × 320 |
| Power consumption | <3W |
| Operating temperature range | 0–50°C |
| Operating humidity range | 5–95% RH (non-condensing) |
| Power supply | AC 85–250V, 50/60Hz |
| Terminations | One 2.5mm² or two 1.5mm² wires |
| Max load current | <2A (resistive), <1A (inductive) |
| Dimensions (H×W×D) | 86 × 86 × 12 mm |
| Mounting hole diameter | 60mm |
| Protection class | IP30 |
| Model | Application | Commun ication | Certificate | FCU/Stage | Power Supply | IP level | Timer | Schedule |
| HL109DA2-L | FCU(ON/OFF valve & 3 speed fan) | - | - | 2-pipe | 90-240VAC | IP30 | - | - |
| HL109FCV2-L | FCU(ON/OFF valve & 3 speed fan) | - | - | 2/4-pipe | 90-240VAC | IP30 | - | - |

Installation Instructions
The ViviD Series thermostat is designed for precise zone-level heating control in a range of building types, including:
Residential hydronic floor heating — apartments, villas and single-family homes using radiant floor heating systems
Combined FCU + floor heating systems — 2-pipe fan coil units paired with underfloor heating for hybrid comfort control
Hotel guest rooms — button-lock and room-card compatibility support hospitality-grade energy management
Commercial and light-commercial buildings — RS-485/Modbus-RTU integration allows the thermostat to be managed centrally as part of a BA (Building Automation) System
Smart home / connected heating projects — Wi-Fi connectivity and free mobile app support enable remote scheduling and monitoring from anywhere
This flexibility makes the ViviD Series suitable for both standalone smart-home installations and networked commercial HVAC control projects.
Established HVAC and building automation manufacturer with a broad thermostat, sensor, valve and controller product line
CE-certified products designed for both residential and commercial HVAC control projects
RS-485 / Modbus-RTU support across the ViviD Series for easy integration into third-party BA systems
Free mobile app for remote scheduling and monitoring, alongside local programmable control
Responsive technical support and a network of 100+ agents covering 200+ cities in China, plus international project experience
Full product documentation and installation manuals available for download
Related solutions: Commercial Building/Complex · Hotel Building Automation Solution · Residential Community Solution
Q1: Can the ViviD Series thermostat control both floor heating and a fan coil unit?
Yes. The ViviD-FW model is specifically designed for FCU + hydronic floor heating (2-pipe) systems, while the ViviD-W model is optimized for floor-heating-only installations.
Q2: Does the ViviD thermostat support remote control away from home?
Yes. In addition to local touchscreen and programmable schedule control, the ViviD Series connects via Wi-Fi to a free mobile app, allowing remote temperature adjustment and schedule management from anywhere.
Q3: Can the ViviD Series be integrated into a Building Automation (BA) System?
Yes. Each unit includes one RS-485 port supporting the Modbus-RTU protocol, allowing integration with third-party BA systems for centralized monitoring and control — ideal for hotels, offices and commercial buildings.
Q4: What happens to the thermostat's settings after a power outage?
The "Upon Power Restoration" feature automatically resumes the previous operating state once power returns, so schedules and setpoints are not lost.
Q5: Is the ViviD Series suitable for cold-climate installations?
Yes. The thermostat includes anti-freezing protection, which automatically activates heating when room temperature drops below a safe threshold to protect pipework from freeze damage.
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