AC819F Digital Programmable WiFi RS485 FCU Thermostat — Flexible 2/4-Pipe Control for Smart Building Projects
WiFi + RS485 Dual Link
Built-in WiFi for mobile APP control and RS485 Modbus for BMS integration. One device, two connectivity options.
Programmable Scheduling
Set weekly temperature programs for automatic energy optimization. Reduce HVAC costs in unoccupied periods.
Flexible Installation
Standard 86×86mm wall-mounted design with quick-connect terminals. Compatible with global junction box standards.
Flame Retardant Safety
PC+ABS housing with fire-retardant certification. Meets international building safety codes for commercial use.
Global Voltage Ready
Wide-range power input adapts to regional electrical standards. One SKU for multi-country deployment.
3-Year Full Warranty
Free spare parts, online support, and replacement service. Built on 16 years of Telin HVAC manufacturing.
At a Glance
Product Overview
The AC819F is Telin’s flexible connectivity thermostat, offering both WiFi mobile APP control and RS485 Modbus BMS integration in a single device. Designed for 2-pipe and 4-pipe fan coil units, it delivers programmable temperature scheduling with energy-saving automation — ideal for hotels, commercial buildings, and smart residential projects requiring centralized or remote HVAC management.
With a wide price range of $8-19 per unit depending on configuration, the AC819F provides scalable connectivity from basic thermostat to fully networked building controller. Full OEM/ODM customization is available, backed by Telin’s 16-year HVAC manufacturing track record and ISO 9001 quality system.
Product Features
📶 Dual-Network Architecture
Unlike single-protocol thermostats, the AC819F integrates both WiFi (Tuya/Smart Life ecosystem) and RS485 Modbus interfaces. Facility managers can monitor all rooms from a central BMS dashboard while guests control their individual climate via a familiar mobile APP.
📅 Intelligent Energy Scheduling
Program different temperature setpoints for weekdays, weekends, and unoccupied periods. The AC819F automatically adjusts to reduce HVAC runtime by up to 25% — ideal for hotels aiming to cut operational costs without impacting guest experience.
🏘 Scalable Project Deployment
From 10-room boutique hotels to 500-room chain properties, the AC819F’s RS485 backbone enables cost-effective wiring while WiFi provides per-room user convenience. Upgrade paths are built in, not bolted on.
🔌 Simplified Field Installation
Standard 86×86mm footprint with clearly labeled screw terminals. Electricians familiar with conventional thermostats can install the AC819F without retraining — reducing project labor costs and installation errors on site.
Product Parameters
⚡ Electrical
📏 Mechanical
🌡 Environment
Dimensions & Installation
Application Scenarios
The AC819F’s dual connectivity makes it the ideal choice for any project requiring both centralized management and guest-facing control.
Chain Hotel
RS485 backbone for central monitoring, WiFi for guest room APP control. The complete hotel HVAC management solution.
Commercial Office
Modbus BMS integration enables zone-based scheduling and enterprise energy reporting across building floors.
Smart Residential
WiFi control from smartphone combined with programmable scheduling delivers premium home climate automation.
Ready to Discuss Your Project?
Get pricing, request samples, or consult our engineers about your custom HVAC control requirements.
Hubei Telin energy-saving equipment Co., Ltd (Production Base)
Add: No.1 Lingcheng Industrial Park, Lingxiang Town, Daye, Huangshi City, Hubei Province, China.
✉ sales@sztelin.com | ☎ +86 13410830001
