ENGO EFAN-230B Wi-Fi Fan Coil Thermostat, 230V, Black - MODBUS RS-485
The ENGO EFAN-230B is a wireless, flush-mounted fan coil thermostat designed to control 2-pipe and 4-pipe fan coil units as well as duct heaters, with dedicated support for mixed systems combining fan coil cooling with underfloor heating. Built around 2.4GHz Wi-Fi and MODBUS RS-485 communication, it integrates directly into smart home platforms and BMS/building automation networks, giving installers a single controller for a wide range of HVAC configurations. Onboard control of 3-speed 230V fans is handled automatically via the Delta FAN algorithm, or manually from the device or the ENGO Smart app. Built-in frost and overheat protection, ECO mode, and memory retention after a power loss round out a controller aimed at both residential and light commercial installations such as offices, apartments and hotel rooms. 230V AC Power Supply 5(2)A Output Load 2 / 4-Pipe Fan Coil Support Wi-Fi 2.4GHz + MODBUS RS-485 5–45°C Setpoint Range 90×90×44mm Dimensions Installer-Only Wiring This thermostat is powered by 230V AC mains supply and switches 230V AC valve and fan outputs directly. Installation, wiring, and connection work must be carried out by a qualified, appropriately licensed electrician in accordance with local and EU wiring regulations. Always isolate the mains supply to both the thermostat and the connected heat/cool source before working on the unit. Model Variant Note The EFAN-230B is the black-cased, 230V AC version of ENGO's Wi-Fi fan coil thermostat range (model code 932310554). A separate 24V DC version (EFAN-24B/EFAN-24W) exists with different wiring terminals (0–10V fan/valve outputs) — the specifications on this page apply to the 230V AC EFAN-230B only. Always confirm the voltage rating on the unit's rear label matches your system before wiring. ENGO Smart App Control The EFAN-230B connects to the free ENGO Smart app (iOS 9.0+ / Android 5.0+) via Tuya Cloud, enabling remote setpoint changes, 6-point daily scheduling, temperature history graphs, and voice control through Amazon Alexa and Google Assistant. Dual-Protocol Communication Combines 2.4GHz Wi-Fi for app/cloud control with MODBUS RS-485 for direct integration into BMS and building automation systems — one device covers both smart-home and commercial control architectures. Flexible Fan Coil Configurations Supports 2-pipe heating-only, cooling-only, and heating/cooling systems as well as 4-pipe simultaneous heating and cooling, switched manually, via external volt-free contact, or automatically from a pipe or room air temperature sensor. Mixed System Support Can independently drive a 2-pipe fan coil circuit alongside a separate underfloor heating circuit from the same controller, using the V1 and V2 valve outputs. Delta FAN Adaptive Speed Control Automatically ramps 3-speed fan output in proportion to the gap between room and setpoint temperature, with independently configurable heating and cooling response ranges (Delta FAN Heating/Cooling, 1–10°C) to balance comfort against fan noise. TPI Algorithm for Underfloor Heating When configured for underfloor heating, the controller can switch from standard hysteresis to a Time Proportional and Integral (TPI) algorithm, pulsing the valve in short, adaptive bursts to reduce the overshoot typical of high thermal-inertia systems. Frost and Overheat Protection A dedicated FROST mode holds a constant, selectable setpoint between 5–17°C, activating heating automatically if the room temperature drops below the threshold — protecting pipework and fan coil units during unoccupied periods. Multi-Function Auxiliary Inputs The S1-COM input can serve as a pipe sensor, heating/cooling mode switch, or floor sensor input, while S2-COM can act as an ECO-mode occupancy switch or an external NTC air temperature sensor — reducing the need for additional controllers. Settings Retained After Power Loss All schedules, setpoints, and installer parameter settings are retained through a power interruption, so the controller resumes its exact prior configuration once power is restored. Power & Electrical Power supply 230V AC, 50Hz Valve control outputs (V1, V2) 230V AC, 5(2)A Fan control outputs (F1, F2, F3) 230V AC, 5(2)A — I / II / III fan speed Inputs (S1/COM, S2/COM) Temperature sensor or volt-free contact Control & Sensing Temperature setpoint range 5.0°C to 45.0°C Displayed temperature accuracy 0.1°C or 0.5°C (selectable) Control algorithm Delta FAN, Hysteresis (±0.1°C to ±2.0°C), TPI (underfloor heating) Temperature correction ±3.0°C in 0.5°C steps Frost (anti-freeze) setpoint range 5°C to 17°C Humidity measurement Yes, built-in Communication Wireless Wi-Fi 2.4GHz (IEEE 802.11 b/g/n) Wired bus MODBUS RTU via RS-485 (A+/B-), up to 247 slave devices App compatibility ENGO Smart app — Android 5.0+ / iOS 9.0+ Voice control Amazon Alexa, Google Assistant Physical & Compliance Dimensions 90 x 90 x 44mm (13mm projection after flush-box mounting) Mounting Flush-mounted, 60mm back box Housing colour Black Model / product code EFAN-230B — 932310554 EAN 5905481996628 EU compliance 2014/53/EU (RED), 2011/65/EU (RoHS) Warranty 5 years from date of installation Can the EFAN-230B control underfloor heating as well as a fan coil unit? Yes. It supports a mixed system configuration where one 2-pipe fan coil circuit (heating or cooling) is controlled via output V1, and a separate underfloor heating circuit is controlled via output V2, each managed independently by the thermostat. What's the difference between the EFAN-230B and EFAN-230W? The EFAN-230B and EFAN-230W share identical 230V AC electrical specifications and functionality — the only difference is the housing colour (black for the -B, white for the -W). Does the EFAN-230B work without an internet connection? The thermostat can be operated locally using its 3 side buttons for manual mode, schedule mode, and fan speed changes without any internet connection. Wi-Fi and the ENGO Smart app are only required for remote control, scheduling from a phone, and voice assistant integration. Can this thermostat automatically switch between heating and cooling? Yes. Using the S1-COM input with a pipe or room sensor, or an external volt-free contact, the EFAN-230B can automatically switch a 2-pipe system between heating and cooling based on pipe temperature thresholds, or switch a 4-pipe system based on room temperature and a configurable dead zone. How many devices can be linked on the MODBUS RS-485 bus? Up to 247 slave devices can share a single MODBUS RTU network, each requiring a unique address. ENGO recommends a linear (daisy-chain) bus topology with 120Ω termination resistors at each end, avoiding star wiring. What happens to my settings if there's a power cut? All setpoints, schedules, and installer parameters are stored in memory and automatically restored once power returns — there's no need to reconfigure the thermostat after a power interruption.