EC-MULTI
One gateway for up to 16 EC fans
EC-MULTI is an intelligent gateway designed to control up to 16 EC fans in a fan wall, with simple, high-performance centralised management.
It simplifies configuration, wiring and monitoring, while remaining compatible with the market’s standard protocols: Modbus RTU / Modbus TCP / BACnet IP / 0-10 V signal.
Thanks to its all-in-one architecture, EC-MULTI allows a common flow or pressure command while retaining individual diagnostics for each fan, guaranteeing continuous, safe ventilation even in the event of a partial failure.
One setpoint for the whole wall.
One diagnostic for every fan.
That is the EC-MULTI principle
Multi-fan wiring, simplified
In an installation with several EC fans, wiring and individual adjustment quickly become complex. The EC-MULTI gateway centralises all commands at a single point, automatically applying a common setpoint to all the fans, while monitoring each one.
The EC-MULTI demonstrator
A demonstration unit with six EC fans driven by a single gateway: the control cabinet, the motorised dampers and the fan wall, seen from the front, the side and the rear.
What is inside the boxes
Between the gateway and the fans sits one ModIO-P module per pair of fans. It reads the pressure, sends the control signal, measures temperatures, and passes a single bus cable on to the next one.
Sixteen fans therefore fit on eight modules, and the bus takes up to fifteen. The module behaves as a standard Modbus RTU slave: the gateway polls it, it publishes the state of its inputs, and the gateway writes its output setpoints.
What a ModIO-P holds
Fan control
Two 0, 10 V outputs and two 0, 10 V feedback inputs, with the 24 V supply for the actuators.
Pressure measurement
A differential pressure sensor, connected to the module’s extension port.
Temperatures
Two inputs for PT1000 probes.
Contacts
Two digital inputs and one volt-free relay output.
AC circuit
One AC input and one AC output, fuse-protected, with current measurement.
Power and bus
24 V AC/DC supply and Modbus RTU bus, three connectors to daisy-chain the modules, a rotary address selector and bus termination.
One fan down, ventilation carries on
A single motor failure should not shut down a building’s ventilation. EC-MULTI monitors every fan separately and shifts the load onto those still running.
1. Detection. Each fan’s status feedback is read individually: the fault is pinpointed rather than reported as a blanket “fan wall fault”.
2. Compensation. The setpoint of the remaining fans is raised to recover the required airflow or pressure.
3. Alarm reporting. The fault is passed to the BMS together with the identity of the fan concerned, so the intervention is planned instead of forced.
On a wall of six fans, losing one motor leaves five running. To recover the original airflow each must deliver roughly 20% more, which the available speed reserve allows, as long as the installation is not already running flat out.
The compensation has a physical limit: it only exists while speed reserve remains. A wall sized to run at full speed at its nominal duty point compensates for nothing, and the airflow falls in proportion to the fans lost. Designing that reserve in is what turns a fan wall into a genuinely redundant installation.
What the gateway changes on site and in operation
A single setpoint
Airflow or pressure: one setpoint applied to the whole wall, instead of fan-by-fan adjustment.
Simpler wiring
Commands and status feedback run through the module, with no individual wiring from each fan back to the control panel.
Per-fan diagnostics
Every fan is monitored separately. A fault is identified and located, not buried in a collective alarm.
Active redundancy
Lose one fan and the others take up the slack: the required airflow is held within the available reserve.
BMS-ready
Modbus RTU, Modbus TCP, BACnet IP or a 0, 10 V signal: the module fits into existing supervision.
Up to 16 fans
One module for the whole wall, without multiplying controllers or supervision points.
Simplify your multi-fan installations
Centralised control, BMS-compatible. Get in touch about your project.
Contact usWho EC-MULTI is for
Consulting engineers & designers
A documented fan wall: a common flow or pressure setpoint, per-fan diagnostics, and the speed reserve to size so that redundancy actually exists.
Request a quote →Installers & HVAC technicians
One module to wire instead of running a cable to every fan, and a single point for commissioning and adjustment.
Talk to a technician →Operators & property managers
A fault is located and reported to the BMS with the fan identified: the call-out is planned rather than endured.
Our after-sales service →