EC-SWAP
Converting low/high speed commands into EC control
EC-SWAP converts the low-speed / high-speed command of an asynchronous ventilation motor into a control signal for an EC motor. The existing wiring, distribution board and MCR control system stay in place: no electrician work on the cabinet, and no PLC reprogramming.
One module per air stream. The module takes over the two existing supplies — low speed and high speed — coming from the board, powers the EC motor with three-phase 400 V, generates the 0–10 V setpoint corresponding to the requested speed and returns the fault contact to the control system.
EC-SWAP is part of Depair’s Controls range and complements our air handling unit renovationservices. For the coordinated management of several fans, see EC-MULTI.
Patented technology.
What you gain
Up to 70% savings
A major reduction in the energy consumption of your ventilation systems.
Less noise
A noticeable reduction in the installation’s sound level.
MCR compatible
Full compatibility with the existing automation, with no rewiring.
Intelligent ventilation
Control by air quality (CO₂ / VOC) is possible.
One module per air stream
Each module is installed as close as possible to the fan. The low-speed and high-speed cables coming from the board are connected as they are: from them the module draws the three-phase 400 V supply for the EC motor, the 24 V DC for the electronics, the 0–10 V command and the alarm feedback to the control system.
Logic and setpoints
Low/high speed logic
Two logics to choose from at commissioning: low-speed priority, low speed by default, or high-speed priority, high speed modulated.
Local setpoint
Two potentiometers, LOW and HIGH, set the speeds on the module corresponding to low and high speed.
External setpoint
The setpoint can also come from the PLC, via the dedicated logic port (inputs ±30 V DC maximum).
Air quality
Via a CO₂ or VOC sensor in the extract duct: airflow increased when pollution rises, reduced in quiet periods.
Variable airflow via a pressure, air quality or temperature sensor.
Technical characteristics
| Function | Conversion of a two-speed asynchronous motor command into EC motor control |
|---|---|
| Wiring reuse | None — existing board and MCR control system retained |
| Unit | One module per air stream |
| Operating logic | Low-speed priority (low speed by default) or high-speed priority (high speed modulated) |
| Controls | Variable airflow via pressure, air quality or temperature sensor |
| Control by air quality | Via a CO₂ or VOC sensor in the extract duct |
| Low/high speed supply input | 400 V AC three-phase without neutral, 50 Hz |
| EC motor supply output | 400 V AC three-phase without neutral, 50 Hz |
| Maximum current | 10 A |
| Fault contact | 0.1 A maximum |
| Protection | Overvoltage and overcurrent, replaceable 0.5 A fuses |
| EC motor logic port | 5-pole terminal block · 24 V DC supply max. 50 mA · 0–10 V control max. 1 mA |
| External PLC logic port | 4-pole terminal block · inputs ±30 V DC maximum |
| Connection cross-sections | Rigid 0.5–2.5 mm² · flexible 0.5–1.5 mm² · stripping 9–10 mm |
| Dimensions | 130 × 130 × 75 mm |
| Mounting | Wall-mounted, with screws (not supplied) |
| Compliance | CE marking · WEEE Directive 2012/19/EU |
| Industrial property | Patented technology |
A solution for every player in the project
HVAC installers & technicians
Offer your customers a fast upgrade: motor replacement, module installation, LOW / HIGH adjustment — with no work on the cabinet and no MCR reprogramming.
Request a quote →Building operators & property managers
Cut the consumption of existing ventilation systems without heavy renovation: the upgrade is done in stages, unit by unit.
Talk to an adviser →Consulting engineers & design offices
Specify a documented solution: connection diagram, full characteristics and Depair technical support in Sierre.
View the documents →Frequently asked questions
Do the distribution board or the MCR control system have to be modified?
No. The module takes the low-speed and high-speed supplies from the existing board exactly as they are. The cabinet, the wiring and the MCR control system stay in place, with no PLC reprogramming.
Which installations is EC-SWAP intended for?
Ventilation systems fitted with a two-speed asynchronous motor (low/high speed) that is being replaced by an EC motor — typically during an air handling unit renovation. One module is needed per air stream.
How is the airflow controlled?
Two logics to choose from at commissioning: low-speed priority or high-speed priority. The speeds are set with the module’s LOW and HIGH potentiometers, by an external PLC setpoint, or from a CO₂ / VOC, pressure or temperature sensor.
Does the installation require a long ventilation shutdown?
The work is limited to replacing the motor and fitting the module as close as possible to the fan. The upgrade can be done in stages, one air stream at a time.
Is EC-SWAP patented?
The technology is patented. The module carries CE marking and complies with WEEE Directive 2012/19/EU.
How do I get a price or check that my installation is compatible?
Contact Depair for an assessment: we confirm compatibility (motor, wiring, controls), select the EC motor and price the supply, with or without commissioning. Online quote request.
Modernise your ventilation with EC-SWAP
Assessment, selection and integration: let’s talk about your motor retrofit project.
Request a quoteContact usOr by telephone: +41 27 455 16 14