Fan Coil Units

R-TIO Optional IO

R/TIO modules provide a compact input/output solution for Ontrol’s R-ION series programmable touch-screen room controllers.

This combination greatly simplifes installation on the wall-unit side, as the IO module can be located close to the terminal unit being controlled, with only comms wiring into the wall unit.


2 triac outputs | 4 analog outputs | 5 relay outputs


Share this product:


The mains powered versions eliminate the need for additional power-supplies or transformers further reducing cost and installation labor. R/TIO also hosts a battery backed-up real-time-clock. Therefore, time schedules can be implemented directly on the device, fully configurable locally from the connected R-ION or remotely from a supervisory system. R/TIO input/output modules are not independently communicating devices.

They can only be used with the Ontrol’s R-ION touch screen controllers. However, a modbus communicating version (M/TIO) is also available for use on other systems.

Inputs and Outputs

Relay Outputs: 5 relay outputs are provided. Each relay can be used independently, and a specific set of three can be configured for 3-speed fan control.

Triac Outputs: 2 triac outputs are provided with flexible configuration options, allowing control of on/off thermoelectric (PWM) or floating actuators or relays. The triacs can be independently configured to control different loads. However, due to internal connections, all loads must be supplied from the same AC voltage. Floating (three-position) configuration requires use of both triacs.

Modulating Outputs: Four 0-10VDC analog outputs are provided for controlling modulating valve or damper actuators. Two of these can be configured to function as digital inputs.

Expansion port: Up to two RK4 modules can be connected to the device with a ribbon cable, providing a total of 8 additional relay outputs.

Real time clock: 4 time-schedules can each be independently associated with a relay output through configuration parameters. Each schedule allows 28 sets of start/stop times per day of the week.

Popular Products

Better manage your HVAC with our stock of programmable Fan Coil Units supporting a range of communications, including BACnet, Modbus and Modbus MSTP.