Volt Free Contacts
Volt-Free Contacts (VFCs) provide a simple method of integrating compatible ATC chillers with external equipment and control systems.
The contacts allow an external system to monitor defined chiller status and alarm conditions without requiring digital communications. This makes VFCs particularly useful where straightforward indication of chiller operation is required as part of a larger machine, process, or control system.
Depending on the chiller model, VFCs can provide external indication of conditions such as:
- Chiller status
- Temperature alarms
- Fluid level alarms
- Flow alarms
This enables an external control system to identify defined operating or alarm conditions and respond as required by the wider application.
The exact contacts and functions available vary by chiller model, so the individual chiller specification and relevant communications documentation should be checked when integrating VFCs into an external system.
Because VFCs provide simple contact-based signalling, they offer a straightforward method of incorporating chiller status into a wider control or monitoring system.
VFCs and RS485 Communications
VFCs and RS485 Communications provide different levels of integration with external systems.
Volt-Free Contacts provide simple status and alarm signals through defined contacts. They do not provide detailed operating data or allow chiller settings to be adjusted.
RS485 provides a digital communications interface, allowing an external system to access supported operating information and control functions.
Both RS485 and VFCs are included as standard on most current ATC units, providing different options for integrating the chiller into external equipment and control systems.
Communication functionality varies by model. Check the individual chiller specification and relevant communications documentation to confirm the interfaces and functions available for your selected unit. For more information, speak to the ATC team.
