International Environmental 71491054 Thermostat

The International Environmental 71491054 Thermostat is a high-precision, horizontal-mount control designed for vertical and horizontal fan coil units. As a direct replacement for the 70289334 thermostat, this unit provides automatic changeover (Auto CO) functionality, allowing the system to switch between heating and cooling modes independently based on the 50-90°F setpoint. Built for versatility in commercial HVAC applications, it supports a wide voltage range of 24V to 277V, making it compatible with both low-voltage control circuits and high-voltage line systems without the need for additional transformers.

Engineered for technical reliability, the 71491054 features a manual and automatic changeover interface that ensures consistent climate regulation in multi-story buildings and hotel environments. The horizontal thermostat design allows for low-profile mounting, while the rugged internal switching components are rated for long-term fan coil unit (FCU) operation. For contractors performing a retrofit, this IEC replacement thermostat simplifies the service process by matching the footprint and wiring requirements of legacy International Environmental Corporation (IEC) controls.

• Universal Voltage Compatibility: Operates on any system from 24V to 277V, reducing the need to carry multiple thermostat types on the truck.
• Auto Changeover Logic: Internal Auto CO functionality eliminates manual seasonal switching, improving occupant comfort and system efficiency.
• Drop-In Replacement: Specifically validated as the replacement for the legacy 70289334 model, ensuring terminal compatibility.
• Precision Temperature Range: Maintains a tight 50-90°F operating window suitable for standard 2-pipe and 4-pipe configurations.

Is the 71491054 compatible with 277V line voltage systems?
Yes, this unit is rated for 24-277V AC, making it suitable for high-voltage fan coil applications common in older commercial high-rises.

Does this thermostat support multiple fan speeds?
This specific model is designed to interface with the IEC fan coil control boards; always verify your specific wiring diagram for 3-speed vs. single-speed fan integration.

What does 'Auto CO' mean for my installation?
It stands for Automatic Changeover, meaning the thermostat will engage either heating or cooling relays automatically to maintain the selected temperature without user intervention.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.