Schneider Electric (Erie) T204 Thermostat

For contractors managing cooling-only applications, the Schneider Electric (Erie) T204 Digital Thermostat provides a reliable, non-programmable solution for 24Vac low voltage HVAC systems. Engineered for direct expansion (DX) cooling and single-stage chilled water systems, this unit integrates a clear LCD display with 1/5th degree resolution. The terminal interface is designed with a separate wall plate, simplifying field wiring for rapid installation and maintenance. The T204 is a power-stealing thermostat that requires a constant 75 mA current; for older systems where current draw is insufficient, we recommend installing the included 250-ohm, 5-watt resistor across the "Y" and "C" or "W" and "C" terminals to ensure electronic stability.

This digital controller features a fixed 2°F cooling differential and a broad setpoint range from 50 to 86°F, making it suitable for standard commercial and residential environmental controls. The front-facing cool/off switch and fan on/auto control provide manual overrides familiar to end-users while maintaining technical precision. To protect equipment, the T204 model includes a jumper-selectable 5-minute time delay to prevent short-cycling of the compressor. The unit’s rigid vinyl housing and off-white finish ensure durability in rugged NEMA Type 1 installations, housing a battery-backed setpoint memory (using Energizer 357 or equivalent) to retain settings during total power loss.

• Precise 24Vac Digital Control: Optimized for cooling-only DX systems and fan coil units requiring 20 to 32 Vac input.
• Simplified Installation: Features a separate terminal wall plate and includes an adapter plate for covering existing mounting blemishes.
• Compressor Protection: Integrated anti-short cycle delay is easily configured via internal jumpers to extend equipment life.
• Technical Reliability: Maintains a 75 mA minimum power draw for consistent LCD thermostat performance and logic stability.
• Field Versatility: Supports manual fan control and offers optional mechanical low-limit freeze protection for specific facility requirements.

• What are the wiring requirements for the T204? This unit is a three-wire thermostat application typically requiring R, Y, and G leads; however, it must maintain a 75 mA draw. If your cooling relay does not provide this minimum current, use the provided resistor in parallel with the load.
• Can this be used for heat pump applications? The T204 is a cool-only thermostat. For heat/cool or heat pump systems with manual changeover, the T205 or T207 models from the Erie T200 series should be utilized.
• Is a common wire required? No, this is a power-stealing design, but the load must be present to complete the circuit for the electronics to function.

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.