Maxitrol TD120 Temperature Selector

The Maxitrol TD120 is a precision-engineered space temperature selector designed for integration with Selectra Series 20 and 30 electronic gas flame modulation systems. Built for heat-only applications in commercial and industrial environments, this remote selector allows for accurate setpoint management across a 60-85 degrees F range. It serves as a superior alternative to traditional mechanical controls, providing stable and consistent command over gas flow when paired with Maxitrol modulator-regulator valves. By superseding the legacy TD107A model, the TD120 ensures modern compatibility and improved efficiency for managing indirect-fired units with atmospheric burners.

For a complete Selectra modulation system, the TD120 must be utilized in conjunction with a matching TS120 remote temperature sensor and a Series 20 amplifier for single furnace operation, or a Series 30 amplifier for multi-furnace configurations (up to four units). The selector is typically mounted within a control cabinet or at a convenient operator station, separate from the actual sensing location. This configuration allows field technicians to fine-tune the heating furnace output from a centralized point while the remote sensor monitors the actual floor conditions, eliminating the temperature swings common in non-modulating systems.

• Precise Modulation Control: Interfaces with Maxitrol amplifiers to provide instantaneous gas flow adjustments rather than inefficient on/off cycling.
• Optimized Temperature Range: Dedicated 60 to 85°F adjustment range tailored for standard commercial occupied spaces.
• Enhanced System Matching: Direct replacement for the Maxitrol TD107A, ensuring seamless retrofitting in existing HVACR systems.
• Industrial Durability: Rugged construction designed to withstand ambient limits from -30°F to 125°F.
• Centralized Management: Enables remote setpoint adjustment away from the intake or discharge air stream for better accessibility.

Is the Maxitrol TD120 compatible with my current T120 Selectrastat?
The TD120 is a remote selector only. While the T120 Selectrastat features an integral sensor, the TD120 requires a separate TS120 remote sensor to function. They are part of the same series but fulfill different installation architectures.

Can I use this selector for cooling or make-up air applications?
No, the TD120 is strictly engineered for heat-only space heating. For make-up air or discharge air control, a Series 14 or Series 21 system component would be required.

What wiring is required for the TD120 installation?
Technicians should use 105°C rated wiring and ensure that control lines are not run inside the same conduit as power or ignition wires to prevent electrical interference with the modulating signal.

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.