Maxitrol T120 Stat

The Maxitrol T120 Selectrastat is a high-precision, wall-mounted indirect fired heating control designed for commercial and light industrial space heating applications. Engineered for seamless integration with Maxitrol Series 20 and Series 30 systems, this thermostat provides both integral temperature sensing and manual setpoint adjustment within a 60-85°F range. When paired with an A1010 or A1011 amplifier and an MR Series modulating valve, the T120 maintains tight discharge air control by adjusting the gas flame in response to minute temperature changes. This electronic gas flame modulation ensures optimal efficiency for atmospheric burners, whether configured for a single furnace (Series 20) or a multi-furnace manifold (Series 30) involving up to four units. Its solid-state design eliminates the hunting common in traditional on/off cycles, making it an essential component for HVAC contractors servicing duct furnaces or make-up air units. The T120 supersedes older T107A-1 models, offering a reliable field replacement that remains compatible with all standard fuel gases, including natural gas and LP mixtures.

• Precise Modulation: Facilitates electronic flame modulation to prevent temperature swings and improve fuel economy.
• System Versatility: Fully compatible with Selectra Series 20/30 for space heating and Series 21/31 for specialized air sensing applications.
• Contractor Friendly: Simplified 24V AC wiring with clear terminal designations for rapid field installation or replacement of legacy Selectrastats.
• Robust Compatibility: Designed to drive MR410, MR510, and MR610 series modulator-regulator valves across various pipe sizes.

What is the difference between the T120 and a standard thermostat?
The T120 is a Selectrastat, meaning it does not just turn a furnace on or off; it sends a variable signal to a Maxitrol amplifier to modulate the gas valve's output for constant temperature maintenance.

Can this be used for multiple furnaces?
Yes, when used with a Series 30 or 31 amplifier (such as the A1011), a single T120 can control up to four furnaces on a single system.

Does it require a specific power supply?
The unit operates on 24V AC. For single furnace systems, a 40VA transformer is sufficient, while multiple furnace setups typically require a 100VA capacity.

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.