Schneider Electric 2216-126 Day-Night Pneumatic Thermostat with Remote 50-85°F

The Schneider Electric (Barber Colman) 2216-126 is a direct acting, day-night pneumatic room thermostat designed for commercial HVAC applications requiring separate temperature control points based on varying occupancy or seasonal loads. This two-pipe pneumatic thermostat is particularly well-suited for day/night temperature control in buildings such as schools, hospitals, office buildings, and other facilities with scheduled occupancy patterns.

Key Features:

• Temperature range: 50-85°F with adjustable setpoints for both day and night operation
• Direct acting pneumatic control with dual bimetal design for accurate temperature sensing
• Day temperature control at main pressure of 15-17 psig, night temperature control at 21-25 psig
• Serrated thumb wheel for easy setpoint adjustment
• Adjustable throttling range from 2-12°F (1-6.7°C) with patented bimetal showing actual range in both °F and °C
• Includes remote sensor capability for local or remote temperature sensing
• Factory-calibrated stainless steel ball-in-seat provides stable, linear pneumatic feedback
• Snap-acting changeover between day and night operation modes
• Separate factory-calibrated night bimetal with fixed 4°F night throttling range
• Leak-proof, self-closing branch gauge tap for system diagnostics

This thermostat operates by switching between two temperature setpoints based on the main air pressure supplied to the unit. Both control points are independently adjustable, and either may be set higher or lower than the other to accommodate heating or cooling applications. The unit utilizes a ball feedback system and works with a 2:1 relay for precise pneumatic control.