Schneider Electric 2218-132 Summer-Winter Pneumatic Thermostat

The Schneider Electric (Barber Colman) 2218-132 is a pneumatic summer-winter thermostat designed for proportional control of pneumatic valves and damper actuators in commercial HVAC systems. This dual-action thermostat automatically switches between heating and cooling modes based on main air pressure, eliminating the need for manual seasonal changeover.

Key Specifications:

• Reverse acting at 16 psig (summer mode)
• Direct acting at 25 psig (winter mode)
• Setpoint range: 55°F to 85°F (13°C to 29°C)
• Adjustable throttling range: 2°F to 12°F (1°C to 7°C)
• Branch line pressure: 12 psig
• Air consumption: 31.1 scim at 16 psig, 43.2 scim at 25 psig

Design Features:

• Highly sensitive bimetal thermostatic element for precise temperature control
• Pilot-operated relay with pneumatic feedback for accuracy and stability
• Factory-calibrated stainless steel ball-in-seat design
• Snap-acting changeover between direct and reverse action modes
• Serrated thumb wheel for easy setpoint adjustment
• Leak-proof, self-closing branch gauge tap

Included Components:

• (2) 1/4" x 3/16" barbed couplings
• 20-693 tubing
• Standard mounting plate (20-711)
• Wall plate (20-714)
• Mounting screws
• Universal cover (no decorator plate)

The 2218-132 replaces legacy model T32-301 and is ideal for environmental control systems utilizing dual-pressure air mains for automatic seasonal changeover. Seasonal switching is accomplished remotely by changing the main air supply pressure, making it perfect for large commercial buildings with centralized HVAC control.