T-4756-202 Johnson Controls Thermostat

Overview

The Johnson Controls T-4756-202 is a pneumatic heating-cooling room thermostat designed to provide individual space temperature control in commercial and institutional HVAC systems. It features a dual-temperature, dual-dial design with high volume output for fast, positive actuation of pneumatic devices like valves and dampers. The thermostat provides automatic changeover between heating and cooling sequences based on changes in supply pressure.

Features

• Dual-dial control for independent heating and cooling setpoints
• High volume output for rapid and responsive actuation of pneumatic devices
• Automatic changeover between direct and reverse actions via supply pressure shifts
• Adjustable sensitivity slider for precise calibration and operation
• Pneumatic feedback mechanism for greater room temperature accuracy
• Vertical mounting design for standard wall installation

Specifications

• Direct Acting Pressure: 15 PSIG
• Reverse Acting Pressure: 20 PSIG
• Switchover Pressure: 17.5 PSIG
• Temperature Setting Range: 55 to 85 degrees Fahrenheit
• Temperature Sensitivity: Adjustable from 0.75 to 4 PSI/F
• Air Consumption: 20 SCIM
• Output Flow Capacity: 400 SCIM
• Ambient Temperature Limits: -20 to 130 degrees Fahrenheit
• Air Connections: Barbed fittings for 5/32 inch O.D. polytubing

Applications

• Commercial office buildings with pneumatic control systems
• Institutional facilities requiring dual heating and cooling thermostat control
• Retrofit and replacement of existing pneumatic thermostats
• HVAC systems requiring high volume pneumatic output for large actuators or valves