T-4752-206 Johnson Controls Thermostat

Overview

The Johnson Controls T-4752-206 is a pneumatic heating-cooling room thermostat engineered for reliable dual-mode temperature control in commercial and industrial HVAC systems. Designed for vertical mounting with a single dial, it provides automatic changeover between heating and cooling states based on system supply pressure variations.

Features

• Dual-temperature control accommodating both heating and cooling modes in a single instrument.
• Automatic pressure-proportional changeover depending on the incoming supply signal.
• High volume output capacity ensuring rapid control response.
• Clear Fahrenheit set point dial for straightforward local configuration.
• Adjustable sensitivity via an internal slider mechanism to match varying space dynamics.

Specifications

• Mounting Orientation: Vertical wall mounting.
• Reverse Acting Supply Pressure (Heating): 15 psig (105 kPa) nominal.
• Direct Acting Supply Pressure (Cooling): 20 psig (140 kPa) nominal.
• Factory Calibration Switchover Point: 17.5 psig (122 kPa).
• Air Consumption: 20 scim (5.5 mL/s).
• Output Flow Capacity: 400 scim (109 mL/s).
• Sensitivity Adjustment Range: 0.75 to 4.0 psi/F° (9 to 50 kPa/C°), factory preset at 2.5 psi/F°.

Applications

• Commercial and industrial building automation networks requiring pneumatic space temperature management.
• Integration with variable air volume (VAV) systems, terminal reheat units, and fan coil systems.
• Multi-season thermal zoning where centralized control over manual switchover is preferred via system pressure scheduling.