T-4516-201 Johnson Controls Thermostat

Overview

The Johnson Controls T-4516-201 is a high-performance, dual-temperature pneumatic room thermostat designed to provide individual day control and night or weekend setback in commercial heating and cooling applications. It features a direct-acting control action, horizontal mounting orientation, and high-volume proportional output to efficiently modulate controlled devices in response to space load changes. It includes a manual indexing switch to temporarily restore day control during the night cycle and an additional switchline output for automated equipment management.

Features

• Dual-temperature control with two independent dials for individual day and night setpoint management
• High volume proportional output with a 400 SCIM flow capacity for fast, responsive pneumatic actuation
• Manual indexing pushbutton switch to restore day operation locally without affecting other system thermostats
• Integrated switchline output to automatically turn auxiliary equipment like fans on or off during unoccupied cycles
• Adjustable sensitivity slider to easily optimize instrument operation based on specific space requirements

Specifications

• Control Action: Direct Acting
• Mounting Orientation: Horizontal
• Flow Capacity: 400 SCIM
• Air Consumption: 20 SCIM
• Supply Pressure Range: 13 to 25 Psig (Nominal 15 Psig for lower dial, 20 Psig for upper dial)
• Temperature Dial Range: 55°F to 85°F
• Air Connections: Barbed fittings for 5/32 in. O.D. polytubing (3 pipes: Supply, Output, Switchline)
• Sensitivity: Adjustable from 0.75 to 4.0 psig/°F (Factory set at 2.5 psig/°F)
• Switchover Pressure: Factory set at 17.5 PSIG

Applications

The T-4516-201 is ideal for commercial and institutional HVAC systems utilizing pneumatic controls. It is widely used in variable air volume (VAV) systems, dual-duct systems, fan-coil units, and other air-handling applications that require precise, high-volume pneumatic output combined with dual-temperature setpoint capabilities.