T-4100-4 Johnson Controls Thermostat

Overview

The Johnson Controls T-4100-4 is a vertically mounted, single temperature, low volume output pneumatic room thermostat. Designed to provide individual space temperature control in commercial HVAC heating and cooling applications, this reverse-acting instrument modulates controlled devices by producing a proportional output signal in response to load changes. With the use of a remote restrictor, it requires only a single restricted air connection to simplify installation and reduce operational demands on mechanical equipment.

Features

• Reverse-acting operation with low volume output for stable room temperature control.
• Single bimetal sensing element utilizing trusted pneumatic feedback for greater accuracy.
• Integrated standard Fahrenheit and Celsius thermometer for clear local temperature reading.
• Flexible configuration options supporting either exposed or concealed set point adjustment.
• Space-saving, low-profile decorative design engineered specifically for vertical mounting.
• Accessible ball-type force-balance control port allowing convenient test probe access without removing the cover.

Specifications

• Temperature Dial Range: 55 to 85 degrees Fahrenheit (12 to 28 degrees Celsius)
• Supply Pressure: 13 to 25 psig nominal 20 psig restricted
• Sensitivity: Adjustable from 1 to 3 psig per degree Fahrenheit (factory set at approximately 2.5 psig per degree Fahrenheit)
• Air Consumption: 25 SCIM with 0.005 inch restrictor or 45 SCIM with 0.007 inch restrictor
• Air Connections: Barbed fittings designed for 5/32 inch OD polyethylene tubing

Applications

• Proportional space temperature control across various commercial and institutional HVAC environments.
• Modulating control for pneumatic valves, dampers, and related heating and cooling apparatus.
• Energy-efficient load management in multi-zone heating and cooling infrastructure.