T-3111-1 Johnson Controls Thermostat

Overview

The Johnson Controls T-3111-1 is a combination pneumatic thermostat and piston top valve actuator designed for single-temperature HVAC applications. It provides proportional, direct-acting control of steam or water valves in terminal air conditioning units and commercial building automation systems. It functions as a direct replacement for the legacy T-3110 series and is fully compatible with VG7000 Series valves.

Features

• Direct-acting control action that increases output pressure as temperature rises
• Remote liquid-filled bulb sensing element with a 42-inch capillary for precise return air sensing
• External setpoint adjustment dial allowing rapid field calibration in 1-degree Fahrenheit increments
• Compact valve-top mounting design that eliminates separate brackets or linkages
• Built-in internal restrictor in the supply air tee to simplify installation piping
• Durable die-cast aluminum construction with a resilient molded rubber diaphragm

Specifications

• Control Range: 60 to 150 degrees Fahrenheit
• Supply Air Pressure: Up to 25 psig maximum
• Air Consumption: 1.5 SCIM
• Sensitivity: 2.5 psi per degree Fahrenheit
• Connections: 1/4-inch barbed supply tee, 1/8-inch NPT subordinate
• Valve Compatibility: Fits 1/2-inch to 2-inch NPT normally open, normally closed, or mixing valves

Applications

• Terminal air conditioning units requiring integrated valve control
• Commercial HVAC systems utilizing pneumatic automation circuits
• Fan coil units, air handlers, and hydronic heating or cooling loops