T-3311-1 Johnson Controls Thermostat

Overview

The Johnson Controls T-3311-1 is a precision combination pneumatic thermostat and valve actuator designed for proportional control of steam or water valves in heating-cooling applications. This compact, dual-temperature, dual-pressure controller features a remote liquid-filled bulb temperature-sensing element and external setpoint adjustment, providing space control based on return air temperature.

Features

• Combined pneumatic thermostat and valve actuator in a compact unit
• Dual temperature and dual pressure capabilities
• Liquid-filled bulb remote sensor for precise temperature tracking
• External setpoint adjustment with restricted range tabs
• Direct acting at 15 psig and reverse acting at 20 psig for seasonal changeover
• Two built-in restrictors in the switch stack assembly to eliminate external restrictors
• Protected mechanism with a snap-on cover and clear “Cool-Warm” indicator dial

Specifications

• Pressure Range: 15 to 20 psig (105 to 140 kPa) supply pressure; maximum 25 psig
• Temperature Range: 20°F to 150°F (-29°C to 65°C) ambient limits; sensing range 60°F to 150°F
• Sensitivity: 2.5 psi/F° (31 kPa/C°)
• Span: 20F° (11C°) maximum
• Dial Adjustment: Factory set at +7.5°F (+4°C), adjustable down to +2.5°F (+1.4°C)
• Materials: Die-cast aluminum body and yoke with a die-cast zinc cover
• Connections: Straight connector for 1/4 inch O.D. tubing or 1/8 inch NPT barbed fitting
• Weight: 2.62 lbs (1188 g)

Applications

• Designed for use on valve-controlled terminal air conditioning units
• Ideal for proportional control of a steam or water valve in commercial HVAC installations
• Compatible as a replacement for T-3310 series units and updated for compatibility with VG7000 Series valves