T26S-18C Johnson Controls Thermostat

Overview

The Johnson Controls T26S-18C is a high-quality line voltage wall thermostat designed for heavy- or light-duty applications. It provides single-pole double-throw (SPDT) control for heating, cooling, or year-round air conditioning systems. The unit features a thermoplastic cover with an Allen-head locking screw to discourage unauthorized tampering, alongside a liquid-filled sensing element that responds quickly and accurately to surrounding air temperature changes without requiring anticipators.

Features

• Heavy-duty SPDT switch configuration suitable for heating, cooling, or year-round control.
• Enclosed Pennswitch mechanism that provides dust protection for electrical contacts.
• Liquid-filled sensing element paired with a highly efficient diaphragm and lever mechanism for excellent sensitivity.
• Tamper-resistant thermoplastic cover with an Allen-head locking screw.
• Field-installable vertical or horizontal faceplates with an adjustable knob interface.
• Built-in adjustable high and low range dial stops for energy conservation.
• Integral bimetal thermometer for local temperature display.
• Mounting plate design that allows for easy installation and wiring without removing the cover.

Specifications

• Temperature Setpoint Range: 40 to 90 degrees F (5 to 30 degrees C)
• Thermometer Range: 50 to 90 degrees F (10 to 30 degrees C)
• Operating Differential: Approximately 1.75 degrees C for heating, 2.25 degrees C for cooling
• Ambient Operating Temperature: 0 to 105 degrees F
• Supply Voltage (Nominal): 120 VAC, 208 VAC, 240 VAC, or 277 VAC
• Control Output: SPDT Relay (10 Amps at line voltage)
• Electrical Connections: Large 8-32 x 1/4 inch binder head screws
• Mounting: Standard single- or double-gang switch box (2 x 4 inch wall box)
• Dimensions: 4.71 x 2.96 x 2.87 inches
• Shipping Weight: Approximately 1.30 lbs to 3.00 lbs depending on configuration packaging

Applications

• Commercial, industrial, and residential heating and cooling control.
• Line-voltage or low-voltage control of unit heaters, fan coils, and blast coils.
• Electric heat applications, duct furnaces, and greenhouse climate systems.
• Year-round ventilation and air conditioning systems requiring reliable standalone mechanical switching.