A28AA-36C Johnson Controls Temperature Control

Overview

The Johnson Controls A28AA-36C is a line-voltage, two-stage mechanical temperature control designed to incorporate a liquid-filled sensing element for reliable climate control. It features an adjustable interstage differential, enabling stable and precise temperature regulation for heating and cooling systems. Housed in a compact NEMA 1 enclosure, this controller is engineered to operate independently of alterations in barometric pressure and cross ambient conditions.

Features

• Liquid-Filled Sensing Element: Ensures precise, rapid, and repeatable response to temperature variations.
• Stable Performance: Unaffected by barometric pressure changes or cross ambient temperature conditions.
• Robust Dual Switches: Equipped with two SPDT snap-acting switches for multi-stage control configurations.
• Durable Enclosure: Built with a compact NEMA 1 rated housing for secure surface mounting.

Specifications

• Temperature Range: 40°F to 90°F (4.5°C to 32.2°C)
• Switch Type: 2-SPDT (Single-Pole, Double-Throw)
• Switch Action: Open or close on rise
• Contact Rating: 1 HP @ 120/240 VAC; 16 Full Load Amps @ 120 VAC, 9.2 Full Load Amps @ 240 VAC
• Differential: 3°F fixed stage differential; 2°F to 7°F adjustable interstage differential
• Capillary Length: 6 feet (72 inches)
• Bulb Dimensions: 3/8 inch diameter x 5-3/4 inches length

Applications

The A28AA-36C is widely utilized in commercial HVAC, industrial automation, and agricultural ventilation systems where accurate two-stage temperature monitoring is required. Common applications include managing central heating systems, air conditioning networks, refrigeration equipment control, and general environmental conditioning units that require specialized staging setup.