A19ZBC-2C Johnson Controls Temperature Control

Overview

The Johnson Controls A19ZBC-2C is a single-stage, remote bulb electromechanical temperature control designed for defrost duration and fan delay applications. Part of the Penn A19 Series, this device features a liquid-filled sensing element and capillary to provide reliable temperature regulation independent of barometric pressure or cross-ambient temperature changes. It includes an adjustable defrost termination setting and a preset fan delay temperature to optimize HVAC and refrigeration systems.

Features

• Liquid-filled sensing element remains unaffected by barometric pressure and cross-ambient temperature variations.
• Single-pole, double-throw (SPDT) enclosed snap-acting Pennswitch mechanism allows for versatile heating or cooling control.
• Features an adjustable front-control setpoint dial with a convenient knob for setup.
• Designed with a durable, zinc-plated cold-rolled steel case and a black powder-coated galvanized steel cover.
• Standard 6-foot capillary offers flexible remote sensing placement.

Specifications

• Temperature Range: 45°F to 85°F (7°C to 29°C) defrost termination range
• Temperature Differential: 20°F to 60°F adjustable differential higher than the fan delay setting
• Fan Delay Setting: Factory preset at 25°F (-4°C), adjustable ±5°F with the included tool
• Maximum Bulb Temperature: 140°F (60°C)
• Sensing Bulb Dimensions: 19/64 inch x 3-1/8 inches
• Capillary Length: 6 feet (1.8 m)
• Enclosure Rating: NEMA 1
• Electrical Ratings: 16.0 A full load at 120 VAC, 8.0 A full load at 240 VAC; Pilot duty rated for 125 VA at 24 to 277 VAC

Applications

• Used primarily as a defrost termination and fan delay control for commercial refrigerated display cases.
• Suitable for general-purpose remote bulb temperature control in commercial HVAC and refrigeration systems.