The Johnson Controls A19ZBC-2 is a robust mechanical temperature control engineered for demanding refrigeration and HVAC applications where reliable defrost duration and fan delay management are critical. Featuring a wide voltage compatibility range of 24 to 277VAC, this SPDT (Single-Pole, Double-Throw) controller integrates seamlessly into a broad variety of commercial and light-industrial systems without the need for additional transformers or voltage conversion.
Defrost Duration & Fan Delay Control
Designed specifically to manage defrost cycles and fan delay sequences, the A19ZBC-2 helps protect evaporator coils and extend equipment life. Its automatic reset function ensures the system returns to normal operation without manual intervention once the setpoint condition is satisfied — reducing service calls and improving system uptime.
Precision Sensing with 6′ Capillary Bulb
The unit ships complete with a 6-foot capillary tube and a 19/64″ x 3-1/8″ sensing bulb, allowing flexible placement in tight or remote sensing locations. The knob range adjuster provides straightforward, tool-accessible setpoint calibration across the full 45°F to 85°F operating range.
Key Specifications
- Brand: Johnson Controls
- Model / SKU: A19ZBC-2
- Control Type: Mechanical Temperature Control
- Voltage Range: 24 to 277VAC
- Switch Action: SPDT (Single-Pole, Double-Throw)
- Reset Type: Automatic Reset
- Setpoint Range: 45°F to 85°F
- Capillary Length: 6 feet
- Sensing Bulb Dimensions: 19/64″ x 3-1/8″
- Functions: Defrost Duration Control & Fan Delay Control
- Setpoint Adjustment: Knob Range Adjuster
Applications
- Commercial refrigeration defrost cycle management
- Evaporator fan delay sequencing
- Walk-in cooler and freezer temperature control
- Light commercial HVAC systems requiring wide-voltage compatibility
- OEM equipment requiring mechanical thermostat control
Why Choose the Johnson Controls A19ZBC-2?
Johnson Controls A-Series temperature controls are trusted by HVAC/R technicians and OEM manufacturers worldwide for their durability, accuracy, and ease of installation. The A19ZBC-2’s wide voltage range eliminates compatibility concerns across diverse equipment platforms, while the automatic reset and integrated defrost/fan delay functions reduce system complexity and wiring requirements.
