Description
Johnson Controls A19ADB-38 Remote Bulb Temperature Control Overview
The Johnson Controls A19ADB-38 is a mechanical remote bulb temperature control engineered for reliable, precise temperature switching across a broad range of HVAC and commercial applications. With a wide operating voltage range and a generous setpoint span, this control is a versatile solution for high-temperature limit protection and process temperature management.
Key Features
- Wide voltage compatibility: 24 to 277Vac for flexible integration into diverse electrical systems
- SPST (Single-Pole, Single-Throw) switching action for straightforward open/close circuit control
- Open High action — contacts open on temperature rise, ideal for high-limit safety applications
- Manual Reset required after trip, ensuring a deliberate restart following a high-temperature event
- Setpoint range of 100°F to 240°F to cover a wide variety of heating and process control scenarios
- 6-foot capillary length provides installation flexibility, allowing the sensing bulb to be remotely located from the control body
- 3/8″ x 4″ sensing bulb for accurate, responsive temperature detection
- Screwdriver slot range adjuster for convenient, tool-accessible setpoint calibration
- Mechanical operation — no external power required for sensing, enhancing reliability
Specifications
- Brand: Johnson Controls
- SKU / Model: A19ADB-38
- Control Type: Mechanical Remote Bulb Temperature Control
- Voltage Range: 24 to 277Vac
- Switch Type: SPST
- Action: Open High (contacts open on temperature rise)
- Reset Type: Manual Reset
- Setpoint Range: 100°F to 240°F
- Capillary Length: 6 feet
- Sensing Bulb Size: 3/8″ diameter x 4″ length
- Range Adjuster: Screwdriver Slot
Applications
The A19ADB-38 is well-suited for high-limit temperature control in commercial HVAC equipment, unit heaters, duct heating systems, boiler applications, and industrial process control where a manual reset safety interlock is required. The Open High / Manual Reset configuration makes it an excellent choice wherever an automatic restart after a temperature fault would be unsafe or undesirable.
Why Choose the Johnson Controls A19ADB-38?
Johnson Controls has a long-standing reputation for quality and reliability in building controls and HVAC components. The A19ADB-38 combines a robust mechanical design with broad electrical compatibility and a field-adjustable setpoint, making it a dependable choice for contractors, engineers, and facility managers who demand consistent performance in demanding environments.
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