Description
Johnson Controls A19ADC-31 Utility Thermostat Overview
The Johnson Controls A19ADC-31 is a heavy-duty utility thermostat engineered for reliable high-temperature sensing and control in commercial and industrial HVAC applications. Featuring a remote bulb sensing element connected via a 6-foot capillary tube, this thermostat accurately monitors temperatures at a distance from the control body, making it ideal for duct, pipe, or equipment-mounted sensing. The manual reset function ensures that the thermostat requires deliberate operator intervention before resuming normal operation after a high-limit trip — a critical safety feature in process and HVAC environments.
Key Features
- Wide temperature range: 100°F to 240°F for high-limit and process control applications
- Multi-voltage compatibility: operates on 120, 208, or 240 Vac for flexible installation
- 6-foot capillary length for remote bulb placement away from the control body
- SPDT (Single-Pole, Double-Throw) Open on Rise switching action for versatile circuit control
- Manual reset design — requires deliberate reset after high-limit trip for added safety
- Enclosed setpoint adjustment for tamper-resistant, secure temperature setting
- Remote bulb sensing element for accurate temperature measurement at the source
Specifications
- Brand: Johnson Controls
- Model / SKU: A19ADC-31
- Voltage: 120 / 208 / 240 Vac
- Temperature Range: 100°F – 240°F
- Capillary Length: 6 feet
- Switch Type: SPDT (Single-Pole, Double-Throw)
- Switching Action: Open on Temperature Rise (High Limit)
- Reset Type: Manual Reset
- Setpoint Adjustment: Enclosed (tamper-resistant)
- Sensing Element: Remote Bulb
Applications
- High-limit temperature control in commercial HVAC systems
- Industrial process temperature monitoring and safety shutoff
- Duct and air handler high-temperature protection
- Boiler and heating equipment safety control
- Remote sensing applications where the control body must be mounted away from the sensing point
Why Choose the Johnson Controls A19ADC-31?
Johnson Controls A19 Series thermostats are trusted throughout the HVAC and building automation industry for their durability, accuracy, and ease of installation. The A19ADC-31 combines a broad 100–240°F sensing range with multi-voltage flexibility and a safety-focused manual reset mechanism, making it an ideal choice for applications where unintended restarts must be prevented. The enclosed setpoint adjustment adds an extra layer of security, ensuring settings remain consistent in field environments.
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