The part number A19ACA-15C is a Johnson Controls A19 Series Remote Bulb Temperature Control. It is a mechanical thermostat with a manual reset, SPST switch (open low), a 10-foot capillary, and a 3/8" x 4" sensing bulb. Its setpoint range is -30 to 100°F (-34 to 38°C), making it suitable for refrigeration and general HVAC applications.

Specification & Description of A19ACA-15C

• Manufacturer/Brand: Johnson Controls (PENN Controls series)
• Part Type: Remote Bulb Temperature Control (mechanical thermostat)
• Switch Type: SPST (Single-Pole, Single-Throw), opens on low temperature
• Reset Type: Manual reset (requires operator action to restore after trip)
• Setpoint Range: -30 to 100F 
• Differential: Fixed (factory set, non-adjustable)
• Capillary Length: 10 feet
• Bulb Dimensions: 3/8" diameter x 4" length
• Enclosure: NEMA 1 (general-purpose indoor use)
• Operation:
  • Uses a liquid-filled sensing bulb and capillary to detect temperature.
  • Provides snap-acting mechanical switching when the setpoint is reached.
  • Requires no external power (purely mechanical).