Johnson Controls A19AAF-12C Remote Bulb Temperature Control

Remote Bulb Temperature Control from Johnson Controls, model A19AAF-12C, delivers precise sensing for HVAC/R and water heating systems. The compact design uses a Type 3/8 inch x 3 inch bulb with a 10-foot capillary and fixed differential to maintain stable temperatures across demanding environments.

Operating over a broad temperature range, it switches reliably from 25 to 225°F, with a maximum temperature rating of 275°F. The unit features SPDT contacts for versatile wiring, rated 24 to 277 VAC at up to 10 A, making it a robust choice for commercial and residential controls.

Ideal for HVAC/R control and water heating, the A19AAF-12C includes a convenient range adjuster with a screwdriver slot to fine-tune response without removal, ensuring accurate setpoints and smooth operation in tight installations.

• Bulb and capillary: Type 3/8" x 3" bulb with a 10-foot capillary and fixed differential.
• Temperature range: 25 to 225°F operating range; 275°F maximum rating.
• Electrical: SPDT contact, 24–277 VAC, up to 10 A.
• Applications: HVAC/R and water heating control.
• Adjustment: Screwdriver-slot range adjuster for precise setpoints.