The Honeywell/Resideo L4006E1091 Aquastat is a trusted high-limit immersion-type controller designed to safeguard hydronic systems—like boilers and storage tanks—by interrupting the circuit when temperatures exceed the 130–270 °F (54–132 °C) range. Featuring a manual-reset mechanism, this SPST (single-pole, single-throw) device breaks the circuit on temperature rise, ensuring that systems don’t exceed safe operating limits.
Features:
- Totally enclosed Micro Switch snap-acting switches operate on temperature rise to setpoint.
- Visible control point scale and external adjustment screw permit easy setting.
- Horizontal or vertical insertion of the sensing element.
- Direct or well immersion of the sensing element.
- Models available for strap-on mounting.
- Remote bulb model may be used to sense air temperature in ducts and in outside air sensing applications.
- Select models include heat-conductive compound.
- Select models have wells.
- UL limit rated device.
