Resideo L4081A1023 Aquastat Controller

The Resideo L4081A1023 Aquastat Controller is a professional-grade high and low limit boiler control engineered for hydronic systems requiring integrated dual-function thermal regulation. This SPST immersion-type controller manages both high-limit protection and low-limit circulator/burner cycling within a single, horizontally mounted housing. With a high limit operating range of 130°F to 240°F and a fixed 10°F differential, it ensures precise high-temperature cutout. The low limit side provides a 110°F to 220°F range with an adjustable 10°F to 25°F differential, offering the flexibility needed to maintain minimum boiler temperatures for domestic hot water requirements. Designed for 1-1/2 inch insulation depth, this unit facilitates a clean immersion well installation. It serves as the direct replacement for 410-529-000, ensuring drop-in compatibility for older Weil-McLain and standard hydronic configurations. The aquastat wiring is straightforward for field technicians, maintaining reliable hydronic heating system control even in environments with up to 95% non-condensing relative humidity.

• Dual-Function Regulation: Consolidates high-limit safety and low-limit burner/circulator control into a single dual aquastat component.
• Broad Operating Range: Wide thermal settings accommodate diverse boiler temperature settings for varied climate demands.
• Optimized Compatibility: Verified direct replacement for 410-529-000, reducing diagnostic and installation time during service calls.
• Robust Switching: Features SPST switching logic rated for line voltage applications, ensuring consistent contact closure under load.
• Environmental Resilience: Engineered to operate reliably in high-moisture mechanical rooms with a 0-95% RH rating.

Is the L4081A1023 compatible with vertical mounting?
This specific model is designed and calibrated for horizontal mounting. For vertical applications, an alternative Resideo model should be selected to ensure proper sensor orientation and switch operation.

Does this unit include the immersion well?
The L4081A1023 is typically provided as the controller unit. If the existing immersion well is damaged or sized differently than the 1-1/2 inch insulation depth requirement, a new well must be sourced separately.

What are the electrical ratings for the SPST switches?
The internal switches are rated for standard line voltage (120V AC) and 240V AC applications, making it suitable for direct control of burner circuits and circulator pumps in most residential and light commercial hydronic systems.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.