Field Controls 46281500 Dehumidistat Control

The Field Controls 46281500 Dehumidistat Control (EDH-1) is a critical component for moisture management in residential foundations and crawl spaces. Engineered specifically for integration with the EL-1 Eliminator Foundation Vent Fan, this 120V OEM controller automates secondary ventilation cycles based on precise relative humidity (RH) thresholds. By actively monitoring ambient moisture levels, the EDH-1 prevents the accumulation of stagnant, humid air that leads to wood rot, mold growth, and compromised structural integrity. This mechanical humidistat can be wired as a standalone controller or in series with a temperature limit switch to ensure the crawl space vent fan only operates under optimal atmospheric conditions.

For high-performance HVAC crawl space moisture control, the EDH-1 supports a parallel load of up to two Eliminator units, allowing contractors to scale ventilation for larger footprints without additional complex circuitry. The adjustable dial allows for field-calibration of the RH setpoint, typically optimized between 45% and 60% depending on local climate demands. This foundation vent control is housed in a robust, site-ready enclosure designed for durability in unconditioned environments. Utilizing an automatic humidity controller like the 46281500 ensures indoor air quality is protected from damp odors and soil gases while maximizing the efficiency of the Eliminator EDH-1 system.

• Precise Humidity Regulation: Automatically activates foundation vent fans when moisture surpasses setpoints to maintain a dry, stable crawl space.
• Dual Unit Capacity: Rated for 120-volt operation and capable of controlling two Field Controls EL-1 units on a single circuit.
• Versatile Wiring: Designed to replace existing temperature switches or work in tandem with them for hybrid temperature/humidity logic.
• Structural Protection: Mitigates long-term moisture damage and fungal growth by promoting consistent cross-ventilation in damp-prone areas.
• Genuine OEM Reliability: Exact Field Controls 46281500 replacement part ensures full compatibility and standard industrial performance.

Can the EDH-1 be used with crawl space fans from other manufacturers?
The EDH-1 is technically designed as an OEM accessory for the Field Controls Eliminator series. While it functions as a standard 120V switch, mounting and electrical compatibility are only guaranteed for the EL-1 Eliminator units.

Is this unit sufficient for a 2,000 square foot crawl space?
The controller can manage the load for two fans, which is typically sufficient for 2,000 square feet (assuming one EL-1 per 1,000 square feet). Always verify local code requirements for total CFM and air changes per hour.

Where is the best location to mount the dehumidistat?
It should be installed in a location that represents the average humidity of the crawl space, away from the immediate discharge or intake of the fans to prevent short-cycling the humidity control system.

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.