Aprilaire 8024 24V Universal SPDT Isolation Relay Card

Dry-Contact Relay Card for Integrating Dehumidifiers with Automation Systems

A dehumidifier's onboard controls work fine on their own, but most commercial grow facilities want that equipment reporting into a central building automation or grow-room control system instead of running in isolation. The Aprilaire 8024 relay card provides the dry-contact switching layer that makes that integration possible.

The card carries three independent SPDT (single-pole, double-throw) relays sharing a single 24V coil, giving an automation system three separate dry-contact switching points from one input signal. That's enough to wire multiple functions — start/stop, alarm status, or setpoint override — into a single facility control platform.

Key Features & Benefits

• Three Independent SPDT Relays — Provides three separate dry-contact switching points from a single card.
• Shared 24V Coil — One coil drives all three relays, simplifying wiring versus separate relay modules.
• Dry-Contact Switching — Isolates the automation system's control signal from the equipment's own electrical circuit.
• Building Automation Compatible — Built to integrate dehumidifiers and environmental controls with grow room and building automation systems.
• General-Purpose Design — Not limited to a single equipment type, so it fits a range of dry-contact integration needs.

Who Should Use This Relay Card

This card is for facilities running a central building automation or grow-room control system that needs to monitor or switch dehumidifiers and other environmental control equipment as part of that system. It's not necessary for a standalone dehumidifier running on its own onboard control with no automation tie-in.

About Aprilaire and Dry-Contact Isolation Relays

Aprilaire (Research Products Corporation) manufactures HVAC control components, including the isolation relay cards used across a range of commercial and residential control integrations. Anden stocks the 8024 as a compatible accessory in its environmental control catalog for growers who need a dry-contact bridge between dehumidification equipment and a facility's broader automation system.

Frequently Asked Questions

What does a dry-contact relay do?

A dry-contact relay switches a separate circuit without passing electrical current between the two sides, isolating a control signal from the equipment's own power circuit. That isolation protects both the automation system and the equipment from electrical interference or damage.

How many relays are on the 8024?

The 8024 carries three independent SPDT relays that share a single 24V coil. That gives you three separate switching points from one card rather than needing three separate relay modules.

Is this relay card specific to Anden dehumidifiers?

No, the 8024 is a general-purpose dry-contact switching device. Anden stocks it as a compatible accessory for integrating its dehumidifiers with automation systems, but it isn't built exclusively for one equipment brand.

Do I need this card for a standalone dehumidifier?

No, a dehumidifier running on its own onboard control without a connection to a building automation or grow-room control system doesn't need this card. It's specifically for facilities integrating equipment into a central control platform.

What voltage does the relay card use?

The 8024 runs on a 24-volt coil, a standard low-voltage control circuit voltage used widely across HVAC and building automation equipment. That makes it compatible with most standard automation control wiring.