HVAC Control

The Aprilaire 8024 24V Universal SPDT Isolation Relay Card is a three-relay, dry-contact module designed for precise HVAC and humidity management in controlled environments. Each SPDT relay switches independently (shared common coil), making it easy to integrate fans, mode selection, and temperature control into one reliable panel.

Reliable Dry-Contact Switching & Universal Integration

With a 24V power supply and isolation function, this relay card cleanly interfaces with existing controllers, environmental monitors, and humidifiers/dehumidifiers—reducing electrical noise and cross-talk.

How It Helps Growers

Use it to automate heating/cooling mode selection, regulate fan operation for airflow and VPD support, and coordinate centralized control across multiple devices. The universal compatibility ensures quick installs, consistent response, and safer low-voltage switching—ideal for scaling environmental control.

Composition/Specs:

• 24V coil.
• Three SPDT relays.
• Dry contacts.
• Isolation function.
• Universal integration.

Uses:

• Mode selection (heat/cool).
• Fan control.
• Synchronized HVAC/humidity systems.
• Temperature-based source switching.
  
  

Key Features:

• Independent 3-relay SPDT switching for flexible device control

• Clean, isolated 24V dry contacts reduce interference and protect upstream controllers

• Universal compatibility for quick integration with HVAC and environmental systems

• Precise mode and fan control to support airflow, temperature, and VPD targets

• Scalable panel-friendly form factor for multi-zone automation