HVAC Relays
Types of HVAC Relays
HVAC relays provide switching and control functions in HVAC equipment and building systems. They are commonly used for control logic, equipment staging, and interfacing between controllers and loads.
- Relays used to switch loads based on controller outputs.
- Relays selected for equipment staging and control circuits.
- Relays used for service replacement in existing HVAC equipment.
For upstream control components, see Controllers. For monitoring inputs used in control logic, see HVAC Sensors.
Key Selection Criteria for HVAC Relays
- Coil voltage compatibility with the control circuit.
- Contact configuration and contact rating requirements for the load.
- Mounting style and socket/base requirements where applicable.
- Environment and duty cycle considerations.
- Replacement compatibility with existing equipment.
Matching coil voltage and contact ratings is the fastest way to ensure correct relay selection.
Frequently Asked Questions
What are HVAC relays used for?
They are used to switch loads and support control logic in HVAC equipment and building control circuits.
What should I confirm for coil voltage and contact rating?
Confirm coil voltage matches the control circuit and that contact ratings/configuration match the load being switched.
How do I choose relays for replacement vs new builds?
For replacement, match the existing relay's coil voltage, contact configuration, and mounting style. For new builds, select relays based on control voltage, load requirements, and panel standards.