Lennox Y7766 – Lennox LZS1 Zone Control Panel 

 

Lennox Y7766 – Lennox LZS1 Zone Control Panel is a dependable 2-zone HVAC zoning controller designed for residential systems operating on 24 VAC. It provides independent temperature control for up to two separate zones, improving comfort, airflow balance, and overall energy efficiency. The LZS1 panel coordinates thermostats, dampers, and the HVAC equipment to deliver precise climate management without the need for major system upgrades.

This control panel is ideal for homes with two distinct temperature areas, such as upstairs vs downstairs, living vs sleeping areas, or any situation where occupants require different comfort levels. The LZS1 supports standard single-stage heating and cooling systems and works with common electronic 24-volt thermostats.

 

Key specifications

• Supports up to 2 independent HVAC zones
• Operates on 24 VAC
• Works with single-stage heating and cooling systems
• Controls one indoor unit and one outdoor condensing unit
• Requires a separate 24 VAC transformer (panel, dampers, and thermostats must be sized accordingly)
• Compatible with 2- or 3-wire motorized dampers
• Best used with spring-open / power-close dampers
• Intended for use with electronic non-power-robbing thermostats (must have a common wire)

 

Functionality and features

• Automatic opening/closing of zone dampers based on thermostat calls
• Independent temperature control for each zone
• Auto-changeover between heating and cooling modes
• Reduces energy use by conditioning only the active zone
• Improves airflow balance and comfort throughout the home
• Supports multiple dampers per zone (parallel wiring permitted within VA limits)
• Reliable Lennox engineering for long-term operation
• Helps prevent temperature swings between floors or living spaces

 

Typical installation setup

• LZS1 panel installed near the HVAC equipment
• One thermostat per zone
• One or more 24 VAC motorized dampers per zone
• Dedicated 24-volt transformer sized to the number of dampers
• Optional bypass damper if required for static pressure management

Use cases
• Split-level or two-story homes with uneven heating and cooling needs
• Homes where living and sleeping areas require different temperatures
• Reducing energy bills by conditioning only occupied areas
• Adding zoning capability without replacing the HVAC system
• Improving comfort in rooms with large windows or attic exposure

 

Installation notes

• Do not use mechanical or power-robbing thermostats
• Requires proper transformer sizing when multiple dampers are used
• Indoor-only installation; avoid moisture, excessive heat, or mounting on ductwork
• Designed exclusively for 2-zone applications