Lennox X9953 LZSV 4-Zone HVAC Control Panel Harmony III 24VAC

The Lennox X9953 (LZSV model, formerly known as Harmony III) is a professional-grade HVAC zoning control panel that enables customized climate control for up to four separate temperature zones in residential and commercial applications. This advanced zone control system allows homeowners to set different temperatures for different areas of the home rather than maintaining a single temperature throughout, maximizing both comfort and energy efficiency.

System Capabilities:

• Controls up to 4 independent temperature zones with individual thermostats
• Compatible with multi-stage equipment including 2 heat/2 cool conventional systems
• Supports 3 heat/2 cool heat pump and dual fuel systems
• Operates on 24 VAC power from separate stand-alone transformer
• Automatically controls zone dampers to direct airflow only to zones with active thermostat demand
• Provides individual air volume control for heating or cooling in each zone

What's Included:

• LZSV Zone Control Panel
• Discharge air sensor

Additional Requirements: System requires field-supplied duct-mounted motorized zone dampers and a thermostat for each zone. Professional installation is recommended due to the complexity of HVAC wiring, transformer phasing, and system configuration. This genuine OEM Lennox replacement part ensures reliable performance and maintains published system efficiencies and certifications.