Lennox 24Z17 Thermostat
The Lennox 24Z17 ComfortSense 3000 is an industrial-grade programmable thermostat engineered for precise climate control in both residential and light commercial HVAC applications. As the direct replacement for Lennox 51M37, this L3532U model is a universal solution capable of managing up to 3 heat / 2 cool stages. Designed for high-reliability environments, it features 5-2 day programming, allowing contractors to customize separate schedules for weekdays and weekends with four distinct time periods per day. The unit is hard-wired to the indoor power supply, eliminating the need for batteries and reducing nuisance service calls. Its large, back-lit LCD provides clear system status icons and accurate digital temperature readings, significantly outperforming legacy mechanical controls. For dual-fuel or heat pump installations, the Lennox 24Z17 supports auxiliary heat lockout and is compatible with an optional outdoor temperature sensor to maximize energy-efficient HVAC control and equipment longevity.
Key Benefits for Professionals- Universal Compatibility: Operates seamlessly with conventional gas/oil/electric systems, heat pumps, and dual-fuel configurations.
- Direct OEM Replacement: Replaces discontinued Lennox 51M37 and L3532H models without requiring wiring modifications.
- Advanced Protection: Integrated five-minute compressor short-cycle protection and overheat safety switches (opening at 93°F) safeguard the condenser and furnace.
- Contractor-Friendly Maintenance: Built-in filter monitor and service alerts keep end-users informed of routine maintenance needs, reducing emergency repairs.
- Non-Volatile Memory: Maintains all programmed schedules for up to 24 hours during total power outages.
Is the Lennox 24Z17 compatible with my existing heat pump?
Yes, the Lennox 24Z17 is a universal multi-stage thermostat designed to control up to 3 heating and 2 cooling stages, making it an ideal fit for most standard and high-efficiency heat pump systems.
Does this unit require batteries for operation?
No, this model is hard-wired directly to the 24VAC indoor unit power supply, ensuring consistent operation without the failure points associated with battery-powered thermostats.
What model does the 24Z17 replace?
The Lennox 24Z17 is the official manufacturer-designated replacement for 51M37 and the older L3532H series, offering the same footprint and wiring terminal designations.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Lennox 24Z17 Thermostat
The Lennox 24Z17 ComfortSense 3000 is an industrial-grade programmable thermostat engineered for precise climate control in both residential and light commercial HVAC applications. As the direct replacement for Lennox 51M37, this L3532U model is a universal solution capable of managing up to 3 heat / 2 cool stages. Designed for high-reliability environments, it features 5-2 day programming, allowing contractors to customize separate schedules for weekdays and weekends with four distinct time periods per day. The unit is hard-wired to the indoor power supply, eliminating the need for batteries and reducing nuisance service calls. Its large, back-lit LCD provides clear system status icons and accurate digital temperature readings, significantly outperforming legacy mechanical controls. For dual-fuel or heat pump installations, the Lennox 24Z17 supports auxiliary heat lockout and is compatible with an optional outdoor temperature sensor to maximize energy-efficient HVAC control and equipment longevity.
Key Benefits for Professionals- Universal Compatibility: Operates seamlessly with conventional gas/oil/electric systems, heat pumps, and dual-fuel configurations.
- Direct OEM Replacement: Replaces discontinued Lennox 51M37 and L3532H models without requiring wiring modifications.
- Advanced Protection: Integrated five-minute compressor short-cycle protection and overheat safety switches (opening at 93°F) safeguard the condenser and furnace.
- Contractor-Friendly Maintenance: Built-in filter monitor and service alerts keep end-users informed of routine maintenance needs, reducing emergency repairs.
- Non-Volatile Memory: Maintains all programmed schedules for up to 24 hours during total power outages.
Is the Lennox 24Z17 compatible with my existing heat pump?
Yes, the Lennox 24Z17 is a universal multi-stage thermostat designed to control up to 3 heating and 2 cooling stages, making it an ideal fit for most standard and high-efficiency heat pump systems.
Does this unit require batteries for operation?
No, this model is hard-wired directly to the 24VAC indoor unit power supply, ensuring consistent operation without the failure points associated with battery-powered thermostats.
What model does the 24Z17 replace?
The Lennox 24Z17 is the official manufacturer-designated replacement for 51M37 and the older L3532H series, offering the same footprint and wiring terminal designations.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The Lennox 24Z17 ComfortSense 3000 is an industrial-grade programmable thermostat engineered for precise climate control in both residential and light commercial HVAC applications. As the direct replacement for Lennox 51M37, this L3532U model is a universal solution capable of managing up to 3 heat / 2 cool stages. Designed for high-reliability environments, it features 5-2 day programming, allowing contractors to customize separate schedules for weekdays and weekends with four distinct time periods per day. The unit is hard-wired to the indoor power supply, eliminating the need for batteries and reducing nuisance service calls. Its large, back-lit LCD provides clear system status icons and accurate digital temperature readings, significantly outperforming legacy mechanical controls. For dual-fuel or heat pump installations, the Lennox 24Z17 supports auxiliary heat lockout and is compatible with an optional outdoor temperature sensor to maximize energy-efficient HVAC control and equipment longevity.
Key Benefits for Professionals- Universal Compatibility: Operates seamlessly with conventional gas/oil/electric systems, heat pumps, and dual-fuel configurations.
- Direct OEM Replacement: Replaces discontinued Lennox 51M37 and L3532H models without requiring wiring modifications.
- Advanced Protection: Integrated five-minute compressor short-cycle protection and overheat safety switches (opening at 93°F) safeguard the condenser and furnace.
- Contractor-Friendly Maintenance: Built-in filter monitor and service alerts keep end-users informed of routine maintenance needs, reducing emergency repairs.
- Non-Volatile Memory: Maintains all programmed schedules for up to 24 hours during total power outages.
Is the Lennox 24Z17 compatible with my existing heat pump?
Yes, the Lennox 24Z17 is a universal multi-stage thermostat designed to control up to 3 heating and 2 cooling stages, making it an ideal fit for most standard and high-efficiency heat pump systems.
Does this unit require batteries for operation?
No, this model is hard-wired directly to the 24VAC indoor unit power supply, ensuring consistent operation without the failure points associated with battery-powered thermostats.
What model does the 24Z17 replace?
The Lennox 24Z17 is the official manufacturer-designated replacement for 51M37 and the older L3532H series, offering the same footprint and wiring terminal designations.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
