LENNOX Thermostat: Heat and Cool, Manual, B/C/G/O/Rc/Rh/W1/Y1, Auto-On, Cool-Heat-Off
The LENNOX 24Z12 is a rectangular digital thermostat for heat and cool applications, operating on 24V AC with a manual changeover type and system settings of Cool-Heat-Off. It features a slide switch control, Auto-On…
SKU 3G-OTH-70354
Need installation or engineering help?
Ask a question
Product Description
The LENNOX 24Z12 is a rectangular digital thermostat for heat and cool applications, operating on 24V AC with a manual changeover type and system settings of Cool-Heat-Off. It features a slide switch control, Auto-On fan setting, optional Celsius display, and a temperature differential of ± 1 °F. The thermostat mounts horizontally and includes terminal designation G.
Frequently Asked Questions
What is the LENNOX 24Z12 thermostat used for?
The LENNOX 24Z12 is a manual-changeover digital thermostat designed for heat and cool applications in residential or light commercial HVAC systems. It controls 24V AC heating and cooling equipment, offering Cool-Heat-Off system settings and an Auto-On fan setting for basic temperature regulation.
What are the specifications of the LENNOX 24Z12 thermostat?
The LENNOX 24Z12 operates on 24V AC with a temperature differential of ± 1 °F. It features manual changeover, Cool-Heat-Off system settings, Auto-On fan setting, optional Celsius display, and terminal designation G. The rectangular thermostat mounts horizontally and uses a slide switch control.
Where to buy the LENNOX 24Z12 thermostat worldwide?
3G Electric supplies the LENNOX 24Z12 thermostat to customers worldwide. As a global industrial equipment distributor, we handle full logistics, customs clearance, and delivery to your location. Contact us for availability and to place an order for this manual-changeover digital thermostat.
How to install the LENNOX 24Z12 thermostat?
To install the LENNOX 24Z12, first turn off power to the HVAC system. Mount the thermostat horizontally on a wall, connect the 24V AC wires to the G terminal and other required terminals per your system's wiring diagram. Secure the base, attach the faceplate, restore power, and set the slide switch to desired mode.
Used in
Common applications for LENNOXLENNOX Products
3G Electric supplies LENNOX digital thermostats. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.




