Lennox 38M45 Transformer
The Lennox 38M45 Transformer is a critical HVAC 40VA step-down transformer designed for reliable voltage regulation in Lennox residential and commercial units. This 208/240V to 24V transformer serves as a direct replacement for Lennox 38M4501, providing the necessary low-voltage power for thermostats, gas valves, and integrated furnace controllers. Built for durability in high-cycle environments, it features a primary input rated for dual-voltage 208/240V configurations and a secondary 24V AC output. For technicians performing diagnostics, this component is essential for resolving low voltage circuit failures or replacing blown control transformers caused by secondary-side shorts. The foot-mount design ensures quick installation within the cabinet, maintaining the integrity of the 24V control circuit. Professional installation is required to ensure proper phasing and to avoid overloading the 40VA capacity during peak demand on the 24V rail.
- Direct OEM Match: Fully interchangeable with Lennox 38M4501 for seamless mechanical and electrical fit.
- Dual-Voltage Versatility: Supports both 208V and 240V primary inputs to accommodate various field power requirements.
- Reliable 40VA Rating: Provides stable 24V power for standard electronic ignition systems and multi-stage control boards.
- Robust Construction: Engineered to withstand the thermal fluctuations common inside HVAC air handlers and furnaces.
Common Contractor Questions
Is the 38M45 compatible with older 38M4501 units?
Yes, the Lennox 38M45 and 38M4501 are electronically and physically identical, serving as 1:1 replacements in all specified Lennox equipment.
What causes a Lennox 40VA transformer to fail?
Most failures occur due to a ground fault or short circuit in the 24V control wiring, such as a contactor coil failure or pinched thermostat wire, which exceeds the VA rating.
Can this transformer be used in 120V applications?
No, this specific model is a 208/240V primary transformer. Attempting to power it with 120V will result in insufficient secondary voltage (approx. 12V), which will not facilitate proper control board operation.
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.
Original: $41.05
-65%$41.05
$14.37Lennox 38M45 Transformer
The Lennox 38M45 Transformer is a critical HVAC 40VA step-down transformer designed for reliable voltage regulation in Lennox residential and commercial units. This 208/240V to 24V transformer serves as a direct replacement for Lennox 38M4501, providing the necessary low-voltage power for thermostats, gas valves, and integrated furnace controllers. Built for durability in high-cycle environments, it features a primary input rated for dual-voltage 208/240V configurations and a secondary 24V AC output. For technicians performing diagnostics, this component is essential for resolving low voltage circuit failures or replacing blown control transformers caused by secondary-side shorts. The foot-mount design ensures quick installation within the cabinet, maintaining the integrity of the 24V control circuit. Professional installation is required to ensure proper phasing and to avoid overloading the 40VA capacity during peak demand on the 24V rail.
- Direct OEM Match: Fully interchangeable with Lennox 38M4501 for seamless mechanical and electrical fit.
- Dual-Voltage Versatility: Supports both 208V and 240V primary inputs to accommodate various field power requirements.
- Reliable 40VA Rating: Provides stable 24V power for standard electronic ignition systems and multi-stage control boards.
- Robust Construction: Engineered to withstand the thermal fluctuations common inside HVAC air handlers and furnaces.
Common Contractor Questions
Is the 38M45 compatible with older 38M4501 units?
Yes, the Lennox 38M45 and 38M4501 are electronically and physically identical, serving as 1:1 replacements in all specified Lennox equipment.
What causes a Lennox 40VA transformer to fail?
Most failures occur due to a ground fault or short circuit in the 24V control wiring, such as a contactor coil failure or pinched thermostat wire, which exceeds the VA rating.
Can this transformer be used in 120V applications?
No, this specific model is a 208/240V primary transformer. Attempting to power it with 120V will result in insufficient secondary voltage (approx. 12V), which will not facilitate proper control board operation.
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 38M45 Transformer is a critical HVAC 40VA step-down transformer designed for reliable voltage regulation in Lennox residential and commercial units. This 208/240V to 24V transformer serves as a direct replacement for Lennox 38M4501, providing the necessary low-voltage power for thermostats, gas valves, and integrated furnace controllers. Built for durability in high-cycle environments, it features a primary input rated for dual-voltage 208/240V configurations and a secondary 24V AC output. For technicians performing diagnostics, this component is essential for resolving low voltage circuit failures or replacing blown control transformers caused by secondary-side shorts. The foot-mount design ensures quick installation within the cabinet, maintaining the integrity of the 24V control circuit. Professional installation is required to ensure proper phasing and to avoid overloading the 40VA capacity during peak demand on the 24V rail.
- Direct OEM Match: Fully interchangeable with Lennox 38M4501 for seamless mechanical and electrical fit.
- Dual-Voltage Versatility: Supports both 208V and 240V primary inputs to accommodate various field power requirements.
- Reliable 40VA Rating: Provides stable 24V power for standard electronic ignition systems and multi-stage control boards.
- Robust Construction: Engineered to withstand the thermal fluctuations common inside HVAC air handlers and furnaces.
Common Contractor Questions
Is the 38M45 compatible with older 38M4501 units?
Yes, the Lennox 38M45 and 38M4501 are electronically and physically identical, serving as 1:1 replacements in all specified Lennox equipment.
What causes a Lennox 40VA transformer to fail?
Most failures occur due to a ground fault or short circuit in the 24V control wiring, such as a contactor coil failure or pinched thermostat wire, which exceeds the VA rating.
Can this transformer be used in 120V applications?
No, this specific model is a 208/240V primary transformer. Attempting to power it with 120V will result in insufficient secondary voltage (approx. 12V), which will not facilitate proper control board operation.
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.
