Lennox 19W88 Transformer
The Lennox 19W88 Transformer is a high-reliability technical component engineered for precision voltage step-down in commercial and residential HVAC systems. As a genuine Lennox 100972-01 OEM part, this Class 2 transformer provides a stable 24V secondary output from a 120V primary source, rated at 40VA for consistent power delivery to critical control circuits. Designed for heavy-duty applications, it features a rugged foot mount configuration and 1/4-inch quick-connect terminals for a secure, professional interface. This component is the primary power source for your system's "brain," energizing the HVAC control board, thermostat, and ignition sequences. Whether you are performing a furnace transformer replacement or troubleshooting a 24V short circuit, the 19W88 offers the exact electrical impedance and thermal protection required by Lennox specifications to prevent inductive load failures and ensure long-term operational stability in the field.
Key Benefits- OEM Compatibility: Exact replacement for Lennox 19W88 and 100972-01, ensuring correct footprint and electrical matching for Lennox, Allied, and Armstrong units.
- High Power Density: The 40VA rating supports complex control strings, including smart thermostats, zone dampers, and multiple relay coils without voltage sag.
- Standardized Integration: Features 120V to 24V conversion with standard color-coded leads or quick-connects for rapid installation during service calls.
- Industrial Grade Build: Specialized lamination reduces harmonic humming and vibration, protecting the internal windings from premature thermal degradation.
- How do I test if my 19W88 transformer is failed? Use a multimeter to check for 120V at the primary side. If primary voltage is present but the secondary side shows 0V (and any integrated breakers are reset), the internal windings are likely open.
- Can I use this 40VA transformer to replace a 30VA model? Yes, upgrading to a higher VA rating like this 40VA HVAC transformer is acceptable as it provides more "headroom" for the control circuit, though you must never go lower than the original spec.
- What causes this transformer to blow repeatedly? Frequent failure is usually caused by a low-voltage short in the thermostat wiring or a failing contactor coil drawing excessive current on the 24V circuit.
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: $31.57
-65%$31.57
$11.05Lennox 19W88 Transformer
The Lennox 19W88 Transformer is a high-reliability technical component engineered for precision voltage step-down in commercial and residential HVAC systems. As a genuine Lennox 100972-01 OEM part, this Class 2 transformer provides a stable 24V secondary output from a 120V primary source, rated at 40VA for consistent power delivery to critical control circuits. Designed for heavy-duty applications, it features a rugged foot mount configuration and 1/4-inch quick-connect terminals for a secure, professional interface. This component is the primary power source for your system's "brain," energizing the HVAC control board, thermostat, and ignition sequences. Whether you are performing a furnace transformer replacement or troubleshooting a 24V short circuit, the 19W88 offers the exact electrical impedance and thermal protection required by Lennox specifications to prevent inductive load failures and ensure long-term operational stability in the field.
Key Benefits- OEM Compatibility: Exact replacement for Lennox 19W88 and 100972-01, ensuring correct footprint and electrical matching for Lennox, Allied, and Armstrong units.
- High Power Density: The 40VA rating supports complex control strings, including smart thermostats, zone dampers, and multiple relay coils without voltage sag.
- Standardized Integration: Features 120V to 24V conversion with standard color-coded leads or quick-connects for rapid installation during service calls.
- Industrial Grade Build: Specialized lamination reduces harmonic humming and vibration, protecting the internal windings from premature thermal degradation.
- How do I test if my 19W88 transformer is failed? Use a multimeter to check for 120V at the primary side. If primary voltage is present but the secondary side shows 0V (and any integrated breakers are reset), the internal windings are likely open.
- Can I use this 40VA transformer to replace a 30VA model? Yes, upgrading to a higher VA rating like this 40VA HVAC transformer is acceptable as it provides more "headroom" for the control circuit, though you must never go lower than the original spec.
- What causes this transformer to blow repeatedly? Frequent failure is usually caused by a low-voltage short in the thermostat wiring or a failing contactor coil drawing excessive current on the 24V circuit.
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.
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Description
The Lennox 19W88 Transformer is a high-reliability technical component engineered for precision voltage step-down in commercial and residential HVAC systems. As a genuine Lennox 100972-01 OEM part, this Class 2 transformer provides a stable 24V secondary output from a 120V primary source, rated at 40VA for consistent power delivery to critical control circuits. Designed for heavy-duty applications, it features a rugged foot mount configuration and 1/4-inch quick-connect terminals for a secure, professional interface. This component is the primary power source for your system's "brain," energizing the HVAC control board, thermostat, and ignition sequences. Whether you are performing a furnace transformer replacement or troubleshooting a 24V short circuit, the 19W88 offers the exact electrical impedance and thermal protection required by Lennox specifications to prevent inductive load failures and ensure long-term operational stability in the field.
Key Benefits- OEM Compatibility: Exact replacement for Lennox 19W88 and 100972-01, ensuring correct footprint and electrical matching for Lennox, Allied, and Armstrong units.
- High Power Density: The 40VA rating supports complex control strings, including smart thermostats, zone dampers, and multiple relay coils without voltage sag.
- Standardized Integration: Features 120V to 24V conversion with standard color-coded leads or quick-connects for rapid installation during service calls.
- Industrial Grade Build: Specialized lamination reduces harmonic humming and vibration, protecting the internal windings from premature thermal degradation.
- How do I test if my 19W88 transformer is failed? Use a multimeter to check for 120V at the primary side. If primary voltage is present but the secondary side shows 0V (and any integrated breakers are reset), the internal windings are likely open.
- Can I use this 40VA transformer to replace a 30VA model? Yes, upgrading to a higher VA rating like this 40VA HVAC transformer is acceptable as it provides more "headroom" for the control circuit, though you must never go lower than the original spec.
- What causes this transformer to blow repeatedly? Frequent failure is usually caused by a low-voltage short in the thermostat wiring or a failing contactor coil drawing excessive current on the 24V circuit.
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.
