Lennox 38631 Transformer
The Lennox 38631 Transformer is a critical OEM replacement part designed for precise voltage regulation within residential and light commercial HVAC control systems. This heavy-duty step-down transformer features a 120V primary input and a 24V secondary output, providing a stable 30VA power rating required to energize high-draw components such as furnace control boards, 24V thermostats, and ignition modules. Specifically engineered as a direct fit for a broad range of Lennox furnace series (including the G8, G12, G14, and G21 models), this Class 2 transformer ensures impedance protection and maintains the electrical integrity of the low-voltage circuit. For the service technician, utilizing a genuine Lennox 38631 (also indexed as P-8-9490) eliminates compatibility guesswork during furnace repair and prevents common diagnostic errors associated with aftermarket universal alternatives.
Key Benefits- Universal Lennox Compatibility: Serves as a drop-in replacement for legacy and modern units, replacing part numbers 38622, 31931, and P-8-9308.
- Stable 30VA Output: Delivers sufficient volt-ampere capacity to support multiple 24V accessories without voltage drop or overheating.
- OEM Technical Standards: Built to Lennox 38631 specifications to match original equipment duty cycles and environmental stressors.
- Simplified Wiring: Features color-coded leads (typically Black/White primary and Blue/Yellow secondary) for rapid field installation.
Is the Lennox 38631 compatible with 208V or 240V systems?
No, this specific model is a dedicated 120V to 24V transformer. For 208/240V applications, a multi-tap or dedicated high-voltage primary transformer must be used to prevent internal winding failure.
What causes a 30VA control transformer to fail prematurely?
Premature failure is often caused by a short in the 24V circuit, such as a grounded contactor coil or a pinched thermostat wire, which exceeds the 30VA power rating.
Can I use this to replace a 40VA transformer?
It is not recommended to downsize. If your original system utilized a 40VA transformer, you should maintain that capacity to ensure the circuit has enough overhead for all connected HVAC controls.
This item is not eligible for free shipping.
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: $49.64
-65%$49.64
$17.37Lennox 38631 Transformer
The Lennox 38631 Transformer is a critical OEM replacement part designed for precise voltage regulation within residential and light commercial HVAC control systems. This heavy-duty step-down transformer features a 120V primary input and a 24V secondary output, providing a stable 30VA power rating required to energize high-draw components such as furnace control boards, 24V thermostats, and ignition modules. Specifically engineered as a direct fit for a broad range of Lennox furnace series (including the G8, G12, G14, and G21 models), this Class 2 transformer ensures impedance protection and maintains the electrical integrity of the low-voltage circuit. For the service technician, utilizing a genuine Lennox 38631 (also indexed as P-8-9490) eliminates compatibility guesswork during furnace repair and prevents common diagnostic errors associated with aftermarket universal alternatives.
Key Benefits- Universal Lennox Compatibility: Serves as a drop-in replacement for legacy and modern units, replacing part numbers 38622, 31931, and P-8-9308.
- Stable 30VA Output: Delivers sufficient volt-ampere capacity to support multiple 24V accessories without voltage drop or overheating.
- OEM Technical Standards: Built to Lennox 38631 specifications to match original equipment duty cycles and environmental stressors.
- Simplified Wiring: Features color-coded leads (typically Black/White primary and Blue/Yellow secondary) for rapid field installation.
Is the Lennox 38631 compatible with 208V or 240V systems?
No, this specific model is a dedicated 120V to 24V transformer. For 208/240V applications, a multi-tap or dedicated high-voltage primary transformer must be used to prevent internal winding failure.
What causes a 30VA control transformer to fail prematurely?
Premature failure is often caused by a short in the 24V circuit, such as a grounded contactor coil or a pinched thermostat wire, which exceeds the 30VA power rating.
Can I use this to replace a 40VA transformer?
It is not recommended to downsize. If your original system utilized a 40VA transformer, you should maintain that capacity to ensure the circuit has enough overhead for all connected HVAC controls.
This item is not eligible for free shipping.
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 38631 Transformer is a critical OEM replacement part designed for precise voltage regulation within residential and light commercial HVAC control systems. This heavy-duty step-down transformer features a 120V primary input and a 24V secondary output, providing a stable 30VA power rating required to energize high-draw components such as furnace control boards, 24V thermostats, and ignition modules. Specifically engineered as a direct fit for a broad range of Lennox furnace series (including the G8, G12, G14, and G21 models), this Class 2 transformer ensures impedance protection and maintains the electrical integrity of the low-voltage circuit. For the service technician, utilizing a genuine Lennox 38631 (also indexed as P-8-9490) eliminates compatibility guesswork during furnace repair and prevents common diagnostic errors associated with aftermarket universal alternatives.
Key Benefits- Universal Lennox Compatibility: Serves as a drop-in replacement for legacy and modern units, replacing part numbers 38622, 31931, and P-8-9308.
- Stable 30VA Output: Delivers sufficient volt-ampere capacity to support multiple 24V accessories without voltage drop or overheating.
- OEM Technical Standards: Built to Lennox 38631 specifications to match original equipment duty cycles and environmental stressors.
- Simplified Wiring: Features color-coded leads (typically Black/White primary and Blue/Yellow secondary) for rapid field installation.
Is the Lennox 38631 compatible with 208V or 240V systems?
No, this specific model is a dedicated 120V to 24V transformer. For 208/240V applications, a multi-tap or dedicated high-voltage primary transformer must be used to prevent internal winding failure.
What causes a 30VA control transformer to fail prematurely?
Premature failure is often caused by a short in the 24V circuit, such as a grounded contactor coil or a pinched thermostat wire, which exceeds the 30VA power rating.
Can I use this to replace a 40VA transformer?
It is not recommended to downsize. If your original system utilized a 40VA transformer, you should maintain that capacity to ensure the circuit has enough overhead for all connected HVAC controls.
This item is not eligible for free shipping.
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.
