Lennox 74H01 Potential Relay
The Lennox 74H01 Potential Relay is a mission-critical OEM replacement part designed for high-torque motor starting applications in residential heating and commercial air conditioning systems. Engineered to manage compressor start-up cycles, this potential-type motor starting relay features a normally closed (SP N.C.) contact configuration that effectively removes the start capacitor from the circuit once the motor reaches sufficient back electromotive force (BEMF). Standard technical specifications include a 132-148 volt pickup range, a 40-90 volt dropout, and a 336V continuous coil rating. This component is identical to part number 74H0101 and serves as a direct drop-in for units requiring precise timing to safeguard motor windings. Its rugged construction ensures long-term reliability in demanding HVACR environments, preventing premature compressor motor failure while maintaining original factory specifications. For technicians performing field service, this relay is a standard fit for Lennox models including the CHA16, CHP16, and GCS16 series, providing consistent switching performance across 50/60 Hz applications.
Key Benefits- Precise Voltage Sensing: Calibrated for a 132-148V pickup to ensure the start capacitor is engaged only during the critical ignition phase.
- OEM Compatibility: Guaranteed fit for Lennox 74H0101, maintaining system integrity and matching original equipment performance curves.
- Compact & Robust Design: Heavy-duty internal components and a space-saving footprint allow for easy installation in tight electrical control boxes.
- High Continuous Rating: The 336V continuous coil prevents overheating and winding degradation during extended run cycles.
Is the Lennox 74H01 interchangeable with the 74H0101?
Yes, the 74H01 and 74H0101 are functionally and physically identical. They are the same HVAC potential relay manufactured to the same specifications for Lennox equipment.
What are the symptoms of a failing potential relay?
A failed relay often results in "hard starting," where the compressor hums but fails to turn over, or cases where the start capacitor remains in the circuit too long, potentially causing the capacitor to vent or the motor to trip the internal overload.
Does this relay require a specific mounting position?
While many modern potential relays are non-positional, it is best professional practice to mount this unit in the original factory orientation to ensure the internal spring and gravity-assisted contacts operate within their calibrated tolerances.
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: $50.19
-65%$50.19
$17.57Lennox 74H01 Potential Relay
The Lennox 74H01 Potential Relay is a mission-critical OEM replacement part designed for high-torque motor starting applications in residential heating and commercial air conditioning systems. Engineered to manage compressor start-up cycles, this potential-type motor starting relay features a normally closed (SP N.C.) contact configuration that effectively removes the start capacitor from the circuit once the motor reaches sufficient back electromotive force (BEMF). Standard technical specifications include a 132-148 volt pickup range, a 40-90 volt dropout, and a 336V continuous coil rating. This component is identical to part number 74H0101 and serves as a direct drop-in for units requiring precise timing to safeguard motor windings. Its rugged construction ensures long-term reliability in demanding HVACR environments, preventing premature compressor motor failure while maintaining original factory specifications. For technicians performing field service, this relay is a standard fit for Lennox models including the CHA16, CHP16, and GCS16 series, providing consistent switching performance across 50/60 Hz applications.
Key Benefits- Precise Voltage Sensing: Calibrated for a 132-148V pickup to ensure the start capacitor is engaged only during the critical ignition phase.
- OEM Compatibility: Guaranteed fit for Lennox 74H0101, maintaining system integrity and matching original equipment performance curves.
- Compact & Robust Design: Heavy-duty internal components and a space-saving footprint allow for easy installation in tight electrical control boxes.
- High Continuous Rating: The 336V continuous coil prevents overheating and winding degradation during extended run cycles.
Is the Lennox 74H01 interchangeable with the 74H0101?
Yes, the 74H01 and 74H0101 are functionally and physically identical. They are the same HVAC potential relay manufactured to the same specifications for Lennox equipment.
What are the symptoms of a failing potential relay?
A failed relay often results in "hard starting," where the compressor hums but fails to turn over, or cases where the start capacitor remains in the circuit too long, potentially causing the capacitor to vent or the motor to trip the internal overload.
Does this relay require a specific mounting position?
While many modern potential relays are non-positional, it is best professional practice to mount this unit in the original factory orientation to ensure the internal spring and gravity-assisted contacts operate within their calibrated tolerances.
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 74H01 Potential Relay is a mission-critical OEM replacement part designed for high-torque motor starting applications in residential heating and commercial air conditioning systems. Engineered to manage compressor start-up cycles, this potential-type motor starting relay features a normally closed (SP N.C.) contact configuration that effectively removes the start capacitor from the circuit once the motor reaches sufficient back electromotive force (BEMF). Standard technical specifications include a 132-148 volt pickup range, a 40-90 volt dropout, and a 336V continuous coil rating. This component is identical to part number 74H0101 and serves as a direct drop-in for units requiring precise timing to safeguard motor windings. Its rugged construction ensures long-term reliability in demanding HVACR environments, preventing premature compressor motor failure while maintaining original factory specifications. For technicians performing field service, this relay is a standard fit for Lennox models including the CHA16, CHP16, and GCS16 series, providing consistent switching performance across 50/60 Hz applications.
Key Benefits- Precise Voltage Sensing: Calibrated for a 132-148V pickup to ensure the start capacitor is engaged only during the critical ignition phase.
- OEM Compatibility: Guaranteed fit for Lennox 74H0101, maintaining system integrity and matching original equipment performance curves.
- Compact & Robust Design: Heavy-duty internal components and a space-saving footprint allow for easy installation in tight electrical control boxes.
- High Continuous Rating: The 336V continuous coil prevents overheating and winding degradation during extended run cycles.
Is the Lennox 74H01 interchangeable with the 74H0101?
Yes, the 74H01 and 74H0101 are functionally and physically identical. They are the same HVAC potential relay manufactured to the same specifications for Lennox equipment.
What are the symptoms of a failing potential relay?
A failed relay often results in "hard starting," where the compressor hums but fails to turn over, or cases where the start capacitor remains in the circuit too long, potentially causing the capacitor to vent or the motor to trip the internal overload.
Does this relay require a specific mounting position?
While many modern potential relays are non-positional, it is best professional practice to mount this unit in the original factory orientation to ensure the internal spring and gravity-assisted contacts operate within their calibrated tolerances.
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.
