Lennox 16D74 Relay
The Lennox 16D74 Time Delay Relay is a critical solid-state control designed for precise timing in residential and commercial air handling units. As a veteran-grade HVAC replacement part, this 24V time delay relay (model 105241-01) functions as a dual-action timer, providing a fixed 1-second delay-on-make (ON-delay) to prevent simultaneous component startup and a fixed 45-second delay-on-break (OFF-delay) to allow the blower to dissipate remaining latent heat or cooling from the coil. Manufactured by Littelfuse SSAC as part of the CT1S45 series, this encapsulated OEM Lennox relay ensures high reliability in demanding environments. It serves as the direct R76700452 replacement relay and is compatible with Lennox CBX25UH and Aire-Flo BCS3M air handlers. Professionals rely on its 0.75 Amp rating and normally open (N.O.) configuration to maintain system efficiency and protect compressors from short-cycling.
Key Benefits
- Dual-Timing Logic: Combines a 1s delay-on-make and 45s delay-on-break for optimal HVAC blower control and sequence management.
- Superior Durability: Fully solid-state and encapsulated design resists vibration, moisture, and debris in air handler cabinets.
- OEM Compatibility: Authentic Lennox-approved replacement for 19W66, 104772-01, and 76700452 part numbers.
- Simplified Integration: Part of the SSAC CT series, allowing for easy interconnectability with other control modules in the system.
- Protection: Critical for preventing circuit overload during startup and maximizing SEER efficiency by purging conditioned air.
Common Questions
What does a delay-on-break relay do in an air handler?
In systems like the Lennox CBX25UH, the delay-on-break function keeps the blower motor running for 45 seconds after the thermostat reaches its setpoint. This ensures that all remaining heating or cooling is delivered to the space, improving efficiency and preventing heat stress on the heat strip or coil.
Can the 16D74 relay be used for 120V or 240V circuits?
No, the Lennox 16D74 is specifically rated for 24 VAC control circuits. Attempting to use this relay with line voltage will result in immediate component failure.
Is this a direct fit for the Littelfuse CT1S45?
Yes, the Lennox 16D74 is the Lennox-branded version of the Littelfuse SSAC CT1S45. It features the same 0.75 Amp solid-state output and fixed timing intervals.
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: $50.76
-65%$50.76
$17.77Lennox 16D74 Relay
The Lennox 16D74 Time Delay Relay is a critical solid-state control designed for precise timing in residential and commercial air handling units. As a veteran-grade HVAC replacement part, this 24V time delay relay (model 105241-01) functions as a dual-action timer, providing a fixed 1-second delay-on-make (ON-delay) to prevent simultaneous component startup and a fixed 45-second delay-on-break (OFF-delay) to allow the blower to dissipate remaining latent heat or cooling from the coil. Manufactured by Littelfuse SSAC as part of the CT1S45 series, this encapsulated OEM Lennox relay ensures high reliability in demanding environments. It serves as the direct R76700452 replacement relay and is compatible with Lennox CBX25UH and Aire-Flo BCS3M air handlers. Professionals rely on its 0.75 Amp rating and normally open (N.O.) configuration to maintain system efficiency and protect compressors from short-cycling.
Key Benefits
- Dual-Timing Logic: Combines a 1s delay-on-make and 45s delay-on-break for optimal HVAC blower control and sequence management.
- Superior Durability: Fully solid-state and encapsulated design resists vibration, moisture, and debris in air handler cabinets.
- OEM Compatibility: Authentic Lennox-approved replacement for 19W66, 104772-01, and 76700452 part numbers.
- Simplified Integration: Part of the SSAC CT series, allowing for easy interconnectability with other control modules in the system.
- Protection: Critical for preventing circuit overload during startup and maximizing SEER efficiency by purging conditioned air.
Common Questions
What does a delay-on-break relay do in an air handler?
In systems like the Lennox CBX25UH, the delay-on-break function keeps the blower motor running for 45 seconds after the thermostat reaches its setpoint. This ensures that all remaining heating or cooling is delivered to the space, improving efficiency and preventing heat stress on the heat strip or coil.
Can the 16D74 relay be used for 120V or 240V circuits?
No, the Lennox 16D74 is specifically rated for 24 VAC control circuits. Attempting to use this relay with line voltage will result in immediate component failure.
Is this a direct fit for the Littelfuse CT1S45?
Yes, the Lennox 16D74 is the Lennox-branded version of the Littelfuse SSAC CT1S45. It features the same 0.75 Amp solid-state output and fixed timing intervals.
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 16D74 Time Delay Relay is a critical solid-state control designed for precise timing in residential and commercial air handling units. As a veteran-grade HVAC replacement part, this 24V time delay relay (model 105241-01) functions as a dual-action timer, providing a fixed 1-second delay-on-make (ON-delay) to prevent simultaneous component startup and a fixed 45-second delay-on-break (OFF-delay) to allow the blower to dissipate remaining latent heat or cooling from the coil. Manufactured by Littelfuse SSAC as part of the CT1S45 series, this encapsulated OEM Lennox relay ensures high reliability in demanding environments. It serves as the direct R76700452 replacement relay and is compatible with Lennox CBX25UH and Aire-Flo BCS3M air handlers. Professionals rely on its 0.75 Amp rating and normally open (N.O.) configuration to maintain system efficiency and protect compressors from short-cycling.
Key Benefits
- Dual-Timing Logic: Combines a 1s delay-on-make and 45s delay-on-break for optimal HVAC blower control and sequence management.
- Superior Durability: Fully solid-state and encapsulated design resists vibration, moisture, and debris in air handler cabinets.
- OEM Compatibility: Authentic Lennox-approved replacement for 19W66, 104772-01, and 76700452 part numbers.
- Simplified Integration: Part of the SSAC CT series, allowing for easy interconnectability with other control modules in the system.
- Protection: Critical for preventing circuit overload during startup and maximizing SEER efficiency by purging conditioned air.
Common Questions
What does a delay-on-break relay do in an air handler?
In systems like the Lennox CBX25UH, the delay-on-break function keeps the blower motor running for 45 seconds after the thermostat reaches its setpoint. This ensures that all remaining heating or cooling is delivered to the space, improving efficiency and preventing heat stress on the heat strip or coil.
Can the 16D74 relay be used for 120V or 240V circuits?
No, the Lennox 16D74 is specifically rated for 24 VAC control circuits. Attempting to use this relay with line voltage will result in immediate component failure.
Is this a direct fit for the Littelfuse CT1S45?
Yes, the Lennox 16D74 is the Lennox-branded version of the Littelfuse SSAC CT1S45. It features the same 0.75 Amp solid-state output and fixed timing intervals.
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.
