Trane CNT4990 Pressure Control
The Trane CNT4990 is a high-precision HVAC air pressure control switch engineered for critical monitoring in residential and light-commercial systems. This OEM Trane replacement part features a fixed set point of 0.26" WC, making it a vital safety component for sensing draft in inducer fan assemblies and ensuring proper airflow before ignition. With its SPST (Single Pole Single Throw) contact configuration, the CNT4990 provides reliable circuit closure when the differential pressure reaches the calibrated threshold.
Designed for professional-grade reliability, this 0.26 inch water column pressure switch is rated for 24V control circuits (approximately 28 VA). It includes a robust integrated mounting bracket and a specialized positive connector to streamline installation in tight blower housings. Replacing a failed Trane furnace pressure switch with this genuine component ensures the system maintains exact factory-specified safety margins and operational efficiency across venting and combustion sequences. Its rugged construction is built to withstand the high-cycle demands of modern high-efficiency furnaces and air handlers.
Key Benefits for Technicians- Factory Calibrated Precision: Fixed 0.26" WC set point ensures accurate draft sensing for safety interlock circuits.
- Direct OEM Compatibility: Replaces existing Trane CNT04990 and CNT4990 units without requiring bracket or wiring modifications.
- Standard 24V Integration: Rated for low-voltage signal handling in standard HVAC control boards.
- Enhanced Connectivity: Features a positive connector design for high-vibration resistance in furnace inducer environments.
- Compact Footprint: Integrated flange allows for secure mounting in restricted cabinets or on motor shells.
What happens if the pressure switch set point doesn't match the original?
Using a switch with an incorrect "WC rating can lead to intermittent "no heat" calls or dangerous combustion conditions. Always verify the 0.26" WC specification on the old switch label before installing the Trane CNT4990.
How do I troubleshoot a CNT4990 that isn't closing?
Check for cracked pressure tubing, a restricted flue, or a failing inducer motor. If the pressure is sufficient but the SPST contacts remain open, the internal diaphragm or electrical contacts may be fouled.
Can this be used as a universal pressure switch?
While functionally an air pressure switch, it is specifically calibrated for Trane/American Standard induction systems. Cross-referencing technical data is essential for any non-direct replacement application.
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: $113.41
-65%$113.41
$39.69Trane CNT4990 Pressure Control
The Trane CNT4990 is a high-precision HVAC air pressure control switch engineered for critical monitoring in residential and light-commercial systems. This OEM Trane replacement part features a fixed set point of 0.26" WC, making it a vital safety component for sensing draft in inducer fan assemblies and ensuring proper airflow before ignition. With its SPST (Single Pole Single Throw) contact configuration, the CNT4990 provides reliable circuit closure when the differential pressure reaches the calibrated threshold.
Designed for professional-grade reliability, this 0.26 inch water column pressure switch is rated for 24V control circuits (approximately 28 VA). It includes a robust integrated mounting bracket and a specialized positive connector to streamline installation in tight blower housings. Replacing a failed Trane furnace pressure switch with this genuine component ensures the system maintains exact factory-specified safety margins and operational efficiency across venting and combustion sequences. Its rugged construction is built to withstand the high-cycle demands of modern high-efficiency furnaces and air handlers.
Key Benefits for Technicians- Factory Calibrated Precision: Fixed 0.26" WC set point ensures accurate draft sensing for safety interlock circuits.
- Direct OEM Compatibility: Replaces existing Trane CNT04990 and CNT4990 units without requiring bracket or wiring modifications.
- Standard 24V Integration: Rated for low-voltage signal handling in standard HVAC control boards.
- Enhanced Connectivity: Features a positive connector design for high-vibration resistance in furnace inducer environments.
- Compact Footprint: Integrated flange allows for secure mounting in restricted cabinets or on motor shells.
What happens if the pressure switch set point doesn't match the original?
Using a switch with an incorrect "WC rating can lead to intermittent "no heat" calls or dangerous combustion conditions. Always verify the 0.26" WC specification on the old switch label before installing the Trane CNT4990.
How do I troubleshoot a CNT4990 that isn't closing?
Check for cracked pressure tubing, a restricted flue, or a failing inducer motor. If the pressure is sufficient but the SPST contacts remain open, the internal diaphragm or electrical contacts may be fouled.
Can this be used as a universal pressure switch?
While functionally an air pressure switch, it is specifically calibrated for Trane/American Standard induction systems. Cross-referencing technical data is essential for any non-direct replacement application.
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 Trane CNT4990 is a high-precision HVAC air pressure control switch engineered for critical monitoring in residential and light-commercial systems. This OEM Trane replacement part features a fixed set point of 0.26" WC, making it a vital safety component for sensing draft in inducer fan assemblies and ensuring proper airflow before ignition. With its SPST (Single Pole Single Throw) contact configuration, the CNT4990 provides reliable circuit closure when the differential pressure reaches the calibrated threshold.
Designed for professional-grade reliability, this 0.26 inch water column pressure switch is rated for 24V control circuits (approximately 28 VA). It includes a robust integrated mounting bracket and a specialized positive connector to streamline installation in tight blower housings. Replacing a failed Trane furnace pressure switch with this genuine component ensures the system maintains exact factory-specified safety margins and operational efficiency across venting and combustion sequences. Its rugged construction is built to withstand the high-cycle demands of modern high-efficiency furnaces and air handlers.
Key Benefits for Technicians- Factory Calibrated Precision: Fixed 0.26" WC set point ensures accurate draft sensing for safety interlock circuits.
- Direct OEM Compatibility: Replaces existing Trane CNT04990 and CNT4990 units without requiring bracket or wiring modifications.
- Standard 24V Integration: Rated for low-voltage signal handling in standard HVAC control boards.
- Enhanced Connectivity: Features a positive connector design for high-vibration resistance in furnace inducer environments.
- Compact Footprint: Integrated flange allows for secure mounting in restricted cabinets or on motor shells.
What happens if the pressure switch set point doesn't match the original?
Using a switch with an incorrect "WC rating can lead to intermittent "no heat" calls or dangerous combustion conditions. Always verify the 0.26" WC specification on the old switch label before installing the Trane CNT4990.
How do I troubleshoot a CNT4990 that isn't closing?
Check for cracked pressure tubing, a restricted flue, or a failing inducer motor. If the pressure is sufficient but the SPST contacts remain open, the internal diaphragm or electrical contacts may be fouled.
Can this be used as a universal pressure switch?
While functionally an air pressure switch, it is specifically calibrated for Trane/American Standard induction systems. Cross-referencing technical data is essential for any non-direct replacement application.
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.
