Trane SWT2979 Pressure Switch
The Trane SWT2979 Pressure Switch is a critical safety component designed for precise draft monitoring in high-efficiency Trane and American Standard furnaces. As a OEM dual pressure switch, this part is the direct replacement for legacy part numbers BA20149 and C342634P62. This 2-stage air pressure switch features a dual-diaphragm configuration engineered to sense specific vacuum thresholds: the high side is rated to open at 1.93" W.C. and close at 2.28" W.C., while the low side opens at 0.97" W.C. and closes at 1.19" W.C. It ensures that the inducer motor is generating sufficient static pressure to safely vent combustion gases before allowing the ignition sequence to proceed. For technicians performing a furnace pressure switch replacement, the SWT2979 provides exact factory-set calibration, 1/4" quick-connect terminals, and robust construction to handle 24 VAC pilot duty applications without premature failure or nuisance tripping.
Key Benefits:
- Direct OEM Replacement: Ensures 100% compatibility with systems requiring BA20149 or C342634P62, eliminating the need for field modifications.
- Precise 2-Stage Monitoring: Specifically calibrated for two-stage heating cycles to maintain HVAC system safety and efficiency.
- Enhanced Durability: Built with high-grade materials to withstand the thermal and vibrational demands of a furnace burner compartment.
- Prevents Back-Drafting: Critical safety interface that shuts down the system if negative pressure in the draft inducer motor is lost.
Common Questions:
How do I troubleshoot a pressure switch error on a Trane furnace?
First, inspect the pressure switch hoses for cracks, water buildup, or debris. Use a manometer to verify that the inducer motor is pulling the required WC rating specified on the Trane SWT2979. If the inducer pulls sufficient vacuum but the switch fails to close, the internal diaphragm or contacts may be faulty.
Can I use a single-stage switch to replace this dual-stage SWT2979?
No. This dual pressure switch is designed to communicate two distinct pressure states to the control board. Using an incorrect switch will prevent the furnace from entering high-fire mode or may cause the system to lock out for safety reasons.
What causes a pressure switch to stay open?
Common culprits include a blocked flue pipe, a restricted secondary heat exchanger, a failing inducer motor, or a clogged condensate drain line in condensing furnaces.
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.
Trane SWT2979 Pressure Switch
The Trane SWT2979 Pressure Switch is a critical safety component designed for precise draft monitoring in high-efficiency Trane and American Standard furnaces. As a OEM dual pressure switch, this part is the direct replacement for legacy part numbers BA20149 and C342634P62. This 2-stage air pressure switch features a dual-diaphragm configuration engineered to sense specific vacuum thresholds: the high side is rated to open at 1.93" W.C. and close at 2.28" W.C., while the low side opens at 0.97" W.C. and closes at 1.19" W.C. It ensures that the inducer motor is generating sufficient static pressure to safely vent combustion gases before allowing the ignition sequence to proceed. For technicians performing a furnace pressure switch replacement, the SWT2979 provides exact factory-set calibration, 1/4" quick-connect terminals, and robust construction to handle 24 VAC pilot duty applications without premature failure or nuisance tripping.
Key Benefits:
- Direct OEM Replacement: Ensures 100% compatibility with systems requiring BA20149 or C342634P62, eliminating the need for field modifications.
- Precise 2-Stage Monitoring: Specifically calibrated for two-stage heating cycles to maintain HVAC system safety and efficiency.
- Enhanced Durability: Built with high-grade materials to withstand the thermal and vibrational demands of a furnace burner compartment.
- Prevents Back-Drafting: Critical safety interface that shuts down the system if negative pressure in the draft inducer motor is lost.
Common Questions:
How do I troubleshoot a pressure switch error on a Trane furnace?
First, inspect the pressure switch hoses for cracks, water buildup, or debris. Use a manometer to verify that the inducer motor is pulling the required WC rating specified on the Trane SWT2979. If the inducer pulls sufficient vacuum but the switch fails to close, the internal diaphragm or contacts may be faulty.
Can I use a single-stage switch to replace this dual-stage SWT2979?
No. This dual pressure switch is designed to communicate two distinct pressure states to the control board. Using an incorrect switch will prevent the furnace from entering high-fire mode or may cause the system to lock out for safety reasons.
What causes a pressure switch to stay open?
Common culprits include a blocked flue pipe, a restricted secondary heat exchanger, a failing inducer motor, or a clogged condensate drain line in condensing furnaces.
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
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Description
The Trane SWT2979 Pressure Switch is a critical safety component designed for precise draft monitoring in high-efficiency Trane and American Standard furnaces. As a OEM dual pressure switch, this part is the direct replacement for legacy part numbers BA20149 and C342634P62. This 2-stage air pressure switch features a dual-diaphragm configuration engineered to sense specific vacuum thresholds: the high side is rated to open at 1.93" W.C. and close at 2.28" W.C., while the low side opens at 0.97" W.C. and closes at 1.19" W.C. It ensures that the inducer motor is generating sufficient static pressure to safely vent combustion gases before allowing the ignition sequence to proceed. For technicians performing a furnace pressure switch replacement, the SWT2979 provides exact factory-set calibration, 1/4" quick-connect terminals, and robust construction to handle 24 VAC pilot duty applications without premature failure or nuisance tripping.
Key Benefits:
- Direct OEM Replacement: Ensures 100% compatibility with systems requiring BA20149 or C342634P62, eliminating the need for field modifications.
- Precise 2-Stage Monitoring: Specifically calibrated for two-stage heating cycles to maintain HVAC system safety and efficiency.
- Enhanced Durability: Built with high-grade materials to withstand the thermal and vibrational demands of a furnace burner compartment.
- Prevents Back-Drafting: Critical safety interface that shuts down the system if negative pressure in the draft inducer motor is lost.
Common Questions:
How do I troubleshoot a pressure switch error on a Trane furnace?
First, inspect the pressure switch hoses for cracks, water buildup, or debris. Use a manometer to verify that the inducer motor is pulling the required WC rating specified on the Trane SWT2979. If the inducer pulls sufficient vacuum but the switch fails to close, the internal diaphragm or contacts may be faulty.
Can I use a single-stage switch to replace this dual-stage SWT2979?
No. This dual pressure switch is designed to communicate two distinct pressure states to the control board. Using an incorrect switch will prevent the furnace from entering high-fire mode or may cause the system to lock out for safety reasons.
What causes a pressure switch to stay open?
Common culprits include a blocked flue pipe, a restricted secondary heat exchanger, a failing inducer motor, or a clogged condensate drain line in condensing furnaces.
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.
