Carrier 337662-704 Pressure Switch Assembly
The Carrier 337662-704 Pressure Switch Assembly is a critical OEM replacement component designed for high-efficiency condensing furnaces. This assembly features a triple-switch configuration calibrated to monitor inducer motor performance and vent system integrity across multiple stages of operation. To ensure precise combustion safety, the unit is factory-set with specific pressure trip points: 0.65" WC for low stage, 0.90" WC for medium stage, and 1.40" WC for high-fire operation. By detecting the exact differential pressure within the collector box and venting system, this furnace air pressure switch prevents the burner from igniting if the flue gas scavenging is insufficient or if a venter vacuum suction failure is detected.
Built for compatibility with Carrier, Bryant, and Payne 59MN and 987M series units, this genuine OEM furnace part replaces older vacuum-actuated sensors to maintain tight operational tolerances. Technicians should verify hose barb orientation and ensure all silicone tubing is clear of moisture or cracks during installation to prevent nuisance tripping of the limit control circuit.
Key Benefits- Multi-Stage Monitoring: Three independent switches calibrated at 0.65", 0.90", and 1.40" WC for precise airflow verification.
- Direct OEM Fit: Drop-in replacement for 337662-704, ensuring correct electrical termination and mounting alignment.
- System Safety: Safely interrupts the ignition sequence if the draft inducer fails to reach the required RPM or if the flue is obstructed.
- Durable Construction: Engineered to withstand the high-heat and moisture-heavy environment of modern condensing furnaces.
What causes a pressure switch to stay open?
Common culprits include a failing inducer motor, blocked vent pipes (birds' nests or ice), a clogged condensate drain, or cracked vacuum tubing. Always check for static pressure deviations before replacing the 337662-704.
Can I use a generic adjustable switch instead of this assembly?
No. This Carrier 337662-704 contains three specific switches with varied setpoints required for multi-stage furnace logic. A single-pole generic switch will result in system error codes and unsafe operation.
Where are these switches usually located?
They are typically mounted near the inducer housing. Ensure the small sensing ports are facing the correct direction to avoid water buildup in the diaphragm during the cooling cycle or high-fire heating.
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: $123.86
-65%$123.86
$43.35Carrier 337662-704 Pressure Switch Assembly
The Carrier 337662-704 Pressure Switch Assembly is a critical OEM replacement component designed for high-efficiency condensing furnaces. This assembly features a triple-switch configuration calibrated to monitor inducer motor performance and vent system integrity across multiple stages of operation. To ensure precise combustion safety, the unit is factory-set with specific pressure trip points: 0.65" WC for low stage, 0.90" WC for medium stage, and 1.40" WC for high-fire operation. By detecting the exact differential pressure within the collector box and venting system, this furnace air pressure switch prevents the burner from igniting if the flue gas scavenging is insufficient or if a venter vacuum suction failure is detected.
Built for compatibility with Carrier, Bryant, and Payne 59MN and 987M series units, this genuine OEM furnace part replaces older vacuum-actuated sensors to maintain tight operational tolerances. Technicians should verify hose barb orientation and ensure all silicone tubing is clear of moisture or cracks during installation to prevent nuisance tripping of the limit control circuit.
Key Benefits- Multi-Stage Monitoring: Three independent switches calibrated at 0.65", 0.90", and 1.40" WC for precise airflow verification.
- Direct OEM Fit: Drop-in replacement for 337662-704, ensuring correct electrical termination and mounting alignment.
- System Safety: Safely interrupts the ignition sequence if the draft inducer fails to reach the required RPM or if the flue is obstructed.
- Durable Construction: Engineered to withstand the high-heat and moisture-heavy environment of modern condensing furnaces.
What causes a pressure switch to stay open?
Common culprits include a failing inducer motor, blocked vent pipes (birds' nests or ice), a clogged condensate drain, or cracked vacuum tubing. Always check for static pressure deviations before replacing the 337662-704.
Can I use a generic adjustable switch instead of this assembly?
No. This Carrier 337662-704 contains three specific switches with varied setpoints required for multi-stage furnace logic. A single-pole generic switch will result in system error codes and unsafe operation.
Where are these switches usually located?
They are typically mounted near the inducer housing. Ensure the small sensing ports are facing the correct direction to avoid water buildup in the diaphragm during the cooling cycle or high-fire heating.
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 Carrier 337662-704 Pressure Switch Assembly is a critical OEM replacement component designed for high-efficiency condensing furnaces. This assembly features a triple-switch configuration calibrated to monitor inducer motor performance and vent system integrity across multiple stages of operation. To ensure precise combustion safety, the unit is factory-set with specific pressure trip points: 0.65" WC for low stage, 0.90" WC for medium stage, and 1.40" WC for high-fire operation. By detecting the exact differential pressure within the collector box and venting system, this furnace air pressure switch prevents the burner from igniting if the flue gas scavenging is insufficient or if a venter vacuum suction failure is detected.
Built for compatibility with Carrier, Bryant, and Payne 59MN and 987M series units, this genuine OEM furnace part replaces older vacuum-actuated sensors to maintain tight operational tolerances. Technicians should verify hose barb orientation and ensure all silicone tubing is clear of moisture or cracks during installation to prevent nuisance tripping of the limit control circuit.
Key Benefits- Multi-Stage Monitoring: Three independent switches calibrated at 0.65", 0.90", and 1.40" WC for precise airflow verification.
- Direct OEM Fit: Drop-in replacement for 337662-704, ensuring correct electrical termination and mounting alignment.
- System Safety: Safely interrupts the ignition sequence if the draft inducer fails to reach the required RPM or if the flue is obstructed.
- Durable Construction: Engineered to withstand the high-heat and moisture-heavy environment of modern condensing furnaces.
What causes a pressure switch to stay open?
Common culprits include a failing inducer motor, blocked vent pipes (birds' nests or ice), a clogged condensate drain, or cracked vacuum tubing. Always check for static pressure deviations before replacing the 337662-704.
Can I use a generic adjustable switch instead of this assembly?
No. This Carrier 337662-704 contains three specific switches with varied setpoints required for multi-stage furnace logic. A single-pole generic switch will result in system error codes and unsafe operation.
Where are these switches usually located?
They are typically mounted near the inducer housing. Ensure the small sensing ports are facing the correct direction to avoid water buildup in the diaphragm during the cooling cycle or high-fire heating.
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.
