Rheem-Ruud 42-101956-12 Pressure Switch
The Rheem-Ruud 42-101956-12 Pressure Switch is an essential safety component designed for precise draft monitoring in high-efficiency gas furnaces. Functioning as a -0.50" WC SPST pressure switch, this OEM furnace part ensures that the draft inducer motor is moving sufficient air through the heat exchanger before the ignition sequence begins. When the inducer establishes the required negative pressure of -0.50 inches water column, the single pole single throw (SPST) contacts close, completing the 24V circuit to the control board to initiate the hot surface igniter and gas valve operation.
For service technicians, the 42-101956-12 provides a direct OEM replacement for specific Rheem and Ruud furnace models, including the UGRC and RGRC series. It features a robust plastic housing with a single vacuum port and standard spade terminals for quick integration. Using a genuine Rheem-Ruud pressure switch is critical for maintaining the safety integrity of the system, as improper set points can lead to incomplete combustion or nuisance furnace pressure switch lockout codes (typically a 2-blink or 3-blink error on most Protech boards).
Key Benefits for HVAC Professionals:- Precise Calibration: Factory-set at -0.50" WC to ensure accurate safety limit response and prevent hazardous flue gas buildup.
- Direct OEM Compatibility: Engineered specifically for Rheem, Ruud, and WeatherKing gas furnaces, eliminating the risks associated with universal parts.
- Enhanced Reliability: Features self-cleaning contacts to resist environmental contaminants and prevent "fluttering" during high-demand cycles.
- Simple Installation: Standard configuration allows for immediate swap-out in Rheem RGRC-07M and similar induced-draft units.
- How do I test the 42-101956-12? With the furnace calling for heat and the inducer running, use a manometer to verify the negative pressure at the switch port exceeds the -0.50" WC set point. Simultaneously, check for zero ohms across the terminals to confirm the SPST switch has closed.
- What causes this switch to stay open? Common system issues include a cracked pressure switch tube, a clogged inducer port, or a restricted chimney or venting run. If the manometer shows 0.60" WC but the switch remains open, the internal diaphragm has likely failed.
- Is this used for positive or negative pressure? This is a negative pressure switch, typically connected to the suction side of the inducer housing to monitor proper draft induction.
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: $15.89
-65%$15.89
$5.56Rheem-Ruud 42-101956-12 Pressure Switch
The Rheem-Ruud 42-101956-12 Pressure Switch is an essential safety component designed for precise draft monitoring in high-efficiency gas furnaces. Functioning as a -0.50" WC SPST pressure switch, this OEM furnace part ensures that the draft inducer motor is moving sufficient air through the heat exchanger before the ignition sequence begins. When the inducer establishes the required negative pressure of -0.50 inches water column, the single pole single throw (SPST) contacts close, completing the 24V circuit to the control board to initiate the hot surface igniter and gas valve operation.
For service technicians, the 42-101956-12 provides a direct OEM replacement for specific Rheem and Ruud furnace models, including the UGRC and RGRC series. It features a robust plastic housing with a single vacuum port and standard spade terminals for quick integration. Using a genuine Rheem-Ruud pressure switch is critical for maintaining the safety integrity of the system, as improper set points can lead to incomplete combustion or nuisance furnace pressure switch lockout codes (typically a 2-blink or 3-blink error on most Protech boards).
Key Benefits for HVAC Professionals:- Precise Calibration: Factory-set at -0.50" WC to ensure accurate safety limit response and prevent hazardous flue gas buildup.
- Direct OEM Compatibility: Engineered specifically for Rheem, Ruud, and WeatherKing gas furnaces, eliminating the risks associated with universal parts.
- Enhanced Reliability: Features self-cleaning contacts to resist environmental contaminants and prevent "fluttering" during high-demand cycles.
- Simple Installation: Standard configuration allows for immediate swap-out in Rheem RGRC-07M and similar induced-draft units.
- How do I test the 42-101956-12? With the furnace calling for heat and the inducer running, use a manometer to verify the negative pressure at the switch port exceeds the -0.50" WC set point. Simultaneously, check for zero ohms across the terminals to confirm the SPST switch has closed.
- What causes this switch to stay open? Common system issues include a cracked pressure switch tube, a clogged inducer port, or a restricted chimney or venting run. If the manometer shows 0.60" WC but the switch remains open, the internal diaphragm has likely failed.
- Is this used for positive or negative pressure? This is a negative pressure switch, typically connected to the suction side of the inducer housing to monitor proper draft induction.
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 Rheem-Ruud 42-101956-12 Pressure Switch is an essential safety component designed for precise draft monitoring in high-efficiency gas furnaces. Functioning as a -0.50" WC SPST pressure switch, this OEM furnace part ensures that the draft inducer motor is moving sufficient air through the heat exchanger before the ignition sequence begins. When the inducer establishes the required negative pressure of -0.50 inches water column, the single pole single throw (SPST) contacts close, completing the 24V circuit to the control board to initiate the hot surface igniter and gas valve operation.
For service technicians, the 42-101956-12 provides a direct OEM replacement for specific Rheem and Ruud furnace models, including the UGRC and RGRC series. It features a robust plastic housing with a single vacuum port and standard spade terminals for quick integration. Using a genuine Rheem-Ruud pressure switch is critical for maintaining the safety integrity of the system, as improper set points can lead to incomplete combustion or nuisance furnace pressure switch lockout codes (typically a 2-blink or 3-blink error on most Protech boards).
Key Benefits for HVAC Professionals:- Precise Calibration: Factory-set at -0.50" WC to ensure accurate safety limit response and prevent hazardous flue gas buildup.
- Direct OEM Compatibility: Engineered specifically for Rheem, Ruud, and WeatherKing gas furnaces, eliminating the risks associated with universal parts.
- Enhanced Reliability: Features self-cleaning contacts to resist environmental contaminants and prevent "fluttering" during high-demand cycles.
- Simple Installation: Standard configuration allows for immediate swap-out in Rheem RGRC-07M and similar induced-draft units.
- How do I test the 42-101956-12? With the furnace calling for heat and the inducer running, use a manometer to verify the negative pressure at the switch port exceeds the -0.50" WC set point. Simultaneously, check for zero ohms across the terminals to confirm the SPST switch has closed.
- What causes this switch to stay open? Common system issues include a cracked pressure switch tube, a clogged inducer port, or a restricted chimney or venting run. If the manometer shows 0.60" WC but the switch remains open, the internal diaphragm has likely failed.
- Is this used for positive or negative pressure? This is a negative pressure switch, typically connected to the suction side of the inducer housing to monitor proper draft induction.
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.
