Lochinvar & A.O. Smith 100327314 Pressure Switch

The Lochinvar & A.O. Smith 100327314 Pressure Switch is a critical safety component designed for high-performance HVAC system diagnostics and forced-draft combustion control. As a technical professional, you know that maintaining precise pressure differential is non-negotiable for safe burner operation. The 100327314 serves as the direct replacement part for legacy models 100166196 and PRS2705. This air pressure switch is engineered to sense the static pressure produced by the combustion blower, ensuring the exhaust flue is clear and the fan is moving sufficient air before the gas valve is energized. Whether you are performing a furnace repair or a boiler replacement, using an OEM heating system repair component like this ensures the unit operates within its factory-calibrated specifications. Built for durability in demanding environments, this switch provides the reliable "make/break" electrical contact required to prevent code-based lockouts and intermittent ignition failures in Lochinvar and A.O. Smith commercial or residential assemblies.

• Exact Compatibility: Engineered as a drop-in replacement part for 100166196 and PRS2705, eliminating the need for mounting modifications.
• Safety Integrity: Acts as a primary limit to prevent boiler operation during blocked vent or blower failure conditions.
• Rugged Construction: Designed to withstand the high-cycle demands of industrial-grade HVAC services without contact fatigue.
• Standardized Installation: Features standard spade terminals and pressure ports for rapid field installation during emergency HVAC repair.

What causes a pressure switch open error code?
An open circuit typically indicates a blocked flue, disconnected pressure tubing, or a failing combustion blower. If the fan is running but the Lochinvar 100327314 does not close, verify for obstructions in the venting before replacing the switch.

Can I use this switch for other brands?
While many switches look similar, this unit is calibrated for specific WC (Water Column) setpoints required by A.O. Smith and Lochinvar. Always verify the part number against your technical manual to ensure proper HVAC troubleshooting outcomes.

How do I test if the pressure switch is functional?
Technicians should use a manometer to verify the draft pressure meets the switch's rating and a multimeter to check for continuity across the terminals when the inducer is at full speed.

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.