Reznor 193810 Switch

The Reznor 193810 is a heavy-duty air proving switch pre-mounted in a protective enclosure, engineered specifically for Reznor HVAC systems. Designed for reliability in demanding commercial and industrial environments, this differential pressure switch acts as a primary safety mechanism to verify proper combustion airflow before allowing the ignition sequence to proceed. It serves as a direct OEM replacement for legacy part numbers including Reznor 68266 and 125133, frequently utilized in (H)SC, SC, and RPB series unit heaters. The 193810 features a 1/4" barbed connection and a normally open contact configuration that closes upon sensing the correct static pressure. By utilizing an enclosed design, the Reznor 193810 switch provides superior resistance to dust and airborne contaminants, ensuring consistent airflow monitoring and preventing nuisance shutdowns. This combustion air pressure switch kit is essential for contractors maintaining system safety compliance and peak burner efficiency in gas-fired heating equipment.

Key Benefits

• Direct OEM Compatibility: Engineered to fit Reznor (H)SC and RPB models at elevations up to 4,000 feet, replacing obsolete switches 68266 and 125133.
• Enhanced Durability: The integrated metal enclosure protects the sensitive bellows and electrical contacts from harsh mechanical room environments.
• Safe Ignition Protocol: Ensures that the venter motor creates adequate draft, preventing hazardous gas accumulation or rollout.
• Simplified Installation: Comes pre-mounted to reduce field labor time, featuring a standard 1/4-inch barb for quick pneumatic tubing attachment.
• Reliable Switching: Utilizes high-quality silver contacts to provide precise electrical continuity once the specific pressure setpoint is achieved.

Common Questions

What are the symptoms of a failing Reznor 193810 switch?
Common indicators include the heater failing to ignite despite the inducer motor running, or the control board flashing a specific pressure switch lockout code. This often points to a ruptured diaphragm or fouled contacts within the air proving switch.

Can this switch be used at high altitudes?
The Reznor 193810 is calibrated for standard installations between 0 and 4,000 feet. For applications above this elevation, a specific high-altitude pressure switch (such as the 193811) is required to account for lower air density.

Does this switch include new wiring terminals?
Yes, because Reznor updated terminal sizes in 1999 to meet ANSI/CSA standards, this kit typically includes the necessary 1/4" and 3/16" quick-connect terminals to adapt older wiring harnesses to the new switch body.

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.