Ao Smith 100112659 Pressure Switch 0.37 Inches Wc

Product Description

The AO SMITH 100112659 is a replacement pressure switch rated at 0.37 inches water column (WC), designed for use in water heater systems. Pressure switches in this application monitor combustion air flow or venting conditions and signal the control circuit to allow or prevent burner operation. When the switch detects inadequate draft or a blocked vent, it interrupts the ignition sequence to prevent unsafe operation. This is a direct OEM-style replacement part intended for installation by licensed plumbing or HVAC technicians familiar with gas appliance service procedures.

This pressure switch is suited for residential gas water heater installations where the control system requires verification of proper venting before allowing the burner to fire. It is typically found in power-vent or induced-draft water heater configurations. Technicians replacing a faulty or out-of-spec switch should verify the setpoint matches the original equipment requirement before installation. The 0.37 inches WC rating is the critical specification to match to the original unit.

Key Features

• Rated at 0.37 inches water column (WC) setpoint for precise draft verification
• OEM-style replacement part for AO SMITH water heater systems
• Monitors venting or combustion air flow to protect burner operation
• Interrupts ignition sequence when adequate draft is not confirmed

Compatibility

Designed as an OEM-style replacement pressure switch for AO SMITH gas water heater systems requiring a 0.37 inches WC rated switch. Consult the unit service manual or rating label to confirm this setpoint matches the original installed switch before ordering.

Installation Notes

Installation should be performed by a licensed plumber or gas appliance technician. Shut off gas supply and disconnect power to the water heater before beginning any service work. Verify wiring connections are secure and that vent tubing attached to the switch is free of cracks, blockages, or kinks before restoring power. Follow all applicable local codes and the manufacturer service documentation when replacing pressure switch components.

Technical Specifications

• Setpoint: 0.37 inches WC
• Part Type: Replacement Part

Standard Information

• Brand: AO SMITH
• Manufacturer Part Number: 100112659