Trane AFS222121 Adjustable Air Pressure Switch

Product Description

The TRANE AFS222121 is an adjustable air pressure switch designed for use in forced-air HVAC systems. Air pressure switches monitor airflow or draft conditions within a furnace or air handler, opening or closing an electrical circuit in response to pressure changes. The adjustable setpoint on this switch allows a technician to calibrate the trip point to match system requirements without replacing the component. It is typically installed by licensed HVAC technicians during equipment service, commissioning, or component replacement.

The AFS222121 is suited for residential and light commercial forced-air heating and cooling applications. Adjustable pressure switches are commonly found in gas furnaces, where they serve as a safety interlock that confirms inducer draft before allowing ignition. They may also appear in air handlers and ventilation equipment where airflow verification is required before system operation proceeds.

Key Features

• Adjustable setpoint allows field calibration to match specific system pressure requirements
• Functions as a safety interlock to verify proper airflow or draft conditions before system operation
• Suitable for forced-air furnace and air handler applications
• OEM replacement part from TRANE for direct-fit installation

Compatibility

Designed as an OEM-style replacement adjustable air pressure switch for TRANE forced-air HVAC systems. Consult the equipment service manual or TRANE parts documentation to confirm fitment for a specific model.

Installation Notes

Installation should be performed by a licensed HVAC technician. Always shut off power to the unit at the disconnect or breaker before removing or installing the pressure switch. Verify that the inducer motor and venting system are in proper working order before adjusting or replacing the switch. Follow the equipment manufacturer's service manual and applicable local codes when setting the pressure switch trip point.

Technical Specifications

• Type: Adjustable Air Pressure Switch

Standard Information

• Brand: TRANE
• Manufacturer Part Number: AFS222121