the 006511F modulating valve provides variable gas flow control

High-Accuracy Sensing: The 6-foot capillary and liquid-filled bulb ensure the Johnson Controls A19AAA-40 reacts quickly to thermal changes

The 7-inch insert length is specific to the unit's airflow pattern

Direct Compatibility: Engineered as an exact functional equivalent to 18J2801 for seamless field installation

If the fan side drops below tolerance

Carrier HH11AZ200 Vent Switch 340155-7024 the 006511F modulating valve providesThe Carrier HH11AZ200 Vent Switch is a critical OEM replacement safety component designed to monitor airflow and temperature within the burner box of select Carrier, Bryant, and Payne furnaces. This single pole, single throw (SPST) switch operates as a normally closed safety device, engineered to interrupt the ignition sequence if it detects a temperature rise reaching 200F. Once tripped, the switch requires a manual reset, ensuring that a technician