Lennox 38M78 Ambient Switch 318518-761 while the discharge valve utilizes

while the discharge valve utilizes a 1 3/4-12 UNC connection to ensure proper torque and sealing

Reduced Inventory: One universal blank thermal chart replaces dozens of specific pre-printed ranges

maintaining the integrity of the burner manifold

Optimized for Propane: Specifically calibrated for LP gas heating systems with a fixed 10" WC pressure setting for consistent burner performance

This specific unit features a 27-inch capillary tube for flexible vapor-filled sensing and comes with a break-off shaft and dial knob for rapid field adaptation to various OEM mounting configurations

Lennox 38M78 Ambient Switch 318518-761 while the discharge valve utilizesThis Lennox 38M78 Ambient Switch is a critical pressure actuated component designed for head pressure control in low ambient cooling applications. Engineered for precision, this low ambient pressure switch ensures reliable operation of your HVACR system when outdoor temperatures drop, preventing compressor slugging and maintaining the necessary pressure differential for efficient thermal transfer. The Lennox 38M7801 features a specific cut in point of