Daikin-McQuay 4ELN9178 Automatic Freeze Stat with 144″ Capillary

Daikin-McQuay 4ELN9178 Automatic Freeze Stat Overview

The Daikin-McQuay 4ELN9178 is an automatic freeze protection thermostat (low-limit stat) engineered for commercial HVAC air handling units and rooftop equipment. Featuring a generous 144-inch (12-foot) capillary sensing element, this freeze stat is designed to average air temperature across a wide coil face, providing reliable and accurate freeze protection even in large-scale applications.

Key Features

• Automatic reset freeze protection thermostat for commercial HVAC systems
• 144″ (12 ft) averaging capillary tube for wide coil face coverage
• Senses average air temperature across the entire sensing length — trips on any 12″ section reaching freeze threshold
• Designed for use in air handling units, rooftop units, and fan coil systems
• Automatic reset operation restores normal system function once temperature rises above setpoint
• OEM replacement part engineered to Daikin-McQuay specifications
• Durable construction for long-term reliability in demanding commercial environments

Application

The 4ELN9178 freeze stat is installed in the mixed-air or entering-air section of an air handling unit to detect dangerously low air temperatures that could freeze heating or cooling coils. When any 12″ segment of the capillary senses a temperature at or below the freeze protection setpoint, the stat trips the unit, preventing costly coil damage and system downtime.

Why Choose the Daikin-McQuay 4ELN9178?

• Genuine Daikin-McQuay OEM quality and compatibility
• Long 144″ capillary ensures comprehensive temperature averaging across large coil surfaces
• Automatic reset minimizes service interruptions once safe temperatures are restored
• Ideal for replacement or maintenance of existing Daikin-McQuay commercial HVAC equipment