Description
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
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