Honeywell c7400s1000 Digital Enthalpy Sensor

Product Description

The HONEYWELL c7400s1000 is a digital enthalpy sensor designed to measure both humidity and temperature for use with S-Bus compatible devices and the W7220 economizer controller. Operating at 21 volts DC, this sensor feeds real-time enthalpy data to the economizer controller, allowing the system to determine when outdoor air conditions are suitable for free cooling. It is a field-mounted sensor intended for installation by licensed HVAC technicians as part of a commercial or light-commercial economizer control strategy. The unit measures 5 inches in length, 1.5 inches in width, and 3.75 inches in height, weighing approximately 1 pound.

The c7400s1000 is used in HVAC applications where outdoor air enthalpy sensing is required to enable or disable economizer operation. It is paired with the W7220 economizer controller and communicates over the S-Bus protocol. Typical installations include rooftop units and air handling units in commercial buildings where energy codes require demand-controlled or enthalpy-based economizer lockout. This sensor supports compliance with ASHRAE 90.1 and similar energy efficiency standards that mandate enthalpy-based economizer control.

Key Features

• Measures both humidity and temperature to calculate outdoor air enthalpy
• Compatible with S-Bus communication protocol for direct integration with supported controllers
• Designed for use with the W7220 economizer controller
• Operates at 21 volts DC
• Compact form factor: 5 inches x 1.5 inches x 3.75 inches

Compatibility

Designed for use with S-Bus devices and the W7220 economizer controller, as specified by the manufacturer.

Installation Notes

Installation should be performed by a licensed HVAC technician familiar with economizer control systems and low-voltage sensor wiring. Disconnect and lock out power to the economizer controller and associated equipment before beginning any wiring work. Follow the W7220 controller wiring diagrams and applicable local codes when connecting the S-Bus communication leads. Mount the sensor in a location that accurately represents outdoor air conditions, away from exhaust outlets, direct sunlight, and other sources of heat or moisture that could skew readings.