this Marley 4506-2012-000 is specified for "All Models" within several unit heater series that utilize a 5/8-inch or standard door aperture

This comprehensive kit includes six precision-engineered electrodes

Efficient Field Service: Streamlines the maintenance workflow for HVACR technicians during critical system startups or oil changes

Environmental Precision: Supports auxiliary IAQ sensors and humidity monitoring for comprehensive indoor air quality control

and SV9502 series

Carrier HH57AC078 Enthalpy Sensor 320819-301 this Marley 4506-2012-000 is specifiedEnsure your commercial HVAC systems operate with maximum efficiency using the Carrier HH57AC078 Enthalpy Sensor. This solid state OEM replacement part is essential for managing economizer control by accurately measuring both relative humidity and temperature. This dual sensing capability allows the system to calculate total heat content (enthalpy), enabling smart decisions between utilizing outdoor air or mechanical cooling to maintain setpoint