Breadcrumb Home Air Conditioning & Refrigeration Technology ACR 119 ACR 119: FUNDAMENTALS OF GAS HEATING SYSTEMS Download as PDF Class Program Air Conditioning & Refrigeration Technology Credits 3 Lecture Hours 1 Lab Hours 4 This course provides instruction on general service and installation for common gas furnace system components. Upon completion, students will be able to install and service gas furnaces in a wide range of applications.