This class serves as the third year of training in the HVAC craft. Structured as a hybrid class, a combination of on-line training and live classroom/lab training, students learn the following content: Refrigerants and Oils; Compressors; Metering Devices; Retail Refrigeration Systems; Commercial Hydronic Systems; Steam Systems; Planned Maintenance; Water Treatment; Troubleshooting Electronic Controls; Troubleshooting Oil Heating; Troubleshooting Heat Pumps; Troubleshooting Accessories. Textbook, Online Access Code, and all materials are included. Students are required to purchase current HVAC Code book for class. Computer and internet access required for hybrid class.