This workbook is part two of a self-instructional course prepared for the United States Environmental Protection Agency. The student proceeds at his own pace and when questions are asked, after answering, he either turns to the next page to check his response or refers to the previously covered material. The purpose of this course is to prepare the student for the APC Training Certificate, instill in him the basics of safe boiler operation and maintenance, and help him keep the boiler system operating smoothly. (BT)