KEES, INC. Installation & Maintenance Manual DFG Series Direct Gas Fired Make-up Air Heaters Table of Contents Page # Topic 1 Description of Operation 1 Receiving the Unit 1 Positioning the Unit 1 Curbing the Unit 2 Piping the Unit 2 Wiring the Unit 3 Optional Equipment 5 Controls Description 9 Troubleshooting Guide 13 Start-up of the Unit 15 Maintenance Schedule FOR YOUR SAFETY If you smell gas: 1. Open windows. 2. Don't touch electrical switches. 3. Extinguish any open flame. 4. Immediately call your gas supplier. FOR YOUR SAFETY The use and storage of gasoline or other flammable vapors and liquids in open containers in the vicinity of this appliance is hazardous. WARNING: Improper installation, adjustment, alteration, service or maintenance can cause property damage, injury or death. Read the installation, operating and maintenance instructions thoroughly before installing or servicing this equipment.