A.O. Smith DRE, DVE

McBee, South Carolina 29101

Phone: 1-800-527-1953 Fax: 800-433-2515

www.hotwater.com e-mail: parts@hotwater.com

Contents

Main COMMERCIAL ELECTRIC WATER HEATERS CAUTION www.hotwater.com Models DRE & DVE - 52/80/120 INSTALLATION OPERATION MAINTENANCE LIMITED WARRANTY Page Contents Recovery Rating Approvals Model and Rating Foreword PRECAUTIONS GROUNDING INSTRUCTIONS HYDROGEN GAS (FLAMMABLE) General Safety Information Installation REQUIRED ABILITY LOCATION WATER LINE CONNECTIONS RELIEF DEVICES TEMPERATURE LIMITING CONTROL(S) DVE Models DRE Models TEMPERATURE REGULATION Piping Diagrams ONE TEMPERATURE WITH CIRCULATING LOOP Page Page Page Page Page Page MANIFOLD KITS TWO HEATERS THREE HEATERS FOUR HEATERS Electrical BRANCH CIRCUIT AMPERAGE TABLE/OVERCURRENT PROTECTION HEATER CIRCUITS - DVE MODELS CONTROL CIRCUIT - DVE MODELS TRANSFORMER CONNECTION TABLES Page Page DVE POWER CIRCUIT DIAGRAMS (Continued) Page DRE POWER CIRCUIT DIAGRAMS Operation FILLING STARTUP HIGH TEMPERATURE LIMITING DEVICE DRAINING FLUSHING SEDIMENT REMOVAL LIME SCALE REMOVAL CHECKLIST IF YOU CANNOT IDENTIFY OR CORRECT THE SOURCE OF MALFUNCTION REPLACEMENT PARTS Leakage Checkpoints Limited Warranty