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Models DRE & DVE - 52/80/120
COMMERCIAL ELECTRIC WATER HEATERS
• INSTALLATION • OPERATION • MAINTENANCE • LIMITED WARRANTY
CAUTION
TEXT PRINTED OR UNDERLINED IN RED
CONTAINS INFORMATION RELATIVE TO YOUR
A DIVISION OF A.O. SMITH CORPORATION
SAFETY. PLEASE READ THOROUGHLY BEFORE
MCBEE, SOUTH CAROLINA
ATTEMPTING ANY CONVERSION.
www.hotwater.com
PLACE THESE INSTRUCTIONS ADJACENT TO HEATER AND
NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE.
PRINTED IN U.S.A. 0906
PART NO. 196674-001
1
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Summary of Contents for A.O. Smith DRE
- Page 1 Models DRE & DVE - 52/80/120 COMMERCIAL ELECTRIC WATER HEATERS • INSTALLATION • OPERATION • MAINTENANCE • LIMITED WARRANTY CAUTION TEXT PRINTED OR UNDERLINED IN RED CONTAINS INFORMATION RELATIVE TO YOUR A DIVISION OF A.O. SMITH CORPORATION SAFETY. PLEASE READ THOROUGHLY BEFORE MCBEE, SOUTH CAROLINA ATTEMPTING ANY CONVERSION.
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Page 2: Rough-In-Dimensions
Rough-in-Dimensions Model Number DRE/DVE-52 DRE/DVE-80 DRE/DVE-120 Get to know your water heater Tank Capacity in Gallons 55 1/4 59 1/2 62 1/4 Inlet/Outlet 21 3/4 1 1/4 25 1/4 1 1/4 29 1/2 1 1/4... -
Page 3: Table Of Contents
Contents ROUGH-IN-DIMENSIONS ... GET TO KNOW YOUR WATER HEATER ... RECOVERY CAPACITY ... APPROVALS ... MODEL AND RATING PLATE ... FOREWORD ... GENRAL SAFETY INFORMATION ... INSTALLATION ... Required Ability ... General ... Location ... Waterline Connections ... Relief Devices ... -
Page 4: Model And Rating Plate
• Do not cover the instruction manual. Keep it on the side of the water heater or nearby for future reference. • Do obtain new labels from A.O. Smith for placement on the blanket directly over the existing labels. WARNING FAILURE TO FOLLOW THESE INSTRUCTIONS CAN RESULT IN SERIOUS PERSONAL INJURY OR DEATH. -
Page 5: Installation
Drain pans suitable for these heaters are available from your distributor or Product Service Division, A.O. Smith Water Heater Parts Fulfillment, 125 Southeast Parkway, Franklin, TN 37068. Water heater life depends upon water quality, water pressure and the environment in which the water heater is installed. -
Page 6: Temperature Limiting Control(S)
An unplugged 3/4" relief valve opening is provided for installing temperature and pressure relief valve. TEMPERATURE LIMITING CONTROL(S) Both the DVE and DRE model water heaters incorporate high temperature cutoffs. In the event of high temperature cutoff operation, the reason for the operation of the high temperature cutoff operation must be determined and corrected. -
Page 7: Piping Diagrams
Piping Diagrams ONE TEMPERATURE WITH CIRCULATING LOOP INSERT B VACUUM RELIEF VALVE. INSTALL PER LOCAL CODES. DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 6. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES. - Page 8 INSERT B DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 6. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES. VACUUM RELIEF VALVE.
- Page 9 INSERT B DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 6. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES. VACUUM RELIEF VALVE.
- Page 10 ONE TEMPERATURE ONE HEATER VERTICAL STORAGE TANK FORCED CIRCULATION WITHOUT BUILDING RECIRCULATION CAUTION: IF BUILDING COLD WATER SUPPLY HAS A BACK-FLOW PREVENTER, CHECK VALVE OR WATER METER WITH CHECK VALVE, PROVISIONS FOR THERMAL EXPANSION OF WATER IN THE HOT WATER SYSTEM MUST BE PROVIDED. *PIPE TO OPEN DRAIN INSTALL IN ACCORDANCE WITH ALL LOCAL CODES TWO TEMPERATURE WITH MIXING VALVE...
- Page 11 DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 6. IF INSERT B HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES.
- Page 12 DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 6. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES. INSERT B VACUUM RELIEF VALVE.
- Page 13 DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 6. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES. INSERT B VACUUM RELIEF VALVE.
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Page 14: Electrical
AN ELECTRICAL GROUND IS REQUIRED TO REDUCE RISK OF ELECTRIC SHOCK OR POSSIBLE ELECTROCUTION. water heater should be connected to a separate grounded branch circuit with overcurrent protection and disconnect switch. The water heater should be grounded in accordance with national and local codes. -
Page 15: Branch Circuit
The branch circuit wire and fuse size should be established through reference to the current version of the National Electrical Code or any other locally approved source in conjunction with the heater amperage rating. Branch circuit wires should have a temperature rating no less than 75°C. -
Page 16: Amperage Table/Overcurrent Protection
HEATER CIRCUITS - DVE MODELS The water heater's electrical components are pictured and identified on page 2. The model and rating plate illustration on page 4 identifies heater circuit ratings. The DVE model has two electrical circuits. - Page 17 DVE CONTROL CIRCUIT DIAGRAMS...
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Page 18: Power Circuit
DVE POWER CIRCUIT DIAGRAMS POWER CIRCUIT The power circuit wiring is 12 Awg. AWM or TEW type, rated 600 volts, 105°C. Power circuit fusing consists of three 30 amp class G fuses for each contactor. See wiring diagrams. Do not substitute fuses of a different rating. - Page 19 DVE POWER CIRCUIT DIAGRAMS (Continued) CONVERSION TO SINGLE PHASE When the heater is shipped for connection to a three-phase electrical service, it may be connected to a single-phase electrical service of the same voltage by: 1. Disconnect blue wires and yellow wires from terminal L3. 2.
- Page 20 The following describes the heater circuits and includes wiring diagrams. All heater circuits are designed for 60/50 hertz alternating current. The DRE circuit wiring is 12 AWG, AWM, or TEW type, rated 600 volts, 105°C. FUSING Fusing consists of two 30 amp class G fuses for each element. See wiring diagrams.
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Page 21: Power Circuit
DRE POWER CIRCUIT DIAGRAMS CONVERSION TO SINGLE PHASE When the heater is shipped for connection to a three-phase electrical service, it may be connected to a single-phase electrical service of the same voltage by: 1. Disconnect blue wires and yellow wires from terminal L3. -
Page 22: Operation
The high temperature cutoff contacts open at 190°F and must be manually reset (after a 30°F drop in water temperature). DRAINING The water heater must be drained if it is to be shut down and exposed to freezing temperatures. Maintenance and service procedures may also require draining the heater. -
Page 23: Flushing
® UN•LIME delimer. UN•LIME is a non-muriatic delimer, available from Product Service Division, A.O. Smith Water Heater Parts Fulfillment, 125 Southeast Parkway, Franklin, TN 37068. Do not use muriatic or hydrochloric acid base deliming solutions to remove lime scale from the elements. -
Page 24: Lime Scale Removal
Replacement parts may be ordered through dealers, authorized servicers, or distributors. Refer to Yellow Pages for where to call or contact the Product Service Division, A.O. Smith Water Heater Parts Fulfillment,125 Southeast Parkway, Franklin, TN 37068, 1- 800-433-2545. When ordering parts, specify complete model no., serial no., (see rating plate), quantity and name of part desired. -
Page 25: Leakage Checkpoints
Leakage Checkpoints INSTRUCTIONS: USE THIS ILLUSTRATION AS A GUIDE WHEN CHECKING FOR SOURCES OF WATER LEAKAGE. YOU OR YOUR DEALER MAY BE ABLE TO CORRECT WHAT APPEARS TO BE A PROBLEM. Drain valve leakage could be from the valve itself. Either correct the problem or replace the valve*. -
Page 26: Limited Warranty
ALL OTHER PARTS If within ONE year after initial installation of this water heater, any part or portion shall prove upon examination by the warrantor to be defective in material or workmanship, the warrantor will repair or replace such part or portion at its option. - Page 28 McBee, South Carolina 29101 Phone: 1-800-527-1953 Fax: 800-433-2515 www.hotwater.com e-mail: parts@hotwater.com...