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Installation Instructions and
Use & Care Guide
Commercial Electric
Read this manual and the labels on the water heater before you install,
operate, or service it. If you have difficulty following the directions, or
aren't sure you can safely and properly do any of this work yourself:
• Call our Technical Assistance Hotline at 1-888-479-8324 We can help you with
installation, operations, troubleshooting, or maintenance. Before you call, write
down the model and serial number from the water heater's data plate.
Incorrect installation, operation, or service can damage the water heater and
property, and present risks including fire, scalding, electric shock, and explosion,
causing serious injury or death.
Table of Contents ................................... Page
Important Safety Information ............................................... 3
Getting Started ....................................................................... 6
Installation ............................................................................ 11
Troubleshooting ................................................................... 21
Maintenance ........................................................................ 24
Repair Parts .......................................................................... 28
Warranty............................................................................... 29
Notes .................................................................................... 30
Keep this manual in the pocket on heater for future reference whenever maintenance, adjustment or service is required.
May, 2021
Water Heater
• DELC-30/40/50
• DENC-30/40
• DEJC-50/66
LOW LEAD
CONTENT
100344253_2000601866_Rev_00
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Summary of Contents for A.O. Smith DELC-30
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Page 1: Table Of Contents
Installation Instructions and Use & Care Guide Commercial Electric Water Heater • DELC-30/40/50 • DENC-30/40 • DEJC-50/66 Read this manual and the labels on the water heater before you install, operate, or service it. If you have difficulty following the directions, or aren’t sure you can safely and properly do any of this work yourself:... - Page 2 COMPLETED INSTALLATION (TYPICAL) Water shut off Expansion tank Cold water water line line Electrical junction T&P relief valve Upper Element and Thermostat access ECO Reset Button (on most models) T&P discharge pipe Lower Element and Thermostat access Drain pan discharge pipe Drain valve Drain pan...
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Page 3: Important Safety Information
IMPORTANT SAFETY INFORMATION Read and follow all safety messages and instructions in Important information to keep this manual. Fill out this section and keep this manual in the pocket of the water This is the safety alert symbol. It is used to alert you to heater for reference. - Page 4 IMPORTANT SAFETY INFORMATION RISKS DURING OPERATION o reduce the risk of property For information about changing the damage, serious injury or death, factory thermostat setting(s), refer to Scalding Risk read and follow the precautions below, the “Adjusting Temperature” section in This water heater all labels on the water heater, and this manual (see page 19, step 10).
- Page 5 If there is a particular risk of scalding • Be sure the junction box cover and Water Supply Systems, ANSI Z21.22/ (for example, the elderly, children, or the access door covers are in place. CSA 4.4. The T&P Relief Valve’s relief people with disabilities) or if there These covers keep debris from pressure must not exceed the working...
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Page 6: Getting Started
DENC 30/40 TABLE 1 - ROUGH-IN DIMENSIONS Approx. Tank Capacity Models No. of Shipping Weight Dimensions Elements US Gals. Litres inches inches inches inches Lbs. DELC-30 31-5/8 21-15/16 DELC-40 33-7/8 23-7/8 DELC-50 26-1/2 26-1/8 DENC-30 39-7/8 1013 30-7/16 DENC-40 49-7/8 1267... - Page 7 • Tools to make the electrical Review all of the instructions connections (for example, before you begin work. screwdrivers, wire strippers) Improper installation can damage the water heater and • Non-Contact circuit tester to check property, and can present risks of for power (figure 2) serious injury or death.
- Page 8 GETTING STARTED Electrical switch. The water heater should be This is an example of calculating heater grounded in accordance with national amperage for both types of element and local codes. operation. From this, the branch circuit conductor and overcurrent protection BRANCH CIRCUIT sizing can be established.
- Page 9 Approvals All models are listed by Underwriters Laboratories Inc. Model and Rating DELC-30/40/50, DENC-30/40 & DEJC-50/66 Commercial Electric Water Heater Use and Care Guide • 9...
- Page 10 GETTING STARTED Thermostat Wiring Diagram A-8 CIRCUIT FOR DUAL ELEMENT HEATER 10 • Commercial Electric Water Heater Use and Care Guide...
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Page 11: Installation
INSTALLATION ✓ Follow these steps for proper Water pressure installation: increase caused by Step 1: thermal expansion ✓ Verify that you have a properly sized Verify the Thermal Expansion Tank (figure 5). We plumbing system is recommend installing an expansion tank if the property does not have equipped and up-to- one. - Page 12 INSTALLATION BACKGROUND: Water expands when Install Thermostatic Mixing Valves heated, and the increased volume (figure 7) to regulate the temperature of water must have a place to go, or of the water (for example, kitchen thermal expansion will cause large sink, bathroom sink, bath, shower).
- Page 13 Step 2: Avoid locations such as attics, WARNING! Working on an energized circuit can result in severe upper floors, or where a leak Verify that the location injury or death from electrical shock. might damage the structure or furnishings. Due to the normal is appropriate Disconnect the electrical corrosive action of water, the tank will...
- Page 14 INSTALLATION possible. If necessary, you can make Install a suitable drain pan them shorter later when you install that is piped to an adequate the new water heater. drain. Remove the old water heater. Set the water heater in place taking care not to damage the drain pan.
- Page 15 • The discharge pipe must withstand • Do not place any valve or other DO NOT CONNECT ELECTRICAL 250°F (121°C) without distortion. Use restriction between the tank and WIRING UNTIL YOU ARE only PEX, copper or CPVC pipe. Do T&P Relief Valve. Do not cap, block, INSTRUCTED TO DO SO.
- Page 16 INSTALLATION Step 6: Thermostatic Mixing Valve or other IF YOU HAVE COPPER temperature limiting device in the inlet PIPES: water supply line to limit water supply Install shutoff and inlet temperature to 120°F (49°C). If the plumbing system has copper tempering valves Solar water heating systems can supply water pipes, you can solder the...
- Page 17 NOTICE: Most water heater models Turn the cold water supply contain energy saving heat traps in the back on. inlet and outlet connections to avoid the circulation of hot water within the pipes. Do not remove the heat traps. Connect the hot water supply using 3/4 inch (19mm) NPT to the hot water outlet.
- Page 18 INSTALLATION Step 9: Make electrical connections WARNING! Working on an energized circuit can result in severe injury or death from electrical shock. NOTICE: The tank must be NOTICE: Do not turn electrical power completely empty of air and on unless you are sure all of the air full of water before connecting Figure 18 - ...
- Page 19 Step 10: WARNING! Be sure panels are secured to reduce the risk of fire and Adjusting the electric shock. Temperature Turn the electric power back With the installation steps completed, you may adjust the water heater’s Wait for the water to heat up. temperature setting if desired.
- Page 20 INSTALLATION Step 11: Operation The water heater is now ready for normal operation. To keep your water heater working safely and efficiently and extend its life, perform maintenance according to the schedule on page 24. Vacation To save energy, lower the temperature setting on the thermostat(s) if you plan to be gone for an extended time.
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Page 21: Troubleshooting
TROUBLESHOOTING WARNING! Working near an circuit’s fuses). Check the top two screws of energized circuit can result in severe the upper thermostat using a • Open the electrical junction box. injury or death from electrical shock. non-contact circuit tester and confirm that power is off (screw •... - Page 22 TROUBLESHOOTING Check/Reset Energy Cut Off replace if necessary. amount of hot water the shower or (ECO) Button. faucet delivers even though there is • The ECO was not tripped if you didn’t plenty of hot water in the tank. Always hear a click.
- Page 23 Lower heating element not working. cold water connections or the dip tube the T&P Relief Valve discharge pipe will If the lower heating element (or, more (cold water side). Melted heat traps or drip. You may be able to clear debris rarely, the lower thermostat) is not a melted dip tube can restrict the flow from the T&P Relief Valve by manually...
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Page 24: Maintenance
MAINTENANCE Routine Maintenance than trying to remove heavy lime back on unless the tank is completely deposits. full of water. Routine maintenance will help your Remove and inspect the To drain and flush the tank: water heater last longer and work anode rod (see Repair Parts better. - Page 25 Steps for Replacing the Heating replacing the anode rod as needed. If you are not comfortable replacing a Obtain new anode rods from a local heating element or thermostat yourself, Element: plumbing supplier or have a qualified have this work done by a qualified Turn the power OFF at the circuit person replace it.
- Page 26 MAINTENANCE open and the drain valve is closed. To replace the thermostat, you’ll need Open the electrical junction Allow the hot water to run full for at the following tools and supplies: box or remove the lower least three minutes to make sure the access panel on the water •...
- Page 27 T&P Relief Valve Maintenance Remove the plastic element/ thermostat cover. Open the Read and follow the operating and lower access panel on the annual maintenance instructions water heater if replacing the lower provided by the manufacturer of the thermostat. Fold back the insulation T&P Relief Valve (yellow label attached and remove the plastic element/ to T&P Relief Valve).
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Page 28: Repair Parts
LOWER THERMOSTAT W/ HI LIMIT THERMOSTAT BRACKET PERSONAL PROTECTOR LOWER ACCESS PANEL DIP TUBE POWER TERMINAL DRAIN VALVE DENC-30/40 & DEJC-50/66 DELC-30/40/50 OUTLET FOR BOTTOM ENTRY UNITS ONLY INLET FOR BOTTOM ENTRY UNITS ONLY 28 • Commercial Electric Water Heater Use and Care Guide... -
Page 29: Warranty
COMMERCIAL WATER HEATER LIMITED WARRANTY EFFECTIVE WHAT'S NOT COVERED For 3 Years, in the event of a tank leak, we will repair or, at our • Problems caused by improper: gas supply line sizing, gas type, discretion, replace the defective water heater. venting, connections, combustion air, voltage, wiring, or fusing For 1 Year, •... -
Page 30: Notes
NOTES 30 • Commercial Electric Water Heater Use and Care Guide... - Page 31 NOTES Commercial Electric Water Heater Use and Care Guide • 31...
- Page 32 Copyright © 2021, A.O. Smith. All Rights Reserved...