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A.O. Smith dre-52 - User Manual

A.O. Smith dre-52
176 pages
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0313851 / R1.0
DRE
Electric Commercial Water Heater
Electrische Commerciele Boiler
Chauffe-eau Tertiaire Électrique
DRE 52/80
Installation, User and Service Manual
Installatie-, Gebruikers- en Servicehandleiding
Manuel d'installation, d'utilisation et d'entretien
1522 / ENNLFR

Table of Contents

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Questions and Answers

  • B
    Brenda StewartAug 16, 2025
    Why is there no hot water in my A.O. Smith dre-52?
    • W
      wlarsonAug 16, 2025
      There could be several reasons for insufficient or no hot water from your A.O. Smith Water Heater: * The water heater might be off. Solution: Turn on the water heater. * The temperature may be set too low. Solution: Increase the setting on the regulating thermostats. * There may be no supply voltage. Solution: Ensure the isolator is in the ON position, there is power on the isolator, and power to the electrical connector block (400 VAC (-15%, +10%)). * The hot water supply may be depleted. Solution: Reduce hot water consumption and wait for the water heater to reheat. * A safety device may be activated. Solution: Ensure the voltage between the heating element connections is 230VAC (-15%, +10%).
  • B
    Brett BurgessAug 19, 2025
    What to do if my A.O. Smith dre-52 Water Heater is leaking?
    • K
      Kevin SilvaAug 19, 2025
      If your A.O. Smith Water Heater is leaking, the cause could be: * A leak from a threaded water connection. Suggested solution: Tighten the threaded connection. * A leak from another nearby water heater or pipe segment. Suggested solution: Trace the leakage. * A leak from the water heater tank. Suggested solution: Contact the supplier of your water heater.
  • C
    Caitlin ChungAug 22, 2025
    Why A.O. Smith Water Heater has no hot water?
    • T
      Tammy BurnsAug 22, 2025
      If your A.O. Smith Water Heater isn't producing hot water, it could be due to a hot water supply valve being turned off. If you have Surface Mount Control Models, check the thermostat/ECO controls. For Electronic Control Models, verify the Operating Set Point and Differential Set Points. Also, for Electronic Control Models, make sure both enable/disable circuits at the CCB’s J7 plug/socket connection are closed circuits.
  • C
    Charles StevensAug 28, 2025
    What to do if the earth leakage circuit breaker is out on my A.O. Smith dre-52 Water Heater?
    • M
      Maria Bonilla MDAug 28, 2025
      If the earth leakage circuit breaker is out for your A.O. Smith Water Heater, it could be due to: * Not enough water in the tank. Solution: Ensure the water heater is filled with water. * One of the heating elements is defective. Solution: Measure the resistance value between each heating element connection and the outside of the tank (it should be infinite) to determine which element is defective.
  • B
    Bethany KaiserAug 31, 2025
    What to do if A.O. Smith dre-52 trips breaker?
    • D
      Daniel SheppardAug 31, 2025
      If your A.O. Smith Water Heater is tripping the breaker, ensure that the power supply breaker/fusing to the water heater meets the minimum required fuse/wire/breaker sizing, referring to the voltage and amperage listed on the water heater rating plate. Also, verify that the internal power supply phase wiring is configured correctly. Check for any pinched or shorted wiring, whether it's internal or in the power supply wiring.
  • J
    Jessica DeckerSep 3, 2025
    What to do if A.O. Smith dre-52 Water Heater shows 'No Current Detected'?
    • T
      Timothy CarrSep 3, 2025
      If your A.O. Smith Water Heater displays a “No Current Detected” alert, first ensure the power supply to the water heater matches the voltage listed on the rating plate. For 3-phase models, check for a dead leg of power. Also, check the power circuit fuses, heating elements, and contactors. Inspect the power circuit wiring to heating elements from the Power Distribution Block, to fuse blocks, to contactors, to heating elements, referring to the wiring diagram and Contactor Configuration illustration. Correct any miswiring and repair or replace damaged wiring as needed. Check the Element Sensor J12, J13, J14 plug/socket connections at the CCB for wear or damage, ensuring they are properly connected. Finally, check the Element Sensors themselves and replace any that are defective.
  • S
    Shirley GrahamSep 6, 2025
    What causes 'Energy Cut Out (ECO)' fault in A.O. Smith dre-52?
    • J
      Julie DominguezSep 6, 2025
      If your A.O. Smith Water Heater is showing an 'Energy Cut Out (ECO)' fault, check the J5 plug/socket connections at the CCB to ensure they are properly connected. Check the ECO continuity and for 120 VAC to and from the ECO. Replace the Immersion Temperature Probe if the ECO switch contacts remain open at normal operating temperatures. Also, inspect the water system piping to ensure no external heat sources are adding heat to the water inside the water heater.
  • J
    Jennifer MorenoSep 9, 2025
    What does 'Temp Probe Short' mean on A.O. Smith dre-52?
    • J
      jeannehutchinsonSep 9, 2025
      If your A.O. Smith Water Heater is displaying a “Temp Probe Short” fault, check for pinched or shorted wires between the J5 plug/socket connection on the CCB and the Immersion Temperature Probe. Repair or replace any damaged wiring. Also, check the resistance of the temperature sensor inside the Immersion Temperature Probe; replace the probe if the measured resistance is below 390 ohms.
  • T
    Todd HughesSep 12, 2025
    How to resolve 'Temp Probe Open' fault on A.O. Smith Water Heater?
    • M
      Mary AlvarezSep 12, 2025
      If your A.O. Smith Water Heater is showing a 'Temp Probe Open' fault, check the J5 plug/socket connections at the CCB to ensure they are properly connected. Check the resistance of the temperature sensor inside the Immersion Temperature Probe. Also, check for pinched or broken wiring between the Immersion Temperature Probe and the J5 plug/socket connection on the CCB; repair or replace damaged wiring as necessary.
  • Q
    qbarnesNov 24, 2025
    Why A.O. Smith dre-52 not enough hot water?
    • S
      Samantha RobbinsNov 24, 2025
      If you're not getting enough hot water from your A.O. Smith Water Heater, it might be undersized. If you have Surface Mount Control Models, check the thermostat/ECO controls. For Electronic Control Models, verify the Operating Set Point and Differential Set Points. Also, for Electronic Control Models ensure the water heater is not in the Economy Mode during peak demand periods and ensure the time is set correctly (daylight savings etc). Ensure the power supply matches the listed voltage on the water heater rating plate. Check for a water supply piping leak or restriction, such as lime/scale or a partially closed valve. Check Contactors on Electronic Control Models. Check both enable/disable circuits at the CCB’s J7 socket on Electronic Control Models. If either/both circuits are being used...

Summary

User part

Operation

Explains how to operate the water heater, including modes.

Use

Covers turning the water heater on and off.

Installation, Maintenance and Service part

Safety

Provides safety instructions for installation and maintenance.

Installation

Details the conditions and procedures for installing the water heater.

Maintenance

Outlines the required maintenance tasks for the water heater.

Troubleshooting

Provides solutions for common issues and errors.

Appendices

Technical details DRE 80

Technical specifications and data for DRE 80 models.

Technical details DRE 52

Dimensions and Connections

Electrical wiring diagram

A.O. Smith dre-52 Specifications

General IconGeneral
BrandA.O. Smith
ModelDRE-52
Capacity50 gallons
Power SourceElectric
Voltage240V
Wattage4500W
TypeElectric
Heating ElementDual Element
Warranty6 years

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