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Light Duty Commercial Electric
Water Heaters
Use & Care Manual
With Installation Instructions for the Installer
Double Element Models,
75, 85, 105 Gallon
The purpose of this manual is twofold:
one, to provide the installer with the basic
directions and recommendations for the proper
installation and adjustment of the water heater;
and two, for the owner–operator, to explain
the features, operation, safety precautions,
maintenance and troubleshooting of the water
heater. This manual also includes a parts list.
It is imperative that all persons who are
expected to install, operate or adjust this
water heater read the instructions carefully
so they may understand how to perform
these operations. If you do not understand
these instructions or any terms within it, seek
professional advice.
Any questions regarding the operation,
maintenance, service or warranty of this
water heater should be directed to the seller
from whom it was purchased. If additional
information is required, refer to the warranty.
Do not destroy this manual. Please read
carefully and keep in a safe place for future
reference.
Recognize this symbol as an
!
indication of Important Safety
Information!
AP17946-3 Rev. 4
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Table of Contents
Related Manuals for Rheem MHD75245
Summary of Contents for Rheem MHD75245
- Page 1 Use & Care Manual With Installation Instructions for the Installer Light Duty Commercial Electric Water Heaters Double Element Models, 75, 85, 105 Gallon The purpose of this manual is twofold: one, to provide the installer with the basic directions and recommendations for the proper installation and adjustment of the water heater;...
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Page 2: Table Of Contents
FOR YOUR RECORDS Safety Information Safety Precautions ..3, 4 Write the model, serial numbers, and installation details on the back cover of the manual. This information is located on the rating plate (silver label) on the unit. - Page 3 IMPORTANT SAFETY INFORMATION. READ ALL INSTRUCTIONS BEFORE USING. DANGER! WATER TEMPERATURE SETTING Safety and energy conservation are factors to be considered when selecting the water temperature setting of water heater’s thermostat. Water temperatures above 125°F (51°C) can cause severe burns or death from scalding. This water heater is capable of supplying outlet water temperature greater than 180°...
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Page 4: Safety Precautions
IMPORTANT SAFETY INFORMATION. READ ALL INSTRUCTIONS BEFORE USING. WARNING! For your safety, the information in this manual must be followed to minimize the risk of fire or explosion, electric shock, or to prevent property damage, personal injury, or loss of life. -
Page 5: Location
Installing the water heater. Local Installation Regulations This water heater must be installed in be weather sealed to the floor, a raised accordance with these instructions, local base, or on a shelf so that seepage cannot codes, utility codes, utility company accumulate under it;... - Page 6 Installing the water heater. Thermal Expansion Determine if a check valve exists in the and system piping. This rapid pressure inlet water line. Check with your local increase can quickly reach the safety water utility. It may have been installed setting of the relief valve, causing it in the cold water line as a separate back to operate during each heating cycle.
- Page 7 A new combination temperature and pressure relief valve, complying with the Standard for Relief Valves for Hot Water Supply Systems, ANSI Z21.22, is supplied and must be installed in the opening provided and marked for the purpose on the water heater. No valve of any type should be installed between the relief valve and the tank.
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Page 8: Water Connections
Installing the water heater. Water Supply Connections NOTICE: DO NOT Refer to the illustration on the The cold water connection and the attempt to turn any fitting next page for suggested typical temperature and pressure relief connected to the water installation. - Page 9 Typical Installation Support the relief valve drain pipe using metal strapping or wire fastened to the structure Pre-solder 12" minimum overhead Cold Inlet Shut stub pipes before installing to unit. Temperature & Pressure Hot Water Outlet Relief Valve Heat Trap 6" Minimum Seal Ring (Inside nut)
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Page 10: Electrical Connections
Installing the water heater. Electrical Connections DO NOT turn on the electrical A separate branch circuit with copper The branch circuit wiring should include supply or operate this water either: conductors, over current protective device heater unless it is completely full and suitable disconnecting means must be Metallic conduit or metallic of water. -
Page 11: Wiring Diagram
Branch Circuit Sizing and Wire Size Guide Total Water Recommended Over Current Wire Size AWG Based on N.E.C. Single Phase Heater Wattage Protection Copper (fuse or circuit Table 310-16 (75°C) breaker amperage rating) Wiring 240V 240V 3,000 3,800 4,500 DANGER: Elements should only be replaced with an element of the same power rating that was factory installed, and corresponds to the rating label on the unit. - Page 12 Installing the water heater. Insulation Blankets Insulation blankets, available to the CAUTION: If local codes require the WARNING: If local general public, for external use on electric application of an external insulation codes require external water heaters are not necessary. The blanket to this water heater, pay careful application of insulation purpose of an insulation blanket is to...
- Page 13 Installation Checklist A. Water Heater Location Close to area of heated water demand. ❑ Indoors and protected from freezing ❑ temperatures. Area free of flammable vapors. ❑ Provisions made to protect area from water ❑ damage. Sufficient room to service heater. ❑...
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Page 14: Operating Instructions
Operating the water heater. Safety Precautions DO turn off power to water heater if If there is any difficulty in it has been subjected to over heating, understanding or following the fire, flood, physical damage. Operating Instructions or the Care and Cleaning section, it is DO NOT turn on water heater unless recommended that a qualified person it is filled with water. - Page 15 If adjustment is necessary… NOTICE: DO NOT use this appliance if any part WARNING: If the water heater has been has been under water. Immediately call a qualified subjected to fire, flood, or physical damage, turn off installer or service agency to replace a flooded water power to water heater, and DO NOT operate the heater.
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Page 16: Care And Cleaning
Care and cleaning of the water heater. Draining the Water Heater NOTICE: Additional Lift open the handle on the relief Shut off power to the water heater. instructions for draining valve, and leave open. (top center Open a hot water faucet nearest the the unit are located on the fitting on water heater) (some water water heater. -
Page 17: Troubleshooting Tips
Before You Call For Service… Troubleshooting Tips Save time and money! Review the chart on this page first and you may not need to call for service. Problem Possible Causes What to Do Rumbling noise Water conditions in your location Remove and clean the heating elements. -
Page 18: Parts List
Replacement Parts. Key No. Description Dip Tube Grommet, Large Grommet, Small Seal Ring, Large Seal Ring, Small Vacuum Valve Assembly Temperature and Pressure Relief Valve Knock-Out Bracket Screw, #8 x 3/4" Junction Box Cover Screw #8-16 x 5/8" Upper Thermostat Upper Protector Screw, #10-16 x 5/8"... -
Page 19: Replacement Parts
Replacement Parts. 75 - 85 - 105 gallon models. 16 15... -
Page 20: Element Replacement
Element Replacement Instructions 1. Turn off power to the unit. the unit are clean. Brush debris off of threads with a toothbrush if needed. DANGER: Make certain power to the water heater is “OFF” NOTICE: The elements are unique before removing any jacket access to the upper and lower port. -
Page 21: Warranty
EXCLUSIVE WARRANTY – LIMITATION OF LIABILITY This Limited Warranty is the only Warranty for this unit given by Rheem Sales Co. Inc., a subsidiary of Rheem Manufacturing Company. No one is authorized to make any other warranties on our behalf. ANY IMPLIED WARRANTIES, INCLUDING MERCHANTABILITY, OR FITNESS FOR A PARTICULAR PURPOSE, SHALL NOT EXTEND BEYOND THE APPLICABLE WARRANTY PERIODS SPECIFIED PREVIOUSLY. - Page 22 Limited Warranty (with the full Applicable Warranty Period) for the replacement new water heater. Rheem Sales Co. Inc. reserves the right to inspect, or require the return of, the failed water heater or the defective component part(s).
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Page 23: How To Register
Plumber / Mechanical Contractor – Installer Information Name Address Telephone Number Water Heater Information Model Number Serial Number Date of Installation How to Register You Product: Step 1: Step 2: Go to www.rheem.com/warranty 1. Click on the Water Heater icon to begin. Click Start Registration... - Page 24 How to Register Your Product: Step 3: Step 5: 1. Enter the fields on the screen 1. Review confirmation page and make any nec- essary edits. Once verified click Finish. • Warranty Type choices are • Standard Notice the disclaimer at the bottom that explains •...
- Page 25 NOTES:...
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Page 28: If You Need Service
Date of original installation and dates any service work was performed. e. Details of the problems as you can best describe them. f. List of people, with dates, who have been contacted regarding your problem. Additional service information can be found at www.rheem.com.