Rheem Gladiator User manual

Water Heaters

Electric Residential

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 section on

“If you need service.”

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!

With Electronic Control

LISTED

786H

AP20070

Use & Care Manual

With Installation Instructions for the Installer

FOR YOUR RECORDS

Write the model and serial numbers here:

You can find them on a label on the appliance.

Staple sales slip or cancelled check here.

Proof of the original purchase date is needed to obtain service

under the warranty.

Inside you will find many helpful hints on how to use and

maintain your water heater properly. Just a little preventive care

on your part can save you a great deal of time and money over

the life of your water heater.

You’ll find many answers to common problems in the Before

You Call For Service section. If you review our chart of

Troubleshooting Tips first, you may not need to call for service at

all.

READ THIS MANUAL

Your safety and the safety of others are very important. There

are many important safety messages in this manual and on your

appliance. Always read and obey all safety messages.

!This is the safety alert symbol. Recognize this symbol

as an indication of Important Safety Information!

This symbol alerts you to potential hazards that can

kill or hurt you and others.

All safety messages will follow the safety alert symbol and

either the word “DANGER”, “WARNING”, “CAUTION” or

“NOTICE”.

These words mean:

DANGER An imminently hazardous situation

that will result in death or serious

injury.

WARNING A potentially hazardous situation that

could result in death or serious injury

and/or damage to property.

!CAUTION A potentially hazardous situation that

may result in minor or moderate

injury.

NOTICE:

Attention is called to observe a

specified procedure or maintain

a specific condition.

READ THE SAFETY INFORMATION

Care and Cleaning

Draining ................ 20

Maintenance............. 20

Extended Shut-Down ..... 21

Safety Information

Safety Precautions ....... 3, 4

Installation Instructions

Location ................. 5

Water Connections ........ 6

Electrical Connections. . . . . . 8

Operating Instructions

Safety Controls .......... 12

Water Temperature ........13

Electronic Control

Operation . . . . . . . . . . 14 - 17

Setup Wi-Fi ..............18

Troubleshooting Tips

Before You Call

For Service.............. 22

Local Mode ............. 23

Customer Service

Parts List................ 24

Wiring Diagram......... 26

If You Need

Service ................. 28

Time/Temperature Relationship in Scalds

Temperature Time To Produce a Serious Burn

120°F More than 5 minutes

125°F 1½ to 2 minutes

130°F About 30 seconds

135°F About 10 seconds

140°F Less than 5 seconds

145°F Less than 3 seconds

150°F About 1½ seconds

155°F About 1 second

Table courtesy of Shriners Burn Institute

The chart shown above may be used as a guide

in determining the proper water temperature for your

home.

DANGER: Households with small children, disabled,

or elderly persons may require a 120°F or lower thermostat

setting to prevent contact with “HOT” water.

The temperature of the water in the heater is

regulated by the electronic control and surface

mounted temperature sensors.

DO NOT attempt to set the temperature by

removing the electronic control or lower access

panel. See the electronic control operation section

of this manual.

DANGER: Hotter water increases the potential for

Hot Water SCALDS.

DANGER

HOT

Water temperature over 125°F can

cause severe burns instantly or

death from scalds.

Children, disabled and elderly are

at highest risk of being scalded.

See instruction manual before

setting temperature at water

heater.

Feel water before bathing or

showering.

Temperature limiting valves are

available, see manual.

BURN

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 can cause severe burns or death from scalding. Be sure to read and

follow the warnings outlined on the label pictured below. This label is also located

on the water heater near the thermostat access panel.

NOTICE: Mixing valves are recommended for reducing

point of use water temperature by mixing hot and

cold water in branch water lines. It is recommended

that a mixing valve complying with the Standard for

Temperature Actuated Mixing Valves for Hot Water

Distribution Systems, ASSE 1017 be installed. See page

13 for more details and contact a licensed plumber or the

local plumbing authority for further information.

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.

Be sure to read and understand the entire Use and Care Manual before attempting

to install or operate this water heater. It may save you time and cost. Pay particular

attention to the Safety Instructions. Failure to follow these warnings could result in

serious bodily injury or death. Should you have problems understanding the instructions

in this manual, or have any questions, STOP, and get help from a qualified service

technician, or the local electric utility.

FOR INSTALLATIONS IN THE STATE OF CALIFORNIA

California Law requires that residential water heaters must be braced, anchored or

strapped to resist falling or horizontal displacement due to earthquake motions. For

residential water heaters up to 52 gallon capacity, a brochure with generic earthquake

bracing instructions can be obtained from: Office of the State Architect, 400 P Street,

Sacramento, CA 95814 or you may call 916-324-5315 or ask a water heater dealer.

However, applicable local codes shall govern installation. For residential water heaters

of a capacity greater than 52 gallons, consult the local building jurisdiction for acceptable

bracing procedures.

READ AND FOLLOW THIS SAFETY INFORMATION

CAREFULLY.

SAVE THESE INSTRUCTIONS

Have the installer show you the location of the circuit breaker and how to shut it off if

necessary. Turn off the circuit breaker if the water heater has been subjected to overheating,

fire, flood, physical damage or if the ECO fails to shut off.

●Read this manual entirely before installing

or operating the water heater.

●Use this appliance only for its intended

purpose as described in this Use and Care

Manual.

●Be sure your appliance is properly installed

in accordance with local codes and the

provided installation instructions.

●DO NOT attempt to repair or replace

any part of your water heater unless it is

specifically recommended in this manual.

All other servicing should be referred to a

qualified technician.

SAFETY PRECAUTIONS

Installing the water heater.

The location chosen for the water heater must take into consideration the following:

Local Installation Regulations

This water heater must be installed in

accordance with these instructions, local

codes, utility codes, utility company

requirements or, in the absence of local

codes, the latest edition of the National

Electrical Code. It is available from some

local libraries or can be purchased from

the National Fire Protection Association,

Batterymarch Park, Quincy, MA 02269 as

booklet ANSI/NFPA 70.

Location

Locate the water heater in a clean dry area

as near as practical to the area of greatest

heated water demand. Long uninsulated hot

water lines can waste energy and water.

Place the water heater in such a manner

that the upper electronic control and the

lower access panels can be removed to

permit inspection and servicing such as

removal of elements or checking controls.

The water heater and water lines should be

protected from freezing temperatures.

DO NOT install the water heater in

outdoor, unprotected areas.

Make certain the floor underneath

the water heater is strong enough to

sufficiently support the weight of the

water heater once it is filled with water.

CAUTION: The water heater should

not be located in an area where leakage

of the tank or connections will result

in damage to the area adjacent to it or

to lower floors of the structure. Where

such areas cannot be avoided, it is

recommended that a suitable catch pan,

adequately drained, be installed under

the water heater.

This water heater is supplied with a water

detection system. It is recommended that

the water heater be placed in a suitable

catch pan. See water sensor section for

further information.

A—Diameter of water

heater plus 2″min.

B—Maximum 2″

NOTICE: Auxiliary catch pan MUST conform to local codes.

Catch Pan Kits are available from the store where the water heater was purchased, or

any water heater distributor.

ATo open drain, line

should be at least 3/4″ID

and pitched for proper

drainage.

Inspect Shipment

Inspect the water heater for possible

damage. Check the markings on the rating

plate of the water heater to be certain the

power supply corresponds to the water

heater requirements.

NOTICE: DO NOT install

the water heater in attics

where the temperature

may exceed 150°F.

Installing the water heater

Typical Installation

Thermal Expansion

Determine if a check valve exists in the

inlet water line. Check with your local

water utility. It may have been installed in

the cold water line as a separate back flow

preventer, or it may be part of a pressure

reducing valve, water meter or water

softener. A check valve located in the cold

water inlet line can cause what is referred

to as a “closed water system”. A cold

water inlet line with no check valve or back

flow prevention device is referred to as an

“open” water system.

As water is heated, it expands in volume

and creates an increase in the pressure

within the water system. This action is

referred to as “thermal expansion”. In

an “open” water system, expanding water

which exceeds the capacity of the water

heater flows back into the city main where

the pressure is easily dissipated.

A “closed water system”, however,

prevents the expanding water from flowing

back into the main supply line, and the

result of “thermal expansion” can create

a rapid and dangerous pressure increase

in the water heater and system piping.

This rapid pressure increase can quickly

reach the safety setting of the relief

valve, causing it to operate during each

heating cycle. Thermal expansion, and the

resulting rapid and repeated expansion

and contraction of components in the

water heater and piping system can cause

premature failure of the relief valve, and

possibly the heater itself. Replacing the

relief valve will not correct the problem!

The suggested method of controlling

thermal expansion is to install an expansion

tank in the cold water line between the

water heater and the check valve (refer

to the illustration below). The expansion

tank is designed with an air cushion built

in that compresses as the system pressure

increases, thereby relieving the over

pressure condition and eliminating the

repeated operation of the relief valve. Other

methods of controlling thermal expansion

are also available. Contact your installing

contractor, water supplier or plumbing

inspector for additional information

regarding this subject.

NOTICE: DO NOT apply

heat to the HOT or COLD

water connections. If sweat

connections are used, sweat

tubing to adapter before

fitting adapter to the water

connections on heater.

Any heat applied to the

water supply fittings will

permanently damage the

dip tube and/or heat traps.

Water Supply Connections

Refer to the illustration below for

suggested typical installation. The

installation of unions or flexible copper

connectors is recommended on the hot

and cold water connections so that the

water heater may be easily disconnected

for servicing if necessary. The HOT and

COLD water connections are clearly

marked and are 3/4″NPT on all models.

Install a shut-off valve in the cold water

line near the water heater.

Vacuum Relief Valve

(Not Supplied)

If required, install per local codes

and valve manufacturer’s

instructions.

Heat trap

6" minimum

Auxiliary catch pan

2" maximum

Drain Valve

6" air gap

Relief valve discharge line to

suitable open drain

Thermal

expansion tank

(if required)

Heat trap

6" minimum

To cold water

supply

Hot water outlet

to xture

Shutoff valve

Electronic Control

Lower Access Panel

Electrical junction box

(use only copper conductors)

Shutoff

valve

Anode

Union

Temperature

Pressure relief

valve

To electric

distribution panel

WARNING: The pressure

rating of the relief valve must

not exceed 150 PSI, the

maximum working pressure

of the water heater as

marked on the rating plate.

A new combination temperature and pressure relief valve, complying with the Standard for Relief

Valves and Automatic Gas Shut-Off Devices 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. Local codes shall govern the

installation of relief valves.

Relief Valve

The BTUH rating of the relief valve must

not be less than the input rating of the

water heater as indicated on the rating

label located on the front of the heater

(1 watt=3.412 BTUH).

Connect the outlet of the relief valve

to a suitable open drain so that the

discharge water cannot contact live

electrical parts or persons and to eliminate

potential water damage.

Piping used should be of a type approved

for hot water distribution. The discharge

line must be no smaller than the outlet of

the valve and must pitch downward from

the valve to allow complete drainage (by

gravity) of the relief valve and discharge

line. The end of the discharge line should

not be threaded or concealed and should

be protected from freezing. No valve of

any type, restriction or reducer coupling

should be installed in the discharge line.

To Fill the Water Heater

Make certain the drain valve is completely

closed.

Open the shut-off valve in the cold water

supply line.

Open each hot water faucet slowly to

allow the air to vent from the water

heater and piping.

A steady flow of water from the hot water

faucet(s) indicates a full water heater.

WARNING: The tank

must be full of water before

heater is turned on. The

water heater warranty does

not cover damage or failure

resulting from operation

with an empty or partially

empty tank.

Condensation

Condensation can form on the tank when

it is first filled with water. Condensation

might also occur with a heavy water draw

and very cold inlet water temperature.

This condition is not unusual, and will

disappear after the water becomes heated.

If, however, the condensation continues,

examine the piping and fittings for

possible leaks.

Installing the water heater

NOTICE: This guide recommends minimum branch circuit sizing and wire size based on National Electric Code.

Refer to wiring diagrams in this manual for field wiring connections.

Branch Circuit Sizing and Wire Size Guide

CAUTION: The presence

of water in the piping

and water heater does

not provide sufficient

conduction for a ground.

Non-metallic piping,

dielectric unions, flexible

connectors etc. can cause

the water heater to be

electrically isolated.

Electrical Connections

A separate branch circuit with copper

conductors, overcurrent protective device

and suitable disconnecting means must be

provided by a qualified electrician.

All wiring must conform to local codes or

latest edition of National Electrical Code

ANSI/NFPA 70.

The water heater is completely wired to

the junction box inside jacket at the top

front of the water heater. An opening for

1/2″or 3/4″electrical fitting is provided

for field wiring connections.

The voltage requirements and wattage

load for the water heater are specified

on the rating plate on the front of the

water heater.

The branch circuit wiring should include either:

Metallic conduit or metallic sheathed

cable approved for use as a

grounding conductor and installed

with fittings approved for the

purpose.

Non-metallic sheathed cable, metallic

conduit or metallic sheathed cable

not approved for use as a ground

conductor shall include a separate

conductor for grounding. It should be

attached to the ground terminals of

the water heater and the electrical

distribution box.

Water heater junction box.

WARNING

Junction

box cover

Wire connections

Ground screw

Conduit

connector

Single Phase

Wiring

Total Water

Heater Wattage

Recommended Over Current Protection

(fuse or circuit breaker amperage rating)

Copper Wire Size AWG Based

on N.E.C Table 310-16 (75oC)

240V 240V

4,500 25 10

5,500 30 10

For increased energy efficiency, some

water heaters have been supplied with

two 24” sections of pipe insulation.

Please install the insulation, according

to the illustrations above, that best meets

your requirements.

Typical vertical piping arrangement Typical horizontal piping arrangement

Hot and Cold Pipe Insulation Installation

Insulation Blankets

Insulation blankets, available to the

general public, for external use on electric

water heaters are not necessary. The

purpose of an insulation blanket is to

reduce the standby heat loss encountered

with storage tank heaters. This water

heater meets or exceeds the National

Appliance Energy Conservation Act

standards with respect to insulation and

standby loss requirements making an

insulation blanket unnecessary.

The manufacturer’s warranty does not

cover any damage or defect caused by

installation, attachment or use of

any type of energy saving or other

unapproved devices (other than those

authorized by the manufacturer) into, onto

or in conjunction with the water heater.

The use of unauthorized energy saving

devices may shorten the life of the water

heater and may endanger life and property.

The manufacturer disclaims any

responsibility for such loss or injury

resulting from the use of such

unauthorized devices.

CAUTION: If local codes require the

application of an external insulation

blanket to this water heater, pay careful

attention to the following so as not to

restrict the proper function and

operation of the water heater:

DO NOT cover the operating or

warning labels attached to the water

heater or attempt to relocate them on

the exterior of insulation blanket.

DO NOT apply insulation to the top of

the water heater. This could interfere

with the safe operation of the electrical

junction box.

DO NOT cover the jacket access

panel(s) to the thermostat(s) and heating

element(s), or pressure and temperature

relief valve.

Inspect the insulation blanket frequently.

WARNING: If local

codes require external

application of insulation

blanket kits the

manufacturer’s instructions

included with the kit must

be carefully followed.

Installing the water heater

For increased energy efficiency, some

water heaters have been supplied with

a 2-3/8” section of pipe insulation.

Please install the insulation, according

to the illustrations above, that best

meets your requirements.

Slip the insulation cover over the

T&P Valve through the center hole

and align the hole in the side with the

opening of the T&P Valve.

Typical top connection arrangement

Relief Valve Insulation Installation

CAUTION: Ensure the

T&P Valve opening is not

obstructed by the

insulation.

Heat Trap

For increased energy efficiency, some

water heaters have been supplied with

factory installed internal or external

heat traps in the hot outlet and cold

water inlet openings.

NOTICE: DO NOT apply heat to the

HOT or COLD water connections.

If sweat connections are used, sweat

tubing to adapter before fitting adapter

to the water connections on heater. Any

heat applied to the water supply fittings

will permanently damage the dip tube

and/or heat traps.

LeakGuardTM

This water heater is equipped with built-

in leak detection and automatic water

shut off valve. The leak detection device

(LeakSenseTM) detects the presence of

water and immediately alerts the elec-

tronic control as the EcoNet app on the

cellular phone. When water is detected,

the electronic controls will shut down

the heating elements and the automatic

water shut off valve closes. Please see

more details on servicing on page 17.

WARNING: Failure to

follow the instructions

provided in this manual

may permanently damage

the unit and void the

manufacturer’s warranty.

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