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13

If adjustment is necessary…

Turn off the power to the water
heater.

Remove the jacket access panel(s)
and insulation exposing the
thermostat(s).

The thermostat protective cover(s)
should not be removed. 

Using a small screwdriver, set the
thermostat(s) dial pointer(s) to 
the desired temperature.

Replace the insulation and jacket
access panel(s). Turn on the power
to the water heater.

R

E

S

E

T

R

E

S

E

T

TURN OFF

POWER

BEFORE

SERVICING

90

°

F

150

°

F

125

°

F

Type 59T thermostat and
protective cover.

Time/Temperature Relationship in Scalds

Temperature

Time To Produce a Serious Burn

120°F

More than 5 minutes

125°F

1

1

/

2

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 1

1

/

2

seconds

155°F

About 1 second

Table courtesy of Shriners Burn Institute

DANGER: There is a hot

water scald potential 
if the thermostat is set 
too high. Households with
small children, disabled, or
elderly persons may
require a 120°F or lower
thermostat setting to
prevent contact with 
HOT water.

Water Temperature Setting

The temperature of the water in the
water heater can be regulated by setting
the temperature dial of the adjustable
surface mounted thermostat(s) located
behind the jacket access panel(s). 

Dual element heaters have two
thermostats. 

Safety and energy conservation are
factors to be considered when selecting
the water temperature setting of the
water heater’s thermostat(s). The lower
the temperature setting, the greater the
savings in energy and operating costs.

To comply with safety regulations the
thermostat(s) are factory set at 120°F
or less where local codes require. This is
the recommended starting point.

Water temperatures above 125°F 
can cause severe burns or death from
scalding. Be sure to read and follow the
warnings outlined in this manual and on
the label on the water heater. This label
is located on the water heater near the
thermostat access panel.

Mixing valves are available for reducing
point of use water temperature by mixing
hot and cold water in branch water lines.
Contact a licensed plumber or the local
plumbing authority for further
information.

The chart below may be used as a guide
in determining the proper water
temperature for your home.

Reset button

Thermostat

protective

cover

Thermostat
dial pointer

Safety Instructions

Installation Instructions

Operating Instructions

Care and Cleaning

T

roubleshooting Tips

Customer Service

Summary of Contents for AP12170-4

Page 1: ...carefully so that they may understand how to perform these operations Do not destroy this manual Please read carefully and keep in a safe place for future reference Recognize this symbol as an indicat...

Page 2: ...ip or cancelled check here Proof of the original purchase date is needed to obtain service under the warranty IMPORTANT Fill out and return the Consumer Product Registration Card that is in the back o...

Page 3: ...e Operating Instructions in this manual for detailed instructions in how to adjust the thermostat s DANGER Hotter water increases the Potential for Hot Water SCALDS D A N G E R HOT Water temperature o...

Page 4: ...rom 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 wa...

Page 5: ...d 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...

Page 6: ...ld 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...

Page 7: ...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 shou...

Page 8: ...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 spe...

Page 9: ...ternal 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 temperature and press...

Page 10: ...opening of the T P Valve R E L I E F V A L V E COLD HOT Typical top connection arrangement Typical side connection arrangement Relief Valve Insulation Installation CAUTION Ensure the T P Valve openin...

Page 11: ...Provisions made to protect area from water damage Sufficient room to service heater Water Supply Water heater completely filled with water Air purged from water heater and piping Water connections tig...

Page 12: ...h as air escaping through the pipe as the water begins to flow Do not smoke or use an open flame near the faucet at the time it is open CAUTION The cause of the high temperature condition must be inve...

Page 13: ...n be regulated by setting the temperature dial of the adjustable surface mounted thermostat s located behind the jacket access panel s Dual element heaters have two thermostats Safety and energy conse...

Page 14: ...shorten the life of the glass lined tank and will exclude warranty coverage Care and cleaning of the water heater Draining the Water Heater CAUTION Shut off power to the water heater before draining w...

Page 15: ...connect switch if used are in the ON position The thermostat may See the Temperature regulation of the water heater be set set too low section of this manual Leaking or open hot Make sure all faucets...

Page 16: ...T attempt repair of electrical wiring thermostat s heating elements or other operating controls Refer repairs to qualified service personnel Relief valve Junction box cover Anode rod Hot outlet heat t...

Page 17: ...til it breaks away from the remainder of the cavity insert See illustration to the left Discard the crossbar It cannot and need not be replaced Replace the thermostat and or element as necessary Repla...

Page 18: ...X 4 L2 RED 1 3 2 UPPER THERMOSTAT HIGH TEMP LIMIT ECO UPPER HEATING ELEMENT BLUE YELLOW BLACK L1 G BRANCH CIRCUIT TO ELECTRICAL DISTRIBUTION PANEL 240 V JUNCTION BOX 4 L2 RED 1 3 1 2 BLACK RED BLACK L...

Page 19: ...19 Rheem Manufacturing Company Warranty Registration Department P O Box 34070 Louisville KY 40232 4070 Please place in envelope and mail to Cut here Cut here...

Page 20: ...Mr Ms Mrs Miss Street Address City State Date Placed In Use Month Day Year Zip Code Apt Last Name Phone Number _ _ Complete and mail this Consumer Product Ownership Registration today After mailing th...

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