56
Start/Adjust
Setting the Water Temperature
WARNING:
Improper adjustment, alteration, service, or
maintenance can result in death, personal injury,
property damage, and/or product damage.
Maximum Temperature Adjust-
ment by the Main Display Con-
trol (UMC–117)
DANGER:
Water temperatures above 125°F (52°C) will result in
death and/or severe burns from scalding.
WARNING:
Refer to chart below and the scald potential
warnings on page 4 on this manual before making an
adjustment. Changing this setting is done at your own
risk.
Residential water heater temperatures can be
adjusted up to 140°F (60°C). DO NOT perform the
following adjustment if a setting of up to 140°F
(60°C) is not required.
To adjust the set temperature above 120°F (49°C),
please refer the following steps.
Turn on the control.
Turn off the gas and water to the water heater by
closing the shut-off valves.
Press the UP adjustment button repeatedly until
120°F (49°C) shows in the LED display. Hold the
UP button until the “120” on the display starts to
blink.
NOTICE:
LED display only shows °F.
Time/Temperature Relationship in Scalds
Water Time to Produce
Temperature a Serious Burn
120°F (49°C) More than 5 minutes
125°F (52°C) 1 1/2 to 2 minutes
130°F (54°C) About 30 seconds
135°F (57°C) About 10 seconds
140°F (60°C) Less than 5 seconds
145°F (63°C) Less than 3 seconds
150°F (66°C) About 1 1/2 seconds
155°F (68°C) About 1 second
Table courtesy of Shriners Burn Institute
1
2
3
Temperature Conversion Chart °F/°C
100 102 104 106 108 110 112 114 116
38 39 40 41 42 43 44 46 47
118 120 125 130 140 150 160 170 °F
48 49 52 54 60 66 71 77 °C
In-Use Indicator
(Lit during operation)
Priority
Indicator
Temperature
Adjustment
Buttons
LED
Temperature
and Error Code
Display
Power On/Off
Button and
Indicator
USING YOUR WATER HEATER
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