Rheem Commercial Power Direct Vent Water heater - Manual (Page 3)

3
To meet commercial water use needs, the thermostat on this water
heater is adjustable up to 180°F. however, water temperatures over
125°F. can cause severe burns instantly or death from scalds. This
is the preferred starting point for setting the control for supplying
general purpose hot water.
Safety and energy conservation are factors to be considered when
setting the water temperature on the thermostat. The most energy
efficient operation will result when the temperature setting is the
lowest that satisfies the needs consistent with the application.
maximum water temperatures occur just after burner has shut off.
To find hot water temperature being delivered, turn on a hot water
faucet and place a thermometer in the hot water stream and read
the thermometer.
general Safety Precautions
!
The following chart details the relationship of water temperature
and time with regard to scald injury and may be used as a guide in
determining the safest water temperature for your applications.
The temperature of the water in the heater can be regulated by
setting the temperature dial on front of the thermostat. To comply
with safety regulations the thermostat was set at its lowest setting
before water heater was shipped from the factory. The illustration
below illustrates the thermostat and how to adjust the water tem-
perature.
hotter water increases the Potential for hot Water SCAlDS.
NOTiCE: mixing valves are available for reducing point of use
water temperature by mixing and cold water in branch water lines
Contact a licensed plumber or the local plumbing authority for
further information.
D A N G E R !
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
Temperature Time to Produce 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
TimE / TEmPERATURE RElATiONShiPS iN SCAlDS
DANGER !
12
0 140
°F
18
0
1
60
14
0
130
120
1
10
1
00
THERMOST AT
°C
80
7
0
60
50
4
0
To adjust the water temperature, insert a small straight
screwdriver into slotted screw in hole in front of ther-
mostat and turn wheel to desired setting. Thermostat
is adjustable up to 180º F.
CAUTiON!! - hotter water increases the risk of SCAlDiNg!
White-Rodgers honeywell
NOTiCE: Each water heater will contain one (1) of the above ther-
mostats. Refer to actual unit to determine which one.