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19
The thermostat is adjusted to its lowest temperature when
it is shipped from the factory. Water temperature can be
regulated by moving the temperature dial to the preferred
setting. The preferred starting point is 120°F. Align the
index bar on the thermostat with the desired water
temperature as shown in Figure 19. There is a hot water
scald potential if the thermostat is set too high.
NOTE: During low demand periods when hot water is not
being used, a lower thermostat setting will reduce energy
losses and may satisfy your normal hot water needs. If hot
water use is expected to be more than normal, a higher
thermostat setting may be required to meet the increased
demand. When leaving your home for extended periods
(vacations, etc.) turn the temperature dial to its lowest
setting. This will maintain the water at low temperatures
with minimum energy losses and prevent the tank from
freezing during cold weather.
Figure 18
Flame Characteristics
Correct flame
soft blue
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.
Feel water before bathing or showering.
Temperature limiting valves are available.
WARNING
Burner Flames
Inspect burner
flames through
viewport.
Flames should
be very small
with a blue
haze and
small amounts
of yellow or
orange at the
edges. After
several minutes
of operation the
burner screen may glow red. If large flames are observed
at anytime shut-off unit and call a qualified person.
Stacking
Stacking occurs when a series of short draws of hot water
(3 gallons or less) are taken from the water heater tank.
This causes increased cycling of the burner and can result
in increased water temperatures at the hot water outlet. An
anti-scald device is recommended in the hot water supply
line to reduce the risk of scald injury.
Emergency Shut Down
IMPORTANT: Should overheating occur or the gas supply
fails to shut off, turn off the water heater’s manual gas
control valve and call a qualified person.
Water Temperature Regulation
IMPORTANT: Adjusting the thermostat past 120°F on the
temperature dial will increase the risk of scald injury in the
times shown below.
C
A
U
T
I
O
N
W
A
T
E
R
I
N
C
R
E
A
S
E
S
H
O
T
T
E
R
T
H
E
R
I
S
K
O
F
S
C
A
L
D
I
N
J
U
R
Y
V
A
C
A
T
I
O
N
W
A
R
M
H
O
T
120°F
Bar
130°F
Bar
Reset
Button
Gas Control Knob
Dial Stop
Index
Bars
Temperature Dial
Gas Control Knob
(Off-PIlot-On)
Index Bar
Temperature Dial
130°F
Mark
120°F
Mark
Figure 19
Gas Valve/Thermostat
Settings
White Rodgers Gas Valve
Robertshaw Gas Valve
Water
Temperature °F
Time for 1st
Degree Burn
(Less Severe Burns)
Time for
Permanent Burns
2nd & 3rd Degree
(Most Severe Burns)
110
116
116
122
131
140
149
154
(normal shower temp.)
(pain threshold)
35 minutes
1 minute
5 seconds
2 seconds
1 second
instantaneous
45 minutes
5 minutes
25 seconds
5 seconds
2 seconds
1 seconds
(U.S. Government Memorandum, C.P.S.C., Peter L. Armstrong, Sept. 15,1978)