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24 • Residen al Standard Gas Water Heater Use and Care Guide
OPERATION
3
Allow the water heater’s main
burner to operate for fi ve
minutes. Pass a newly ex n-
guished match approximately one inch
from the dra hood’s relief opening.
Smoke from the match should be
steadily drawn into the opening indicat-
ing the water heater is ge ng adequate
air and the vent system is working.
Figure 35 - Test the air supply and vent to make
sure the water heater has adequate air and is
venting properly.
4
If the main burner has been
opera ng for fi ve minutes but
the match smoke dri s around
or is blown away from the opening, turn
the gas control knob OFF. Inspect the
vent system and repair if necessary. In
many cases, failure to pass the air
supply and vent test indicates the water
heater is not ge ng enough air or there
is a problem with the vent system. It
may be necessary to increase the air
supply by ge ng air from outside (see
page 7).
WARNING! Burn Hazard. Do not
touch the vent, doing so can cause
burns. If the dra hood does not draw
in smoke from a match a er fi ve
minutes of main burner opera on,
shut the gas supply off , and do not
operate the water heater un l the vent
system and air supply have been
checked by a qualifi ed person and
repaired if necessary. Con nuing to
operate the water heater in this
condi on could lead to serious injury
or death from carbon monoxide
poisoning.
Temperature Control
System
Adjus ng the Temperature
With the installa on steps completed,
you may adjust the water heater’s tem-
perature se ng if desired.
1
Set the gas valve to the desired
temperature. The “HOT”
se ng sets the water tem-
perature to approximately 120°F,
reducing the risk of scald injury. You
may wish to set a higher temperature to
provide hot water for automa c
dishwashers or laundry machines, to
provide more hot water capacity, and to
reduce bacterial growth. Higher tank
temperatures (140° F) kill bacteria that
cause a condi on known as “smelly
water” and can reduce the levels of
bacteria that cause water-borne
diseases.
Water usage pa erns, as well as heat
from sources such as solar collectors,
ambient air, and the pilot light can
result in temperatures higher than the
thermostat set-point.
WARNING! Higher temperatures
increase the risk of scalding, but even at
120°F, hot water can scald (see Table 1).
Install Thermosta c Mixing Valve(s) at
each point-of-use to reduce the risk of
scalding.
2
To adjust the water heater’s
thermostat:
Figure 36 - Adjust the gas control knob to “HOT”.
Turn the gas control knob on the gas
control valve to the right to the follow-
ing se ngs.
• “A” 128°F
• “B” 138°F
• “C” 147°F
• “VERY HOT” 160°F
NOTICE: The temperatures above are
approximates. The actual temperature
of the heated water may vary.
3
Wait for the water to heat up.
If you have no hot water a er
two hours, refer to the
Troubleshoo ng Sec on (see page 25).
NOTICE: If the tank is full of cold water,
condensa on may form inside the
water heater. This condensa on may
drop on the burner causing a sizzling
sound. In some cases, you may see a
small puddle on the fl oor. Condensa-
on is normal and should go away once
the tank reaches its normal opera ng
procedure.
WARNING! If you have increased
the temperature se ng and the
Thermosta c Mixing Valves are not set
properly (or not installed) you could
scald yourself while checking the
temperature.
4
Check water temperature at
several points of use in your
home (for example, bathtub
faucet, shower, or lavatory sink) and
adjust the Thermosta c Mixing Valves
as needed. If you aren’t sure how to
adjust the Thermosta c Mixing Valve
se ngs, or aren’t sure if you have
Thermosta c Mixing Valves, contact a
qualifi ed person.
Opera ng Modes
The gas control valve has two diff er-
ent opera ng modes: Standard and
Vaca on. The Standard mode allows
you to adjust the water temperature
to your desired se ng. The Vaca on
(VAC) mode sets the thermostat at
approximately 55°F and is recom-
mended when not using hot water for
an extended period of me. The VAC
se ng also reduces energy losses and
24 • Residen al Standard Gas Water Heater Use and Care Guide
OPERATION
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