Residen al Standard Gas Water Heater Use and Care Guide • 25
TR
OUBLE
SHOO
TING
Residen al Standard Gas Water Heater Use and Care Guide • 25
TROUBLESHOOTING
fi
replace dampers.
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 indica ng 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 o
ff
, and do not operate
the water heater un l the vent system
and air supply have been checked by a
quali
fi
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 temperature 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 following
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 Trouble-
shoo 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 Thermo-
sta c Mixing Valves are not set properly
(or not installed) you could scald
yourself while checking the tempera-
ture.
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 quali
fi
ed
person.
Opera ng Modes
The gas control valve has two di
ff
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
keeps the tank from freezing during
cold weather but can cause a Hydrogen
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