A.O. Smith G6-PVT4050NV Installation Instructions And Use & Care Manual page 25

OPERATION
Check all vent system connections for
damage or deterioration which could
cause improper venting or leakage of
combustion products. Repair or reseal
as necessary.
Be sure the vent piping is properly
connected to prevent escape of
dangerous flue gases which could
cause deadly asphyxiation.
Obstructions and deteriorated vent
systems may present serious health
risk or asphyxiation.
Chemical vapor corrosion of the flue
and vent system may occur if air for
combustion contains certain chemical
vapors. Spray can propellants,
cleaning solvents, refrigerator and air
conditioner refrigerants, swimming
pool chemicals, calcium and sodium
chloride, waxes, bleach and process
chemicals are typical compounds
which are potentially corrosive.
If after inspection of the vent system
you found sooting or deterioration,
something is wrong. Call the local
gas utility to correct the problem and
clean or replace the flue and venting
before resuming operation of the
water heater.
Temperature Control
System
Adjusting the Temperature
With the installation steps completed,
you may adjust the water heater's
temperature setting if desired.
Set the gas valve to the
1
desired temperature. The
"HOT" setting 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 automatic
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 condition known as
"smelly water" and can reduce the
levels of bacteria that cause water-
borne diseases.
Water usage patterns, 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. Install
Thermostatic Mixing Valve(s) at each
point-of-use to reduce the risk of
scalding.
To adjust the water heater's
2
thermostat:
TO LIGHT PILOT:
PRESS / HOLD KNOB IN POSITION
PRESS IGNITER BUTTON UNTIL PILOT LIGHTS
RELEASE KNOB WHEN STATUS LIGHT BLINKS
LOW
VAC OFF
PILOT
Figure 45 - Adjust the gas control knob to "HOT".
Turn the gas control knob on the
gas control valve to the right to the
following settings.
• "A" 128°F
• "B" 138°F
• "C" 147°F
• "VERY HOT" 155°F
NOTICE: The temperatures above are
approximates. The actual temperature
of the heated water may vary.
Wait for the water to heat
3
up. If you have no hot water
after two hours, refer to the
Troubleshooting Section (see page
26).
NOTICE: If the tank is full of cold
water, condensation may form inside
the water heater. This condensation
may drop on the burner causing a
sizzling sound. In some cases, you
may see a small puddle on the floor.
Condensation is normal and should go
away once the tank reaches its normal
operating procedure.
WARNING! If you have increased
the temperature setting and the
Thermostatic Mixing Valves are not
set properly (or installed) you could
scald yourself while checking the
temperature.
Operating Modes
The gas control valve has two
different operating modes: Standard
and Vacation. The Standard mode
allows you to adjust the water
temperature to your desired setting.
The Vacation (VAC) mode sets the
thermostat at approximately 55°F
and is recommended when not using
hot water for an extended period of
time. The VAC setting also reduces
energy losses and keeps the tank from
freezing during cold weather but can
cause a Hydrogen gas build up. See
caution on page 6.
Residential Gas Water Heater Use and Care Guide • 25