28
TROUBLESHOOTING GUIDE
Start Up Conditions
Thermal Expansion
As water is heated, it expands (thermal expansion). In a closed
system, the volume of water will grow. As the volume of water
grows, there will be a corresponding increase in water pressure
due to thermal expansion. Thermal expansion can cause
premature tank failure (leakage). This type of failure is not
covered under the limited warranty. Thermal expansion can also
cause intermittent temperature-pressure relief valve operation:
water discharged from the valve due to excessive pressure build
up. The temperature-pressure relief valve is not intended for the
constant relief of thermal expansion. This condition is not covered
under the limited warranty.
A properly-sized thermal expansion tank should be installed
on all closed systems to control the harmful effects of thermal
expansion. Contact a plumbing service agency or your retail
supplier regarding the installation of a thermal expansion tank.
Table 1: Thermal Expansion Tank Speci
fi
cations
Model
Number
Tank
Capacity
In Gallons
Dimensions
in Inches
Pipe
Fitting
On Tank
Diameter
Length
153.331020
2
8 (203 mm) 12-3/4 (323 mm) 3/4” Male
153.331050
5
11 (279 mm) 14-3/4 (375 mm) 3/4” Male
Table 2: Expansion Tank Sizing Chart
Expansion
Tank
Capacity
Needed
Inlet*
Water
Pressure
Water Heater Capacity (Gallons)
30
40
50
66
82
40 psi
2
2
2
5
5
50 psi
2
2
2
5
5
60 psi
2
2
2
5
5
70 psi
2
2
5
5
5
80 psi
2
5
5
5
5
*Highest recorded inlet water pressure in a 24 hour period or
regulated water pressure.
NOTE: Expansion tanks are pre-charged with a 40 psi air
charge. If the inlet water pressure is higher than 40 psi,
the expansion tank’s air pressure must be adjusted to
match that pressure, but must not be higher than 80 psi.
FIGURE 35.
Strange Sounds
Possible noises due to expansion and contraction of some metal
parts during periods of heat-up and cool-down do not represent
harmful or dangerous conditions.
Condensation causes sizzling and popping within the burner area
during heating and cooling periods and should be considered
normal. See
Condensation
section.
Draft Hood Operation
Do not touch vent.
Doing so can result in burns.
WARNING
Burn Hazard
Check draft hood operation by performing a worst case
depressurization of the building. With all doors and windows closed,
and with all air handling equipment and exhaust fans operating
such as furnaces, clothes dryers, range hoods and bathroom fans,
a match
fl
ame should still be drawn into the draft hood of the water
heater with its burner
fi
ring. If the
fl
ame is not drawn toward the draft
hood after 15 minutes of burner operation, shut off water heater
and make necessary air supply changes to correct.
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