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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 Specifications
Tank
Model
Capacity
Number
In Gallons
Diameter
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
Inlet*
Water
Pressure
30
Expansion
40 psi
2
Tank
Capacity
50 psi
2
Needed
60 psi
2
70 psi
2
80 psi
2
*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.
TROUBLESHOOTING GUIDE
Dimensions
in Inches
Length
On Tank
Water Heater Capacity (Gallons)
40
50
66
2
2
5
2
2
5
2
2
5
2
5
5
5
5
5
Pipe
Fitting
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
82
5
5
5
5
5
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 flame should still be drawn into the draft hood of the water
heater with its burner firing. If the flame 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.
29
FIGURE 34.
WARNING
Burn Hazard
Do not touch vent.
Doing so can result in burns.
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