QUARTERLY INSPECTION
1. Monitor thermostat
a. Let water heater completely heat to a designated thermostat setting.
b. After thermostat satisfies (that is, when the thermostat actually clicks off), draw
water from heater.
c. Compare water temperature of drawn water to the temperature setting of the
thermostat when it satisfies. Normal variation between the two points is
approximately +
5°F.
d. If these two readings do not coincide within acceptable tolerances and
verification has been made of the accuracy of the temperature-reading
gauge, replace the thermostat.
2. Lift test lever on relief valve and let water run through valve for a period of
approximately 10 seconds. This will help flush away any sediment that might
build up in water passageways.
ANNUAL INSPECTION
1. Units subject to fouling or scaling should be cleaned periodically. A marked
increase in pressure drop and/or reduction in performance usually indicates
cleaning is necessary.
2. To clean inside of tubes, remove all heads and covers. (Caution: Do not loosen
heads until you are sure all pressure is off the equipment, and the unit is
drained).
3. In cleaning a tube bundle, tubes should not be hammered on. If it is necessary to
use scrapers, care should be taken to insure that the tubes are not damaged
.
4. Before it is necessary to apply mechanical means for cleaning, try to clean the
unit using the following methods.
a. Circulate hot fresh water at a reasonable velocity.
b. Try spraying with water hose.
c. Consult with manufacturers of cleaning compounds and chemicals. They
will check the nature of the deposit, recommend the right cleaning
compound, and in many cases provide equipment and personnel for a
complete cleaning job.
5. Do not clean tubes by blowing steam through individual tubes.
6. To tighten a loose tube joint, use a suitable roller type tube expander. Do not
roll tubes that are not leaking. If double wall tubes are supplied return to the
factory for repairs.
7. If the unit is dismantled for any reason, it should be reassembled using new
gaskets.
8. Do not tighten bolts until gaskets are properly seated.
9. Exterior of unit should be cleaned and if necessary repainted.
10. When tightening bolts in the element head, tighten the bolts in a criss-cross
pattern. This will evenly distribute pressure around the flange, and help prevent
warping. See diagram below.
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