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POWER
VT®WATER
HEATER
MAINTENANCE AND SAFETY INSPECTIONS
1. Establish a preventive maintenance program to
assure a longer water heater life.
2. The tank should be flushed at two- or three-
month intervals depending on water
cond!~ions
in
your location. To flush,
turn off E!lectrical
disconnect switch to prevent the burner from
operating. Open the drain valve and allow water
to flow through the tank until it runs clear. Close
the drain valve and turn the electrical switch back
on. Draining two or three gallons from the. bottom
of the tank on a weekly basis will also help
prevent the accumulation of sediment Water
impurities consist of fine particles of s?iI and
sand, which will settle out and form a layer of
sediment on the bottom of the tank.
.
3. A scale of lime will normally form during
operation and will accumulate on the bottom of
the tank. Lime is formed from the natural
chemicals in the water, which precipit;,;Je out
during heating cycles. Some water sJpplies
contain more of these chemicals than others do
and scale buildUp will occur more rapidly.
Other factors affecting scale buildup are the
amount of hot water used and the temperature of
the water. The more hot water used, the more
fresh water containing scale-forming chemicals is
brought into the tank.
As
the temperature of
water increases, the rate of scale deposition will
increase.
4. The tank may have a handhole for inspection and
cleaning. (See Figure 19-1, page 2). To inspect
tank for scale buildup, remove the handhole
cover. If scale is present, it can be loosened with
a high-pressure stream of water. The smaller
pieces can be flushed through the drain and the
larger pieces removed by hand through the
handhole. The frequency of inspections will be
determined by the rate of scale bUildup. Intervals
of
30--60
days are recommended.
5. If a firetube leaks for any reason, consult the
factory for instructions.
NOTE: Condensate coming from the tubes on
a cold start is normal and does not indicate a
leaking tube.
CARBON MONOXIDE WARNING:
CAUTION: IMPROPER COMBUSTION MAY CAUSE SERIOUS INJURY OR DEATH.
PVI recommends a seasonal or annual combustion checkout be performed by a
qualified service agency to ensure safe and efficient operation.
Periodic Inspection of Operational Components
Periodic inspection and checkout of the burner ignition, control system, and fuel valve operation (for
tight close off) should be made. Refer to he burner installation instructions for recommended.
NOTE: Always secure gas lines and tag "Out
of Service" before servicing burner nozzle or
electrodes.
3. Remove the flame safeguard control from its
base. Check the connections in control mounting
base; loose connections can cause nuisance
shutdowns.
4. Pull the nozzle assembly to check the flame
and ignition electrodes. This is done by first
disconnecting the gas train by breaking at the
unions. Then remove the nozzle assembly with
the electrodes and pressure plate attached.
Disconnect the electrode wires. Take care not
to damage the insulation on the electrodes.
POWER
VT®WATER
HEATER
1. Examine the venting system at least once each
year for proper connections, alignment and
corrosion. The static fan inlet will collect dust
from the air during operation. DisconnEct the
power to the heater and clean the fan: guard
when necessary.
.
2. The burner should be cleaned each year
according
to
the
burner
manufacturer's
recommended procedures. Inspect all parts and
make replacements when necessary.· Check
wiring for loose connections and burned wires.
PV500-19 04-2005
15
Section 19
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