John Wood Envirosense Power Vent - Manual (Page 27)

27
for Your InforMatIon
start up condItIons
sMoKe/odor
It is not uncommon to experience a small amount of smoke and odor
during the initial start-up. This is due to burning off of oil from metal
parts, and will disappear in a short while.
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 local
plumbing service agency to have a thermal expansion tank installed.
stranGe sounds
Possible noises due to expansion and contraction of some metal
parts during periods of heat-up and cool-down do not necessarily
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 “Condensate” in this section.
operatIonal condItIons
sMellY water
In each water heater there is installed at least one anode rod (see
parts section) for corrosion protection of the tank. Certain water
conditions will cause a reaction between this rod and the water.
The most common complaint associated with the anode rod is one
of a “rotten egg smell” in the hot water. The smell is a result of four
factors which must all be present for the odor to develop:
a. A concentration of sulfate in the supply water.
b. Little or no dissolved oxygen in the water.
c. A sulfate reducing bacteria which has accumulated within the
water heater (this harmless bacteria is nontoxic to humans).
d. An excess of active hydrogen in the tank. This is caused by the
corrosion protective action of the anode.
Smelly water may be eliminated or reduced in some water heater
models by replacing the anode(s) with one of less active material,
and then chlorinating the water heater tank and all water lines.
Contact the local water heater supplier or service agency for
further information concerning an Anode Replacement Kit and this
chlorination treatment.
If the smelly water persists after the anode replacement and
chlorination treatment, we can only suggest that chlorination or aeration
of the water supply be considered to eliminate the water problem.
do not remove the anode leaving the tank unprotected. By doing
so, all warranty on the water heater tank is voided.
“aIr” In hot water faucets
HYDROGEN GAS: Hydrogen gas can be produced in a hot water
system that has not been used for a long period of time (generally two
weeks or more). Hydrogen gas is extremely flammable and explosive.
To prevent the possibility of injury under these conditions, we
recommend the hot water faucet, located farthest away, be opened
for several minutes before any electrical appliances which are
connected to the hot water system are used (such as a dishwasher
or washing machine). If hydrogen gas is present, there will probably
be an unusual sound similar to air escaping through the pipe as the
hot water faucet is opened. There must be no smoking or open flame
near the faucet at the time it is open.
hIGh water teMperature shut off sYsteM
This water heater is equipped with an automatic gas shut-off system.
This system works when high water temperatures are present. Turn
“OFF” the entire gas supply to the water heater. The high temperature
shut-off is built into the gas control valve. It is non-resettable. If the
high temperature shut-off activates, the gas control valve must be
replaced. Contact your gas supplier or service agency.