27
Venting system
examine the venting system every six months for obstructions
and/or deterioration of the vent piping. Check all vent system
connections for leakage and repair or reseal as necessary.
remove all soot or other obstructions from chimney which will
retard free draft.
intake air sCreen
The intake air screen is attached to the inlet end of the combustion
blower. Inspect the intake air screen every six months. The intake air
screen should be cleaned of any buildup of debris or foreign material.
temperature-pressure relief ValVe test
• Burn hazard.
• Hot water discharge.
• Keep clear of Temperature-
Pressure Relief Valve
discharge outlet.
It is recommended that the Temperature-Pressure relief Valve
should be checked to ensure that it is in operating condition
every 6 months.
When checking the Temperature-Pressure relief Valve operation,
make sure that (1) no one is in front of or around the outlet of the
Temperature-Pressure relief Valve discharge line, and (2) that
the water discharge will not cause any property damage, as the
water may be extremely hot. Use care when operating valve as
the valve may be hot.
To check the relief valve, lift the lever at the end of the valve
several times, see Figure 25. The valve should seat properly and
operate freely.
If after manually operating the valve, it fails to completely reset and
continues to release water, immediately close the cold water inlet
to the water heater and drain the water heater, see Draining and
Flushing on page 29. replace the Temperature-Pressure relief
Valve with a properly rated/sized new one, see Temperature-
Pressure relief Valve on pages 13-14 for instructions on
replacement.
figure 25.
If the Temperature-Pressure relief Valve on the water heater
weeps or discharges periodically, this may be due to thermal
expansion.
nOTe: excessive water pressure is the most common cause of
Temperature-Pressure relief Valve leakage. excessive water
system pressure is most often caused by "thermal expansion"
in a "closed system." See Closed Water Systems and Thermal
expansion on page 13. The Temperature-Pressure relief Valve
is not intended for the constant relief of thermal expansion.
Temperature-Pressure relief Valve leakage due to pressure build
up in a closed system that does not have a thermal expansion
tank installed is not covered under the limited warranty. Thermal
expansion tanks must be installed on all closed water systems.
DO nOT PlUG THe TeMPerATUre-PreSSUre relIeF
VAlVe OPenInG. THIS CAn CAUSe PrOPerTY DAMAGe,
SerIOUS InJUrY Or DeATH.
explosion hazard
Te
mperature-Pressure relief Valve
must comply with AnSI Z21.22
-
CSA 4.4 and ASMe code.
Properly sized temperature-
pressure relief valve must be
installed in opening provided.
Can result in overheating and
excessive tank pressure.
Can cause serious injury or death.
anode rod inspeCtion
The anode rod is used to protect the tank from corrosion. Most
hot water tanks are equipped with an anode rod. The submerged
rod sacrifices itself to protect the tank. Instead of corroding tank,
water ions attack and eat away the anode rod. This does not affect
water’s taste or color. The rod must be maintained to keep tank
in operating condition.
Anode deterioration depends on water conductivity, not necessarily
water condition. A corroded or pitted anode rod indicates high
water conductivity and should be checked and/or replaced more
often than an anode rod that appears to be intact. replacement
of a depleted anode rod can extend the life of your water heater.
Inspection should be conducted by a qualified technician, and at
a minimum should be checked annually after the warranty period.
Artificially softened water is exceedingly corrosive because the
process substitutes sodium ions for magnesium and calcium ions.
The use of a water softener may decrease the life of the water
heater tank.
The anode rod should be inspected after a maximum of three
years and annually thereafter until the condition of the anode
rod dictates its replacement. Anode replacement is not covered
by warranty.
nOTe: Artificially softened water requires the anode rod to be
inspected annually.
maintenanCe
