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(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.
NOTE: If using copper tubing, solder tubing to an
adapter before attaching the adapter to the water
heater connections. Do not solder the water lines
directly to the water heater connections. It will harm
the dip tube and damage the tank.
SHUT-OFF
VALVE
COLD WATER
INLET
FIGURE 16
NOTE: To protect against untimely corrosion of hot
and cold water fi ttings, it is strongly recommended
that di-electric unions or couplings be installed on
this water heater when connected to copper pipe (see
Figure 3 also).
Figures 3 and 16 show the typical attachment of the water
piping to the water heater. The water heater is equipped
with 3/4" NPT water connections.
20
HARD WATER
We highly recommend installing water fi ltering system or
a water softener before the water heater system. If you
are installing a water fi ltering system use a 5 micron fi lter
to reduce particles that can potentially cause nuisance
shutdown problems and prolong the maintenance of the
water heater's inlet fi lter. A water softener can affect the
life of the anode installed in this water heater. Refer to
"Anode Rod Inspection" section in this manual.
Clean the fi lter on the water inlet as frequently as required
by the quality of your local water. Refer to "Cleaning The
Inlet Water Filter" section of this manual. One additional
fi lter is supplied with your water heater.
TEMPERATURE-PRESSURE RELIEF VALVE
TEMPERED
POTABLE WATER
This heater is provided with a properly certifi ed combination
MIXING
temperature - pressure relief valve by the manufacturer.
VALVE
(OPTIONAL)
The valve is certifi ed by a nationally recognized testing
laboratory that maintains periodic inspection of production
of listed equipment of materials as meeting the requirements
PIPE INSULATION
for Relief Valves for Hot Water Supply Systems, ANSI
(RECOMMENDED)
Z21.22 • CSA 4.4, and the code requirements of ASME.
If replaced, the valve must meet the requirements of local
codes, but not less than a combination temperature and
pressure relief valve certifi ed as indicated in the above
Rear View
paragraph.
The valve must be marked with a maximum set pressure
not to exceed the marked hydrostatic working pressure of
the water heater (150 psi = 1,035 kPa) and a discharge
capacity not less than the water heater Btu/hr input rate
as shown on the water heater's rating plate.
For safe operation of the water heater, the relief valve
must not be removed from its designated opening nor
plugged.
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