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A properly-sized and charged thermal expansion tank must
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: To protect against untimely corrosion of hot and cold
water fi ttings, it is recommended that di-electric unions or
couplings be installed on this water heater when connected
to copper pipe.
CAUTION
Property Damage Hazard
• Avoid water heater damage.
• Install thermal expansion tank if necessary.
• Do not apply heat to cold-water inlet or hot-water outlet.
• Contact qualified installer or service agency.
TEMPERATURE-PRESSURE RELIEF VALVE
WARNING
This water heater is provided with a properly rated/sized
and certifi ed combination Temperature-Pressure Relief
Valve (T&P valve) by the manufacturer. 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 for
Relief Valves for Hot Water Supply Systems, ANSI
Z21.22-CSA 4.4, and the code requirements of ASME.
If replaced, the new T&P valve must meet the requirements
of local codes, but not less than a combination temperature-
pressure relief valve rated/sized and certifi ed as indicated
in the above paragraph. The new valve must be marked
with a maximum set pressure not to exceed the marked
hydrostatic working pressure of the water heater (150 psi)
and a discharge capacity not less than the water heater
Btu/hr input rate as shown on the water heater's model
rating plate.
For safe operation of the water heater, the temperature-
pressure relief valve must not be removed from its
16
Explosion Hazard
•
Temperature-pressure relief
valve must comply with ANSI
Z21.22-CSA4.4 and ASME
code.
•
Properly sized temperature-
pressure relief valve must be
installed in opening provided.
•
Do not plug, block, or cap the
discharge line.
•
Failure to follow this warning
can result in excessive tank
pressure, serious injury or
death.
designated opening nor plugged. The T&P valve must be
installed directly into the fi tting of the water heater designed
for the relief valve. Install discharge piping so that any
discharge will exit the pipe within 6 " above an adequate
fl oor drain, or external to the building. In cold climates it is
recommended that it be terminated at an adequate drain
inside the building. Be certain that no contact is made with
any live electrical part.
The discharge opening must not be blocked or reduced
in size under any circumstances. Excessive length (over
30' ), or use of more than four elbows can cause restriction
and reduce the discharge capacity of the valve.
No valve or other obstruction is to be placed between the
T&P valve and the tank. Do not connect discharge piping
directly to the drain unless a maximum of 6 " air gap is
provided. To prevent bodily injury, hazard to life, or property
damage, the relief valve must be allowed to discharge
water in adequate quantities should circumstances
demand. If the discharge pipe is not connected to a drain
or other suitable means, the water fl ow may cause property
damage.
Temperature-pressure relief valve discharge pipe
•
must terminate at an adequate drain.
T&P Valve Discharge Pipe Requirements:
•
Shall not be smaller in size than the outlet pipe size
of the valve, or have any reducing couplings or other
restrictions.
•
Shall not be plugged or blocked.
•
Shall not be exposed to freezing temperatures.
•
Shall be of material listed for hot water distribution.
•
Shall be installed so as to allow complete drainage
of both the temperature-pressure relief valve and the
discharge pipe.
•
Must terminate a maximum of 6 " above a fl oor drain
or external to the building. In cold climates, it is
recommended that the discharge pipe be terminated
at an adequate drain inside the building
•
Shall not have any valve or other obstruction between
the relief valve and the drain.
DANGER
www. hotwater .com
CAUTION
Water Damage Hazard
• Burn hazard.
• Hot water discharge.
• Keep clear of
HOT
HOT
temperature-pressure
relief valve discharge.
BURN
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