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will exit the pipe within 6" (150mm) above an
adequate floor 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 feet (9.14m)), 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" (150mm) 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 flow may cause property damage.
Water Damage Hazard
• Temperature-pressure relief valve discharge pipe
must terminate at an adequate drain.
!{I__ ! • Burn hazard.
• Hot water discharge.
• Keep clear of
_I temperature-pressure
relief valve discharge.
The T&P valve must be manually operated at least
once a year. Caution should be taken to ensure
(1) no one is in front of or around the outlet of
the discharge line, and (2) the water manually
discharged will not cause any bodily injury or
property damage because the water may be
extremely hot. 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, follow the draining instructions in
this manual, and replace the temperature-pressure
relief valve with a properly rated/sized new one.
NOTE: The purpose of a temperature-pressure
relief valve is to prevent excessive temperatures
and pressures in the storage tank. The T&P valve
is not intended for the constant relief of thermal
expansion. A properly sized thermal expansion tank
must be installed on all closed systems to control
thermal expansion, see "Closed Water Systems"
and "Thermal Expansion" section.
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 six inches above
a floor 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.
Temperature-Pressure Relief Valve and
Pipe Insulation
The T&P valve installed on this water heater
is covered by insulation to minimize heat loss.
The insulation has a hole on the bottom side to
accommodate the valve outlet and allow for the
piping connection. Do not restrict the outlet opening
of the T&P valve.
T&P Relief Valve Insulation
"__X_ever (Outlet "lg on underside)
T&P Relief Valve
I- I _ T&P Relief Valve
H _'''" Drain Line
Figure 41
Locate the temperature and pressure relief valve on
the water heater (also known as a T&P relief valve).
See Figure 41.
4O
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