9
Table 2 details the relationship of water temperature and time with regard to scald injury and may be used as a
guide in determining the safest water temperature for your applications.
E. TEMPERATURE AND PRESSURE RELIEF VALVE
A factory installed temperature and pressure relief valve long element, meeting the requirements for relief valves
for hot water heaters ANSI Z21.22B / CSA 4.4-M99, has been installed for your safety and convenience. If
servicing, make sure that the relief valve is sized to the BTU/hour capacity and storage capacity of the water
heater. If the relief valve weeps, see expansion tank section for suggestions.
Do not thread a cap or plug into the relief valve under any circumstances! Explosion and property damage,
serious injury, or death may result.
To avoid water damage or scalding due to relief valve operation:
Discharge line must be connected to relief valve outlet and run to a safe place of disposal. Terminate the
discharge line in a manner that will prevent possibility of severe burns or property damage should the
relief valve discharge.
Discharge line must be as short as possible and the same size as the valve discharge connection
throughout its entire length.
Discharge line must pitch downward from the valve and terminate at least 6” above the floor drain,
making discharge clearly visible.
The discharge line shall terminate plain, not threaded, with a material serviceable for temperatures of
375
o
F or greater.
Do not pipe discharge to any location where freezing could occur.
No shutoff valve may be installed between the relief valve and heater or in the discharge line. Do not plug
or place any obstruction in the discharge line.
Test the operation of the relief valve after filling and pressurizing the system by lifting the lever. Make sure
the valve discharges freely. If the valve fails to operate correctly, immediately replace with a new properly
rated relief valve.
Test T&P valve at least once annually to ensure the waterway is clear. If valve does not operate, turn the
heater “off” and call a plumber immediately.
Take care whenever operating relief valve to avoid scalding injury or property damage.
FAILURE TO COMPLY WITH THE ABOVE GUIDELINES COULD RESULT IN FAILURE OF RELIEF VALVE
OPERATION, RESULTING IN POSSIBILITY OF SUBSTANTIAL PROPERTY DAMAGE, SEVERE PERSONAL
INJURY, OR DEATH.
F. HOT WATER OUTLET
Use both thread tape and pipe dope to connect an NPT male x ¾” (minimum) pipe adapter. A shut off valve
between the hot water supply and tank outlet is recommended for ease of service at a later date. Use a backflow
preventer specifically designed for water heater installations. This valve should be installed on the cold water fill
supply line per local codes.
Dielectric fittings must be used on water heater connections.
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