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If replaced,thevalvemustmeettherequirementsof local
codes,butnotlessthana combinationtemperatureand
pressurereliefvalvecertifiedas indicatedin theabove
paragraph.
Thevalvemustbemarkedwithamaximumsetpressurenotto
exceedthemarkedhydrostaticworkingpressureofthewater
heater(150psi= 1,035kPa)andadischargecapacitynotless
thanthewaterheaterinputrateasshownonthemode!rating
plate.
Forsafeoperationofthewaterheater,thereliefvalvemustnot
beremovedfromitsdesignatedopeningnorplugged.
Thetemperature-pressurereliefvalvemustbeinstalleddirectly
intothefittingofthewaterheaterdesignedforthereliefvalve.
Positionthevalvedownwardandprovidetubingsothatany
dischargewillexitonlywithin6 inches(153mm)above,orat
anydistancebelowthestructuralfloor,seeFigure16.Becertain
thatnocontactis madewithanyliveelectricalpart. The
dischargeopeningmustnotbeblockedorreducedin size
underanycircumstances.Excessivelength,over30feet
(9.14m),oruse 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 relief
valve and the tank. Do not connect tubing directly to discharge
drain unless a 6 inch air gap is provided. To prevent bodily
injury, hazard to life, or property damage, the relief valve must
be allowed to discharge water in 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.
HOT WATER
OUTLET
RELIEF VALVE
{OPTIONAL TOP T&P REMEF
VALVE NOT SHOWN)
DmSCHARGE PmPE
{DO NOT CAP OR PLUG}
* FLOOR DRAIN
FIGURE l&
Water Damage Hazard
• Temperature-pressure relief valve discharge
pipe must terminate at adequate drain.
The Discharge Pipe:
• 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 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.
Shall terminate at an adequate drain.
• Shall not have any valve between the relief valve and tank.
Water temperature over 125°F
(52°C) can cause severe burns
instantly resulting in severe injury
or death,
Children, the elderly, and the
physically or mentally disabled
are at highest risk for scald injury,
Feel water before bathing or
showering
Temperature limiting valves are
availabb.
Read instruction manual for safe
temperature setting,
The temperature-pressure relief valve must be manually
operated at least once a year. Caution should be taken to
ensure that (1) no one is in front of or around the outlet of the
temperature-pressure relief valve 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,
and replace the temperature-pressure relief valve with a new
one.
Filling the Water Heater
Property Damage Hazard
, Avoid water heater damage.
o Fill tank with water before operating.
14
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