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Instructions for Installation (cont'd)
Temperature-Pressure Relief Valve
AWARNING &WARNING
At the time of manufacturethis water heater was provid- The temperature-pressure relief valve must be manu-
ed with a combination temperature-pressuresrelief valve ally operated at least once a year. Caution should be
certified bya nationally recognizedtesting laboratorythat taken to ensure that (1) no one is in front of or
maintains periodic inspection of production of listed around the outlet of the temperature-pressure relief
equipment or materials, as meeting the requirementsfor valve discharge line, and (2) the water manually dis-
Relief Valvesand Automatic Gas Shutoff Devicesfor Hot charged will not cause any bodily injury or property
Water Supply Systems, and the latest edition of ANSI damage because the water may be extremely hot.
Z21.22 and the code requirements of ASME. If replaced, If after manually operating the valve, it fails to com-
the valve must meet the requirementsof local codes,but pletety reset and continues to release water, immedi-
not less than a combination temperature and pressure ately close the cold water inlet to the water heater,
relief valve certified as meeting the requirements for follow the draining instructions, and replace the
Relief Valvesand Automatic Gas Shutoff Devicesfor Hot temperature-pressure relief valve with a new one.
Water SupplySystems,ANSIZ21.22 by a nationally recog-
nizedtesting laboratory that maintainsperiodicinspection
of productionof listed equipment or materials.
The valve must be marked with a maximum set pressure
not to exceedthe marked hydrostaticworking pressureof SHUTOFF
the water heater (150 Ibs./sq.in.) and a dischargecapacity _ _r_VALVE
not lessthan the water heater input rate as shown on the , i<_ =__
model rating plate. (Electric heaters - watts divided by '_ _ '_
1000x 3415 equal BTU/Hr.rate.) HOT COLD
Your localjurisdictional authority, while mandating the
useof a temperature-pressurerelief valve complyingwith
ANSIZ21.22 and ASME, may requirea valve model differ-
ent from the one furnishedwith the water heater.
Compliancewith suchlocalrequirementsmustbe satisfied
by the installer or end user of the water heater with a -'
locally prescribed temperature-pressure relief valve
installedin the designatedopening in the water heater in _ _ TEMPERATURE-
placeof the factory furnished valve. \ PRESSURE
For safe operation of the water heater, the relief valve RELIEFVALVE
must not be removed from it's designated opening or
plugged. = DISCHARGEPIPE
The temperature-pressure relief valve must be installed (Donotcapor plug)
directly into the fitting of the water heater designatedfor
the relief valve. Positionthe valve downward and provide
tubing sothat any dischargewill exit only within 6 inches
above, or at any distance below the structural floor. Be
certain that no contact is made with any live electrical
part. The discharge opening must not be blocked or
reducedin size under any circumstances.Excessivelength,
over 30 feet, or use of more than four elbows can cause
restrictionand reducethe dischargecapacity of the valve.
No valve or other obstruction isto be placed between the _ _ _/ _6_AIRGAP
relief valveand the tank. Do not connecttubing directlyto _ ' 'm
dischargedrain unlessa 6" air gap isprovided. To prevent -- O FLOORDRAIN
bodily injury,hazardto life, or property damage, the relief
valve must be allowed to discharge water in quantities
shouldcircumstancesdemand. If the dischargepipe is not RELIEF VALVE OPENING
connectedto a drain or other suitable means, the water Atthetimeof manufacture,thiswaterheaterwasprovidedwithacombination
flow may causeproperty damage, temperature-pressurereliefvalvelistedascomplyingwiththestandardforrelief
The DischargePipe: valvesandautomaticgasshut-offdevicesforhotwatersupplysystems,ANSI
• Must not he smaller in size than the outlet pipe size of z21.22.Forsafeoperationofthewaterheater,thereliefvalvemustnotbe
removedfromitsdesignatedpointofinstallationorplugged.
the valve, or have any reducing couplings or other Yourlocalurisdictionalauthority, while mandatingtheuseof a temperature-
restrictions, pressurereliefvalvecomplyingwithANSIZ21.22andASME,mayrequireavalve
modeldifferentfromtheonefurnishedwiththewaterheater.
• Must not be plugged or blocked. Compliancewithsuchlocalrequirementsmustbesatisfiedbytheinstalleror
• Must beof materiallisted for hot water distribution, enduserof thewaterheaterwithalocallyprescribedtemperature-pressure
• Must be installed so as to allow complete drainage of reliefvalveinstalledinthedesignatedopeninginthewaterheater.
both the temperature-pressurerelief valve, and the dis- Seemanualheading-"Temperature-PressureReliefValves"forinstallationand
chargepipe. maintenanceofreliefvalve,dischargeline,andethersafetyprecautions, i
• Must terminate at an adequatedrain.
• Must not have any valve between the relief valve and
tank.
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