Water Heater User Manual

Installation Instructions (cont'd)
Temperature-Pressure
Relief Valve
AWARNING
At the time of manufacturethis water heater wasprovided
with a combinationtemperature-pressuresrelief valve cer-
tified by a nationally recognized testing laboratory that
maintainsperiodic inspectionof productionof listedequip-
ment or materials, as meeting the requirements for Relief
Valvesand Automatic Gas Shutoff Devicesfor Hot Water
SupplySystems,and the latest edition of ANSI Z21.22 and
the code requirements of ASME. If replaced, the valve
must meet the requirements of local codes,but not less
than a combination temperature and pressurerelief valve
certified asmeeting the requirements for ReliefValvesand
Automatic Gas Shutoff Devices for Hot Water Supply
Systems,ANSI Z21.22 by a nationally recognized testing
laboratory that maintainsperiodicinspectionof production
oflistedequipment or materials.
The valve must be marked with a maximum set pressure
not to exceed the marked hydrostaticworking pressureof
the water heater (150 Ibs./sq.in.) and a dischargecapacity
not lessthan the water heater input rate as shownon the
model rating plate. (Electric heaters - watts divided by
1000x 3415 equal BTU/Hr. rate.)
Yourlocaljurisdictionalauthority, while mandatingthe use
of a temperature-pressure relief valve complying with
ANSI Z21.22 and ASME, may require a valve model differ-
entfrom the onefurnishedwith the water heater.
Compliancewith suchlocalrequirements must be satisfied
_)ythe installer or end user of the water heater with a
locally prescribed temperature-pressure relief valve
installedin the designatedopening in the water heater in
placeof the factory furnishedvalve.
For safe operation of the water heater, the relief valve
must not be removed from it's designated opening or
plugged.
The temperature-pressure relief valve must be installed
directly into the fitting of the water heater designatedfor
the relief valve. Positionthe valve downward and provide
tubingso that any dischargewill exit only within 6 inches
above,or at any distancebelowthe structuralfloor.Becer-
tein that no contact is made with any llve electrical part.
The dischargeopeningmust not be blockedor reduced in
size under any circumstances. Excessivelength, over 30
feet, or useof more than four elbowscan causerestriction
andreduce the dischargecapacityofthe valve.
No valveor other obstruction is to be placed between the
relief valve and the tank. Do not connecttubing directly to
dischargedrain unlessa 6" air gap is provided. To prevent
bodilyinjury,hazard to life,or property damage, the relief
valve must be allowed to discharge water in quantities
shouldcircumstancesdemand. If the dischargepipe is not
connected to a drain or other suitable means, the water
flowmay causeproperty damage.
The DischargePipe:
Must not be smaller in size than the outlet pipe size of
the valve, or have any reducing couplings or other
restriction.
Must not bepluggedor blocked.
Mustbe of material listedfor hot water distribution.
Must be installed so as to allow complete drainage of
both the temperature-pressure relief valve, andthe dis-
chargepipe.
Must terminate at an adequatedrain.
Must not have any valve between the relief valve and
tank.
_,WARNING
The temperature-pressure relief valve must be manually
operated at least once a year.Caution shouldbe taken to
ensure that (I) no one is in front of or around the outlet
of the temperature-pressure relief valve discharge line,
and (2) the water manually dischargedwill not causeany
bodily injury or property damage becausethe water may
be extremely hot.
If after manuallyoperating the valve, it failsto completely
reset and continues to release water, immediately, close
the cold water inlet to the water heater, follow the drain-
ing instructions, and replace the temperature-pressure
relief valvewith a new one.
HOT
HOT
COLD
F_E-
PRESSURE
RELIEF VALVE
PIPE
(Do not cap or plug)
6" AIR GAP
FLOOR IN
T&P RELIEF
VALVE PROBE
TEMPERATURE-
PRESSURE
RELIEF VALVE
T&P
SHANK
NIPPLE 'LENGTH
• if a shorlshank (lessthan 2") temperature-pressulete_f valve isto be installed
(as shown),a nippleand couplin9 must be used¸
• Ffa longshank(2' or longer)isto be installed,do not use1henippleand coupling¸
lnstamTeroperature-Pr_ssureprotective_quipmentrequired by localcodes, butnot less Ihan a r_na-
t_onTemperature-PressureRelief Valvecettitiedas meeting the requirementsforReliefVetves and
AulomaticGasShutoffDev_.esforHol-WaterSupprySystems,ANS Z2122 bya natw_naltyre(_gn_edlesl-
inglabo_alOr/t_l maintainspeded_wv,pecti_ of prod_ct_noflistedequigrnentormaterials.The val_
mustbe onented,pTOVi_dwithlub_ng,oro_hen_memetailedsothatdr,ct_r;e canexil orgywtlhin6 red'as
above,or atanydslanCebelowlhe structuralIk_or,andcan,w_tcOnlaclanylive e_,cl_a!pall"
For_le operatK,n ofIhewaterheater¸theReEf Vave mustnotbe removedorplugged¸ f
S_BrP_nL_I_leading. "TemperatUfe. p[assureRelief Valve"for insta_al_Onand mai_lenaflceof Relie
Va)ve,diSChargeppe andothersafetyprecautions¸