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Temperature-Pressure Relief Valve
(cont'd)
_WARNING
At the time of manufacture this water heater was provided
with a combination temperature-pressures relief valve certi-
fied by a nationally recognized testing laboratory that main-
tains periodic inspection of production of listed equipment or
materials, as meeting the requirements for Relief Valves and
Automatic Gas Shutoff Devices for Hot Water Supply
Systems, 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 lessthan a combination
temperature and pressure relief valve certified as meeting
the requirements for Relief Valves and Automatic Gas
Shutoff Devices for Hot Water Supply Systems, ANSI Z21.22
by a nationally recognized testing laboratory that maintains
_eriodic inspection of production of listed equipment or
materials.
The valve must be marked with a maximum set pressure not
to exceed the marked hydrostatic working pressure of the
water heater (150 Ibs./sq. in.) and a discharge capacity not
lessthan the water heater input rate as shown on the model
rating plate. (Electric heaters - watts divided by 1000 x 3415
equal BTU/Hr. rate.)
Your local jurisdictional authority, while mandating the use of
a temperature-pressure relief valve complying with ANSI
Z21.22 and ASME, may require a valve model different from
the one furnished with the water heater.
Compliance with such local requirements must be satisfied
by the installer or end user of the water heater with a locally
)rescribed temperature-pressure relief valve installed in the
designated opening in the water heater in place of the facto-
ry furnished valve.
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 designated for the
relief valve. Position the valve downward and provide tubing
so that any discharge will 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 reduced in size under any
circumstances. Excessivelength, over 30 feet, or use of more
than four elbows can cause restriction and reduce the dis-
charge capacity ofthe valve.
No valve or other obstruction is to be placed between the
relief valve and the tank. Do nut connect tubing directly to
discharge drain unless a 6" air gap is provided. To prevent
bodily injury, hazard to life, or property damage, the relief
valve must be allowed to dischargewater in quantities should
circumstances demand. If the discharge pipe is not connect-
ed to a drain or other suitable means, the water flow may
cause property damage.
The Discharge Pipe:
• Must not be smaller in size than the outlet pipe size of the
valve, or have any reducing couplingsor other restrictions.
• Must not be plugged or blocked.
• Must be of material listed for hot water distribution.
° Must be installed so as to allow complete drainage of both
the temperature-pressure relief valve, and the discharge
pipe.
, Must terminate at an adequate drain.
, Must not have any valve between the retlef vane and tank.
AWARNING
The temperature-pressure relief valve must be manually
operated at least once a year. Caution should be taken to
ensure that (I) no one isin 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.
HOT
SHUTOFF
VALVE
COLD
HOT COLD
F-- T E_II_s_RUER E-
RELIEF VALVE
_ DISCHARGE PiPE
(Do no_capor plug)
6" AIR GAP
FLOOR DP,_IN_ f
RELIEFVALVEOPENING
At the time ot manufacture, this water heater wasprovided with a combination tem-
perature-pressure relief vaIvelisted ascomplyingwitl_ the standard for relief valvesand
automatic gas shut-off devices for hot water supply syssems,ANSI Z2L22. For safe
operationof thewaterheater,thereliefvalvemustnotberemovedfromitsdesignated
point of installation or plugged.
Yourlocaljurisdictionalauthority,while mandatingthe useofa temperature-pressure
relief valvecomplying with ANSI Z2 I_22 andASME,may require avalve model different
from the onefurnished with the water heate_
Compliance with suchlocal requirements must besatisfied by the installer or end user ....
of the water heater with a locally prescribed temperature-pressure relief valveinsmlle_
in the designated opening in the water heater.
Seemanual heading -"Temperature-Pressure Relief Vafves'_for installation and mainte- I
nanceof relief valve,discharge line, andother safetyprecautions,
I
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