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Installation Instructions (cont'd)
Temperature-Pressure Relief Valve
AWARNING
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
periodic 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 050 Ibs./sq. in.) and a discharge capacity not
less than the water heater input rate as shown on the model
rating plate. (Electric heaters_, watts divided by I000 x 3415
equal BTU/Hr. rate.)
Your local jurisdictional authority, while mandating the useof
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
prescribed 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. Excessive length, over 15 feet, or use of more
than two elbows can cause restriction and reduce the dis-
charge capacity of the valve.
_o 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" 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 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 couplings or 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 relief valve and tank.
A WARNING
The temperature-pressure relief valve must be manually
operated at least once a year. Caution should be 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 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.
A WARNING
If a water heater is installed in conjunction with a sep-
arate storage vessel, the storage vessel must also be
equipped with a temperature-pressure relief valve
complying with the Standard for Relief Valves and Hot
Water Supply Systems, ANSI Z21.22. The hourly
rated temperature steam BTU discharge capacity of
the temperature-pressure relief valve(s) shall not be
less than the combined BTU input of the water
heater(s) supplying water to the storage vessel(s).
HOT
COLD
SHUTOFF
VALVE
PRESSURE
RELIEFVALVE
DISCHARGE PIPE
(Do not cap or plug)
RELIEF VALVEOPENING
At the time of manufacture, this water heater was providedwith a combinationtem-
perature-pressure relief valvelisted as complyingwith the standardfor relief valves
and automatic gas shut-off devicesfor hot water supply systems,ANSI Z21,22. For
safeoperarJonof the water heater, the relief valvemust not be removed from its des-
ignatedpoint of installationor plugged.
Yourlocal jurisdictional authorit7. while mandatingthe useof a temperauJre-pressure
relief valvecomplyingwith ANSI Z21.22 and ASHE, may require a valvemodel differ-
ent from the one furnished with the water heater
Compliancewith suchlocalrequirements mustbe satisfiedbythe installeror enduser
of the water heater with a Locagy prescribed temperature-pressure relief valve
installedin the designatedopeningin thewater heater
Seemanualheading-"Temperature-PressureRelief Valves"for installationand mainte-
nance ofrelief valve,dischargeline,and other sefeL7 precautions.
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