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Installation
Instructions
(cont'd)
Temperature-Pressure
Relief Valve
_,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 less than 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 (150 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 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
brescribed 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 30 feet, or use of more
than four elbows can cause restriction
and reduce the dis-
charge 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" 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.
AWARNING
The temperaturo-pressure
relief valve must be manually
operated at least once a year. Caution should be taken to
ensure that (|) 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
i
valve with a new one.
HOT
SHUTOFF
VALVE
COLD
PRESSURE
RELIEF VALVE
[]
-DISCHARGE
PIPE
(Do not cap or plug)
6" AIR GAP
FLOOR DRAIN
RELIEFVALVEOPENING
At the time of manufacture, this water heater was provided with a combination tem-
perature-pressure Telief_aNe gsted as cornpl_ng with the s_andardfor relief vanes and
automatic gas shut-off devices for hot water supply systems, ANSI Z21.22. For safe
operation of the water heate_ the relief valve must not be removed from its designated
point of installation or plugged.
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 of end user
of the water heater with a locallyprescribed temperature-pressure relief valveinstalled
in the designated opening in t_ water he_er.
See manual heading ."Temperature.Pressure Relief Valves" for installation and mainte-
nance of relief valve, discharge line, and other safety precautions.
12
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