American Standard Standard Residential, Operating, Installation And Service Manual

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For protection against excessive pressures and/or temperatures, a temperature and pressure relief valve must be installed in
the opening marked, “temperature and pressure relief valve”. A design certified by a nationally recognized testing laboratory
that maintains periodic inspection of production of listed equipment or materials, as meeting the requirements for Relief
Valves and Automatic Gas Shut-Off Devices for Hot Water Supply Systems, Z21.22 is furnished with this water heater.
Do not thread, cap, or plug the end of this discharge line. Do not connect discharge line directly to drain.
(Figure 4)
To prevent boduly injury, hazard to life or damage to property, the relief valve must be allowed to discharge water in the
event of excessive temperature or pressure developing in the water heater.
The function of the temperature and pressure relief valve is to discharge water in large quantities should circumstances
demand. If the discharge pipe is not directed to the drain, as shown in Figure 4, or other suitable means, the water flow may
cause property damage.
THE DISCHARGE LINE
(1) Must not be smaller than the pipe size of the relief valve.
(2) Must not be plugged or blocked.
(3) Must be of material capable of withstanding 210ºF without distortion.
(4) Must be installed so as to allow complete drainage of both the
temperature and pressure relief valve and discharge line.
(5) Must terminate at an adequate drain.
(6) Must not have any valve between the relief valve and the heater.
Failure to maintain the properly listed temperature and pressure relief valve will
release the manufacturer from any claims which might result from excessive
temperature or water pressure.
T&P RELIEF VALVE INSULATION
T&P RELIEF VALVE
DRAIN LINE
T&P RELIEF VALVE
MANUAL RELIEF
LEVER
T&P RELIEF VALVE INSULATION
WARNING: Do not attempt to operate this water
heater with cold water inlet valve closed.
Manually operate the temperature and pressure relief valve at least once a year (
Figure 10)
. To prevent water damage,
discharge line must terminate at an adequiate drain.
(Figure 4).
Standing clear of the outlet
(discharge water may be hot)
, lift and realase the handle on the temperature and pressure relief valve
to make the valve operate freely. If the heater is installed in a closed system , the temperature and pressure relief valve may
drip at times. If the temperature and pressure relief valve discharges a full stream of water, have the system checked. See
“Pressure Build-Up in Water System”.
If the temperature and pressure relief valve on the appliance discharges periodically, this may be duel to thermal expansion
in a closed water supply system
(see “Pressure Buidl-Up in Water System”).
Contact the water supplier or local plumbing inspector
on how to correct this situation. Do not plug the temperature and pressure relief valve.
TEMPERATURE
& PRESSURE RELIEF VALVE