Installation Guide

15
WATER PIPING PRESSURE TEST
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This section is only for the manufacturer installing the water heater
when the installation is to comply with H.U.D. standards.
When testing the waterways, H.U.D. standards state:
“Water Distribution System: All water piping in the water distribution
system shall be subjected to a pressure test. The test shall be made
by subjecting the system to air or water at 100 psi (689.48 kPa) for
15 minutes without loss of pressure. When air pressure is used,
the water heater shall not be connected during the test.”
NOTE: If water piping system is to be air pressure tested, the water
heater must be disconnected from the water piping system. Failure
to disconnect the water heater during air pressure testing of water
piping system could result IN DEATH, SERIOUS BODILY INJURY,
OR PROPERTY DAMAGE.
FIGURE 24.
TEMPERATURE-PRESSURE RELIEF VALVE
Explosion Hazard
 Temperature-pressure relief
valve must comply with ANSI
Z21.22-CSA 4.4 and ASME code.
 Properly sized temperature-
pressure relief valve must be
installed in opening provided.
 Do not plug, block, or cap the
discharge line.
 Failure to follow this warning
can result in excessive tank
pressure, serious injury or
death.
This heater is provided with a properly certified combination
temperature - pressure relief valve by the manufacturer.
The valve is certifi ed by a nationally recognized testing laboratory
that maintains periodic inspection of production of listed equipment
of materials as meeting the requirements for Relief Valves and
Automatic Gas Shut-off Devices for Hot Water Supply Systems, ANSI
Z21.22 • CSA 4.4, 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
certifi ed as indicated in the above paragraph.
The valve must be marked with a maximum set pressure not to
exceed the marked hydrostatic working pressure of the water heater
(150 psi = 1,035 kPa) and a discharge capacity not less than the
water heater input rate as shown on the model rating plate.
For safe operation of the water heater, the relief valve must not be
removed from its designated opening nor plugged.
The temperature-pressure relief valve must be installed directly into
the fi tting of the water heater designed for the relief valve. Position
the valve downward and provide tubing so that any discharge will exit
only at any distance below the structural fl oor. 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 (9.14 m), or use of more than four
elbows can cause restriction and reduce the discharge capacity of
the valve. See Figure 25.
No valve or other obstruction is to be placed between the relief valve
and the tank. 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 connected to a drain or other suitable means, the water fl ow may
cause property damage.