12
opening nor plugged. The temperature-pressure relief valve
must be installed directly into the fitting of the water heater
designed for the relief valve. Install discharge piping so that
any discharge will exit only within 12” (30.4 cm) above, or
external to the structure. Do not pipe the discharge to a
crawl space. 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.
No valve or other obstruction is to be placed between the relief
valve and the tank. Do not connect discharge piping directly
to the drain unless a 12” (30.4 cm) air gap is provided. To
prevent bodily injury, hazard to life, or property damage, the
relief valve must be allowed to discharge water in adequate
quantities should circumstances demand. If the discharge
pipe is not connected to a drain or other suitable means, the
water flow may cause property damage.
THE DISCHARGE PIPE:
•
Shall not be smaller in size than the outlet pipe size of the
valve, or have any reducing couplings or other restrictions.
•
Shall not be plugged or blocked.
•
Shall not be exposed to freezing temperatures.
•
Shall be of material listed for hot water distribution.
•
Shall be installed so as to allow complete drainage of
both the Temperature-Pressure Relief Valve and the
discharge pipe.
• Must terminate a maximum of 12” (30.4 cm) above a
floor drain or external to the building. In cold climates, it
is recommended that the discharge pipe be terminated
at an adequate drain inside the building.
•
Shall not have any valve or other obstruction between the
relief valve and the drain.
Water temperature over 125°F (52°C)
can cause severe burns instantly
resulting in severe injury or death.
Children, the elderly and the
physically or mentally disabled are at
highest risk for scald injury.
Feel water before bathing or
showering.
Temperature limiting devices such as
mixing valves must be installed
when required by codes and to
ensure safe temperatures at fixtures.
The temperature-pressure relief valve must be manually
operated at least once a year. Caution should be taken to
ensure that (1) 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
in this manual, and replace the temperature-pressure relief
valve with a properly rated/sized new one.
If you do not understand these instructions or have any
questions regarding the temperature-pressure relief valve call
the toll free number listed on the back cover of this manual for
technical assistance.
WATER LINE CONNECTIONS
This manual provides detailed piping installation diagrams (see
back section of this manual) for typical methods of application.
For the heater inlet and outlet connections, dielectric unions
are recommended. The water heater may be installed by
itself, or with a separate storage tank, on both single and two-
temperature systems. When used with a separate storage
tank, the circulation may be either by gravity or by means
of a circulating pump. When a circulating pump is used it is
important to note that the flow rate should be slow so that there
will be a minimum of turbulence inside the heater.
CLOSED WATER SYSTEMS
Water supply systems may, because of code requirements
or such conditions as high line pressure, among others, have
installed devices such as pressure reducing valves, check
valves, and back flow preventers. Devices such as these cause
the water system to be a closed system.
THERMAL EXPANSION
As water is heated, it expands (thermal expansion). In a closed
system the volume of water will grow when it is heated. As the
volume of water grows there will be a corresponding increase in
water pressure due to thermal expansion. Thermal expansion
can cause premature tank failure (leakage). This type of failure
is not covered under the limited warranty. Thermal expansion
can also cause intermittent temperature-pressure relief valve
operation: water discharged from the valve due to excessive
pressure build up. This condition is not covered under the
limited warranty. The temperature-pressure relief valve is not
intended for the constant relief of thermal expansion.
A properly sized thermal expansion tank must be installed on
all closed systems to control the harmful effects of thermal
expansion. Contact a local plumbing service agency to have
a thermal expansion tank installed.
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Summary of Contents for 52
Page 8: ...8 FEATURES AND COMPONENTS Figure 2 Electronic Control Modules Printed on 2 8 2018 9 05 AM CT...
Page 9: ...9 FEATURES AND COMPONENTS Figure 3 Surface Mount Control Models Printed on 2 8 2018 9 05 AM CT...
Page 52: ...52 Copyright 2017 All rights reserved www hotwater com Printed on 2 8 2018 9 05 AM CT...
