Thermal Expansion; Condensation; Temperature And Pressure Relief Valve - HTP Everlast 2.5 Manual De Uso Y Cuidado

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• Connect the cold water inlet pipe to the inlet tapping (marked with a blue ring).
• Ensure an isolation valve is installed on the cold water supply to the water heater.
• Connect the hot water outlet pipe to the outlet tapping (marked with a red ring).
Do not apply heat to the Hot or Cold water heater connections. If sweat connections are used, sweat tubing to
the adapter before fi tting adapter to the water connections on the heater. Any heat applied to the water heater
connections will permanently damage the dip tube and/or heat traps. Damages due to improper installation
practices ARE NOT covered by warranty.
Failure of electric elements due to lime scale build-up on the heating surface, low pH, or other imbalance IS NOT
covered by the warranty.
C. Thermal Expansion
A check valve may be installed in the cold water inlet line as a separate backfl ow preventer, or may be part of
a pressure reducing valve, water meter, or water softener. An "open water system" refers to a system without a
check valve. A "closed water system" refers to a system with a check valve installed in the cold water inlet line.
As water is heated, it expands in volume and increases pressure within the water system. This action is referred
to as "thermal expansion". In an open water system, expanding water which exceeds the capacity of the system
fl ows back into the city main where pressure is easily dissipated.
A closed water system prevents expanding water from fl owing back to the city main. The resulting thermal
expansion can rapidly increase pressure in the water heater and system piping. This rapid pressure increase
can exceed the setting of the pressure relief valve, causing it to operate during each heating cycle, resulting
in discharge from the T&P. This rapid and repeated expansion and contraction of components in the system
can cause premature failure of system components, including the relief valve and possibly the water heater.
Replacing the relief valve will not correct thermal expansion.
There are two recommendations to prevent this from happening:
1. Install a potable diaphragm-type hot water expansion tank to off set thermal expansion. Expansion tanks
are designed with an air cushion built in that compresses as system pressure increases, thereby relieving the
overpressure condition and eliminating repeated operation of the relief valve. This expansion tank should be
installed in the cold water line between the water heater and check valve, and must be sized for the entire water
volume of the hot water system. The expansion tank must have a minimum capacity of 1.5 gallons for every 50
gallons of stored water.
2. Install a 125 PSI pressure relief valve in the cold water supply line. Make sure the discharge of this valve is
directed to an open drain and protected from freezing. Contact the local water supplier or plumbing inspector
for information on how to control this situation. Do not plug the temperature and pressure relief valve.
Other methods of controlling thermal expansion are available. Check with the local water utility to determine
if a check valve exists in the cold water inlet line. Contact your installing contractor, water supplier, or
plumbing inspector for additional information regarding thermal expansion.
D. Condensation
Condensation can form on the water heater when it is fi rst fi lled with water, and may also occur with a heavy
water draw and very cold inlet water temperature. This condition is not unusual and will disappear as the water
becomes heated. However, if the condensation should continue, examine the piping and fi ttings for possible
leaks.
NOTE: Insulating both the cold water inlet and hot water outlet pipes will reduce the opportunity for condensation
on the water heater piping.
E. Temperature and Pressure Relief Valve
For protection against excessive pressures and temperatures in this water heater, install the supplied temperature
and pressure relief valve certifi ed by a nationally recognized testing laboratory that maintains periodic inspection
of production listed equipment or materials, as meeting the requirements for Relief Valves and Automatic Gas
Shutoff Devices for Hot Water Supply Systems, ANSI Z21.22B / CSA 4.4-M99. The supplied temperature and pressure
relief valve is marked with a maximum set pressure (150 psi) that does not exceed the marked maximum working
pressure of the water heater (150 psi). Install the T&P valve in the opening provided and marked for this purpose
on the water heater, and orient it or provide tubing so that any discharge from the valve will exit at least 6" above
the structural fl oor. The relief line cannot be in contact with any live electrical parts. The discharge opening must
not be blocked or reduced in size under any circumstances.
National Plumbing codes require a drain pan for any water heater installation. Failure to install one is the sole
responsibility of owner and/or installer. Reference UPC 2000 (Uniform Plumbing Code) Section 510 - Protection
from Damage or IPC 200 (International Plumbing code) Section 504 - Safety Devices.
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