HTP EVR 040, Инструкция по использованию и уходу, Страница: 8 / 22

8
PART 3 – HEATER PIPING
A. PLUMBING
It is mandatory that all plumbing be done in accordance with federal, local, and state plumbing codes and practices. Failure to properly
install the water heater WILL VOID the warranty. It is also necessary to use both thread tape and pipe dope on all mechanical plumbing
connections.
Use unions on the hot and cold water connections, so that the heater may be easily disconnected for servicing when necessary.
Dielectric unions or galvanized steel fittings must not be used in a system with this water heater. Doing so WILL VOID the warranty.
Use only copper, brass, or stainless steel fittings. Teflon thread sealant must be used on all connections.
1. Connect co
ld water line to the connection marked “COLD” on the top of the water heater.
Do not apply heat to the Hot or Cold water heater connections. If sweat connections are used, sweat tubing to the adapter before fitting
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.
2. Connect hot water line to the
connection marked “HOT” on the top of the heater.
3. An opening is provided near the top of the heater for installation of a Temperature and Pressure Relief Valve (T&P Valve).
B. THERMAL EXPANSION
A check valve may be installed in the cold water inlet line as a separate backflow 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 flows back into the city main where
pressure is easily dissipated.
A closed water system prevents expanding water from flowing back into 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 safety setting of the relief valve,
causing it to operate during each heating cycle. 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.
A potable hot water expansion tank is required to offset 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 the check valve, and must be
sized for the entire water volume of the hot water system. See Figure 3.
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.
C. CONDENSATION
Condensation can form on the water heater when it is first filled 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 fittings for possible leaks.
D. INSULATION BLANKETS
Insulation blankets for external use on electric water heaters are not necessary with this water heater. An insulation blanket is meant to
reduce the standby heat loss encountered with storage tank heaters. This water heater meets or exceeds National Appliance Energy
Conservation Act standards with respect to insulation and energy factor requirements, thus making an insulation blanket unnecessary.
The manufacturer’s warranty does not cover any damage or defect caused by installation, attachment, or use of any type of energy
saving or other unapproved devices (other than those authorized by the manufacturer) into, onto, or in conjunction with the water
heater. The use of unauthorized energy saving devices may shorten the life of the water heater and endanger life and property. The
manufacturer disclaims any responsibility for any losses or injuries resulting from the use of such unauthorized devices.