Reliant FVIR GAS WATER HEATER Betriebsanleitung Seite 9

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9
Thermal Expansion
Determine if a check valve exists in the
inlet water line. Check with your local
water utility company. It may have been
installed in the cold water line as a separate
back flow preventer, or it may be part of
a pressure reducing valve, water meter or
water softener. A check valve located in
the cold water inlet line can cause what is
referred to as a “closed water system”. A
cold water inlet line with no check valve or
back flow prevention device is referred to
as an “open” water system.
As water is heated, it expands in volume
and creates an increase in the 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 water
heater flows back into the city main where
the pressure is easily dissipated.
A “closed water system”, however,
prevents the expanding water from flowing
back into the main supply line, and the
result of “thermal expansion” can create
a rapid and dangerous pressure increase in
the water heater and system piping. This
rapid pressure increase can quickly reach
the safety setting of the relief valve, causing
it to operate during each heating cycle.
Thermal expansion, and the resulting rapid,
and repeated expansion and contraction of
components in the water heater and piping
system can cause premature failure of the
relief valve, and possibly the heater itself.
Replacing the relief valve will not correct
the problem!
The suggested method of controlling
thermal expansion is to install an expansion
tank in the cold water line between the
water heater and the
check valve (see
illustration below). The expansion tank
is designed with an air cushion built in
that compresses as the system pressure
increases, thereby relieving the over
pressure condition and eliminating the
repeated operation of the relief valve.
Other methods of controlling thermal
expansion are also available. Contact
your installing contractor, water supplier
or plumbing inspector for additional
information regarding this subject.
Typical Installation
Heat trap 6” minimum
Heat trap 6” minimum
Union
To gas supply
Sediment trap
Cap
Ground joint union
Drain Pan Pipe to suitable drain.
Relief valve discharge
line to suitable open
drain.
To cold water supply
6” Air gap
Draft hood
Pitch up 1/4” per foot
Auxiliary catch pan
Union
Anode
Manual gas shut-off
Thermostatic gas valve
Jacket door
Temperature and
pressure relief valve
Refer to the illustration below for
suggested typical installation. The
installation of unions or flexible copper
connectors is recommended on the hot
and cold water connections so that the
water heater may be easily disconnected
for servicing if necessary. The HOT and
COLD water connections are clearly
marked and are 3/4” NPT on all models.
Install a shut-off valve in the cold water
line near the water heater.
Water Supply Connections
IMPORTANT: DO
NOT apply heat to the
HOT or COLD water
connections. If sweat
connections are used,
sweat tubing to adapter
before fitting adapter
to the cold water
connections on heater.
Any heat applied
to the cold water
supply fittings will
permanently damage
the dip tube and the
heat traps in the hot/
cold nipples.
Shut-off valve
Shut-off valve
Thermal expansion tank
(if required)
NOTICE: The
National Fuel Gas
Code (NFGC)
mandates a manual
gas shut-off valve:
See (NFGC)
for complete
instructions.
Local codes or
plumbing authority
requirements
may vary from
the instructions
or diagrams
provided and take
precedent over these
instructions.
Combustion Air
Inlet Openings
Hot water outlet
to fixtures
Water Heater Jacket
Vent connector to
chimney
Drain valve
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