Heater Plumbing; Auxiliary Connections; Backflow Preventer; Potable Expansion Tank - Westinghouse WGR-076 Series Installation, Start-Up, Maintenance, Parts, Warranty

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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.
A. Heater Plumbing
Use two wrenches when tightening water piping at heater. Use
one wrench to prevent the heater return or supply line from
turning. Failure to prevent piping connections from turning
could cause damage to heater components.
The heater control module uses temperature sensors to provide
both high limit protection and modulating temperature control.
The control module also provides low water protection by
sensing the water level in the tank. Some codes / jurisdictions
may require additional external controls.
Installing the Optional High Output Cold Water Dip Tube - For
longer hot water draw, remove the factory installed dip tube
from the cold water inlet and replace with the Optional High
Output Cold Water Dip Tube. This can be done by hand.
The domestic water connections must be installed in accordance
to all local and national plumbing codes, or any applicable
standard which prevails. The inlet (cold) and outlet (hot) ports
are 3/4" on all models.
It is recommended to install a sweat shut-off valve and a union
in the cold inlet piping and hot outlet to ease future servicing. If
there is a backflow preventer or any type of a no return valve in
the system, install an additional tee here, suitable for a potable
hot water expansion tank.
In the hot outlet, install a suitable adapter to match the copper
tubing of the plumbing system. A thermal trap or heat trap loop
may be installed here to provide additional energy savings and
prevent the thermal siphoning of domestic hot water.
B. Auxiliary Connections
The auxiliary connections are additional connections for a
recirculation connection, air handlers, plate exchangers, or
other devices that supply hot water. These connections must be
installed in accordance with all local and national codes or any
applicable standard that prevails. Auxiliary connections are 3/4"
on all models. Never use dielectric unions or galvanized steel
fittings. Use only copper or brass fittings. Sealant must be used
on all connections.
Never connect auxiliary connections to any system that uses
glycol or other solutions formulated for hydronic systems.
These auxiliary connections are to be used only in a potable
water system. Failure to follow this warning could result in
serious injury or death.
C. Backflow Preventer
Use a backflow preventer specifically designed for water heater
installations. This valve should be installed on the cold water fill
WHL-001 Rev. 3.16.15
supply line per local codes.
D. Potable Expansion Tank
A potable hot water expansion tank is required to offset
heated water expansion. In most city plumbing systems, the
water meter has a no return or back flow device built into
the system to prevent back flowing of water into city mains.
Some local codes require back flow preventers on all incoming
water supplies. The hot water expansion tank must be listed
for potable water use. The expansion tank should be located
on the cold inlet piping close to the water heater.
Expansion Tank and Make-Up Water
1. Ensure that the expansion tank is sized to correctly handle
heater and system water volume and temperature.
Undersized expansion tanks cause system water to be lost
from the relief valve, causing make-up water to be added.
Eventual heater failure can result due to excessive make-
up water addition. SUCH FAILURE IS NOT COVERED BY
WARRANTY.
The expansion tank must be suitable for hot potable water
systems.
2. The expansion tank must be located as shown in
Applications, this manual, or following recognized design
methods. See expansion tank manufacturer's instructions for
details.
E. Temperature and Pressure Relief Valve
Overheated water and high pressures can cause water tank
explosion. A properly sized temperature and pressure relief
valve must be installed in the opening provided on the water
heater. Failure to install a properly sized temperature and
pressure relief valve could result in explosion and property
damage, serious injury, or death.
To avoid water damage or scalding due to relief valve
operation:
• Discharge line must be connected to relief valve outlet
and run to a safe place of disposal. Terminate the
discharge line in a manner that will prevent possibility
of severe burns or property damage should the relief
valve discharge.
• Discharge line must be as short as possible and
the same size as the valve discharge connection
throughout its entire length.
• Discharge line must pitch downward from the valve
and terminate at least 6" above the floor drain, making
discharge clearly visible.
• The discharge line shall terminate plain, not threaded,
with a material serviceable for temperatures of 375
or greater.
• Do not pipe discharge to any location where freezing
could occur.
• No valve may be installed between the relief valve and
heater or in the discharge line. Do not plug or place
any obstruction in the discharge line.
• Test the operation of the relief valve after filling and
pressurizing the system by lifting the lever. Make sure
the valve discharges freely. If the valve fails to operate
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