LP-314 Rev. 012 Rel. 003 Date 9.27.19
14
Mixing Valve Maintenance and Service
• It is recommended to check the mixing valve annually to
ensure proper system capabilities. More frequent checks are
recommended in adverse water conditions.
• When checking the mixed water supply temperature, use
the same faucet used in the initial installation temperature
adjustment.
• There may be some variation in the water temperature from
the mixing valve due to seasonal temperature variations in the
cold water supply.
If the water supply is of poor quality, the internal components
may jam, requiring an additional filter or strainer to be fitted to
the system. Contact a plumbing professional for appropriate
materials and installation.
D. 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 1” on all models. Never use dielectric unions
or galvanized steel fittings. Use only copper or brass fittings. Sealant
must be used on all connections. The top port is the outlet and the
bottom port is the inlet.
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.
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 appliance. Failure
to install a properly sized temperature and pressure relief valve could
result in explosion and property damage, serious injury, or death.
E. Temperature and Pressure Relief Valve for DHW
Install a temperature and pressure relief valve into the marked port
(upper right). We recommend a WATTS 40XL5 valve or equivalent
for 130,000 BTU models or above input. The valve must meet the
ANSI Z21.22B requirements for relief valves for hot water heaters as
per a nationally recognized lab that maintains a periodic inspection
of production of such listed safety device. The pressure rating of the
valve must not exceed the listed working pressure of this appliance,
and must be rated to the proper BTU/hr capacity of the appliance.
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
o
F or greater.
•
Do not pipe discharge to any location where freezing could
occur.
•
No valve may be installed between the relief valve and
appliance 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 correctly,
immediately replace with a new properly rated relief valve.
•
Test T&P valve at least once annually to ensure the waterway
is clear. If valve does not operate, turn the appliance “off”
and call a plumber immediately.
•
Take care whenever operating relief valve to avoid scalding
injury or property damage.
FAILURE TO COMPLY WITH THE ABOVE GUIDELINES COULD
RESULT IN FAILURE OF RELIEF VALVE OPERATION, RESULTING
IN POSSIBILITY OF SUBSTANTIAL PROPERTY DAMAGE, SEVERE
PERSONAL INJURY, OR DEATH.
Do not thread a cap or plug into the relief valve or relief valve line
under any circumstances! Explosion and property damage, serious
injury, or death may result.
RE-INSPECTION OF T&P RELIEF VALVES: T&P valves should be
inspected AT LEAST ONCE EVERY THREE YEARS, and replaced if
necessary,
by a licensed plumbing contractor or qualified service
technician to ensure that the product has not been affected
by corrosive water conditions and to ensure that the valve and
discharge line have not been altered or tampered with illegally.
Certain naturally occuring conditions may corrode the valve and
its components over time, rendering the valve inoperative. Such
conditions can only be detected if the valve and its components are
physically removed and inspected.
Do not attempt to conduct an
inspection on your own.
Contact your plumbing contractor for a
re-inspection to assure continued safety.
FAILURE TO RE-INSPECT THE T&P VALVE AS DIRECTED COULD
RESULT IN UNSAFE TEMPERATURE AND/OR PRESSURE BUILD-UP
WHICH CAN RESULT IN PROPERTY DAMAGE, SERIOUS PERSONAL
INJURY, OR DEATH.
F. Backflow Preventer
Use a backflow preventer specifically designed for water heater
installations. This valve should be installed on the cold water fill
supply line per local codes.
G. 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 appliance.
Expansion Tank and Make-Up Water
1. Ensure that the expansion tank is sized to correctly handle
appliance 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
appliance 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.
Failure to follow the instructions in this section WILL VOID the
warranty and may result in property damage, serious personal
injury, or death.
