lp-770 Rev. 000 Rel. 000 Date 6.21.21
11
G. Domestic Piping Inlet
Dielectric fittings must be used on water connections.
Use both thread tape and pipe dope to connect an NPT female X
3/4” (minimum) pipe adapter. A shut-off valve between the city
water supply and tank inlet is recommended for ease of service.
If the tank is replacing a tankless coil in the boiler, disconnect coil
plumbing and use the cold inlet pipe and hot water outlet pipes for
the water heater.
NOTE:
DO NOT PLUG OUTLET IN TANKLESS COIL.
Exercise caution when soldering water heater connections, as
outlet and inlet dip tubes are plastic.
H. Temperature and Pressure Relief Valve
A factory installed temperature and pressure long element relief
valve, meeting the requirements for relief valves for water heaters
(ANSI Z21.22 / CSA 4.4) has been installed for your safety and
convenience. If servicing, make sure that the relief valve is sized to
the BTU/hour capacity and storage capacity of the water heater. If
the relief valve weeps see expansion tank section for details.
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
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 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 heater “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
discharged 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.