Temperature-Pressure Relief Valve - Lochinvar LTN07575 Instruction Manual

FIGURE 10. TYPICAL PIPING ARRANGEMENT
Note: To protect against untimely corrosion of hot and
cold water fittings, it is strongly recommended that
dielectric unions or couplings be installed on this water
heater when connected to copper pipe.
shows the typical attachment of the water
Figure 10
piping to the water heater. The water heater is equipped
with 1" NPT threaded nipple (75 gallon nominal capacity
models) or 1.25" NPT threaded nipple (100 gallon
nominal capacity models) water connections.

TEMPERATURE-PRESSURE RELIEF VALVE

This water heater is provided with a properly rated/
sized and certified combination temperature-pressure
relief valve (T&P valve) by the manufacturer. The valve
is certified by a nationally recognized testing laboratory
that maintains periodic inspection of production of listed
equipment of materials as meeting the requirements for
relief valves for hot water supply systems,
, and the code requirements of ASME. If replaced,
CSA 4.4
the new T&P valve must meet the requirements of local
codes, but not less than a combination temperature-
pressure relief valve rated/sized and certified as indicated
in the above paragraph. The new valve must be marked
with a maximum set pressure not to exceed the marked
hydrostatic working pressure of the water heater (150
psi = 1,035 kPa) and a discharge capacity not less than
the water heater Btu/hr or kW input rate as shown on the
water heater's model rating label.
Note: In addition to the factory installed
temperature-pressure relief valve on the water heater,
each remote storage tank that may be installed and
piped to a water heating appliance must also have its
own properly sized, rated, and approved temperature-
pressure relief valve installed. Call the toll free technical
support phone number listed on the back cover of this
manual for technical assistance in sizing a temperature-
pressure relief valve for remote storage tanks.
For safe operation of the water heater, the temperature-
pressure relief valve must not be removed from its
designated opening nor plugged. The temperature-
pressure relief valve must be installed directly into the
fitting of the water heater designed for the relief valve.
Install discharge piping so that any discharge will exit
the pipe within 6 inches (15.2 cm) above an adequate
floor drain, or external to the building. In cold climates
it is recommended that it be terminated at an adequate
drain inside the building. Be certain that no contact is
made with any live electrical part. The discharge opening
must not be blocked or reduced in size under any
circumstances. Excessive length, over 30 feet (9.14 m),
or the use of more than four elbows can cause restriction
and reduce the discharge capacity of the valve.
14
ANSI Z21.22 •