Water Line Connections; T&P Valve Discharge Pipe - State Water Heaters 301 Series Instruction Manual

WATER LINE CONNECTIONS

The water piping installation must conform to these instructions
and to all local and national code authority having jurisdiction.
Good practice requires that all heavy piping be supported.
Read and observe all requirements in the following sections before
installation of the water piping begins:
1. (page 14).
Mixing Valves
2. (page 14).
Dish-washing Machines
3.
Temperature-Pressure Relief Valve
4. and
Thermal Expansion Closed Water Systems
5. For multiple water heater installations see
(page 69).
WATER PIPING DIAGRAMS
This manual provides detailed water piping diagrams for typical
methods of application for the water heaters, see
(page 69).
Diagrams
The water heater may be installed with or without a separate
storage tank. When used with a separate storage tank, the
circulation may be either by gravity or by means of a circulating
pump.
Note: When a circulating pump is used, t
be slow so that there will be a minimum of turbulence
inside the water heater storage tank.
Adjust flow by throttling a full port ball valve installed in the
circulating line on the outlet side of the pump. Never throttle
flow on the suction side of a pump. See the
(page 69).
Note: In addition to the factory installed Temperature-
Pressure Relief valve (T&P 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 further assistance in sizing a T&P
valve for remote storage tanks.
THERMOMETERS (NOT SUPPLIED)
Thermometers are installed in the water piping system as a
means of detecting the temperature of the hot water supply at
critical points in the system. Field-supplied thermometers should
be obtained and installed. See
WATER (POTABLE) HEATING AND SPACE HEATING
1. All water piping components connected to the water heater
that are for space heating applications shall be suitable for use
with potable water.
2. Toxic chemicals, such as those used for boiler treatment, must
NEVER be introduced into this system.
3. The water heaters covered in this manual may never be
connected to any existing heating system or component(s)
previously used with non-potable water heating appliance.
4. When the system requires water for space heating that exceed
safe temperatures at domestic water fixtures a mixing valve
must be installed. See
Mixing Valves
Note: Malfunctions caused by the power supply and
costs to install power supply filters are not covered
under the limited warranty. See
Heater Limited Warranty
5. These water heaters cannot be used in space heating
applications only.
(page 15).
(page 14)
Water Piping Diagrams
Water Piping
he flow rate should
Water Piping Diagrams
(page 69).
Water Piping Diagrams
(page 14).
Commercial Water
.
(page 76)
T&P VALVE DISCHARGE PIPE
This water heater is provided with a properly rated/sized and
certified combination temperature - pressure (T&P) relief valve
by the manufacturer. See
15) for information on replacement and other requirements.
CAUTION
Water Damage Hazard
•
Temperature-Pressure Relief Valve discharge
pipe must terminate at adequate drain.
Install a discharge pipe between the T&P valve discharge opening
and a suitable floor drain. Do not connect discharge piping directly
to the drain unless a six-inch (15.2 cm) air gap is provided. To
prevent bodily injury, hazard to life, or property damage, the relief
valve must be allowed to discharge water in adequate quantities
if circumstances demand. If the discharge pipe is not connected
to a drain or other suitable means, the water flow may cause
property damage.
T&P Valve Discharge Pipe Requirements
• Shall not be smaller in size than the outlet pipe size of the
valve, or have any reducing couplings or other restrictions.
• Shall not be plugged or blocked.
• Shall not be exposed to freezing temperatures.
• Shall be of material listed for hot water distribution.
• Shall be installed so as to allow complete drainage of both
the Temperature-Pressure Relief Valve and the discharge
pipe.
• Must terminate a maximum of six inches (15.2 cm) above
a floor drain or external to the building. In cold climates, it
is recommended that the discharge pipe be terminated at
an adequate drain inside the building.
• Shall not have any valve or other obstruction between the
relief valve and the drain.
43
Temperature-Pressure Relief Valve
Explosion Hazard
Temperature-Pressure Relief Valve
must comply with ANSI Z21.22-
CSA 4.4 and ASME code.
Properly sized temperature-
pressure relief valve must be
installed in opening provided.
Can result in overheating and
excessive tank pressure.
Can cause serious injury or death.
(page