19
water heater installation
t&p ValVe disCharge pipe
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.
This water heater is provided with a properly rated/sized and
certified combination temperature - pressure (T&P) relief valve by
the manufacturer. See Temperature-Pressure relief Valve on pages
13-14 for information on replacement and other requirements.
Water Damage Hazard
Temperature-Pressure Relief Valve discharge
pipe must terminate at adequate drain.
•
CAUTION
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 6” (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 should 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 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.
water line ConneCtions
The water piping installation must conform to these instructions
and to all local 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. Water Temperature Control and Mixing Valves on page 12.
2. Dishwashing Machines on page 13.
3. Temperature-Pressure relief Valve on page 13.
4. Closed Systems and Thermal expansion on page 13.
5. For multiple water heater installations see Water Piping
Diagrams beginning on page 34.
water (potable) heating and space heating
1. All piping components connected to this unit for space
heating applications shall be suitable for use with potable
water.
2. Toxic chemicals, such as those used for boiler treatment,
shall neVer be introduced into this system.
3. This unit may neVer be connected to any existing heating
system or component(s) previously used with a non-potable
water heating appliance.
4. When the system requires water for space heating at
temperatures higher than required for domestic water
purposes, a tempering valve must be installed. Please
refer to installation diagrams beginning on page 34 of this
manual for suggested piping arrangements.
5. These water heaters cannot be used in space heating
applications only
thermometers (not supplied)
Thermometers should be obtained and field installed as shown
in the installation diagrams.
Thermometers are installed in the system as a means of
detecting the temperature of the outlet water supply.
water piping diagrams
This manual provides detailed water piping diagrams for typical
methods of application for the water heaters, see Water Piping
Diagrams beginning on page 34.
The water heater may be installed by itself, or with a separate
storage tank. When used with a separate storage tank, the
circulation may be either by gravity or by means of circulating
pump. 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 Water Piping Diagrams
beginning on page 34.
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.
