19
water heater installation
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.
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. Closed Systems and Thermal Expansion on page 13.
4. Temperature-Pressure Relief Valve on page 13.
5. For multiple water heater installations see Water Piping
Diagrams beginning on page 34.
This manual provides detailed installation diagrams (see pages
34-48 of this manual) for typical methods of application for the
water heater(s).
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 on pages 34-48 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, on both single and two-temperature systems. When
used with a separate storage tank, the circulation may
be either by gravity or by means of a 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
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