Unit installation

13
MULTIPLE HEATER MANIFOLD
Figure 9 and tables on pages 11 and 12 should be used for
horizontally manifolding two or more heaters. Also see
MULTIPLE-UNIT INSTALLATIONS of MECHANICAL VENTING
section for induced draft applications.
FIGURE 9
WATER LINE CONNECTIONS
This manual provides detailed installation diagrams (see pages
17 - 23 of this manual) for typical methods of application for the
water heaters.
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. When a circulating
pump is used it is important to note that the flow rate should be
slow so that there will be a minimum of turbulence inside the
heater.
If a water heater is installed in a closed water system, contact the
water supplier or local plumbing inspector on how to control this
situation.
WATER (POTABLE) HEATING AND SPACE
HEATING (See pages 17-23)
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 22 through 28 in back of
manual for suggested piping arrangements.
CAUTION
A closed system will exist if a check valve (without bypass),
pressure reducing valve (without bypass), or a water meter
(without bypass) is installed in the cold water line between the
water heater and street main (or well).
Excessive pressure may develop in such closed systems, causing
premature tank failure or intermittent relief valve operation.
This
is not a warranty failure. An expansion tank or a similar device
may be required in the inlet supply line between the appliance
and the meter or valve to compensate for the thermal expansion
of the water.
SYSTEM CONNECTIONS
The system installation must conform to these instructions and to
the local code authority having jurisdiction. Good practice requires
that all heavy piping be supported.
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.
RELIEF VALVE
This water heater is equipped with a combination temperature-
pressure relief valve that complies with the standard for relief
valves and automatic gas shutoff devices for hot water supply
system, ANSI Z21.22, for Canada see CAN/CSA 149.1 or.2. FOR
SAFE OPERATION OF THE WATER HEATER, THE RELIEF
VALVE(S) MUST NOT BE REMOVED OR PLUGGED.
ASME ratings cover pressure relief capacities. A.G.A. ratings cover
release rate with temperature actuation.
In addition to the appliance relief valve, each remote storage tank
which may be used in conjunction with this appliance shall also
be installed with a properly sized, rated and approved combination
temperature (ANSI) and pressure (ASME) relief valve(s).
WARNING
THE PURPOSE OF RELIEF VALVE IS TO AVOID EXCESSIVE
PRESSURE OR TEMPERATURE INTO THE STEAM RANGE,
WHICH MAY CAUSE SCALDING AT FIXTURES, TANK
EXPLOSION, SYSTEM OR HEATER DAMAGE. NO VALVE IS
TO BE PLACED BETWEEN THE RELIEF VALVE AND TANK.
Your local code authority may have other specific relief valve
requirements.
A DRAIN LINE MUST BE CONNECTED TO THE RELIEF VALVE
TO DIRECT DISCHARGE TO A SAFE LOCATION TO AVOID
SCALDING OR WATER DAMAGE. THIS LINE MUST NOT BE
REDUCED FROM THE SIZE OF THE VALVE OUTLET AND MUST
NOT CONTAIN VALVES, RESTRICTIONS NOR SHOULD IT BE
LOCATED IN FREEZING AREAS. DO NOT THREAD OR CAP
THE END OF THIS LINE. RESTRICTED OR BLOCKED
DISCHARGE WILL DEFEAT THE PURPOSE OF THE VALVE AND
IS UNSAFE. DISCHARGE LINE SHALL BE INSTALLED TO
ALLOW COMPLETE DRAINAGE OF BOTH THE VALVE AND
LINE.
See SERVICE INFORMATION section for procedure and
precautions.
GAS PIPING
Contact your local gas service company to ensure that adequate
gas service is available and to review applicable installation
codes for your area.