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11
THERMAL EXPANSION
As water is heated, it expands (thermal expansion). In a closed system
the volume of water will grow. As the volume of water grows there will be
a corresponding increase in water pressure due to thermal expansion.
Thermal expansion can cause premature tank failure (leakage). This type
of failure is not covered under the limited warranty. Thermal expansion
can also cause intermittent temperature-pressure relief valve operation:
water discharged from the valve due to excessive pressure build up. The
temperature-pressure relief valve is not intended for the constant relief
of thermal expansion. This condition is not covered under the limited
warranty.
A properly sized thermal expansion tank should be installed on all
closed systems to control the harmful effects of thermal expansion.
Contact a local plumbing service agency to have a thermal expansion
tank installed.
NOTE: To protect against untimely corrosion of hot and cold
water fi ttings, it is strongly recommended that di-electric unions
or couplings be installed on this water heater when connected to
copper pipe.
All gas piping must comply with local codes and ordinances or with the
National Fuel Gas Code (ANSI Z223.1/ NFPA-54) whichever applies.
Copper and brass tubing and fi ttings (except tin lined copper tubing) shall
not be used.
FIGURE 10.
WATER PIPING
HOTTER WATER CAN SCALD:
Water heaters are intended to produce hot water. Water heated to
a temperature which will satisfy space heating, clothes washing,
dish washing, cleaning and other sanitizing needs can scald and
permanently injure you upon contact. Some people are more likely
to be permanently injured by hot water than others. These include
the elderly, children, the infi rm, or physically/mentally handicapped.
If anyone using hot water in your home fi ts into one of these groups
or if there is a local code or state law requiring a certain temperature
water at the hot water tap, then you must take special precautions. In
addition to using the lowest possible temperature setting that satisfi es
your hot water needs, a means such as a *mixing valve, should be
used at the hot water taps used by these people or at the water heater,
see Figure 2. Valves for reducing point of use temperature by mixing
cold and hot water are also available:
Consult a Qualifi ed Installer or Service Agency. Follow manufacturer’s
instructions for installation of the valves. Before changing the factory
setting on the thermostat, read the “Temperature Regulation” section in
this manual.
This water heater shall not be connected to any heating systems or
component(s) used with a non-potable water heating appliance.
All piping components connected to this unit for space heating
applications shall be suitable for use with potable water.
Toxic chemicals, such as those used for boiler treatment shall not be
introduced into this system.
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 Figure 2 for suggested piping
arrangement.
CLOSED WATER SYSTEMS
Water supply systems may, because of code requirements or such
conditions as high line pressure, among others, have installed devices
such as pressure reducing valves, check valves, and back flow
preventers. Devices such as these cause the water system to be a
closed system.
INSTALLING THE NEW WATER HEATER