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OPENING
LOLtATION
FIGURE 13
When ducts are used, they shall be of the same cross-
sectional area as the free area of the openings to which
they connect. The minimum short side dimension of
rectangular air ducts shall not be less than 3 inches (76.2
mm), see Figure 14.
OUTLET AIR DUCT
INLET AIR DUCT
Water Piping
Water temperature over 125°F
(52°C) can cause severe burns
instantly resulting in severe injury
or death.
Children, elderly, and the
physically or mentally disabled
are at highest riskfor scald injury.
Feel water before bathing or
showering.
Temperature limiting valves are
available.
Read instruction manual for safe
temperature setting.
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 infirm, or physically/mentally handicapped. If
anyone using hot water in your home fits 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 satisfies 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. Mixing valves are available at plumbing supply
or hardware stores, see Figure 15 below. Valves for
reducing point of use temperature by mixing cold and hot
water are also available. 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.
FIGURE 14.
Louvers and Grilles: In calculating free area, consideration
shall be given to the blocking effect of louvers, grilles or
screens protecting openings. Screens used shall not be
smaller than 1/4 inch (6.4 mm) mesh. If the free area
through a design of louver or grille is known, it should be
used in calculating the size opening required to provide
the free area specified. If the design and free area is not
known, it may be assumed that wood louvers will be 20-25
percent free area and metal louvers and grilles will have
60-75 percent free area. Louvers and grilles shall be fixed
in the open position or interlocked with the equipment so
that they are opened automatically during equipment
operation.
Special Conditions Created by Mechanical Exhausting or
Fireplaces: operation of exhaust fans, ventilation systems,
clothes dryers or fireplaces may create conditions
requiring special attention to avoid unsatisfactory
operation of installed gas utilization equipment.
12
HOT WATER COLD WATER
OUTLET { INLET
TEMPERED
WATER OUTLET
TO COLD WATER
LET ON
FROM WATER HEATER
*MIXING HOT WATER
VALVE OUTLET ON
WATER HEATER
FIGURE 15,
Toxic Chernical Hazard
•Do notconnectto non-potablewatersystem.
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