Kenmore 153.331761 Water Heater User Manual


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11
• Do not cover the instruction manual. Keep it on the side of
the water heater or nearby for future reference.
• Do obtain new warning and instruction labels from Sears for
placement on the blanket directly over the existing labels.
• Do inspect the insulation blanket frequently to make certain
itdoesnotsag,therebyobstructingcombustionairow.
Combustion Air and Ventilation for
AppliancesLocatedinUnconnedSpaces
UNCONFINED SPACE is space whose volume is not less than
50 cubic feet per 1,000 Btu per hour (4.8 m
3
per kW) of the
aggregate input rating of all appliances installed in that space.
Rooms communicating directly with the space in which the
appliances are installed, through openings not furnished with
doors,areconsideredapartoftheunconnedspace.
Inunconnedspacesinbuildings,inltrationmaybeadequate
toprovideairforcombustion,ventilationanddilutionofue
gases. However, in buildings of tight construction (for example,
weather stripping, heavily insulated, caulked, vapor barrier,
etc.), additional air may need to be provided using the methods
described in Combustion Air and Ventilation for Appliances
Located in Conned Spaces.
Combustion Air and Ventilation for
AppliancesLocatedinConnedSpaces
CONFINED SPACE is a space whose volume is less than
50 cubic feet per 1,000 Btu per hour (4.8 m
3
per kW) of the
aggregate input rating of all appliances installed in that space.
A.ALLAIRFROMINSIDEBUILDINGS:
(See Figure 9 and Figure 10)
The confined space should be provided with two permanent
openings communicating directly with an additional room(s)
of sufficient volume so that the combined volume of all
spaces meets the criteria for an unconfined space. The
total input of all gas utilization equipment installed in the
combined space should be considered in making this
determination. Each opening should have a minimum free
area of one square inch per 1,000 Btu per hour (22 cm
2
/
kW) of the total input rating of all gas utilization equipment
in the confined space, but not less than 100 square inches
(645 cm
2
). One opening should commence within 12 inches
(30 cm) of the top and one commencing within 12 inches (30
cm) of the bottom of the enclosures.
FIGURE 10.
B.ALLAIRFROMOUTDOORS: (See Figures 9, 11,12 and 13)
Theconnedspaceshouldbeprovidedwithtwopermanent
openings, one commencing within 12 inches (30 cm) of the top
and one commencing within 12 inches (30 cm) from the bottom
of the enclosure. The openings should communicate directly, or
by ducts, with the outdoors or spaces (crawl or attic) that freely
communicate with the outdoors.
FIGURE 11.
• Whendirectlycommunicatingwiththeoutdoors,eachopening
should have a minimum free area of 1 square inch per 4,000
Btu per hour (5.5 cm
2
/kW) of total input rating of all equipment
in the enclosure, see Figure 12.
FIGURE 12.
• Whencommunicatingwiththeoutdoorsthroughvertical
ducts, each opening should have a minimum free area of
1 square inch per 4,000 BTU per hour (5.5 cm
2
/kW) of
total input rating of all equipment in the enclosure, see
Figure 12 on page 11.
• Whencommunicatingwiththeoutdoorsthroughhorizontal
ducts, each opening should have a minimum free area
of 1 square inch per 2,000 BTU per hour (11 cm
2
/kW) of
total input rating of all equipment in the enclosure, see
Figure 14.
• Alternativelyasinglepermanentopeningmaybeusedwhen
communicating directly with the outdoors, or with spaces that
freely communicate with the outdoors. The opening should
have a minimum free area of 1 square inch per 3,000 BTU
per hour (8.3 cm
2
/kW) of total input rating of all equipment in
enclosure. See Figure 13.
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