A.O. Smith 197835-001 Water Heater User Manual


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5. SecureassemblytoroofstructureasshowninFigureEusing
fieldsuppliedmetalstrappingorequivalentsupportmaterial.
NOTE: Ensure termination height is above the roof surface or
anticipated snow level (1 ft. in U.S.A. or 1-1/2 ft. in Canada) as
shown in Figure C.
6. Installraincapandsmalldiameterpipeassemblyin
roof penetration assembly, Ensure small diameter pipe
is cemented and bottomed in Y concentric fitting.
7. Cementwaterheatercombustionairintakeandventpipesto
concentric vent termination assembly. See Figure E for
properpipeattachment.
8. Operateheaterthrough1heatcycletoensurecombustionair
andventpipesareproperlyconnectedtoconcentricventtermination
connections.
NOTE: All vent terminations must be the same height when
installing multiple unit venting. If assembly is too short to meet
height requirement, the 2 pipes supplied in the kit may be replaced
by using same diameter, eld supplied SDR-26 PVC (D2241) pipe.
Do not extend the 21-1/8” dimension outer pipe to be more than
60 inches, see Figure B.
CAUTION
Do not use eld-supplied couplings to extend pipes. Airow
restriction will occur and the heater pressure switch may cause
intermittent operation.
PROCEDURE 2 SIDE WALL TERMINATION, see Figure F.
FIGURE F.
1.Determinebestlocationforterminationkit.
NOTE: Consideration for the followingshould be used when
determininganappropriatelocationfortheterminationkit:
• Terminationkit positionedwhere the ventvapors will
not damage plants/shrubs or air conditioning
equipment.
• Terminationkitpositioned so it willnotbe affected by
wind eddythat may allow recirculation of combustion
products,orairborneleaves,orlightsnow.
• Termination kitpositioned whereitwill notgetdamaged
or be subjected to foreign objects, such as stones,
balls, etc.
• Terminationkit positionedwhere the ventvapors will
notbeobjectionable.
NOTE: See the venting information (pages 16-20) in this
manual for additional vent location requirements.
2. Cut1hole(5in.diameter)
3. Partially assemble concentric vent termination kit.
a) Cement the Y concentric fitting to larger diameter
kitpipe,seeFigureA.
b) Cement the rain cap to the smaller diameter kit
pipe,seeFigureA.
NOTE: Instead of cementing the smaller pipe to the rain cap, a
eld-supplied stainless steel screw may be used to secure the
2 components together when eld disassembly is desired for
cleaning, see Figure D.
WARNING
When using alternate screw assembly method, drill clearance
hole in rain cap and pilot hole in vent pipe for screw being
used. Failure to drill adequate holes may cause cracking
of PVC components, allowing combustion products to be
recirculated. Failure to follow this warning could result in
personal injury or death.
WARNING
Do not operate the heater with rain cap removed or
recirculation of combustion products may occur. Water may
also collect inside larger combustion-air pipe and flow to the
burner enclosure. Failure to follow this warning could result
in product damage or improper operation, personal injury
or death.
4. InstallY concentric fitting and pipe assembly through
structure’shole.
NOTE: Do not allow insulation or other materials to accumulate
inside pipe assembly when installing through hole.
5. Install rain cap and small diameter pipe assembly in
Yconcentricfittingandlargepipeassembly.Ensure
smalldiameter pipe isbottomed and cementedin Y
concentrictting.
6. SecureassemblytostructureasshowninFigureGusingeld-
suppliedmetalstrappingorequivalentsupportmaterial.
NOTE: Ensure termination location clearance dimensions are as
shown in the diagrams found in Figure 15 A through D. When
extending the length of the 4” pipe, the added length beyond
21-1/8” must be deducted from the maximum equivalent feet of
vent pipe.
NOTE: If assembly needs to be extended to allow side
wall thickness requirement, the 2 pipes supplied in
the kit may be replaced by using same diameter, field-
supplied SDR-26 PVC (D2241) pipe. Do not extend
21 1/8” dimension more than 60 in. (See Figure B.)
CAUTION
Do not use eld-supplied couplings to extend pipes. Airow
restriction will occur and the heater pressure switch may cause
intermittent operation.
7. Cementheatercombustion-airandventpipestoconcentric
venttermination assembly. See Figure Gfor properpipe
attachment.
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