A.O. Smith 197835-001 Manual

A SERVICE OF

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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.